| 摘要 |
A transformer has a primary winding connected across a dc power supply via a first switch such as a field effect transistor, and a secondary winding connected to a smoothing capacitor via a rectifying diode. Another field effect transistor or like second switch is connected in parallel with the rectifying diode. The voltage of the rectifying diode, detected by a serial circuit of a resistor and a reverse blocking diode, is compared with a reference voltage, and the second switch is made conductive when the diode voltage is less than the reference voltage.
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