CN117439588B - Negative voltage IGBT drive circuit with undervoltage protection function based on discrete devices - Google Patents
Negative voltage IGBT drive circuit with undervoltage protection function based on discrete devices Download PDFInfo
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- CN117439588B CN117439588B CN202311547695.0A CN202311547695A CN117439588B CN 117439588 B CN117439588 B CN 117439588B CN 202311547695 A CN202311547695 A CN 202311547695A CN 117439588 B CN117439588 B CN 117439588B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/08116—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit in composite switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/0406—Modifications for accelerating switching in composite switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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Abstract
The invention discloses a negative-pressure IGBT driving circuit with an undervoltage protection function based on discrete devices. The under-voltage protection circuit turns off the driving pulse output by the optocoupler input circuit when the on voltage is lower than a threshold value, and the negative voltage circuit forms a negative voltage as the turn-off voltage of the IGBT so as to protect the IGBT. According to the invention, on the basis of the IGBT driving circuit, the undervoltage protection circuit and the negative voltage turn-off circuit are added to realize the IGBT protection function, so that the safety is improved, and the risk of damage to IGBT devices is reduced.
Description
Technical Field
The invention relates to the technical field of IGBT driving control of an alternating current servo driver, in particular to a negative-pressure IGBT driving circuit with an undervoltage protection function based on discrete devices.
Background
An IGBT (insulated gate bipolar transistor) is a composite device, is a voltage-type power semiconductor device, has advantages of high input impedance, high switching frequency, easy driving, and the like, and is widely used in the fields of electric automobiles, servo drivers, and switching power supplies. Among them, servo drives are widely used in various fields, such as transmitting devices, follower devices, radar systems, etc.
The IGBT driving circuit which is widely applied in the market at present mostly adopts an application-specific integrated driving circuit and a thick film driving circuit, and the driving circuits have the advantages of high integration degree, perfect protection function, strong anti-interference capability and the like, but are expensive and are produced by most foreign manufacturers. In recent years, with the national advocacy of 100% localization of electronic components, part of application-specific integrated driving circuits and thick film driving circuits have not satisfied the use requirements of servo drivers in various fields.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a negative-pressure IGBT driving circuit with an undervoltage protection function based on discrete devices, which integrates the negative-pressure driving circuit and the undervoltage protection function, has a simple peripheral circuit structure, improves the turn-off speed of the IGBT, increases the reliability of turn-on and turn-off, and simultaneously meets the 100% localization requirements of the components.
The invention aims to realize the negative-pressure IGBT driving circuit with the undervoltage protection function based on discrete devices, and is characterized by comprising an optocoupler input circuit, an undervoltage protection circuit and a negative-pressure turn-off circuit which are connected with each other, wherein the optocoupler input circuit is used for isolating and outputting a driving signal PWM_UH sent by an MCU, the undervoltage protection circuit is used for turning off an output pulse of the optocoupler input circuit when the on voltage is lower than a threshold value, the negative-pressure turn-off circuit and the undervoltage protection circuit are integrated together, and the negative-pressure turn-off circuit is used for forming a negative voltage as the turn-off voltage of the IGBT.
Preferably, the optocoupler input circuit comprises an optocoupler, a first resistor, a second resistor and a first capacitor, one end of the first resistor is connected with a driving signal PWM_UH sent by the MCU, the other end of the first resistor is connected with a Cath end of the optocoupler, one end of the second resistor connected with the first capacitor in parallel is connected with an Anode end of the optocoupler, and the other end of the second resistor is connected between the first resistor and the Cath end of the optocoupler.
The under-voltage protection circuit comprises a triode, a first voltage stabilizing tube, a second voltage stabilizing tube, a third resistor, a fourth resistor, an eighth resistor, a second capacitor and a third capacitor, wherein a collector of the triode is connected with a VCC port of an optical coupler, an emitter of the triode is connected with a power supply, a base of the triode, one end of the eighth resistor and one end of the fourth resistor are connected, the other end of the eighth resistor is connected with the power supply, the other end of the fourth resistor is connected with a cathode of the second voltage stabilizing tube, an anode of the second voltage stabilizing tube is connected with a cathode of the first voltage stabilizing tube, an anode of the first voltage stabilizing tube is connected with power supply ground, one end of the second capacitor is connected with a collector of the triode, the other end of the second capacitor is connected with power supply ground, one end of the third resistor connected with a VO end of the optical coupler in parallel, and the other end of the third resistor is connected with the power supply ground.
Preferably, the negative voltage turn-off circuit comprises a third voltage stabilizing tube, a fourth voltage stabilizing tube, a grid resistor, a seventh resistor, a fifth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor; the first end of the grid resistor is connected with the VO end of the optocoupler, the second end of the grid resistor outputs a driving signal, the cathode of the fourth voltage stabilizing tube is connected with the second end of the grid resistor, the anode of the fourth voltage stabilizing tube is connected with the anode of the third voltage stabilizing tube, the cathode of the third voltage stabilizing tube is connected with the ground, one end of the seventh resistor and one end of the ninth capacitor which are connected in parallel are connected with the second end of the grid resistor, the other end of the seventh resistor is connected with the ground, one end of the fifth capacitor, one end of the seventh capacitor and one end of the eighth capacitor which are connected in parallel are connected with the ground, the other end of the eighth capacitor is connected with the power ground, the VCC port of the first voltage stabilizing tube is connected with the ground, the Vee port of the optocoupler is connected with the power ground, and the negative voltage turn-off circuit adopts VCC, VO, vee ports of the first voltage stabilizing tube, the third voltage stabilizing tube, the grid resistor, the seventh resistor, the second capacitor, the fifth capacitor, the seventh capacitor and the ground capacitor as well as IGBT voltage of 5V-5.
The invention has the beneficial effects that the negative-voltage turn-off and under-voltage protection functions are integrated by utilizing the discrete device, the peripheral circuit has simple structure, the design cost of system hardware is reduced, the turn-off speed of the IGBT is improved, the reliability of turn-on and turn-off is increased, the domestic requirements of the device are realized, and the special requirements of equipment on a servo driver are met.
Drawings
Fig. 1 is a schematic diagram of a negative-voltage IGBT driving circuit with an undervoltage protection function constructed based on discrete devices.
Fig. 2 is a schematic diagram of an optocoupler input circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of an undervoltage protection circuit in accordance with an embodiment of the present invention.
Fig. 4 is a schematic diagram of a negative voltage shutdown circuit according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1 to 4, a negative-voltage IGBT driving circuit with an undervoltage protection function is constructed based on discrete devices, and includes an optocoupler input circuit 1, an undervoltage protection circuit 2, and a negative-voltage turn-off circuit 3 that are connected to each other. The optocoupler input circuit 1 is used for isolating and outputting a driving signal PWM_UH sent by the MCU, the undervoltage protection circuit 2 is used for switching off output pulses of the optocoupler input circuit 1 when the conducting voltage of the collector electrode of the triode V5 is lower than a threshold value, the negative voltage switching-off circuit 3 and the undervoltage protection circuit 2 are integrated together, and the negative voltage switching-off circuit 3 is used for forming a negative voltage serving as the switching-off voltage of the IGBT.
The optocoupler input circuit 1 comprises an optocoupler N1, a first resistor R1, a second resistor R2 and a first capacitor C1, wherein one end of the first resistor R1 is connected with a driving signal PWM_UH sent by the MCU, the other end of the first resistor R1 is connected with the Cath end of the optocoupler N1, one end of the second resistor R2 connected with the first capacitor C1 in parallel is connected with the Anode end of the optocoupler N1, and the other end of the second resistor R1 is connected between the first resistor R1 and the Cath end of the optocoupler N1. The optocoupler input circuit 1 adopts a resistor current limiting mode to connect a driving signal PWM_UH sent by the MCU with one end of the first resistor R1.
The under-voltage protection circuit 2 turns off the output pulse when the on-voltage of the collector of the triode V5 is lower than a threshold value, and the under-voltage protection circuit 2 comprises the triode V5, a first voltage stabilizing tube V1, a second voltage stabilizing tube V2, a third resistor R3, a fourth resistor R4, an eighth resistor R8, a second capacitor C2 and a third capacitor C3. The collector of triode V5 is connected with VCC port of opto-coupler N1, and triode V5's projecting pole is connected with power P15U, and triode V5's base, eighth resistance R8's one end, fourth resistance R4's one end are connected, and eighth resistance R8's the other end is connected with power P15U, and fourth resistance R4's the other end second regulator V2's negative pole is connected, and second regulator V2's positive pole is connected with first regulator V1's negative pole, and first regulator V1's positive pole is connected with power ground M15U. One end of the second capacitor C2 is connected with the collector electrode of the triode V5, and the other end of the second capacitor C2 is connected with the power supply ground M15U. One end of the third resistor R3 connected in parallel with the third capacitor C3 is connected with the VO end of the optocoupler N1, and the other end of the third resistor R is connected with the power ground M15U.
Taking the triode V5 of fig. 3 as an example for analysis, the voltage at point a between the base of the triode V5 and the first terminal of the eighth resistor R8 is denoted by Ud.
The undervoltage protection function specifically comprises the steps that when a power supply P15U works normally, a point A voltage Ud is in a threshold voltage range where a triode V5 is conducted, a collector of the triode V5 is conducted, an optocoupler N1 works normally, a VO end of the optocoupler N1 outputs a driving pulse, when the power supply P15U is undervoltage, in an undervoltage protection circuit, the point A voltage is obtained through voltage division of an eighth resistor R8 and a fourth resistor R4, the point A voltage is reduced, the point A voltage is lower than the threshold voltage range where the triode V5 is conducted, the collector of the triode V5 does not output voltage, a VCC port of the optocoupler N1 is not input with voltage, the VO end of the optocoupler N1 is not output with driving pulse, and an undervoltage protection signal is sent.
The negative-pressure turn-off circuit 3 includes a third voltage regulator V3, a fourth voltage regulator V4, a gate resistor R6, a seventh resistor R7, a fifth capacitor C5, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9. The first end of the gate resistor R6 is connected to the VO end of the optocoupler N1, and the second end of the gate resistor R6 outputs a driving signal. The cathode of the fourth voltage stabilizing tube V4 is connected with the second end of the grid resistor R6, the anode of the fourth voltage stabilizing tube V4 is connected with the anode of the third voltage stabilizing tube V3, and the cathode of the third voltage stabilizing tube V3 is connected with the ground UG. One end of the seventh resistor R7 and the ninth capacitor C9 connected in parallel is connected to the second end of the gate resistor R6, and the other end is connected to the ground UG. One end of the fifth capacitor C5, the seventh capacitor C7 and the eighth capacitor C8 which are connected in parallel is connected with the ground UG, the other end of the fifth capacitor C5 is connected with the power supply ground M15U, and the cathode of the first voltage stabilizing tube V1 is connected with the ground UG. One end of the fifth capacitor C5 is further connected with a sixth capacitor C6, the other end of the sixth capacitor C6 is connected with a power supply P15U, one end of the seventh capacitor C7 is further connected with a fifth resistor R5, and the other end of the fifth resistor R5 is connected with the power supply P15U. One end of the second capacitor C2 is also connected with the VCC port of the optical coupler N1, and the Vee port of the optical coupler N1 is connected with the power ground M15U.
The negative voltage turn-off circuit adopts a first voltage stabilizing tube V1, a third voltage stabilizing tube V3, a fourth voltage stabilizing tube V4, a power supply ground M15U, VCC, VO, vee ports of an optocoupler N1, a third resistor R3, a grid resistor R6 and a seventh resistor R7, and a second capacitor C2, a third capacitor C3, a fifth capacitor C5, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a ground UG form DC-5.1V as turn-off voltage of the IGBT.
In summary, the invention constructs the negative-pressure IGBT driving circuit with the undervoltage protection function based on discrete devices, has simple control circuit, reduces the cost and realizes 100% localization of the components.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and any equivalent embodiments that may be changed or modified into equivalent changes by those skilled in the art using the technical disclosure described above are applied to other fields, but any simple modification, equivalent changes and modification made to the above embodiments according to the technical solution of the present invention will still fall within the scope of the technical solution of the present invention, unless departing from the technical solution of the present invention.
Claims (2)
1. The method is characterized by comprising an optocoupler input circuit, an undervoltage protection circuit and a negative voltage turn-off circuit which are connected with each other;
The under-voltage protection circuit is characterized by comprising an optocoupler, a first resistor, a second resistor and a first capacitor, wherein one end of the first resistor is connected with a driving signal PWM_UH sent by the MCU, the other end of the first resistor is connected with a Cath end of the optocoupler, one end of the second resistor is connected with an Anode end of the optocoupler after being connected in parallel with the first capacitor, the other end of the second resistor is connected between the first resistor and the Cath end of the optocoupler, the under-voltage protection circuit comprises a triode, a first voltage stabilizing tube, a second voltage stabilizing tube, a third resistor, a fourth resistor, an eighth resistor, a second capacitor and a third capacitor, the optocoupler is connected with a port of the optocoupler, one end of the first resistor is connected with a driving signal PWM_UH sent by the MCU, the other end of the first resistor is connected with a Cath end of the optocoupler, one end of the second resistor is connected with an Anode end of the optocoupler after being connected in parallel with the first capacitor, and the other end of the voltage stabilizing tube is connected between the first resistor and the Cath end of the optocoupler, and the under-voltage protection circuit is integrated together, the under-voltage shutdown circuit is formed into a negative voltage as an off voltage, the turn-off voltage of the IGBT, the optocoupler is connected with the first resistor, the second resistor is connected with the second voltage.
2. The negative-voltage IGBT driving circuit with the undervoltage protection function based on the discrete device is characterized by comprising a third voltage stabilizing tube, a fourth voltage stabilizing tube, a grid resistor, a seventh resistor, a fifth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor, wherein a first end of the grid resistor is connected with a VO end of an optocoupler, a second end of the grid resistor outputs driving signals, a cathode of the fourth voltage stabilizing tube is connected with a second end of the grid resistor, an anode of the fourth voltage stabilizing tube is connected with an anode of the third voltage stabilizing tube, a cathode of the third voltage stabilizing tube is connected with ground, one end of the seventh resistor and one end of the ninth capacitor are connected with the second end of the grid resistor, the other end of the seventh capacitor and one end of the eighth capacitor are connected with ground, the other end of the seventh capacitor and one end of the eighth capacitor are connected with power ground, a cathode of the first voltage stabilizing tube is connected with ground, one end of the second capacitor is also connected with a VCC port of the optocoupler, and a Vee port of the optocoupler is connected with power ground;
The negative-voltage turn-off circuit adopts a first voltage stabilizing tube, a third voltage stabilizing tube, a fourth voltage stabilizing tube, power ground, VCC, VO, vee ports of an optocoupler, a third resistor, a grid resistor and a seventh resistor, and a DC-5.1V is formed by a second capacitor, a third capacitor, a fifth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and ground to serve as turn-off voltage of the IGBT.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311547695.0A CN117439588B (en) | 2023-11-20 | 2023-11-20 | Negative voltage IGBT drive circuit with undervoltage protection function based on discrete devices |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311547695.0A CN117439588B (en) | 2023-11-20 | 2023-11-20 | Negative voltage IGBT drive circuit with undervoltage protection function based on discrete devices |
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| CN117439588A CN117439588A (en) | 2024-01-23 |
| CN117439588B true CN117439588B (en) | 2025-01-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882860A (en) * | 2010-06-23 | 2010-11-10 | 山东大学威海分校 | Novel insulated gate bipolar translator (IGBT) drive and protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005367B2 (en) * | 1992-08-21 | 2000-01-31 | 三菱電機株式会社 | Drive circuit |
| CN101686044B (en) * | 2009-03-25 | 2011-10-26 | 深圳市科陆变频器有限公司 | IGBT drive protection circuit |
| CN201533295U (en) * | 2009-10-21 | 2010-07-21 | 深圳市麦格米特驱动技术有限公司 | IGBT drive and protection circuit |
| CN205847212U (en) * | 2016-07-08 | 2016-12-28 | 上海众联能创新能源科技股份有限公司 | A kind of IGBT drive circuit of high reliability |
| CN209218057U (en) * | 2018-12-18 | 2019-08-06 | 天津瑞能电气有限公司 | A kind of field-effect tube driving circuit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882860A (en) * | 2010-06-23 | 2010-11-10 | 山东大学威海分校 | Novel insulated gate bipolar translator (IGBT) drive and protection circuit |
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