Now a day’s many industrial applications have begun to require high power. Some appliances in the industries however require medium or low power for their operation. Using a high-power source for all industrial loads may prove beneficial to some motors requiring high power, while it may damage the other loads. Some medium voltage motor drives and utility applications require medium voltage. The multi level inverter has been introduced since 1975 as alternative in high power and medium voltage situations. The Multi level inverter is like an inverter and it is used for industrial applications as alternative in high power and medium voltage situations. The proposed project presents A Cascaded Half-Bridge Three-Level Inverter with Pulse Width Modulated (PWM) control scheme. The main aim of the project is design and development of a Three level inverter using PWM signals by using ARDUINO UNO Microcontroller. The voltages across the cascaded half-bridges are subsequently boosted, and the output voltage is stepped up due to the cascaded connection. To design a Three level inverter circuit, we are using MOSFETs. This project proposes a new single-phase three-level converter based on switched PWM technique. PWM switching control scheme comes with advantages over the traditional multilevel fundamental switching scheme. One benefit of PWM methods employing much higher switching frequencies concerns harmonics. The harmonic’s filtering exercise is much easier and cheaper due to the fact that the undesirable harmonics occur at much higher switching frequencies. Also, the produced harmonics might be above the bandwidth of some actual system. This means that there is no power dissipation caused by the harmonics. On the contrary, multilevel fundamental switching scheme creates harmonics at lower switching frequencies and this increased the complexity of the filtering activity. In this project we are using IRF540Mosfets for designing the three-half h-bridge inverter circuits which can generate PWM signals to the mosfets by Arduino UNO microcontroller.    

The main objective of this project is:

 

• Design of Cascaded Half-Bridge Three-Level Inverter.
• Using PWM technique for switching the mosfets.
• Using ARDUINO Microcontroller to achieve this task.

  The major building blocks of this project are:  

1. Regulated power supply.
2. Step down transformer.
3. Charging circuit.
4. Battery
5. Arduino UNO microcontroller.
6. MOSFETS
7. Three Half bridge circuits.

  Software’s used:

1. Embedded C programming.
2. Arduino IDE for dumping code into Microcontroller.
3. Express SCH for Circuit design.

     

Regulated Power Supply:

     

Block diagram:

video: