MAGNETIC CONTROL TYPE SWITCHING REGULATOR

摘要

PURPOSE:To increase the control range by reducing the rate of change of time of a voltage induced between the secondary winding terminals of a transformer when a switching element is turned ON and OFF. CONSTITUTION:A capacitor 10 as a voltage suppressor 1 is connected with the secondary side of a main transformer TM. Even if a switching element connected with the primary side of the transformer TM is turned OFF and a voltage is induced at the secondary side of the transformer TM, the voltage charges the capacitor 10. Accordingly, the rate of change of time of the induced voltage decreases. Consequently, the rate of decrease of the current flowed to a diode D1 immediately before the switching element becomes OFF decreases, thereby suppressing the reverse recovery current.