Rabin & Berdo, P.C.
Switching power supply
A switching power supply includes a current resonance-type DC-DC converter that has an auxiliary winding provided on the primary side of a transformer, divides a voltage, which has been generated in the auxiliary winding by a current resonance operation, using a voltage divider circuit formed of resistors, and supplies, to a control IC, the divided voltage as a detection voltage for the resonant voltage for setting a timing for turning off a switching element. A phase correcting capacitor is provided between the auxiliary winding and the voltage divider circuit and corrects a delay in switching timing by setting the phase of the voltage of the voltage divider circuit ahead of the voltage of the auxiliary winding.
FUJI ELECTRIC CO., LTD.
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Chen