CN102118114A - Power supply device and power control method thereof - Google Patents

Abstract

The invention discloses a power supply device and a power control method thereof. The power supply device comprises a rectification circuit, a voltage conversion circuit, a processing module and a feedback compensation circuit. The rectifying circuit can receive an alternating current voltage signal with a variable voltage value input from the power supply input end and rectify the alternating current voltage signal into a first direct current voltage signal. The voltage conversion circuit is connected with the rectification circuit to convert the first direct-current voltage signal into a second direct-current voltage signal. The processing module is connected between the voltage conversion circuit and an output end to output the second voltage signal to the output end. When the output end is not connected with the load, the processing module can output a control signal to the feedback compensation circuit, so that the feedback compensation circuit controls the voltage conversion circuit to stop the conversion action, thereby achieving the effect of energy saving.

Description

Power supply device and power control method thereof

technical field

The invention relates to a power supply device and its power control method, in particular to a power supply device with energy-saving function and its power control method.

Background technique

Most electronic equipment such as televisions, stereos, computers, etc., use direct current as the power source for internal components. Except for relatively light and simple electronic equipment that uses dry batteries, most electronic devices must use power supplies or transformers to convert the power supply to the market. After the AC power provided by the power supply is converted into DC power, it undergoes steps such as filtering and voltage conversion to generate a stable DC voltage for use by electronic devices.

As shown in FIG. 1 , it is a block diagram of a power supply device in the prior art. In this figure, the current power supply device includes a bridge rectifier 12 , a step-down filter 13 and a feedback circuit 14 . The bridge rectifier 12 receives the AC power input from the AC input terminal 11 for AC to DC (AC to DC) conversion, and the step-down filter 13 steps down the converted DC power, and transmits the reduced voltage The DC power is output to the output terminal 15, and the feedback circuit 14 adjusts the step-down filter 13 according to the voltage value of the output terminal 15, so that the step-down filter 13 outputs a stable DC voltage. As shown in Figure 2.

However, when the output terminal is not connected to the load and complies with the latest Energy Star 5.0Level V specification, it still consumes 0.5 watts (Walt, W). As time accumulates for a long time, it will add up and cause energy loss that cannot be ignored. Therefore, regardless of the use efficiency of electronic equipment itself and the limited standpoint of caring for the earth, the loss of energy is an urgent problem to be solved.

Contents of the invention

In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a power supply device and a power control method thereof, so as to solve the problem of unnecessary dissipation of electric energy when there is no load.

According to the purpose of the present invention, a power supply device is proposed, which includes a rectification circuit, a voltage conversion circuit, a processing module and a feedback compensation circuit. The rectification circuit receives an AC voltage signal with a variable voltage value input from a power supply input terminal, and rectifies the AC voltage signal into a first DC voltage signal. The voltage converting circuit is connected to the rectifying circuit to receive the first DC voltage signal and convert the first DC voltage signal into a second DC voltage signal. The processing module is connected between the voltage converting circuit and an output end, so as to output the second DC voltage signal to the output end. The feedback compensation circuit is connected to the output terminal, the processing module and the voltage conversion circuit, and controls the voltage conversion circuit according to the voltage value variation of the output terminal to stabilize the voltage value of the second DC voltage signal.

Wherein, when the processing module detects that the output end is not connected to the load, the processing module outputs a control signal to the feedback compensation circuit, so that the feedback compensation circuit controls the voltage conversion circuit to stop converting the first DC voltage.

Wherein, the processing module outputs an activation signal to the feedback compensation circuit after a time interval, so that the voltage conversion circuit converts the voltage conversion operation again.

According to the purpose of the present invention, a power control method is proposed. The power control method includes using a rectifier circuit to receive an AC voltage signal with a variable voltage value input from a power input terminal, and rectifies the AC voltage signal into a first DC voltage signal. Then use the voltage conversion circuit to receive the first DC voltage signal, and convert the first DC voltage signal into a second DC voltage signal. A processing module is used to receive the second DC voltage signal and output the second DC voltage signal to an output terminal. Finally, a feedback compensation circuit is used to control the voltage conversion circuit according to the voltage variation of the output terminal, so that the voltage conversion circuit outputs a second DC voltage signal with a stable voltage value.

Wherein, when the output end is not connected with a load, the processing module is used to output a control signal to the feedback compensation circuit, so that the feedback compensation circuit controls the voltage conversion circuit to stop converting the first DC voltage.

Wherein, the processing module outputs an activation signal to the feedback compensation circuit after a time interval, so that the voltage conversion circuit converts the voltage conversion operation again.

Based on the above, according to the power supply device and power control method of the present invention, it can have the following advantages:

The power supply device and its power control method can use the processing module to detect whether the load exists, so as to decide whether to turn off the voltage conversion circuit, so as to overcome the problem of unnecessary power dissipation when the load does not exist.

Description of drawings

Fig. 1 is a block diagram of a power supply device in the prior art;

2 is a schematic diagram of an output signal waveform of a power supply device in the prior art;

3 is a block diagram of a preferred embodiment of the power supply device of the present invention;

4 is a schematic circuit diagram of a rectifier circuit in a preferred embodiment of the power supply device of the present invention;

Fig. 5 (a)～(b) is the waveform diagram of the second DC voltage signal when there is load and no load in the preferred embodiment of the power supply device of the present invention;

FIG. 6 is a flowchart of implementation steps of the power control method of the present invention.

in:

11: input terminal;

12: bridge rectifier;

13: buck filter;

14: feedback circuit;

15, 26: output terminal;

2: Power supply device;

21: Power input terminal;

22: rectification circuit;

221: the first side coil;

221: second side coil;

223: bridge rectifier;

2230: diode;

23: Voltage conversion circuit;

24: processing module;

25: Feedback compensation circuit;

Va: AC voltage signal;

Vc: control signal;

Vd1: the first DC voltage signal;

Vd2: second DC voltage signal; and

S10-S60: steps.

Detailed ways

As shown in FIG. 3 , it is a block diagram of a preferred embodiment of the power supply device of the present invention. In this figure, the power supply device 2 includes a rectification circuit 22 , a voltage conversion circuit 23 , a processing module 24 and a feedback compensation circuit 25 . The rectification circuit 22 receives the variable AC voltage signal Va input from the power input terminal 21 to rectify the AC voltage signal into a first DC voltage signal Vd1. In this embodiment, the rectifier circuit 22 includes a first side coil 221 , a second side coil 222 and a bridge rectifier 223 , and the bridge rectifier 223 is composed of four diodes 2230 , as shown in FIG. 4 . The rectifier circuit 22 can isolate the power input terminal 21 from the output terminal 26 through the first side coil 221 and the second side coil 222 to ensure safe use, and the bridge rectifier 223 can convert the negative half cycle of the AC voltage signal Va The voltage signal during the period is converted into a first DC voltage signal Vd1 with a positive amplitude, and the first DC voltage signal Vd1 is sent to the voltage converting circuit 23 .

Among them, the frequency of the AC voltage signal Va provided by the general mains is 60 Hz (Hz), and the amplitude is 110 volts (V) or 220 volts (V), but this amplitude usually has an error of 5 to 10%, so it is determined by the power supply The voltage value of the signal received by the input terminal 21 is in a state of fluctuation.

The voltage converting circuit 23 is connected to the rectifying circuit 22 to receive the first DC voltage signal Vd1 and convert the first DC voltage signal Vd1 into a second DC voltage signal Vd2. The processing module 24 is connected to the voltage conversion circuit 23 to transmit the second DC voltage signal Vd2 to the output terminal 26 . In addition, in addition to converting the first DC voltage signal Vd1 into the second DC voltage signal Vd2, the voltage conversion circuit 23 can also filter the ripple (Ripple) component in the first DC voltage signal Vd1 by the filter capacitor in the voltage conversion circuit 23. divide, so as to output the second DC voltage signal Vd2 with better DC quality. In addition, usually the DC voltage required by the output terminal 26 is lower than the first DC voltage signal Vd1, so the voltage conversion circuit 23 is a step-down circuit.

In order to overcome the unstable voltage value of the AC voltage signal Va, the feedback compensation circuit 25 is connected between the output terminal and the voltage conversion circuit 23, and the voltage conversion circuit 23 is controlled according to the voltage variation of the second DC voltage signal Vd2, so as to The voltage converting circuit 23 outputs the second DC voltage signal Vd2 with a stable voltage value.

The processing module 24 is not only responsible for transmitting the second DC voltage signal Vd2 to the output terminal 26, but also can detect whether the output terminal 26 is connected with a load. When the output terminal 26 is connected to a load, this is a normal working state. The power supply device of the present invention continuously converts the received AC voltage signal Va to output the DC voltage required by the load. But when the output terminal 26 is not connected to a load, the processing module will generate a control signal Vc to the feedback compensation circuit 25, so that the feedback compensation circuit 25 controls the voltage conversion circuit 23 to stop the conversion, and at the same time closes the rectification circuit 22, In order to reduce the magnetic loss generated during the conversion of the AC voltage signal into the first DC voltage signal Vd1 and the line loss generated by the voltage signal passing through the DC impedance in the voltage conversion circuit 23 .

As shown in FIG. 5 , it is a waveform diagram of the second DC voltage signal with and without load in a preferred embodiment of the power supply device of the present invention. In the figure, the input AC voltage signal Va is 110 volts (V), and the output second DC voltage signal Vd2 is 19 volts (V) as an example. When the processing module 24 detects that the output terminal 260 is connected to a load, Make the power supply device 2 of the present invention continuously supply the 19 volts (V) DC voltage required by the load, as shown in FIG. 5( a ). When the processing module 24 detects that the output terminal 26 is not connected to the load, the processing module 24 will send a control signal Vc to close the feedback compensation circuit 25, that is, to stop the voltage conversion operation of the power supply device 2 of the present invention, as shown in Figure 5 As shown in (b), therefore, the magnetic loss generated when the voltage signal in the rectifier circuit 22 is converted by the coil, and the line loss generated by the voltage signal passing through the DC impedance can be eliminated.

In addition, after a fixed time interval of the power supply device 2 , the processing module 24 can output a start signal to the feedback compensation circuit 25 to enable the power supply device 2 to perform voltage conversion again. This fixed time interval is preferably one second. If it is detected that the output terminal 26 is connected to a load, the power supply device 2 continues to supply power. If the output terminal 26 is not connected to a load, the processing module 24 sends out the control signal Vc again. It is worth noting that the processing module 24 can be built in or connected with a temporary power supply, and the power supply device 2 can charge the temporary power supply when the voltage conversion operation is performed. When the power supply device 2 stops voltage conversion, the temporary power supply can provide The processing module 24 generates the power required for the activation signal. The temporary power supply is preferably an energy storage capacitor with an appropriate capacitance, and the capacitance value can be determined according to the above-mentioned fixed time interval.

As shown in FIG. 6 , it is a flowchart of implementation steps of the power control method of the present invention. This power control method includes the following steps:

In step S10, the AC voltage signal is received by the rectification circuit, and the AC voltage signal is rectified into a first DC voltage signal.

In step S20, the first DC voltage signal is converted into a second DC voltage signal.

In step S30, output the second DC voltage signal to the output terminal.

In step S40, the processing module is used to detect whether the output terminal is connected to a load, and if there is connection, return to step S10, and if not, proceed to step S50.

In step S50, stop outputting the voltage signal to the output terminal.

In step S60, the voltage conversion operation is restarted, and then step S40 is performed.

The above description is for example only, and does not limit the present invention in any way. Any equivalent modification or change without departing from the spirit and scope of the present invention shall be included in the patent scope of the application for protection of the present invention.

Claims (10)

1. power supply device is characterized in that comprising:

One rectification circuit is used to receive the variable alternating voltage signal of magnitude of voltage that a power input is imported, and this alternating voltage signal is rectified into one first direct voltage signal;

One voltage conversion circuit connects this rectification circuit, receiving this first direct voltage signal, and this first direct voltage signal is converted to one second direct voltage signal;

One handles module, is connected between this voltage conversion circuit and the output, to export this second direct voltage signal to this output; And

One back coupling compensating circuit is connected with this output, this processing module and this voltage conversion circuit respectively, and controls this voltage conversion circuit according to the magnitude of voltage change of this output, makes the magnitude of voltage of this second direct voltage signal stable;

Wherein, when this processing module was detected this output and do not connected load, this processing module was then exported a controlling signal and is feedback compensating circuit to this, makes this back coupling compensating circuit control this voltage conversion circuit and stops to change this first direct voltage.

2. power supply device as claimed in claim 1, it is characterized in that when this output does not connect load, this processing module then after a time interval output one start signal and feedback compensating circuit to this, make this voltage conversion circuit changing voltage switching motion once more.

3. power supply device as claimed in claim 2 is characterized in that a built-in storage capacitor in this processing module, after providing this voltage conversion circuit to stop the voltage transitions action, starts the required electric power of this voltage conversion circuit once more.

4. power supply device as claimed in claim 2 is characterized in that more comprising a storage capacitor and is connected in this processing module, after providing this voltage conversion circuit to stop the voltage transitions action, starts the required electric power of this voltage conversion circuit once more.

5. power supply device as claimed in claim 1, it is characterized in that this rectification circuit comprises one first lateral coil, one second lateral coil and a bridge rectifier, this first lateral coil connects this power input, this second lateral coil connects this bridge rectifier, and this bridge rectifier connects this voltage conversion circuit.

6. power control method comprises the following step:

Utilize a rectification circuit to receive the variable alternating voltage signal of magnitude of voltage that a power input is imported, and this alternating voltage signal is rectified into one first direct voltage signal;

Use a voltage conversion circuit to receive this first direct voltage signal, and this first direct voltage signal is converted to one second direct voltage signal;

Utilize a processing module to receive this second direct voltage signal, and export this second direct voltage signal to an output;

Utilize a back coupling compensating circuit this voltage conversion circuit of magnitude of voltage change control, make this second direct voltage signal of this voltage conversion circuit output voltage value stabilization according to this output;

Use this processing module to detect this output and whether connect a load; And

When this output does not connect load, use this processing module to export a controlling signal and feedback compensating circuit to this, make this back coupling compensating circuit control this voltage conversion circuit and stop to change this first direct voltage.

7. power control method as claimed in claim 6, it is characterized in that when this output does not connect load, after a time interval, use this processing module output one to start signal and feedback compensating circuit to this, make this voltage conversion circuit changing voltage switching motion once more.

8. power control method as claimed in claim 7 is characterized in that the built-in storage capacitor of this processing module, after providing this voltage conversion circuit to stop the voltage transitions action, starts the required electric power of this voltage conversion circuit once more.

9. power control method as claimed in claim 7 is characterized in that more comprising a storage capacitor, after providing this voltage conversion circuit to stop the voltage transitions action, starts the required electric power of this voltage conversion circuit once more.

10. power control method as claimed in claim 6, it is characterized in that this rectification circuit comprises one first lateral coil, one second lateral coil and a bridge rectifier, this first lateral coil connects this power input, this second lateral coil connects this bridge rectifier, and this bridge rectifier connects this voltage conversion circuit.

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