Circuit protector for electric vehicle

Abstract

The invention discloses a circuit protector for an electric vehicle. The circuit protector for the electric vehicle comprises a working circuit, a single chip microcomputer, a sampling circuit, a driving circuit, a switching pipe, a testing circuit and an indicating circuit, wherein the sampling circuit comprises a first sampling circuit body and a second sampling circuit body, the driving circuit comprises a first driving circuit body and a second driving circuit body, and the switching pipe comprises a first switching pipe body and a second switching pipe body . The working circuit is connected with the single chip microcomputer, rectifies and conducts voltage stabilization on an external input current, and provides the current for the single chip microcomputer as a working power supply. Both the first sampling circuit body and the second sampling circuit body are connected with the single chip microcomputer, sample an output current and provide the current for the single chip microcomputer. The single chip microcomputer is connected with the first driving circuit body and the second driving circuit body, controls the switching on and the switching off of the first switching pipe body through the first driving circuit body and controls the switching on and the switching off of the second switching pipe body through the second driving circuit body, and therefore protection of an electric vehicle circuit is achieved. Both the testing circuit and the indicating circuit are connected with the single chip microcomputer and used for testing and indicating states of the circuit protector for the electric vehicle. The circuit protector for the electric vehicle is accurate in current detection for the circuit, can rapidly cut off the current and is sensitive in reaction.

Description

technical field [0001] The invention relates to the technical field of control circuits, in particular to a circuit protector for electric vehicles. Background technique [0002] The circuit diagram of the current circuit protection scheme adopted by electric vehicles (including electric bicycles, electric tricycles, and electric motorcycles) is as follows: figure 1 As shown, it mainly includes terminal blocks (A1, A2, B1, B2, B21, B22, B12), air switch K1, power lock K2 and fuse F1. Many electric vehicles even omit fuse F1. Among them, A1 and A2 are respectively connected to the negative pole and positive pole of the battery pack, and B1 and B2 are respectively connected to the negative pole and positive pole of the controller. This group of wires is relatively thick because it supplies power to the load (motor), and B21 is connected to the controller. The positive pole on the side is connected to supply power to the control circuit of the controller, and the wire diameter...

AI Technical Summary

Problems solved by technology

[0004]1. The power lock cannot completely cut off the power supply of the circuit, and the electric vehicle may malfunction;

[0005]2. The response of the air switch is slow. It often happens that the electric vehicle has caught fire and the air switch has not cut off the circuit

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