CN203504157U - IGBT protection circuit - Google Patents

IGBT protection circuit Download PDF

Info

Publication number
CN203504157U
CN203504157U CN201320625582.3U CN201320625582U CN203504157U CN 203504157 U CN203504157 U CN 203504157U CN 201320625582 U CN201320625582 U CN 201320625582U CN 203504157 U CN203504157 U CN 203504157U
Authority
CN
China
Prior art keywords
igbt
voltage comparator
power supply
resistance
photoelectrical coupler
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.)
Expired - Fee Related
Application number
CN201320625582.3U
Other languages
Chinese (zh)
Inventor
王昌烨
朱海波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JINAN NODON TECHNOLOGY Co Ltd
Original Assignee
JINAN NODON TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JINAN NODON TECHNOLOGY Co Ltd filed Critical JINAN NODON TECHNOLOGY Co Ltd
Priority to CN201320625582.3U priority Critical patent/CN203504157U/en
Application granted granted Critical
Publication of CN203504157U publication Critical patent/CN203504157U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model relates to an IGBT protection circuit which comprises a voltage comparator and a photoelectric coupler I. The reverse input end of the voltage comparator is respectively connected with an IGBT gate through a resistor I, is connected with an IGBT collector through a diode, and is grounded through a capacitor II. The noninverting input end of the voltage comparator is connected with a reference voltage through a resistor VI. The output end of the voltage comparator is respectively connected with the noninverting input end of the voltage comparator through a diode and a resistor V, is connected with a power supply through a resistor II, and is grounded through a capacitor I, wherein the diode and the resistor V are connected in series. The power supply is respectively connected with the light emitting diode end of the photoelectric coupler I through a resistor III and the output end of the voltage comparator. The collector of a photosensitive triode of the photoelectric coupler I is connected with the power supply, and the emitter is connected with an IGBT drive circuit. When the IGBT is abnormal, the IGBT is rapidly turned off without using a power supply main control board. The damage of the IGBT is effectively avoided, and the reliability of the power supply is improved.

Description

The protective circuit of a kind of IGBT
Technical field
The utility model relates to power technique fields, is specifically related to a kind of power protecting circuit.
Background technology
In power supply product, IGBT, as one of core component, will cause whole power supply to work if damaged.Originally IGBT detected and signal is passed to control board when abnormal, then processed by control board, link is more, processing speed is slow, because IGBT is more fragile, occurs to turn-off and be easy to bombing not in time in abnormal 10us, often there is control board and also do not have enough time to process, but the phenomenon that IGBT has damaged.
Summary of the invention
The utility model is in order to overcome the deficiency of above technology, provides a kind of and when IGBT is abnormal, turn-offed IGBT fast and the protective circuit of the IGBT by control board not.
The utility model overcomes the technical scheme that its technical problem adopts:
The protective circuit of this IGBT, comprise voltage comparator and photoelectrical coupler I, the reverse input end of described voltage comparator is connected in IGBT gate pole through resistance I respectively, through diode, be connected in IGBT collector electrode, through electric capacity II ground connection, the input in the same way of described voltage comparator is connected in reference voltage through resistance VI, the input in the same way that the output of the voltage comparator diode that warp is connected mutually respectively and resistance V are connected in voltage comparator, through resistance II, be connected in power supply, through electric capacity I ground connection, power supply is connected to the light-emitting diodes pipe end of photoelectrical coupler I through the output of resistance III and voltage comparator, the collector electrode of the phototriode of described photoelectrical coupler I is connected in its emitter of power supply and is connected in IGBT drive circuit.
In order to realize, when IGBT is abnormal, send a signal back to power supply master control borad, also comprise photoelectrical coupler II, power supply is connected to the light-emitting diodes pipe end of photoelectrical coupler II through the output of resistance IV and voltage comparator through diode, the collector electrode of the phototriode of described photoelectrical coupler II is connected in its emitter of power supply master control borad and is connected in power supply master control borad GND end.
The beneficial effects of the utility model are: when IGBT gate pole is high level, IGBT is when extremely causing pressure drop excessive, the anti-phase input terminal voltage of voltage comparator is higher than in-phase input end, output output low level, the conducting of photoelectrical coupler I, directly turn-off the pwm signal from IGBT drive circuit, thereby before IGBT damages, just stopped the work of IGBT.Therefore when IGBT is abnormal, turn-off IGBT fast and not by power supply master control borad, effectively avoided the damage of IGBT, improved the reliability of power supply.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model;
In figure, 1. diode 2. resistance I 3. voltage comparator 4. resistance II 5. resistance III 6. photoelectrical coupler I 7. photoelectrical coupler II 8. resistance IV 9. resistance V 10. electric capacity I 11. electric capacity II 12. resistance VI.
Embodiment
Below in conjunction with 1 pair of the utility model of accompanying drawing, be described further.
The protective circuit of this IGBT, comprise voltage comparator 3 and photoelectrical coupler I 6, the reverse input end of described voltage comparator 3 is connected in IGBT gate pole through resistance I 2 respectively, through diode 1, be connected in IGBT collector electrode, through electric capacity II 11 ground connection, the input in the same way of described voltage comparator 3 is connected in reference voltage through resistance VI 12, the input in the same way that the output of voltage comparator 3 diode 1 that warp is connected mutually respectively and resistance V 9 are connected in voltage comparator 3, through resistance II 4, be connected in power supply, through electric capacity I 10 ground connection, power supply is connected to the light-emitting diodes pipe end of photoelectrical coupler I 6 through the output of resistance III 5 and voltage comparator 3, the collector electrode of the phototriode of described photoelectrical coupler I 6 is connected in its emitter of power supply and is connected in IGBT drive circuit.In circuit, " VREF " reference voltage is a little more than the conduction voltage drop of IGBT.When IGBT gate pole is low level, the inverting input of voltage comparator 3 is lower than in-phase input end, its output output high level, the 6 not conductings of photoelectrical coupler I, on circuit without any impact.When IGBT gate pole is high level, IGBT conducting, IGBT collector electrode C is low level, the inverting input of voltage comparator 3 is also lower than in-phase input end, output output high level, the 6 not conductings of photoelectrical coupler I, on circuit also without any impact.When IGBT gate pole is high level, IGBT is when extremely causing pressure drop excessive, the anti-phase input terminal voltage of voltage comparator 3 is higher than in-phase input end, output output low level, 6 conductings of photoelectrical coupler I, directly turn-offed the pwm signal from IGBT drive circuit, this action 3us left and right just can complete, thereby before IGBT damages, has just stopped the work of IGBT.Therefore when IGBT is abnormal, turn-off IGBT fast and not by power supply master control borad, just as the conditioned reflex that nervous centralis is controlled, effectively avoided the damage of IGBT, improved the reliability of power supply.
Also comprise photoelectrical coupler II 7, power supply is connected to the light-emitting diodes pipe end of photoelectrical coupler II 7 through the output of resistance IV 8 and voltage comparator 3 through diode 1, the collector electrode of the phototriode of described photoelectrical coupler II 7 is connected in its emitter of power supply master control borad and is connected in power supply master control borad GND end.IGBT is when extremely causing pressure drop excessive, and the anti-phase input terminal voltage of voltage comparator 3 is higher than in-phase input end, output output low level, and 7 conductings of photoelectrical coupler II, deliver to power supply master control borad by guard signal and do further processing.

Claims (2)

1. the protective circuit of an IGBT, it is characterized in that: comprise voltage comparator (3) and photoelectrical coupler I (6), the reverse input end of described voltage comparator (3) is connected in IGBT gate pole through resistance I (2) respectively, through diode (1), be connected in IGBT collector electrode, through electric capacity II (11) ground connection, the input in the same way of described voltage comparator (3) is connected in reference voltage through resistance VI (12), the input in the same way that the output of voltage comparator (3) diode (1) that warp is connected mutually respectively and resistance V (9) are connected in voltage comparator (3), through resistance II (4), be connected in power supply, through electric capacity I (10) ground connection, power supply is connected to the light-emitting diodes pipe end of photoelectrical coupler I (6) through the output of resistance III (5) and voltage comparator (3), the collector electrode of the phototriode of described photoelectrical coupler I (6) is connected in its emitter of power supply and is connected in IGBT drive circuit.
2. the protective circuit of IGBT according to claim 1; it is characterized in that: also comprise photoelectrical coupler II (7); power supply is connected to the light-emitting diodes pipe end of photoelectrical coupler II (7) through the output of resistance IV (8) and voltage comparator (3) through diode (1), the collector electrode of the phototriode of described photoelectrical coupler II (7) is connected in its emitter of power supply master control borad and is connected in power supply master control borad GND end.
CN201320625582.3U 2013-10-11 2013-10-11 IGBT protection circuit Expired - Fee Related CN203504157U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320625582.3U CN203504157U (en) 2013-10-11 2013-10-11 IGBT protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320625582.3U CN203504157U (en) 2013-10-11 2013-10-11 IGBT protection circuit

Publications (1)

Publication Number Publication Date
CN203504157U true CN203504157U (en) 2014-03-26

Family

ID=50335102

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320625582.3U Expired - Fee Related CN203504157U (en) 2013-10-11 2013-10-11 IGBT protection circuit

Country Status (1)

Country Link
CN (1) CN203504157U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103500989A (en) * 2013-10-11 2014-01-08 济南诺顿科技有限公司 Protection circuit of IGBT (Insulated Gate Bipolar Transistor)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103500989A (en) * 2013-10-11 2014-01-08 济南诺顿科技有限公司 Protection circuit of IGBT (Insulated Gate Bipolar Transistor)

Similar Documents

Publication Publication Date Title
CN203675408U (en) Short-circuit protection circuit for LED lighting device
CN204391679U (en) A kind of leakage current detection protection circuit
CN103152928A (en) Load overvoltage protection circuit and control method thereof
CN103500989A (en) Protection circuit of IGBT (Insulated Gate Bipolar Transistor)
CN203504157U (en) IGBT protection circuit
CN204068678U (en) A kind of Switching Power Supply output over-voltage protection and thermal-shutdown circuit
CN205141638U (en) Switching power supply output short circuit disconnection protection circuit
CN203504786U (en) Electromagnetic heating control circuit and electric pressure cooker
CN204068210U (en) Short-circuit protection circuit
CN203690913U (en) Anti-reverse connection device with short-circuit protection function
CN206563937U (en) One kind calculates internal power supply modular circuit
CN203261005U (en) LED constant-current over-temperature protection circuit and LED lamp
CN203324355U (en) Microwave-system diverse self-checking circuit
CN203339686U (en) Constant current source short circuit protection inhibition circuit
CN202330540U (en) Zero-cross detection circuit
CN206061217U (en) The intelligent protection circuit of buffering transient high-current
CN204103467U (en) A kind of protective circuit of automobile instrument circuit
CN204696663U (en) A kind of efficient output short circuit protection circuit
CN204391842U (en) Battery pack charge balancing circuit
CN204425184U (en) A kind of two-supply circuit
CN204304397U (en) A kind of civil power monitoring system
CN203839998U (en) Battery charging reverse-connection protecting circuit
CN204464966U (en) Voltage protection circuit
CN203233391U (en) Strong drive circuit with short-circuit protection function
CN203826955U (en) Reverse-connection prevention circuit of DC power supply

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140326

Termination date: 20151011

EXPY Termination of patent right or utility model