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US 2020/0287475 A1Published application
Power converters, power distribution systems and methods of converting power
AssigneeHamilton Sundstrand Corporation
InventorFrank Z. Feng
Life of this patent
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Abstract
A dual-output AC-DC power converter with balanced DC output voltages is described. The DC power source has balanced DC voltage outputs relative to DC midpoint irrespective of DC load imbalance. The input to the power source is three-phase four-wire AC voltage source. Current draws from the AC three-phase voltage source have 12-pulse near sinusoidal waveform. Ripple voltage from DC positive rail to DC negative rail is 12-pulse.
Claims20
An AC-DC power converter, comprising:
- an AC feeder;
- an autotransformer connected to the AC feeder;
- a rectifier connected to the autotransformer;
- a DC midpoint terminal connected to the rectifier;
- and
- an AC source neutral phase lead connected to the DC midpoint terminal to fix voltage at the DC midpoint terminal to voltage at an AC source neutral phase.
3 more elements
A method of converter AC power into DC power, comprising:
- receiving AC power from a 3-phase AC source having a neutral phase through an AC feeder at an AC-DC power converter, the AC-DC power converter having an autotransformer connected to the AC feeder, a rectifier connected to the autotransformer, wherein the DC midpoint terminal connected to the rectifier, and an AC source neutral phase lead connected to the DC midpoint terminal;
- dividing the AC power into a first phase group and a second phase group;
- phase shifting the second phase group relative to the first phase group;
- rectifying the AC power in the first and second phase groups;
- and
- applying the rectified AC power as positive and negative voltages relative to the neutral phase of the 3-phase AC source.
3 more elements
Dependencies are inferred from the claim text.