Case 14449


High Efficiency Resonant Power Convertor Using Lossless Impedance Control Network 



High efficiency Power Conversion, Impedance Control Network



Power conversion, Data centers and Server farms



The state of the art power convertors are large and heavy.  Increasing switching frequency reduces size and mass. However the increase in switching frequency escalate switching and magnetic losses, thereby reducing converter efficiency as well as requiring larger heat sinks that are larger and heavier, thus negating the effect of higher switching. Resonant converters can achieve higher efficiency at higher switching frequencies. Varying switching frequency (Frequency controlled) allows operation of  resonant converters under varying loads, but varying frequency prohibit optimization of magnetic components and EMI filters, thereby limiting the range within which high efficiency operation is realized. Most fixed frequency solutions have excessive losses and lower efficiencies at partial loads. Partial loads are very common in large data center, e.g., where the requirement for very high availability and redundancy out weights the need for efficiency.



The invention involves a resonant power converter architecture operating at fixed frequency that can achieves very high efficiency (over 90%) over a wide operating range. The converter uses lossless impedance control networks and associated controls. The architecture achieves zero voltage switching (ZVS) and near zero current switching (ZCS) simultaneously In addition, this architecture allows bi-directional power flow.



·         High efficiency over a wide operating range

·         Reduces size and mass of power electronics



·         Professor David J. Perreault (Department of Electrical Engineering and Computer Science, MIT)

·         Professor Khurram K. Afridi (Department of Electrical Engineering and Computer Science, MIT)


Intellectual Property:

U.S. Patent Application Serial Number 61/608375, filed on March 8, 2012


Last revised:  April 3, 2013

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