Switched-mode power supply having a sample-and-hold circuit with

Details Switched-mode power supply having a sample-and-hold circuit with Switched-mode power supply having a sample-and-hold circuit with

1998-06-29

1999-09-21

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 78, 363 97, 323902, H02M 3335, H02M 324

Patent

active

059562420

ABSTRACT:
A switched-mode power supply includes a transformer having a primary winding, a secondary winding and an auxiliary winding. A switching device is included in series with the primary winding for alternately interrupting the flow of current through the primary winding. The switched-mode power supply further includes a controller circuit connected to the auxiliary winding for receiving information related to an output voltage across the secondary winding and for controlling the switching of the switching device so as to maintain the information at a desired level. The controller circuit including a sample-and-hold circuit which is controlled to sample the information related to the output voltage only when there is current flowing in the secondary winding.

REFERENCES:
patent: 4685042 (1987-08-01), Severinsky
patent: 5748462 (1998-05-01), Schoofs
patent: 5757627 (1998-05-01), Faulk
patent: 5768118 (1998-06-01), Faulk et al.
patent: 5841641 (1998-11-01), Faulk

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