Auxiliary circuit, system and control method for electric vehicle DC charging control and guidance

Abstract

An electric vehicle direct current charging control guiding auxiliary circuit, comprising a connection interface (1) and a connection interface (2) disposed at an off-board charger, and a connection interface (3) and a connection interface (4) disposed on an electric vehicle. A monitoring point (4) and a resistor R8 are sequentially disposed between the connection interface (2) and a positive electrode of a pull-up power source U1 of the off-board charger. A resistor R7, a switch K8, and a monitoring point (3) are connected in series between the connection interface (1) and the positive electrode of the pull-up power source U1 of the off-board charger. The monitoring point (3) is not directly connected to the positive electrode of the pull-up power source U1. A monitoring point (5) and a resistor R9 are sequentially disposed between the connection interface (3) and a protective earthing conductor PE in the electric vehicle. A resistor R10, a switch K9 and a monitoring point (6) are connected in series between the connection interface (4) and the protective earthing conductor PE in the electric vehicle. The monitoring point (6) is not directly connected to the protective earthing conductor PE in the electric vehicle. During operation, the interface (3) is electrically connected to the interface (1), and the interface (4) is electrically connected to the interface (2). A system using the auxiliary circuit and a control method for the auxiliary circuit are also disclosed. The auxiliary circuit expands control, facilitates faster response, improves reliability and compatibility, and can determine the location of broken PE pins.

Description

technical field [0001] The invention relates to an electric vehicle DC charging control guiding auxiliary circuit, system and control method. Background technique [0002] The electric vehicle charging market is developing rapidly. At the end of 2015, the newly revised GB / T 18487.1 "General Requirements for Electric Vehicle Conductive Charging System Part 1" and other five charging technology national standards were officially released. China's DC charging scheme is one of the four major international charging schemes. Has been included in the IEC 61851-23 standard. With the vigorous popularization and promotion of standardization, the following technical blind spots in the standard are found in the process of large-scale construction of charging facilities: [0003] First, in the existing design, there is no hard node signal in the Chinese DC charging scheme. When an emergency occurs during charging, only data communication messages are used as a trigger, which has a slow ...

AI Technical Summary

Problems solved by technology

[0007] In view of the above problems, the present invention provides an electric vehicle DC charging control guidance auxiliary circuit, system and control method. By setting the auxiliary circuit in the off-board charger end and the electric vehicle end, the reliability and timeliness of DC high-power charging are improved; Further, realize rapid judgment and real-time response to fault detection, and solve the current problem of undetectable and forward-compatible PE broken needles

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