12V-220V Modified Sine-wave Inverter Circuit


Posted on Feb 7, 2014

This project is a simple 12V to 220V modified sine-wave inverter using 555 timer IC and CD4017 decade counter. This inverter can deliver 300W continuous power and around 500W max power output (short period). A very good inverter for uninterruptible power supply (UPS). The driver of the inverter is the 555 timer and 4017 decade counter. 555 timer


12V-220V Modified Sine-wave Inverter Circuit
Click here to download the full size of the above Circuit.

generate pulses at a frequency of four times the desired output frequency. For example, if you want a 60Hz output, the timer frequency must be equal to 240Hz (4*60Hz). For 50Hz output, 200Hz is the output of 555. You can try different combination of R1, R2, and C1 to obtain the desired frequency by using the 555 calculator. The use of LM7809 regulator is to protect the 555 and 4017 from voltage spikes and transients that can influence their operation and stability. You can use LM7808, LM7806, or 7805 regulator or any regulator IC available at hand. But take note that the regulator output must be 5V and above to make sure that you can drive the Mosfet Q1, and Q2. The diagram below is the comparison of modified and pure sine wave. Both have the same peak value and RMS value. Part List (60Hz, 220V): R1 – 20 kilo-ohms 1/4W R2 – 20 kilo-ohms 1/4W R3 – 1.2 kilo-ohms 1/4W R4, R6 – 560 ohms 1/4W R5, R7 – 5.6 kilo-ohms 1/4W C1 – 100nF capacitor C2 – 10uF electrolytic capacitor rated 16V C3 – 470uF electrolytic capacitor rated 16V C4 – 100nF capacitor Q1, Q2 – IRFZ44N or similar N-channel power Mosfet X’former – 10V-0V-10V to 220V transformer (minimum 500VA if required) LM7809 – IC regulator LM555 – timer IC CD4017b – 5-stage Johnson counter 12V – 12V lead acid battery




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Berdon   Mar 28, 2019

I just found them and place them at description.

Mathias Werder   Mar 28, 2019

Hey, do you have a plan were all the resistors and capasitors values are given?

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