Novel high-voltage interlocking connection state detection circuit

Abstract

The invention discloses a novel high-voltage interlocking connection state detection circuit, which is connected between an interlocking loop and a controller, is used for detecting the connection state of a high-voltage connector, and comprises a constant current source circuit, an input and output voltage detection circuit and an interlocking loop protection circuit, the first connecting end of the controller is electrically connected with the first connecting end of the interlocking loop through the constant current source circuit and the interlocking loop protection circuit in sequence. According to the novel high-voltage interlocking connection state detection circuit disclosed by the invention, the signal of the constant current source is introduced into the interlocking loop, the voltage between the output end and the input end of the interlocking loop is detected, and the impedance in the interlocking loop is determined by detecting the voltage difference between the two ends, so that the current interlocking state in the loop is judged.

Description

technical field [0001] The invention belongs to the technical field of high-voltage connector interlock state detection, and in particular relates to a novel high-voltage interlock connection state detection circuit. Background technique [0002] In recent years, the increasingly prominent environmental problems, rising oil prices and the promotion of national policies have promoted the rapid development of vehicle electrification, and more and more people choose electric vehicles as a means of travel. Since the batteries and motor drive units of electric vehicles are high-voltage electrical appliances, more and more attention has been paid to high-voltage safety issues. [0003] At present, the platform voltage of most pure electric and hybrid passenger vehicles on the market is greater than 300V, and some even reach as high as 800V. Therefore, both maintenance personnel and users are in danger of high-voltage electric shock. Therefore, under the principle of personnel sa...

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Problems solved by technology

[0006] 1. It can only detect on-off, but cannot detect whether the interlock connection is loose or not;

[0007] 2. Since the high-voltage circuit will be distributed in various parts of the vehicle, the circuit is long, and the output square wave will filter the square wave signal due to the existence of parasitic inductance and capacitance in the circuit, which will cause the signal to be input to the controller, and the signal will be generated. Deformation, causing the controller to fail to correctly identify the input signal, which in turn leads to misjudgment by the controller;

[0008] 3. The anti-interference ability is weak, and the interlock circuit is connected in series between multiple high-voltage and high-power controllers, so its electromagnetic environment is harsh, and because the square wave is a voltage-type signal, and the output capability is limited by the power consumption of the control circuit, it will not Very strong, so it is very vulnerable to interference and cause misjudgment by the controller

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