High-voltage DC stepped constant current closed loop precharge circuit

Abstract

The invention discloses a high-voltage DC stepped constant current closed loop precharge circuit, which comprises a power transistor control and current sampling module, a constant current closed loopdriving circuit module, an MCU microcontroller processing module and a current reference generation module, wherein the power transistor control and current sampling module is used for gate control of the power transistor and sampling of charging current and a sampling result is sent to the constant current closed loop driving circuit module; the current reference generation module is used for sending charging current reference to the constant current closed loop driving circuit module; the constant current closed loop driving circuit module is used for controlling the gate voltage of the power transistor of the power transistor and current sampling module through simulating PID according to the charging current reference of the current reference generation module and the sampling result;and the MCU controller processing module is used for controlling the current reference generation module and the constant current closed loop driving circuit module.

Description

technical field [0001] The invention belongs to the field of electronic control of new energy vehicles, and in particular relates to a high-voltage direct current stepped constant current closed-loop precharging method. Background technique [0002] With the increasing energy crisis and environmental pollution, new energy vehicle technology has sprung up into the fast lane of vigorous development, and the development of new energy vehicles with high efficiency, energy saving and low noise has become an inevitable trend for the development of domestic and foreign automobile companies. In order to improve the power of new energy vehicles and reduce the weight of vehicle cables, the voltage of new energy vehicles has increased from 12V / 24V of traditional vehicles to the current hundreds of volts. At the same time, the motor controller of new energy vehicles and other high-voltage electronic controllers Large-capacity high-voltage capacitors are often integrated, ranging from hu...

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Problems solved by technology

[0005] b. The integration level is low, and it needs to cooperate with external voltage and current sensors to realize overvoltage and overcurrent protection, resulting in

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