Extended range DC-DC power converter circuit
First Claim
1. A power converter, comprising:
- a power transformer having a split-primary winding with a tap connected between first and second primary winding ends, and a secondary winding flux coupled to the primary winding;
input means for receiving an input voltage;
output means for providing an output voltage;
a transinductor having a primary winding connected between said input means and said split-primary winding tap, and having a secondary winding flux-coupled to the transinductor primary winding;
first and second power switching means each for controllably causing a flow of current from an associated different one of said first and second primary winding ends;
unidirectional-conduction means coupled to both said transformer secondary winding and said transinductor secondary winding for rectifying flux-coupled energy to provide an output voltage Vo to said output means; and
means for operating said power switching means in a cyclic fashion, and for controlling only a duty-cycle of the power switching means to maintain the output voltage Vo at a preselected level.
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Accused Products
Abstract
A single-stage power converter has an input-to-output transfer characteristic with two portions, each having a different operational characteristic, with each portion being selected by changing ONLY the duty-cycle of the power switching devices. At low input voltage the converter operates as a Boost converter, while operating as a Buck converter for greater input voltages. This transfer characteristic is provided by a circuit wherein the primary winding center tap of a split-primary power transformer is coupled through an inductive element, with one of the pair of push-pull power switching devices connected to each primary winding end. Secondary winding rectification and filtering provides the power supply output in the Boost mode, and a portion of the power supply output in the Buck mode. The remainder of the Buck-mode output is supplied by the energy stored in the inductive element, preferably by use of a secondary winding on a transinductor (multiple-winding inductive) element having a primary winding providing the energy-storing inductance L.
65 Citations
16 Claims
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1. A power converter, comprising:
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a power transformer having a split-primary winding with a tap connected between first and second primary winding ends, and a secondary winding flux coupled to the primary winding; input means for receiving an input voltage; output means for providing an output voltage; a transinductor having a primary winding connected between said input means and said split-primary winding tap, and having a secondary winding flux-coupled to the transinductor primary winding; first and second power switching means each for controllably causing a flow of current from an associated different one of said first and second primary winding ends; unidirectional-conduction means coupled to both said transformer secondary winding and said transinductor secondary winding for rectifying flux-coupled energy to provide an output voltage Vo to said output means; and means for operating said power switching means in a cyclic fashion, and for controlling only a duty-cycle of the power switching means to maintain the output voltage Vo at a preselected level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification