DC-DC FLYBACK CONVERTER HAVING A SYNCHRONOUS RECTIFICATION SELF-DRIVEN CIRCUIT
First Claim
1. A DC-DC flyback converter, which comprises:
- a primary power circuit;
a secondary power circuit including a synchronous rectifier having first and second output terminals; and
a self-driven circuit, wherein the self-driven circuit includes a negative voltage removal circuit for removing negative voltage between the output terminals of the synchronous rectifier and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition.
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Accused Products
Abstract
A DC-DC flyback converter, includes a three-winding transformer; a primary power circuit having a first MOSFET connected to a first winding of the transformer; a secondary power circuit connected to a second winding of the transformer terminals; and a self-driven circuit connected to a third winding of the transformer. The secondary power circuit includes a synchronous rectifier in the form of a second MOSFET and the self-driven circuit further includes a delay drive circuit, an isolation differential circuit, a negative removal circuit having a third MOSFET and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition.
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Citations
20 Claims
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1. A DC-DC flyback converter, which comprises:
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a primary power circuit;
a secondary power circuit including a synchronous rectifier having first and second output terminals; and
a self-driven circuit, wherein the self-driven circuit includes a negative voltage removal circuit for removing negative voltage between the output terminals of the synchronous rectifier and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition. - View Dependent Claims (2)
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3. A DC-DC flyback converter, which comprises:
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a three-winding transformer;
a primary power circuit connected to a first winding of the transformer;
a secondary power circuit connected to a second winding of the transformer, the secondary power circuit further including a synchronous rectifier having first and second output terminals; and
a self-driven circuit connected to a third winding of the transformer, wherein the self-driven circuit further includes a negative voltage removal circuit for removing negative voltage between the output terminals of the synchronous rectifier and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A DC-DC flyback converter, which comprises:
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a three-winding transformer;
a primary power circuit connected to a first winding of the transformer;
a secondary power circuit connected to a second winding of the transformer, the secondary power circuit further including a synchronous rectifier having first and second output terminals; and
a self-driven circuit connected to a third winding of the transformer, wherein the self-driven circuit further includes a delay drive circuit, an isolation differential circuit, a negative removal circuit and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition. - View Dependent Claims (10, 11, 12, 14, 16)
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- 13. A DC-DC flyback converter in accordance with claim 13, wherein the delay drive circuit includes a delay circuit and a drive circuit.
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20. A DC-DC flyback converter, which comprises:
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a three-winding transformer;
a primary power circuit connected to a first winding of the transformer, wherein the primary power circuit further includes a first MOSFET, and an input capacitor;
a secondary power circuit connected to a second winding of the transformer, the secondary power circuit further including a second MOSFET and an output capacitor; and
a self-driven circuit connected to a third winding of the transformer, wherein the self-driven circuit further includes a delay drive circuit, an isolation differential circuit, a synchronous rectifier trigger switch-off circuit, a negative voltage removal circuit including a third MOSFET, a Zener Diode and a resistor and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition.
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Specification