Self-synchronized drive circuit for a synchronous rectifier in a clamped-mode power converter
First Claim
1. A power converter having an input and output, comprising:
- a power transformer having primary and secondary windings;
a power switch coupled to said input and configured to impress an input voltage across said primary winding;
a hybridge synchronous rectifier including first and second synchronous rectifier switches series-coupled across said secondary winding and first and second inductors respectively coupled to said first and second synchronous rectifier switches, an output of said hybridge synchronous rectifier available at a node between said first and second inductors; and
a separate drive winding wound on said power transformer and coupled between said first and second synchronous rectifier switches, said separate drive winding configured to alternately energize said first and second synchronous rectifier switches.
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Accused Products
Abstract
A power converter having an input and output and a method of operating the power converter. In one embodiment, the power converter includes a power transformer having primary and secondary windings and a power switch coupled to the input and configured to impress an input voltage across the primary winding. The power converter further includes a hybridge synchronous rectifier coupled to the secondary winding and including first and second synchronous rectifier switches. The power converter still further includes a separate drive winding wound on the power transformer and coupled between the first and second synchronous rectifier switches. The separate drive winding is configured to alternately energize the first and second synchronous rectifier switches.
94 Citations
40 Claims
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1. A power converter having an input and output, comprising:
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a power transformer having primary and secondary windings; a power switch coupled to said input and configured to impress an input voltage across said primary winding; a hybridge synchronous rectifier including first and second synchronous rectifier switches series-coupled across said secondary winding and first and second inductors respectively coupled to said first and second synchronous rectifier switches, an output of said hybridge synchronous rectifier available at a node between said first and second inductors; and a separate drive winding wound on said power transformer and coupled between said first and second synchronous rectifier switches, said separate drive winding configured to alternately energize said first and second synchronous rectifier switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a power converter having an input and output, comprising:
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providing a power transformer having primary and secondary windings; impressing an input voltage across said primary winding with a power switch coupled to said input; coupling a hybridge synchronous rectifier to said secondary winding, said hybridge synchronous rectifier including first and second synchronous rectifier switches series-coupled across said secondary winding and first and second inductors respectively coupled to said first and second synchronous rectifier switches, an output of said hybridge synchronous rectifier available at a node between said first and second inductors; and alternately energizing said first and second synchronous rectifier switches with a separate drive winding wound on said power transformer and coupled between said first and second synchronous rectifier switches. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A power converter having an input and output, comprising:
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a first and second power transformer each having primary and secondary windings; a power switch, coupled to said input, that impresses an input voltage across said primary windings; a synchronous rectifier coupled to said secondary windings and including first and second synchronous rectifier switches; and first and second drive windings, separate from said secondary windings, wound on said first and second power transformers, respectively, and coupled to said first and second synchronous rectifier switches, respectively, said first and second drive windings configured to alternately energize said first and second synchronous rectifier switches, respectively. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of operating a power converter having an input and output, comprising:
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providing a first and second power transformer each having primary and secondary windings; impressing an input voltage across said primary windings with a power switch coupled to said input; coupling a synchronous rectifier to said secondary windings and including first and second synchronous rectifier switches; and alternately energizing said first and second synchronous rectifier switches with first and second drive windings separate from said secondary windings and wound on said first and second power transformers, respectively. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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Specification