Browsing by Author "Chen, Ke-Homg"

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A 99.2% Tracking Accuracy Single-Inductor Quadruple-Input-Quadruple-Output Buck-Boost Converter Topology with Periodical Interval Perturbation and Observation MPPT
(2018-01-01)
Huang, Chao-Jen
;
Ma, Yao-Sheng
;
Yang, Wen-Hau
;
Lin, Yen-Ting
;
Kuo, Chun-Chieh
this paper provides a Single-Inductor Quadruple-Input--Quadruple-Output buck-boost converter to achieve maximum tracking efficiency of 99,2% due to continuous supply in one cycle. The Maximum Power Point (MPP) tracking mode and the Harvest Energy Delivering (RED) mode harvest each energy harvesting source, deliver energy to the battery and supply it to the loading system in one cycle. Each output voltage ranges from 600mV to 2.5V and the maximum output power is up to 60mW. The peak efficiency is 91.2%.
Current Feedback Compensation (CFC) Technique for Adaptively Adjusting the Phase Margin in Capacitor-Free LDO Regulators
(2008-01-01)
Yang, Huan-Chien
;
Huang, Han-Hsiang
;
Chen, Chi-Lin
;
Huang, Ming-Hsin
;
Chen, Ke-Homg
Current feedback compensation technique (CFC) can adaptively adjust the phase margin for achieving better transient response than that with variant phase margin at different load current conditions. Not only fast transient response is attained due to suitable phase margin but also the minimum load current limitation can be greatly reduced to about 50 mu A without sacrificing bandwidth at tight load current condition. Besides, CFC technique can have high PSRR bandwidth with compatible compensation capacitors compared to the Q-reduction technique [6]. The capacitor-free LDO regulator with CFC technique is fabricated by TSMC 0.35 mu m 2P4M CMOS process with small compensation capacitors 5pF and 1.5pF. Experimental results demonstrate that the minimum load can be reduced to 50 mu A and transient response time with adaptively phase margin control is smaller than 1 mu s.
Current Feedback Compensation (CFC) Technique for Adaptively Adjusting the Phase Margin in Capacitor-Free LDO Regulators
(2008-01-01)
Yang, Huan-Chien
;
Huang, Han-Hsiang
;
Chen, Chi-Lin
;
Huang, Ming-Hsin
;
Chen, Ke-Homg
Current feedback compensation technique (CFC) can adaptively adjust the phase margin for achieving better transient response than that with variant phase margin at different load current conditions. Not only fast transient response is attained due to suitable phase margin but also the minimum load current limitation can be greatly reduced to about 50 mu A without sacrificing bandwidth at tight load current condition. Besides, CFC technique can have high PSRR bandwidth with compatible compensation capacitors compared to the Q-reduction technique [6]. The capacitor-free LDO regulator with CFC technique is fabricated by TSMC 0.35 mu m 2P4M CMOS process with small compensation capacitors 5pF and 1.5pF. Experimental results demonstrate that the minimum load can be reduced to 50 mu A and transient response time with adaptively phase margin control is smaller than 1 mu s.
High Efficiency and Smooth Transition Buck-Boost Converter for Extending Battery Life in Portable Devices
(2009)
Huang, Ping-Ching
;
Wu, Wei-Quan
;
Ho, Hsin-Hsin
;
Chen, Ke-Homg
;
電控工程研究所
This paper presents a high-efficiency and smooth-transition buck-boost (BB) converter to extend the battery life of portable devices. Owing to the usage of four switches, the BB control topology needs to minimize the switching and conduction losses at the same time. Therefore, over a wide input voltage range, the proposed BB converter consumes minimum switching loss like the basic operation of buck or boost converter. Besides, the conduction loss is reduced by means of the reduction of the inductor current level. Especially, the proposed BB converter offers good line/load regulation and thus provides a smooth and stable output voltage when the battery voltage decreases. Simulation results show that the output voltage drops is very small during the whole battery life time and the output transition is very smooth during the mode transition by the proposed BB control scheme.