| 摘要 |
PROBLEM TO BE SOLVED: To attain a switching power supply capable of fetching a plurality types of output voltages without dividing one winding. SOLUTION: A secondary winding 2 of a transformer 10 has taps (c), (d) without being divided. The tap (c) of the secondary winding 2 is connected with one end of an inductance L1 , an anode of a diode D1 is connected with the other end of the inductance L1 , and a cathode is connected with one end of a capacitor C2 and a resistor R2. The tap (c) of the secondary winding 2 of the transformer 10 is connected with the anode of a diode D2 , and the cathode is connected with one end of a capacitor C1 and a resistor R1. Namely, a PWM control circuit 5 feeds back and inputs output voltage Vo, and a transistor Tr is switched so that the voltage Vo may become constant. Thus, two types of outputs can be attained on the secondary side without the secondary winding 2 being divided.
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