| 摘要 |
PURPOSE:To reduce the power loss due to damping resistor of an inductor connected with the base of a switching transistor by connecting the damping resistor of the inductor with a diode. CONSTITUTION:A capacitor C4 is connected between the emitter and the base of a switching transistor Tr1, and a series circuit of a damping resistor R4 and a diode D4 is connected in parallel with an inductor L. The transistor Tr1 forms a blocking oscillator with a time constant circuit of a resistor R1, a drive capacitor C3, and a feedback circuit of the primary winding N1 of an inverter transformer T and a drive winding N2. The transistor Tr1 is quickly turned ON by a resonance circuit of the inductor L and the capacitor C3 at the turning ON time, and the erroneous operation for turning ON at the turning OFF time is prevented by the resistor R4. A reverse current flowed to the resistor R4 is prevented by the diode D. |
