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Discharging method of bus capacitor for electric automobile

A technology of bus capacitors and capacitors, which is applied in the discharge field of bus capacitors for electric vehicles, can solve the problems of increasing costs and achieve low cost effects

Active Publication Date: 2014-04-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the existing bus capacitor discharge method mentioned in the background technology, it is necessary to design a discharge circuit and increase the cost; at the same time, the permanent magnet synchronous motor of the new energy vehicle will charge the bus capacitor during the rotation process, resulting in a potential high voltage risk. The invention proposes a method for discharging busbar capacitors used in electric vehicles

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  • Discharging method of bus capacitor for electric automobile
  • Discharging method of bus capacitor for electric automobile
  • Discharging method of bus capacitor for electric automobile

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Embodiment Construction

[0021] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0022] figure 1 is a schematic diagram of the electric drive system provided by the present invention, such as figure 1 In the electric drive system shown, there is a main contactor between the battery and the motor controller to disconnect the high-voltage output of the battery and control the high-voltage risk area. The control and detection of the main contactor are completed by the battery management system. The battery management system needs to send the state of the main contactor of the battery to the motor controller.

[0023] When the motor controller detects a discharge command or requires discharge due to its own fault, it judges whether to activate the discharge function by checking the state of the main ...

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Abstract

The invention discloses a discharging method of a bus capacitor for an electric automobile, and belongs to the technical field of power electronics. According to the discharging method, by controlling switching on and switching off of a power module, charges stored in the bus capacitor are rapidly consumed on the power module. No additional parts are added, and on the premise that cost is reduced, discharging of the bus capacitor can be rapidly completed; meanwhile, three lower half bridge arms are in a switched on state in the discharging process, a motor is in a three-phase short-circuit state at the moment, and therefore reverse phase electromotive force can not be generated on a direct-current bus, and the problem that the bus capacitor is charged in the rotating process of a permanent magnetic synchronous motor of the new-energy automobile is solved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to a method for discharging bus capacitors used in electric vehicles. Background technique [0002] In new energy vehicles, an electric drive system is added to the transmission system or the transmission system is completely replaced by an electric drive system in order to obtain better emissions and fuel consumption. A general electric drive system consists of a battery / motor / motor controller. The power part of the motor controller consists of power electronic components such as bus capacitors, three-phase full-bridge power modules, and absorption circuits. The function of the bus capacitor is filtering to smooth the bus voltage. When the rated voltage of the electric drive system exceeds 60V, even if the battery is disconnected from the high-voltage circuit, the capacitor has a high voltage risk to the operator or maintenance personnel due to the energy storage charac...

Claims

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Application Information

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IPC IPC(8): B60L15/00B60L3/00
Inventor 田光宇任晨佳程潇骁陈红旭
Owner TSINGHUA UNIV
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