This Modified Sine Wave Inverter frequency rate is 50Hz, give you 240V AC output. Powered by the 2 pieces of power MOSFETs STP55NF06L, the inverter capable to deliver up to 500W power. The PIC16F628A is programmed to produce a logic 5v signal for 5ms at pin 17 then 15ms off. Then the same at pin 18, 5ms on then 15ms off (4.17ms for 60Hz). That is one cycle which is then looped.
The MOSFET’s could be in parallel pairs for even more power. Just give each its own 470Ω gate resistor and a 22kΩ from each gate to source. The large 1000µF capacitor and 47Ω resistor used to clean up the voltage spikes coming from the transformer centre tap into the positive rail and protect the PIC from them.
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