Structure of high-voltage electric control circuit for electric automobile

Abstract

The invention relates to a structure of a high-voltage electric control circuit for an electric automobile. The structure comprises a battery, a pre-charging circuit, a main relay, a soft turn-off circuit and a full turn-off circuit, wherein the main relay is a 12V common industrial relay; one end of the main relay is connected with the battery; the other end of the main relay is connected with a motor controller through the full turn-off circuit; the pre-charging circuit and the soft turn-off circuit are both in parallel connection with the main relay and are serially connected between the battery and the full turn-off circuit; and a control coil of the main relay and a power relay control coil of the full turn-off circuit are both connected with the soft turn-off circuit. With such structure, the structure of the high-voltage electric control circuit for the electric automobile respectively finishes the processes of charging and supplying power to a load motor controller and cutting off a high-voltage direct current power supply by a power supply battery through a pre-charging process, a normal working process and a cut-off process. An especially expensive direct current relay is replaced by the common industrial relay, thereby being low in cost, avoiding arc generation, and meanwhile, achieving a soft turn-on / off circuit and limiting an instant peak current.

Description

technical field [0001] The invention relates to the field of circuit structures, in particular to the field of high-voltage control circuit structures, and specifically refers to a high-voltage control circuit structure for electric vehicles. Background technique [0002] The high-voltage electrical control box is an essential component of an electric vehicle. Generally, the high-voltage electrical control box is mainly composed of a DC relay (main relay), a pre-charging relay, a solid-state relay (DCDC), a solid-state relay (PTC), a pre-charging resistor, a fuse and a current It is composed of components such as sensors to realize the ability to safely break the high-voltage power supply. Among them, although the DC relay, that is, the main relay, can realize the arc-free function very conveniently, it is very expensive, which leads to the high cost of the high-voltage electric control box. It also indirectly leads to higher production costs of electric vehicles, and also ...

AI Technical Summary

Problems solved by technology

Among them, the DC relay, that is, the main relay, although it is very convenient to realize the function of no arc, it is very expensive, which leads to the high cost of the high-voltage electric control box

It also indirectly leads to higher production costs of electric vehicles, and also makes electric vehicles lack price advantages compared with traditional fuel-powered vehicles, which seriously hinders the popularization of electric vehicles and the further development of electric vehicle technology

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