POWER SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a power supply system, capable of outputting voltage of predetermined polarity regardless of the polarity of external supply voltage. SOLUTION: The power supply system comprises an inverting voltage generating circuit 9 which inverts the output of a second DC-DC converter 7; a first oscillation circuit 3 which outputs pulse signals for controlling a first DC-DC converter 2; a second oscillation circuit 8 which outputs pulse signals for controlling the second DC-DC converter 7 and the inverting voltage generating circuit 9; and diode circuits 5 and 11 which receive the output of the first DC-DC converter and the output of the second DC-DC converter and output power to a second terminal. The first DC-DC converter and the second DC-DC converter are different from each other in the polarity of power to be subjected to voltage conversion. COPYRIGHT: (C)2004,JPO&NCIPI