| 摘要 |
An exemplary DC to DC converter ( 2 ) includes a transistor ( 29 ), a first rectifying and filtering circuit ( 21 ), a pulse generating circuit ( 27 ) and a transformer ( 25 ). The first rectifying and filtering circuit transforms an external AC voltage to a first DC voltage. The transformer includes a primary winding ( 251 ), an assistant winding ( 252 ) connected with the primary winding in a flyback mode, and a secondary winding ( 253 ). The first DC voltage is connected to ground via the primary winding, the transistor in series. The pulse generating circuit includes a controlling terminal, a diode, a resistor, and a capacitor. One terminal of the assistant winding is connected to ground, and the other terminal of the assistant winding is connected to an anode of the diode. A cathode of the diode is connected to ground via the resistor and the capacitor in series. The controlling terminal is connected to gate electrode of the transistor.
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