A Five‐Element Multiplex Resonant Full‐Bridge DC‐DC Converter with a Variable Inductive Reactance

A five‐element multiplex resonant (LLCLC) full‐bridge DC‐DC converter controlled by pulse frequency modulation (PFM) is proposed in this paper. The high frequency (HF)‐link resonant DC‐DC converter proposed herein can perform wide‐range output power and voltage regulation with a narrow frequency range due to an antiresonant tank that works effectively as a wide‐range variable inductor. The advantageous characteristics of the antiresonant tank provide overcurrent protection in the case of the short‐circuited load condition as well as in the startup interval. Thus, the technical challenges of a conventional LLC DC‐DC converter can be overcome, and the reliability of the relevant switch‐mode power supplies can be improved. The operating principle of the LLCLC DC‐DC converter is described, after which its performance is evaluated in an experimental setup based on the 2.5 kW prototype. Finally, the feasibility of the proposed DC‐DC converter is discussed from a practical point of view.     

Analysis of Measured Data in Unbalanced Distribution System and Method of Making of Distribution System Model for Analyzing

In recent years, rapid introduction of photovoltaic power systems (PVs) causes voltage rise in distribution systems. In addition, residential PVs cause voltage unbalance in distribution systems. For these reasons, it has become difficult to control voltage in distribution systems to within the allowable range. Therefore, it is necessary to consider the voltage unbalance suppression method corresponding to the measured data in unbalanced distribution systems. Thus, we measured voltage on the distribution lines that are expected to large voltage imbalance and analyzed the reality of voltage unbalance. Also, static VAR compensator is suitable for voltage unbalance suppression, although it is expensive. Therefore, we make the distribution system model using the measured voltage in distribution systems to verify the voltage unbalance suppression effect.     

Clear imaging of Förster resonance energy transfer (FRET) signals of Ras activation by a time-lapse three-dimensional deconvolution system

A procedure for a time series of three‐dimensional Förster resonance energy transfer observation of a cell has been established. It employs quantitative deconvolution and three‐dimensional views of intensity‐modulated displays. The development was done with Raichu, a synthetic Ras protein capable of producing Förster resonance energy transfer upon its activation, for which two‐dimensional imaging has been established. This method gave much clearer images of Förster resonance energy transfer than does the usual method without deconvolution, even though the signals were relatively weak. The results suggest that this procedure is compatible with weak fluorescent light, which is prone to photobleaching.