• Title/Summary/Keyword: Wireless Power Transmission

Search Result 996, Processing Time 0.031 seconds

Efficiency Analysis of Magnetic Resonance Wireless Power Transmission using Superconductor Coil According to the Changing Position of Transmission and Receiving Coils (초전도 코일을 적용한 자기공명방식 무선전력전송의 송·수신 코일 배열에 따른 효율 분석)

  • Kang, Min-Sang;Choi, Hyo-Sang;Jeong, In-Sung
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.63 no.6
    • /
    • pp.776-779
    • /
    • 2014
  • In this paper, we analyzed the efficiency of magnetic resonance wireless power transmission (WPT) using superconductor coil according to the changing position of transmission and receiving coils. We implemented a WPT system using a magnetic resonance at a frequency of 63.1 kHz. Transmission and receiving coils using superconductor coil were wound on a spiral manner of diameter 100mm. For comparison, transmission and receiving coils using normal conductor coil were designed under the same condition. At a distance of 50mm, we measured efficiency when transmission-receiving coils were matched 25%, 50%, 75% and 100%. When a superconductor coil was applied to the transmission and receiving units, efficiency of WPT was very high. In addition, in the case of the superconducting transmission-receiving coils, when coils matched 100% the efficiency was 30% and matched 25% the efficiency was 8%.

Efficiency Enhancement of a Wireless Power Transmission System Applying a Superconducting Coil (초전도 코일을 적용한 무선전력전송 시스템 효율 향상)

  • Kang, Min-Sang;Choi, Hyo-Sang;Jeong, In-Sung
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.2
    • /
    • pp.353-356
    • /
    • 2015
  • Due to high oil prices, environmental pollution, the study of electric vehicles have been actively promoted. Charger for the electric vehicle is being developed using wireless rather than cable options. In this paper, we got more efficiency from using a superconducting transmission coil compared to using a normal coil. We implemented a wireless power transmission system using a magnetic induction at a frequency of 63.1 kHz. For comparison, a transmitter was designed using a superconducting coil and a normal coil. In addition, a receiver used a normal coil to apply for electric vehicles. The applied voltage and current were12 V and 5 A. Efficiency at a distance of 40 ~ 80 mm was measured. As a result, the superconducting transmission coil had a higher efficiency than the normal transmission coil. However, the receiving coil should be normal conductor for stable operation considering that it was put in moving electric vehicle. The efficiency was increased to 44 % at a distance of 40 mm when the diameter of normal receiving coil was 120 mm.

A Design of High Efficiency Microwave Wireless Power Acceptor IC (고효율 마이크로파 무선 전력 수신 집적회로 설계 및 구현)

  • Jung, Won-Jae;Jung, Hyo-Bin;Kim, Sang-Kyu;Jang, Jong-Eun;Park, Jun-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.62 no.8
    • /
    • pp.1125-1131
    • /
    • 2013
  • Wireless power transmission technology has been studied variety. Recently, wireless power transmission technology used by resonance and magnetic induction field is applied to various fields. However, magnetic resonance and inductive coupling are have drawbacks - power transmission distance is short. Microwave transmission and accept techniques have been developed to overcome short distance. However, improvement in efficiency is required. This paper, propose a high-efficiency microwave energy acceptor IC(EAIC). Suggested EAIC is consists of RF-DC converter and DC-DC converter. Wide Input power range is -15 dBm ~ 20 dBm. And output voltage is boosted up to 5.5 V by voltage boost-up circuit. EAIC can keep the output voltage constant. Available efficiency of RF-DC converter is 95.5 % at 4 dBm input. And DC-DC efficiency is 94.79 % at 1.1 mA load current. Fully EAIC efficiency is 90.5 %.

Double-Loop Coil Design for Wireless Power Transfer to Embedded Sensors on Spindles

  • Chen, Suiyu;Yang, Yongmin;Luo, Yanting
    • Journal of Power Electronics
    • /
    • v.19 no.2
    • /
    • pp.602-611
    • /
    • 2019
  • The major drawbacks of magnetic resonant coupled wireless power transfer (WPT) to the embedded sensors on spindles are transmission instability and low efficiency of the transmission. This paper proposes a novel double-loop coil design for wirelessly charging embedded sensors. Theoretical and finite-element analyses show that the proposed coil has good transmission performance. In addition, the power transmission capability of the double-loop coil can be improved by reducing the radius difference and width difference of the transmitter and receiver. It has been demonstrated by analysis and practical experiments that a magnetic resonant coupled WPT system using the double-loop coil can provide a stable and efficient power transmission to embedded sensors.

An Analysis of Voltage Multiplier Circuits for Smart Phone RF Wireless Charging (스마트폰 RF 무선충전을 위한 전압 체배기 회로 분석)

  • Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
    • /
    • v.20 no.2
    • /
    • pp.29-33
    • /
    • 2021
  • A 5.8-GHz 1W wireless power transmission system was used for charging a smart phone. The voltage of one RF power receiver with antenna was not enough for charging. Several power receivers for charging a smart phone was connected serially. The voltage of several RF power receivers are highly enough for charging a smart phone within 50cm. However, the lack of current from small capacitances of RF-DC converters is not suitable for charging smart phone. It means very long charging time. In this paper, the voltage multiplier circuits for RF-DC converters were analyzed to increase the current and voltage at the same time to reduce the charging time in smartphone RF wireless charging. Through the analysis of multiplier circuits, the 7-stage parallel multiplier circuit with voltage-doubler units are suitable for charging the smartphone, which supplies 5V and 700mA at 3V@5.8GHz.

Research and Implementation of Using RF wireless Power Transmission System for Wireless Sensor Nodes Battery-Charging Power Harvesting Module (RF 무선전력전송을 이용한 센서노드 배터리 충전용 전력획득모듈 연구 및 구현)

  • Jung, Won-Jae;Park, Jun-Seok
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.48 no.6
    • /
    • pp.34-42
    • /
    • 2011
  • With the progress of USN technology, fields to which wireless sensor node is applicable are increased under a condition that it holds a lot of problems to solve for betterment. One of the problems which acts as an obstacle to USN industry diffusion is the wireless sensor node battery exchange to their individual life cycle. Exchanging the battery of so many sensor nodes one by one requires a great deal of times and costs. Such problem is against the convenience supply -aim by applying USN technology. In this paper, using RF wireless power transmission system that power transmission / harvesting module from a distance of 5 m and the power of 10 dBm with a current of 1 mA or more for Sensor Nodes in lithium-polymer battery charging system tested and verified.

Performance comparison of the RF-DC converter circuit for wireless power transmission (무선전력전송을 위한 RF-DC 변환기 회로의 성능비교)

  • Choi, Ki-Ju;Hwang, Hee-Yong
    • Journal of Industrial Technology
    • /
    • v.29 no.B
    • /
    • pp.145-149
    • /
    • 2009
  • A RF-DC converter is one of the most important components for a wireless power transmission. It has been developed for many applications such as space solar power system, and Radio Frequency Identification(RFID). In this paper, we designed three types of RF-DC converter and compare the performance of each. All types RF-DC convertoer have a maximum conversion efficiency at input power level of 0 dBm~5 dBm and RF-DC converter of third type was the best performance that has a 21.9% of conversion efficiency.

  • PDF

Energy-efficient Real-time Computing by Utilizing Heterogenous Wireless Interfaces of the Smart Mobile Device in Small-IoT Environments (Small-IoT 환경에서 이기종 네트워크를 활용한 스마트 모바일 단말의 에너지 효율적 실시간 컴퓨팅 기법)

  • Lim, Sung-Hwa
    • Journal of the Semiconductor & Display Technology
    • /
    • v.20 no.3
    • /
    • pp.108-112
    • /
    • 2021
  • For smart mobile devices, the wireless communication module is one of the hardware modules that consume the most energy. If we can build a multi-channel multi-interface environment using heterogeneous communication modules and operate them dynamically, data transmission performance can be highly improved by increasing the parallelism. Also, because these heterogeneous modules have different data rates, transmission ranges, and power consumption, we can save energy by exploiting a power efficient and low speed wireless interface module to transmit/receive sporadic small data. In this paper, we propose a power efficient data transmission method using heterogeneous communication networks. We also compared the performance of our proposed scheme to a conventional scheme, and proved that our proposed scheme can save energy while guaranteeing reasonable data delivery time.

Power Stage Design for a Surface Wireless Power Transmission System using a Coupled Electric Field (전계결합을 이용한 면대면 무선 에너지 전송회로 개발)

  • Choi, Sung-Jin;Kim, Se-Yeong;Choi, Byung-Woo
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.20 no.2
    • /
    • pp.143-148
    • /
    • 2014
  • Conventional wireless power transfer methods based on coupled magnetic fields need a complex winding structure on the surface of the energy transfer and shows poor efficiency near metal objects due to the eddy current effect. In this study, to mitigate these problems, we investigate an electric field-coupled power transmission system, which is less prone to metal object problems and EMI. Because of the fundamental physical limit in the size of link capacitances, a half-bridge converter with an impedance matching transformer is proposed and the design procedure is derived to provide a soft-switching scheme. Hardware implementation shows that the proposed scheme with a pair of 10cm by 10cm copper plate can power a 1.4W USB FAN in a separation of 0.2mm by using insulating paper when driven by 227 kHz gate pulse.