Synchronous rectifying for soft switching power converters

Details Synchronous rectifying for soft switching power converters Synchronous rectifying for soft switching power converters

2007-10-26

2011-12-06

Behm, Harry (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S021060, C363S021140

Reexamination Certificate

active

08072787

ABSTRACT:
An synchronous rectifying apparatus or synchronous rectifying circuit of a soft switching power converter is provided to improve the efficiency. The integrated synchronous rectifying circuit includes: a power transistor connected from a transformer to the output of the power converter for rectifying; a controller having a latch circuit generates a drive signal to control the power transistor in response to a switching signal generated by a winding of the transformer in response to the switching of the transformer. The controller turns off the power transistor when the switching signal is lower than a low-threshold. The power transistor is turned on when the switching signal is higher than a high-threshold. Furthermore, a maximum-on-time circuit provided in the controller is applied to generate a maximum-on-time signal for limiting the maximum on time of the power transistor.

REFERENCES:
patent: 5774350 (1998-06-01), Notaro et al.
patent: 2006/0072349 (2006-04-01), Lin
patent: 2007/0263421 (2007-11-01), Kyono
patent: 2008/0043504 (2008-02-01), Ye et al.
CN Office Action mailed Apr. 2, 2010.

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