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In this paper, a passive pulsating ripple cancelling circuit (PPRCC) is proposed for eliminating the pulsating current ripple of power converters. Special features of the proposed PPRCC include simple, modular structure, and high degree of design flexibility. By integrating the proposed PPRCC, an input current ripple-free flyback-type converter is adopted and analyzed as an example because of its...
The cross-saturation inductance is a mutual inductance due to the saturation of portions of the magnetic circuit of one axis caused by the current of the other axis. In the sensorless drives, the differential cross-saturation inductance causes an error in the estimation of the rotor position when performed by means of the high frequency signal injection methods. The knowledge of the properties of...
To deal with the energy limitation of underwater gliders, based on existing wave energy converters at home and aboard, a pendulum-type ocean kinetic energy harvester was proposed for sensors energy supply on underwater gliders, which only consists of two conversion systems, and can directly transfer the ocean energy to the generator to improve the conversion efficiency. A prototype device was fabricated...
In this paper, a new common inductor current sharing method is proposed for multi-phase LLC resonant converter for high power application. Automatic current sharing is achieved by using a common resonant inductor for all the LLC resonant stages, by connecting the resonant inductors in each phase in parallel. The proposed method can automatically share the load current without any additional circuit...
The Fractional Slot Concentrated Winding (FSCW) configuration increases spatial harmonics of the magneto motive force (MMF) waveform of an electric machine. Therefore, saturation level in such machines is typically higher than that of the conventional machines with distributed windings. Since the characteristic of Interior Permanent Magnet (IPM) machine principally depends on inductances variation,...
Crossed dipole coils for the wide-range 3-D omnidirectional inductive power transfer (IPT) are proposed. Free positioning of a plane receiving (Rx) coil is obtained for an arbitrary direction within 1m from a plane transmission (Tx) coil. Both the Tx and Rx coils consist of crossed dipole coils with an orthogonal phase difference; hence, a rotating magnetic field is generated from the Tx, which enables...
This paper proposes a novel modulation method of the full bridge three-level LLC resonant converter. The voltage gain of the converter is analyzed by First Harmonic Approximation technique using this modulation method. Therefore designers can easily calculate the converter parameters. A 385V input, 225 to 378V/6.6kW output prototype converter shows 98.14% peak efficiency.
Axial flux magnetically geared machines offer the potential to achieve exceptional torque densities at high diameters. This work proposes a topology for an axial flux magnetically geared machine, in which the electric machine is placed in the bore of the axial flux magnetic gear. This new topology offers the advantage of correctly matching the size of the electric machine to its required torque without...
In the three-phase micro-inverter developed at the Florida Power Electronic Center (FPEC), maximum efficiency is achieved when it is operating at close to its rated power. At lower power, load independent loss becomes a larger part of the overall loss and negatively impacts efficiency. It is therefore advantageous to operate each phase as close to its rated power as possible. One way to accomplish...
Multi-coil links are generally introduced to improve the efficiency and extend the energy transmission distance. However, most of them are relay solutions which are equivalent to reduce the distance. In this paper, two kinds of 3-and three kinds of 4-coil links unchanging the energy transmission distance are proposed respectively. Among these links, by comparing the characteristics, the appropriate...
This paper presents the design and implementation of a 27.12 MHz, 320 W, 170 V to 28 V dc-dc resonant power converter with resonant inductors and capacitors embedded into the Printed Circuit Board (PCB). Operating at 27.12 MHz allows for small value and size resonant passive components to be implemented using traces on or within a PCB. Previous work [1]-[14] has demonstrated various ways of using...
Zero-Voltage Transition (ZVT) DC-DC converters with active snubber can be used in photovoltaic applications requiring high efficiency and high-frequency isolation transformer. In order to improve the dynamic response of ZVT converters, two different current control strategies, namely Feed Forward and Dead-Beat, are proposed. The Feed Forward and Dead-Beat control, both based on the converter electrical...
This paper presents a novel prototype of a timesharing frequency doubler principle-based current-fed zero current soft-switching (ZCS) high frequency resonant (HF-R) inverter for inductive power transfer (IPT) systems. The newly-proposed ZCS HF-R inverter is suitable for producing a higher frequency resonant current with switching power loss reduction by using a middle-class switching frequency insulated-gate-bipolar-power...
The introduction of 1200 V Silicon Carbide (SiC) based technologies has enabled the use of high performance LLC converters for high input voltage (>500 VDC) applications such as datacenter power conversion. In this paper, we describe performance of the magnetics for a 2 kW-level LLC converter, operating at 100 kHz with SiC devices. We present magnetics designed for high converter efficiencies (>...
This paper presents the design optimization and performance evaluation of an outer-rotor vernier machine with surface mounted permanent magnets. First the design specifications of the machine are described, then the design strategy and the optimization procedure are given in detail. A prototype based on the optimum design is manufactured and experimentally evaluated. The measured performances compare...
Losses are often a limiting factor for the application of bearingless motors, especially at high rotational speeds. In this paper the loss mechanisms in slotless bearingless disk drives with toroidal windings are identified and analyzed. Although the slotless topology already features comparably low losses, a detailed comprehensive analysis of the loss portion enables a further reduction of these...
This paper presents a practical investigation of the eddy current losses caused by 3D effects in a Motor Integrated Permanent Magnet Gear (MIPMG). Two prototypes of a MIPMG have been designed and build to be used as traction units for an electric vehicle. The measured efficiency of the prototype MIPMGs is superior in urban traffic when compared to state of the art direct drives, even though the measured...
This paper studies experimentally the benefits of silicon carbide based power semiconductor technology in a low-voltage grid connected three-phase three-wire pulse width modulated rectifier. The power semiconductor module used in the study is a custom-made 1.2-kV 100-A fully silicon carbide based half-bridge type module designed for fast switching speeds and high temperature operation. The experimental...
Transmitting and receiving resonators for 7 kW-class wireless power transfer/transmission (WPT) systems operating at 85 kHz have been developed for contactless Electric Vehicle (EV) / Plugin Hybrid EV (PHEV) charging. The light weight and small volume of the on-board receiving resonator to be mounted on the vehicle are required attributes. A thickness and a shape of the core in the resonance coil...
The modular multilevel converter (MMC), eliminating the expensive and bulky multi-winding phase-shifting transformer compared with the cascaded H-bridge converter, is shown to be of great potential in the field of medium-voltage motor drive applications. However, special care needs to be taken for MMC driving motor at low speeds, since the voltage fluctuation of the submodule capacitors increases...
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