WIRELESS POWER TRANSMISSION CONTROL DEVICE, WIRELESS POWER TRANSMISSION SYSTEM, AND WIRELESS POWER TRANSMISSION CONTROL METHOD

• US 20160336805A1
• Filed: 01/15/2015
• Published: 11/17/2016
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: YOSHIDA, Shuhei, TANOMURA, Masahiro, SHIZUNO, Kaoru
• Granted Patent: US 9,985,482 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B64U 50/34 In-flight charging photovoltaics B64U50/31
• CPC Class Codes: B64U 50/35 by wireless transmission, e.g. by induction
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

In order to stably supply power even under a condition such that variations in a transmission environment occur constantly and irregularly in a wireless power transmission, a wireless power transmission control device of the present invention includes: a data collection means for obtaining data indicating the characteristics of a transmission medium for wireless transmission of power via a receiving antenna provided in a movable body; a data prediction means for deriving predicted transmission characteristics that predict a change in the characteristics of the transmission medium by using the data and for calculating a control parameter corresponding to the predicted transmission characteristics; and a parameter control means for controlling the movable body and the receiving antenna by using the control parameter.

Claims

1. A control device for wireless power transmission, comprising:

a data collection unit which acquires data indicating a characteristic of a transmission medium when power is wirelessly transmitted via a power receiving antenna provided to a movable body;

a data prediction unit which derives a predicted transmission characteristic by predicting a change in the characteristic of the transmission medium by using the data and calculates a control parameter corresponding to the predicted transmission characteristic; and

a parameter control unit which performs control of the movable body and the power receiving antenna by using the control parameter.

2. The control device for wireless power transmission according to claim 1, wherein the control parameter comprises a parameter for deciding a position of the movable body, a parameter for deciding a frequency of the power receiving antenna, and a parameter for deciding a load of the power receiving antenna.

3. The control device for wireless power transmission according to claim 1, wherein the data collection unit comprises a plurality of sensors that detect the data, and the sensors detect different characteristics of the transmission medium.

4. The control device for wireless power transmission according to claim 1, wherein the control parameter is a parameter that optimizes power transmission efficiency.

5. The control device for wireless power transmission according to claim 1, wherein the control parameter is a parameter with which a response speed in performing the control is optimal.

6. The control device for wireless power transmission according to claim 1, further comprising:

a movable body control unit which controls a position of the movable body,

wherein the movable body control unit comprises a plurality of posture control unit corresponding to each axis of a coordinate system.

7. The control device for wireless power transmission according to claim 1, further comprising:

an antenna control unit which performs control of the power receiving antenna,

wherein the antenna control unit comprises;

a load control unit which controls load of the power receiving antenna; and

a frequency control unit which controls frequency of the power receiving antenna.

8. The control device for wireless power transmission according to claim 1, wherein the transmission medium is seawater and the characteristic comprises at least one of temperature, flow rate, and pressure of the seawater.

10. A wireless power transmission system comprising:

a movable body comprising the control device for wireless power transmission according to claim 1 and a power receiving antenna; and

a power transmitting device which wirelessly transmits power to the movable body,

wherein the control device for wireless power transmission determines transmission information comprising a frequency of the wireless power transmission and a target value of power transmission efficiency, and

the movable body transmits the transmission information to the power transmitting device.

9. A control method of wireless power transmission, comprising:

acquiring data indicating a characteristic of a transmission medium when power is wirelessly transmitted via a power receiving antenna provided to a movable body;

deriving a predicted transmission characteristic by predicting a change in the characteristic of the transmission medium by using the data;

calculating a control parameter corresponding to the predicted transmission characteristic; and

performing control of the movable body and the power receiving antenna by using the control parameter.