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A Bridgeless, Quasi-Resonant ZVS-Switching, Buck-Boost Power Factor Correction Stage (PFC) ABSTRACT: This paper presents a new bridgeless, quasi-resonant zero voltage switching (ZVS), buck boost power factor correction stage (PFC). The elimination of the input rectifier leads to a higher level of efficiency, especially at low input voltages. Several bridgeless PFC circuits already exist, but the proposed new converter also achieves ZVS in a wide operating range with significant reduced switching losses and some other benefits. EXISTING SYSTEM: Due to the elimination of the full-bridge input rectifier, the components in the current path are reduced and this results in fewer conduction losses. There are several bridgeless PFC topologies already published, for example the “Basic Bridgeless Boost PFC”, “Dual Boost Bridgeless PFC”, “Totem-Pole Bridgeless Boost PFC” or “True Bridgeless PFC Converter”. In a power supply, these PFC stages are often followed by an isolated DC-DC converter with a transformer to achieve an isolated output with a lower output voltage. The “True Bridgeless PFC Converter” is different. This converter could be extended to an isolated converter without adding an additional DC-DC stage. DISADVANTAGE: A converter soft start with completely discharged output capacitor. Overvoltage across the switch during turn off. CIRCUIT DIAGRAM: (“True Bridgeless PFC Converter”) PROPSED SYSTEM: This circuit always offers a low impedance commutation path for the input inductor current, meaning there is no overvoltage across the switch during the turn-off transition. This PFC is a special buck-boost converter. A startup without additional component stress is possible. It should be noted that the converter voltage gain has no similarities with a conventional buck-boost converter. Compared to the known bridgeless topologies, the proposed topology has a negligible inrush current. The circuit makes zero voltage switching possible. ADVANTAGE: Inrush current limitation is not necessary. The switching losses are reduced significantly. CIRCUIT DIAGRAM: (the bridgeless, quasi-resonant ZVS switching, buck-boost power factor correction stage (PFC)) References: [1] D. Miller, R. Kennel, M. Reddig, “New methods for digitally controlled bridgeless PFC converters”, Proceedings of the Intellec 2013, Hamburg, Germany, 13-17 Oct. 2013. [2] S. Cuk, “True bridgeless PFC converter achieves over 98% efficiency, 0.999 power factor”, Power Electronics Technology Magazine, July 2010. [3] S. Nigsch, S. Cuk, K. Schenk, “Analysis, Modeling and Design of a True Bridgeless Single Stage PFC with Galvanic Isolation”, Proceedings of the APEC 2015, Charlotte, NC, 15-19 March 2015.