Switching mode power supply and method of operation

Details Switching mode power supply and method of operation Switching mode power supply and method of operation

2011-08-16

2011-08-16

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S097000

Reexamination Certificate

active

08000119

ABSTRACT:
In one embodiment, an SMPS includes a rectifier for generating an input DC voltage from an input AC voltage. A switching transistor is coupled to a primary coil of a transformer for generating power which is transferred to a second side of the transformer according to an operation of the switching transistor. A switching controller receives a feedback voltage corresponding to an output voltage, a sensing signal corresponding to a current flowing through the switching transistor, and a first signal corresponding to a voltage difference between a first electrode and a second electrode of the switching transistor. The switching controller controls an on/off operation of the switching transistor. The switching controller sets a threshold period whenever the first signal has a value greater than a reference value, thereby setting a plurality of threshold periods during operation of the switching mode power supply. For each threshold period, the switching controller turns on the switching transistor at a point after a variable delay time from a previous point at which the switching transistor was turned on.

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