| 摘要 |
PROBLEM TO BE SOLVED: To run a vehicle even when failure of one power supply occurs by providing a rectifier element for passing current from only the low voltage side towards the high voltage side between respective power input joints. SOLUTION: A high voltage power supply 1 is provided with a 36 V alternator and a battery, while a 12 V system power supply 3 is provided with a high efficiency DC/DC converter for converting the voltage of the high voltage power supply and a battery. A first diode 15a is connected in the direction for feeding a current from the 12 V system power supply to the 36 V system power supply in a controller 5, and a second diode 17a is connected in the direction to feed a current from the high voltage power supply 1 to a motor drive section. When part A is disconnected, the 12 V system power supply 3 begins to supply the motor drive section 9 via the first diode 15a at the instant when the supply voltage drops from 36 V to 12 V or below. Consequently, performance causing no troubles in normal operation can be ensured, and travele incapable situation can be prevented. |
