Offline synchronous rectifying circuit with sense transistor...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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C363S089000

Reexamination Certificate

active

07911813

ABSTRACT:
A synchronous rectifying circuit of a resonant switching power converter is provided to improve the efficiency. The synchronous rectifying circuit includes a power transistor and a diode connected to a transformer and an output ground of the power converter for rectifying. A sense transistor is coupled to the power transistor for generating a mirror current correlated to a current of the power transistor. A controller generates a driving signal to control the power transistor in response to a switching-current signal. A current-sense device is coupled to the sense transistor for generating the switching-current signal in response to the mirror current. The controller enables the driving signal to turn on the power transistor once the diode is forwardly biased. The controller generates a reset signal to disable the driving signal and turn off the power transistor once the switching-current signal is lower than a threshold.

REFERENCES:
patent: 3921035 (1975-11-01), Holmes
patent: 4694402 (1987-09-01), McEachern et al.
patent: 5055703 (1991-10-01), Schornack
patent: 5920475 (1999-07-01), Boylan et al.
patent: 5929615 (1999-07-01), D'Angelo et al.
patent: 6191964 (2001-02-01), Boylan et al.

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