| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-output switching power supply apparatus for stabilizing a plurality of inexpensive output voltages without using a step-up chopper circuit. SOLUTION: The multi-output switching power supply apparatus includes a series circuit of a first switching element Q1 and a second switching element Q2, which are connected to output ends of a DC power supply 2, a control circuit 10a which alternately turns on/off the first switching element and the second switching element and converts DC voltage of the DC power supply into an AC voltage, a series circuit of a primary winding P1 of a reactor Lr and a transformer T1 and a current resonance capacitor Cri, which is connected to both ends of the first switching element or the second switching element, first rectifying/smoothing circuits D1 and C1 rectifying/smoothing a voltage generated in a first secondary winding S1 of the transformer and for output of a first output voltage Vo1, and second rectifying/smoothing circuits D2 and C2 rectifying/smoothing voltage generated in a second secondary winding S2 of the transformer and for output of second output voltage Vo2. The control circuit controls an on-period of the first switching element based on first output voltage and controls an on-period of the second switching element based on second output voltage. COPYRIGHT: (C)2011,JPO&INPIT |
