Details
| Original language | English |
|---|---|
| Pages (from-to) | 1936-1944 |
| Number of pages | 9 |
| Journal | IEEE Journal of Solid-State Circuits |
| Volume | 53 |
| Issue number | 7 |
| Early online date | 9 May 2018 |
| Publication status | Published - Jul 2018 |
Abstract
This paper presents a wide- V in 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- V in 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 V in=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 V in = 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.
Keywords
- Buck converter, inductors, multi-MHz switching, resonant dc-dc converter, soft-switching
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
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In: IEEE Journal of Solid-State Circuits, Vol. 53, No. 7, 07.2018, p. 1936-1944.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A 48-V Wide-Vin 9-25-MHz Resonant DC-DC Converter
AU - Wittmann, Jürgen
AU - Funk, Tobias
AU - Rosahl, Thoralf
AU - Wicht, Bernhard
N1 - Publisher Copyright: © 2018 IEEE.
PY - 2018/7
Y1 - 2018/7
N2 - This paper presents a wide- V in 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- V in 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 V in=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 V in = 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.
AB - This paper presents a wide- V in 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- V in 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 V in=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 V in = 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
UR - http://www.scopus.com/inward/record.url?scp=85046805517&partnerID=8YFLogxK
U2 - 10.1109/jssc.2018.2827953
DO - 10.1109/jssc.2018.2827953
M3 - Article
VL - 53
SP - 1936
EP - 1944
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
SN - 0018-9200
IS - 7
ER -