| 摘要 |
PURPOSE:To obtain a portable equipment incorporating a constant voltage power source having good load characteristic and high conversion efficiency, by providing a first constant voltage power source for generating a single output voltage and a second constant voltage power source for generating a plurality of output voltages. CONSTITUTION:A source battery 101 feeds power to a first constant voltage power source 103 through a switch 102 and further feeds power to a second constant voltage power source 105 through a delay circuit 104. The first constant voltage power source is connected with a key input device 106, CPU107, a storage circuit 108 and a floppy disc 109 where variation of load of the floppy disc device 109 is especially high. The second constant voltage power source 105 is connected with an output device (liquid crystal display) 110. Since load characteristic and starting characteristic are improved, connection of a floppy disc drive and the like having considerable load variation causes no flickering on the output device (liquid crystal display). |
