Switching mode power supply

Details Switching mode power supply Switching mode power supply

1998-12-15

2000-11-21

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 20, 363 16, H02M 3335

Patent

active

061512257

ABSTRACT:
A switching mode power supply including a transformer, a power transistor, rectifiers, filters, a feedback portion, a power transistor controlling portion, and a synchronous signal controlling portion is provided. The transformer includes an input winding to one end of which an input voltage is applied and a feedback winding, one end of which is grounded, and to which energy is fed back from a secondary winding, in a primary winding, and at least one secondary winding. The power transistor has a first electrode and a second electrode connected between the other end of the input winding and a ground. The rectifiers rectify the voltage generated by the secondary windings to direct current. The filters filter the direct current voltage output from the rectifiers and output it as an output voltage. The feedback portion feeds back some of the output voltage to the power transistor controlling portion. The power transistor controlling portion, the output port of which is connected to the controlling electrode of the power transistor, controls the power transistor in response to a signal output from the feedback portion and a synchronous signal applied from the outside. The synchronous signal controlling portion connected between the other end of the feedback winding and the power transistor controlling portion, to which the synchronous signal is applied, turns on the power transistor right before or right after the power transistor is turned on after the power transistor is turned off, in an initial stage in which the synchronous signal begins to be applied in response to the voltage generated in the feedback winding.

REFERENCES:
patent: 5734564 (1998-03-01), Brkovic

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