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Control device, power transmission device, power reception device, and control method

A technology for control devices and control parts, which is applied in the direction of circuit devices, electrical components, electromagnetic wave systems, etc., and can solve problems such as difficulty in coupling coefficient and difficulty

Inactive Publication Date: 2015-04-08
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not easy to estimate the resonance frequency of the power transmitting resonator and the resonance frequency of the power receiving resonator with high precision, and it is also not easy to estimate the coupling coefficient with high precision.

Method used

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  • Control device, power transmission device, power reception device, and control method
  • Control device, power transmission device, power reception device, and control method
  • Control device, power transmission device, power reception device, and control method

Examples

Experimental program
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no. 1 Embodiment approach

[0046] Such as figure 1 As an example, the wireless power transmission system of the first embodiment includes a control device 100 , a power transmission resonator 111 , a frequency variable signal source 112 , a power reception resonator 121 , and a variable impedance element 122 .

[0047] In addition, in figure 1 In the wireless power transmission system of , the power transmitting device includes at least a power transmitting resonator 111 , and the power receiving device includes at least a power receiving resonator 121 . The control device 100 may be embedded in the power transmission device or the power reception device, or may be installed independently of the power transmission device and the power reception device.

[0048]In the following description, it is assumed that the variable frequency signal source 112 is included in the power transmitting device, and the variable impedance element 122 is included in the power receiving device. The frequency-variable sign...

no. 2 Embodiment approach

[0139] Such as Figure 16 As an example, the wireless power transmission system of the second embodiment includes a control device 200 , a power transmission resonator 211 , a drive signal source 212 , an inverter 213 , a power reception resonator 221 , and a variable impedance element 222 .

[0140] The power transmission resonator 211 may be the same as or similar to the power transmission resonator 111 described above. The power receiving resonator 221 may be the same as or similar to the power receiving resonator 121 described above. The variable impedance element 222 may be the same as or similar to the variable impedance element 122 described above. The control device 200 differs from the control device 100 described above in part of its operations.

[0141] Figure 16 The drive signal source 212 and the inverter 213 can be regarded as a constant voltage frequency variable signal source. That is, the driving signal source 212 and the inverter 213 are equivalent to f...

no. 3 Embodiment approach

[0148] Such as Figure 19 As an example, the wireless power transmission system of the third embodiment includes a control device 300 , a power transmission resonator 311 , a frequency variable signal source 312 , a power reception resonator 321 , a variable impedance element 322 , a wireless communication unit 331 , and a wireless communication unit 332 .

[0149] The power transmission resonator 311 may be the same as or similar to the power transmission resonator 111 described above. The variable frequency signal source 312 may be the same as or similar to the above variable frequency signal source 112 , or the driving signal source 212 and the inverter 213 . The power receiving resonator 321 may be the same as or similar to the power receiving resonator 121 described above. The variable impedance element 322 may be the same as or similar to the variable impedance element 122 described above. The control device 300 differs from the control device 100 or the control devic...

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Abstract

According to an embodiment, this control device includes a control unit and an estimation unit. The control unit instructs a variable-frequency signal source, which generates an input signal to a second resonator coupled to a first resonator, to perform a first frequency sweep of the input signal under a first impedance condition. The control unit instructs the variable-frequency signal source to perform a second frequency sweep of the input signal under a second impedance condition. The estimation unit detects one or more first specific frequencies that give the maximum or minimum value of the input signal while the first frequency sweep is being performed. The estimation unit detects one or more second specific frequencies that give the maximum or minimum value of the input signal while the second frequency sweep is being performed. The estimation unit estimates a coupling coefficient for the first resonator and the second resonator, a first resonant frequency of the first resonator, and / or a second resonant frequency of the second resonator on the basis of the one or more first specific frequencies and the one or more second specific frequencies.

Description

technical field [0001] Embodiments relate to wireless power transfer. Background technique [0002] Conventionally, in a wireless power transmission system, it is known that an input current or an input voltage of a power transmission resonator (power transmission resonator) changes with a change in load impedance. Also, a technique of estimating a coupling coefficient from a change in an input current or an input voltage with respect to a change in the oscillation frequency of a power transmission resonator has been proposed. The coupling coefficient corresponds to the degree of magnetic coupling between the inductor included in the power transmitting resonator and the inductor included in the power receiving resonator. [0003] According to the technique described above, the coupling coefficient is estimated using equivalent circuits of the power transmitting device and the power receiving device. Therefore, the estimation accuracy of the coupling coefficient depends on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00H03H7/40
CPCH04B5/00H02J17/00H02J50/10H02J50/80H02J50/90H04B5/0037H02J50/12
Inventor 鬼塚浩平
Owner KK TOSHIBA