Resonant converter with controlled inductor
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United States of America Patent
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-
Nov 4, 1997
Grant Date -
N/A
app pub date -
Dec 8, 1995
filing date -
Dec 8, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An LC resonant circuit for a resonant converter includes a resonant capacitor and an inductor coupled to a fixed frequency AC supply. A controlled inductor in parallel with the resonant capacitor is controlled by a DC current to vary its inductance. The controlled inductor comprises a magnetic core having one or more power windings, and a control winding wound on the core. The DC current in the control winding produces core flux which effects core permeability. The controlled inductor has the effect of changing the capacitor impedance and thus influences the converter output. Multiple, independently controlled and regulated outputs may be driven by one power switching stage.
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