| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that a feedback signal is not transmitted to feedback input of an integrated circuit for power supply control when power supply is started and that starting is stopped when an integrated circuit for output voltage detection, in which feedback voltage logic is inverted, is used. <P>SOLUTION: The starting circuit for switching power supply comprises: means for setting a feedback signal of the integrated circuit for power supply control to fixed voltage and avoiding starting stop while power is supplied until DC power supply voltage supplied to the integrated circuit for power supply control from a tertiary winding of a converter transformer reaches voltage which is set until the integrated circuit for output voltage detection detects output voltage just after starting of a switching power supply and feeds the detected output voltage back to the integrated circuit for power supply control. <P>COPYRIGHT: (C)2012,JPO&INPIT |
