High-voltage interlock detection circuit and automobile

Abstract

Provided are a high-voltage interlock detection circuit and an automobile. The high-voltage interlock detection circuit includes a voltage dividing module coupled with a high-voltage interlock loop toform a detection loop, and a first signal generator to generate a positive voltage square wave current signal. A second signal generator for generating a negative voltage square wave current signal;A detection unit that detects a first signal component of a first frequency on the voltage dividing module and outputs a first detection level and a second detection level, and a second signal component of a second frequency on the voltage dividing module and outputs a third detection level and a fourth detection level; A control unit determines whether the high voltage interlock loop is abnormalbased on the detection level. The HVIL loop is driven by a square wave current signal. Because the loop is a single closed loop and there is no branch loop, the current signal will not change with thelength of the transmission line and there is no signal attenuation. Therefore, the HVIL loop has a longer transmission distance and can meet the general platform requirements of almost all types of vehicles for the length of the high voltage interlocking loop.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a high-voltage interlock detection circuit and a vehicle. Background technique [0002] At present, with the rapid development and popularization of new energy vehicles in China, the safety of new energy vehicles has attracted more and more attention. Since the voltage of the high-voltage system of new energy vehicles is generally between 300V and 600V, and this voltage range is far beyond the safe voltage range of the human body, based on the consideration of protecting the personal safety of drivers, passengers and maintenance personnel, the High Voltage Interlock Loop (High Voltage Interlock Loop) , HVIL) technology is widely used in the field of high-voltage safety of new energy vehicles. The high-voltage interlock device uses low-voltage electrical signals to connect the various components of the high-voltage system (including power battery systems, ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a high-voltage interlock detection circuit and a car, aiming at solving the problem of using voltage signals for loop interlock detection in the traditional technical solution. When the interlock loop of the whole vehicle is too long, the loop line The resistance increases, which leads to a large additional voltage drop in the loop, which brings numerical deviations to the interlock detection, affects the detection reliability, and the anti-interference ability of the voltage signal is poor.

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