| 摘要 |
PROBLEM TO BE SOLVED: To provide a nobel DC-DC converter circuit which corrects input voltage with a simple circuit without need for a secondary detection circuit and a transfer circuit of a photocoupler. SOLUTION: This DC-DC converter circuit includes a switching circuit having a main switching device 2 connected in series to the winding of a transformer 1 insulated between primary and secondary sides, and a driving circuit 3 fos stabilizing the secondary output voltage by PWM controlling the main switching device 2 to oscillate a PWM driving pulse. The output of the driving circuit 3 is connected to a control terminal of the main switching device 2, and a correction circuit 4 for outputting a voltage level inversely proportional to an input voltage. COPYRIGHT: (C)2004,JPO&NCIPI
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