A novel metal detector using the quality factor of the secondary coil for wireless power transfer systems

2012 ◽  
Author(s):  
Shinichi Fukuda ◽  
Hiroaki Nakano ◽  
Yuji Murayama ◽  
Tomomichi Murakami ◽  
Osamu Kozakai ◽  
...  
Keyword(s):  
Quality Factor ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Metal Detector

scholarly journals Effect of the DC-Link Capacitor Size on the Wireless Inductive-Coupled Opportunity-Charging of a Drone Battery

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2621 ◽  
Author(s):  
Andrea Carloni ◽  
Federico Baronti ◽  
Roberto Di Rienzo ◽  
Roberto Roncella ◽  
Roberto Saletti
Keyword(s):  
Excitation Frequency ◽  
Wireless Power Transfer ◽  
Experimental Tests ◽  
Secondary Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Large Current ◽  
Bridge Rectifier ◽  
Lc Filter ◽  
Filter Capacitor

Wireless inductive-coupled power transfer and opportunity battery charging are very appealing techniques in drone applications. Weight and size are very critical constraints in drones, so the battery and the on-board electronics must be as light and small as possible. The on-board components involved in the resonant inductive-coupled wireless power transfer usually consist of the secondary coil, the compensation capacitor, the bridge rectifier, the LC-filter and the battery. This paper suggests a sizing of the LC-filter capacitor that improves the charging power of the battery. In addition, further on-board space and size is saved by using the stray inductance of the battery as filtering inductor. LTSpice simulations and experimental tests carried out on the prototype of a wireless power transfer circuit shows the dependency of the power delivered to the battery on the filter capacitor size. Finally, it is found that the power transfer to the battery is maximized by choosing the capacitor value that sets the LC-filter resonant frequency close to the double of the excitation frequency of the wireless charging. The drawback is a large current and voltage ripple in the battery.

scholarly journals A Real-Car Experiment of a Dynamic Wireless Power Transfer System Based on Parallel-Series Resonant Topology

2019 ◽  
Vol 10 (3) ◽  
pp. 49
Author(s):  
Toshiyuki Fujita ◽  
Hiroyuki Kishi ◽  
Hiroshi Uno ◽  
Yasuyoshi Kaneko
Keyword(s):  
Electric Power ◽  
Electric Vehicles ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Series Resonant ◽  
Wireless Power Transfer System ◽  
Parallel Series

A short mileage and long charging times are problems facing electric vehicles (EVs), and dynamic wireless power transfer (WPT) systems are one of the most effective solutions to overcome these shortcomings. This paper proposes a dynamic WPT system consisting of several stationary primary underground coils and a secondary coil on an EV. The dynamic WPT system employed solenoid coils that were superior to circular coils in terms of misalignment to the traveling direction. A dynamic WPT system rated at 25 kW was designed, constructed, and tested to verify the principles of operation; that is, the capability of supplying electric power continuously.

EFFECT OF NUMBER OF TURNS AND MEDIUM BETWEEN COILS ON THE WIRELESS POWER TRANSFER EFFICIENCY OF AIMD’S

2019 ◽  
Vol 31 (02) ◽  
pp. 1950016
Author(s):  
B. P. Patil ◽  
Deepali Newaskar ◽  
Kunal Sharma ◽  
Tarun Baghmar ◽  
Mahesh Ku. Rajput
Keyword(s):  
Human Body ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Cardiac Pacemakers ◽  
Implantable Medical Devices ◽  
Body Tissues ◽  
Research Experiment

Active implantable medical devices (AIMDs) like implantable cardiac pacemakers play very important role in extending lives of patients with some cardiovascular diseases. The life of implantable device depends on life of battery. If this device can be charged from outside with power transfer device, then the cost of surgical procedures for patient can be saved. One must ensure, while transferring this power there should not be any abnormal effect on human body tissues. Wireless recharging of such devices through magnetic resonant coupling is of concern and hence the topic of more research to have uninterrupted supply from battery. The technique of wireless power transfer, primary or transmitting coil is assumed to be on body and receiver coil is assumed to be inside the human body. Several critical aspects need to be studied while designing coil for wireless power transfer (WPT). One of which is choice of operational frequency. In this research experiment, designed circuit is tested for checking power transfer was studied. Effect of the distance between primary and secondary coil affects the efficiency of power transfer. Authors also tied to test this for using different medium like air, placing 80 GSM paper and cloth. It is found that the medium between the primary and secondary affects the transfer of power. Careful thought needs to be given while designing power transfer system.

scholarly journals Design of a wireless measurement system for use in wireless power transfer applications for implants

2017 ◽  
Vol 4 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Basem M. Badr ◽  
Robert Somogyi-Csizmazia ◽  
Paul Leslie ◽  
Kerry R. Delaney ◽  
Nikolai Dechev
Keyword(s):  
Measurement System ◽  
Measurement Errors ◽  
Wireless Power Transfer ◽  
Impedance Match ◽  
Secondary Coil ◽  
Power Transfer ◽  
Induced Voltage ◽  
Wireless Power ◽  
Secondary Circuit ◽  
Wireless Measurement

The performance of wireless power transfer (WPT) systems is a function of many parameters such as resonance matching, coil quality factor, system impedance match, and others. When designing and testing WPT systems, reliable measurement of system performance is essential. In our application, we use WPT to power biomedical implants for telemetry acquisition from small rodents, where rodent behavior data is used to study disease models. Such an application employs a large primary coil and a much smaller moving secondary coil, which can be defined as a loosely coupled WPT (LCWPT) system. This paper presents a novel wireless measurement system (WMS) that is used to collect real-time performance data from the secondary circuit (implant), while testing LCWPT systems. Presently, measuring the performance of the secondary side of LCWPT systems while they are in operation can be problematic. The literature reports various measurement errors when using voltage/current probes, or coaxial cables placed directly into the primary magnetic field. We have designed the WMS to greatly reduce such measurement errors, where the WMS measures the induced voltage (and hence received power) and relays this information by radio. Experiments were done to test the WMS, as well as comparison with cable-based measurements.

scholarly journals Simulation Analysis of Wireless Power Transfer for Future Office Communication Systems

2019 ◽  
Vol 8 (9S) ◽  
pp. 533-538
Keyword(s):  
Output Power ◽  
Communication Systems ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Receiver Coil ◽  
Input Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Primary Coil ◽  
Transmitter Coil

A Wireless Power Transfer system consists of a transmitter coil which is inductively coupled with secondary coil and is popular for wireless charging of future office communication system. Wireless power transfer is used in different applications ranging from mobile chargers to charging stations. In this paper simulation of Wireless Power Transfer for future office communication systems has been conducted over Maxwell 3d of Ansys electromagnetic suite. The input frequency of primary coil is varied from 1kHz -120kHz with respect to the change in resonant capacitance and observed that input frequency between 20kHz-30 kHz, the output power in secondary coil appears to be maximum at variable distances between transmitter coil and receiver coil. There is an improvement of 72% seen in the output power of secondary coil for 25kHz input frequency of primary coil as compared with 40kHz input frequency. This model can be helpful to design future Office Communication systems for charging the mobile phones, Laptops and to turn on the printer wirelessly.

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