Interlocking detecting circuit, system and method of high-voltage parts

Abstract

The invention provides an interlocking detecting circuit, system and method of high-voltage parts and belongs to the technical field of electric cars. Interlocking detecting circuits are arranged in the high-voltage parts. Each detecting circuit comprises a high-voltage part control module. The output ends of the high-voltage part control modules are connected with first low-voltage pins of high-voltage inserts of the high-voltage parts in a coupling mode. The input ends of the high-voltage part control modules are connected with second low-voltage pins of the high-voltage inserts of the high-voltage parts in a coupling mode. Accordingly, the interlocking detecting circuits are formed between the high-voltage part control modules and the high-voltage inserts. The high-voltage part control modules continuously output interlocking detecting signals which are transmitted in the interlocking detecting circuits. When transmission of the interlocking detecting signals in the interlocking detecting circuits is in failure, the high-voltage part control modules control the high-voltage parts to stop working, and meanwhile corresponding interlocking control signals are transmitted to a whole car high-voltage interlocking detection unit. After the whole car high-voltage interlocking detection unit receives the interlocking control signals, output of a high-voltage power supply is cut off.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and relates to interlock detection control of high-voltage components of electric vehicles, in particular to an interlock detection circuit of high-voltage components of electric vehicles, an interlock detection system and a detection method using the interlock detection circuit. Background technique [0002] For safety reasons, electric vehicles are required to be equipped with an interlock detection system to detect whether the high-voltage connectors of all high-voltage components are well connected. When detecting that the high-voltage connector of any high-voltage component is disconnected from the power supply (that is, not connected in good condition), the interlock detection system should be able to detect the disconnection information in time and cut off the high-voltage battery in time. [0003] The existing interlock detection system is generally set up like this: each corres...

AI Technical Summary

Problems solved by technology

[0004] However, in the loop of the existing interlock detection system, it is necessary to connect the feedback signals at the high-voltage connectors of all high-voltage components of the vehicle in series with hard wires to form a loop. Since the high-voltage components in the vehicle are distributed throughout the vehicle body , In this way, the length of the hard line forming the loop in series is very long, and the wiring is complicated, which greatly increases the cost of the low-voltage wiring harness of the interlock detection system

Moreover, the low-voltage connectors of all high-voltage components need to add at least two PIN pins for output, and the increase in the number of PIN pins will increase the cost of low-voltage connectors

Further, when using the interlock detection system, at the moment when the high-voltage connector is disconnected from the power supply, the high-voltage components will not automatically stop working before cutting off the high-voltage output of the battery, so the instantaneous cut-off of the high-voltage output will also affect the high-voltage components Causes impact, high-voltage components are easily damaged

Images