Direct current circuit protector

Abstract

The invention discloses a direct current circuit protector, comprising a work circuit, a single-chip microcomputer, a sampling circuit, a driving circuit, a switch tube, a testing circuit and an indicating circuit; the sampling circuit comprises a first sampling circuit and a second sampling circuit; the driving circuit comprises a first driving circuit and a second driving circuit; the switch tube comprises a first switch tube and a second switch tube; the work circuit is connected with the single-chip microcomputer and performs rectifying and voltage-stabilizing on the outwards-inputted current to supply to the single-chip microcomputer to be used as a work power supply; the first and second sampling circuits are all connected with the single-chip microcomputer and perform sampling on output current to provide for the single-chip microcomputer; the single-chip microcomputer is connected with the first and second driving circuits and controls the on / off of the first and second switch tubes by the first and second driving circuits, thus realizing the protection on the circuit of an electric driven bicycle; and the testing circuit and the indicating circuit are all connected with the single-chip microcomputer for testing and indicating the state of the direct current protector. The direct current circuit protector is accurate in the detecting on circuit current, capable of fast cutting off the current and sensitive in responding.

Description

technical field [0001] The invention relates to the technical field of control circuits, in particular to a DC circuit protector. 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 is relatively smal...

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, and it often happens that the electric vehicle has caught fire and the air switch has not cut off the circuit.

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