Patent ID: 11867768
Assignee: DENSO TEN LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. The battery voltage measurement circuit according to claim 8, wherein
the controller has at least two measurement processes of
(i) a first measurement process in which (1) the first switch is turned on and the second switch is turned off to form the first series-connected circuit consisting of the battery, one of the detection resistances, and the insulation member on the negative electrode side of the battery that comes into electrical contact with the negative electrode of the battery, and (2) the insulation resistance of the insulation member on the negative electrode side is calculated based on the first voltage measured by the measurement circuit,
(ii) a second measurement process in which (1) the first switch is turned off and the second switch is turned on to form the second series-connected circuit consisting of the battery, one of the detection resistances, and the insulation member on the positive electrode side of the battery that comes into electrical contact with the positive electrode of the battery, and (2) the insulation resistance of the insulation member on the positive electrode side is calculated based on the second voltage measured by the measurement circuit, and
(iii) a third measurement process in which (1) the first switch and the second switch are turned off, and (2) the offset voltage is calculated based on the third voltage measured by the measurement circuit.