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A bus capacitor active discharge circuit

A bus capacitor and discharge circuit technology, applied in the electric drive field of new energy vehicles, can solve problems such as high cost requirements of discharge resistors, and achieve the effects of reducing the risk of failure, reducing current overshoot, and ensuring service life

Active Publication Date: 2021-11-12
JEE AUTOMATION EQUIP SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution uses a discharge resistor for discharge, and usually adds an IGBT to control the start of the discharge, adding a part of the circuit, and the selection of the discharge resistor has higher cost requirements

Method used

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  • A bus capacitor active discharge circuit
  • A bus capacitor active discharge circuit
  • A bus capacitor active discharge circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Embodiment: This application provides a bus capacitor active discharge circuit, combined with reference figure 2 and image 3 , the bus capacitor active discharge circuit includes: a DC power supply UDC, a bus capacitor C1, a drive power circuit, a control circuit, an IGBT module, and a motor controller M.

[0026] The bus capacitor C1 is connected to the positive and negative DC bus between the DC power supply UDC and the IGBT module; the IGBT module includes a driver chip, a gate resistor and an inverter.

[0027] Each switching device in the inverter includes an insulated gate bipolar transistor IGBT or other power semiconductor switching devices, and each IGBT includes a reverse blocking diode; each IGBT in the inverter corresponds to a group of driver chips and gate resistors, The output end of the drive chip is connected to the gate of the IGBT through the gate resistor; the control circuit is connected to each drive chip; the output end of the drive power circu...

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PUM

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Abstract

The invention discloses a bus capacitor active discharge circuit, comprising: a DC power supply, a bus capacitor, a driving power circuit, a control circuit, an IGBT module, and a motor controller; bus; the IGBT module includes a driver chip, a gate resistor and an inverter; the output terminal of the driver chip is connected to the gate of the IGBT through the gate resistor; the control circuit is connected to each driver chip; the output terminal of the drive power circuit is connected to the inverter One of the phases of the upper bridge is connected to the input end of the driver chip; the output end of the inverter is connected to the input end of the motor controller. Control the gate voltage of the IGBT through a small peripheral circuit module, so that the IGBT module only works in the linear region during the conduction process, reducing the current overshoot of the IGBT module during the conduction process, ensuring the life of the IGBT, and reducing the IGBT Risk of failure during discharge.

Description

technical field [0001] The invention belongs to the technical field of electric drive of new energy vehicles, and in particular relates to an active discharge circuit for bus capacitors. Background technique [0002] Due to the rapid development of new energy vehicles, the performance requirements of automotive electronics are getting higher and higher, especially the safety protection strategy of the motor to the controller is becoming more and more stringent. New energy vehicles are loaded with a large high-voltage battery in real time. Only by maximizing high-voltage safety protection can new energy vehicles be safe and reliable. When the vehicle stops working, the battery is disconnected from the motor controller. Due to the large bus capacitance, the entire controller is still in a high voltage state. When the vehicle encounters a fault or normal maintenance, the higher bus voltage It will cause great danger to human life. Therefore, a certain active discharge method i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04
CPCH02H9/045
Inventor 刘蕾张守先张林郭燕齐
Owner JEE AUTOMATION EQUIP SHANGHAI CO LTD
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