Circuit for detecting connection state of high-voltage connector

Abstract

The invention discloses a method for detecting the connection state of a high-voltage connector. The method comprises the following steps that 1, a pulse signal is generated; 2, the pulse signal is output to a signal detection line 1 of the high-voltage connector; 3, a signal detection line 2 of the high-voltage connector returns the signal to a chip; 4, the connection state of the high-voltage connector is judged according to the signal returned to the chip by the high-voltage connector. According to the method, the connection state of the high-voltage connector is detected through the pulsesignal, so that the situation is avoided that a wrong signal is generated after the signal lines and a machine shell are short-circuited and accordingly misjudgment of a CPU or the chip is caused; thedetection effect of the method is good.

Description

technical field [0001] The invention relates to a high-voltage connector connection state detection circuit. Background technique [0002] At present, most of the high-voltage electrical equipment on-board electric vehicles obtain electric energy through an integrated power cabinet. As the centralized power distribution equipment for many electrical equipment, the integrated power cabinet is connected to various electrical equipment on the vehicle through many high-voltage connectors. However, the operating environment of the car is harsh. During operation, the connector may become loose or fall off due to vibration or other reasons, which will have unpredictable consequences. Therefore, it is very necessary to detect the connection state of the connector. In addition to the terminals used to connect the circuit, the current high-voltage connectors also lead out two detection signal lines. When the connector is normally connected, the two signal lines are turned on. line ...

AI Technical Summary

Problems solved by technology

One of the current connector connection state detection schemes is that the CPU sends a level signal, and then receives a level signal after passing through the signal line of the connector, and judges the connection state of the connector through the level signal, but in the signal line When it is accidentally connected to the case and short-circuited to the ground, an erroneous signal will be returned to the CPU, resulting in misjudgment by the CPU; another solution is that the CPU generates a pulse waveform, and after passing through the signal line and other circuits, it returns a signal to the CPU, but this This solution will occupy CPU resources, and will cause a serious burden when there are too many connectors

[0003] There are two main disadvantages of the existing high-voltage connector open circuit detection circuit: one is through level signal detection, which will generate wrong fault information when the detection signal line is short-circuited to the casing; the other is to generate pulse waveforms through the CPU , this method can distinguish the situation where the signal line is short-circuited to the chassis, but this method will occupy a large amount of CPU I / O resources when multiple connectors are disconnected.

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