Bakez
Member level 1
I have an single phase inverter (or H-Bridge) with Silicon Carbide MOSFETs
The gate drivers have two DCDC power supplies in order to create a -2V to 20V gate voltage swing (one for the negative and one for the positive).
I am running all the gate drivers from one supply. When I turn on the inverter with a low input voltage, the gate drivers work fine, however as I increase the input voltage the gate drivers start to draw more and more current from the power supply and also the voltage the power supply outputs drop dramatically. Does anyone know why this is?
Is it because my gate driver is heating up, or needing to draw more power when the MOSFETs are being switched at a higher voltage or other reasons?
I think maybe the fact I have absolutely no input filter capacitor on any of the 8 DCDC converters that I am supplying out of one power supply could be a reason too.
The gate drivers have two DCDC power supplies in order to create a -2V to 20V gate voltage swing (one for the negative and one for the positive).
I am running all the gate drivers from one supply. When I turn on the inverter with a low input voltage, the gate drivers work fine, however as I increase the input voltage the gate drivers start to draw more and more current from the power supply and also the voltage the power supply outputs drop dramatically. Does anyone know why this is?
Is it because my gate driver is heating up, or needing to draw more power when the MOSFETs are being switched at a higher voltage or other reasons?
I think maybe the fact I have absolutely no input filter capacitor on any of the 8 DCDC converters that I am supplying out of one power supply could be a reason too.