CN204012647U - IGBT under-voltage protection drive circuit based on PWM controller - Google Patents
IGBT under-voltage protection drive circuit based on PWM controller Download PDFInfo
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- CN204012647U CN204012647U CN201420431766.0U CN201420431766U CN204012647U CN 204012647 U CN204012647 U CN 204012647U CN 201420431766 U CN201420431766 U CN 201420431766U CN 204012647 U CN204012647 U CN 204012647U
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Abstract
The utility model discloses a kind of IGBT under-voltage protection drive circuit based on PWM controller, comprise the under-voltage protecting circuit and the IGBT drive circuit that are electrically connected to PWM controller, PWM controller, under-voltage protecting circuit and IGBT drive circuit are connected with power supply VCC; Under-voltage protecting circuit by reference voltage, voltage ratio and level shifting circuit form; Reference voltage circuit provides a reference voltage to voltage comparator circuit; voltage comparator circuit is compared VCC voltage the corresponding level of rear output with reference voltage; level shifting circuit becomes COMP signal to export PWM controller compensation end to level conversion; when power supply VCC voltage is less than reference voltage; voltage comparator circuit output high level; PWM controller compensation end is forced to be pulled to low level, and IGBT drive circuit turn-offs IGBT, plays under-voltage protection effect.The utility model is simple in structure, with low cost, and dependable performance can be widely used in Switching Power Supply occasion.
Description
Technical field
The utility model relates to a kind of IGBT drive circuit with line under-voltage protection, belongs to Switching Power Supply IGBT and drives resist technology field.
Background technology
Rail vehicle is when normal operation, a series of requirements such as the air exchange system in compartment can satisfied temperature, humidity, cleanliness factor, air velocity, but when ac utility power source lost efficacy, air-conditioning system can proceed to emergency ventilation state automatically, storage battery is supplied with emergency inverter 110V direct current, through conversion, for fan three-phase alternating current, in compartment, blow, for passenger provides fresh air, ensure safety.Emergency inverter is by boosted switch power supply and inverse switch electric power generating composition.110V direct current from storage battery boosts to 500V left and right direct current through boosted switch power supply, then passes through inverse switch power supply, finally exports three-phase alternating current.IGBT under-voltage protection drive circuit is used for boosted switch power supply wherein, to guarantee that IGBT can normally.
Chinese invention patent ZL 201010116319.2 discloses a kind of over-and under-voltage protection lock-in circuit of IGBT driving voltage; this circuit comprises voltage-stabiliser tube, resistance and triode; when the supply voltage that the circuit being barricaded as by voltage-stabiliser tube and triode drives IGBT exceeds setting range, block IGBT driving pulse.The shortcoming of this circuit is that the supply voltage scope that drives can not linear regulation, is subject to the restriction of voltage-stabiliser tube, underaction.
Chinese invention patent application, application number is 201110252637.6 to disclose a kind of IGBT driver, its by IGBT drive circuit, level shifting circuit, optical coupling isolation circuit, over-current detection circuit, fall grid voltage circuit, delay circuit, soft breaking circuit, fault alarm output circuit and circuit for generating negative voltage and form.The shortcoming of this circuit is that circuit is too complicated, and cost is higher, is difficult for debugging and safeguards, is applicable to the occasion higher to IGBT service requirement.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of simple in structure, with low cost, and dependable performance is easy to debugging and safeguards, has the IGBT under-voltage protection drive circuit based on PWM controller of under-voltage protection function.
For solving the problems of the technologies described above, the utility model adopts a kind of like this IGBT under-voltage protection drive circuit based on PWM controller, this under-voltage protection drive circuit comprises under-voltage protecting circuit and the IGBT drive circuit being electrically connected to PWM controller, and described PWM controller, under-voltage protecting circuit and IGBT drive circuit are connected with power supply VCC; Described under-voltage protecting circuit is comprised of reference voltage circuit, voltage comparator circuit and level shifting circuit; Described reference voltage circuit provides a reference voltage to voltage comparator circuit; voltage comparator circuit is compared the corresponding level of rear output by power supply VCC voltage with reference voltage; level shifting circuit becomes COMP signal to export the compensation end of PWM controller to level conversion; when power supply VCC voltage is less than reference voltage; voltage comparator circuit output high level; the compensation end of PWM controller is forced to be pulled to low level, and IGBT drive circuit turn-offs IGBT, plays under-voltage protection effect.
As a kind of preferred implementation of the present utility model, described reference voltage circuit is comprised of the first resistance, the second resistance, the 6th resistance and reference voltage, described voltage comparator circuit is comprised of the 3rd resistance, the 4th resistance, the 5th resistance and voltage comparator, described level shifting circuit is comprised of the 7th resistance, the 8th resistance, the 9th resistance and NPN triode, and described IGBT drive circuit is comprised of the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, diode, NPN transistor and PNP transistor, described reference voltage from PWM controller+5V reference voltage output, one end of the first resistance is connected with the reference voltage output end of PWM controller, one end of the other end of the first resistance and the in-phase input end of voltage comparator and the second resistance, the 6th resistance is connected, the other end ground connection of the second resistance, the 6th other end of resistance and the output of voltage comparator and the 5th resistance, the 7th resistance are connected, one end of the 3rd resistance is connected with the 5th resistance with 8 pin of power supply VCC, voltage comparator, the 3rd other end of resistance and the inverting input of voltage comparator are connected with the 4th resistance one end, the other end ground connection of the 4th resistance, the 5th resistance is connected with the 7th resistance with the output of the 6th resistance, voltage comparator, the 7th one end of resistance and the output of voltage comparator, the 5th resistance and the 6th resistance are connected, the other end of the 7th resistance is connected with the base stage of the 8th resistance one end, NPN triode, the grounded emitter of the other end of the 8th resistance and NPN triode, the collector electrode of NPN triode is connected with the 9th resistance one end, and the other end of the 9th resistance connects the compensation end of PWM controller, the tenth resistance one end is connected with the output of PWM controller, the other end of the tenth resistance and the 11 resistance one end, the base stage of NPN transistor is connected with the transistorized base stage of PNP, the other end ground connection of the 11 resistance, power supply VCC is connected with the collector electrode of NPN transistor, the transistorized grounded collector of PNP, the transistorized emitter of the emitter of NPN transistor and PNP, the negative electrode of diode, the 12 resistance one end is connected, the 12 other end of resistance and the anode of diode, the 13 resistance one end is connected, the other end of the 13 resistance is connected with the grid G end of the 14 resistance one end and Switching Power Supply IGBT, the other end ground connection of the 14 resistance.
Adopt after said structure, the utlity model has following technique effect:
The IGBT drive circuit that the utlity model has under-voltage protection function is to design based on PWM controller; it is the expansion of carrying out in PWM controller function that IGBT drives under-voltage protection; coordinate the pin on PWM controller to realize under-voltage protection function; enriched the function of PWM controller; it is simple in structure, is easy to debugging and safeguards, with low cost; dependable performance, can be widely used in the Switching Power Supply occasion of using PWM controller.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 is a kind of circuit block diagram of the IGBT under-voltage protection drive circuit of the utility model based on PWM controller.
Fig. 2 is a kind of circuit diagram of under-voltage protecting circuit in the utility model.
Fig. 3 is a kind of circuit diagram of IGBT drive circuit in the utility model.
Embodiment
Referring to a kind of IGBT under-voltage protection drive circuit based on PWM controller shown in Fig. 1,2 and 3, this under-voltage protection drive circuit comprises under-voltage protecting circuit and the IGBT drive circuit being electrically connected to PWM controller, and described PWM controller, under-voltage protecting circuit and IGBT drive circuit are connected with power supply VCC; Described under-voltage protecting circuit is comprised of reference voltage circuit, voltage comparator circuit and level shifting circuit; Described reference voltage circuit provides a reference voltage to voltage comparator circuit; voltage comparator circuit is compared the corresponding level of rear output by power supply VCC voltage with reference voltage; level shifting circuit becomes COMP signal to export the compensation end of PWM controller to level conversion; when power supply VCC voltage is less than reference voltage; voltage comparator circuit output high level; the compensation end of PWM controller is forced to be pulled to low level, and IGBT drive circuit turn-offs IGBT, plays under-voltage protection effect.
As a kind of preferred embodiment of the present utility model, as Fig. 2, shown in 3, described reference voltage circuit is by the first resistance R 1, the second resistance R 2, the 6th resistance R 6 and reference voltage V REF form, described voltage comparator circuit is by the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and voltage comparator U1A form, described level shifting circuit is by the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and NPN triode Q1 form, described IGBT drive circuit is by the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, diode D1, NPN transistor Q2 and PNP transistor Q3 form, described reference voltage from PWM controller+5V reference voltage output, one end of the first resistance R 1 is connected with the reference voltage output end VREF of PWM controller, one end of the in-phase input end 3 of the other end of the first resistance R 1 and voltage comparator U1A and the second resistance R 2, the 6th resistance R 6 is connected, the other end ground connection of the second resistance R 2, the output 1 of the other end of the 6th resistance R 6 and voltage comparator U1A and the 5th resistance R 5, the 7th resistance R 7 are connected, one end of the 3rd resistance R 3 is connected with the 5th resistance R 5 with 8 pin of power supply VCC, voltage comparator U1A, the other end of the 3rd resistance R 3 is connected with the 4th resistance R 4 one end with the inverting input 2 of voltage comparator U1A, the other end ground connection of the 4th resistance R 4, the 5th resistance R 5 is connected with the 7th resistance R 7 with the output 1 of the 6th resistance R 6, voltage comparator U1A, one end of the 7th resistance R 7 is connected with output 1, the 5th resistance R 5 and the 6th resistance R 6 of voltage comparator U1A, the other end of the 7th resistance R 7 is connected with the base stage of the 8th resistance R 8 one end, NPN triode Q1, the grounded emitter of the other end of the 8th resistance R 8 and NPN triode Q1, the collector electrode of NPN triode Q1 is connected with the 9th resistance R 9 one end, and the other end of the 9th resistance R 9 connects the compensation end of PWM controller, the tenth resistance R 10 one end are connected with the output PWM of PWM controller, the other end of the tenth resistance R 10 and the 11 resistance R 11 one end, the base stage of NPN transistor Q2 is connected with the base stage of PNP transistor Q3, the other end ground connection of the 11 resistance R 11, power supply VCC is connected with the collector electrode of NPN transistor Q2, the grounded collector of PNP transistor Q3, the emitter of the emitter of NPN transistor Q2 and PNP transistor Q3, the negative electrode of diode D1, the 12 resistance R 12 one end are connected, the anode of the other end of the 12 resistance R 12 and diode D1, the 13 resistance R 13 one end are connected, the other end of the 13 resistance R 13 is connected with the grid G end of the 14 resistance R 14 one end and Switching Power Supply IGBT, the other end ground connection of the 14 resistance R 14.
PWM controller described in the utility model is mode PWM controlled device; because PWM controller has the function of Pulse by Pulse current limliting; utilize this function; corresponding port to PWM controller when under-voltage provides a high level to cause over-current phenomenon avoidance to block output pwm pulse, in the mode of overcurrent, realizes under-voltage protection.
The utility model is when work, first, reference voltage circuit provides a reference voltage to the in-phase input end of voltage comparator U1A, the 6th resistance R 6 is connected between voltage comparator U1A output and in-phase input end, the effect of the 6th resistance R 6 is to provide a stagnant ring for reference voltage, avoid fluctuating in critical point, the voltage of the inverting input monitoring power supply VCC of voltage comparator U1A, by voltage comparator circuit, export corresponding level, by level shifting circuit, exporting COMP signal again holds to the compensation of PWM controller, PWM controller is made corresponding action automatically according to the level of COMP signal.When power supply VCC voltage is greater than reference voltage value, now voltage comparator circuit is output low level, not conducting of NPN triode Q1 in level shifting circuit, and COMP is unaffected for PWM controller compensation end, and PWM controller is normally worked.The magnitude of voltage of the PWM of PWM controller output when high level is stable, and power supply VCC voltage is greater than this value, from IGBT drive circuit, when power supply VCC voltage raises, the high level of the grid G end of Switching Power Supply IGBT is determined by PWM, not affected by power supply VCC, keeps drive level stable.When power supply VCC voltage is less than reference voltage value; voltage comparator circuit will be exported high level; NPN triode Q1 conducting in level shifting circuit; PWM controller compensation end COMP is forced to drag down; now PWM controller will block PWM automatically; continue output low level, by IGBT drive circuit, turn-off IGBT, play under-voltage protection effect.
Claims (2)
1. the IGBT under-voltage protection drive circuit based on PWM controller, it is characterized in that: this under-voltage protection drive circuit comprises under-voltage protecting circuit and the IGBT drive circuit being electrically connected to PWM controller, and described PWM controller, under-voltage protecting circuit and IGBT drive circuit are connected with power supply VCC; Described under-voltage protecting circuit is comprised of reference voltage circuit, voltage comparator circuit and level shifting circuit; Described reference voltage circuit provides a reference voltage to voltage comparator circuit; voltage comparator circuit is compared the corresponding level of rear output by power supply VCC voltage with reference voltage; level shifting circuit becomes COMP signal to export the compensation end of PWM controller to level conversion; when power supply VCC voltage is less than reference voltage; voltage comparator circuit output high level; the compensation end of PWM controller is forced to be pulled to low level, and IGBT drive circuit turn-offs IGBT, plays under-voltage protection effect.
2. the IGBT under-voltage protection drive circuit based on PWM controller according to claim 1, it is characterized in that: described reference voltage circuit is by the first resistance (R1), the second resistance (R2), the 6th resistance (R6) and reference voltage (VREF) form, described voltage comparator circuit is by the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5) and voltage comparator (U1A) form, described level shifting circuit is by the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9) and NPN triode (Q1) form, described IGBT drive circuit is by the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14), diode (D1), NPN transistor (Q2) and PNP transistor (Q3) form, described reference voltage from PWM controller+5V reference voltage output, one end of the first resistance (R1) is connected with the reference voltage output end (VREF) of PWM controller, one end of the in-phase input end (3) of the other end of the first resistance (R1) and voltage comparator (U1A) and the second resistance (R2), the 6th resistance (R6) is connected, the other end ground connection of the second resistance (R2), the output (1) of the other end of the 6th resistance (R6) and voltage comparator (U1A) and the 5th resistance (R5), the 7th resistance (R7) are connected, one end of the 3rd resistance (R3) is connected with the 5th resistance (R5) with 8 pin of power supply VCC, voltage comparator (U1A), the other end of the 3rd resistance (R3) is connected with the 4th resistance (R4) one end with the inverting input (2) of voltage comparator (U1A), the other end ground connection of the 4th resistance (R4), the 5th resistance (R5) is connected with the 7th resistance (R7) with the output (1) of the 6th resistance (R6), voltage comparator (U1A), one end of the 7th resistance (R7) is connected with output (1), the 5th resistance (R5) and the 6th resistance (R6) of voltage comparator (U1A), the other end of the 7th resistance (R7) is connected with the base stage of the 8th resistance (R8) one end, NPN triode (Q1), the grounded emitter of the other end of the 8th resistance (R8) and NPN triode (Q1), the collector electrode of NPN triode (Q1) is connected with the 9th resistance (R9) one end, and the other end of the 9th resistance (R9) connects the compensation end of PWM controller, the tenth resistance (R10) one end is connected with the output of PWM controller, the other end of the tenth resistance (R10) and the 11 resistance (R11) one end, the base stage of NPN transistor (Q2) is connected with the base stage of PNP transistor (Q3), the other end ground connection of the 11 resistance (R11), power supply VCC is connected with the collector electrode of NPN transistor (Q2), the grounded collector of PNP transistor (Q3), the emitter of the emitter of NPN transistor (Q2) and PNP transistor (Q3), the negative electrode of diode (D1), the 12 resistance (R12) one end is connected, the anode of the other end of the 12 resistance (R12) and diode (D1), the 13 resistance (R13) one end is connected, the other end of the 13 resistance (R13) is connected with the grid G end of the 14 resistance (R14) one end and Switching Power Supply IGBT, the other end ground connection of the 14 resistance (R14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420431766.0U CN204012647U (en) | 2014-08-01 | 2014-08-01 | IGBT under-voltage protection drive circuit based on PWM controller |
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| CN201420431766.0U CN204012647U (en) | 2014-08-01 | 2014-08-01 | IGBT under-voltage protection drive circuit based on PWM controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106314312A (en) * | 2015-06-19 | 2017-01-11 | 西门子公司 | Monitoring circuit, driving device of motor, electric vehicle and hybrid vehicle |
| CN107957702A (en) * | 2017-12-29 | 2018-04-24 | 中航电测仪器股份有限公司 | The method of controller electromagnetism interference is launched in hanging and controller is launched in hanging |
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2014
- 2014-08-01 CN CN201420431766.0U patent/CN204012647U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106314312A (en) * | 2015-06-19 | 2017-01-11 | 西门子公司 | Monitoring circuit, driving device of motor, electric vehicle and hybrid vehicle |
| CN106314312B (en) * | 2015-06-19 | 2018-11-20 | 西门子公司 | Monitor circuit, the driving device of motor, electric vehicle and hybrid vehicle |
| CN107957702A (en) * | 2017-12-29 | 2018-04-24 | 中航电测仪器股份有限公司 | The method of controller electromagnetism interference is launched in hanging and controller is launched in hanging |
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Effective date of registration: 20160902 Address after: 213166 Jiangsu province Changzhou Fenglin Wujin high tech Industrial Development Zone, Road No. 199 Patentee after: Xin Yu track traffic Science and Technology Ltd. Address before: 213164 Jiangsu city of Changzhou province were Wujin high tech Industrial Development Zone, Road No. 68 Patentee before: New United Group Co., Ltd. |