Analytical expressions for maximum transferred power in wireless power transfer systems

Kong, Sunkyu; Kim, Myunghoi; Koo, Kyoungchoul; Ahn, Seungyoung; Bae, Bumhee; Kim, Joungho

doi:10.1109/isemc.2011.6038340

Cited by 42 publications

(15 citation statements)

References 5 publications

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“…Effectively this circuit tuning has given the switch, when encased in the stainless steel case (thickness of 1.2 mm), greater switching strength to behave comparable to the untuned circuit within a plastic case. An average switching distance for the tuned potted circuit in a stainless steel case (52 × 28 × 14 × 1.2 mm) achieved in these tests is 7 mm, however further research has been conducted for the final circuit to maximise power transfer [11] hence increase the switching distance and therefore the final switching circuit (as shown in figure 2a and 2b) at the switch has been redesigned to accommodate amplifying/decoding circuit which enable final switching element to switch on and off with minimum load. Ten switches and actuators were assembled with modification of amplifying/decoding circuit and encapsulated within stainless steel enclosures.…”

Section: Circuit Analysis and Tuningmentioning

confidence: 98%

Behavior of Low Frequency Signal Through Stainless Steel Enclosures in Noncontact Safety Switch Application

Farrah¹,

Al-Shamma’a

2013

IEEE Sensors J.

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In this paper, we analyze a noncontact safety system, which consists of a switch and an actuator, designed for ultrahygienic applications using stainless steel enclosures. We explore the effect of different stainless steel thicknesses using different signal frequencies. Analysis of the effect of key components was researched to select suitable electronics to extend the activated switching distance up to 8 mm between switch and actuator. We analyze the transmission and reception of electromagnetic signals for a combination of a specific window frequency, specific material thickness, and content of stainless steel enclosures. We also explore unmet worldwide market demand for noncontact stainless steel frequency-operated switches.

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Section: Circuit Analysis and Tuningmentioning

confidence: 98%

Behavior of Low Frequency Signal Through Stainless Steel Enclosures in Noncontact Safety Switch Application

Farrah¹,

Al-Shamma’a

2013

IEEE Sensors J.

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“…It is well known from the literature that the maximum output power can be achieved by a conjugate matching of the equivalent input and output impedance of the system (Z in = Z * o ) [14], [21].…”

Section: B Efficiency and Extractable Powermentioning

confidence: 99%

A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

Berger

Agostinelli

Vesti

et al. 2015

IEEE Trans. Power Electron.

292

102

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Wireless Power Transfer (WPT) is an emerging technology with an increasing number of potential applications to transfer power from a transmitter to a mobile receiver over a relatively large air gap. However, its widespread application is hampered due to the relatively low efficiency of current WPT systems. This work presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in non-resonant operation. The proposed method is based on actively modifying the equivalent secondary-side load impedance by controlling the phaseshift of the active rectifier and its output voltage level. The presented hardware prototype represents a complete wireless charging system, including a DC-DC converter which is used to charge a battery at the output of the system. Experimental results are shown for the proposed concept in comparison to a conventional synchronous rectification approach. The presented optimization method clearly outperforms state-ofthe-art solutions in terms of efficiency and extractable power.

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“…Conventional single-input and single-output (SISO) systems which include one transmitter (TX) and one receiver antenna (RX) via close and mid-ranges have been examined in details [12][13][14][15][16][17][18][19]. In such systems, the wireless power transfer and efficiency are limited by the antenna size and distance, as the electromagnetic fields decay exponentially when the transfer distance increases and diverge quickly when antenna size is small.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Inputs and Multiple-Outputs Wireless Power Combining and Delivering Systems

Nguyen

Chou

Plesa

et al. 2015

IEEE Trans. Power Electron.

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In this paper, we investigated the effect of power combining and delivering in multi-input and multi-output (MIMO) wireless energy transmission systems which consist of more than one transmitter antennas as sources, more than one receiver antennas as loads and repeaters. Theoretical expressions were developed to model system operation that can be in a large scale wireless energy network architecture. System characteristics such as power transfer between antennas, power losses induced in each antenna, wireless efficiency, coil misalignment and power fluctuation due to the loss of frequency synchronization were examined by theory and verified with experiments. Measurement results matched well with the theory demonstrating the feasibility of combining and delivering power with high efficiencies in large scale wireless energy transmission systems.

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Analytical expressions for maximum transferred power in wireless power transfer systems

Cited by 42 publications

References 5 publications

Behavior of Low Frequency Signal Through Stainless Steel Enclosures in Noncontact Safety Switch Application

Behavior of Low Frequency Signal Through Stainless Steel Enclosures in Noncontact Safety Switch Application

A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

Multiple-Inputs and Multiple-Outputs Wireless Power Combining and Delivering Systems

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