Power receiving unit, power transmission unit, and feed system

• US 9,525,292 B2
• Filed: 09/11/2014
• Issued: 12/20/2016
• Est. Priority Date: 10/10/2013
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Washiro, Takanori, Yajima, Masakazu, Kikuchi, Kazuo, Hirabayashi, Takayuki
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): PEREZ BORROTO, ALFONSO
• Application Number:
  US14/483,706
• Publication Number:
  US 20150102686A1
• Time in Patent Office: 831 Days
• Field of Search: 307/104, 335/290, 439/39
• US Class Current: 1/1
• CPC Class Codes: H01F 38/00 Adaptations of transformers or inductances for specific applications or functions
• 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 50/05 using capacitive coupling
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A power receiving unit includes: a power receiving section configured to receive electric power from a power transmission unit; and an electromagnet configured to be magnetized based on the electric power received from the power transmission unit.

Claims

1. A power receiving unit comprising:

a power receiving section configured to wirelessly receive electric power;

an electromagnet configured to be magnetizable by using a part of the electric power; and

a control section configured to control current flowing to the electromagnet,

wherein the control section is configured to halt a supply of the electric power to the electromagnet when a transmission of the electric power is finished.

2. The power receiving unit according to claim 1, wherein the electromagnet is electrically connected in series between the power receiving section and a load.

3. The power receiving unit according to claim 1, wherein the power, receiving section includes an electrode that is configured to wirelessly receive the electric power, the electrode is electrically connected to a rectifier circuit.

4. The power receiving unit according to claim 3, wherein the electrode and the electromagnet are provided in proximity to a power receiving surface.

5. The power receiving unit according to claim 3, wherein an opening extends through the electrode, the electromagnet is in the opening.

6. The power receiving unit according to claim 3, wherein a layout of the electrode, the electrode surrounds the electromagnet.

7. The power receiving unit according to claim 1, wherein the control section is configured to control a flow of current to the electromagnet.

8. The power receiving unit according to claim 1, further comprising:

a piezoelectric transformer configured to convert an input voltage into a reduced voltage, the reduced voltage is lower than the input voltage.

9. The power receiving unit according to claim 8, wherein the reduced voltage is one several tenth of the input voltage.

10. The power receiving unit according to claim 8, further comprising:

a rectifier circuit configured to convert the input voltage into a DC voltage, the input voltage is an AC voltage.

11. A feed system comprising:

a power transmission section configured to wirelessly output the electric power to the power receiving section of claim 1.

12. The feed system according to claim 11, wherein the power transmission unit is installed on a wall surface.

13. The feed system according to claim 11, further comprising:

a fixing section configured to attracts the electromagnet.

14. The feed system according to claim 13, wherein the fixing section includes a material from the group consisting of iron, nickel, and cobalt.