UPS - Inverter - Power Generator Circuits

500W low cost 12V to 220V inverter Schematic Circuit Diagram

The 12V DC to 220V AC inverter circuit is designed using IC CD4047. The IC CD4047 acts as a switching pulse oscillating device. The n-channel power MOSFET IRFZ44n acts as a switch. The 12-0-12V secondary transformer is inversely used as a Step-up transformer for converting low AC to High Ac.
Attention: This Circuit is using a high voltage that is lethal. Please take appropriate precautions

Using this circuit you can convert the 12V dc into the 220V Ac. In this circuit 4047 is used to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer.

Components of 500w inverter





C1061 or 2SC1061-2



4.7uf 25v



100K preset – 1

12-0-12v Transformer 10A – 1

Circuit diagram

500W low cost 12V to 220V inverter Schematic Circuit Diagram

The drain pins of the n-channel power MOSFETs IRFZ44 are linked to the secondary pins of the transformer, and the common pin in the secondary winding is connected to the battery positive. The negative connection of the battery is linked to both MOSFET source pins. The MOSFET turns on when the alternate square pulse from Q & Q’ drives it. The secondary winding is then driven to create a different magnetic field. This generated magnetic field generates a high alternate voltage of roughly 220V.

How to calculate the transformer rating
The basic formula is P=VI and between input-output of the transformer we have Power input = Power output
For example, if we want a 220W output at 220V then we need 1A at the output. Then at the input, we must have at least 18.3V at 12V because 12V*18.3 = 220v*1
So you have to wind the step-up transformer from 12v to 220v but the input winding must be capable to bear 20A.

The IRFZ44N is an N-channel MOSFET with a high drain current of 49A and a low Rds value of 17.5 mΩ. It also has a low threshold voltage of 4V at which the MOSFET will start conducting. Hence it is commonly used with microcontrollers to drive with 5V.

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