48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3&#x0025; Efficiency in Automotive Applications

Si Yi Li; Bo Ruen Chen; Ke Horng Chen; Ying Hsi Lin; Shian Ru Lin; Tsung Yen Tsai

doi:10.1109/JSSC.2022.3170882

48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications

Si Yi Li, Bo Ruen Chen, Ke Horng Chen, Ying Hsi Lin, Shian Ru Lin, Tsung Yen Tsai

Department of Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

This article presents a one-stage buck converter with an accurate nanosecond ON-time ( <formula> <tex>${T_{ON}}$</tex> </formula> ) control for 48-1-V direct conversion for automotive applications. In order to overcome the low duty cycle from 48 to 1 V, the proposed high-voltage storage and low-voltage boost (HSLB) bootstrap circuit can reduce the level shifter delay to close to zero and the bootstrap delay to less than 2 ns. In addition, the early comparison <formula> <tex>${T_{ON}}$</tex> </formula> generator can reduce the comparator delay ( <formula> <tex>$${T_{d_{ comp}}}$$</tex> </formula> ) to close to zero at steady state to achieve precise nanosecond pulse <formula> <tex>${T_{ON}}$</tex> </formula> . On the other hand, <formula> <tex>${T_{d_{ comp}}}$</tex> </formula> can be quickly extended to increase <formula> <tex>${T_{ON}}$</tex> </formula> by 540% to achieve fast transient with the recovery time of 3 μs, in case load changes from 200 mA to 1 A. Based on the precise nanosecond <formula> <tex>${T_{ON}}$</tex> </formula> , the OFF-time is extended by the load-dependent current limiting OFF-time modulation for improving light-load efficiency. Experimental results show that the peak efficiency reaches 96.5%, 95.1%, and 92.8% when <formula> <tex>${V_{{IN}} }$</tex> </formula> is 12, 24, and 48 V, respectively, for <formula> <tex>${V_{{OUT} }$</tex> </formula> = 1 V.

Original language	English
Pages (from-to)	1
Number of pages	1
Journal	IEEE Journal of Solid-State Circuits
DOIs	https://doi.org/10.1109/JSSC.2022.3170882
State	Accepted/In press - 2022

Keywords

48-1-V direct conversion
Automotive applications
automotive applications
buck converter
Buck converters
Capacitors
Delays
high step-down ratio
low total loop delay
Low voltage
seamless transition.
Switches
Voltage

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Li, S. Y., Chen, B. R., Chen, K. H., Lin, Y. H., Lin, S. R., & Tsai, T. Y. (Accepted/In press). 48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications. IEEE Journal of Solid-State Circuits, 1. https://doi.org/10.1109/JSSC.2022.3170882

@article{17fab4dee23b416180a80f3a6fdba69a,

title = "48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications",

abstract = "This article presents a one-stage buck converter with an accurate nanosecond ON-time ( ${T_{ON}}$ ) control for 48-1-V direct conversion for automotive applications. In order to overcome the low duty cycle from 48 to 1 V, the proposed high-voltage storage and low-voltage boost (HSLB) bootstrap circuit can reduce the level shifter delay to close to zero and the bootstrap delay to less than 2 ns. In addition, the early comparison ${T_{ON}}$ generator can reduce the comparator delay ( $${T_{d_{ comp}}}$$ ) to close to zero at steady state to achieve precise nanosecond pulse ${T_{ON}}$ . On the other hand, ${T_{d_{ comp}}}$ can be quickly extended to increase ${T_{ON}}$ by 540% to achieve fast transient with the recovery time of 3 μs, in case load changes from 200 mA to 1 A. Based on the precise nanosecond ${T_{ON}}$ , the OFF-time is extended by the load-dependent current limiting OFF-time modulation for improving light-load efficiency. Experimental results show that the peak efficiency reaches 96.5%, 95.1%, and 92.8% when ${V_{{IN}} }$ is 12, 24, and 48 V, respectively, for ${V_{{OUT} }$ = 1 V.",

keywords = "48-1-V direct conversion, Automotive applications, automotive applications, buck converter, Buck converters, Capacitors, Delays, high step-down ratio, low total loop delay, Low voltage, seamless transition., Switches, Voltage",

author = "Li, {Si Yi} and Chen, {Bo Ruen} and Chen, {Ke Horng} and Lin, {Ying Hsi} and Lin, {Shian Ru} and Tsai, {Tsung Yen}",

note = "Publisher Copyright: IEEE",

year = "2022",

doi = "10.1109/JSSC.2022.3170882",

language = "English",

pages = "1",

journal = "IEEE Journal of Solid-State Circuits",

issn = "0018-9200",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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Li, SY, Chen, BR, Chen, KH, Lin, YH, Lin, SR & Tsai, TY 2022, '48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications', IEEE Journal of Solid-State Circuits, pp. 1. https://doi.org/10.1109/JSSC.2022.3170882

48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications. / Li, Si Yi; Chen, Bo Ruen; Chen, Ke Horng et al.
In: IEEE Journal of Solid-State Circuits, 2022, p. 1.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - 48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications

AU - Li, Si Yi

AU - Chen, Bo Ruen

AU - Chen, Ke Horng

AU - Lin, Ying Hsi

AU - Lin, Shian Ru

AU - Tsai, Tsung Yen

N1 - Publisher Copyright: IEEE

PY - 2022

Y1 - 2022

N2 - This article presents a one-stage buck converter with an accurate nanosecond ON-time ( ${T_{ON}}$ ) control for 48-1-V direct conversion for automotive applications. In order to overcome the low duty cycle from 48 to 1 V, the proposed high-voltage storage and low-voltage boost (HSLB) bootstrap circuit can reduce the level shifter delay to close to zero and the bootstrap delay to less than 2 ns. In addition, the early comparison ${T_{ON}}$ generator can reduce the comparator delay ( $${T_{d_{ comp}}}$$ ) to close to zero at steady state to achieve precise nanosecond pulse ${T_{ON}}$ . On the other hand, ${T_{d_{ comp}}}$ can be quickly extended to increase ${T_{ON}}$ by 540% to achieve fast transient with the recovery time of 3 μs, in case load changes from 200 mA to 1 A. Based on the precise nanosecond ${T_{ON}}$ , the OFF-time is extended by the load-dependent current limiting OFF-time modulation for improving light-load efficiency. Experimental results show that the peak efficiency reaches 96.5%, 95.1%, and 92.8% when ${V_{{IN}} }$ is 12, 24, and 48 V, respectively, for ${V_{{OUT} }$ = 1 V.

AB - This article presents a one-stage buck converter with an accurate nanosecond ON-time ( ${T_{ON}}$ ) control for 48-1-V direct conversion for automotive applications. In order to overcome the low duty cycle from 48 to 1 V, the proposed high-voltage storage and low-voltage boost (HSLB) bootstrap circuit can reduce the level shifter delay to close to zero and the bootstrap delay to less than 2 ns. In addition, the early comparison ${T_{ON}}$ generator can reduce the comparator delay ( $${T_{d_{ comp}}}$$ ) to close to zero at steady state to achieve precise nanosecond pulse ${T_{ON}}$ . On the other hand, ${T_{d_{ comp}}}$ can be quickly extended to increase ${T_{ON}}$ by 540% to achieve fast transient with the recovery time of 3 μs, in case load changes from 200 mA to 1 A. Based on the precise nanosecond ${T_{ON}}$ , the OFF-time is extended by the load-dependent current limiting OFF-time modulation for improving light-load efficiency. Experimental results show that the peak efficiency reaches 96.5%, 95.1%, and 92.8% when ${V_{{IN}} }$ is 12, 24, and 48 V, respectively, for ${V_{{OUT} }$ = 1 V.

KW - 48-1-V direct conversion

KW - Automotive applications

KW - automotive applications

KW - buck converter

KW - Buck converters

KW - Capacitors

KW - Delays

KW - high step-down ratio

KW - low total loop delay

KW - Low voltage

KW - seamless transition.

KW - Switches

KW - Voltage

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U2 - 10.1109/JSSC.2022.3170882

DO - 10.1109/JSSC.2022.3170882

M3 - Article

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SN - 0018-9200

SP - 1

JO - IEEE Journal of Solid-State Circuits

JF - IEEE Journal of Solid-State Circuits

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