Testing a Mitsubishi Electric/PRX PM600HSA120 "Intellimod" IGBT out of an elevator drive...
The little chip connected to the IGBT is a HCPL-4504 Optoisolator
The circuit generating the PWM is a simple 555 timer.
The yellow trace on top on the oscilloscope is the waveform between the collector and emitter of the transistor, and the green trace on the bottom is the waveform being fed into the optoisolator.
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