Arrangement for demagnetizing a transformer

Details Arrangement for demagnetizing a transformer Arrangement for demagnetizing a transformer

2005-03-01

2005-03-01

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021060

Reexamination Certificate

active

06862197

ABSTRACT:
To demagnetize a transformer (TR) in a single-ended forward DC/DC converter with self-driven synchronized rectifiers (V1, V2) connected across the secondary winding (N2) of the transformer (TR), a diode (D1) is connected in series with a capacitor (C1) across the primary winding (N1) of the transformer. The diode (D1) transfers magnetization energy stored in the transformer to the capacitor (C1) every time a primary switch (V3) of the converter is turned off. To ensure optimum efficiency of the synchronized rectifiers, a discharging circuit is connected to the capacitor (C1) for discharging the magnetization energy stored therein by drawing a DC current (I) from the capacitor (C1) in response to varying input DC voltage such that complete demagnetization of the transformer (TR) always is attained just before turn-on of the primary switch (V3).

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