| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply device which is reduced in size with a simple constitution by using a coil with an intermediate tap and which efficiently converts a DC input voltage into a plurality of DC output voltages. SOLUTION: The switching power supply device stores and discharges an energy in and to the coil with the intermediate tap by switching on, off the DC input voltage from a DC power source and controlling the voltage. The power supply device rectifies/smoothes the controlled voltage generated at a plurality of terminals, and stably outputs a plurality of the DC output voltages. The device controls a connection to a reference potential at the voltage generated at the plurality of the terminals without depending upon the DC input voltage at on or off switching time. Further, the device improves characteristics in output voltage to input voltage (line regulation) for the plurality of the output voltages and can substantially eliminate an input voltage dependence. COPYRIGHT: (C)2004,JPO
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