Dear Community,
I am currently working on managing IGBT switching in the frequency range of 20 kHz to 60 kHz. My setup involves directly applying a PWM signal to a pulse transformer, which successfully drives the IGBT. However, I am encountering an issue where the IGBT occasionally burns out at random intervals. After reviewing some documentation, I suspect this is due to hard switching, and I understand that soft switching could improve efficiency and reliability.
From my research, I learned that soft switching may involve applying a short pulse to the IGBT to initiate an LC tank oscillation, then detecting the zero-crossing point (ZCD) to synchronize the next pulse. However, I am uncertain how to implement this in a half-bridge configuration. Specifically:
Implementation Method: Should I configure a PWM with complementary outputs, or can I achieve this by manually toggling two GPIOs with a controlled delay?
Oscillation Synchronization: How can I effectively read the ZCD signal and synchronize the PWM pulses to match the LC tank’s resonant frequency?
I would greatly appreciate any insights, practical advice, or references to relevant examples or documentation.
