Synchronous rectification circuit for power converters
DCFirst Claim
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1. A synchronous rectification circuit of the power converter, comprising:
- a power switch, coupled to a transformer for rectification; and
a switching-control circuit, generating a control signal in response to a magnetized voltage of the transformer, a demagnetized voltage of the transformer, and a magnetization period of the transformer,wherein the control signal is coupled to control the power switch, and the enable period of the control signal is correlated to a demagnetization period of the transformer.
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Abstract
A synchronous rectification circuit for power converters operable under fixed and/or variable frequencies where no current sense circuit or phase-lock circuit are needed is provided. It has a power switch coupled to a transformer for the rectification. A signal-generation circuit is used for generating a control signal in response to a magnetized voltage of the transformer, a demagnetized voltage of the transformer, and a magnetization period of the transformer. The control signal is coupled to turn on the power switch. The enable period of the control signal is correlated to a demagnetization period of the transformer.
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11 Claims
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1. A synchronous rectification circuit of the power converter, comprising:
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a power switch, coupled to a transformer for rectification; and a switching-control circuit, generating a control signal in response to a magnetized voltage of the transformer, a demagnetized voltage of the transformer, and a magnetization period of the transformer, wherein the control signal is coupled to control the power switch, and the enable period of the control signal is correlated to a demagnetization period of the transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A synchronous rectification apparatus for a power converter, comprising:
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a power switch, coupled to a magnetic device for rectification; and a switching-control circuit, generating a control signal coupled to control the power switch in response to a magnetized voltage of the magnetic device and a magnetization period of the magnetic device, wherein the enable period of the control signal is correlated to a demagnetization period of the magnetic device. - View Dependent Claims (9, 10, 11)
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Specification