Self-driven synchronous rectifier circuit
First Claim
1. A power supply, comprising:
- a transformer having a primary winding receiving an input voltage and having first and second windings on a secondary side of the transformer;
a driver winding responsive to the input voltage;
a first power transistor having a first conduction terminal coupled to a first end of the first winding, a second conduction terminal coupled to a ground terminal, and a control terminal coupled to a first end of the second winding;
a second power transistor having a first conduction terminal coupled to a second end of the first winding, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a second end of the second winding;
a first driver transistor having a first conduction terminal coupled to the control terminal of the first power transistor, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a first end of the driver winding;
a second driver transistor having a first conduction terminal coupled to the control terminal of the second power transistor, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a second end of the driver winding;
a first inductor coupled between the first end of the first winding and an output of the power supply; and
a second inductor coupled between the second end of the first winding and the output of the power supply.
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Accused Products
Abstract
A DC-DC power converter has a transformer with a primary side and secondary side. A first power transistor is coupled between a first end of a first winding of the secondary side and a ground terminal. A second power transistor is coupled between a second end of the first winding and the ground terminal. A first driver transistor is coupled to a gate of the first power transistor, and a second driver transistor is coupled to a gate of the second power transistor. A separate driver winding taken off the secondary side of the transformer controls the gates of the first and second driver transistors. First and second inductors are coupled between the opposite ends of the first winding and an output of the power supply. First and second resistors are coupled between the gates of the first and second driver transistors and the ground terminal, respectively.
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Citations
26 Claims
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1. A power supply, comprising:
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a transformer having a primary winding receiving an input voltage and having first and second windings on a secondary side of the transformer; a driver winding responsive to the input voltage; a first power transistor having a first conduction terminal coupled to a first end of the first winding, a second conduction terminal coupled to a ground terminal, and a control terminal coupled to a first end of the second winding; a second power transistor having a first conduction terminal coupled to a second end of the first winding, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a second end of the second winding; a first driver transistor having a first conduction terminal coupled to the control terminal of the first power transistor, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a first end of the driver winding; a second driver transistor having a first conduction terminal coupled to the control terminal of the second power transistor, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a second end of the driver winding; a first inductor coupled between the first end of the first winding and an output of the power supply; and a second inductor coupled between the second end of the first winding and the output of the power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A self-driven synchronous rectification circuit, comprising:
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a transformer having a primary winding receiving an input voltage and having first and second on a secondary side of the transformer; a driver winding responsive to the input voltage; a first power transistor having a first conduction terminal coupled to a first end of the first winding, a second conduction terminal coupled to a ground terminal, and a control terminal coupled to a first end of the second winding; a first driver transistor having a first conduction terminal coupled to the control terminal of the first power transistor, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a first end of the driver winding; and a first inductor coupled between the first end of the first winding and an output of the power supply. - View Dependent Claims (10, 11, 12, 13, 14)
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15. In a power conversion circuit, a transformer having a primary winding receiving an input voltage and having first and second windings on a secondary side of the transformer, the power conversion circuit comprising:
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a driver winding responsive to the input voltage; a first metal oxide semiconductor field effect transistor (MOSFET) having a drain coupled to a first end of the first winding, a source coupled to a ground terminal, and a gate coupled to a first end of the second winding; and a second MOSFET having a drain coupled to the gate of the first MOSFET, a source coupled to the ground terminal, and a gate coupled to a first end of the driver winding. - View Dependent Claims (16, 17, 18)
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19. In a DC-DC power converter, a transformer having a primary side responsive to an input voltage and having a secondary side, the DC-DC power converter comprising:
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a driver winding responsive to the input voltage; a first power transistor having a first conduction terminal coupled to a first end of a first winding of the secondary side, a second conduction terminal coupled to a ground terminal, and a control terminal coupled to a first end of a second winding of the secondary side; and a first driver transistor having a first conduction terminal coupled to the control terminal of the first power transistor, a second conduction terminal coupled to the ground terminal, and a control terminal coupled to a first end of the driver winding. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification