Abstract
This article presents the analysis and design of a resonant power factor correction (PFC) rectifier for the first stage in single-phase front-end offline converters targeting low-power applications (up to 100 W). With the addition of a charge-pump circuit comprised of a capacitor and a diode to a class-DE resonant converter, PFC functionality is achieved inherently. The operation is based on soft switching, allowing for increased switching frequencies with reduced switching losses. A 1-MHz prototype employing wide bandgap switching devices is built and tested to validate the analysis and proposed design method. The prototype achieves up to 50 W of output power with a power factor of 0.99, a total harmonic distortion of 8.6%, and an efficiency of up to 88%; with harmonic magnitudes well-within the IEC 61000-3-2 standard class-C device limits, making it suitable for use as the rectifier stage in light-emitting diode (LED) drivers. Despite the additional circuit stresses from the charge-pump operation, the proposed converter offers simplicity and low component overhead, with the potential for higher frequency operation toward higher power densities.
Highlights
WITH the current trend towards smaller and highly portable consumer electronics and other industrial applications, research has been investigating the opportunities for minimizing the weights and sizes of products form factors, while achieving the same performance
This paper presents the analysis and design of a resonant power factor correction (PFC) rectifier for the first stage in single-phase front-end offline converters targeting low-power applications
The operation is based on soft switching, allowing for increased switching frequencies with reduced switching losses
Summary
WITH the current trend towards smaller and highly portable consumer electronics and other industrial applications, research has been investigating the opportunities for minimizing the weights and sizes of products form factors, while achieving the same performance. Pulse-width-modulated (PWM) converters have been the primary candidate for the AC-DC stage in offline converters, including buck [3]-[6], boost [7][8], buck-boost [9][10], flyback [11], and SEPIC [12][13] converters They can provide high power factor and are easy to control. That in turn results in reduced sizes for the passive components, and higher power densities, higher loop-gain bandwidths, and faster transient responses This has led to the investigation of their adoption into different applications conventionally dominated by PWM converters, including DC-DC [18]-[29] and AC-DC conversion [30]-[35].
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