Synchronous rectifier circuit
First Claim
1. A self-driven synchronous rectifier circuit applied to a forward converter, comprising:
- a transformer having a primary winding and a secondary winding for converting an input voltage into an output voltage, wherein said secondary winding further comprises a driving winding having a center tap;
a first synchronous rectifier switch and a second synchronous rectifier switch connected to said secondary winding for rectifying said output voltage; and
an auxiliary switch, wherein the gate terminal thereof is connected to the gate terminal of said first synchronous rectifier switch and the positive end of said driving winding, the source terminal thereof is connected to the negative end of said driving winding, and the drain terminal thereof is connected to the gate terminal of said second synchronous rectifier switch.
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Abstract
A self-driven synchronous rectifier circuit applied to a forward converter is provided. The circuit includes a transformer having a primary winding and a secondary winding for converting an input voltage into an output voltage, a first synchronous rectifier switch and a second synchronous rectifier switch connected to the secondary winding for rectifying the output voltage; and an auxiliary switch, wherein the gate terminal thereof is connected to the gate terminal of the first synchronous rectifier switch and the positive end of the secondary winding, the source terminal thereof is connected to the drain terminal of the first synchronous rectifier switch and the negative end of the secondary winding, and the drain terminal thereof is connected to the gate terminal of the second synchronous rectifier switch.
21 Citations
19 Claims
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1. A self-driven synchronous rectifier circuit applied to a forward converter, comprising:
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a transformer having a primary winding and a secondary winding for converting an input voltage into an output voltage, wherein said secondary winding further comprises a driving winding having a center tap;
a first synchronous rectifier switch and a second synchronous rectifier switch connected to said secondary winding for rectifying said output voltage; and
an auxiliary switch, wherein the gate terminal thereof is connected to the gate terminal of said first synchronous rectifier switch and the positive end of said driving winding, the source terminal thereof is connected to the negative end of said driving winding, and the drain terminal thereof is connected to the gate terminal of said second synchronous rectifier switch. - View Dependent Claims (2, 3, 4, 5)
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6. A self-driven synchronous rectifier circuit, comprising:
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a transformer having a primary winding and a secondary winding for converting an input voltage into an output voltage;
a first synchronous rectifier switch and a second synchronous rectifier switch connected to said secondary winding for rectifying said output voltage; and
an auxiliary switch, wherein the gate terminal thereof is connected to the gate terminal of said first synchronous rectifier switch and the positive end of said secondary winding, the source terminal thereof is connected to the drain terminal of said first synchronous rectifier switch and the negative end of said secondary winding, and the drain terminal thereof is connected to the gate terminal of said second synchronous rectifier switch. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A self-driven synchronous rectifier circuit, comprising:
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a transformer having a primary winding and a secondary winding for converting an input voltage into an output voltage, wherein said secondary winding further comprises a driving winding having a center tap;
a first synchronous rectifier switch and a second synchronous rectifier switch connected to said secondary winding for rectifying said output voltage; and
an auxiliary switch having a gate terminal connected to the gate terminal of said first synchronous rectifier switch and the positive end of said driving winding, a source terminal connected to the negative end of said driving winding and a drain terminal connected to the gate terminal of said second synchronous rectifier switch such that when a reset of said transform is finished, voltage across said second synchronous rectifier is kept substantially constant and said second synchronous rectifier continuously conducts, thereby reducing simultaneous conduction of said first synchronous rectifier switch and said second synchronous rectifier switch. - View Dependent Claims (16, 17, 18, 19)
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Specification