Arrangement of a Rectifier to Suppress Electromagnetic Field Leakage for Capacirtive Coupling Wireless Power Transfer
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Wireless Power Transfer
Leakage (economics)
Rectifier (neural networks)
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Wireless power transfer (WPT) technology enables convenient and automatic battery charging for drone. In spite of the great advantages, WPT system inevitably generates strong electromagnetic fields (EMFs), which causes interference on the nearby electrical devices. In order to reduce the effects of magnetic near-field noise and losses, a reduction in the harmonics of the source current is required. Therefore, we propose three phase wireless charging scheme with duty control of voltage source inverter (VSI) for a low electromagnetic interference (EMI) wireless charger.
Wireless Power Transfer
Battery charger
Electromagnetic Compatibility
Duty cycle
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Wireless power transfer systems using near-field magnetic coupling are attractive as they allow power transfer with high efficiency and do not require an unobstructed path between transmitter and receiver. In this work a two coil wireless power transmission system is analyzed, including the driving amplifier, and a demonstration system is built and characterized. The system achieves 76% efficiency for a distance of 1 meter for 40 W transferred power. The effects of changes to the geometry of the system (pitch angle of coils, separation distance) are also examined, and the effect on amplifier topologies analyzed.
Wireless Power Transfer
Power transmission
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This paper presents challenges and solutions to implementing a passive rectifier in a high-frequency capacitive wireless power transfer (WPT) system suitable for electric vehicle (EV) charging. For this study, a prototype 13.56-MHz 12-cm air-gap capacitive WPT system utilizing 22-cm diameter coupling plates is designed, built and tested. The system is first tested in dc-to-high-frequency ac mode with a resistive load. In this mode the prototype system transfers 895 W at an efficiency of 93%. The prototype is then evaluated in dc-to-dc mode with a full-bridge passive rectifier. In this mode the power transfer and efficiency are severely reduced. It is found that this degradation is partly due to detuning of the system's resonant frequency, caused by the parasitic output capacitance of the rectifier diodes. To retune the system, its operating frequency is changed to 13.28 MHz, allowing the performance to be partially recovered, but only up to 533 W at an efficiency of 69%. The remainder of the degradation is found to be due to the rectifier's capacitance unfavorably changing the gain and reactive compensation of the L-section matching network that connects the coupling plates to the rectifier. This paper introduces the use of an appropriate-valued inductor in parallel with the rectifier to nullify the effects of its parasitic capacitance. Incorporating this inductor, the system is able to operate at the original 13.56-MHz frequency and transmits 774 W of power at an efficiency of 81%.
Rectifier (neural networks)
Wireless Power Transfer
Capacitive coupling
Parasitic capacitance
Resistive touchscreen
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Wireless Power Transfer
Inductive coupling
Resonant inductive coupling
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Resonant inductive coupling
Wireless Power Transfer
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Wireless power transmission using magnetic resonant coupling has attracted considerable attention as a key technology to realize high efficiency in mid-range transmission. Suppressing unwanted electromagnetic radiation is an important criterion in terms of electromagnetic compatibility. This paper proposes a new resonator design to suppress electromagnetic leakage based on a loop-antenna analysis. Although the power efficiency of our proposed resonator is lower than that of conventional loop coils, electromagnetic leakage is reduced dramatically. The power efficiency is more than 80% when the vertical and horizontal air gaps are less than 20 and 10 mm, respectively, for a 50-mm resonator radius.
Inductive coupling
Leakage (economics)
Power transmission
Electromagnetic Compatibility
Loop antenna
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Wireless Power Transfer
Leakage (economics)
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In this paper a new technology termed Capacitive Power Transfer (CPT) is investigated to achieve contactless power transfer. Compared to traditional Inductive Power Transfer (IPT) technology, the advantages of CPT include the ability to supply power through metal barriers, reducing standing power losses, and alleviating EMI (Electromagnetic Interference). Electric coupling is a key part in a CPT system as it dominates the maximum power transfer capacity and the performance of the system. Different applications can have very different coupling structures and power level requirements. This paper proposes two types of coupling structures, disk and cylinder, for a rotary CPT system application. The system frequency, maximum output power, and power losses based on the cylindrical structure which has a larger coupling capacitance are analyzed. Simulation and experimental studies are carried out to verify the proposed coupling configurations.
Wireless Power Transfer
Direct coupling
Capacitive coupling
Inductive coupling
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Wireless Power Transfer
Power density
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This paper describes a method to reduce magnetic field leakage from a Wireless Power Transfer (WPT) systems. By using frequency split phenomena, the reactive shield can reduce the magnetic field of the target frequency band with increasing power transfer efficiency. The simulation results of the suggested reactive shielding coil structure are verified with a 50W-WPT system.
Wireless Power Transfer
Frequency band
Leakage (economics)
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Citations (2)