The document outlines a project to design an efficient pure sine wave inverter using a microcontroller that can operate AC loads from a 24V battery. The objectives are to 1) minimize cost of conventional square wave inverters by generating pure sine waves, 2) generate sine waves from solar panels with less dependency on fossil fuels, and 3) reduce circuit complexity using a microcontroller. The proposed solution uses a PIC16F877A microcontroller to generate PWM signals and drive MOSFETs in an H-bridge circuit to produce high efficiency pure sine wave output at lower cost than traditional designs. Components required and the overall project approach are documented. The status is currently constructing the H-bridge circuit.

1. Objective
1. To design an inverter that can be derived by 24v battery and can be used to operate ac loads while minimizing the
conventional inverter cost and increasing efficiency by replacing square wave or quasi square wave inverters with pure
sine wave inverter.
2. Generation of a pure sine wave signal from a solar panel reducing the dependency on the fossil fuels and limited energy
source .
3. Reduction of circuit’s complexity by using micro-controller to generate modulating signal .
High efficiency
Low standby losses
High Surge capacity
Low harmonic distortion

2. Introduction
• Electronic devices run on AC power, however, most of the methods of power generation produce a DC voltage so
it is necessary to convert the voltage into a source that devices can use. Hence a need for power rating inverter
to smoothly operate electrical and electronic appliances.
• Most of the commercially available inverters are actually square wave or quasi square wave inverters. Electronic
devices run by this inverter will damage due to harmonic contents . Available sine wave inverters are expensive
and their output is not so good . We will try to use SPWM (Sine Pulse Width Modulation) to reduce harmonics
and increase efficiency.
• Microcontrollers today have advanced multitasking capabilities ,greatly reducing no. of components in circuits
which will lower production cost.
• Our approach will be to replace the conventional method with PIC16F877A microcontroller.

3. Problems Identified:
1. Square wave or Quasi square wave Inverters are Cheap but Less efficient and Pure Sine wave inverters are
Efficient but more Expensive.
2. Complexity in circuits of Pure Sine wave Inverters.
Solution Proposed:
• We will use PIC16F877A microcontroller to increase efficiency and reduce circuits complexity(thus reducing
overall cost).
• Using SPWM technique will help in reducing cost of generating pure sine wave .

4. Components required
S.No Components Required Quantity
1 Resistors 12
2 Capacitors 10
3 MOSFET 4
4 Voltage Regulator 2
5 Ir2110 (MOSFET Driver IC) 2
6 Diodes 2
7 Microcontroller 1
8 PCB Board 1
9 LED 1
10 Heat Sinks 6
11 Battery 1
12 Inductors 2

5. Project Approach
• The following sections detail each component within the project, as well as how each section is constructed and
interacts with other blocks to result in the production of a pure sine wave power inverter
Signal generator
Microcontroller
MOSFET
Drivers
H-
Bridge Filter Output
Voltage
Regulator
Battery DC-DC Step-Up

6. References
A. A. Mamun, M. F. Elahi, M. Quamruzzaman , M. U. Tomal , “Design and Implementation of Single Phase
Inverter” International Journal of Science and Research (IJSR)
B. Gopinath, PG and Arikesh “Development of Three Step Charging H-Bridge based Sine wave Inverter”
International Journal of Advanced Trends in Computer Science and Engineering
C. Principles and Application of Electrical Engineering McGraw hill

7. Current Status(ongoing)
We have started from constructing H-Bridge

8. Power Inverter using Microcontroller
Name of Group members Project Guide:
1.Md Aman Mazhar (1809721049) Dr. Reena Sharma
2.Nishant Jaiswal (1809721056)
3.Maaz Ahmad (1809721044)
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