| 摘要 |
The present invention provides a constant voltage output control method and a constant voltage output control device for a switching power supply circuit that allow accurate execution of a constant voltage control of an output voltage, even if there is variation in a utilized circuit element or an integrated circuit. A set voltage V2aset is obtained based on equation (1), V2ASET=NP/NSxV2BSET (1) where, V2bset represents an output voltage of a secondary output winding that is subject to the constant voltage control, Np represents a number of turns of a primary winding, and Ns represents a number of turns of the secondary output winding; and the set voltage V2aset is compared with a flyback voltage V2a of the primary winding.
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