POWER TRANSMITTING APPARATUS

• US 20160352154A1
• Filed: 08/15/2016
• Published: 12/01/2016
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Matsui, Kiyoto, SHIMOKAWA, SATOSHI
• Granted Patent: US 10,454,311 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H04B 5/0037 for power transfer
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A power transmitting apparatus includes a plurality of primary-side resonant coils disposed along a conveyance path of a plurality of electronic devices and configured to utilize magnetic field resonance to transmit electric power to secondary-side resonant coils of the respective electronic devices conveyed along the conveyance path; and a plurality of phase adjusters connected between an alternating-current source and the respective primary-side resonant coils and configured to respectively adjust phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source, so as to uniform the phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source.

Claims

1. A power transmitting apparatus comprising:

a plurality of primary-side resonant coils disposed along a conveyance path of a plurality of electronic devices and configured to utilize magnetic field resonance to transmit electric power to secondary-side resonant coils of the respective electronic devices conveyed along the conveyance path; and

a plurality of phase adjusters connected between an alternating-current source and the respective primary-side resonant coils and configured to respectively adjust phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source, so as to make uniform the phases of the electric power, supplied to the primary-side resonant coils from the alternating-current source.

2. The power transmitting apparatus according to claim 1, wherein the plurality of phase adjusters are respectively a plurality of phase adjusting circuits connected between the alternating-current source and the plurality of primary-side resonant coils.

3. The power transmitting apparatus according to claim 1, wherein the plurality of phase adjusters are a plurality of transmission channels where transmission distances of the electric power between the alternating-current source and the respective primary-side resonant coils are adjusted so as to make uniform the phases of the electric power supplied to the primary-side resonant coils from the alternating-current source.

4. The power transmitting apparatus according to claim 1, further comprising:

a position detector configured to detect positions of the plurality of electronic devices, relative to the plurality of primary-side resonant coils, conveyed on the conveyance path;

a plurality of amplifiers connected between the alternating-current source and the respective primary-side resonant coils and configured to amplify the electric power supplied to the respective primary-side resonant coils from the alternating-current source; and

a controller configured to adjust amplification degrees of the electric power in the plurality of amplifiers based on the positions of the plurality of electronic devices detected by the position detector.

5. The power transmitting apparatus according to claim 4, wherein the controller increases the amplification degrees of the electric power in the plurality of amplifiers as a position gap between the plurality of electronic devices and the plurality of the primary-side resonant coils increases.

6. The power transmitting apparatus according to claim 4, further comprising:

a passing detector configured to detect passing of the plurality electronic devices conveyed along the conveyance path,

wherein, when the controller determines, based on a detection result of the passing detector, that one electronic device corresponding to one primary-side resonant coil of the plurality of primary-side resonant coils is not present, the controller decreases amplification degrees of a pair of amplifiers corresponding to a pair of primary-side resonant coils located before and after the one primary-side resonant coil corresponding to the one electronic device that is not present in the conveyance path.

7. The power transmitting apparatus according to claim 6, wherein the controller adjusts the amplification degrees of the pair of amplifiers corresponding to the pair of primary-side resonant coils located before and after the one primary-side resonant coil corresponding to the one electronic device that is not present in the conveyance path based on the positions of the plurality of electronic devices detected by the position detector.

8. The power transmitting apparatus according to claim 6, wherein the amplification degrees of the pair of amplifiers corresponding to the pair of primary-side resonant coils are different from each other.

9. The power transmitting apparatus according to claim 1, further comprising:

a plurality of primary-side coils connected to the alternating-current source and configured to utilize electromagnetic induction to respectively supply the electric power to the primary-side resonant coils supplied from the alternating-current source.

10. The power transmitting apparatus according to claim 4, wherein the controller increases an amplification degree of the electric power in one of the plurality of amplifiers as a position gap between one of the plurality of electronic devices and one of the plurality of the primary-side resonant coils corresponding to the one of the plurality of amplifiers increases.

11. A power transmitting apparatus comprising:

a plurality of primary-side resonant coils disposed along a conveyance path of an electronic device and configured to utilize magnetic field resonance to transmit electric power to a secondary-side resonant coil of the electronic device conveyed along the conveyance path; and

a plurality of phase adjusters connected between an alternating-current source and the primary-side resonant coil and configured to adjust a phase of the electric power, supplied to the primary-side resonant coil from the alternating-current source, so as to make uniform the phase of the electric power, supplied to the primary-side resonant coil from the alternating-current source.