Controller for a Power Converter
First Claim
1. A controller employable with a power converter having a transformer with a primary winding coupled to a power switch and a secondary winding coupled to a synchronous rectifier switch, comprising:
- a first controller configured to control a conductivity of said power switch;
a first delay circuit configured to delay an initiation of said conductivity of said power switch;
a second controller configured to control a conductivity of said synchronous rectifier switch as a function of a voltage difference between two terminals thereof;
a second delay circuit configured to delay an initiation of said conductivity of said synchronous rectifier switch; and
a shutdown circuit configured to substantially disable conductivity of said synchronous rectifier switch before said initiation of conductivity of said power switch.
3 Assignments
0 Petitions
Accused Products
Abstract
A controller for a power converter having a transformer T1 with a primary winding coupled to a power switch SW and a secondary winding coupled to a synchronous rectifier switch SR. In one embodiment, the controller includes a first controller configured to control a conductivity of the power switch SW, and a first delay circuit configured to delay an initiation of the conductivity of the power switch SW. The controller also includes a second controller configured to control a conductivity of the synchronous rectifier switch SR as a function of a voltage difference between two terminals thereof, and a second delay circuit configured to delay an initiation of the conductivity of the synchronous rectifier switch SR. The controller still further includes a shutdown circuit configured to substantially disable conductivity of the synchronous rectifier switch SR before the initiation of conductivity of the power switch SW.
163 Citations
20 Claims
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1. A controller employable with a power converter having a transformer with a primary winding coupled to a power switch and a secondary winding coupled to a synchronous rectifier switch, comprising:
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a first controller configured to control a conductivity of said power switch; a first delay circuit configured to delay an initiation of said conductivity of said power switch; a second controller configured to control a conductivity of said synchronous rectifier switch as a function of a voltage difference between two terminals thereof; a second delay circuit configured to delay an initiation of said conductivity of said synchronous rectifier switch; and a shutdown circuit configured to substantially disable conductivity of said synchronous rectifier switch before said initiation of conductivity of said power switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a controller employable with a power converter having a transformer with a primary winding coupled to a power switch and a secondary winding coupled to a synchronous rectifier switch, comprising:
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controlling a conductivity of said power switch; delaying an initiation of said conductivity of said power switch; controlling a conductivity of said synchronous rectifier switch as a function of a voltage difference between two terminals thereof; delaying an initiation of said conductivity of said synchronous rectifier switch; and substantially disabling conductivity of said synchronous rectifier switch before said initiation of conductivity of said power switch. - View Dependent Claims (10, 11, 12)
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13. A power converter, comprising:
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a transformer having a primary winding and a secondary winding; a power switch coupled to said primary winding; synchronous rectifier switch coupled to said secondary winding; and a controller, including; a first controller configured to control a conductivity of said power switch, a first delay circuit configured to delay an initiation of said conductivity of said power switch, a second controller configured to control a conductivity of said synchronous rectifier switch as a function of a voltage difference between two terminals thereof, a second delay circuit configured to delay an initiation of said conductivity of said synchronous rectifier switch, and a shutdown circuit configured to substantially disable conductivity of said synchronous rectifier switch before said initiation of conductivity of said power switch. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification