Abstract
Previous research on switched-capacitor DC-DC converters has focused on low-voltage and/or high-power ranges, where the efficiencies are dominated by conduction losses. Switched-capacitor DC-DC converters at high-voltage (> 100 V) and low-power (< 10 W) levels with high efficiency and high power density are anticipated to emerge. This paper presents a switched-capacitor converter with an input voltage up to 380 V (compatible with rectified European mains) and a maximum output power of 10 W. The converter is intended for LED drivers. GaN switches and SiC diodes are analytically compared and actively combined to properly address the challenges at high-voltage low-current levels, where switching losses become significant. Further trade-off between conduction losses and switching losses is experimentally optimized with switching frequencies. Three variant designs of the proposed converter are implemented, and the trade-off between efficiencies and power densities is validated with measurement results. A peak efficiency of 98.6 % and a power density of 7.5 W/cm3 are achieved without heatsink or airflow. The characteristic impedance level of the converter is an order of magnitude higher than previously published ones.DOI: http://dx.doi.org/10.5755/j01.eie.24.3.20979
Highlights
The demand for high efficiency and high power density power converters has been progressing along with advances in industrial and consumer electronics, power conversion architectures, converter circuit topologies, and wide band gap semiconductor technologies
This paper is to present another approach, i.e. the voltage conversion is achieved with a high-voltage low-power switched-capacitor converter, which has not been previously demonstrated in the voltage and power levels
EXPERIMENTAL RESULTS The prototype of the proposed converter is implemented with 2-layers PCB, which has 1 mm PCB-thickness and 2 oz copper-thickness
Summary
The demand for high efficiency and high power density power converters has been progressing along with advances in industrial and consumer electronics, power conversion architectures, converter circuit topologies, and wide band gap semiconductor technologies. The size, weight, cost reduction demands of power supplies are the major drivers in the continuing miniaturization trend [1]. The decrease in volume could be attained only by a simultaneous increase of the efficiency to maintain thermal limits at maximum losses [2]. Increasing the efficiency is the primary development goal and the premise of the realization of smaller and lighter power supplies. The applications such as light-emitting diode (LED) drivers for intelligent lighting systems and miniature chargers. This research was performed in cooperation with Niko-Servodan, Nordic Power Converters, Noliac, DTU Danchip, IPU, SimpLight, and Viso Systems
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