Technology development of an intergrated GaN switch power module for totem-pole bridgeless boost converter

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Data centers are the backbone of global economic and consume an enormous amount of energy. U.S data**centers consumed about 70 billion kilowatt-hours of electricity in 2014 and will double that amount by 2020.**An AC - DC rectifier converts the AC grid voltage to the motherboard of the data center to power the CPU,**memory, network ports, etc. It contains two stages. The first stage is the Power Factor Correction (PFC) stage**which converts the AC voltage to 400V DC and the second stage is a DC-DC converter that converts 400V to**12V. It is very important to increase the efficiency of the AC - DC Rectifier.**The existing AC - DC rectifiers use MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) were**developed 40 years ago. The performance of MOSFET has reached its theoretical limits. The new GaN switch**(Gallium Nitride) is a revolutionary advancement in power semiconductor technology and can significantly**improve the efficiency of power supplies. However, there is still a big technical gap between the existing GaN**switch based designs and the optimum designs that could be achieved by GaN switches.**This project will focus on the PFC stage of the data center rectifiers. A half-bridge GaN switch module**technology will be developed and employed in the bridgeless Boost converter to achieve 99% efficiency, which**will only dissipate less than half of the loss of the MOSFET counterpart. This will enable the data center**rectifier to meet the highest Titanium efficiency level of Energy Star 80 PLUS standard. The developed**technology can also be used in the second stage of the data center rectifiers and improve its performance.**With the completion of this project, the Toronto design center of Murata Power Solutions will be able to design**the most efficient data center power supply in the world and expand its sales volume in this market. GaN**Systems will also demonstrate the full potential of their GaN switches used in the server as well as other power**supplies. Therefore, the project will also increase the publicity and sales volume of GaN Systems.**In addition, 5 Highly-Qualified-Personnel (HQP) will be trained in this project.