Dual-input 18-pulse autotransformer rectifier unit for an aircraft AC-DC converter
First Claim
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1. A passive AC-DC converter comprising:
- an autotransformer, wherein said autotransformer comprises;
a plurality of first high voltage AC inputs;
a plurality of second low voltage AC inputs;
a winding topology having a plurality of windings corresponding to each of multiple phases, said plurality of windings configured such that said autotransformer generates an 18-pulse AC input current waveform, said winding topology having a plurality of phase legs, each phase leg comprising a first winding segment having a turn ratio of 1, a second winding segment having a turn ratio of 1.690, a third winding segment having a turn ratio of 4.668, a fourth winding having a turn ratio of 3.926, a fifth winding segment having a turn ratio of 3.433, a sixth winding segment having a turn ratio of 3.572, and a seventh winding segment having a turn ratio of 3.177, for a step down ratio of 0.9; and
a set of autotransformer outputs;
a bridge rectifier connected to said set of autotransformer outputs; and
a DC output from said bridge rectifier.
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Abstract
A dual-input 18-pulse autotransformer rectifier unit for more electric aircraft AC-DC converter uses an autotransformer with a nine-phase output to condition AC power prior to DC rectifying the AC power.
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Citations
15 Claims
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1. A passive AC-DC converter comprising:
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an autotransformer, wherein said autotransformer comprises; a plurality of first high voltage AC inputs; a plurality of second low voltage AC inputs; a winding topology having a plurality of windings corresponding to each of multiple phases, said plurality of windings configured such that said autotransformer generates an 18-pulse AC input current waveform, said winding topology having a plurality of phase legs, each phase leg comprising a first winding segment having a turn ratio of 1, a second winding segment having a turn ratio of 1.690, a third winding segment having a turn ratio of 4.668, a fourth winding having a turn ratio of 3.926, a fifth winding segment having a turn ratio of 3.433, a sixth winding segment having a turn ratio of 3.572, and a seventh winding segment having a turn ratio of 3.177, for a step down ratio of 0.9; and a set of autotransformer outputs; a bridge rectifier connected to said set of autotransformer outputs; and a DC output from said bridge rectifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A passive AC-DC converter comprising:
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an autotransformer, wherein said autotransformer comprises; a plurality of first high voltage AC inputs; a plurality of second low voltage AC inputs; a plurality of winding segments on each of multiple phase legs of said autotransformer, wherein each of said plurality of winding segments has a turn ratio normalized to a designated winding segment on said phase leg, and each phase leg of said autotransformer comprises a first winding segment having a turn ratio of 1, a second winding segment having a turn ratio of 1.690, a third winding segment having a turn ratio of 4.668, a fourth winding having a turn ratio of 3.926, a fifth winding segment having a turn ratio of 3.433, a sixth winding segment having a turn ratio of 3.572, and a seventh winding segment having a turn ratio of 3.177, for a step down ratio of 0.9; wherein said plurality of winding segments on each phase leg of said autotransformer are configured such that each corresponding output of said nine-phase output is a stepped down voltage relative to an expected AC voltage of said high voltage input, wherein said stepped down voltage is a percentage of said expected AC voltage of said high voltage input, is determined with a step down ratio of 1≧
γ
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0.5, wherein, and is dependent upon said turn ratios of said winding segments;a winding topology having a plurality of windings corresponding to each of multiple phases, said plurality of windings configured such that said autotransformer generates an 18-pulse AC input current waveform; and a set of autotransformer outputs; a bridge rectifier connected to said set of autotransformer outputs comprising a nine phase AC output; and a DC output from said bridge rectifier.
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Specification