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US 2026/0074686 A1Published application
Fast turn-on protection of a cascode switch
AssigneePower Integrations, Inc.
InventorRajko DUVNJAK
Life of this patent
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Abstract
Fast turn-on protection of a cascode switch is presented herein. A cascode circuit includes a depletion mode field effect transistor and an enhancement mode field effect transistor electrically coupled in cascode. During turn-on, a protection circuit detects an overcurrent fault by observing a plateau of a cascode node voltage. An overcurrent fault may be detected in response to the plateau existing for greater than a threshold time duration.
Claims10
A method of detecting overcurrent in a cascode circuit comprising:
- turning on the cascode circuit with a transient step;
- receiving a cascode node voltage;
- determining a period when the cascode node voltage gradually decreases by comparing the cascode node voltage with a threshold voltage;
- and
- indicating an overcurrent fault in response to the period existing for greater than a threshold time duration.
2 more elements
Dependencies are inferred from the claim text.