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Insulation deterioration detection apparatus
专利权人:
DENSO CORPORATION
发明人:
Hayato Mizoguchi,Tsuneo Maebara
申请号:
US13933852
公开号:
US09041406B2
申请日:
2013.07.02
申请国别(地区):
US
年份:
2015
代理人:
摘要:
An apparatus capable of detecting reduction in insulation resistance between a vehicle body and a high-voltage circuit. In the apparatus, a filter for removing noise included in a potential to ground at a terminal of a coupling capacitor includes a digital filter and an aliasing suppression circuit for suppressing aliasing in the digital filter. In addition, a protection circuit, which protects the digital filter and a determiner operable to detect the reduction in insulation resistance from high-voltage noise generated in the high-voltage circuit, is electrically disposed between a resistor of the aliasing suppression circuit and a signal input of the digital filter, where a potential at a junction between the resistor of the aliasing suppression circuit and the signal input of the digital filter is lower than a potential at the terminal of the coupling capacitor upon application of the high-voltage noise to the apparatus.
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