Koji Toyama

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Featured researches published by Koji Toyama.

international conference on industrial electronics control and instrumentation | 2000

Koji Toyama; H. Ohtake; Satoshi Matsuda; Shinchi Kobayashi; Masayuki Morimoto; Hidehiko Sugimoto

Repetitive control is installed into the current control of the residential photovoltaic power generation system. The generation system is interconnected to the utility grid. The control command and disturbance of the inverter is a periodic line frequency value. The control stability and suppression of the disturbance are realized by the repetitive control of the current signal. The control is implemented into a single-chip microcomputer by the software. 18 kHz control of the current realizes low distortion output and enables us to use smaller power inductor of the filter.

Progress in Electromagnetics Research Letters | 2011

Zihong Huang; Wenhua Chen; Zhenghe Feng; Kazunori Teshima; Koji Toyama

In this paper, a low cost measurement system with high accuracy for radiated emission evaluation has been proposed. By combining the test data of the current probe at difierent positions on the harness, the measurement accuracy is improved compared with conventional single probe method. For the sake of high accuracy, a transfer function is built to map the relationship between anechoic chamber method and current probe method. Based on experiments for evaluation, the flnal estimation of radiated emission agrees well with the measured results in anechoic chamber. For the cases tested, the difierence between the current probe method and the anechoic chamber method is less than 3dB.

international conference on microwave and millimeter wave technology | 2010

Zihong Huang; Wenhua Chen; Zhenghe Feng; Koji Toyama; Kazunori Teshima

A novel low cost radiated emission measurement system by using current probe has been proposed in this paper. Compared with conventional anechoic chamber measurement method, this new method could reduce test cost and save developing time efficiently. In order to improve the accuracy, a transfer function has been built for mapping the relationship between current probe method and anechoic chamber method. By using the interpolation, the final estimated radiation emission has been validated and agreed well with the experimental results in anechoic chamber.

Archive | 2008