Method for controlling transformer excitation cycles and...

Details Method for controlling transformer excitation cycles and... Method for controlling transformer excitation cycles and...

2007-12-18

2007-12-18

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S097000, C363S131000

Reexamination Certificate

active

11605234

ABSTRACT:
The present invention discloses a method for controlling transformer excitation cycles and a circuit for controlling the same, wherein the excitation cycle and the demagnetization cycle, which determine the rise and fall of the excitation current, are modified to prevent the coil from being saturated. In the present invention, a sense current is acquired from the excitation current of the transformer coil, and a demagnetization reference value is set. The sense current is used to determine whether the excitation current is lowered to the demagnetization reference value in the demagnetization cycle. A cycle modifying circuit is used to modify the duty cycle signal output by a pulse control unit until the excitation current is lowered to a preset level.

REFERENCES:
patent: 6392906 (2002-05-01), L'Hermite et al.
patent: 6535400 (2003-03-01), Bridge
patent: 6862197 (2005-03-01), Eriksson

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