"This article explores the evolution of Qrr as the forward conduction time transitions from nanosecond-scale pulses to hundreds of nanoseconds versus steady-state (DC) conduction.
Using charge control theory, TCAD simulations, and double-pulse experimental measurements, we show that Qrr accumulates exponentially with forward conduction time, governed by the device’s minority carrier lifetime (tL), and saturates once the conduction period exceeds approximately three-time constants."
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