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This paper proposes an improved cell balancing circuit for fast equalization among the lithium ion (Li-ion) batteries. Usually, the battery cell balancing circuit uses the sensor to estimate the accurate SOC (state of charge) of each battery cell and to operate the switch selectively [1], but it makes the system bulky and expensive. A simple voltage sensorless charge balancing circuit has been proposed...
UPS provides emergency power when utility power is not available, so the reliability of UPS is more important than inverter drive systems. In this paper, a fault diagnosis system for UPS is proposed using FFT frequency analysis of output current of inverter side of UPS under linear and nonlinear load conditions. Software PLL for precise synchronization of one period sampling and double buffer memory...
Hydroxy fatty acids are considered as important value-added product for industrial application because of their special properties such as higher viscosity and reactivity. Microbial production of the hydroxy fatty acids from various fatty acid substrates have been actively studied using several microorganisms. The new bacterial isolate Pseudomonas aeruginosa (PR3) had been reported to produce mono-,...
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