This project presents the design and implementation of a solar-powered seven-level multilevel inverter using a PIC microcontroller to efficiently convert DC power into high-quality AC output. The system integrates renewable solar energy and conventional grid charging through regulated charging circuits to charge a battery bank, ensuring uninterrupted power availability. A PIC microcontroller generates precise PWM signals to control the switching of power electronic devices in the seven-level inverter topology. The multilevel structure significantly reduces total harmonic distortion (THD), switching losses, and electromagnetic interference compared to conventional two-level inverters, resulting in a near-sinusoidal output waveform. The generated AC output is stepped up using a transformer to drive AC loads such as bulbs. The proposed inverter offers improved efficiency, better power quality, and reliable operation, making it suitable for renewable energy systems, standalone solar applications, and low-cost power backup solutions. In this project we are using IRF540Mosfets for designing the three h-bridge inverter circuits which can generate PWM signals to the mosfets by PIC microcontroller.      

The main objective of this project:  

  To design and develop a solar-powered seven-level multilevel inverter using a PIC microcontroller.

  To generate high-quality AC output with reduced harmonic distortion compared to conventional inverters.

  To implement PWM-based control for efficient switching of power devices in the multilevel inverter.

  To utilize solar energy and battery storage for reliable and uninterrupted power supply.

  To improve overall system efficiency and reduce switching losses using multilevel inverter topology.

  To demonstrate the applicability of the system for renewable energy and standalone power applications.  

The major building blocks of this project are:  

1. Regulated power supply.
2. Step down transformer.
3. Solar panels.
4. Charging circuit.
5. Battery.
6. PIC microcontroller.
7. Reset Button.
8. Crystal oscillator.
9. LED indicators.
10. MOSFETs.
11. Half bridge circuits.
12. Step up transformer.
13. AC Bulb.

  Software’s used:

1. PIC C compiler software for embedded C programming.
2. PIC Kit 2 software programmers for dumping code into PIC Microcontroller.
3. Express SCH for Circuit design.

 

Regulated Power Supply:

       

Block diagram:

       

video: