Advanced Phase-Leg Short-Circuit Protection for Third-Generation Semiconductors
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United States of America
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Mar 20, 2025
app pub date -
Sep 18, 2023
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Sep 18, 2023
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Abstract
Shoot-through current flows when a pull-up transistor and a pull-down transistor in series both turn ON at the same time, such as due to noise. The transistor that should be OFF has an OFF drain-source voltage that is high when the other transistor is ON, but quickly falls when the OFF transistor erroneously turns on. A shoot-through protection circuit compares the OFF drain-source voltage of the OFF transistor to a reference voltage. When the OFF drain-source voltage falls below the reference voltage, a fault is signaled. The fault signal immediately disables the ON transistor by driving its gate inactive (low) to stop the shoot-through current. The reference voltage may be a fraction of the power voltage, such as 30% of a 400-volt input power bus, providing over 100 volts noise immunity, preventing false triggering yet immediately blocking current when the reference voltage is passed without waiting for a blanking period.
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