MULTIPLE-OUTPUT SWITCHING ELECTRIC POWER SOURCE DEVICE

摘要

A multiple-output switching electric power source device is provided with transformers (T1a) and (T2a) having at least a primary winding, and first and second secondary windings; a control circuit (12-1) that adjusts time during which a direct current voltage is applied to the primary winding (P1) of the transformer (T1a); a first rectifying and smoothing circuit that rectifies and smoothes a voltage induced at the first secondary winding (S1) of the transformer (T1a) to produce a first output voltage; a control circuit (12-2) that adjusts time during which a direct current voltage is applied to the primary winding (P2) of the transformer (T2a); a second rectifying and smoothing circuit that rectifies and smoothes a voltage induced at the first secondary winding (S2) of the transformer (T2a) to produce a second output voltage; and a third rectifying and smoothing circuit that rectifies and smoothes a voltage between both terminals of a series connected winding of the second secondary winding (S31) of the transformer (T1a) and the second secondary winding (S32) of the transformer (T2a)to produce a third output voltage.