| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multiple-output switching power supply device which can feed stable power supply voltages following load variations to a plurality of loads without causing the breakage of a circuit. Ž<P>SOLUTION: The multiple-output power supply device comprises: a primary-side switching element which makes a current based on an input power supply voltage flow to a primary winding of a transformer; first to n-th DC conversion circuits which lead out DC-converted both-end voltages of first to n-th secondary windings of the transformer to first to n-th output power supply lines as first to n-th power supply voltages; and a control means. Each of the first to n-th DC conversion circuits includes a secondary switching element which leads out a voltage of a secondary winding of the transformer rectified by a diode in an on-state to the output power supply line, and on the other hand, sets the output power supply line to a floating state in an off-state. The control means sets only the secondary switching element in one DC conversion circuit among the first to n-th DC conversion circuits to an on-state while the primary switching element is in the off-state. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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