I have a circuit as shown here and the expected waveforms are shown besides. When iL>0, the mosfet Q1 and diode D2 conducts the current and vice versa.
I see in the practical circuit implementation that the switch Q1 conducts current when no turn on voltage (Vgs1) is provided to Q1. Can someone please explain this behavior happening here. It would be really helpful. I have attached the waveforms obtained from oscilloscope to show this behaviour. The blue color waveform is a current iL through the branch shown in the circuit diagram . Ideally when iL<0, switch Q2 and diode D1 is conducting. As soon as iL=0 the switch Q1 block the voltage Vac, but what is seen from the oscilloscope is that Q1 conducts for some duration the current even when Vgs1=0V. What is the explanation for this? The diodes used here are Schottky barrier diodes.
I see in the practical circuit implementation that the switch Q1 conducts current when no turn on voltage (Vgs1) is provided to Q1. Can someone please explain this behavior happening here. It would be really helpful. I have attached the waveforms obtained from oscilloscope to show this behaviour. The blue color waveform is a current iL through the branch shown in the circuit diagram . Ideally when iL<0, switch Q2 and diode D1 is conducting. As soon as iL=0 the switch Q1 block the voltage Vac, but what is seen from the oscilloscope is that Q1 conducts for some duration the current even when Vgs1=0V. What is the explanation for this? The diodes used here are Schottky barrier diodes.