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- 저자 : H. Funato (검색결과 3 건)
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T. Kitabayashi,H. Funato,J. Haruna,Y. Tsuruta,K. Yamaichi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The authors have proposed a new capacitive power transfer (CPT) system using one-pulse switching active capacitor (OPSAC). The proposed system improves transfer power without LC resonance so that it is robust against parameter change. The one of advantages of OPSAC is easy realization of cascade connection in order to enhance transfer power. In the past, CPT system with five-stage OPSAC was successfully realized, but the actual transfer power was smaller than theoretical power. In this paper, loss factor is analyzed using precise calculation model. In addition, from the results of loss analysis, it was clarified that the one of the main loss factor is diodes of rectifier so that the system using synchronous rectifier is also proposed for power improvement.
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T. Mori,T.Igarashi,H. Funato,S. Ogasawara,M. Hara,F.Okazaki,Y. Hirota 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Recently, high performance power switching device realize high performance power converter. However, high speed turn-on and turn-off cause electromagnetic interference (EMI). EMI filters or wire shields decrease EMI. However, they take over space of automotive, and cost is expense. Authors have proposed a new method to decrease high-frequency noise at specific frequency band with modification of switching transient slope. In order to realize a step-down converter with modified switching slope, there are several problems such as generating PWM signal with modified slope, feasibility in a real chopper circuit, switching loss and so on. In this paper, a step-down converter applied proposed modified switching slope was successfully realized using MT (Modified Transient)-PWM generator. The operational characteristics were analyzed for resistive load.
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P. Bartal,J. Hamar,I. Nagy,H. Funato,Y. Nishida 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Today’s society is more energy-hungry than ever. Despite the progress made both on research and technological level and the wide acceptance of energy efficient and “green” technologies and innovations, the global energy consumption figures are on the rise. It is not sufficient to have efficient consumers, the various conversion stages along the distribution network have to be highly efficient too, in order to minimize losses. Another problem in the way of optimum efficiency is the wide range of voltages required by the actual loads. The paper proposes a way for improving the efficiency in the DC/DC converter field by selecting automatically the number of turned on or off converters supplying the current consumer just connected to the DC bus. Several DC/DC converters equipped with intelligence are connected in parallel to the DC bus and only the number of converters required to ensure optimum efficiency will be in operation at a given time. This is possible due to the intelligent agent based digital control implemented into the microcontroller driving the converters. The decisions leading to optimal operation will be taken by the communicating agents through negotiations. Furthermore, the converters will be able to gather information on the load they serve. This will make it possible to determine the voltage level and current requirements of the load, adjusting the operation of the converter(s) to it. After simulation a demonstration unit has been built in the lab, using four converters connected in parallel. Results from simulation and laboratory measurements are presented.
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