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The number of power supplies connected to the public household power grid is constantly increasing. For a good mains voltage quality, the harmonic input currents are limited in standards. Many applications also require a lower output voltage with isolation. Today, this is mostly obtained via a multi-stage converter, consisting of a diode bridge rectifier, a boost PFC and a DC-DC converter with galvanic...
All electronic devices on the market have to comply with the valid standards regarding electromagnetic compatibility. This paper presents an efficient holistic procedure to analyze the surge voltage immunity of a modern power supply topology based on the bridgeless boost power factor correction stage. The procedure forms a structured process flow and allows a simple but effective analysis process...
Nowadays, most of the electronic consumer devices like televisions, PCs, routers and various chargers include a switching mode power supply (SMPS). In combination with this, an electromagnetic interference (EMI) line filter is always required to fulfill the standards and to ensure a correct operation. Therefore, facts like a high efficiency level, low costs and small construction sizes are always...
Compared with conventional CCM PFC converters, bridgeless PFC converters can achieve higher efficiency because of reduced conduction losses. However, since boost inductor lies in ac side, there are some difficulties in the control of such a circuit. Inductor current measuring and input voltage sensing are two main issues. Usually, current measuring techniques in bridgeless PFC are either very expensive...
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