TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Wittmann, Jürgen
A1  - Funk, Tobias
A1  - Rosahl, Thoralf
A1  - Wicht, Bernhard
T1  - A 48-V wide-Vin 9–25-MHz resonant DC–DC converter
JF  - IEEE journal of solid state circuits
N2  - This paper presents a wide-Vin step-down parallel-resonant converter (PRC), comprising an integrated 5-bit capacitor array and a 300-nH resonant coil, placed in parallel to a conventional buck converter. Soft-switching resonant converters are beneficial for high-Vin multi-MHz converters to reduce dominant switching losses, enabling higher switching frequencies. The output filter inductor is optimized based on an empirical study of available inductors. The study shows that faster switching significantly reduces not only the inductor value but also volume, price, and even the inductor losses. In addition, unlike conventional resonant concepts, soft-switching control as part of the proposed PRC eliminates input voltage-dependent losses over a wide operating range, resulting in 76.3% peak efficiency. At Vin = 48 V, a loss reduction of 35% is achieved compared with the conventional buck converter. Adjusting an integrated capacitor array, and selecting the number of oscillation periods, keeps the switching frequency within a narrow range. This ensures high efficiency across a wide range of Vin = 12–48 V, 100–500-mA load, and 5-V output at up to 25-MHz switching frequency. Thanks to the low output current ripple, the output capacitor can be as small
as 50 nF.
KW  - buck converter
KW  - inductors
KW  - multi-MHz switching
KW  - resonant dc–dc converter
KW  - soft-switching
Y1  - 2018
SN  - 0018-9200
SS  - 0018-9200
U6  - https://doi.org/10.1109/JSSC.2018.2827953
DO  - https://doi.org/10.1109/JSSC.2018.2827953
VL  - 53
IS  - 7
SP  - 1936
EP  - 1944
S1  - 9
PB  - IEEE
CY  - New York, NY
ER  -