| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vehicular power supply device with a simple circuit constitution capable of detecting a voltage and a current of a high-voltage battery with high accuracy. <P>SOLUTION: The vehicular power supply device includes: a high-voltage battery 1 connected in series with a plurality of rechargeable cells; a current detection part 3 for detecting a current flowing to the high-voltage battery 1; a voltage detection circuit 4 for detecting a voltage of the high-voltage battery 1; and a power supply circuit 5 for supplying power to the power supply lines 20 of the voltage detection circuit 4 and the current detection part 3. The current detection part 3 is provided with a shunt resistor 7 connected in series with the cells and a current detection circuit 6 for detecting the current from voltage at both ends of the shunt resistor 7. The power supply circuit 5 is an insulation-type power supply circuit 5A for supplying power-supply power insulated from the chassis earth of a vehicle. The insulation-type power supply circuit 5A supplies power to both power supply lines 20 of the current detection circuit 6 and the voltage detection circuit 4. <P>COPYRIGHT: (C)2010,JPO&INPIT |
