High voltage interlock detection circuit

Abstract

The invention provides a high voltage interlock detection circuit, comprising a high voltage interlock loop circuit with a loop input end and a loop output end; and a high voltage interlock circuit with a PWM signal input end and a signal back-check input end. The PWM signal output end is in communication with the loop input through a first current limitation resistor; the loop output end is in communication with the signal back-check input end through a second current limitation resistor; the high voltage interlock circuit comprises a monitoring chip and a filtering capacitor. The monitoring chip and the filtering capacitor are in communication with the signal back-check input end. The PWM signal outputted from the PWM signal output end returns to the signal back-check input end through the high voltage interlock loop circuit and enters the monitoring chip after filtering by the filtering capacitor. According to the technical schemes of the invention, single path PWM output and a monitoring chip are adopted so as to simplify a high voltage interlock detection circuit. The MCU only detects the electric level signal outputted from a watchdog and therefore, the operational resources occupied by the MCU are reduced; and in addition, the output of MCU detection can be realized only through the use of the digital input port, therefore, reducing the requirement on the MCU hardware port resources.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of circuit protection, in particular to a high-voltage interlock detection circuit. [0003] 【Background technique】 [0004] The integrity of the high-voltage power supply circuit is the basis for the operation of the high-voltage circuit. If the high-voltage circuit is incomplete, such as the connector is not connected, the circuit will not work normally, and even parts will be damaged in severe cases. [0005] In the related art, a high-voltage interlock circuit is generally used to detect the integrity of the high-voltage circuit, and the high-voltage interlock circuit generally adopts an analog type and a digital type. The analog type refers to the type in which the potential of the circuit is stable when the circuit is working after the high-voltage connection relationship is determined, for example, a simple resistor divider type, an optocoupler conduction type, etc., but its anti-interference ...

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention provides a high-voltage interlock detection circuit, which aims to solve the technical problem of how to reduce the complexity of the high-voltage interlock detection circuit, and can simplify the high-voltage interlock detection circuit, thereby reducing the test cost

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