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A PWM/PFM Dual-Mode DC-DC Buck Converter with Load-Dependent Efficiency-Controllable Scheme for Multi-Purpose IoT Applications

Author

Listed:
  • Myeong Woo Kim

    (Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea)

  • Jae Joon Kim

    (Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea)

Abstract

This paper presents a dual-mode DC-DC buck converter including a load-dependent, efficiency-controllable scheme to support multi-purpose IoT applications. For light-load applications, a selectable adaptive on-time pulse frequency modulation (PFM) control is proposed to achieve optimum power efficiency by selecting the optimum switching frequency according to the load current, thereby reducing unnecessary switching losses. When the inductor peak current value or converter output voltage ripple are considered in some applications, its on-time can be adjusted further. In heavy-load applications, a conventional pulse width modulation (PWM) control scheme is adopted, and its gate driver is structured to reduce dynamic current, preventing the current from shooting through the power switch. A proposed dual-mode buck converter prototype is fabricated in a 180 nm CMOS process, achieving its measured maximum efficiency of 95.7% and power density of 0.83 W/mm 2 .

Suggested Citation

  • Myeong Woo Kim & Jae Joon Kim, 2021. "A PWM/PFM Dual-Mode DC-DC Buck Converter with Load-Dependent Efficiency-Controllable Scheme for Multi-Purpose IoT Applications," Energies, MDPI, vol. 14(4), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:960-:d:497900
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    References listed on IDEAS

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    1. Truong Thi Kim Nga & Seong-Mun Park & Young-Jun Park & Sang-Hyuk Park & SangYun Kim & Truong Van Cong Thuong & Minjae Lee & Keum Cheol Hwang & Youngoo Yang & Kang-Yoon Lee, 2018. "A Wide Input Range Buck-Boost DC–DC Converter Using Hysteresis Triple-Mode Control Technique with Peak Efficiency of 94.8% for RF Energy Harvesting Applications," Energies, MDPI, vol. 11(7), pages 1-13, June.
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    Cited by:

    1. Hsiao-Hsing Chou & Hsin-Liang Chen, 2021. "A Novel Buck Converter with Constant Frequency Controlled Technique," Energies, MDPI, vol. 14(18), pages 1-19, September.
    2. Anna Richelli, 2021. "Current Research on Embedded DC/DC Converters," Energies, MDPI, vol. 14(19), pages 1-2, September.
    3. Amjad, Muhammad & Farooq-i-Azam, Muhammad & Ni, Qiang & Dong, Mianxiong & Ansari, Ejaz Ahmad, 2022. "Wireless charging systems for electric vehicles," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).

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