To provide an insulation detector for a non-grounded circuit which is capable of accurately detecting insulation between the non-grounded circuit and a grounding potential section mounted onto a vehicle.
The detector comprises a first resistor 21 which is connected to positive-electrode wiring of a DC power supply 12 and has a resistance higher than the insulation criterion for maintaining insulation between the non-grounded circuit 10 and the grounding potential section BE of the vehicle; a second resistor 22 which is connected to negative-electrode wiring of the DC power supply 12 and has a resistance higher than the insulation criterion; a third resistor 23 which is connected between the first resistor 21 and the second resistor 22, grounding wiring which connects a connection of the second resistor 22 and the third resistor 23 to the grounding potential section BE of the vehicle; and an insulation level detecting means 31 which inputs an inter-terminal voltage Vin of the third resistor 23 via a differential amplifier 26 and detects the insulation level between the non-grounded circuit 10 and the grounding potential section BE of the vehicle, based on the voltage Vin.
| JPH07270467 | FAILURE STATE DISCRIMINATION METHOD |
| JP2012016174 | POWER SUPPLY DEVICE FOR VEHICLE |
INOUE HIDETAKA
SAKAI KOJI
SUGIYAMA SATORU
| JP2005189005A | 2005-07-14 | |||
| JPH08226950A | 1996-09-03 | |||
| JP2002296316A | 2002-10-09 |
Susumu Hori
Takeshi Sagi
Kenichi Homma
Tsuyoshi Kagaya
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