Power-off protection circuit for low-speed electromobile controller

Abstract

The invention discloses a power-off protection circuit for a low-speed electromobile controller. The power-off protection circuit comprises a power supply, an external switch, a capacitive pre-charging circuit, a driving system, a contactor control circuit and a contactor main contact, wherein the power supply is connected with the external switch and with the capacitive pre-charging circuit, andthe capacitive pre-charging circuit is located below the external switch to provide power. The external switch can be always closed in the daily use process of the low-speed electromobile and cannot be turned off by the low-speed electromobile controller. When the driving system has abnormal conditions such as short circuit, the system does not have the capability of actively cutting off a strongelectric power supply to effectively protect the whole electromobile driving control system.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a low-speed electric vehicle controller power-off protection circuit. Background technique [0002] The existing electric vehicle controller does not protect the drive power supply system in the controller itself. The strong battery power is directly supplied to the drive power of the controller. Because the capacitor is charged, a large pulse current will be generated at the moment of power-on, which will affect the capacitor. At the same time, the service life will have an impact on the power devices, and the drive power supply in the prior art is uncontrollable. When dangerous conditions such as overcurrent and short circuit occur in the drive system, timely and effective protection cannot be carried out. [0003] In prior art solutions, the power supply directly supplies power to the drive system through an external switch, which is manually controlled. In this solution, the power sup...

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Problems solved by technology

In this solution, the power supply is directly loaded to the drive system after the switch is closed. Since there are many bus capacitors connected in parallel in the drive system and the capacitance is large, a very large peak current will be generated at the moment of power-on, which will affect the life of the electrolytic capacitor. It will also damage the power devices in the drive system

[0004] In the existing scheme, once the external switch is closed, the drive system will always have strong electricity, because the external switch is always closed during the daily use of the low-speed electric vehicle, and the low-speed electric vehicle controller cannot shut it down. In case of abnormal conditions such as short circuit, the system has no ability to actively cut off the strong power supply to effectively protect the entire electric vehicle drive control system

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