High efficiency AC to DC power conversion system
First Claim
1. A high efficiency power conversion system comprising:
- a transformer having at least one primary winding and one secondary winding;
at least two power distribution buses electrically connected to said primary winding, said power distribution buses each formed of at least two conductive layers separated by an insulating layer, the thickness of each of the conductive layers not exceeding five skin depths;
at least two output power buses; and
two or more switching elements, each of said switching elements coupled between one of said power distribution buses andone of said output power buses.
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Accused Products
Abstract
The present invention locates the primary winding of a transformer in a configuration where it substantially surrounds the secondary winding of the transformer in order to enhance the efficiency of the electromagnetic coupling. High magnetic permeability material surrounds portions of the primary winding of the transformer. The transformer is designed to efficiently operate at frequencies of approximately 50 kilohertz. In one preferred embodiment, the primary winding of the invention is formed of two U-shapes in which the parallel members of the U are substantially longer than the bottom portion of the U. The two U-shapes form a rectangular shape and the substantially parallel rectangular portions are surrounded by high magnetic permeability material to further enhance the electromagnetic coupling between the primary coil winding and the secondary coil winding. In another embodiment, the primary winding of the invention may be rectangular in shape. A strip line layout of the output of the secondary is formed of conductive and insulating layers laminated together. A power bus is configured to have a distributed inductance and is formed of two planer conductors to create a distributed capacitance which substantially cancels the effect of the distributed inductance.
12 Citations
16 Claims
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1. A high efficiency power conversion system comprising:
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a transformer having at least one primary winding and one secondary winding; at least two power distribution buses electrically connected to said primary winding, said power distribution buses each formed of at least two conductive layers separated by an insulating layer, the thickness of each of the conductive layers not exceeding five skin depths; at least two output power buses; and two or more switching elements, each of said switching elements coupled between one of said power distribution buses and one of said output power buses. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10)
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7. A high efficiency power conversion system comprising:
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a transformer having at least one primary winding and one secondary winding, said primary winding coupled to a high frequency AC voltage source; at least two laminated power distribution buses, each distribution bus for electrically connecting to a leg of said secondary winding; a positive DC bus; a negative DC bus; one or more switching elements electrically coupled between said power distribution buses and said positive DC bus; one or more switching elements electrically coupled between said power distribution buses and said negative DC bus; and wherein said laminated power distribution buses, said positive DC bus, and said negative DC bus include means to minimize parasitic effects at high frequency and high power operation of said power conversion system. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification