| 摘要 |
PROBLEM TO BE SOLVED: To obtain a push-pull switching power supply wherein output voltage is kept constant, even if input voltage or the load fluctuates. SOLUTION: Output, obtained by rectifying and smoothing the current of a primary winding or a detection winding, is fed back to an element which controls the output of main switching elements. Thereby, the output of the switching elements is controlled. If the input voltage is increased, operation is performed so as to reduce the output of the switching elements. If the input voltage is reduced, operation is performed so as to increase the output of the switching elements. A transistor is used as a control element, and the operation of the control element is controlled by the feedback signal. COPYRIGHT: (C)2004,JPO
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