Ruprecht-Karls-Universität Heidelberg

Design and modelling of a high-efficient single-phase PFC-Rectifier Power-Supply

Master Thesis by Eduard Fast


While consumer desires devices with higher performance, higher efficiency and minimal losses are demanded in order to save energy. Recently, the Gallium-Nitride technology matured and has entered the commercial semiconductor market. This benefits the bridgeless totem pole rectifier topology with power factor correction (PFC). This thesis presents the development of a high-efficiency, high-density, single-phase high-power-factor rectifier with the totem-pole BLPFC topology. The presented work begins with an elaboration and comparison of bridgeless topologies and materials with wide bandgap (WBG). The advantages and challenges of utilizing WBG materials are discussed. Continuous conduction mode operation with average current mode control is used to achieve high-efficiency and high-quality output characteristics. GaN-HEMTs are used with a soft-switching behavior to ensure low electromagnetic interference. The aim is to achieve a high power density through a high operating frequency. To verify this approach a parameterized mixed-signal model of the regulated totem-pole BLPFC was implemented with Cadence Virtuoso. The power circuit is simulated in Spice, while the control is implemented with the hardware description language Verilog AMS.


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