Title: Maximizing Power Density and Efficiency of Single Phase Sine Wave Inverter
          Using HERIC Topology


    The main purpose of this project is to push the limits of usage of inverter in modern day applications. Today multi-million dollar projects like Google Loon, Tesla Motors’ PowerWall and Google’s Little Box Challenge are encouraging to make inverters of smaller size and highest possible efficiency.
   It’s a 450V DC Input, 240 V rms 60 Hz Sine Wave and 2kVA Inverter. The intention is to maximize the efficiency and power density of inverter. Sinusoidal PWM technique is implemented for better efficiency. As the bus voltage is very high i.e 450V DC normal MOSFET can’t handle such a high dv/dt, to avoid that a specially made MOSFET called SUPERFET II from Fairchild are being used. These MOSFETs are capable of handling current as large as 75A and with the Rds(ON) of merely 43 m ohms. Further to diminish the freewheeling current (which flows towards supply during the change of switching of leg of full bridge, which in return distorts the input DC supply voltage waveform and decreases the efficiency.) HERIC (Highly Efficient and Reliable Inverter Concept) is used. It dramatically increases the efficiency by disconnecting the path for freewheeling current during change of switching of legs of MOSFET. Further LCL filter is used for the sinusoidal output. LCL is implemented in T topology. LCL filter is used to avoid voltage drop at higher loads. To minimize the size SMD components are being used of different ICs. A PCB is exclusively made to meet the size requirements.
   Efficiency of >90% and power density of >30W/in3 is expected.

Advisor:   Arsalan A Raheem   

Group Members:

Phone: 03134135053

Name: Faheem Zahid
Phone: 3234468968

Name: M. Faran Hameed
Phone: 03336396792

Name: Muhammad Zeshan
Phone: 03214850546