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 on a primary side of said transformer and configured to control a conductivity of said power switch;
a first delay circuit on said primary side of said transformer and configured to delay an initiation of said conductivity of said power switch in conjunction with a control signal from said first controller;
a second controller on a secondary side of said transformer and configured to enable a conductivity of said synchronous rectifier switch responsive to a voltage difference between two terminals of said synchronous rectifier switch;
a second delay circuit on said secondary side of said transformer and configured to delay an initiation of said conductivity of said synchronous rectifier switch after said conductivity of said power switch is disabled in conjunction with a control signal from said second controller; 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.
406 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 on a primary side of said transformer and configured to control a conductivity of said power switch; a first delay circuit on said primary side of said transformer and configured to delay an initiation of said conductivity of said power switch in conjunction with a control signal from said first controller; a second controller on a secondary side of said transformer and configured to enable a conductivity of said synchronous rectifier switch responsive to a voltage difference between two terminals of said synchronous rectifier switch; a second delay circuit on said secondary side of said transformer and configured to delay an initiation of said conductivity of said synchronous rectifier switch after said conductivity of said power switch is disabled in conjunction with a control signal from said second controller; 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 with a first controller on a primary side of said transformer; delaying an initiation of said conductivity of said power switch in conjunction with a control signal from said first controller with a first delay circuit on said primary side of said transformer; enabling a conductivity of said synchronous rectifier switch responsive to a voltage difference between two terminals of said synchronous rectifier switch with a second controller on a secondary side of said transformer; delaying an initiation of said conductivity of said synchronous rectifier switch after said conductivity of said power switch is disabled in conjunction with a control signal from said second controller with a second delay circuit on said secondary side of said transformer; 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; a synchronous rectifier switch coupled to said secondary winding; and a controller, including; a first controller on a primary side of said transformer and configured to control a conductivity of said power switch, a first delay circuit on said primary side of said transformer and configured to delay an initiation of said conductivity of said power switch in conjunction with a control signal from said first controller, a second controller on a secondary side of said transformer and configured enable a conductivity of said synchronous rectifier switch responsive to a voltage difference between two terminals of said synchronous rectifier switch, a second delay circuit on said secondary side of said transformer and configured to delay an initiation of said conductivity of said synchronous rectifier switch after said conductivity of said power switch is disabled in conjunction with a control signal from said second controller, 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