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A typical low power IPT system employs an H-Bridge converter with a simple control strategy to generate a high frequency current from DC power supply. This paper proposes a cascaded multilevel converter for bidirectional IPT (BIPT) systems, which is suitable for low to medium power applications as well as for situations such as PV cells where several individual DC sources are to be utilized. A novel...
Today's PV micro-inverters (MIVs) provide a modular solution for generation, however the energy storage architectures remain centralized, requiring an additional bi-directional ac-dc converter, with complex cell balancing circuits. Distributing storage capacity within the smart PV panels allows power fluctuations to be locally buffered, while minimizing the need for additional power electronics and...
Inductive power transfer (IPT) systems are resonant converters whose output characteristics are mostly load dependent. Conditions for ensuring a load-independent voltage-transfer ratio of an IPT system have been studied. However, load-independent current output can be more desirable for applications such as battery charging and LED driving. This paper studies the characteristics of IPT systems operating...
Volume and weight of the propulsion equipment of a traction drive are most important features to provide more efficient transportation in the future. It will be shown how the converter technology for traction drives has improved its performance in the past decades and new developments are presented promising a further increase in power density. The machine and corresponding gear and suspension system...
Recently, the use of permanent magnet (PM) motors has expanded remarkably as a result of improvements in the performance of the rare-earth PM motor. However, it is desirable to reduce the use of rare-earth materials, which are an important aspect of the high-performance PM motor, because of the high cost and the unpredictability involved in procuring such materials. The performance of motors that...
A Switched Reluctance Motor (SRM) has been designed with outer dimensions, maximum torque, operating area, and maximum efficiency identical to the rare-earth PM motor used in the Toyota Prius. However, an SRM has salient poles in the rotor; thus, additional windage loss is generated. In this paper, estimation of the windage loss of the SRM is carried out. Then, a comparison to the machine test result...
The efficiency of a contactless power transformer is determined by the output load. We propose a high-efficiency contactless power transfer system for a low-voltage and large-current load. The proposed system is composed of a contactless power transfer system with series and series resonant capacitors and a current-doubler rectifier circuit. This paper presents the characteristic of the proposed system...
In this presentation the development of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) will be presented. The molded core shows low iron loss compared to the iron loss of machined core. Iron loss of machined core is large because of the heat at the machining of bulk SMC. Moreover, by using SMC, 3D shaped core is easily constructed. The teeth of the stator core...
As the number of data centers has grown in pace with the burgeoning expansion in information technology (IT), reducing the power consumption of data centers has become an important social challenge. IT equipment is a primary contributor to data center power consumption and, as such, is an area where power conservation is indispensable. Nevertheless, while the efficiency of the power supply modules...
This paper proposes a new sensorless vector control method for energy-efficient and wide-speed-range drives of permanent-magnet synchronous motors. The proposed sensorless method is endowed with all of the following functions: 1) wide-speed-range drive under voltage limit, 2) current limitation, 3) high-efficiency. These functions are realized in a very simple manner and can operate adaptively in...
In this paper, a LED dimming circuit, together with the KY converter, is presented, which is controlled based on the field-programmable gate array (FPGA). By a given dimming command and the proposed maximum gate voltage detector, the voltage across the MOSFET in the linear current regulator can be reduced so as to upgrade the efficiency of the overall system. Aside from this, each LED string takes...
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