Power transmission apparatus, method for controlling power transmission apparatus, and storage medium storing program

• US 10,063,112 B2
• Filed: 03/18/2016
• Issued: 08/28/2018
• Est. Priority Date: 03/18/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tachiwa, Wataru
• Primary Examiner(s): BARNIE, REXFORD N
• Assistant Examiner(s): Shiao, David
• Application Number:
  US15/074,699
• Publication Number:
  US 20160276841A1
• Time in Patent Office: 893 Days
• 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 a case where a notification signal is received from a second power reception apparatus different from a first power reception apparatus while power transmission is performed to the first power reception apparatus, power transmission to the second power reception apparatus is performed according to a result of negotiation with the second power reception apparatus if a power reception value corresponding to information included in the notification signal received from the second power reception apparatus is a sufficient value. The second power reception apparatus is not targeted for the power transmission if the power reception value corresponding to the information included in the notification signal received from the second power reception apparatus is not a sufficient value.

Claims

1. A power transmission apparatus comprising:

a power transmission circuit configured to perform power transmission;

a communication circuit configured to perform wireless communication; and

a control unit configured to control power transmission to a first power reception apparatus by the power transmission circuit in accordance with a result of a negotiation to establish power transmission with the first power reception apparatus using communication by the communication circuit,

wherein, where a signal is received by the communication circuit from a second power reception apparatus that is different from the first power reception apparatus during the power transmission to the first power reception apparatus, the control unit is configured to determine whether to perform a negotiation to establish power transmission with the second power reception apparatus on a basis of a comparison between a predetermined value and a power reception value that is included in the signal received from the second power reception apparatus, the power reception value indicating an amount of power received by the second power reception apparatus during the power transmission to the first power reception apparatus;

wherein, where it is determined to perform the negotiation with the second power reception apparatus, the control unit causes the power transmission circuit to perform power transmission to the second power reception apparatus in accordance with the result of negotiation with the second power reception apparatus, and where it is determined not to perform the negotiation with the second power reception apparatus, the control unit determines not to perform the negotiation with the second power reception apparatus, and thereby power transmission to the second power reception apparatus by the communication circuit is restricted.

2. The power transmission apparatus according to claim 1,

wherein, where the power reception value included in the signal received from the second power reception apparatus is a value exceeding the predetermined value, the control unit causes the power transmission circuit to perform power transmission to the second power reception apparatus according to the result of negotiation with the second power reception apparatus, and

where the power reception value included in the signal received from the second power reception apparatus is a value not exceeding the predetermined value, the control unit does not perform the negotiation to establish power transmission with the second power reception apparatus.

3. The power transmission apparatus according to claim 2, wherein the predetermined value is a value according to an amount of power transmitted to the first power reception apparatus by the power transmission circuit.

4. The power transmission apparatus according to claim 1,

wherein, where the power reception value included in the signal received from the second power reception apparatus indicates existence of the second power reception apparatus in a power transmission range of the power transmission circuit, the control unit causes the power transmission circuit to perform power transmission to the second power reception apparatus according to the result of negotiation with the second power reception apparatus, and

where the power reception value included in the signal received from the second power reception apparatus does not indicate the existence of the second power reception apparatus in the power transmission range of the power transmission circuit, the control unit does not perform the negotiation to establish power transmission with the second power reception apparatus.

5. The power transmission apparatus according to claim 1, wherein the power reception value included in the signal received from the second power reception apparatus is a power reception voltage value.

6. The power transmission apparatus according to claim 1, further comprising a detection circuit configured to detect an object existing in a predetermined range based on a change in impedance when detection power transmission by the power transmission circuit is performed,

wherein the power transmission circuit performs authentication power transmission for supplying power necessary for communication with the power transmission apparatus in a case where the detection circuit detects an object existing in the predetermined range.

7. The power transmission apparatus according to claim 1, further comprising a display control unit configured to, where the negotiation with the second power reception apparatus fails, cause a display unit to display information for prompting a user to remove an object existing in a power transmission range.

8. The power transmission apparatus according to claim 1, wherein the power transmission circuit performs the power transmission by a magnetic field resonance method, an electromagnetic induction method, an electric field resonance method, a microwave method, or a power transmission method using a laser.

9. The power transmission apparatus according to claim 1, wherein the negotiation with the second power reception apparatus is performed based on power transmittable by the power transmission apparatus and power requested by the second power reception apparatus.

10. The power transmission apparatus according to claim 1, wherein the power transmission circuit performs power transmission that triggers the second power reception apparatus to transmit the signal.

11. The power transmission apparatus according to claim 1,

wherein the power transmission circuit performs power transmission in a first level that is a level for detecting an object existing in a predetermined range and performs power transmission in a second level that is greater in power than the first level, and

wherein, where the signal is received from the second power reception apparatus during performing the power transmission in the second level to the first power reception apparatus, the control unit determines whether to perform the negotiation with the second power reception apparatus or not on a basis of the power reception value corresponding to power reception information in the signal received from the second power reception apparatus.

12. The power transmission apparatus according to claim 1,

wherein the control unit determines whether the second power reception apparatus exists in a predetermined range or not on the basis of the power reception value that is included in the signal received from the second power reception apparatus,

wherein, where it is determined that the second power reception apparatus exists in the predetermined range, the control unit determines to perform the negotiation with the second power reception apparatus, and

wherein, where it is determined that the second power reception apparatus does not exist in the predetermined range, the control unit determines not to perform the negotiation with the second power reception apparatus.

13. A method for controlling a power transmission apparatus including a power transmission circuit configured to perform power transmission, the method comprising:

performing wireless communication using a communication circuit of the power transmission apparatus;

performing power transmission to a first power reception apparatus by the power transmission circuit in accordance with a result of a negotiation to establish power transmission with the first power reception apparatus using communication by the communication circuit; and

determining, where a signal is received by the communication circuit from a second power reception apparatus that is different from the first power reception apparatus during the power transmission to the first power reception apparatus, whether to perform a negotiation to establish power transmission with the second power reception apparatus on a basis of a comparison between a predetermined value and a power reception value that is included in the signal received from the second power reception apparatus, the power reception value indicating an amount of power received by the second power reception apparatus during the power transmission to the first power reception apparatus;

wherein, where it is determined to perform the negotiation with the second power reception apparatus, performing power transmission to the second power reception apparatus by the power transmission circuit in accordance with the result of negotiation with the second power reception apparatus, and where it is determined not to perform the negotiation with the second power reception apparatus, determining not to perform the negotiation with the second power reception apparatus, and thereby power transmission to the second power reception apparatus by the communication circuit is restricted.

14. A non-transitory storage medium storing a program for causing a power transmission apparatus to perform a control method, the power transmission apparatus including a power transmission circuit configured to perform power transmission, the control method comprising:

performing wireless communication using a communication circuit of the power transmission apparatus;

performing power transmission to a first power reception apparatus by the power transmission circuit in accordance with a result of a negotiation to establish power transmission with the first power reception apparatus using communication by the communication circuit; and

determining, where a signal is received by the communication circuit from a second power reception apparatus that is different from the first power reception apparatus during the power transmission to the first power reception apparatus, whether to perform a negotiation to establish power transmission with the second power reception apparatus on a basis of a comparison between a predetermined value and a power reception value that is included in the signal received from the second power reception apparatus, the power reception value indicating an amount of power received by the second power reception apparatus during the power transmission to the first power reception apparatus;

wherein, where it is determined to perform the negotiation with the second power reception apparatus, performing power transmission to the second power reception apparatus by the power transmission circuit in accordance with the result of negotiation with the second power reception apparatus, and where it is determined not to perform the negotiation with the second power reception apparatus, determining not to perform the negotiation with the second power reception apparatus, and thereby power transmission to the second power reception apparatus by the communication circuit is restricted.