A conductive charging system AC and DC charging control pilot circuit and control method thereof

Abstract

The invention discloses an alternating current / direct current charging control guiding circuit of an electric vehicle conduction charging system and a control method of the circuit. The alternating current / direct current charging control guiding circuit includes four parts including a power source waking and self-locking circuit, a CC / CC2 resistance detection circuit, a CP signal processing circuit and a microcontroller. The alternating current / direct current charging control guiding circuit has the advantages that the stand-by power consumption is low, delayed power failure can be achieved, an alternating current / direct current charging control guidance mode and a normal vehicle running guidance mode are both compatible, there are no mechanical contact points, and the service life is long. The provided alternating current / direct current charging control guiding circuit of the conduction charging system is usually integrated in a battery management system or a vehicle control unit. Switch devices adopted in the design are all MOS components, mechanical losses are avoided, the service life of a switch is prolonged, and the reliability of the alternating current / direct current charging control guiding circuit is improved.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and in particular relates to an AC / DC charging control guide circuit and a control method for a conduction charging system of an electric vehicle. Background technique [0002] Energy shortage and environmental pollution are serious challenges to my country's sustainable economic development, and it is imperative to develop green transportation. "Pure electric drive" is the strategic orientation of my country's automobile industry. How to ensure the safe and reliable connection between electric vehicles and charging equipment is one of the basic functional requirements of electric vehicles. Therefore, the design of a charger interface guide circuit that meets the requirements of the national standard and is compatible with the AC charging mode and the DC charging mode is an important guarantee for the safe and reliable driving of the vehicle. [0003] The purpose of AC and DC charging control gu...

AI Technical Summary

Problems solved by technology

[0006] In order to realize the above-mentioned conduction charging system AC / DC charging control guiding function stipulated by the national standard, the existing charging control guiding circuit and its control method have the following characteristics: 1. A single-chip microcomputer is used to monitor in real time whether the vehicle plug is connected to the vehicle socket, causing The standby power consumption of the system is relatively high; 2. When the charging is completed or the vehicle key switch is switched from ON to OFF, the vehicle controller will be powered off directly or the super capacitor will be used to delay the power-off, which cannot realize power-down data storage with high reliability; 3. The AC and DC charging control and pilot circuits are independently designed, and the compatibility is poor

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