| 摘要 |
PURPOSE:To reduce transmitting and radiating noise to the exterior by applying conducting noise adsorbing function having small inserting loss, thereby preventing the voltage breakdown of a switch element. CONSTITUTION:A flyback DC/DC converter has a transformer T2 including the first and second primary windings, a transistor Q2 operating as a switching element, and a rectifier 2 including a capacitor C3, a resistor R2, diodes D2, D5, a diode D4 and a capacitor C4. Induced noise generated at switching time is almost absorbed by a series/parallel circuit connected between the connecting point of the second primary winding T2(B) and the anode of the diode D2 and the collector of the transistor Q2 with the capacitor C3 having the prescribed capacity, the resistor R2 and the diode D5. |
