Aim:            To design solar based H-Bridge inverter using micro controller employing PWM technology.

Introduction: The DC to A.C power converters are known as inverters. In other words, an inverter is a circuit which converters a DC. power into an AC power at a desired output voltage and frequency. This conversion can be achieved either by controlled turn-on and turn-off devices like BJT’S, MOSFET’S, IGBT’S etc. The output voltage waveforms of practical inverters are non sinusoidal. Simple inverters can be classified into half bridge and full bridge inverters.

Working:

In this project we are going to utilize the solar power so that the burden on the existing grids can be reduced to the extent possible. In this the solar energy is converted in to electrical energy using solar panels. We are going to obtain 12V dc from a solar panel. This 12v dc is fed to a step-up transformer through a Mosfet bridge. The required pulses for the Mosfet Bridge are generated by micro controller. As soon as the power is on, the controller will generate the pwm signal required for the Mosfet switches. The pulses are then given to a driver IC which is used to drive the Mosfet Switches. By the switching action of Mosfet switches, dc from solar panel is converted into pure sinusoidal AC voltage of 230v magnitude. The PIC microcontroller is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard PIC16F72 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the PIC is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.

     

The main building blocks of the project are:

1. Solar panels.
2. Charging Circuit.
3. Rechargeable battery.
4. PIC microcontroller.
5. H-bridge Inverter.
6. Step-up transformer.
7. AC Bulb.

     

     

Block Diagram of the project:  

 

   

 

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