A Current Mode Buck/Boost DC-DC Converter With Automatic Mode Transition and Light Load Efficiency Enhancement

Yanzhao MA; Shaoxi WANG; Shengbing ZHANG; Xiaoya FAN; Ran ZHENG

doi:10.1587/transele.E98.C.496

A Current Mode Buck/Boost DC-DC Converter With Automatic Mode Transition and Light Load Efficiency Enhancement

Yanzhao MA, Shaoxi WANG, Shengbing ZHANG, Xiaoya FAN, Ran ZHENG

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A current mode buck/boost DC-DC converter with automatic mode transition is presented in this paper. At heavy load, a control scheme adaptively changes operation mode between peak and valley current modes to achieve high efficiency, small output voltage ripple, and fast transient response. The switching loss is reduced by operating in pure modes, and the conduction loss is reduced by decreasing the average inductor current in transition modes. At light load, the equivalent switching frequency is decreased to reduce the switching loss. An automatic mode transition between heavy load PWM mode and light load PFM mode is achieved by introducing an average load current sensing method. The converter has been implemented with a standard 0.5 μm CMOS process. The output voltage ripple is less than 10 mV in all modes, and the peak efficiency is 95%.

Publication: IEICE TRANSACTIONS on Electronics Vol.E98-C No.6 pp.496-503

Publication Date: 2015/06/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E98.C.496

Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)

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Authors

Yanzhao MA
  Northwestern Polytechnical University
Shaoxi WANG
  Northwestern Polytechnical University
Shengbing ZHANG
  Northwestern Polytechnical University
Xiaoya FAN
  Northwestern Polytechnical University
Ran ZHENG
  Northwestern Polytechnical University

Keyword

automatic mode transition, buck/boost, current mode, high efficiency

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Yanzhao MA, Shaoxi WANG, Shengbing ZHANG, Xiaoya FAN, Ran ZHENG, "A Current Mode Buck/Boost DC-DC Converter With Automatic Mode Transition and Light Load Efficiency Enhancement" in IEICE TRANSACTIONS on Electronics, vol. E98-C, no. 6, pp. 496-503, June 2015, doi: 10.1587/transele.E98.C.496.
Abstract: A current mode buck/boost DC-DC converter with automatic mode transition is presented in this paper. At heavy load, a control scheme adaptively changes operation mode between peak and valley current modes to achieve high efficiency, small output voltage ripple, and fast transient response. The switching loss is reduced by operating in pure modes, and the conduction loss is reduced by decreasing the average inductor current in transition modes. At light load, the equivalent switching frequency is decreased to reduce the switching loss. An automatic mode transition between heavy load PWM mode and light load PFM mode is achieved by introducing an average load current sensing method. The converter has been implemented with a standard 0.5 μm CMOS process. The output voltage ripple is less than 10 mV in all modes, and the peak efficiency is 95%.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.496/_p

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@ARTICLE{e98-c_6_496,
author={Yanzhao MA, Shaoxi WANG, Shengbing ZHANG, Xiaoya FAN, Ran ZHENG, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Current Mode Buck/Boost DC-DC Converter With Automatic Mode Transition and Light Load Efficiency Enhancement},
year={2015},
volume={E98-C},
number={6},
pages={496-503},
abstract={A current mode buck/boost DC-DC converter with automatic mode transition is presented in this paper. At heavy load, a control scheme adaptively changes operation mode between peak and valley current modes to achieve high efficiency, small output voltage ripple, and fast transient response. The switching loss is reduced by operating in pure modes, and the conduction loss is reduced by decreasing the average inductor current in transition modes. At light load, the equivalent switching frequency is decreased to reduce the switching loss. An automatic mode transition between heavy load PWM mode and light load PFM mode is achieved by introducing an average load current sensing method. The converter has been implemented with a standard 0.5 μm CMOS process. The output voltage ripple is less than 10 mV in all modes, and the peak efficiency is 95%.},
keywords={},
doi={10.1587/transele.E98.C.496},
ISSN={1745-1353},
month={June},}

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TY - JOUR
TI - A Current Mode Buck/Boost DC-DC Converter With Automatic Mode Transition and Light Load Efficiency Enhancement
T2 - IEICE TRANSACTIONS on Electronics
SP - 496
EP - 503
AU - Yanzhao MA
AU - Shaoxi WANG
AU - Shengbing ZHANG
AU - Xiaoya FAN
AU - Ran ZHENG
PY - 2015
DO - 10.1587/transele.E98.C.496
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 2015
AB - A current mode buck/boost DC-DC converter with automatic mode transition is presented in this paper. At heavy load, a control scheme adaptively changes operation mode between peak and valley current modes to achieve high efficiency, small output voltage ripple, and fast transient response. The switching loss is reduced by operating in pure modes, and the conduction loss is reduced by decreasing the average inductor current in transition modes. At light load, the equivalent switching frequency is decreased to reduce the switching loss. An automatic mode transition between heavy load PWM mode and light load PFM mode is achieved by introducing an average load current sensing method. The converter has been implemented with a standard 0.5 μm CMOS process. The output voltage ripple is less than 10 mV in all modes, and the peak efficiency is 95%.
ER -