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This paper compares the characteristics of serial, parallel and LCC compensation topologies of secondary-side in wireless powering systems with a constant-current primary-side. The topologies characteristics of power, efficiency and load are carefully analyzed and detailed presented. And the correctness of theoretical analysis is verified by simulations. This study results can guide the selection...
This paper proposes a secondary side hysteretic Pulse Width Modulation (PWM) control technique that employs a switch and hysteresis comparator to realize constant current charging for the variable load. The switch parallels with the secondary side rectifier and is controlled by the hysteretic PWM signals. Two working modes, named as short circuit mode and rectify mode, are used to adjust the power...
This paper presents a design procedure of a Class E2 DC-DC converter for megahertz wireless power transfer. The design formulas are analytically derived based on the input impedance of the Class E rectifier. A 6.78 MHz Class E2 DC-DC converter is designed and implemented by means of those formulas. The power-level of the converter is 15W. The experiments are provided to verify the proposed design...
Due to the rising electrification, there is a need for innovative charging technologies to keep pace with technological progress and tethered charging. The electrical performance of wireless power transfer (WPT) systems is one crucial point in charging electric vehicles. The resonance frequency respectively the switching frequency of the converter has a large impact on system behavior. Due to component...
Misalignment between the transmitter coil and the receiver coil would in some cases lead to significant power and efficiency decline in a wireless power transfer system. This paper implements the LCC compensation topology to improve the horizontal misalignment tolerance under a certain load condition. The reason for the efficiency decline under misalignment is firstly analyzed based on the equivalent...
This article proposes the design and implementation of the class E power amplifier with parallel circuit for wireless power transfer systems. The high power efficiency of the class E power amplifier with parallel circuit provides small circuit by reducing cooling systems and using low inductance of a DC-feed inductor. Furthermore, the parallel circuit provides wideband operating frequency that makes...
For the application of on-board energy storage equipment of rail transit vehicle, the bi-directional DC/DC is the significant converter. Considering the converter and super-capacitor load, the paper proposes a wireless charging circuit topology for the light rail transit. And a dual side control strategy is proposed to not only meet the requirements of the system energy output, but also maintain the...
The secondary coil installed on an EV is required to be small in size, light in weight, and efficient in power transfer, as well as tolerant in lateral misalignment with a large air gap. Also, a wireless power transfer (WPT) system needs high power transfer. Both downsizing and high power transfer bring a thermal problem the secondary coil. This paper proposes a WPT system combining the so-called...
A wireless power transfer system can increase its system frequency to several Megahertz for large spatial freedom. A MHz system usually uses the same compensation as those kHz systems. Traditionally, the rectifier is modeled as a pure resistive load for the coupling coils when designing the compensation capacitors. However, the rectifier input reactance cannot be ignored for MHz systems. This reactance...
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...
Two current driven half wave rectifier topologies, Class-D and -E, have been characterised for IPT applications. Both rectifiers utilised SiC Schottcky diodes for high power capability. The Class-D topology has reached efficiencies up to 95% and the Class-E up to 90%. Both topologies achieved their highest efficiencies at high voltage operation as the parasitic capacitances of the SiC diodes were...
A novel parallel double-layer spiral coil for coupled magnetic resonance wireless power transfer (WPT) is proposed in this paper. The various characteristics are investigated by using simulation and experiment. Compare to a conventional double-layer spiral coil of the same geometric size, the parallel double-layer spiral coil could improve the quality factor by about 59%, due to the lower resistance...
This paper describes a design of a power transfer inductive link for charging batteries of wireless sensor network nodes. The application physical constraints imposes a maximum size for the coils and demands a design methodology to maximize output power delivered to the load and energy transmission efficiency. This paper presents a complete methodology for designing the coils of wireless power transfer...
Recent years have witnessed the booming development of resonant wireless power transfer (RWPT). Compared with conventional inductive power transfer, the frequency of RWPT is usually much higher. To reduce the resonant frequency while maintaining the transfer efficiency constant at the same transfer distances, two solutions are proposed and realized in this letter. Two fundamental structures for RWPT...
This research focuses on Wireless Power Transfer (WPT) systems, especially the inductive coupling type. The WPT systems applied to the battery charger system of Electric Vehicle (EV) and Plug-in Hybrid Vehicle (PHV) are investigated. In this application, it is necessary to keep the inductive coupling coils at a short distance and set the coils appropriately in order to achieve high transmission efficiency...
This paper proposes a simplified method for designing four-coil resonant wireless power transfer (WPT) networks by sequential application of impedance reflection through mutual inductances. Experimental validation is presented, and accuracy and limitations of the method are described. The method appears useful for first-pass (approximate) design, but accurate simulation requires consideration of mutual...
There are currently various proposals for method of wireless power transmission. Electromagnetic induction method has been known as a relatively efficient transmission method for a wide variety of application. Here we report the results of recent investigations about the “LC booster method,” a new electromagnetic induction-based system. This method make it possible to using Hi-Q Coil and load-matching,...
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