Fritz Mulder
- Apr 27, 2015
- 4
- Joined
- Apr 27, 2015
- Messages
- 4
Hi Guys. I'm busy building a modified sine wave inverter based on a schematic I found on the internet. I'm using a Pic18f452 for my controller and IRFZ44 mosfets. Currently I'm testing the inverter using a very small centre tap transformer to switch 12vdc to 220V AC at 50hz. The problem is the primary input voltage is bad looking due to the transformer primary being switched causing back emf and there is nothing in the circuit to absorb the voltage spikes. I need help with a snubber circuit of something to clamp down these voltage spikes. I have included pictures of the circuit diagram, unloaded Mosfet output waveforms and the transformer Primary voltage waveform. Any help would be appreciated. Thanks