Rectifier
AssigneeROLLS-ROYCE plc
InventorsDavid R. Trainer, Ellis F H Chong, Jonathan M. Stevens
Life of this patent
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Abstract
An AC to DC conversion device has first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator, an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform, and a waveform generator. The waveform generator comprises an output coupled to the DC output of the H-bridge rectification device, and is configured to input a unidirectional waveform to the DC output having the same magnitude and fundamental frequency as the rectified back EMF, phase shifted by a predetermined angle relative to the rectified back EMF waveform.
Claims20
An AC to DC conversion device comprising:
- first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator;
- an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform;
- and
- a waveform generator comprising an output coupled to the DC output of the H-bridge rectification device, and configured to input a unidirectional waveform to the DC output, the unidirectional waveform having the same magnitude and fundamental frequency as the rectified back EMF waveform, phase shifted by a predetermined angle δ relative to the rectified back EMF waveform.
A method of operating an AC to DC conversion device, said AC to DC conversion device comprising:
- first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator;
- an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform;
- and
- a waveform generator comprising an output coupled to the DC output of the H-bridge rectification device, and configured to input a unidirectional waveform to the DC output, the unidirectional waveform having the same magnitude and fundamental frequency as the rectified back EMF waveform, phase shifted by a predetermined angle δ relative to the rectified back EMF waveform;
- wherein the method comprises providing a unidirectional waveform to the DC output, the unidirectional waveform having the same magnitude and fundamental frequency as the rectified back EMF, phase shifted by a predetermined angle relative to the rectified back EMF waveform.
Dependencies are inferred from the claim text.