Measuring heart-rate using wireless power charging receiver coil

2018 ◽  
Author(s):  
KangHwi Lee ◽  
Seong-Su Lee ◽  
Sang-Min Kim ◽  
Kyeong-Seop Kim ◽  
Jeong-Whan Lee
Keyword(s):  
Heart Rate ◽  
Receiver Coil ◽  
Wireless Power

Development of in‐wheel receiver coil for dynamic wireless power transfer

2021 ◽  
Vol 214 (4) ◽  
Author(s):  
Osamu Shimizu ◽  
Takashi Utsu ◽  
Hiroshi Fujimoto ◽  
Daisuke Gunji ◽  
Isao Kuwayama
Keyword(s):  
Wireless Power Transfer ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Free-Positioning Wireless Power Transfer Using a 3D Transmitting Coil for Portable Devices

2020 ◽  
Vol 20 (4) ◽  
pp. 270-276
Author(s):  
Nam Ha-Van ◽  
Hoang Le-Huu ◽  
Minh Thuy Le ◽  
Kwangsuk Park ◽  
Chulhun Seo
Keyword(s):  
Three Dimensional ◽  
Wireless Power Transfer ◽  
Receiver Coil ◽  
Portable Devices ◽  
Power Transfer ◽  
Wireless Power ◽  
Transfer Energy ◽  
Resonant Coupling ◽  
Power Transfer Efficiency ◽  
Receiving Coil

The free-positioning wireless power transfer (WPT) system has drawn attention in recent years. Traditionally, a WPT system can transfer energy in one or two directions on the same plane, but it leads the restrictions of angle and axis misalignment between a transmitter and a receiver coil. In this paper, we propose a free-positioning WPT system using a three-dimensional cubic-shaped transmitting coil for portable device charging. A small receiving coil is placed inside the transmitter to achieve the transferred energy through the magnetic resonant coupling. In addition, the equivalent circuit and the mutual inductance between the Tx and Rx coils are analyzed. Finally, a practical experiment is implemented to verify the transfer performance, which can reach up to about 50% power transfer efficiency. The proposed system can charge in spatial freedom.

scholarly journals Wireless Power Transfer Using Harvested Radio Frequency Energy with Magnetic Resonance Coupling to Charge Mobile Device Batteries

2021 ◽  
Vol 11 (16) ◽  
pp. 7707
Author(s):  
Neetu Ramsaroop ◽  
Oludayo O. Olugbara
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Radio Frequency ◽  
Mobile Device ◽  
Receiver Coil ◽  
Wireless Power ◽  
Magnetic Resonance Coupling ◽  
Transmitter Coil ◽  
Resonance Coupling ◽  
Rf Energy

This research paper presents the design of a wireless power transfer (WPT) circuit integrated with magnetic resonance coupling (MRC) and harvested radio frequency (RF) energy to wirelessly charge the battery of a mobile device. A capacitor (100 µF, 16 V) in the RF energy harvesting circuit stored the converted power, and the accumulated voltage stored in the capacitor was 9.46 V. The foundation of the proposed WPT prototype circuit included two coils (28 AWG)—a transmitter coil, and a receiver coil. The transmitter coil was energized by the alternating current (AC), which produced a magnetic field, which in turn induced a current in the receiver coil. The harvested RF energy (9.46 V) was converted into AC, which energized the transmitter coil and generated a magnetic field. The electronics in the receiver coil then converted the AC into direct current (DC), which became usable power to charge the battery of a mobile device. The experimental setup based on mathematical modeling and simulation displayed successful charging capabilities of MRC, with the alternate power source being the harvested RF energy. Mathematical formulae were applied to calculate the amount of power generated from the prototype circuit. LTSpice simulation software was applied to demonstrate the behavior of the different components in the circuit layout for effective WPT transfer.

scholarly journals Effect of Coil Structure on the Efficiency of Wireless Power Transfer System

2019 ◽  
Vol 9 (2) ◽  
pp. 3387-3392
Keyword(s):  
Wireless Power Transfer ◽  
Receiver Coil ◽  
Transfer System ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Charging System ◽  
Coil Structure ◽  
Power Transfer Efficiency ◽  
Wireless Power Transfer System

A typical magnetic resonance based wireless power transfer (WPT) system comprises a transmitter coil and an embedded receiver coil used for wireless charging of the electrical and electronics devices. It has been investigated that the coil structure influence the power transfer efficiency of the wireless charging system .The investigations have been carried out in order to determine a suitable coil type and geometry so as to achieve higher efficiency of a wireless power transfer system. The present investigation will afford the design strategy for an efficient wireless charging system .

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.

Optimization Based on Frequency and Driving Voltage Control for Wireless Power Transmission System

2013 ◽  
Vol 846-847 ◽  
pp. 603-606
Author(s):  
Qi Shao ◽  
Xue Lin Fang ◽  
Hao Liu ◽  
Hong Yi Li
Keyword(s):  
Power Transmission ◽  
External Disturbance ◽  
Voltage Control ◽  
Transmission System ◽  
Receiver Coil ◽  
Driving Voltage ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Experiment Platform ◽  
Power Transmission System

This paper presents the frequency and driving voltage control based on PID controller for wireless power transmission system to restrain the influence of external disturbance and the movement of receiver coil. The phase difference of the voltage and current of the resonant tank is used by the frequency controller to control the frequency of DDS signal source to match the resonant frequency. The received voltage is detected wirelessly by the driving voltage controller to control the output voltage of switching power source to match the power need of the receiver. The experiment platform was built to verify the performance of the controllers. The results show that both controllers could operate normally to improve the stability and safety of the WPT system.

Wirelessly Powered Electrowetting-on-Dielctric (EWOD)

2011 ◽  
Author(s):  
Sang Hyun Byun ◽  
Sung Kwon Cho
Keyword(s):  
Power Transmission ◽  
Lab On A Chip ◽  
Transmission Efficiency ◽  
Inductive Coupling ◽  
Receiver Coil ◽  
Wireless Power ◽  
High Input ◽  
Electrowetting On Dielectric ◽  
Transmitter Coil ◽  
Operational Modes

Recently, EWOD (Electrowetting on dielectric) has attracted a great deal of interest with applications of digital lab-on-a-chip in which microfluids are manipulated in a discrete form of droplets using electrical inputs. In most EWOD applications, the commonly used powering method is wired transmission, which may not be suitable for implantable lab-on-a-chip applications. In this paper, we will investigate wireless power transmission for EWOD utilizing the inductive coupling. Unlike the conventional inductive coupling, wireless EWOD requires a high voltage (> 50 V) at the receiver side which is connected to the EWOD chip since EWOD naturally operates under high input voltages. To satisfy this condition, the resonant inductive coupling method at a high resonant frequency is introduced and investigated. To optimize the transmission efficiency, we study the effects of many parameters such as the frequency, the inductance and the capacitance at the transmitter as well as receiver, the gap between the transmitter coil and receiver coil, and so on, by measuring the voltage at the receiver and the contact angle of droplets placed on wirelessly operated EWOD chip. In addition, by introducing amplitude modulation (AM) to the resonant inductive coupling, wireless AC electrowetting which generates droplet oscillations and is one of the commonly used operational modes is also achieved.

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