State-of-the-art switched-capacitor DC-DC power converters mainly focus on low voltage and/or high power applications. However, at high voltage and low power levels, new designs are anticipated to emerge and a power converter that has both high efficiency and high power density is highly desirable. This paper presents such a high voltage low power switched-capacitor DC-DC converter with an input voltage upto 380 V (compatible with rectified European mains) and an output power experimentally validated up to 21.3 W. The wideband gap semiconductor devices of GaN switches and SiC diodes are combined to compose the proposed power stage. Their switching and loss characteristics are analyzed with transient waveforms and thermal images. Different isolated driving circuits are compared and a compact isolated halfbridge driving circuit is proposed. The full-load efficiencies of 98.3% and 97.6% are achieved for the power stage and the complete power converter, without heatsink or airflow. The corresponding power densities are 7.9 W/cm3 and 2.7 W/cm3,based on boxed volumes, respectively.
|Journal||Renewable Energy and Power Quality Journal|
|Number of pages||6|
|Publication status||Published - 2018|
|Event||International Conference on Renewable Energies and Power Quality (ICREPQ’18) - Salamanca, Spain|
Duration: 21 Mar 2018 → 23 Mar 2018
|Conference||International Conference on Renewable Energies and Power Quality (ICREPQ’18)|
|Period||21/03/2018 → 23/03/2018|