On-time control for constant current mode in a flyback power...

Details On-time control for constant current mode in a flyback power... On-time control for constant current mode in a flyback power...

2007-05-07

2008-10-28

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021080, C363S021160

Reexamination Certificate

active

07443700

ABSTRACT:
A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the primary side peak current and off-time for the next cycle. This control mechanism does not need the knowledge of input voltage or magnetizing inductance. Therefore, it removes the sensitivities of input voltage and magnetizing inductance to the output current limit. Furthermore, it uses a time measurement instead of a voltage measurement for the current calculation which in many cases is easier to perform.

REFERENCES:
patent: 6166927 (2000-12-01), Farrington et al.
patent: 6760203 (2004-07-01), Usui
patent: 7362593 (2008-04-01), Yang et al.
patent: 2008/0067994 (2008-03-01), Kesterson et al.

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