A fault detection circuit, method and device
A fault detection circuit and fault detection technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of not being able to pass the high-voltage assembly, unable to judge the high-voltage interlock circuit, etc.
Active Publication Date: 2017-07-28
GREAT WALL MOTOR CO LTD
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[0004] However, in the above implementation, since the high-voltage interlock circuits corresponding to each high-voltage assembly are connected in series, when the high-voltage interlock circuit corresponding to any high-voltage assembly is disconnected, the input / output ports of the microcontroller The current values are all zero, so it can be seen that the microcontroller cannot judge the high-voltage interlock circuit that has broken circuit through the current value of the input / output port. High voltage assembly with open circuit
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[0034] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0035] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0036] Such as figure 1 As shown, it is a fault detection circuit provided by an embodiment of the present invention, including: N branches.
[0037] Wherein, the N is an integer greater than or equal to 2.
[0038] The branch circuit includes: a switch unit K1 and a first resistance unit R1 connected in series. And the high voltage assembly includes at least one switch unit K1.
[0039]Wherein, the two ends of the first branch are respectively connected to the input / output port (I / O, Input / Out) and the ground terminal of the microcontroller M; The first resistance unit R1 is connected in parallel.
[0040] That is to say, the second branch is connected in parallel with the first re...
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The invention provides a fault detection circuit, method and device. The fault detection circuit comprises N branch circuits, and the N is an integer larger than or equal to two; each branch circuit comprises a switch unit and a first resistance unit, wherein the switch unit and the first resistance unit are connected in series; each high-voltage assembly at least comprises one switch unit, wherein the two ends of the first branch circuit are connected with an input port / output port and the grounded end of a microcontroller respectively, and the first resistance unit of the ith branch circuit and the first resistance unit of the (i+1)th branch circuit are connected in parallel; the i is an integer larger than or equal to two and smaller than or equal to N. The fault detection circuit is used for judging the high-voltage assembly where an open circuit occurs through the current values of the input port / output port of the microcontroller.
Description
technical field [0001] The invention relates to the technical field of electronic equipment, in particular to a fault detection circuit, method and device. Background technique [0002] At present, the high-voltage assemblies of electronic equipment (such as new energy vehicles) mainly include: high-voltage battery packs, motor controllers, motors, chargers, and high-voltage compressors, etc., and these high-voltage assemblies require a high voltage when working. If the user does not operate properly, it may lead to high-voltage accidents, so high-voltage safety is particularly important. In order to solve the high-voltage safety problem, a high-voltage interlock circuit is usually added to each high-voltage assembly, and the high-voltage interlock circuit is connected with the input / output port of the microcontroller. The so-called high-voltage interlock refers to a closed loop formed by the terminal interlock lead wire after the micro switch connected to the end cover is ...
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IPC IPC(8): G01R31/02
Inventor 颜广博尹彩锋尹显宝翁浩宇谢英杰
Owner GREAT WALL MOTOR CO LTD