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We constructed a charge and discharge system for effective utilization of an electric storage device composed of batteries. We verified the system operation by simulation analysis and actual measurement. The simulation analysis showed that it is useful to alternately use two secondary batteries as the lithium ion battery (LIB). From the measurement of 60 cycles, the use of secondary batteries under...
In this study, we demonstrated an isolated-type flyback converter circuit for high-frequency operations. We estimated the high-frequency characteristics of passive devices in various conditions of a DC-DC converter circuit. We experimentally developed the isolated-type flyback converter circuit and evaluated the frequency response properties. In order to verify the fast-switching operation, the input...
In this study, the temperature characteristics of a one-stage and a two-stage structure of Peltier devices were measured. We identified that the two-stage structure was able to suppress the temperature rise at the endothermic end. A temperature difference was established based on the charge transfer in semiconductors, with respect to both Joule heating and thermal conductivity.
We have developed a scanning-probe microscope (SPM) that combines atomic-force microscopy (AFM) with both Kelvin-probe force microscopy (KFM — to measure the surface potential). Surface physical characteristics of a commercial Si Schottky barrier diode (Si-SBD), with and without an applied reverse bias, were measured over the same area by the AFM/KFM system. We thus investigated that influence of...
We have developed an insulation-type flyback converter circuit for high-frequency operation. We estimated the high frequency characteristics of passive devices in various areas of the DC-DC converter circuit. We produced a flyback transformer experimentally and evaluated the frequency response properties. In order to verify the fast switching operation, the input and output voltages and currents of...
Spatiotemporal variations of carrier density and potential in silicon-Schottky barrier diode (Si-SBD) have been simulated using a self-consistent spatially two-dimensional fluid model, based on the continuity equation and the Poisson equation. The validity of the fluid model, developed in this work, was shown because simulated surface-potential mapping was qualitatively good agreement with experimental...
In this study, we measured the frequency characteristics of three types of piezoelectric film in piezo-buzzer devices of different sizes. We compared the experimental and theoretical values of its resonant frequency, and investigated the size and thickness of the piezoelectric device that would be best suited to floor power generation. From these results, it was concluded that the piezoelectric devices...
We investigated both the surface roughness and the surface potential of organic semiconductors deposited by two different film deposition methods via atomic force microscopy (AFM) and Kelvin probe force microscopy (KFM). We fabricated samples that imitated a part of an organic light emitting diode (OLED) structure by depositing bis [N, N'-(l-naphthy)-N, N'-phenyl] benzidine (α-NPD) on indium-tin-oxide...
This paper discusses the development of 5-watts-class flyback converter which can operate at switching frequencies from 1 to 16 MHz. In order to analyze fast switching operations, the input and output voltages with currents are measured for estimating the converter. The self-induced soft switching operation is experimentally investigated at a ringing frequency caused by parasitic components, including...
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