Control method for switching power supply circuit

Details Control method for switching power supply circuit Control method for switching power supply circuit

2007-07-10

2007-07-10

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021050, C363S097000

Reexamination Certificate

active

11206118

ABSTRACT:
A control method for controlling a switching power supply circuit has a control circuit including a setting device that limits the exciting current of a transformer at the time of changeover from a switching delay to a switching period. The setting value set by the setting device is changed slowly to prevent the exciting current of transformer from changing rapidly and to reduce the excitation noise of transformer, and the setting value is changed gradually to prevent the output voltage from lowering even when the load becomes heavier than a certain value during the light load operation. The control method facilitates reducing the electric power consumption of the switching power supply circuit under a light load, reducing the transformer excitation noise and preventing the output voltage from lowering when the load is light.

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