POWER CONVERSION/SUPPLY METHOD, POWER CONVERSION/ SUPPLY APPARATUS AND VEHICLE

摘要

PROBLEM TO BE SOLVED: To supply a required DC voltage without providing two types of batteries. SOLUTION: A battery 1, connected to an alternator 3, has a 36 V output terminal and an intermediate terminal 1c for an output voltage of 12 V. A high-voltage system auxiliary apparatus 4 is connected to terminals of 36 V to 0 V, and the input side of a polarity reverse type DC-DC converter 5 is connected to the terminals of 36 V to 12 V. The output side of the DC-DC converter 5 and a low-voltage system auxiliary apparatus 6 are connected to the 12 V-0 V terminals of the battery 1. A control circuit 7 controls the ONs/ OFFs of a transistor TR1 with a high frequency according to the detection signal of a 1st voltage detection unit 8, which detects an output voltage supplied to the high voltage system auxiliary apparatus 4 and the detection signal of a 2nd voltage detection unit 9, which detects an output voltage V0 supplied to the low-voltage system auxiliary apparatus 6, so as to make the ratio of both the detection signals 3:1.