Active discharge circuit and power electronic equipment

A technology of discharge circuit and discharge resistor, applied in the field of electronic power, can solve the problems of large heat dissipation space, large volume of discharge resistor and high cost, and achieve the effect of reducing heat dissipation space, reducing cost and volume, and avoiding burning

Pending Publication Date: 2020-03-27
SUZHOU INOSA UNITED POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention aims at the problems that when the DC bus capacitor is connected in parallel at both ends of the discharge resistor, the power to the discharge

Method used

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  • Active discharge circuit and power electronic equipment
  • Active discharge circuit and power electronic equipment
  • Active discharge circuit and power electronic equipment

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] figure 1 It is the active discharge circuit proposed by the embodiment of the present invention, and the active discharge circuit can be used to discharge the DC bus capacitor C1 connected between the positive bus and the negative bus in the driving device. The active discharge circuit includes a control unit 10, a switch tube Q1, a discharge resistor RL and a drive branch 20, and the switch tube Q1 and the discharge resistor RL are connected in...

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PUM

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Abstract

The embodiment of the invention discloses an active discharge circuit and power electronic equipment. The active discharge circuit is used for discharging a direct current bus capacitor connected between a positive bus and a negative bus in a driving device. The active discharge circuit comprises a control unit, a switch tube and a discharge resistor, and the switch tube and the discharge resistorare connected in series and then are connected with the direct current bus capacitor in parallel; the active discharge circuit also comprises a driving branch circuit. The control unit is connected to the control end of the switch tube through the driving branch, and when the control unit outputs a discharge signal or the control unit fails, the driving branch drives the switch tube to be switched on in a preset mode according to the voltage at the two ends of the direct-current bus capacitor so as to prevent the discharge resistor from being burnt out.

Description

technical field [0001] Embodiments of the present invention relate to the field of electronic power, in particular to an active discharge circuit and power electronic equipment. Background technique [0002] The motor controller is the key unit in the electric vehicle. In the motor controller, the DC bus capacitor is used as the input of the inverter, and the inverter outputs three-phase AC to drive the permanent magnet synchronous motor, thereby driving the electric vehicle to run normally. When parking, vehicle collision or controller failure, the contactor between the bus capacitor and the battery will be disconnected. Since there is still high voltage on the bus capacitor, if it is not released in time, it will bring safety risks to personnel. For the sake of safety, in the above cases, the voltage at both ends of the DC bus capacitor is generally reduced to below 60V through an active discharge circuit. Commonly used active discharge circuit forms include bridge arm th...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L15/00
CPCB60L15/00B60L3/0084
Inventor 彭俊伟王艳龙
Owner SUZHOU INOSA UNITED POWER SYST CO LTD
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