Adaptive threshold control system for detecting and adjusting the duration of regions of operation during transistor turn on and turn off

Abstract

A system comprises a buffer circuit coupled to a comparator, and an adaptive threshold control circuit coupled to a timer and comparator. Buffer circuit receives a first voltage across a control terminal and a first current terminal of a transistor and a second voltage across a second current terminal and the first current terminal of the transistor. Comparator compares first voltage to a first threshold, generating a first trigger signal when it crosses first threshold, and compares second voltage to a second threshold, generating a second trigger signal when it crosses second threshold. Timer determines length of time between trigger signals. Adaptive threshold control circuit generates a first control signal for first trigger signal, and a second control signal for second trigger signal, and provides a control signal to comparator indicative of whether length of time is greater than or less than user-programmed value, causing comparator to adjust first threshold.