A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications

Nameer Khan; James Xu; Gerard Villar-Piqué; John Pigott; Henk Jan Bergveld; Alaa El Sherif; Olivier Trescases

A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications

Nameer Khan
, James Xu
, Gerard Villar-Piqué
, John Pigott
, Henk Jan Bergveld
, Alaa El Sherif
, Olivier Trescases

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

This paper presents an auxiliary-assisted 5: 1 Series-Capacitor (SC) buck converter for fast transient re-sponse in 48V Point-of-Load (PoL) automotive applications. The 5: 1 SC buck converter, which is imple-mented as the main hybrid stage, regulates the auxiliary buffer capacitor voltage, VAUX , and consequently, delivers the average load power. By regulating VAUX , the main hybrid stage facilitates the creation of an ancillary voltage bus for on-board electronics. The high-frequency auxiliary stage precisely regulates the output voltage, VOUT with a Ripple-Based Constant On-Time (RB-COT) control scheme, by utilizing the energy stored in the buffer capacitor, CAUX . With no stringent transient requirements on VAUX , the main stage is optimized to deliver the average load power, while the auxiliary stage is designed for high-frequency operation. A 50W, 48V-to-0.8V experimental prototype was built to validate the pro-posed architecture. Load transients from 5 A to 29 A were applied to the prototype, resulting in an output voltage deviation of 60 mV. The system achieves a peak efficiency of 89.5% with an output capacitance of only 720μF and an auxiliary capacitance of 120μF

Original language	English
Title of host publication	2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe)
Publisher	Institute of Electrical and Electronics Engineers
Number of pages	8
ISBN (Electronic)	978-9-0758-1539-9
ISBN (Print)	978-1-6654-8700-9
Publication status	Published - 17 Oct 2022
Externally published	Yes
Event	24th European Conference on Power Electronics and Applications, EPE 2022 ECCE Europe - Hannover, Germany Duration: 5 Sept 2022 → 9 Sept 2022 Conference number: 24

Conference

Conference	24th European Conference on Power Electronics and Applications, EPE 2022 ECCE Europe
Abbreviated title	EPE'22 ECCE Europe
Country/Territory	Germany
City	Hannover
Period	5/09/22 → 9/09/22

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Khan, N., Xu, J., Villar-Piqué, G., Pigott, J., Bergveld, H. J., El Sherif, A., & Trescases, O. (2022). A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications. In 2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe) Article 9907658 Institute of Electrical and Electronics Engineers. https://ieeexplore.ieee.org/document/9907658

@inproceedings{c0af07246a084c1e81de96f8c1c663b3,

title = "A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications",

abstract = "This paper presents an auxiliary-assisted 5: 1 Series-Capacitor (SC) buck converter for fast transient re-sponse in 48V Point-of-Load (PoL) automotive applications. The 5: 1 SC buck converter, which is imple-mented as the main hybrid stage, regulates the auxiliary buffer capacitor voltage, VAUX , and consequently, delivers the average load power. By regulating VAUX , the main hybrid stage facilitates the creation of an ancillary voltage bus for on-board electronics. The high-frequency auxiliary stage precisely regulates the output voltage, VOUT with a Ripple-Based Constant On-Time (RB-COT) control scheme, by utilizing the energy stored in the buffer capacitor, CAUX . With no stringent transient requirements on VAUX , the main stage is optimized to deliver the average load power, while the auxiliary stage is designed for high-frequency operation. A 50W, 48V-to-0.8V experimental prototype was built to validate the pro-posed architecture. Load transients from 5 A to 29 A were applied to the prototype, resulting in an output voltage deviation of 60 mV. The system achieves a peak efficiency of 89.5\% with an output capacitance of only 720μF and an auxiliary capacitance of 120μF ",

author = "Nameer Khan and James Xu and Gerard Villar-Piqu{\'e} and John Pigott and Bergveld, \{Henk Jan\} and \{El Sherif\}, Alaa and Olivier Trescases",

year = "2022",

month = oct,

day = "17",

language = "English",

isbn = "978-1-6654-8700-9",

booktitle = "2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe)",

publisher = "Institute of Electrical and Electronics Engineers",

address = "United States",

note = "24th European Conference on Power Electronics and Applications, EPE 2022 ECCE Europe, EPE'22 ECCE Europe ; Conference date: 05-09-2022 Through 09-09-2022",

}

Khan, N, Xu, J, Villar-Piqué, G, Pigott, J, Bergveld, HJ, El Sherif, A & Trescases, O 2022, A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications. in 2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe)., 9907658, Institute of Electrical and Electronics Engineers, 24th European Conference on Power Electronics and Applications, EPE 2022 ECCE Europe, Hannover, Lower Saxony, Germany, 5/09/22. <https://ieeexplore.ieee.org/document/9907658>

A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications. / Khan, Nameer; Xu, James; Villar-Piqué, Gerard et al.
2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe). Institute of Electrical and Electronics Engineers, 2022. 9907658.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications

AU - Khan, Nameer

AU - Xu, James

AU - Villar-Piqué, Gerard

AU - Pigott, John

AU - Bergveld, Henk Jan

AU - El Sherif, Alaa

AU - Trescases, Olivier

N1 - Conference code: 24

PY - 2022/10/17

Y1 - 2022/10/17

N2 - This paper presents an auxiliary-assisted 5: 1 Series-Capacitor (SC) buck converter for fast transient re-sponse in 48V Point-of-Load (PoL) automotive applications. The 5: 1 SC buck converter, which is imple-mented as the main hybrid stage, regulates the auxiliary buffer capacitor voltage, VAUX , and consequently, delivers the average load power. By regulating VAUX , the main hybrid stage facilitates the creation of an ancillary voltage bus for on-board electronics. The high-frequency auxiliary stage precisely regulates the output voltage, VOUT with a Ripple-Based Constant On-Time (RB-COT) control scheme, by utilizing the energy stored in the buffer capacitor, CAUX . With no stringent transient requirements on VAUX , the main stage is optimized to deliver the average load power, while the auxiliary stage is designed for high-frequency operation. A 50W, 48V-to-0.8V experimental prototype was built to validate the pro-posed architecture. Load transients from 5 A to 29 A were applied to the prototype, resulting in an output voltage deviation of 60 mV. The system achieves a peak efficiency of 89.5% with an output capacitance of only 720μF and an auxiliary capacitance of 120μF

AB - This paper presents an auxiliary-assisted 5: 1 Series-Capacitor (SC) buck converter for fast transient re-sponse in 48V Point-of-Load (PoL) automotive applications. The 5: 1 SC buck converter, which is imple-mented as the main hybrid stage, regulates the auxiliary buffer capacitor voltage, VAUX , and consequently, delivers the average load power. By regulating VAUX , the main hybrid stage facilitates the creation of an ancillary voltage bus for on-board electronics. The high-frequency auxiliary stage precisely regulates the output voltage, VOUT with a Ripple-Based Constant On-Time (RB-COT) control scheme, by utilizing the energy stored in the buffer capacitor, CAUX . With no stringent transient requirements on VAUX , the main stage is optimized to deliver the average load power, while the auxiliary stage is designed for high-frequency operation. A 50W, 48V-to-0.8V experimental prototype was built to validate the pro-posed architecture. Load transients from 5 A to 29 A were applied to the prototype, resulting in an output voltage deviation of 60 mV. The system achieves a peak efficiency of 89.5% with an output capacitance of only 720μF and an auxiliary capacitance of 120μF

M3 - Conference contribution

SN - 978-1-6654-8700-9

BT - 2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe)

PB - Institute of Electrical and Electronics Engineers

T2 - 24th European Conference on Power Electronics and Applications, EPE 2022 ECCE Europe

Y2 - 5 September 2022 through 9 September 2022

ER -

Khan N, Xu J, Villar-Piqué G, Pigott J, Bergveld HJ, El Sherif A et al. A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications. In 2022 24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe). Institute of Electrical and Electronics Engineers. 2022. 9907658

A Wide-Input-Voltage-Range 50W Series-Capacitor Buck Converter with Ancillary Voltage Bus for Fast Transient Response in 48V PoL Applications

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