A vehicle-mounted charging system for electric vehicles

Abstract

The invention provides a vehicle-mounted charging system of an electromobile. The vehicle-mounted charging system comprises a digital signal processor (DSP) chip and a DSP peripheral circuit and also comprises an input AC undervoltage detection circuit, a charging output polarity detection circuit, a battery voltage detection circuit, a charging voltage detection and fault-tolerant circuit and a charging current detection and fault-tolerant circuit, wherein safe and rapid charging voltage and current are comprehensively made according to self-detection results of all unit circuits and a detection result of an electromobile body controller module, and self-detection data and execution data are uploaded to a an ECU or a central control instrument screen in the electromobile for display through a CAN bus. By the vehicle-mounted charging system, the problems of simple functions and incapability of intelligently cooperating with an electromobile electric management module for charging in the prior art are solved, charging voltage / current is accurately judged through acquiring two-path simulation signals output from the charging voltage / current detection and fault-tolerant circuit by a DSP chip through an analog-to-digital converter (ADC), a corresponding charging method / constant current value charging is made by the DSP chip according to a result, and the battery is ensured to be prevented from being damaged due to voltage overcharging.

Description

technical field [0001] The invention relates to a new energy electric vehicle charging system, in particular to an intelligent, safe and efficient electric vehicle charging system. Background technique [0002] An electric vehicle is a vehicle driven by electricity and powered by electricity. An electric vehicle usually consists of power storage battery, electric motor, motor controller, charger, DC converter, instrumentation and vehicle body. The cruising range and battery life of an electric vehicle depend on the intelligence of the charger and the precision of digital control. [0003] At present, most of the chargers for electric vehicles on the market use open-loop charging, which can easily lead to battery damage and fire. Because the vehicle is a sports product, the working environment and road conditions are complex, which may easily lead to serious safety hazards such as loose battery connection wires and broken wires, resulting in poor contact and leakage. [00...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the chargers for electric vehicles on the market use open-loop charging, which can easily lead to battery damage and fire.

Because the vehicle is a sports product, the working environment and road conditions are complex, which may easily lead to loose battery connection wires and broken wires, resulting in poor contact and leakage and other serious safety hazards.

[0004] Moreover, the functional design is single, and it fails to fully consider the electrical conditions of the whole vehicle and the safe and fast charging control logic; there are also problems such as low power density, the need to configure fans for heat, and short life.

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