High-voltage DC stepped constant current closed-loop pre-charging circuit

Abstract

The invention discloses a module of a high-voltage direct current stepped constant-current closed-loop pre-charging circuit, which includes: a power tube control and current sampling module, a constant-current closed-loop drive circuit module, an MCU micro-control processing module, and a current reference generation module; The tube control and current sampling module is used to control the gate of the power tube and sample the charging current, and send the sampling result to the constant current closed-loop drive circuit module; the current reference generation module is used to send the constant current closed-loop drive circuit module Charging current reference; constant current closed-loop drive circuit module, used to control the gate voltage of the power tube and the power tube of the current sampling module through analog PID according to the charging current reference and sampling results of the current reference generation module; MCU controller processing module, It is used to control the current reference generation module and the constant current closed-loop drive 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 larger volume and higher cost;

[0006] c. The degree of informatization is low, which is not conducive to the improvement of the degree of informatization of the whole vehicle

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