Wireless power transmission apparatus

• US 10,804,708 B2
• Filed: 09/27/2017
• Issued: 10/13/2020
• Est. Priority Date: 02/05/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hirasaka, Hisato, Hirose, Toshiyuki, Hirose, Toshihiko, Makise, Tetsuro, Itou, Akira
• Primary Examiner(s): Cavallari, Daniel J
• Application Number:
  US15/716,982
• Publication Number:
  US 20180019617A1
• Time in Patent Office: 1,112 Days
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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: H04K 1/10 by using two signals transmitted simultaneously or successively
• CPC Class Codes: H04L 63/0442 wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30
• CPC Class Codes: H04L 63/083 using passwords cryptographic mechanisms or cryptographic arrangements for entity authentication using a predetermined code H04L9/3226
• CPC Class Codes: H04W 12/065 Continuous authentication
• CPC Class Codes: Y04S 40/20 Information technology specific aspects, e.g. CAD, simulation, modelling, system security

Abstract

A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Claims

1. A wireless power transmission apparatus comprising:

a transmitter configured to wirelessly transmit electric power;

frequency variable circuitry configured to change a resonant frequency;

detection circuitry configured to detect reception power by a power receiver; and

a control circuitry configured to control the frequency variable circuitry to maximize the reception power based upon the detection result,

wherein the transmitter is configured to transmit the electric power while the resonant frequency is changed, and

the control unit is configured to initialize the resonant frequency at a predetermined value and incrementally change the resonant frequency to maximize the reception power, the incremental change being by a predetermined amount until the control unit determines that a corresponding reception voltage no longer increases.

2. The wireless power transmission apparatus according to claim 1, wherein the transmitter and the receiver are configured to include an authentication sequence for sharing a changing sequence for a same resonant frequency and to wirelessly transmit data corresponding to authentication to each other.

3. The wireless power transmission apparatus according to claim 2, wherein

the receiver is configured to perform encryption processing including a public key and a secret key, and

the transmitter is configured to perform encryption processing corresponding to the public key.

4. The wireless power transmission apparatus according to claim 2, wherein the transmitter and the receiver perform authentication and sequence distribution in a power transmission line.

5. The wireless power transmission apparatus according to claim 2, wherein the transmitter and the receiver perform authentication and sequence distribution in a wireless transmission line separate from a power transmission line.

6. The wireless power transmission apparatus according to claim 1, wherein the transmitter and the receiver periodically select one or plural specific frequencies fa.

7. The wireless power transmission apparatus according to claim 1, wherein the receiver has a function of notifying the transmitter of a power demand request.

8. The wireless power transmission apparatus according to claim 7, wherein the transmitter has a function of increasing or reducing transmission power according to a power demand request of one or plural receivers.

9. The wireless power transmission apparatus according to claim 1, wherein the transmitter is incorporated in a table.

10. The wireless power transmission apparatus according to claim 1, wherein the incremental change is an incremental increase.

11. The wireless power transmission apparatus according to claim 1, wherein the control unit is configured to automatically adjust the resonant frequency to equal a transmitting resonant frequency of the transmitter.