CN215072346U

CN215072346U - IGBT drive circuit

Info

Publication number: CN215072346U
Application number: CN202120988731.7U
Authority: CN
Inventors: 张小辉; 黄日桓; 黄辉; 傅俊寅; 汪之涵
Original assignee: Shenzhen Bronze Sword Technology Co ltd
Current assignee: Shenzhen Bronze Sword Technology Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-12-07
Anticipated expiration: 2031-05-10

Abstract

The application discloses IGBT drive circuit, including processing control module, transformer, IGBT drive module, fault detection module and oscillation module. And the IGBT driving module is used for receiving the control signal which is output by the processing control module and transmitted by the transformer so as to drive or turn off the IGBT. The fault detection module is used for outputting a first fault signal of a single pulse to the oscillation module when the IGBT is in fault, the oscillation module is used for converting the first fault signal of the single pulse into a second fault signal of a continuous pulse and continuously transmitting the second fault signal to the processing control module through the transformer, and the processing control module continuously receives the second fault signal and outputs a control signal for turning off the IGBT according to the second fault signal. The circuit is simple in structure and high in reliability.

Description

IGBT drive circuit

Technical Field

The application relates to the technical field of electronics, especially, relate to an IGBT drive circuit.

Background

In recent years, as the IGBT integrates the advantages of a power MOSFET and a bipolar transistor, the IGBT has high-speed switching and voltage driving characteristics, and thus is rapidly developed in the field of power electronics. The drive circuit for normal operation of the IGBT needs to achieve reliable isolation between the control loop and the power loop. Common isolation methods of the IGBT driving circuit include transformer isolation and optical coupling isolation. When the IGBT breaks down, the fault signal can be transmitted to the IGBT processing control module through the transformer or through the optical coupler, and therefore the purpose of timely controlling the IGBT to be turned off is achieved.

However, the anti-interference capability of the transformer transmission is weak, and the conditions of pulse loss, weakening and the like often occur in the process of transmitting a single pulse fault signal through the transformer, so that the risk that the fault cannot be reported exists, and the working state of the IGBT is misjudged in serious cases, so that the IGBT is damaged. The anti-interference capability of the optical coupling transmission is relatively strong, but the space occupied by the optical coupling circuit is large, and the cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an IGBT driving circuit that can reliably output a fault signal and perform turn-off protection in time when an IGBT fails.

The technical scheme proposed by the application for achieving the purpose is as follows:

an IGBT driving circuit comprises a processing control module, a transformer, an IGBT driving module, an oscillation module and a fault detection module, wherein the primary side of the transformer is electrically connected with the processing control module, the secondary side of the transformer is electrically connected with the IGBT driving module, the IGBT driving module is used for receiving a control signal which is output by the processing control module and transmitted by the transformer so as to drive or turn off the IGBT, the oscillation module is electrically connected with the secondary side of the transformer, the fault detection module is electrically connected between the IGBT driving module and the oscillation module, the fault detection module is used for detecting the working state of the IGBT by the IGBT driving module and outputting a first fault signal of a single pulse to the oscillation module when the IGBT fails, and the oscillation module is used for converting the first fault signal of the single pulse into a second fault signal of a continuous pulse, and the second fault signal is continuously transmitted to the processing control module in a pulse form through the transformer, and the processing control module continuously receives the second fault signal and outputs a control signal for turning off the IGBT according to the second fault signal.

Further, the oscillation module may include an oscillator and a signal transmission unit electrically connected to the oscillator, the oscillator is electrically connected to the fault detection module, the signal transmission unit is electrically connected to a secondary side of the transformer, the oscillator is configured to receive a first fault signal of a single pulse transmitted by the fault detection module and oscillate the first fault signal of the single pulse to output a second fault signal of a continuous pulse to the signal transmission unit, and the signal transmission unit is configured to provide transmission power to transmit the second fault signal of the continuous pulse to the processing control module through the transformer.

Furthermore, the processing control module comprises a control unit and a signal processing unit, the control unit is electrically connected to the primary side of the transformer, one end of the signal processing unit is electrically connected to the control unit, the other end of the signal processing unit is electrically connected to the primary side of the transformer, the signal processing unit is used for converting a continuous second fault signal transmitted by the transformer into a corresponding square wave signal and transmitting the square wave signal to the control unit, and the control unit generates a control signal for turning off the IGBT according to the square wave signal.

Further, the signal processing unit includes a PNP triode (Q1), a resistor (R1), a resistor (R2), a capacitor (C1), and an inverter (INV1), wherein a base of the PNP triode (Q1) is connected to a primary side of the transformer through the resistor (R2), an emitter of the PNP triode (Q1) is electrically connected to a power supply (V1), a collector of the PNP triode (Q1) is grounded through the resistor (R1), a collector of the PNP triode (Q1) is also grounded through the capacitor (C1), a collector of the PNP triode (Q1) is also electrically connected to an input terminal of the inverter (INV1), and an output terminal of the inverter (INV1) is electrically connected to the control unit.

According to the IGBT driving circuit, the fault detection module and the oscillation module are arranged on the secondary side of the transformer, so that after the IGBT is detected to be in fault, a single-pulse first fault signal generated by the fault detection module can be converted into a continuous-pulse second fault signal, the second fault signal transmitted by the transformer can be continuously received by the processing control module on the primary side of the transformer, the situation that the single-pulse fault signal is lost and cannot be received can be avoided, and the IGBT is prevented from being damaged due to failure report of the fault. The application effectively improves the reliability of fault signal output, improves the stability of the driving circuit, and has simple structure, low cost and obvious effect.

Drawings

Fig. 1 is a block diagram of a preferred embodiment of an IGBT driver circuit provided in the present application.

Fig. 2 is a block diagram of a preferred embodiment of the oscillation module of the present application.

FIG. 3 is a circuit diagram of a preferred embodiment of the process control module of the present application.

Description of the main elements

IGBT drive circuit 100

Process control module 10

Control unit 12

Signal processing unit 14

Transformer 20

IGBT drive module 30

Fault detection module 40

Oscillating module 50

Oscillator 52

Signal transmission unit 54

Resistors R1 and R2

Capacitor C1

PNP triode Q1

Inverter INV1

Power supply V1

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1, the present application provides an IGBT driving circuit 100 for driving an Insulated Gate Bipolar Transistor (IGBT) 200 to operate, and when the IGBT fails, a fault signal can be reliably output, so as to achieve the purpose of reliable turn-off protection.

The IGBT driving circuit 100 includes a processing control module 10, a transformer 20, an IGBT driving module 30, a fault detection module 40, and an oscillation module 50. The process control module 10 is electrically connected to the primary side of the transformer 20. The IGBT driving module 30 and the oscillating module 50 are electrically connected to the secondary side of the transformer 20. The fault detection module 40 is electrically connected between the IGBT driving module 30 and the oscillation module 50. The IGBT driving module 30 is also used to connect an IGBT.

The IGBT driving module 30 is configured to receive a control signal output by the processing control module 10 and transmitted through the transformer 20, and drive or turn off the IGBT according to the control signal. The fault detection module 40 is configured to detect an operating state of the IGBT through the IGBT driving module 30, and output a single-pulse first fault signal to the oscillation module 50 when the IGBT fails, where the oscillation module 50 is configured to convert the single-pulse first fault signal into a continuous-pulse second fault signal, and continuously transmit the second fault signal to the processing control module 10 in a pulse form through the transformer 20. The processing and control module 10 continuously receives the second fault signal transmitted by the transformer 20, and outputs a control signal for turning off the IGBT according to the second fault signal. In this way, the IGBT driving module 30 receives the control signal output by the processing control module 10 and transmitted through the transformer 20, so as to turn off the IGBT.

In this way, by arranging the fault detection module 40 and the oscillation module 50 on the secondary side of the transformer 20, when the IGBT fails, a fault signal can be continuously transmitted to the primary processing control module 10 through the transformer 20, so that the situation that a monopulse signal cannot be transmitted in the transmission process of the transformer 20, such as loss, interference, attenuation, and the like, is effectively reduced, the risk that a fault cannot be reported is further avoided, and the reliability of fault output is improved.

Referring to fig. 2, the oscillation module 50 may include an oscillator 52 and a signal transmission unit 54 electrically connected to the oscillator 52. The oscillator 52 is electrically connected to the fault detection module 40. The signal transmission unit 54 is electrically connected to the secondary side of the transformer 20. The oscillator 52 is configured to receive the single-pulse first fault signal transmitted by the fault detection module 40, and oscillate the single-pulse first fault signal to output a continuous-pulse second fault signal to the signal transmission unit 54. The signal transmission unit 54 is configured to provide transmission power to transmit the second fault signal of the continuous pulse to the process control module 10 through the transformer 20.

Referring to fig. 3, the processing control module 10 may include a control unit 12 and a signal processing unit 14. The control unit 12 is electrically connected to the primary side of the transformer 20. One end of the signal processing unit 14 is electrically connected to the control unit 12, and the other end of the signal processing unit 14 is electrically connected to the primary side of the transformer 20. The signal processing unit 14 is configured to convert the continuous second fault signal transmitted by the transformer 20 into a corresponding square wave signal, and transmit the square wave signal to the control unit 12. The control unit 12 generates a control signal for turning off the IGBT according to the square wave signal.

In this embodiment, the signal processing unit 14 includes a PNP transistor Q1, a resistor R1, a resistor R2, a capacitor C1, and an inverter INV 1. The base of the PNP transistor Q1 is connected to the primary side of the transformer 20 through the resistor R2. The emitter of the PNP transistor Q1 is electrically connected to the power supply V1. The collecting electrode of PNP triode Q1 passes through resistance R1 ground connection, PNP triode Q1's collecting electrode still passes through electric capacity C1 ground connection, PNP triode Q1's collecting electrode still with the input electricity of inverter INV1 is connected. An output end of the inverter INV1 is electrically connected to the control unit 12.

The IGBT driving circuit 100 is configured with the fault detection module 40 and the oscillation module 50 on the secondary side of the transformer 20, so that after the IGBT is detected to have a fault, the first fault signal of the single pulse generated by the fault detection module 40 can be converted into the second fault signal of the continuous pulse, and thus, the processing control module 10 can be ensured to continuously receive the second fault signal transmitted by the transformer 20 on the primary side of the transformer 20, and thus, the situation that the fault signal of the single pulse is lost and cannot be received can be avoided, and the IGBT damage caused by failure of fault report can be avoided. The application effectively improves the reliability of fault signal output, improves the stability of the driving circuit, and has simple structure, low cost and obvious effect.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An IGBT driving circuit comprises a processing control module, a transformer and an IGBT driving module, wherein the primary side of the transformer is electrically connected with the processing control module, the secondary side of the transformer is electrically connected with the IGBT driving module, the IGBT driving module is used for receiving a control signal which is output by the processing control module and transmitted by the transformer so as to drive or turn off the IGBT, the IGBT driving circuit is characterized by further comprising an oscillation module and a fault detection module, the oscillation module is electrically connected with the secondary side of the transformer, the fault detection module is electrically connected between the IGBT driving module and the oscillation module, the fault detection module is used for detecting the working state of the IGBT by the IGBT driving module and outputting a first fault signal of a single pulse to the oscillation module when the IGBT fails, and the oscillation module is used for converting the first fault signal of the single pulse into a second fault signal of a continuous pulse, and the second fault signal is continuously transmitted to the processing control module in a pulse form through the transformer, and the processing control module continuously receives the second fault signal and outputs a control signal for turning off the IGBT according to the second fault signal.

2. The IGBT driving circuit according to claim 1, wherein the oscillating module includes an oscillator and a signal transmission unit electrically connected to the oscillator, the oscillator is electrically connected to the fault detection module, the signal transmission unit is electrically connected to the secondary side of the transformer, the oscillator is configured to receive a first fault signal of a single pulse transmitted by the fault detection module and oscillate the first fault signal of the single pulse to output a second fault signal of a continuous pulse to the signal transmission unit, and the signal transmission unit is configured to provide transmission power to transmit the second fault signal of the continuous pulse to the processing control module through the transformer.

3. The IGBT driving circuit according to claim 1, wherein the processing control module comprises a control unit and a signal processing unit, the control unit is electrically connected to the primary side of the transformer, one end of the signal processing unit is electrically connected to the control unit, the other end of the signal processing unit is electrically connected to the primary side of the transformer, the signal processing unit is configured to convert a continuous second fault signal transmitted from the transformer into a corresponding square wave signal and transmit the square wave signal to the control unit, and the control unit generates a control signal for turning off the IGBT according to the square wave signal.

4. The IGBT driving circuit according to claim 3, wherein the signal processing unit comprises a PNP transistor (Q1), a resistor (R1), a resistor (R2), a capacitor (C1) and an inverter (INV1), wherein a base of the PNP transistor (Q1) is connected to the primary side of the transformer through the resistor (R2), an emitter of the PNP transistor (Q1) is electrically connected to the power supply (V1), a collector of the PNP transistor (Q1) is connected to the ground through the resistor (R1), a collector of the PNP transistor (Q1) is also connected to the ground through the capacitor (C1), a collector of the PNP transistor (Q1) is also electrically connected to an input terminal of the inverter (INV1), and an output terminal of the inverter (INV1) is electrically connected to the control unit.