Abstract
Critical conduction mode (CRM) boost power factor correction (PFC) front end is one of the most popular solutions to universal ac–dc applications below 300 W for its simplicity and high efficiency. However, its power density is largely limited by the need for a relatively bulky inductor and a buffer capacitor. This article introduces a new PFC front end that enables simultaneous size reduction of both the inductor and the buffer capacitor by achieving zero-voltage-switching of all switches and active power buffering. A 100-W universal input prototype is built, measuring a 96.7% peak efficiency and 50.8-W/in <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{3}$</tex-math></inline-formula> power density. Compared to a typical CRM boost PFC front end, the prototype achieves a 47% size reduction of the magnetics, a 21% size reduction of the buffer capacitor, and an almost constant dc-link voltage, while maintaining comparable efficiency performance.
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