CN105337484A - Upper and lower bridge arm shoot-through protection circuit of H bridge inverter - Google Patents
Upper and lower bridge arm shoot-through protection circuit of H bridge inverter Download PDFInfo
- Publication number
- CN105337484A CN105337484A CN201510829905.4A CN201510829905A CN105337484A CN 105337484 A CN105337484 A CN 105337484A CN 201510829905 A CN201510829905 A CN 201510829905A CN 105337484 A CN105337484 A CN 105337484A
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- comparator
- resistance
- diode
- input
- bridge arm
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
Abstract
The invention discloses an upper and lower bridge arm shoot-through protection circuit of an H bridge inverter. The upper and lower bridge arm shoot-through protection circuit comprises a first comparator, a second comparator, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first diode, a second diode, a third diode, a fourth diode and a fifth diode, wherein the first comparator is provided with a first input end, a second input end and an output end; the second comparator is provided with a first input end, a second input end and an output end. The upper and lower bridge arm shoot-through protection circuit of the H bridge inverter has the advantages that an upper bridge arm and a lower bridge arm are protected from damages when the upper bridge arm and the lower bridge arm are shoot-through.
Description
Technical field
The present invention relates to a kind of protective circuit of H bridge inverter, the upper and lower bridge arm especially relating to a kind of H bridge inverter leads directly to protective circuit.
Background technology
At present, inverter is generally full bridge structure, and adopt H-bridge circuit to realize, this inverter is called H bridge inverter by us.The circuit diagram of existing H bridge inverter as shown in Figure 1, it is made up of four NMOS tube and a resistance, wherein NMOS tube Q1 and NMOS tube Q3 is two upper brachium pontis, NMOS tube Q2 and NMOS tube Q4 is two lower brachium pontis, upper brachium pontis NMOS tube Q1 and lower brachium pontis NMOS tube Q2 forms a half-bridge (i.e. left half-bridge), and upper brachium pontis NMOS tube Q3 and lower brachium pontis NMOS tube Q4 also forms a half-bridge (i.e. right half-bridge).
When H bridge inverter normally works, under the SPWM drive singal control that SPWM signal generator produces, upper brachium pontis and lower brachium pontis (NMOS tube Q1 and NMOS tube Q2 or NMOS tube Q3 and NMOS tube Q4) alternate conduction realize the output of AC signal.But inevitably there are interference or other abnormal conditions in H bridge inverter circuit, these interference and abnormal conditions can cause SPWM drive singal to go wrong.When SPWM drive singal goes wrong, the situation of brachium pontis NMOS tube Q1 and lower brachium pontis NMOS tube Q2 conducting simultaneously or upper brachium pontis NMOS tube Q3 and lower brachium pontis NMOS tube Q4 conducting simultaneously is just there will be in H bridge inverter running, now, short circuit is formed between power end (i.e. the source electrode link of NMOS tube Q1 and NMOS tube Q3) in Fig. 1 and earth terminal GND (i.e. the drain electrode link of NMOS tube Q2 and NMOS tube Q4), straight-through between upper and lower bridge arm (NMOS tube Q1 and NMOS tube Q2 or NMOS tube Q3 and NMOS tube Q4), the voltage VH comparatively large (being generally about 400V) of power end access, upper brachium pontis and lower brachium pontis meeting excessive pressure damages directly cause the damage of H bridge inverter.
In view of this, it is significant to damage when preventing upper brachium pontis and lower bridge arm direct pass that the upper and lower bridge arm designing a kind of H bridge inverter leads directly to protective circuit.
Summary of the invention
The upper and lower bridge arm that technical problem to be solved by this invention is to provide a kind of H bridge inverter leads directly to protective circuit, and this protective circuit is when upper brachium pontis and lower bridge arm direct pass, and in protection, brachium pontis and lower brachium pontis do not damage.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of upper and lower bridge arm of H bridge inverter leads directly to protective circuit, comprise the first comparator, the second comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first diode, the second diode, the 3rd diode, the 4th diode and the 5th diode, the first described comparator has first input end, the second input and output, and the second described comparator has first input end, the second input and output, the negative pole of the first described diode is the first input end that described upper and lower bridge arm leads directly to protective circuit, the positive pole of the first described diode, one end of the 4th described resistance, the output of the first described comparator is connected with the positive pole of the 3rd described diode, the other end access power supply of the 4th described resistance, the negative pole of the second described diode is the second input that described upper and lower bridge arm leads directly to protective circuit, the positive pole of the second described diode, one end of the 3rd described resistance is connected with the first input end of the first described comparator, the other end access power supply of the 3rd described resistance, one end access power supply of the second described resistance, the other end of the second described resistance, one end of the first described resistance is connected with the second input of the first described comparator, the other end ground connection of the first described resistance, the negative pole of the 3rd described diode is connected with the second input of the second described comparator, the first input end of the second described comparator, one end of the 5th described resistance, one end of the 6th described resistance is connected with one end of the 7th described resistance, the other end ground connection of the 5th described resistance, the other end access power supply of the 6th described resistance, the other end of the 7th described resistance is connected with the positive pole of the 4th described diode, the negative pole of the 4th described diode, the output of the second described comparator is connected with the negative pole of the 5th described diode, the just very described upper and lower bridge arm of the 5th described diode leads directly to the output of protective circuit, the operating voltage of described power supply for providing described upper and lower bridge arm to lead directly to protective circuit.
The first described comparator and the second described comparator adopt a model be LM339 voltage comparator chip realize, 5th pin of described voltage comparator chip is the first input end of the first described comparator, 4th pin of described voltage comparator chip is the second input of the first described comparator, 2nd pin of described voltage comparator chip is the output of the first described comparator, 7th pin of described voltage comparator chip is the first input end of the second described comparator, 6th pin of described voltage comparator chip is the second input of the second described comparator, 1st pin of described voltage comparator chip is the output of the second described comparator.In this structure, adopt a voltage comparator chip can realize the function of the first comparator and the second comparator, circuit structure is simple, and cost is lower.
The first described comparator and the second described comparator adopt a model to be that the voltage comparator chip of LM393 realizes, 3rd pin of described voltage comparator chip is the first input end of the first described comparator, 2nd pin of described voltage comparator chip is the second input of the first described comparator, 1st pin of described voltage comparator chip is the output of the first described comparator, 5th pin of described voltage comparator chip is the first input end of the second described comparator, 6th pin of described voltage comparator chip is the second input of the second described comparator, 7th pin of described voltage comparator chip is the output of the second described comparator.In this structure, adopt a voltage comparator chip can realize the function of the first comparator and the second comparator, circuit structure is simple, and cost is lower.
Compared with prior art, the invention has the advantages that an ac output end of first input end and H bridge inverter upper and lower bridge arm being led directly to protective circuit is connected, the SPWM driving signal input of the second input and H bridge inverter that upper and lower bridge arm are led directly to protective circuit is connected, output upper and lower bridge arm being led directly to protective circuit is connected with SPWM signal generator, when going up brachium pontis and lower bridge arm direct pass in H bridge inverter, the voltage of this ac output end is the half (being generally 200V) of the power end access voltage of H bridge inverter, the operating voltage that theres is provided of power supply of protective circuit access is provided much larger than upper and lower bridge arm, so lead directly to the supply voltage (being generally 12V) of protective circuit access for upper and lower bridge arm, the ac output end voltage of H bridge inverter is high level, now, first diode is inoperative, the voltage that upper and lower bridge arm leads directly to the second input of protective circuit is high level, the first input end of the first comparator is the level that high level is greater than its second input, first comparator exports high level, the first input end level of the second comparator is less than its second input level, second comparator exports as low level, upper and lower bridge arm leads directly to the output output low level of protective circuit, now SPWM signal generator is closed, SPWM drive singal is 0 voltage, whole H bridge inverter is in closed condition, upper brachium pontis and lower brachium pontis can not excessive pressure damages.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing H bridge inverter;
Fig. 2 is the circuit diagram of straight-through protective circuit of the present invention;
Fig. 3 is the integrated circuit figure that straight-through protective circuit of the present invention is applied to H bridge inverter.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one: as shown in Figure 1, a kind of upper and lower bridge arm of H bridge inverter leads directly to protective circuit, comprise the first comparator U1, the second comparator U2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and the 5th diode D5, first comparator U1 has first input end, the second input and output, and the second comparator U2 has first input end, the second input and output;
The negative pole of the first diode D1 is the first input end that upper and lower bridge arm leads directly to protective circuit, the positive pole of the first diode D1, one end of 4th resistance R4, the output of the first comparator U1 is connected with the positive pole of the 3rd diode D3, the other end access power supply of the 4th resistance R4, the negative pole of the second diode D2 is the second input that upper and lower bridge arm leads directly to protective circuit, the positive pole of the second diode D2, one end of 3rd resistance R3 is connected with the first input end of the first comparator U1, the other end access power supply of the 3rd resistance R3, one end access power supply of the second resistance R2, the other end of the second resistance R2, one end of first resistance R1 is connected with second input of the first comparator U1, the other end ground connection of the first resistance R1, the negative pole of the 3rd diode D3 is connected with second input of the second comparator U2, the first input end of the second comparator U2, one end of 5th resistance R5, one end of 6th resistance R6 is connected with one end of the 7th resistance R7, the other end ground connection of the 5th resistance R5, the other end access power supply of the 6th resistance R6, the other end of the 7th resistance R7 is connected with the positive pole of the 4th diode D4, the negative pole of the 4th diode D4, the output of the second comparator U2 is connected with the negative pole of the 5th diode D5, the just very upper and lower bridge arm of the 5th diode D5 leads directly to the output of protective circuit, the operating voltage of power supply for providing upper and lower bridge arm to lead directly to protective circuit, this operating voltage is 12V.
In the present embodiment, first comparator U1 and the second comparator U2 adopts a model to be that the voltage comparator chip of LM339 realizes, 5th pin of voltage comparator chip is the first input end of the first comparator U1, 4th pin of voltage comparator chip is second input of the first comparator U1, 2nd pin of voltage comparator chip is the output of the first comparator U1, 7th pin of voltage comparator chip is the first input end of the second comparator U2, 6th pin of voltage comparator chip is second input of the second comparator U1, 1st pin of voltage comparator chip is the output of the second comparator U1.
Embodiment two: as shown in Figure 1, a kind of upper and lower bridge arm of H bridge inverter leads directly to protective circuit, comprise the first comparator U1, the second comparator U2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and the 5th diode D5, first comparator U1 has first input end, the second input and output, and the second comparator U2 has first input end, the second input and output;
The negative pole of the first diode D1 is the first input end that upper and lower bridge arm leads directly to protective circuit, the positive pole of the first diode D1, one end of 4th resistance R4, the output of the first comparator U1 is connected with the positive pole of the 3rd diode D3, the other end access power supply of the 4th resistance R4, the negative pole of the second diode D2 is the second input that upper and lower bridge arm leads directly to protective circuit, the positive pole of the second diode D2, one end of 3rd resistance R3 is connected with the first input end of the first comparator U1, the other end access power supply of the 3rd resistance R3, one end access power supply of the second resistance R2, the other end of the second resistance R2, one end of first resistance R1 is connected with second input of the first comparator U1, the other end ground connection of the first resistance R1, the negative pole of the 3rd diode D3 is connected with second input of the second comparator U2, the first input end of the second comparator U2, one end of 5th resistance R5, one end of 6th resistance R6 is connected with one end of the 7th resistance R7, the other end ground connection of the 5th resistance R5, the other end access power supply of the 6th resistance R6, the other end of the 7th resistance R7 is connected with the positive pole of the 4th diode D4, the negative pole of the 4th diode D4, the output of the second comparator U2 is connected with the negative pole of the 5th diode D5, the just very upper and lower bridge arm of the 5th diode D5 leads directly to the output of protective circuit, the operating voltage of power supply for providing upper and lower bridge arm to lead directly to protective circuit, this operating voltage is 12V.
In the present embodiment, the first comparator U1 and the second comparator U2 adopts a model to be that the voltage comparator chip of LM393 realizes.3rd pin of voltage comparator chip is the first input end of the first comparator U1,2nd pin of voltage comparator chip is second input of the first comparator U1,1st pin of voltage comparator chip is the output of the first comparator U1,5th pin of voltage comparator chip is the first input end of the second comparator U2,6th pin of voltage comparator chip is second input of the second comparator U1, and the 7th pin of voltage comparator chip is the output of the second comparator U1.
The operation principle of straight-through protective circuit of the present invention is: as shown in Figure 3, an ac output end (link of NMOS tube Q3 and NMOS tube Q4) of the first input end and H bridge inverter that upper and lower bridge arm are led directly to protective circuit is connected and its link node is designated as V1, the SPWM driving signal input of the second input and H bridge inverter that upper and lower bridge arm are led directly to protective circuit is connected and its link node is designated as V2, output upper and lower bridge arm being led directly to protective circuit is connected with SPWM signal generator, the voltage of H bridge inverter power end access is designated as VH, the operating voltage that upper and lower bridge arm leads directly to the power supply of protective circuit access is VCC, VCC is 12V,
When H bridge inverter normally works, and NMOS tube Q3 conducting, during NMOS tube Q4 not conducting, the voltage of V1 point approximates VH, the voltage of V2 point is 0 level, the first input end of the first comparator U1 is 0 level, the voltage of second input of the first comparator U1 is greater than the voltage of its first input end, thus make the output of the first comparator be 0 level, so, the voltage of the first input end of the second comparator U2 is higher than the voltage of its second input, the output of the second comparator U2 is high level, the output that upper and lower bridge arm leads directly to protective circuit exports high level, SPWM signal generator normally works, it is inoperative that upper and lower bridge arm leads directly to protective circuit,
When H bridge inverter normally works, and NMOS tube Q3 not conducting, during NMOS tube Q4 conducting, the voltage of V1 point approximate (i.e. 0 level), the voltage of V2 point is high level, the first input end of the first comparator U1 is high level, the voltage of second input of the first comparator U1 is greater than the voltage of its first input end, but because V1 point is 0 level, thus make the voltage of the first comparator output terminal be forced to become 0 level under the first diode D1 effect, so, the voltage of the first input end of the second comparator U2 is higher than the voltage of its second input, the output of the second comparator U2 is high level, the output that upper and lower bridge arm leads directly to protective circuit exports high level, SPWM signal generator normally works, it is inoperative that upper and lower bridge arm leads directly to protective circuit,
When brachium pontis upper in H bridge inverter and lower bridge arm direct pass (i.e. the equal conducting of NMOS tube Q3 and NMOS tube Q4), the voltage of V1 point approximates VH/2 (being generally 200V), the operating voltage VCC that theres is provided of power supply of protective circuit access is provided much larger than upper and lower bridge arm, for VCC, V1 point is high level, now the first diode D1 is inoperative, the voltage of V2 point is high level, the first input end of the first comparator U1 is high level, the voltage of second input of the first comparator U1 is less than the voltage of its first input end, thus make the first comparator U1 output be high level, so, the voltage of the first input end of the second comparator U2 is less than the voltage of its second input, the output of the second comparator U2 is 0 level, upper and lower bridge arm leads directly to the output output low level of protective circuit, now SPWM signal generator is closed, SPWM drive singal is 0 voltage, whole H bridge inverter is in closed condition, upper brachium pontis and lower brachium pontis can not excessive pressure damages.
Claims (3)
1. the upper and lower bridge arm of a H bridge inverter leads directly to protective circuit, it is characterized in that comprising the first comparator, the second comparator, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first diode, the second diode, the 3rd diode, the 4th diode and the 5th diode, the first described comparator has first input end, the second input and output, and the second described comparator has first input end, the second input and output;
The negative pole of the first described diode is the first input end that described upper and lower bridge arm leads directly to protective circuit, the positive pole of the first described diode, one end of the 4th described resistance, the output of the first described comparator is connected with the positive pole of the 3rd described diode, the other end access power supply of the 4th described resistance, the negative pole of the second described diode is the second input that described upper and lower bridge arm leads directly to protective circuit, the positive pole of the second described diode, one end of the 3rd described resistance is connected with the first input end of the first described comparator, the other end access power supply of the 3rd described resistance, one end access power supply of the second described resistance, the other end of the second described resistance, one end of the first described resistance is connected with the second input of the first described comparator, the other end ground connection of the first described resistance, the negative pole of the 3rd described diode is connected with the second input of the second described comparator, the first input end of the second described comparator, one end of the 5th described resistance, one end of the 6th described resistance is connected with one end of the 7th described resistance, the other end ground connection of the 5th described resistance, the other end access power supply of the 6th described resistance, the other end of the 7th described resistance is connected with the positive pole of the 4th described diode, the negative pole of the 4th described diode, the output of the second described comparator is connected with the negative pole of the 5th described diode, the just very described upper and lower bridge arm of the 5th described diode leads directly to the output of protective circuit, the operating voltage of described power supply for providing described upper and lower bridge arm to lead directly to protective circuit.
2. a kind of H bridge inverter upper and lower bridge arm according to claim 1 leads directly to protective circuit, it is characterized in that the first described comparator and the second described comparator adopt a model be LM339 voltage comparator chip realize, 5th pin of described voltage comparator chip is the first input end of the first described comparator, 4th pin of described voltage comparator chip is the second input of the first described comparator, 2nd pin of described voltage comparator chip is the output of the first described comparator, 7th pin of described voltage comparator chip is the first input end of the second described comparator, 6th pin of described voltage comparator chip is the second input of the second described comparator, 1st pin of described voltage comparator chip is the output of the second described comparator.
3. a kind of H bridge inverter upper and lower bridge arm according to claim 1 leads directly to protective circuit, it is characterized in that the first described comparator and the second described comparator adopt a model to be that the voltage comparator chip of LM393 realizes, 3rd pin of described voltage comparator chip is the first input end of the first described comparator, 2nd pin of described voltage comparator chip is the second input of the first described comparator, 1st pin of described voltage comparator chip is the output of the first described comparator, 5th pin of described voltage comparator chip is the first input end of the second described comparator, 6th pin of described voltage comparator chip is the second input of the second described comparator, 7th pin of described voltage comparator chip is the output of the second described comparator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510829905.4A CN105337484B (en) | 2015-11-25 | 2015-11-25 | A kind of upper and lower bridge arm of H bridge inverters leads directly to protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510829905.4A CN105337484B (en) | 2015-11-25 | 2015-11-25 | A kind of upper and lower bridge arm of H bridge inverters leads directly to protection circuit |
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| Publication Number | Publication Date |
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| CN105337484A true CN105337484A (en) | 2016-02-17 |
| CN105337484B CN105337484B (en) | 2017-08-15 |
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| CN201510829905.4A Expired - Fee Related CN105337484B (en) | 2015-11-25 | 2015-11-25 | A kind of upper and lower bridge arm of H bridge inverters leads directly to protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105871185A (en) * | 2016-04-25 | 2016-08-17 | 佛山市新光宏锐电源设备有限公司 | Mode control driven self-locking protection circuit |
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| US20110248657A1 (en) * | 2010-04-07 | 2011-10-13 | Denso Corporation | Motor control apparatus |
| CN102710116A (en) * | 2012-05-22 | 2012-10-03 | 奇瑞汽车股份有限公司 | PWM (pulse-width modulation) interlocking drive circuit |
| CN203537223U (en) * | 2013-10-25 | 2014-04-09 | 山东大学 | Bootstrap-supply MOSFET/IGBT driver circuit having negative voltage |
| CN205304597U (en) * | 2015-11-25 | 2016-06-08 | 宁波中焱光伏科技有限公司 | Direct protection circuit of upper and lower bridge arm of H -bridge inverter |
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2015
- 2015-11-25 CN CN201510829905.4A patent/CN105337484B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1084684A (en) * | 1992-09-22 | 1994-03-30 | 华中理工大学 | Can prevent the pulse-width modulated inverter of shoot through |
| 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 |
| US20110248657A1 (en) * | 2010-04-07 | 2011-10-13 | Denso Corporation | Motor control apparatus |
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| CN105871185A (en) * | 2016-04-25 | 2016-08-17 | 佛山市新光宏锐电源设备有限公司 | Mode control driven self-locking protection circuit |
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| CN105337484B (en) | 2017-08-15 |
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