| 摘要 |
A constant current output control method and device for a switching power supply circuit for constant current output control of an output current I2o of a rectifying smoothing. An OFF adjustment time T3 is: T3=T2x(Np/NsxIpref/2/I2oset-1)-T1 (1) in which, I2oset represents a set output current of the rectifying smoothing circuit, Np represents a number of turns of a primary winding, Ns represents a number of turns of a secondary winding, T1 being a fixed time representing an ON time, Ipref representing a reference peak current flowing in the primary winding, and T2 representing an output time during which output is generated from the rectifying smoothing circuit. Output current I2o during an oscillation period T becomes set output current I2oset, and constant current output control can be executed by repeating this method.
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