Composite ac-to-dc power converter using wye architecture
AssigneeHoneywell International Inc.
InventorsEVGENI GANEV, WILLIAM WARR, KEMING CHEN
Life of this patent
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Abstract
A composite power conversion method using a WYE asymmetrical autotransformer that converts electrical power from AC to DC uses two or more conversion methods in parallel and provides a passive technique that “splits” the input 3-phase voltages into additional phases, so that the number of DC rectification pulses is increased to improve AC line current THD The WYE asymmetric autotransformer topology provides a potential improvement in size/weight and efficiency compared to former asymmetric autotransformers.
Claims17
A composite AC-to-DC power converter comprising:
- an asymmetric autotransformer where each leg of the autotransformer satisfies a WYE-architecture transformer vector diagram constructed using vertices of an equilateral triangle wherein an arc swung between the vertices is equal to a length of one leg of the triangle;
- a main bridge rectifier receiving a majority portion of current from an autotransformer;
- and
- a plurality of auxiliary bridge rectifiers, each receiving output from each leg of the autotransformer.
A method for converting AC power to DC power with an AC-to-DC power converter, the method comprising:
- passing a first portion of a load current through a main rectifier;
- passing a second portion of the load current though an autotransformer, wherein each leg of the autotransformer satisfies a WYE-architecture transformer vector diagram constructed using vertices of an equilateral triangle wherein an arc swung between the vertices is equal to a length of one leg of the triangle;
- and
- rectifying the output from the autotransformer with a plurality of auxiliary bridge rectifiers, each of the auxiliary bridge rectifiers receiving the output from each leg of the autotransformer.
A method for reducing the total harmonic distortion (THD) of an AC-to-DC power converter, the method comprising:
- passing a substantial portion of a load current through a main rectifier;
- passing the remaining portion of a load current though an autotransformer, wherein each leg of the autotransformer satisfies a WYE-architecture transformer vector diagram constructed using vertices of an equilateral triangle wherein an arc swung between the vertices is equal to a length of one leg of the triangle;
- and
- rectifying the output from the autotransformer with a plurality of auxiliary bridge rectifiers.
Dependencies are inferred from the claim text.