In above standard 3-ph IGBT based inverter circuit suppose Diode D4 is carrying current because of inductive nature of load. If corresponding igbt Q4 gets gate pulses in this freewheeling interval then whether current will be transferred to igbt from diode as it happens in MOSFET called as "synchronous rectification" (which is used to minimize conduction loss because of diode)? In short if PWM signal is applied to an igbt whose freewheeling diode is conducting will that igbt get destroyed/overheated? second doubt is if collector of a high side igbt is not connected to voltage source while bootstrap capacitor is fully charged then upon applying gate pulse to high side igbt it will get turned ON?
third doubt is if an igbt is rated for 600V 10A then can i operate that igbt at down to 1A or even below 500mA? also can i turn on it for collector to emitter voltage of 25V?