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Auxiliary circuits for selection and enhancement of multi-frequency wireless power transfer to multiple loads

A wireless power transmission and auxiliary circuit technology, applied in the direction of circuit devices, electrical components, etc., can solve the problem of low power transmission efficiency of the system, and achieve the effect of reducing cross-interference

Active Publication Date: 2017-02-22
THE UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If only the direct path is used, the power transfer efficiency of the system will be much less

Method used

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  • Auxiliary circuits for selection and enhancement of multi-frequency wireless power transfer to multiple loads
  • Auxiliary circuits for selection and enhancement of multi-frequency wireless power transfer to multiple loads
  • Auxiliary circuits for selection and enhancement of multi-frequency wireless power transfer to multiple loads

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Embodiment Construction

[0044] According to the present invention, in order to utilize the indirect power path, such as Figure 5 A new auxiliary circuit is provided as shown in Assume that the tuned resonant frequencies of Resonator-A and Resonator-B are and , by means of Figure 6 The diagram shown in to explain the function of the auxiliary circuit for the receiver.

[0045] Figure 6 A-6D shows four types of auxiliary circuits to cover shunting resonant branches and blocking non-targeted frequency power flow for series-connected and parallel-connected loads in receivers. frequency of power flow using parallel resonant branches. In the conventional approach, the receiver consists of a resonant inductor (L), a resonant capacitor (C) and L and C in series and with C A load R connected in parallel.

[0046] Figure 6 A shows an exemplary circuit including a shunt resonant branch that bypasses current at a non-targeted frequency for a series connected load. The circuit includes auxiliary ...

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Abstract

This invention is related to a novel method and apparatus that provides selective and enhanced power flow in wireless power transfer systems with multiple receivers. Auxiliary circuits are introduced in the receiver circuits (and relay circuits if applicable) so as to ensure proper frequency-selective wireless power flow to the appropriate targeted receivers, with the pickup power by the non-targeted receivers substantially reduced even if the chosen tuned frequencies for different receivers are not widely apart.

Description

technical field [0001] The present invention relates to wireless power transfer, and more particularly to multi-frequency wireless power transfer. Background technique [0002] Wireless power transfer technology has reemerged as a viable technology for home and industrial applications. Recently, multi-frequency wireless power transfer has been proposed as a means to enhance wireless power transfer. Article by K. Lee and S. Lukic titled "Inductive power transfer by means of multiple frequencies in the magneticlink", IEEE Energy Conversion Congress and Exposition (ECCE), Denver, USA, September 2013, Pages: 2912-2919 In , multiple resonant tanks are used at the transmitter and receiver to amplify and extract power at multiple frequencies. In the Lee article, power transfer is performed at the fundamental frequency of 25 kHz and the third harmonic of 75 kHz. The power transfer is spread over more than one frequency, thereby increasing the power transfer. Single frequency rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/40H02J50/12H02J50/50
CPCH02J50/12H02J50/50
Inventor 钟文兴许树源
Owner THE UNIVERSITY OF HONG KONG
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