Yojiro Shibako

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This paper proposes a new single-phase inverter topology and describes the control method for the proposed inverter. The inverter consists of an energy buffer circuit, a dc–dc conversion circuit and an H-bridge circuit. The energy buffer circuit and H-bridge circuit enable the proposed inverter to output a multilevel voltage according to the proposed(More)
This paper presents a contactless power transfer system for automatic-guided vehicles (AGVs). The system can replace batteries and, therefore, can improve the operation ratio and load capacity of an AGV. The contactless power transformer in this system was designed to enhance the mutual inductance between the primary and secondary. The secondary involving a(More)
Contactless power transfer coils have a significantly large leakage inductance. Therefore, contactless power transfer systems require compensators to improve power factor. Although there are several types of the compensators, the LC series or parallel resonant compensators are commonly used for the simple structure. Generally, the resonant capacitors in the(More)
This paper proposes a photovoltaic (PV) inverter capable of stepping up voltage and the control algorithm for the inverter. The proposed inverter employs a charge-pump (CP) circuit instead of the commonly used step-up converter of a chopper type. Because the CP circuit does not include any inductor, the proposed inverter can be formed compactly. The CP(More)
This paper studies on a single-phase contactless power transfer system for automatic guided vehicles (AGVs). This system consists of transmitter lines placed on a floor and a receiver coil installed in AGVs. The design of the cables and lines is described. The several arrangement of ferrite bars for the receiver coil are compared to obtain maximum mutual(More)
This paper studies a three-phase contactless power transformer with a magnet yoke at a horizontal misalignment. The self-inductances and mutual inductances are simulated with three-dimensional finite element method and the characteristics of inductances are formulated as simple equations. Numerical simulation results confirm that the misalignment causes(More)
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