Sundstrand Corporation

Hamilton Sundstrand Corporation

Graham T Fordyce

Gregory I Rozman

Ian Tinkler

Stephen R Jones

Barry T Drager

Terry J Milroy

An inverter receives a DC power supply and converts it into AC power to a primary coil of a high frequency transformer. The output of the high frequency transformer passes through two secondary coils, and each secondary coil is associated with a bus. The busses supply positive and negative AC power to a downstream output. The flow of the power from the two busses is alternatively controlled to provide a desired frequency on the output.

Inverter with high frequency isolation transformer

An integrated inductive assembly includes first and second inductive elements each comprising a winding wherein winding axes of the windings are perpendicular to one another. In addition, the first and second inductive elements are carried adjacent one another by a bracket.

Integrated inductive assembly

A drive circuit for a voltage controlled power switching device includes a transformer, a full-wave rectifier bridge coupled to the transformer, first and second capacitors connected in series between nodes of the full-wave rectifier bridge and first and second controlled switches coupled between a control electrode of the power switching device and the first and second capacitors, respectively, wherein each controlled switch has a control electrode coupled to a secondary winding of the trans-former. Current is provided by the first capacitor to the control electrode of the power switching device through the first controlled switch at the beginning of a negative pulse appearing at the secondary winding of the transformer and charging current is provided to the first capacitor from the secondary winding of the transformer through the full-wave rectifier bridge after the beginning of the negative secondary pulse. Current is drawn from the control electrode of the power switching device through the second controlled switch to the second capacitor at the beginning of a positive pulse appearing across the secondary winding and charging current is provided to the second capacitor from the secondary winding of the transformer through the full-wave rectifier bridge after the beginning of the positive pulse.

Gate drive for a power switching device

A control for operating an inverter coupled to a switched reluctance machine includes a relative angle estimation circuit for estimating rotor angle for a phase in the switched reluctance machine. The relative angle estimation circuit estimates a phase voltage and thereby calculates phase flux linkage to estimate the rotor angle.

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Rockford, IL, United States of America

Graham T Fordyce