Gate driver for a full-bridge lossless switching device
First Claim
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1. A control circuit adapted to drive one switching device of an edge resonant converter bridge circuit comprising:
- a first switch means directly coupled to said switching device and comprising a series of transistors for turning on said switching device;
a second switch means directly coupled to said switching device and comprising a series of transistors for turning off said switching device;
said first switch means including means for disabling operation of said second switch means;
said second switch means including means for disabling operation of said first switch means; and
a voltage sensing means directly coupled to said switching device and comprising a unidirectional current device connected in series relationship with a small switching device for sensing the voltage across said switching device and for turning on said switching device at a time which ensures substantially lossless switching.
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Abstract
A control circuit for a full bridge switching converter including power FET switching devices. The control circuit including a gate driver with a voltage sensor circuit which senses the precise instant to gate the power FET on in order to achieve substantially lossless switching by the converter.
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Citations
8 Claims
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1. A control circuit adapted to drive one switching device of an edge resonant converter bridge circuit comprising:
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a first switch means directly coupled to said switching device and comprising a series of transistors for turning on said switching device; a second switch means directly coupled to said switching device and comprising a series of transistors for turning off said switching device; said first switch means including means for disabling operation of said second switch means; said second switch means including means for disabling operation of said first switch means; and a voltage sensing means directly coupled to said switching device and comprising a unidirectional current device connected in series relationship with a small switching device for sensing the voltage across said switching device and for turning on said switching device at a time which ensures substantially lossless switching. - View Dependent Claims (2)
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3. A control circuit adapted to drive a switching device of an edge resonant voltage converter bridge circuit wherein said control circuit comprises:
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a first circuit means directly coupled to said switching device and comprising a series of transistors arranged to turn on said switching device; a second circuit means directly coupled to said switching device and comprising a series of transistors arranged to turn off said switching device; and a voltage sensing means directly coupled to said switching device and comprising a unidirectional current device connected in series relationship with a small switching device for turning on said switching device when the voltage across said switching devices reaches a predetermined minimum level. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification