Robert Neal Dean

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The impact of parallel GaN HEMTs on efficiency of a non-isolated point of load (POL) converter is investigated. The test results indicate how many parallel GaN HEMTs should be used to achieve maximum efficiency based on load current. Loss calculations and simulations provided initial direction, and ten POL converters were tested-only varying the number of(More)
The overall power system can generally be divided into three stages: front end, middle stage and point-of-load (POL). The overall efficiency of the power supply chain is dependent on the multiplicity effect which means each stage should be taken into account. Increases in efficiency of the POL converter have the benefit of reducing extra heat generation(More)
As applications like high performance cloud computing grow exponentially, there is an immediate need for high efficiency high current point of load (POL) converters. Interleaving phases is a common technique to reduce conduction loss, lower output ripple, improve high load performance, and reduce stress on power switching devices. However, multiphase POLs(More)
This work presents experimental results of an optimized five-phase GaN/Si hybrid synchronous buck converter designed to improve low voltage point of load (POL) converter efficiency while meeting increasing load demands typical in high performance computing. The best enhancement-mode GaN HEMTs have very low gate charge, switch much faster than Si, and enable(More)