Battery leakage detection circuit for electric vehicle and...

Electricity: battery or capacitor charging or discharging – One cell or battery charges another – Vehicle battery charging

Reexamination Certificate

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Reexamination Certificate

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07026788

ABSTRACT:
The present provides a leakage detection circuit for an electric vehicle, and so on, capable of calculating a leakage resistance. The leakage detection circuit for an electric vehicle detects a current Ig11(t1) that flows in leakage resistances Raand Rbwhen one leakage detection switch SW1is closed at t1and the other leakage detection switch SW2is opened, and detects a current Ig12(t2) when the switch SW1is opened at t2and the switch SW2is closed. In addition, the circuit detects voltages Vl11(t1, t2) and Vl12(t1, t2) of portions where these leakage detection resistances Raare connected. A combined value Rlof the leakage resistances is calculated by a leakage calculator based on the following equation 34Rl=RaVl12⁡(t2)Vg11⁡(t2)-Vg12⁡(t2)-Vl11⁡(t1)Vg11⁡(t1)-Vg12⁡(t1)-(Ra+Rb).Equation⁢⁢34

REFERENCES:
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patent: 5481194 (1996-01-01), Schantz et al.
patent: 6731116 (2004-05-01), Yamamoto et al.
patent: 2809596 (1979-09-01), None
patent: 2003-169401 (2003-06-01), None

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