Insulation monitoring device and method for new energy vehicle alternating current wiring harness

Abstract

The invention discloses an insulation monitoring device and method for a new energy vehicle alternating current wiring harness. The device comprises an isolating power module, a first linear optocoupler, a second linear optocoupler, a first signal conditioning module, a second signal conditioning module, an AD conversion module and a DSP module. A positive pole of a light emitting diode of the first linear optocoupler is electrically connected with DC1 of the isolating power module. A collector of a phototriode of the first linear optocoupler is electrically connected with DC2 of the isolatingpower module. An emitter of the phototriode of the first linear optocoupler is electrically connected with the AD conversion module through utilization of the first signal conditioning module. The emitter of the phototriode of the first linear optocoupler is also grounded through utilization of a resistor R1. The AD conversion module is connected with the DSP module. The DSP module is electrically connected with the DC2 of the isolating power module. According to the device and the method, an insulation resistance value of the alternating current wiring harness for a vehicle body can be knownin real time, and a fault point can be positioned rapidly.

Description

technical field [0001] The invention belongs to the technical field of insulation monitoring and protection of two-way on-board chargers for electric vehicles, and in particular relates to an insulation monitoring device and method for AC wiring harnesses of new energy vehicles. Background technique [0002] At present, more and more new energy vehicles use two-way on-board chargers. The two-way on-board charger can not only supplement electric energy for the battery pack, but also convert the electric energy of the battery pack into an AC power supply to provide electric energy for AC appliances such as household appliances. However, during the daily use of new energy vehicles, harsh environments such as humidity, vibration, and exposure to the sun can easily cause aging and cracking of the wiring harness, thereby reducing the insulation safety of the vehicle. When the insulation strength of the AC wiring harness of the two-way on-board charger decreases, it will directly e...

AI Technical Summary

Problems solved by technology

[0003] At present, some models on the market have an insulation monitoring function, but this monitoring function belongs to the threshold judgment type, that is, when it is detected that the insulation strength of any phase cable of the AC wiring harness to the body drops to a certain value, the external AC power output will be stopped. , this method cannot know the specific value of cable insulation resistance, and cannot quickly locate the fault point

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