Browsing by Author "Fan, Philex Ming-Yan"

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An 83.4% Peak Efficiency Single-Inductor Multiple-Output Based Adaptive Gate Biasing DC-DC Converter for Thermoelectric Energy Harvesting
(2015-02-01)
Chen, Po-Hung
;
Fan, Philex Ming-Yan
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電子工程學系及電子研究所
;
生醫電子轉譯研究中心
;
Department of Electronics Engineering and Institute of Electronics
This paper presents a 100 mV input, 500 mV output single-inductor multiple-output (SIMO) based step-up dc-dc converter with adaptive gate biasing (AGB) technique implemented in 0.18 mu m CMOS technology for thermoelectric energy harvesting. The proposed AGB technique and near-threshold voltage (near-V-TH) energy redistribution control (ERC) ensure high conversion efficiency over a wide range of load currents. The proposed method automatically reduces conduction and switching losses of power MOSFETs without the need for auxiliary power converters or additional off-chip inductors. The AGB technique reduces conduction and switching losses under heavy-load and light-load conditions, respectively. The experimental results show that the efficiency of the proposed converter is enhanced by 25.5% and 18% at output load currents of 1500 mu A and 50 mu A, respectively. The proposed step-up dc-dc converter achieves the lowest output voltage and provides the highest conversion efficiency of 83.4% to date in standard CMOS process for thermoelectric energy harvesting.
Energy Harvesting Techniques: Energy Sources, Power Management and Conversion
(2015)
Fan, Philex Ming-Yan
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Wong, Oi-Ying
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Chung, Ming-Jie
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Su, Tze-Yun
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Zhang, Xin
Energy harvesting techniques have been developed more than a decade and received much attention in realizing long-term energy autonomous microsystems. Many converter topologies and circuit techniques have been reported to effectively convert the harvested energy to usable outputs. In this paper, major green energy sources as well as the equivalent circuits are reviewed. In addition, maximum power point tracking (MPPT) technique and power conversion topologies are also included.
Thermoelectric Energy Harvesting Interface Circuit With Capacitive Bootstrapping Technique for Energy-Efficient IoT Devices
(2018-10-01)
Chen, Po-Hung
;
Su, Tze-Yun
;
Fan, Philex Ming-Yan
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper presents a low-input-voltage (100 mV), low-output-voltage (500-600 mV) thermoelectric energy harvesting interface circuit for near-threshold energy-efficient Internet-of-Things (IoT) devices. The capacitive bootstrapping technique is used to generate a positive and negative bias pair for alleviating the significant conduction losses of power MOSFETs in a near-threshold operation. Internal bias voltages are automatically boosted to different levels as per the loading conditions to extend the output power range. The deployment of constant on-time digital pulse skip modulation with digital zero current detection (ZCD) achieves an ultralight load operation, and precluding a reverse current. The digital ZCD is capable of dynamically adjusting the off-time (TOFF) of the power transistors, which vary according to the input and output voltage levels. The proposed step-up dc-dc power converter implemented using a 180 nm CMOS technology demonstrates a maximum conversion efficiency of 76.4% over a 1 mu W-500 mu W load range, significantly evaluating the feasibility of the near-threshold interface circuit architecture for energy-efficient IoT devices.