SECONDARY-SIDE CONTROL CIRCUIT, CONTROL METHOD AND FLYBACK CONVERTER THEREOF
First Claim
1. A control circuit for controlling a secondary-side rectifier switch of a flyback converter, the control circuit comprising:
- a) a slope parameter detection circuit configured to detect a slope parameter of a secondary-side detection voltage along a predetermined direction, and to generate a slope detection signal that represents said slope parameter, wherein said secondary-side detection voltage is configured to represent a voltage across a secondary winding of said flyback converter; and
b) a switch control signal generator configured to generate a switching control signal to control said secondary-side rectifier switch to turn on when said slope detection signal is greater than a slope parameter threshold, and a relationship between said secondary-side detection voltage and an ON threshold value meets a predetermined requirement.
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Accused Products
Abstract
A method of controlling a secondary-side rectifier switch of a flyback converter, can include: detecting a slope parameter of a secondary-side detection voltage along a predetermined direction, where the secondary-side detection voltage is configured to represent a voltage across a secondary winding of the flyback converter; and controlling the secondary-side rectifier switch to turn on when the slope parameter is greater than a slope parameter threshold, and a relationship between the secondary-side detection voltage and the ON threshold meets a predetermined requirement.
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Citations
20 Claims
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1. A control circuit for controlling a secondary-side rectifier switch of a flyback converter, the control circuit comprising:
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a) a slope parameter detection circuit configured to detect a slope parameter of a secondary-side detection voltage along a predetermined direction, and to generate a slope detection signal that represents said slope parameter, wherein said secondary-side detection voltage is configured to represent a voltage across a secondary winding of said flyback converter; and b) a switch control signal generator configured to generate a switching control signal to control said secondary-side rectifier switch to turn on when said slope detection signal is greater than a slope parameter threshold, and a relationship between said secondary-side detection voltage and an ON threshold value meets a predetermined requirement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of controlling a secondary-side rectifier switch of a flyback converter, the method comprising:
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a) detecting a slope parameter of a secondary-side detection voltage along a predetermined direction, wherein said secondary-side detection voltage is configured to represent a voltage across a secondary winding of said flyback converter; and b) controlling said secondary-side rectifier switch to turn on when said slope parameter is greater than a slope parameter threshold, and a relationship between said secondary-side detection voltage and said ON threshold meets a predetermined requirement. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification