Merchant & Gould P.C.
Switching power supply
 A switching power supply of a step-down chopper system, which is capable of reducing power consumption and unused power supply to the output. A voltage supplied to an input main terminal is turned ON/OFF by a switching device controlled by a control circuit, and outputted to an output main terminal through a conversion circuit. An output voltage detecting circuit detects the output voltage at the output main terminal, and according to the state of the output voltage detected, a feedback circuit is controlled, so that the ON/OFF control over the switching device by the control circuit is paused (or stopped). Thus, the switching device oscillates or is paused (stopped) according to the output voltage. 
Matsushita Electric Industrial Co., Ltd.
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Yuji Tetsuji Yoshiaki Yoshihiro
Yamanishi Yamashita Hachiya Mori