This thesis presents a study of energy conservation and design a three-phase PWM Voltage source inverter , 2.2 kW/200 Vac . The PWM inverter is applied with three-phase induction motor driving compressing unit in air-conditioner. IPM (Intelligent Power Module) is used as switching device with switching frequency about 6.51 kHz. The temperature in the system is detected by sensoring device. The signal is transported to microcontroller, PIC16F872 , to evaluate. The evaluated signal is transferred to microcontroller, MCS-51 , for controlling IPM. Controlled IPM can change the fundamental frequency of the signal, used to drive compressing unit , according to desired temperature. Consequently, temperature and speed of compressing unit proceed properly. Besides, energy conservation is considered for adjusting parameters of PWM inverter such as starting time, fundamental frequency and operating time. As experimental results, the comparison between air-conditioner using voltage source inverter and conventional air-conditioner is discussed. The results are shown in the conclusion of this thesis.
By
Kangwan Charernkornburee
Charnchai Anggulsutthipantha
Shidsanu Phanitpodjaman
