IGBT drive circuit for motor controller, and motor controller

Patent metadata

Field	Value
Publication number	US-11323112-B2
Application number	US-201916963632-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Mar 8, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

The present disclosure discloses an IGBT driving circuit for an electric-motor controller and an electric-motor controller. The IGBT driving circuit includes: a function safety circuit provided on a driver board of the electric-motor controller, and a detection feedback circuit and a pulse-width-modulation (PWM) buffer circuit that are connected to the function safety circuit. The detection feedback circuit is configured to detect an IGBT module of the electric-motor controller, and when a specified malfunction of the IGBT module is detected, send a specified-malfunction signal to the function safety circuit. The function safety circuit is configured to judge according to a preset malfunction treating rule and the received specified-malfunction signal, and then output a corresponding controlling signal to the PWM buffer circuit. The PWM buffer circuit is configured to generate according to the corresponding controlling signal a PWM signal that drives the IGBT module, to control ON/OFF of the IGBT module to protect the IGBT module. The technical solutions of the present application have multiple functions of protection, which improves the stability and the safety of the IGBT, and has quick action and timely protection.

First claim

What is claimed is:

1. An IGBT driving circuit for an electric-motor controller, wherein the IGBT driving circuit comprises: a function safety circuit provided on a driver board of the electric-motor controller, and a detection feedback circuit and a pulse-width-modulation (PWM) buffer circuit that are connected to the function safety circuit;
the detection feedback circuit is configured to detect fault and malfunction of an IGBT module of the electric-motor controller, and when a specified fault or malfunction of the IGBT module is detected, send a specified-malfunction signal to the function safety circuit;
the function safety circuit is configured to judge according to a preset malfunction treating rule and the received specified-malfunction signal, and then output a corresponding controlling signal to the PWM buffer circuit; and
the PWM buffer circuit is configured to generate according to the corresponding controlling signal a PWM signal that drives the IGBT module, to control ON/OFF of the IGBT module to protect the IGBT module,
the IGBT driving circuit further comprises: an isolating driving power-supply circuit; and
the isolating driving power-supply circuit is configured to receive the PWM signal outputted by the PWM buffer circuit, and isolate the PWM signal,
the isolating driving power-supply circuit comprises: an isolating transformer and an isolating driving optical coupler;
the isolating transformer has an input end connected to a power supply of the driver board of the electric-motor controller, and an output end connected to the isolating driving optical coupler;
the isolating driving optical coupler has an input end connected to the PWM buffer circuit, and an output end connected to the IGBT module, and is configured to isolate the PWM signal and output the PWM signal to the IGBT module; and
the isolating driving optical coupler is further configured to detect a voltage between an emitter and a collector of the IGBT module, and when it is detected that the IGBT module is having a short trouble or a driving-voltage-undervoltage malfunction, feed back a short-trouble signal or a driving-voltage-undervoltage-malfunction signal to the function safety circuit.

2. The IGBT driving circuit for an electric-motor controller according to claim 1 , wherein the detection feedback circuit comprises: a temperature detection feedback circuit, a bus-voltage detection feedback circuit and a power-supply-voltage detection feedback circuit;
the temperature detection feedback circuit is configured to detect a temperature value of the IGBT module, and when the temperature value exceeds a preset temperature threshold, determine that the IGBT module is having an over-temperature malfunction and feed back an over-temperature-malfunction signal to the function safety circuit, to cause the function safety circuit to control to shut off the IGBT module;
the bus-voltage detection feedback circuit is configured to detect a bus-voltage value of the IGBT module, and when it is determined that a bus-voltage-overvoltage malfunction happens, feed back a bus-voltage-overvoltage-malfunction signal to the function safety circuit, to cause the function safety circuit to control to shut off the IGBT module; and
the power-supply-voltage detection feedback circuit is configured to detect a voltage value of a power supply of the driver board of the electric-motor controller, and when it is determined that a power-supply-voltage-undervoltage malfunction happens, feed back a power-supply-voltage-undervoltage-malfunction signal to the function safety circuit, to cause the function safety circuit to control to shut off the IGBT module.

3. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 2 .

4. The IGBT driving circuit for an electric-motor controller according to claim 1 , wherein the function safety circuit is configured to receive an actively short-circuiting signal from a control board of the electric-motor controller, and control according to the actively short-circuiting signal the PWM buffer circuit to generate a PWM signal, to control to shut off the IGBT module.

5. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 4 .

6. The IGBT driving circuit for an electric-motor controller according to claim 1 , wherein the function safety circuit is configured to receive a PWM enabling signal from a control board of the electric-motor controller, and according to the PWM enabling signal, cause the PWM buffer circuit to or not to output a PWM signal.

7. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 6 .

8. The IGBT driving circuit for an electric-motor controller according to claim 1 , wherein
the IGBT driving circuit further comprises: a redundant buffer circuit; and
the redundant buffer circuit is configured to receive malfunction signals that are generated when the IGBT module is having malfunctions, buffer the received one or more malfunctions, and then send them to a control board of the electric-motor controller, for the control board of the electric-motor controller to make judgement.

9. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 8 .

10. The IGBT driving circuit for an electric-motor controller according to claim 1 , wherein
the IGBT driving circuit further comprises: a push-pull amplifier circuit; and
the push-pull amplifier circuit is connected to the isolating driving power-supply circuit and the IGBT module, and is configured to amplify the received PWM signal and output it to the IGBT module.

11. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 10 .

12. The IGBT driving circuit for an electric-motor controller according to claim 1 , wherein
the isolating driving optical coupler has a flyback controller; and
the power supply of the driver board of the electric-motor controller is a Sepic power supply that outputs a 15V voltage.

13. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 12 .

14. An electric-motor controller, wherein the electric-motor controller comprises the IGBT driving circuit according to claim 1 .

Assignees

• Jing Jin Electric Tech Co Ltd

Inventors

• Gu Dongping
• Wan Fuxiang
• Dong Renjun

Classifications

• H03F1/52

  Circuit arrangements for protecting such amplifiers {(monitoring arrangements G01R31/28; increasing reliability in communication systems, e.g. using redundancy H04B1/74)} · CPC title

• H02H7/1225 Primary

  responsive to internal faults, e.g. shoot-through (avoiding shoot-through H02M1/38) · CPC title

• H03F2200/534

  Transformer coupled at the input of an amplifier · CPC title

• H02P29/024

  Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load · CPC title

• H02P29/026

  the fault being a power fluctuation · CPC title