Flyback converter providing simplified control of rectifier MOSFETS when utilizing both stacked secondary windings and synchronous rectification
AssigneeCiena Corporation
InventorsMichael J. Wingrove, David R. Malecki
Life of this patent
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Abstract
The present invention provides methods and systems for a flyback converter arranged with synchronous rectifier MOSFETS in such a manner that they operate with a common source potential while still providing for the use of a stacked output winding. With a common source potential, a single rectifier control voltage can be used to operate the rectifiers for multiple outputs greatly simplifying the control circuit. Advantageously, the present invention maintains the inherent simplicity of the flyback design while enabling designs with well-regulated multiple voltage outputs and the efficiency benefits of synchronous rectification.
Claims19
A dual-output flyback converter with stacked secondary windings and synchronous rectifiers arranged to provide a common reference for rectifier gate control, comprising:
- a transformer comprising a first secondary winding and second secondary winding, wherein the first secondary winding and the second secondary winding are in a stacked configuration;
- a first synchronous rectifier connected to the first secondary winding;
- and
- a second synchronous rectifier connected to the second secondary winding;
- wherein the first and second synchronous rectifiers are arranged to provide a common reference for gate control of the first and second synchronous rectifier.
A multiple-output flyback converter with stacked secondary windings and synchronous rectifiers arranged to provide a common reference for rectifier gate control, comprising:
- a transformer comprising a plurality of secondary windings, wherein each of the plurality of secondary windings are arranged in a stacked configuration;
- and
- a plurality of synchronous rectifiers arranged to provide a common reference for gate control of the plurality of synchronous rectifiers;
- wherein each of the plurality of synchronous rectifiers are connected to a corresponding stacked secondary winding of the plurality of secondary windings;
- and
- wherein there is a synchronous rectifier for each of the plurality of secondary windings.
A flyback converter with stacked secondary windings and synchronous rectifiers arranged to provide a common reference for rectifier gate control, comprising:
- an input voltage source connected to a transformer primary and a switch;
- a transformer comprising a plurality of secondary windings, wherein the plurality of stacked secondary windings are coupled to the transformer primary through a core, and wherein each of the plurality of secondary windings are arranged in a stacked configuration;
- a plurality of synchronous rectifiers, wherein each of the plurality of synchronous rectifiers are connected to a corresponding stacked secondary winding of the plurality of stacked secondary windings, and wherein the plurality of synchronous rectifiers are arranged to provide a common reference for gate control of the plurality of synchronous rectifiers;
- and
- a plurality of capacitors connected to the outputs of the plurality of secondary windings.
Dependencies are inferred from the claim text.