Browsing by Author "Muniandi, Balakumar"

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A 97% Maximum Efficiency Fully Automated Control Turbo Boost Topology for Battery Chargers
(2019-11-01)
Muniandi, Balakumar
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Huang, Chao-Jen
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Kuo, Chun-Chieh
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Yang, Te-Fu
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Chen, Ke-Horng
In this paper, the proposed topology of a fully automated control (FAC) battery charger that provides turbo-boost operation and fully automated detection without any feedback from the system is discussed. It uses closed-loop control for automatic system load detection and automatically adjusts the battery discharge current. The advantages include shortened battery discharge time and maximum power provided by the adapter. Therefore, the FAC technique is flexible for any load system that is limited to battery chargers with the turbo boost mode support. In addition, to avoid over discharge, a battery protection circuitry is also included. The test chip is fabricated using a 0.25- $\mu \text{m}$ CMOS process, with a maximum efficiency of 94.58 & x0025; when the charger operates in the turbo boost mode, and achieves 97 & x0025; maximum efficiency when the charger operates in buck charge mode.
A High Efficiency and Fast Transient Digital Low-Dropout Regulator With the Burst Mode Corresponding to the Power-Saving Modes of DC-DC Switching Converters
(2020-04-01)
Lin, Jian-He
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Yang, Shang-Hsien
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Muniandi, Balakumar
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Ma, Yu-Sheng
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Huang, Chia-Ming
The proposed digital low-dropout regulator uses nonlinear switching control (NLSC) technique to suppress voltage ripple to less than 6mV when the switching noise voltage of a switching regulator operating in a power-saving mode is greater than 50mV. In addition, the NLSC technique improves the current efficiency by reducing the quiescent current to less than 10 A and reduces the switching power loss through variable switching frequency control. With a load step of 1-20mA, the transient response time is 1.3 s and the peak current efficiency is 99.8 at heavy loads.