Publication: Design a 24 v dc-to-230 v ac 100w single-phase inverter for photovoltaic application
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Date
2009-04-01
Authors
Tiang, Tow Leong
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Abstract
In this project, a 100W single phase full bridge inverter will be designed and constructed to convert 24VDC to 230VAC for photovoltaic application. The application used in this project is to control the speed of the single phase induction motor. The speed of the induction motor is changing when the frequency of the single phase inverter is changed. The inverter has been divided into two main parts. That is switching circuit and single phase full bridge inverter. The switching circuit is implemented by using PIC microcontroller, optocoupler and MOSFET driver. There are two types of switching technique i.e. SPWM and single PWM switching techniques. The switching circuit will trigger the power MOSFETs by sending the signal to the gate. The frequency of the inverter will be change if the switches are pressed and send the signal to the microcontroller. The single phase full bridge inverter is built by using four power MOSFETs and the input voltage is 24V. The output voltage of the inverter is stepped up by using a transformer to 230Vrms to run the induction motor. The frequency range is from 30Hz to 70Hz and the speed of the motor is from 754 rpm to 2020 rpm. The efficiency of the inverter is about 84.5%. The THD output voltage of SPWM switching technique is 5.6 % while the THD output voltage of single PWM switching technique is 42.5 % for a resistive load of 300 Ω. PSIM is a simulation tools that used to simulate the project. The hardware is implemented on veroboard and breadboard as well as constructed on the plastic.