| 摘要 |
PURPOSE:To simplify the winding of a main transformer by obtaining voltages for driving and controlling a drive circuit of a main transistor from an auxiliary winding of the transformer. CONSTITUTION:A DC power source voltage E is controlled ON or OFF by a main transistor, applied to the primary winding N1 of a transformer T, and a voltage induced in the secondary winding N2 is supplied to a load R through a rectifying and smoothing circuit having a diode D1 and a capacitor C2. When the transistor is conducted, the voltage induced in the tertiary winding N3 is supplied as a power source V'E of a drive circuit CONT of the transistor through the diode D1, a capacitor C3 and a diode D4, and when the transistor is interrupted, the control voltage VS of the drive circuit CONT of the transistor is supplied through a diode D2, a capacitor C4 and the diode D3. |
