Here is a 100 watt inverter circuit using a minimum number of components. I think it is quite difficult to make a decent one like this with other components. I have to use CD 4047 IC from Texas Instruments to generate the 100 Hz pulses and four 2N3055 transistors to boost the load.
The IC1 Cd4047 wired as an astable multivibrator produces two 100 Hz phase trains of 180 degrees. These pulse trains are preamplified by the two TIP122 transistors. The outputs of the TIP 122 transistors are amplified by four 2N 3055 transistors (two transistors for each half cycle) to drive the inverter transformer. The 220V AC will be available in the transformer secondary. No complex just the elemental principle of the inverter and the circuit works very well for small loads like some bulbs or fans.If you need just a low cost inverter in the 100 W region, then this is the best.