Pre-charging device of motor controller

A motor controller and pre-charging technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems affecting normal driving of vehicles, inconvenience of driving vehicles, contact Oxidation and other problems, to achieve the effect of shortening the pre-charging time, stable and reliable performance, and convenient driving
CN104348145AInactive Publication Date: 2015-02-11SHENZHEN ZHONGDE CENTURY NEW ENERGY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN ZHONGDE CENTURY NEW ENERGY
Publication Date
2015-02-11
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention provides a pre-charging device of a motor controller. The pre-charging device is applied to the motor controller of an electric vehicle. The pre-charging device comprises a power battery, a supporting capacitor, a contactor and a pre-charging circuit, wherein the contactor and the pre-charging circuit are arranged between a positive electrode of the power battery and a positive electrode of the supporting capacitor; the pre-charging circuit comprises a sequential control circuit and a pre-charging path; the pre-charging path comprises first and second pre-charging paths consisting of two MOS (Metal Oxide Semiconductor) transistors; the sequential control circuit is used for controlling sequential switch-on of the two MOS transistors. Through sequential switch-on of the first and second pre-charging paths, the supporting capacitor is charged. The pre-charging time is effectively shortened to facilitate driving; a conventional relay is substituted by using the MOS transistors, so that the performance is more stable and reliable.
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Description

technical field

[0001] The invention relates to a motor controller of an electric vehicle, in particular to a pre-charging device of the motor controller. Background technique

[0002] In power electronics, when charging a capacitor, due to a sudden change in the voltage across the capacitor, an instantaneous large current will be generated at the beginning of charging. This current may cause high-voltage breakdown of the capacitor, and may also cause damage to the drive motor controller. damage to the circuit. Therefore, a pre-charging circuit is usually added to the high voltage or high current. Its main function is to limit the large current impact on the supporting capacitor when the power is turned on. It is mainly to slowly charge the supporting capacitor to a certain level before the main contactor is turned on. Voltage. For the inside of the drive motor controller, the pre-charging device can slow down the impact of high current on the internal circuit of the drive...

Claims

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