Sine wave power inverter

[mincing]

Thanks Sougatha!

However I am building SI with Full bridge and isolation transformer.

My Dc input to bridge is 48V DC.

I am using optically isolated gate drivers.I need a 4 output power supply with isolation.

I am looking for suggestions.

[sougata]

Hi,

I mentioned TLP250 for the gate drivers. They have an optically isolated input and a totem pole output. It works great with IGBTs too. While your DC input is 48 volts be carefull about choosing the MOSFETs . Generally MOSFETs with greater breakover voltage have higher RdsOn. While it may seem logical to use a 100volts MOSFETs for the design. Please note that hard turn off of the MOSFETs connected to inductive load causes ringing in the drain as well as gate. So surges may kill them. Snubbers are recommended and fully avalanche rated MOSFETs should be used. If you keep your PWM frequency lower that will result in lower switching losses however may produce audible noise.

Best of luck in your design.

[mincing]

I have selected Mosfets with very low Rds on about 5mOhmm and 100V, 100A devices.


I also have optically isolated drivers from Avago ,but how about the power supply to these devices on output side i.e.Totempole and ground.I understand that a four out put supply with 18V and current? is required.
Is there any other means or method to escape this!

If you could suggest that Power supply cky that will be great.