CN102709884A - Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function - Google Patents
Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function Download PDFInfo
- Publication number
- CN102709884A CN102709884A CN2012101833583A CN201210183358A CN102709884A CN 102709884 A CN102709884 A CN 102709884A CN 2012101833583 A CN2012101833583 A CN 2012101833583A CN 201210183358 A CN201210183358 A CN 201210183358A CN 102709884 A CN102709884 A CN 102709884A
- Authority
- CN
- China
- Prior art keywords
- circuit unit
- resonant circuit
- overcurrent protection
- protection function
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004065 semiconductor Substances 0.000 claims description 15
- 238000005070 sampling Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a bridge type LC (inductance capacitance) resonance circuit with an overcurrent protection function. The bridge type LC resonance circuit comprises a switch circuit unit, a resonance circuit unit and an overcurrent protection unit, wherein the switch circuit unit is used for controlling the on-off state of driving signals of external loads, the resonance circuit unit is connected with the switch circuit unit and is used for generating high voltage, the overcurrent protection unit is connected with the switch circuit unit and the resonance circuit unit and is used for sampling current output by the switch circuit unit, and the switch circuit unit is forcibly switched off when the current is excessive. The bridge type LC resonance circuit with the overcurrent protection function is implemented in a zero-current switch-on mode, the circuit is protected, and simplicity and convenience are realized.
Description
Technical field
The present invention relates to circuit protection field, particularly a kind of bridge-type LC resonant circuit with overcurrent protection function.
Background technology
In the circuit that contains electric capacity and inductance, if electric capacity and inductance parallel connection, possibly appear in certain very little time period: the voltage of electric capacity raises gradually, and electric current reduces gradually; Meanwhile the electric current of inductance but increases gradually, and the voltage of inductance but reduces gradually.And in another very little time period: the voltage of electric capacity reduces gradually, and electric current increases gradually; Meanwhile the electric current of inductance but reduces gradually, and the voltage of inductance but raises gradually.The increase of voltage can reach a positive maximum, and the reduction of voltage also can reach a negative maximum, and the variation of positive negative direction also can take place in this process same sense of current, and this moment, we were called the vibration that electricity takes place circuit.
Electric capacity and inductance series connection, the capacitor discharge, inductance begins to have a reverse recoil electric current, induction charging; When the voltage of inductance reached maximum, capacitor discharge finished, and inductance begins discharge afterwards, and electric capacity begins charging, and so reciprocal running is called resonance.And in this process inductance owing to constantly discharge and recharge, so just produced electromagnetic wave.
The circuit oscillation phenomenon possibly fade away, and also possibly continue keeping unchangeably.When concussion continued to keep, we were referred to as self-sustained oscillation, were also referred to as resonance.
The time that resonance time electric capacity or inductance voltage change one-period is called harmonic period, and the inverse of harmonic period is called resonance frequency.The definition that comes to this of so-called resonance frequency.The relating to parameters of it and capacitor C and inductance L.
Bridge-type LC resonant circuit is used for needing to produce the occasion of high pressure more, and two kinds of citation forms are arranged: half-bridge and full-bridge, but, be prone to cause that upper and lower two switching tubes are common all in the following time of zero current turning-on pattern of resonance condition, influence the fail safe of circuit.
Summary of the invention
The present invention proposes a kind of bridge-type LC resonant circuit with overcurrent protection function, has solved prior art zero current turning-on pattern following time, is prone to cause that upper and lower two switching tubes are common, influences the problem of the fail safe of circuit.
Technical scheme of the present invention is achieved in that
The invention discloses a kind of bridge-type LC resonant circuit with overcurrent protection function; The switching circuit unit that comprises the break-make of the drive signal of controlling applied load; The resonant circuit unit that is used to produce high pressure that links to each other with described switching circuit unit also comprises the over-current protecting unit that is connected with described switching circuit unit and resonant circuit unit, is used for the electric current of described switching circuit unit output is taken a sample; When electric current is excessive, force to turn-off described switching circuit unit.
In the bridge-type LC resonant circuit with overcurrent protection function of the present invention; Described switching circuit unit is made up of two groups of identical switching circuit subelements; Every group of switching circuit subelement comprises metal-oxide-semiconductor and resistance, and the source electrode of metal-oxide-semiconductor links to each other with described resonant circuit unit through resistance.
In the bridge-type LC resonant circuit with overcurrent protection function of the present invention, described resonant circuit unit comprises first electric capacity, inductance, second electric capacity, the 3rd electric capacity of serial connection successively.
In the bridge-type LC resonant circuit with overcurrent protection function of the present invention; Described over-current protecting unit comprises two triodes; First triode links to each other with the described first switching circuit subelement, and second triode links to each other with described second switch circuit subelement.
In the bridge-type LC resonant circuit with overcurrent protection function of the present invention; Described first triode links to each other with the described first switching circuit subelement; Specifically: the collector electrode of described first triode links to each other with the grid of described metal-oxide-semiconductor; Emitter links to each other with described resonant circuit unit, and base stage connects the common junction of described metal-oxide-semiconductor and described resistance.
In the bridge-type LC resonant circuit with overcurrent protection function of the present invention; Described second triode links to each other with described second switch circuit subelement; Specifically: the collector electrode of described second triode links to each other with the grid of described metal-oxide-semiconductor; Emitter links to each other with described resonant circuit unit, and base stage connects the common junction of described metal-oxide-semiconductor and described resistance.
In the bridge-type LC resonant circuit with overcurrent protection function of the present invention, described triode is a NPN type triode.
A kind of bridge-type LC resonant circuit with overcurrent protection function of embodiment of the present invention has following beneficial technical effects:
1, adopt hardware mode to protect, safe and reliable;
2, the protective circuit principle is simple and clear, the convenient application;
3, solved the fatal drawback of traditional circuit with few device.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the half-bridge resonance circuit diagram of prior art of the present invention;
Fig. 2 is the full-bridge resonant circuit figure of prior art of the present invention;
Fig. 3 is a kind of bridge-type LC resonant circuit figure with overcurrent protection function of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
See also Fig. 1 and Fig. 2, the resonant circuit of prior art of the present invention,
Fig. 1 is a half-bridge structure, and the busbar voltage utilance of this kind mode is 50%.Be VO≤0.5VIN
Fig. 2 is a full bridge structure, and the busbar voltage utilance of this kind mode is 100%.Be VO≤VIN
When this two kinds of circuit workings during in resonance condition, inductance L 1 capacitor C 1 capacitor C 2 capacitor C 3 can form a capacitive load, can make circuit working in ZCS (zero current turning-on pattern) pattern.
With Fig. 1 is that example is analyzed: under the ZCS pattern; When switching tube Q1 is opening state, have the I1 electric current and flow through, direction is for just; This moment, switching tube Q2 was an off state; But when the moment that switching tube Q1 has just opened, continue to flow through among the parasitic diode D2 of freewheel current I2 in switching tube Q2 body that causes because of inductance L 1, and direction is for negative.Can not recover off state immediately because of diode D2 has certain reverse recovery time, so this moment, switching tube Q1 and switching tube Q2 are conducting state, and this state is held time in hundreds of ns.According to the difference of switching tube parameter, the time that conducting state is kept can be variant.Wherein, switching tube is metal-oxide-semiconductor: metal (metal)-oxide (oxid)-semiconductor (semiconductor) field-effect transistor.
Can know that according to Fig. 1 if switching tube Q1 switching tube Q2 conducting simultaneously promptly means the VIN short circuit, the electric current that on switching tube, produces can be very big, has a strong impact on the operate as normal of switching tube, even can cause its damage.
Fig. 1 can work in the ZCS pattern under resonance condition, thereby causes that upper and lower two switching tubes are common, influences the fail safe of circuit.
Fig. 2 is a full-bridge mode, compared to Figure 1, many switching tube Q3, switching tube Q4, diode D3, diode D4, concrete connected mode is as shown in Figure 2.
The reason of existing unsteadiness of Fig. 2 and generation thereof is identical with Fig. 1, here not in narration.
As shown in Figure 3; A kind of bridge-type LC resonant circuit figure with overcurrent protection function of the present invention comprises the switching circuit unit of the break-make of the drive signal of controlling applied load, the resonant circuit unit that is used to produce high pressure that links to each other with the switching circuit unit; Also comprise the over-current protecting unit that is connected with switching circuit unit and resonant circuit unit; Be used for the electric current of switch circuit unit output is taken a sample, when electric current is excessive, force to turn-off described switching circuit unit.
Specifically: switching tube Q1, diode D1, resistance R 1 are formed the first switching circuit unit, and switching tube Q2, diode D2, resistance R 2 are formed the second switch circuit unit; Capacitor C 1, inductance L 1, capacitor C 2, capacitor C 3 are formed the resonant circuit unit; Triode K1 and triode K2 form over-current protecting unit, and concrete connected mode is as shown in Figure 3.
Work, protection philosophy is following:
When resonance, the circuit working of Fig. 3 is in the ZCS pattern, and switching tube Q1 is a normally, and switching tube Q2 is because of the former thereby conducting of diode D2.Because of its electric current is negative, so the electric current I 1 that conducting simultaneously produces is greater than I2.When the value of I1 reached the maximum rating of switching tube Q1, switching tube K1 conducting was forced the driving of switching tube Q1 to drag down, turn-off.
When switching tube Q2 is a normally, when switching tube Q1 was unusual conducting, the value of I2 was greater than I1, but when it reached rated value, trigger triode K2 conducting was forced the driving of switching tube Q2 to drag down, turn-off.
Triode K1/K2 is common NPN type triode, and the BE utmost point needs the voltage of 0.6～0.7V to get final product conducting, sampling current on R1 and the magnitude of voltage Ube=I1*R1 that obtains.Ube is known as 0.7V here, and I1 is the current value (for given value) of desire restriction, so value=Ube/I1 of R1.
This mode is under the ZCS pattern and under other working condition and the protection that the switching device body overcurrent that produces is played is reliably, fast, effectively.
Because of the value of sample resistance R1 and resistance R 2 is very little, so and the loss of generation can be ignored
Fig. 3 protects to switching tube under the form of basic circuit.Under the ZCS pattern, the current value of switching tube is taken a sample, when electric current is excessive it is forced to turn-off.
A kind of bridge-type LC resonant circuit with overcurrent protection function of embodiment of the present invention has following beneficial technical effects:
1, adopt hardware mode to protect, safe and reliable;
2, the protective circuit principle is simple and clear, the convenient application;
3, solved the fatal drawback of traditional circuit with few device.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. bridge-type LC resonant circuit with overcurrent protection function; The switching circuit unit that comprises the break-make of the drive signal of controlling applied load, the resonant circuit unit that is used to produce high pressure that links to each other with described switching circuit unit is characterized in that; Also comprise the over-current protecting unit that is connected with described switching circuit unit and resonant circuit unit; Be used for the electric current of described switching circuit unit output is taken a sample, when electric current is excessive, force to turn-off described switching circuit unit.
2. the bridge-type LC resonant circuit with overcurrent protection function according to claim 1; It is characterized in that; Described switching circuit unit is made up of two groups of identical switching circuit subelements; Every group of switching circuit subelement comprises metal-oxide-semiconductor and resistance, and the source electrode of metal-oxide-semiconductor links to each other with described resonant circuit unit through resistance.
3. the bridge-type LC resonant circuit with overcurrent protection function according to claim 1 is characterized in that, described resonant circuit unit comprises first electric capacity, inductance, second electric capacity, the 3rd electric capacity of serial connection successively.
4. the bridge-type LC resonant circuit with overcurrent protection function according to claim 2; It is characterized in that; Described over-current protecting unit comprises two triodes; First triode links to each other with the described first switching circuit subelement, and second triode links to each other with described second switch circuit subelement.
5. the bridge-type LC resonant circuit with overcurrent protection function according to claim 4; It is characterized in that; Described first triode links to each other with the described first switching circuit subelement; Specifically: the collector electrode of described first triode links to each other with the grid of described metal-oxide-semiconductor, and emitter links to each other with described resonant circuit unit, and base stage connects the common junction of described metal-oxide-semiconductor and described resistance.
6. the bridge-type LC resonant circuit with overcurrent protection function according to claim 4; It is characterized in that; Described second triode links to each other with described second switch circuit subelement; Specifically: the collector electrode of described second triode links to each other with the grid of described metal-oxide-semiconductor, and emitter links to each other with described resonant circuit unit, and base stage connects the common junction of described metal-oxide-semiconductor and described resistance.
7. the bridge-type LC resonant circuit with overcurrent protection function according to claim 4 is characterized in that, described triode is a NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183358.3A CN102709884B (en) | 2012-06-01 | 2012-06-01 | Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183358.3A CN102709884B (en) | 2012-06-01 | 2012-06-01 | Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102709884A true CN102709884A (en) | 2012-10-03 |
| CN102709884B CN102709884B (en) | 2015-01-21 |
Family
ID=46902502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210183358.3A Active CN102709884B (en) | 2012-06-01 | 2012-06-01 | Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102709884B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010009494A1 (en) * | 2000-01-26 | 2001-07-26 | Shinichi Umekawa | Over current protection circuit of semiconductor switching device |
| CN201294458Y (en) * | 2008-09-28 | 2009-08-19 | 深圳市同洲电子股份有限公司 | Bridge type converter capable of preventing bridge arm from direct connection and electronic equipment |
| CN101517853A (en) * | 2006-09-28 | 2009-08-26 | 奥斯兰姆施尔凡尼亚公司 | Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor |
| CN202586300U (en) * | 2012-06-01 | 2012-12-05 | 深圳市朗科电器有限公司 | Bridge-type LC resonance circuit with overcurrent protection function |
-
2012
- 2012-06-01 CN CN201210183358.3A patent/CN102709884B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010009494A1 (en) * | 2000-01-26 | 2001-07-26 | Shinichi Umekawa | Over current protection circuit of semiconductor switching device |
| CN101517853A (en) * | 2006-09-28 | 2009-08-26 | 奥斯兰姆施尔凡尼亚公司 | Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor |
| CN201294458Y (en) * | 2008-09-28 | 2009-08-19 | 深圳市同洲电子股份有限公司 | Bridge type converter capable of preventing bridge arm from direct connection and electronic equipment |
| CN202586300U (en) * | 2012-06-01 | 2012-12-05 | 深圳市朗科电器有限公司 | Bridge-type LC resonance circuit with overcurrent protection function |
Non-Patent Citations (1)
| Title |
|---|
| 林勇: "功率模块的过电流保护", 《电源技术应用》, vol. 8, no. 7, 31 July 2005 (2005-07-31), pages 36 - 40 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102709884B (en) | 2015-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102158067B (en) | Starting circuit for switching power supply | |
| US20100315152A1 (en) | Control method for soft switch circuit in switch power supply | |
| CN101771266B (en) | Over-current protection circuit applied to high-power motor and on-vehicle lamp | |
| CN101771353B (en) | Auxiliary source circuit for switch power supply | |
| CN106024497B (en) | Auxiliary circuit for high-short-circuit turn-off direct-current circuit breaker and control method thereof | |
| CN105656469A (en) | Combined switch thyristor circuit | |
| CN202772560U (en) | IGBT overcurrent protection circuit and inductive load control circuit | |
| CN201656780U (en) | Auxiliary source circuit applicable to switch power supply | |
| CN105978372B (en) | A kind of topological circuit and half-bridge topology circuit and three phase full bridge topological circuit | |
| CN209046525U (en) | A kind of MARX generator | |
| CN203193500U (en) | Switching power supply and charging loop thereof | |
| CN203896187U (en) | Control circuit of switching-mode power supply | |
| CN203966976U (en) | A kind of direct current relay drive circuit | |
| CN202586300U (en) | Bridge-type LC resonance circuit with overcurrent protection function | |
| CN101282077B (en) | Power supply converter capable of protecting input low-voltage | |
| CN102035375B (en) | Switching boost type direct current converter | |
| CN104057181A (en) | Open-phase protection circuit for inverter welding machine | |
| CN202978239U (en) | IGBT straight-through overcurrent protection circuit | |
| CN102709884B (en) | Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function | |
| CN203352433U (en) | Full-bridge LLC conversion circuit | |
| CN214799289U (en) | Power-off discharge circuit of power supply | |
| CN204216865U (en) | Former limit feedback power pipe ON-OFF control circuit | |
| CN216720903U (en) | Voltage peak absorption circuit of full-bridge circuit power device | |
| CN204145450U (en) | High frequency vibrating switch circuit | |
| CN103199702B (en) | A kind of Sofe Switch quasi-resonance circuit and control strategy thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN LONGOOD INTELLIGENT ELECTRIC CO., LTD. Free format text: FORMER NAME: SHENZHEN LONGOOD ELECTRONICS CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Baoan District Shiyan street Shenzhen city Guangdong province 518000 house community AI Qun Lu with rich Industrial Zone No. 8-4 1, 2, 3 floor, building 5 floor left Patentee after: Shenzhen Longood Intelligent Electric Co., Ltd. Address before: Baoan District Shiyan street Shenzhen city Guangdong province 518000 house community AI Qun Lu with rich Industrial Zone No. 8-4 1, 2, 3 floor, building 5 floor left Patentee before: Shenzhen Langke Electrical Appliance Co., Ltd. |