Leakage detection apparatus and motor car

Details Leakage detection apparatus and motor car Leakage detection apparatus and motor car

2005-07-19

2005-07-19

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S511000, C361S042000

Reexamination Certificate

active

06919726

ABSTRACT:
A leakage detection apparatus is provided, capable of performing high-speed leakage detection during startup of a motor-vehicle such as an HEV. The apparatus includes a signal generator31for generating a signal whose frequency is set variably, a resistor33for attenuating the signal in cooperation with an insulation resistor between a high-voltage circuit10and a low-voltage circuit20, a coupling capacitor34for capacitance-coupling one end of a resistant element to the high-voltage circuit, an LPF35whose cut-off frequency is set variably, for attenuating a high frequency component via the capacitive element to be superimposed on the signal via the resistant element, a leakage detection portion381for comparing an amplitude level of the signal via the LPF with a predetermined threshold value so as to detect the presence or absence of leakage between the high-voltage circuit and the low-voltage circuit, and a control portion382for setting the signal frequency of the signal generator and the cut-off frequency of the LPF after startup of the low voltage circuit and before startup of the high-voltage circuit to be higher than those after startup of the high-voltage circuit.

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