Lossless gate drivers for high-frequency PWM switching cells
First Claim
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1. A gate driver circuit for a switching converter having at least one power switching device, comprising:
- at least one pair of gate drive switching devices connected in series in a half-bridge configuration;
a gate drive transformer comprising a primary winding and at least one secondary winding, said primary winding being connected to said gate drive switching devices, said secondary winding being connected to the gate of said power switching device of said switching converter; and
a dc blocking capacitance connected to the primary winding of said gate drive transformer;
said gate drive transformer having a magnetizing inductance designed to store sufficient energy to allow zero-voltage switching of said gate drive switching devices at variable pulse widths, said dc blocking capacitance substantially maintaining a net zero volt-seconds on said primary winding of said gate drive transformer.
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Abstract
A gate driver circuit, including either a full-bridge or a half-bridge configuration of gate drive switching devices, is capable of applying gate drive signals of variable pulse widths in a substantially loss,less manner to power switching devices of a high-frequency resonant switching converter, while providing transformer isolation between the gate drive electronics and the power switching devices.
84 Citations
6 Claims
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1. A gate driver circuit for a switching converter having at least one power switching device, comprising:
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at least one pair of gate drive switching devices connected in series in a half-bridge configuration; a gate drive transformer comprising a primary winding and at least one secondary winding, said primary winding being connected to said gate drive switching devices, said secondary winding being connected to the gate of said power switching device of said switching converter; and a dc blocking capacitance connected to the primary winding of said gate drive transformer; said gate drive transformer having a magnetizing inductance designed to store sufficient energy to allow zero-voltage switching of said gate drive switching devices at variable pulse widths, said dc blocking capacitance substantially maintaining a net zero volt-seconds on said primary winding of said gate drive transformer. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification