High-voltage capacitor discharging device, method thereof and vehicle

Abstract

A high-voltage capacitor discharging device comprises a motor control module, a motor driving module and a motor, wherein the motor driving module is connected with a high-voltage capacitor, the motor control module and the motor respectively. The motor control module is used for controlling the motor driving module to enable the high-voltage capacitor to output q-shaft current Iq and d-shaft current Id upon reception of a high-voltage outage signal, and the output q-shaft current Iq and the output d-shaft current Id enable the motor not to be in a rotating state. The high-voltage capacitor discharging device enables the charge of the high-voltage capacitor to be automatically discharged via consumption of the motor, but does not lead the motor to run.

Description

technical field [0001] The invention belongs to the field of high-voltage capacitors, and in particular relates to a high-voltage capacitor charge discharge device, a method thereof, and a vehicle. Background technique [0002] When the vehicle is powered off at high voltage (for example, in abnormal situations such as a vehicle collision), there is a large amount of charge in its high-voltage capacitor. If the charge cannot be quickly discharged, it will cause a certain safety hazard to the vehicle. [0003] In the prior art, there are generally two ways to discharge the charge in the high-voltage capacitor: one is to connect a power resistor with a relatively large impedance in parallel on the high-voltage circuit, and the resistor will discharge it through its own heat as long as there is power on the high-voltage circuit. When the high-voltage power is cut off, the resistor will generally release the charge in the high-voltage capacitor within a long period of time. Ther...

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Problems solved by technology

[0003] In the prior art, there are generally two ways to discharge the charge in the high-voltage capacitor: one is to connect a power resistor with a relatively large impedance in parallel on the high-voltage circuit, and the resistor will discharge it through its own heat as long as there is power on the high-voltage circuit. When the high-voltage power is cut off, the resistor will generally release the charge in the high-voltage capacitor within a long period of time. There are two defects in this method. One is that as long as the high-voltage circuit has power, the resistor will discharge The release will continue to consume energy. The second is that the release takes a long time and does not meet the relevant safety requirements; the other is to add a switch on the basis of passive release, and only control the switch when it is necessary to release The disadvantage of this method is that it not only requires a set of independent control circuit to control the discharge switch, but also needs a set of independent power supply circuit that takes power from the high-voltage capacitor to provide work for the control circuit. Power supply, which makes the circuit more complicated, which not only increases the space, but also increases the cost

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