POWER TRANSMISSION APPARATUS, POWER TRANSMISSION DEVICE, POWER RECEPTION DEVICE, AND POWER TRANSMISSION METHOD

• US 20130099586A1
• Filed: 10/11/2012
• Published: 04/25/2013
• Est. Priority Date: 10/19/2011
• Status: Active Grant

• Current Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Kato, Masakazu
• Granted Patent: US 9,106,096 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• 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: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A power transmission apparatus includes a power transmission device having a power transmission amount detecting unit that transmits power and detects a power transmission amount, a power transmission device communication unit that communicates with a power reception device, and a power transmission device controller that calculates power transmission efficiency from the power transmission amount and a power reception amount and stops transmitting power if it is determined that a relationship between the power transmission amount and the power transmission efficiency lies out of an operable region, and the power reception device having a power reception amount detecting unit that receives power from the power transmission device and detects the power reception amount, a power reception device communication unit that communicates with the power transmission device, and a power reception device controller that transmits the power reception amount to the power transmission device via the power reception device communication unit.

Claims

1. A power transmission apparatus comprising:

a power transmission device including a power transmission unit that transmits power, a power transmission amount detecting unit that detects a power transmission amount transmitted by the power transmission unit, a power transmission device communication unit that performs communication, and

a power transmission device controller that controls power transmission of the power transmission unit on the basis of power transmission efficiency calculated from the power transmission amount and a power reception amount; and

a power reception device including a power reception unit that receives power, a power reception amount detecting unit that detects the power reception amount from output power of the power reception unit, a power reception device communication unit that communicates with the power transmission device communication unit, and a power reception device controller that transmits the power reception amount to the power transmission device via the power reception device communication unit.

2. The apparatus according to claim 1, wherein the power transmission device controller stops transmitting power if it is determined that a relationship between the power transmission, amount and the power transmission efficiency causes a power transmission loss exceeding a threshold value.

3. The apparatus according to claim 1, wherein the power reception device further includes

a dummy load of which a load resistance value varies;

and

a switch that changes an output from the power reception unit to either a load or the dummy load, and

wherein the power transmission device controller stops transmitting power and makes the power reception device controller vary a resistance value of the dummy load so as to transmit the power reception amount to the power transmission device if it is determined that a relationship between the power transmission amount and the power transmission efficiency causes a power transmission loss exceeding a threshold value.

4. The apparatus according to claim 1, wherein the power reception device further includes a power consumption changing unit that varies power consumption of a load, and

wherein the power transmission device controller makes the power consumption changing unit vary the power consumption of the load so as to transmit the power reception amount if a relationship between the power transmission amount and the power transmission efficiency causes a power transmission loss exceeding a threshold value.

5. The apparatus according to claim 1, wherein the power transmission device further includes a placed position correction display unit on a surface on which the power reception device is placed, and

wherein the power transmission device controller lights the placed position correction display unit if it is determined that a relationship between the power transmission amount and the power transmission efficiency causes a power transmission loss exceeding a threshold value.

6. The apparatus according to claim 1, wherein the power transmission device further includes a display unit, and

wherein the power transmission device controller displays the power transmission amount on the display unit.

7. The apparatus according to claim 1, wherein the power reception device further includes a display unit, and

wherein the power transmission device controller displays the power transmission amount on the display unit.

8. The apparatus according to claim 1, wherein the power transmission device further includes a speaker that utters a sound, and

wherein the power transmission device controller makes the speaker utter the sound if it is determined that a relationship between the power transmission amount and the power transmission efficiency causes a power transmission loss exceeding a threshold value.

9. A power transmission device comprising:

a power transmission unit that transmits power to a power reception device which is a power supply target;

a power transmission amount detecting unit that detects a power transmission amount transmitted by the power transmission unit;

a power transmission device communication unit that communicates with the power reception device; and

a power transmission device controller that controls power transmission of the power transmission unit on the basis of power transmission efficiency calculated from the power transmission amount and a power reception amount which is input from the power transmission device communication unit and is detected by the power reception device.

10. A power reception device comprising:

a power reception unit that receives power from a power transmission device which is a power supply device;

a load to which the power received by the power reception unit is input;

a power reception amount detecting unit that detects a power reception amount from output power of the power reception unit;

a power reception device communication unit that communicates with the power transmission device; and

a power reception device controller that calculates power transmission efficiency on the basis of a power transmission amount transmitted by the power transmission device and the power reception amount and transmits the power reception amount used to control power transmission.