PROBLEM TO BE SOLVED: To provide a ground fault detection circuit for a vehicle having a high voltage power source system that is able to appropriately achieve detection frequency and detection accuracy of ground fault of a high voltage power source system.SOLUTION: A ground fault detection circuit 10 that detects ground fault of a high voltage power source system electrically insulated from a vehicle body comprises: a coupling capacitor Cs connected to the high voltage power source system and configured to insulate a DC component; a resistance element Rs connected to the coupling capacitor Cs in series; an oscillation circuit 12 connected to the resistance element Rs in series and configured to apply AC voltage of predetermined frequency to the resistance element Rs; detecting means 11, 13 that detect ground fault of the high voltage power source system on the basis of voltage at a connection point P between the coupling capacitor Cs and the resistance element Rs; and varying means 11 that changes the predetermined frequency fc of AC voltage output from the oscillation circuit 20 according to the state of connection between a battery 20 included in the high voltage power source system and other electric apparatus included in the high voltage power source system.SELECTED DRAWING: Figure 1
【課題】高電圧電源系の地絡の検出頻度と検出精度とを適切に両立することが可能な高電圧電源系を備えた車両の地絡検出回路を提供する。【解決手段】車体と電気的に絶縁された高電圧電源系の地絡を検出する地絡検出回路10であって、高電圧電源系に接続されて直流成分を絶縁するカップリングコンデンサCsと、カップリングコンデンサCsに直列接続された抵抗素子Rsと、抵抗素子Rsに直列接続され、抵抗素子Rsに所定周波数の交流電圧を印加する発振回路12と、カップリングコンデンサCsと抵抗素子Rsとの接続点Pでの電圧に基づいて、高電圧電源系の地絡を検出する検出手段11,13と、高電圧電源系に含まれるバッテリ20と高電圧電源系に含まれるその他の電気機器との接続状態に応じて、発振回路20により出力される交流電圧の所定周波数fcを変化させる可変手段11と、を備える。【選択図】 図1
GROUND FAULT DETECTION CIRCUIT FOR VEHICLE HAVING HIGH VOLTAGE POWER SOURCE SYSTEM
高電圧電源系を備えた車両の地絡検出回路
2016-05-30
Patent
Electronic Resource
Japanese
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