Patent ID: 8917039
Filing Date: 2014-12-23
Classification: B60L,H02J,Y02T

Abstract:
1. A car power source apparatus comprising: a driving battery having a plurality of batteries connected in series to supply power to a vehicle driving motor; battery-switches that connect the driving battery to a vehicle-side load; a control circuit that controls the battery-switches; an auxiliary battery that supplies operating power to the control circuit power supply line, and a supplementary power supply circuit that supplies operating power to the control circuit power supply line from a segment of the batteries of the driving battery and that maintains control circuit operation if supply voltage drops in the auxiliary battery power supplied to the control circuit power supply line, wherein the supplementary power supply circuit supplies operating power to the control circuit power supply line at the control circuit operating voltage from one segment of the batteries of the driving battery, such that in an auxiliary battery voltage drop condition, control circuit operation is maintained to maintain control of the battery-switches, wherein the supplementary power supply circuit includes supplementary power switches that are switched ON in an auxiliary battery voltage drop condition, a voltage detection circuit that detects the voltage on the control circuit power supply line or the voltage of the auxiliary battery, and a decision circuit that judges a voltage drop condition when the voltage detected by the voltage detection circuit is below a first set voltage, and judges normal conditions when the detected voltage is above a second set voltage, wherein in the voltage drop condition, the decision circuit switches ON the supplementary power switches to supply operating power from one segment of the driving battery to the control circuit power supply line, and wherein under normal conditions, the decision circuit switches the supplementary power switches to the OFF state to supply operating power from the auxiliary battery to the control circuit power supply line.