Electrifying buffer circuit and electrombile motor control system

Abstract

The invention provides an electrifying buffer circuit and an electrombile motor control system. The electrifying buffer circuit comprises a digital signal processor, an MOSFET drive circuit, a voltage sampling circuit and a buffer power loop. The buffer power loop comprises a power resistor and an MOSFET. The voltage sampling circuit is used for sampling the voltage across the two ends of a main contactor. The digital signal processer is used for sending drive signals to the MOSFET drive circuit to drive the MOSFET to be connected when a buffer electrifying instruction is received and the sampled voltage meets the buffer start starting conditions; when the sampled voltage meets the buffer start finishing conditions, the digital signal processer stops sending the drive signals to the MOSFET drive circuit, and after a Cgs of the MOSFET finishes discharging, signals enabling the main contactor to be closed are output. According to the electrifying buffer circuit and the electrombile motor control system, through the strong overload capacity of the MOSFET, a buffer contactor can be effectively replaced to achieve fast electrifying of capacitive load of a main loop of an electrombile power system.

Description

technical field [0001] The invention relates to the field of motor control, and more specifically relates to a power-on buffer circuit and a motor control system for an electric vehicle. Background technique [0002] After more than ten years of development, China's electric vehicle industry has formed a large-scale industrial group from small to large. Especially after entering the 21st century, the entire industry has shown a trend of rapid development. [0003] At present, in the motor control system of most electric vehicles in China, the main contactor needs to be connected in series in the main circuit of the power system to ensure the safety of the system. . In order to overcome the inrush current generated by the capacitive load when the high voltage difference occurs, the power-on buffer contactor is usually connected in parallel at both ends of the main contactor to avoid the adhesion of the main contactor. [0004] The above solution has a simple structure, but ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a power-on buffer circuit and an electric vehicle motor control system for the problems of low reliability and low power density of the power-on buffer structure of the above-mentioned motor control system

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