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Due to the threshold voltage of diode switches, existing symmetrical voltage equalizers suffer from voltage drops across battery cells. To overcome this problem, this letter presents a novel voltage equalizer for series‐connected batteries. The proposed inductor‐less cross‐coupled topology allows the voltage of each battery cell to be balanced evenly without a threshold voltage drop, because no diode...
This paper proposes a novel switched-capacitor (SC) ac-ac converter using nested voltage equalizers. In the proposed ac-ac converter, a part of the capacitor voltage of a voltage equalizer is converted by other voltage equalizers. For this reason, the proposed ac-ac converter can achieve not only high step-up/step-down gain but also fewer circuit components than conventional SC ac-ac converters. Furthermore,...
In this paper, a comparative analysis on three types of switched capacitor DC-DC converter, which are SCVM (Switched capacitor Voltage Multiplier) type, series-parallel type and Fibonacci type, is performed in same modeling way. The way is four terminal equivalent circuit model. In this model, it is possible to derive power efficiency and relation between input and output. In order to do the analysis,...
UV-spectrophotometer is light absorbance measurement device. It is used to measure the solution for checking the concentration. However, it is very expensive. This is a problem for the chemical education which doesn't have this device enough for every student. It is not difficult to create the hand-made spectrophotometer. However, it is difficult to get the data same with the spectrophotometer. We...
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