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Wireless power transmission system and wireless power transmission apparatus

A technology for wireless power and transmission systems, applied in circuit devices, electromagnetic wave systems, near-field transmission systems using transceivers, etc., and can solve problems such as influence

Inactive Publication Date: 2012-07-11
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, a change in the internal impedance of one receiver affects not only the transmitter but also other receivers

Method used

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  • Wireless power transmission system and wireless power transmission apparatus
  • Wireless power transmission system and wireless power transmission apparatus
  • Wireless power transmission system and wireless power transmission apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] figure 1 It is a diagram showing the configuration of an embodiment of an ID-controlled one-to-many wireless power transmission system according to the present invention, which is composed of a transmitter and two receivers, that is, a first receiver and a second receiver. The directional coupler 6 of the transmitter is connected to the transmission part variable reactance circuit 2 coupled to the transmission part antenna 1, and the carrier generation circuit 8 of the modulator 3 and the parallel connection of the transmission part demodulator 7 and the detection circuit 9 are interposed. Also connected with this directional coupler 6, the output of this transmitter demodulator 7 and detection circuit 9 is input to transmitter control circuit 4, this transmitter control circuit 4 is connected with storage circuit 5, and is connected with carrier generation circuit 1 The input signal of the transmitter controls the transmitter modulator 3 and the variable reactance circ...

Embodiment 2

[0066] figure 2 It is a flowchart showing the operation of a transmitter which is a constituent element of an ID control one-to-many wireless power transmission system according to the present invention. Since the transmitter cannot generate unlimited power, the allowable maximum output Pmax is predetermined. Ideally, all the electric power generated from the carrier wave generation circuit 8 is output from the transmitter antenna 1 to the outside space, but actually a part of the power is not output to the outside and returns to the inside of the transmitter. Since high-efficiency power transfer efficiency from the transmitter to the receiver is achieved by reducing this returned power, the maximum allowable value of this returned power is determined in advance as the allowable reflected power Prt_max. In order to keep the output of the carrier generation circuit 8 to a certain limit, a part of the output of the carrier generation circuit 8 is branched and monitored. When ...

Embodiment 3

[0070] image 3 It is a flowchart showing the operation of a receiver which is a component of an ID control one-to-many wireless power transmission system according to the present invention. The receiver specifies a preset required power reception amount as the desired reception power Pdsr. Generally, since a receiver is required to be miniaturized, the scale of the variable reactance circuit 12 of the receiving unit cannot be increased, and the variable width of the reactance value is limited by Xmix and Xmax.

[0071] First, the receiver determines the initial reactance value of the receiving unit variable reactance circuit 12, and the receiving unit control circuit 14 monitors the output of the rectifying circuit 16 to obtain the received power at that time. When the received power reaches Pdsr, the ID, the received power value, and the information on power reception are transmitted to the transmitter as they are.

[0072] If the received power does not reach Pdsr, the re...

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PUM

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Abstract

A wireless power transmission system comprising a small number of transmitters and further comprising a large number of receivers having their respective unique IDs is provided wherein a transmitter uses the IDs to control the variable reactance within the transmitter and the variable reactances within the receivers by one operation to perform one-to-many power transmission. Specifically, a one-to-many wireless power transmission system is achieved wherein the power transmission efficiency can be adaptively controlled. A transmitter registers unique IDs transmitted by receivers; requests, for each ID, a power reception status report from the receiver; and controls the variable reactance within the transmitter and the variable reactance within the receiver by one operation in accordance with the content of the report, thereby dynamically optimizing the power transmission efficiency in the system.

Description

technical field [0001] The present invention relates to a system, device and method for wirelessly transmitting power using electromagnetic waves, and is particularly suitable for use in the Fresnel region where electrostatic fields and induction fields play a major role in the energy interaction of electromagnetic fields compared with radiation fields A wireless power transmission system for power transmission, a wireless power transmission device, and a power transmission method, particularly an ID-controlled one-to-many wireless power transmission system for selectively transmitting power from a plurality of receivers to a prescribed receiver using an ID, and ID controls one-to-many wireless power transmission devices, and also relates to a wireless power supply charging system. Background technique [0002] In the past, as a system for wireless power transmission, there is passive RFID, which uses the radiation field component of the electromagnetic wave emitted from the...

Claims

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Application Information

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IPC IPC(8): H02J17/00H04B5/02
CPCH02J5/005H02J50/80H02J50/40H02J50/20
Inventor 武井健
Owner HITACHI LTD
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