CN115149666A - Wireless charging system, transmitter-side charging device and receiver-side charging device - Google Patents
Wireless charging system, transmitter-side charging device and receiver-side charging device Download PDFInfo
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- CN115149666A CN115149666A CN202110348392.0A CN202110348392A CN115149666A CN 115149666 A CN115149666 A CN 115149666A CN 202110348392 A CN202110348392 A CN 202110348392A CN 115149666 A CN115149666 A CN 115149666A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/90—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/90—Regulation of charging or discharging current or voltage
- H02J7/933—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J7/90—Regulation of charging or discharging current or voltage
- H02J7/96—Regulation of charging or discharging current or voltage in response to battery voltage
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明实施例提供一种无线充电系统、发射侧充电装置和接收侧充电装置。其中，无线充电系统包括：发射侧充电装置以及接收侧充电装置，其中，所述接收侧充电装置包括：第一无线接收电路，其包括第一接收线圈；第一整流器，其将所述第一无线接收电路中的第一交流电流整流为第一直流电流；第二无线接收电路，其包括第二接收线圈；第二整流器，其将所述第二无线接收电路中的第二交流电流整流为第二直流电流；以及接收侧控制器，其控制所述第一整流器和所述第二整流器中的至少一个，使得所述第一无线接收电路的第一交流电流和所述第二无线接收电路中的第二交流电流相等。由此，能够有效提升无线充电系统的效率。
Embodiments of the present invention provide a wireless charging system, a transmitting-side charging device, and a receiving-side charging device. The wireless charging system includes: a transmitting-side charging device and a receiving-side charging device, wherein the receiving-side charging device includes: a first wireless receiving circuit, which includes a first receiving coil; a first rectifier, which converts the first The first alternating current in the wireless receiving circuit is rectified into a first direct current; the second wireless receiving circuit includes a second receiving coil; the second rectifier rectifies the second alternating current in the second wireless receiving circuit as a second direct current; and a receiver-side controller that controls at least one of the first rectifier and the second rectifier so that the first alternating current of the first wireless receiving circuit and the second wireless receiving circuit The second alternating current in is equal. Thereby, the efficiency of the wireless charging system can be effectively improved.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a wireless charging system, a transmitting side charging device and a receiving side charging device.
Background
At present, wired power transmission is a charging technology which is widely applied. The wired electric energy transmission has the advantages of simplicity, economy, low loss, long transmission distance and the like. However, as technology develops, the disadvantages of conventional wired power transmission become more and more exposed, such as the need for wire connection, the tendency of wire joints to leak electricity, spark, arc erosion, etc., and poor flexibility of equipment.
Wireless power transfer (Wireless power transfer) is a novel power supply technology for realizing power transfer through soft media such as a magnetic field. The power transmission can be carried out without a lead, and the problems of abrasion, arc corrosion and the like caused by contact with a power supply are avoided. The flexibility and the safety of the power supply system are greatly improved. Has important application value and wide application prospect in the fields of industrial production, electric power, electronic products, military, aerospace, urban electrified transportation and the like.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
The inventors have found that, in the prior art, due to the inherent characteristics of the wireless charging system, when the positions of the receiving device and the transmitting device of the wireless charging system are shifted or the current on the receiving side of the wireless charging system is large, the charging efficiency is likely to be lowered, and large-scale popularization and use are difficult.
In order to solve at least one of the above problems or other similar problems, embodiments of the present invention provide a wireless charging system, a transmitting side charging device, and a receiving side charging device, which can reduce power consumption of the wireless charging system and effectively improve efficiency of the wireless charging system.
According to a first aspect of embodiments of the present invention, there is provided a wireless charging system, wherein the wireless charging system includes: a transmitting-side charging device and a receiving-side charging device, wherein the receiving-side charging device includes: a first wireless receiving circuit including a first receiving coil; a first rectifier that rectifies a first alternating current in the first wireless receiving circuit into a first direct current; a second wireless receiving circuit including a second receiving coil; a second rectifier that rectifies a second alternating current in the second wireless receiving circuit into a second direct current; and a receiving-side controller that controls at least one of the first rectifier and the second rectifier so that a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit are equal.
According to a second aspect of the embodiments of the present invention, there is provided a receiving-side charging device, wherein the receiving-side charging device includes: a first wireless receiving circuit including a first receiving coil; a first rectifier that rectifies a first alternating current in the first wireless receiving circuit into a first direct current; a second wireless receiving circuit including a second receiving coil; a second rectifier that rectifies a second alternating current in the second wireless receiving circuit into a second direct current; and a receiving-side controller that controls at least one of the first rectifier and the second rectifier so that a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit are equal.
According to a third aspect of embodiments of the present invention, there is provided a transmitting-side charging device, wherein the transmitting-side charging device includes: a direct current power supply; an inverter that converts a direct-current voltage output from the direct-current power supply into an alternating-current voltage; a wireless transmitting circuit including a transmitting coil, the wireless transmitting circuit supplying electric energy to a receiving-side charging device according to the alternating-current voltage output by the inverter; and a transmission-side controller that controls the alternating-current voltage output by the inverter according to a battery voltage and a battery current received from a reception-side charging device.
The embodiment of the invention has the advantages that the electric energy loss of the wireless charging system can be reduced and the efficiency of the wireless charging system can be effectively improved by adopting a double-receiving coil structure and carrying out balance control on the currents in the first wireless receiving circuit and the second wireless receiving circuit.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the terms "first," "second," and the like are used to distinguish one element from another by name, but do not denote a spatial arrangement, a temporal order, or the like, of the elements, and these elements should not be limited by these terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, or groups, but do not preclude the presence or addition of one or more other features, elements, components, or groups thereof.
In embodiments of the invention, the singular forms "a", "an", and the like include the plural forms and are to be construed broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "according at least in part to \8230;" based on "should be understood as" based at least in part on \8230; "unless the context clearly indicates otherwise.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic view of a wireless charging system according to embodiment 1 of the present invention;
fig. 2 is a schematic view of the charging mode of embodiment 1 of the present invention;
fig. 3A is a schematic diagram of a transmitting coil, a first receiving coil and a second receiving coil of embodiment 1 of the present invention;
fig. 3B is another schematic diagram of the transmission coil, the first reception coil, and the second reception coil of embodiment 1 of the present invention;
fig. 3C is another schematic diagram of the transmitting coil, the first receiving coil and the second receiving coil of embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a circuit of a wireless charging system according to embodiment 1 of the present invention;
fig. 5 is a schematic view of the current balance control of embodiment 1 of the present invention;
fig. 6 is a schematic diagram of synchronous symmetric phase shift control of an inverter according to embodiment 1 of the present invention.
Detailed Description
The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.
Example 1
The embodiment 1 of the invention provides a wireless charging system. Fig. 1 is a schematic diagram of a wireless charging system 1 according to embodiment 1 of the present invention. As shown in fig. 1, the wireless charging system 1 includes: a transmitting-side charging device 11 and a receiving-side charging device 12.
Wherein the receiving-side charging device 12 includes: a first wireless receiving circuit 121 including a first receiving coil 1211; a first rectifier 122 that rectifies the first alternating current in the first wireless receiving circuit 121 into a first direct current; a second wireless receiving circuit 123 including a second receiving coil 1231; a second rectifier 124 that rectifies the second alternating current in the second wireless receiving circuit 123 into a second direct current; and a reception-side controller 125 that controls at least one of the first rectifier 122 and the second rectifier 124 so that the first alternating current of the first wireless reception circuit 121 and the second alternating current of the second wireless reception circuit 123 are equal.
Through the above embodiment, by adopting a dual receiving coil structure formed by the first receiving coil 1211 and the second receiving coil 1231 and performing equalization control on the currents in the first wireless receiving circuit 121 and the second wireless receiving circuit 123, the power consumption of the wireless charging system can be reduced, and the efficiency of the wireless charging system 1 can be effectively improved.
In one or more embodiments, the wireless charging system 1 may be used for wireless charging in various fields.
For example, the wireless charging system 1 is used in the field of Automated production, in which the receiving-side charging device 12 may be provided on an Automated Guided Vehicle (AGV). Thus, the wireless charging system 1 can keep charging the AGV battery or charge the AGV battery for a certain time without a charging station. The AGV is charged through the wireless charging system, the size of the charging battery is not required to be increased, the number of charging interfaces is not required to be increased, and the charging process can be conveniently completed. In addition, compared with a wired charging system, the wireless charging system 1 has no metal contact, so that electric shock and other phenomena in the charging process can be avoided, and the requirements of industrial application on safety, service life, electrical isolation, reduction of load of an operator during charging and the like can be met.
In one or more embodiments, the first alternating current of the first wireless receiving circuit 121 and the second alternating current of the second wireless receiving circuit 123 being equal may be that the first alternating current and the second alternating current are completely equal, or the first alternating current and the second alternating current are substantially equal, for example, an absolute value of a difference between the first alternating current and the second alternating current is less than a prescribed value.
In one or more embodiments, the transmitting-side charging device in the wireless charging system 1 may have an existing structure, or may have a structure specific to an embodiment of the present invention. Hereinafter, a conventional configuration of a transmitting-side charging device will be described as an example.
For example, as shown in fig. 1, the transmitting-side charging device 1 may include: direct current power supply 111, inverter 112, wireless transmitting circuit 113. The inverter 112 converts a dc voltage output from the dc power supply 111 into an ac voltage. The wireless transmission circuit 113 includes a transmission coil 1131, and the wireless transmission circuit 113 supplies electric power to the receiving-side charging device 12 in accordance with the alternating-current voltage output by the inverter 112.
In one or more embodiments, the first alternating current of the first wireless receiving circuit 121 may be an alternating current generated by electromagnetic induction between the first receiving coil 1211 and the transmitting coil 1131 in the transmitting-side charging device 11, and the second alternating current of the second wireless receiving circuit 123 may be an alternating current generated by electromagnetic induction between the second receiving coil 1231 and the transmitting coil 1131 in the transmitting-side charging device 11.
In one or more embodiments, the receiving-side controller 125 makes the first alternating current of the first wireless receiving circuit 121 and the second alternating current of the second wireless receiving circuit 123 equal by controlling the driving signal of at least one of the first rectifier 122 and the second rectifier 124.
In one or more embodiments, in order to equalize the first alternating current of the first wireless receiving circuit 121 and the second alternating current of the second wireless receiving circuit 123, the receiving-side controller 125 may control the driving signal of the first rectifier 121 or the second rectifier 124 connected to the one of the first receiving coil 1211 and the second receiving coil 1231, which has the smaller mutual inductance. Here, the mutual inductance of the first receiving coil 1211 may be electromagnetic induction between the first receiving coil 1211 and the transmitting coil 1131 in the transmitting-side charging device 11, and the mutual inductance of the second receiving coil 1231 may be electromagnetic induction between the second receiving coil 1231 and the transmitting coil 1131 in the transmitting-side charging device 11.
In one or more embodiments, the magnitude of the mutual inductance may be measured by the magnitude of the alternating current due to electromagnetic induction. For example, assuming that the first alternating current of the first wireless receiving circuit 121 is smaller than the second alternating current in the second wireless receiving circuit 123, which indicates that the mutual inductance of the first receiving coil 1211 is small, the receiving-side controller 125 controls the driving signal of the first rectifier 122 connected to the first wireless receiving circuit 121.
In an actual charging process, in a case where the positions of the first receiver coil 1211 and the second receiver coil 1231 are shifted with respect to the transmitter coil 1131, the mutual inductances of the first receiver coil 1211 and the second receiver coil 1231 may not be equal. When the mutual inductances of the first receiver coil 1211 and the second receiver coil 1231 are not equal to each other, the ac current in the receiver coil having a small mutual inductance can be increased by adjusting the driving signal of the rectifier corresponding to the receiver coil having a small mutual inductance, so that the first ac current of the first wireless receiver circuit 121 and the second ac current of the second wireless receiver circuit 123 are equal to each other.
In one or more embodiments, the receiving-side controller 125 may equalize the first alternating current of the first wireless receiving circuit 121 and the second alternating current of the second wireless receiving circuit 123 by adjusting the phases of the driving pulses of the positive and negative half cycles of the first rectifier 121 or the second rectifier 124 to which one of the first receiving coil 1211 and the second receiving coil 1231, which has the smaller mutual inductance, is connected. For example, the receiving-side controller 125 may control the driving signals of the first rectifier 121 or the second rectifier 124 in a synchronous symmetrical phase shift manner. However, the present application is not limited thereto, and the driving signal of the first rectifier 121 or the second rectifier 124 may be controlled in other manners.
In one or more embodiments, as shown in fig. 1, the receiving-side charging device 12 may further include a rechargeable battery 126. The rechargeable battery 126 may be any type of rechargeable battery, and for example, in the case where the receiving-side charging device 12 is applied to an AGV, the rechargeable battery 126 may be an on-board battery that supplies power to the AGV.
In one or more embodiments, the receiving-side controller 125 may detect a battery voltage and a battery current of the rechargeable battery 126, and further, the receiving-side controller 125 may detect a first alternating current of the first wireless receiving circuit 121 and a second alternating current of the second wireless receiving circuit 123. The receiving-side controller 125 may detect the battery voltage and the battery current and the first ac current and the second ac current by various methods, which is not particularly limited in the present invention.
In one or more embodiments, the transmitting-side charging device 1 may also adopt a unique structure different from the existing structure, and as shown in fig. 1, the transmitting-side charging device 1 may further include a transmitting-side controller 114 that controls the alternating-current voltage output by the inverter 112 according to the battery voltage and the battery current received from the receiving-side charging device 12.
For example, the receiving-side controller 125 may transmit the battery voltage and the battery current of the rechargeable battery 126 to the transmitting-side controller 114, so that the transmitting-side controller 114 controls the inverter 112 according to the battery voltage and the battery current. Therefore, under the condition that a double-side DC-DC converter is not adopted, the output voltage of the system can be ensured to be constant under the condition that large deviation occurs between the receiving coil and the transmitting coil, and the installation volume and complexity of the system are reduced.
In one or more embodiments, the receiving-side controller 125 may transmit the battery voltage and the battery current to the receiving-side controller 114 through any wireless communication means, for example, through a cellular communication network, wiFi (IEEE 802.11 protocol), bluetooth, zigBee, infrared, NFC, UWB, or the like.
In one or more embodiments, the transmission-side controller 114 may control the driving signal of the inverter 112 according to the battery voltage and the battery current. For example, the transmitting-side controller 114 may control the driving signal in a synchronous symmetrical phase shift manner according to the battery voltage and the battery current, so as to adjust the equivalent ac voltage output by the inverter 112 to meet the charging requirement.
In one or more embodiments, the transmitting-side controller 114 may select a parameter according to the comparison result of the battery voltage and the battery current with the set value and calculate a target phase shift angle of the inverter 112 according to the selected parameter, and generate a driving signal of the inverter 112 according to the target phase shift angle. For example, the transmitting-side controller 114 compares the battery voltage and the battery current with set values, selects parameters according to the comparison result, calculates a target phase shift angle of the inverter 112 in the transmitting-side charging device 11 based on a PID control algorithm according to the selected parameters, and generates a PWM signal according to the target phase shift angle to drive the inverter to operate.
Fig. 2 is a schematic diagram of the charging mode in embodiment 1 of the present invention. The manner in which the target phase shift angle is calculated is illustrated below in conjunction with fig. 2. As shown in fig. 2, the rechargeable battery 126 can have two charging modes, i.e., a constant voltage charging mode and a constant current charging mode. In the low battery condition, the equivalent load of the rechargeable battery 126 is small, and the rechargeable battery is in the constant current charging mode, in this case, the battery current I out Are parameters. Assuming rated output current as I ref (design time I) ref ≤I out ) Then, the inverter 112 output voltage pulse width α satisfies the following relation: sin (α/2) = I ref /I out I.e. α =2arcsin (I) ref /I out ). The target phase shift angle is (pi-alpha)/2, i.e., [ pi-2 arcsin (I) ref /I out )]/2. As the battery equivalent load increases, the rechargeable battery 126 is placed in a constant voltage charging mode, in this case at a charging voltage U out Are parameters. Assuming a nominal output voltage of U ref (As the load becomes larger, U out Will be greater than U ref ) Then, the inverter 112 output voltage pulse width α satisfies the following relation: sin (alpha/2) = U ref /U out I.e. α =2arcsin (U) ref /U out ). The target phase shift angle is (pi-alpha)/2, i.e., [ pi-2 arcsin (U) ref /U out )]/2。
However, the present invention is not limited to this, and the target phase shift angle may be calculated in another manner to generate the driving signal of the inverter 112.
In one or more embodiments, the transmitting-side controller 114 may adjust a pulse width of the ac voltage output from the inverter 112 by controlling a driving signal of the inverter 112, thereby enabling control of the ac voltage output from the inverter 112.
In one or more embodiments, the transmit side controller 114 may determine the charging mode based on a comparison of the battery voltage and the battery current to set values. For example, the rated output voltage U may be set ref As a set value, according to the battery voltage U out And rated output voltage U ref Determines a charging mode at a constant voltage or a constant current. Specifically, at battery voltage U out Not reaching the rated output voltage U ref In the case of (1), that is, in the case of low battery, the equivalent load of the rechargeable battery 126 is small, and the rechargeable battery is in the constant-current charging mode; as the electric quantity increases, the equivalent resistance rises, when the battery voltage U out Reach rated output voltage U ref In this case, the secondary battery 126 is in the constant voltage charging mode.
Fig. 3A is a schematic diagram of the transmission coil 1131, the first receiving coil 1211 and the second receiving coil 1231 of embodiment 1 of the present invention, fig. 3B is another schematic diagram of the transmission coil 1131, the first receiving coil 1211 and the second receiving coil 1231 of embodiment 1 of the present invention, and fig. 3C is another schematic diagram of the transmission coil 1131, the first receiving coil 1211 and the second receiving coil 1231 of embodiment 1 of the present invention.
In one or more embodiments, as shown in fig. 3A to 3B, the first and second receiving coils 1211 and 1231 may have the same structure and be partially overlapped. For example, the first receiver coil 1211 and the second receiver coil 1231 may be two D coils having the same polarity, and the first receiver coil 1211 and the second receiver coil 1231 may be placed in an overlapping manner, and the overlapping area is adjusted so that the magnetic fields that pass in and out are equal to each other, whereby the first receiver coil 1211 and the second receiver coil 1231 are not cross-coupled to each other, thereby achieving decoupling.
In one or more embodiments, as shown in fig. 3A-3B, the first and second receive coils 1211 and 1231 may be disposed partially overlapping the transmit coil 1131.
In one or more embodiments, as shown in fig. 3C, a first ferrite core 1132 may be disposed on a side of the transmitting coil 1131 away from the first receiving coil 1211 and the second receiving coil 1231, and a second ferrite core 1212 may be disposed on a side of the first receiving coil 1211 and the second receiving coil 1231 away from the transmitting coil 1131.
In one or more embodiments, the first and second receive coils 1211 and 1231 may be a decoupled BP dual coil structure. Thus, interference between the first receiving coil 1211 and the second receiving coil 1231 due to mutual coupling can be reduced, and the efficiency of the wireless charging system 1 can be improved.
Fig. 4 is a schematic diagram of a circuit of the wireless charging system 1 according to embodiment 1 of the present invention. Next, a circuit configuration of the wireless charging system 1 will be exemplarily described with reference to fig. 4 as an example.
In one or more embodiments, as shown in fig. 4, on the receiving-side charging device 12 side, the first wireless receiving circuit 121 may include a receiving coil L S1 (first receiving coil 1211) and receiving compensation capacitor C S1 (ii) a The second wireless receiving circuit 123 may include a receiving coil L S2 (second receiving coil 1231), reception compensation capacitor C S2 。
The first rectifier 122 may include four MOSFETs, respectively MOSFET P 5 ，MOSFET P 6 ，MOSFET P 7 And MOSFET P 8 (ii) a The second rectifier 124 may include four MOSFETs, respectively MOSFET P 9 ，MOSFET P 10 ，MOSFET P 11 And MOSFET P 12 。
In addition, at the receiving side charging deviceOn side 12, C L Is a voltage stabilizing capacitor, R, after the first rectifier 122 and the second rectifier 124 L Is a DC load resistor, R S1 And R S2 Equivalent resistances, I, of the first wireless receiving circuit 121 and the second wireless receiving circuit 123, respectively S1 And I S2 A first alternating current and a second alternating current, U, of the first wireless receiving circuit 121 and the second wireless receiving circuit 123, respectively out And I out Respectively, the battery voltage and the battery current.
In one or more embodiments, as shown in fig. 4, on the transmitting-side charging device 11 side, the wireless transmitting circuit 113 may include a transmitting coil L P (transmitting coil 1131), and a transmission compensation capacitor C p . The inverter 112 may include four MOSFETs, respectively MOSFETs P 1 ，MOSFET P 2 ，MOSFET P 3 And MOSFET P 4 。
Further, on the transmitting-side charging device 11 side, U dc For a DC power supply (DC power supply 111) with a constant output voltage, I dc Is the output current of the DC power supply, U in Is the equivalent alternating voltage after inversion, I P Is an alternating current in the wireless transmission circuit 113.
As shown in FIG. 4, M PS1 Represents a transmitting coil L P And a receiving coil L S1 Mutual inductance between them, M PS2 Represents a transmitting coil L P And a receiving coil L S2 Mutual inductance between them.
In the case where the circuit of the wireless charging system 1 operates in the resonance state, the following formula is satisfied:
where ω is the operating frequency of the inverter circuit (inverter 112). According to fundamental wave analysis, the circuit model satisfies the following relation:
the wireless transmitting circuit 113 has a high voltage and a small current, and the line loss and the switching loss are negligible compared to the low voltage and the large current of the first wireless receiving circuit 121 and the second wireless receiving circuit 123. Suppose that:
wherein β is the first alternating current I of the first wireless receiving circuit 121 S1 And the battery current I out The ratio of (a) to (b). In the case where the first and second receiving coils 1211 and 1231 adopt the BP structure (as shown in fig. 3A to 3C), since both the first and second receiving coils 1211 and 1231 completely coincide, it can be considered that R is identical S1 ＝R S2 ＝R S Then, the loss of the first wireless receiving circuit 121 and the second wireless receiving circuit 123 can be expressed as:
by making the derivative of equation 4 above with respect to β zero, the value for β at which the lowest available loss is:
in this case, the first alternating current I of the first wireless receiving circuit 121 S1 A second alternating current I of the second wireless receiving circuit 123 S2 And the loss P of the first radio receiving circuit 121 and the second radio receiving circuit 123 loss_min Respectively as follows:
that is, the first alternating current I in the first wireless receiving circuit 121 S1 A second alternating current I of the second wireless receiving circuit 123 S2 Equal time, noneThe efficiency of the line charging system 1 is optimal. For a wireless charging system with the same internal resistance and the same output single coil structure, the loss is as follows:
from this, it is understood that the wireless receiving circuit loss of the wireless charging system 1 employing the dual receiving coil structure (the first receiving coil 1211 and the second receiving coil 1231) is reduced by half. Therefore, the efficiency of the wireless charging system 1 can be effectively improved by adopting a dual-receiving-coil structure and performing current balance control.
Fig. 5 is a schematic diagram of the current balance control according to embodiment 1 of the present invention, in which drive signal #5, drive signal #6, drive signal #7, and drive signal #8 are MOSFETs P in first rectifier 122, respectively 5 ，MOSFET P 6 ，MOSFET P 7 And MOSFET P 8 The drive signal of (1). The left diagram of fig. 5 shows the first alternating current I before the current balance control S1 A second alternating current I S2 And a drive signal for the first rectifier 122, as shown in the figure, before the current equalization control, the drive signal #5, the drive signal #6, the drive signal #7, and the drive signal #8 drive the first rectifier 122 in a synchronous rectification manner, and the first alternating current I S1 Less than the second alternating current I S2 . The right-hand diagram of fig. 5 shows the first alternating current I after the current equalization control S1 A second alternating current I S2 And the driving signal of the first rectifier 122, as shown in the figure, the phases of the driving signal # 1, the driving signal # 2, the driving signal #3 and the driving signal #4 of the first rectifier 121 are adjusted by a synchronous symmetrical phase shift manner after the current balance control so that the first alternating current I S1 Is equal to the second alternating current I S2 。
In one or more embodiments, since the dual receive coils (the first receive coil 1211 and the second receive coil 1231) employ a BP coil structure, the first receive coil 1211 and the second receive coil 1231 are decoupled from each other. According to kirchhoff's voltage law, the steady-state description equation of the system is as follows:
in the formula, R ac1 、R ac2 Is an alternating current equivalent load in the receiving circuit. Since the current balance control is adopted to keep the currents in the first receiver coil 1211 and the second receiver coil 1231 equal all the time, by controlling the equivalent load in the receiver circuit with smaller mutual inductance, R is satisfied ac1 /R ac2 ＝M PS1 /M PS2 Then voltage current I out Can be expressed as:
in order to maintain battery current I out The inverter 112 may adjust the ac voltage U by using a symmetrical phase shift method in . Suppose an AC voltage U in Has a pulse width of alpha, the alternating voltage U in Can be described as:
the battery current I out The expression of (a) is:
that is, by adjusting the AC voltage U in Can achieve the regulation of the battery current I out The purpose of (1). Therefore, under the condition that the deviation occurs between the receiving coil and the transmitting coil, the battery voltage and the battery power supply provided by the wireless charging system 1 for the rechargeable battery can be ensured to be stable, a bilateral DC-DC converter does not need to be arranged in the wireless charging system 1, and the installation volume and complexity of the system are reduced.
FIG. 6 is a pair inverter of embodiment 1 of the present invention112, drive signal # 1, drive signal # 2, drive signal #3, and drive signal #4 are each a MOSFET P in inverter 112 1 ，MOSFET P 2 ，MOSFET P 3 And MOSFET P 4 The drive signal of (1). The left diagram of fig. 6 shows the ac voltage U before the synchronous symmetrical phase shift control of the inverter 112 in Driving signal of inverter 112, battery voltage U out And battery current I out . As shown in the figure, the AC voltage U is based on the driving signal # 1, the driving signal # 2, the driving signal #3 and the driving signal #4 shown in the figure in Has a pulse width alpha of 40, corresponding to a battery voltage U out Is 17.21V, and the battery current I out It was 7.47A.
The right-hand diagram of fig. 6 shows the ac voltage U after synchronous symmetrical phase shift control of the inverter 112 in Driving signal of inverter 112, battery voltage U out And battery current I out . As shown in the figure, after synchronous symmetrical phase shift control of inverter 112, phases of drive signal # 1, drive signal # 2, drive signal #3, and drive signal #4 of first rectifier 121 are adjusted, and ac voltage U is adjusted in Has a pulse width alpha of 180 and the corresponding battery voltage U out 52.25V, battery current I out It was 22.68A. I.e. after synchronous symmetrical phase shift control, the alternating voltage U is made in Becomes larger, the battery voltage U of the wireless charging receiving side out And battery current I out And correspondingly increased.
Through the embodiment, the double-receiving coil structure is adopted, and the current in the first wireless receiving circuit and the second wireless receiving circuit is subjected to balance control, so that the electric energy loss of the wireless charging system can be reduced, and the efficiency of the wireless charging system is effectively improved.
Example 2
In one or more embodiments, the receiving-side charging device includes: a first wireless receiving circuit including a first receiving coil; a first rectifier which rectifies a first alternating current in the first wireless receiving circuit into a first direct current; a second wireless receiving circuit including a second receiving coil; a second rectifier that rectifies a second alternating current in the second wireless receiving circuit into a second direct current; and a receiving-side controller that controls at least one of the first rectifier and the second rectifier so that the first alternating current in the first wireless receiving circuit and the second alternating current in the second wireless receiving circuit are equal.
Through the embodiment, the efficiency of the wireless charging system can be effectively improved by adopting a double-receiving-coil structure and carrying out balance control on the currents in the first wireless receiving circuit and the second wireless receiving circuit.
In one or more embodiments, the receiving-side controller equalizes a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit by controlling a driving signal of at least one of the first rectifier and the second rectifier.
In one or more embodiments, the receiving-side controller equalizes the first alternating current in the first wireless receiving circuit and the second alternating current in the second wireless receiving circuit by adjusting the phases of the drive pulses of the positive and negative half cycles of the first rectifier or the second rectifier to which one of the first receiving coil and the second receiving coil, which has the smaller mutual inductance, is connected.
In one or more embodiments, the receiving-side charging device further includes a rechargeable battery.
In one or more embodiments, the receiving-side controller transmits the battery voltage and the battery current of the rechargeable battery to the transmitting-side controller, so that the transmitting-side controller controls the inverter according to the battery voltage and the battery current.
In one or more embodiments, the first and second receiving coils have the same structure and are disposed partially overlapping.
In one or more embodiments, the first receive coil and the second receive coil are decoupled BP dual coil structures.
Through the embodiment, the double-receiving coil structure is adopted, and the current in the first wireless receiving circuit and the current in the second wireless receiving circuit are subjected to balance control, so that the electric energy loss of the wireless charging system can be reduced, and the efficiency of the wireless charging system is effectively improved.
Example 3
Embodiment 3 of the present invention provides a transmitting-side charging device. The structure and function of the transmitting-side charging device may be the same as those of the transmitting-side charging device 11 of the wireless charging system 1 of embodiment 1, and the contents thereof are incorporated herein and will not be described again.
In one or more embodiments, the transmitting-side charging device may include: a direct current power supply; an inverter that converts a direct-current voltage output from a direct-current power supply into an alternating-current voltage; a wireless transmitting circuit including a transmitting coil, the wireless transmitting circuit supplying electric energy to the receiving-side charging device according to the alternating-current voltage output by the inverter; and a transmitting-side controller that controls the alternating-current voltage output by the inverter according to the battery voltage and the battery current received from the receiving-side charging device.
In one or more embodiments, the transmission-side controller controls the driving signal of the inverter according to the battery voltage and the battery current.
In one or more embodiments, the transmitting-side controller adjusts a pulse width of the ac voltage output from the inverter by controlling a driving signal of the inverter.
In one or more embodiments, the transmitting-side controller selects a parameter according to a comparison result of the battery voltage and the battery current with a set value and calculates a target phase shift angle of the inverter according to the selected parameter, and generates a driving signal of the inverter according to the target phase shift angle.
In one or more embodiments, the transmission-side controller determines the charging mode according to the comparison result of the battery voltage and the battery current with the set value.
Through the embodiment, the alternating voltage output by the inverter is controlled according to the battery voltage and the battery current, so that the output voltage of the system can be ensured to be constant under the condition that a large deviation occurs between the receiving coil and the transmitting coil under the condition that a double-side DC-DC converter is not adopted, and the installation volume and complexity of the system are reduced.
The above devices and systems of the present invention can be realized by hardware, and can also be realized by hardware and software. The present invention relates to a computer-readable program which, when executed by a logic section, enables the logic section to realize the above-described apparatus or constituent section, or to realize the above-described various methods or steps. The present invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
The apparatus/system described in connection with the embodiments of the invention may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. For example, one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in fig. 1 may correspond to individual software modules of a computer program flow, or may correspond to individual hardware modules. These hardware modules may be implemented, for example, using Field Programmable Gate Arrays (FPGAs) to consolidate the software modules.
A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium; or the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The software module may be stored in the memory of the mobile terminal or in a memory card that is insertable into the mobile terminal. For example, if the information processing apparatus employs a MEGA-SIM card having a relatively large capacity or a flash memory device having a large capacity, the software module may be stored in the MEGA-SIM card or the flash memory device having a large capacity.
One or more of the functional blocks and/or one or more combinations of the functional blocks described in the figures may be implemented as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof designed to perform the functions described herein. One or more of the functional blocks and/or one or more combinations of the functional blocks described in connection with the figures may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP communication, or any other such configuration.
While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and adaptations of the present invention will become apparent to those skilled in the art in view of the teachings herein, and such modifications and adaptations are intended to be within the scope of the present invention.
Claims (12)
1. A wireless charging system, comprising:
a transmitting-side charging device and a receiving-side charging device,
wherein the receiving-side charging device includes:
a first wireless receiving circuit including a first receiving coil;
a first rectifier that rectifies a first alternating current in the first wireless receiving circuit into a first direct current;
a second wireless receiving circuit including a second receiving coil;
a second rectifier that rectifies a second alternating current in the second wireless receiving circuit into a second direct current; and
a receiving-side controller that controls at least one of the first rectifier and the second rectifier so that a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit are equal.
2. The wireless charging system of claim 1,
the receiving-side controller equalizes a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit by controlling a drive signal of at least one of the first rectifier and the second rectifier.
3. The wireless charging system of claim 2,
the receiving-side controller equalizes a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit by adjusting the phases of the drive pulses of the positive and negative half cycles of the first rectifier or the second rectifier to which one of the first receiving coil and the second receiving coil, which has a smaller mutual inductance, is connected.
4. The wireless charging system of claim 1,
the receiving-side charging device further includes a rechargeable battery,
the transmitting-side charging device includes:
a direct current power supply;
an inverter that converts a direct-current voltage output from the direct-current power supply into an alternating-current voltage;
a wireless transmitting circuit including a transmitting coil, the wireless transmitting circuit supplying electric energy to the receiving-side charging device in accordance with the alternating-current voltage output by the inverter; and
a transmitting-side controller that controls the alternating-current voltage output by the inverter,
and the receiving side controller sends the battery voltage and the battery current of the rechargeable battery to the transmitting side controller, so that the transmitting side controller controls the inverter according to the battery voltage and the battery current.
5. The wireless charging system of claim 4,
and the transmitting side controller controls a driving signal of the inverter according to the battery voltage and the battery current.
6. The wireless charging system of claim 5,
the transmitting side controller adjusts the pulse width of the alternating voltage output by the inverter by controlling a driving signal of the inverter.
7. The wireless charging system of claim 5,
and the transmitting side controller selects parameters according to the comparison result of the battery voltage and the battery current with a set value, calculates a target phase shift angle of the inverter according to the selected parameters, and generates a driving signal of the inverter according to the target phase shift angle.
8. The wireless charging system of claim 5,
and the transmitting side controller determines a charging mode according to the comparison result of the battery voltage and the battery current with a set value.
9. The wireless charging system of claim 1,
the first receiving coil and the second receiving coil have the same structure and are partially overlapped.
10. The wireless charging system according to claim 1 or 9,
the first receive coil and the second receive coil are a decoupled BP dual coil structure.
11. A receiving-side charging device characterized by comprising:
a first wireless receiving circuit including a first receiving coil;
a first rectifier that rectifies a first alternating current in the first wireless receiving circuit into a first direct current;
a second wireless receiving circuit including a second receiving coil;
a second rectifier that rectifies a second alternating current in the second wireless receiving circuit into a second direct current; and
a receiving-side controller that controls at least one of the first rectifier and the second rectifier so that a first alternating current in the first wireless receiving circuit and a second alternating current in the second wireless receiving circuit are equal.
12. A transmitting-side charging device characterized by comprising:
a direct current power supply;
an inverter that converts a direct-current voltage output from the direct-current power supply into an alternating-current voltage;
a wireless transmitting circuit including a transmitting coil, the wireless transmitting circuit supplying electric energy to a receiving-side charging device according to the alternating-current voltage output by the inverter; and
a transmission-side controller that controls the alternating-current voltage output by the inverter according to a battery voltage and a battery current received from a reception-side charging device.
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| CN202110348392.0A CN115149666A (en) | 2021-03-31 | 2021-03-31 | Wireless charging system, transmitter-side charging device and receiver-side charging device |
| JP2022032550A JP2022158970A (en) | 2021-03-31 | 2022-03-03 | Wireless charging system, transmission side charging device and reception side charging device |
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| EP2712053A4 (en) * | 2011-06-14 | 2014-11-05 | Panasonic Corp | COMMUNICATION APPARATUS |
| JP6376201B2 (en) * | 2013-04-08 | 2018-08-22 | ソニー株式会社 | Contactless power supply method |
| CN110422061B (en) * | 2019-07-18 | 2020-11-17 | 华中科技大学 | Wireless bidirectional electric energy conversion topology and control method thereof |
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| WO2015141554A1 (en) * | 2014-03-18 | 2015-09-24 | 株式会社Ihi | Power supply device and non-contact power supply system |
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