Philips color TV switching power supply circuit diagram

Power MOS field effect tube switching power supplies are the same as bipolar power tube switching power supplies. They are also divided into series and parallel types. This article takes the switching power supply of Philips color TV as an example to introduce the series switching power supply. The circuit is as shown in the figure. The circuit consists of an oscillation circuit, a pulse width adjustment circuit and a sampling comparison circuit. Among them, the field effect transistor VT610 and its peripheral components VD610, VD620, C613, C620, C610, L620, R613, R612, R611, R616, R680, etc. form a self-excited oscillator; VT614, VD618, VD617, VD614, I617, C616, C617 , C614, C615, R614, R615, R617, R618, R619, etc. form the pulse width adjustment circuit; VT628, VD629, R625, R626, R627, R628, R629 and other components form the sampling comparison circuit.

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