ELECTRONIC UNIT AND POWER FEEDING SYSTEM

• US 20140333259A1
• Filed: 12/13/2012
• Published: 11/13/2014
• Est. Priority Date: 01/27/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Akiyoshi, Koichi, Uramoto, Yoichi
• Granted Patent: US 9,722,451 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H02J 50/05 using capacitive 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 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electronic unit includes: an electricity reception section configured to receive power transmitted using one of a magnetic field and an electric field; a secondary battery; a charging section configured to charge the secondary battery based on incoming power received by the electricity reception section; a load configured to perform predetermined operation based on supplied power; a first power supply path running from one of a side of the electricity reception section and a side of the secondary battery to a side of the load via the charging section; and a second power supply path running from the electricity reception section side to the load side around the charging section.

Claims

1. An electronic unit, comprising:

an electricity reception section configured to receive power transmitted using one of a magnetic field and an electric field;

a secondary battery;

a charging section configured to charge the secondary battery based on incoming power received by the electricity reception section;

a load configured to perform predetermined operation based on supplied power;

a first power supply path running from one of a side of the electricity reception section and a side of the secondary battery to a side of the load via the charging section; and

a second power supply path running from the electricity reception section side to the load side around the charging section.

2. The electronic unit according to claim 1, wherein the first and second power supply paths each have a rectifier element.

3. The electronic unit according to claim 2, wherein the first power supply path further has a transistor connected in parallel to the rectifier element.

4. The electronic unit according to claim 3, wherein on the first power supply path, when the incoming power is supplied to the load, the transistor is turned off, and the rectifier element is turned on.

5. The electronic unit according to claim 3, wherein on the first power supply path, when the incoming power is not supplied to the load, and when part of charged power stored in the secondary battery is supplied to the load to start the load, the transistor is turned on, and the rectifier element is turned off.

6. The electronic unit according to claim 2, wherein the rectifier element is disposed in a direction along which power is supplied to the load side.

7. The electronic unit according to claim 1, wherein the second power supply path is valid when the charging section is in a UVLO (Under Voltage Lock Out) mode.

8. The electronic unit according to claim 7, wherein when the charging section is in the UVLO mode, supply of the incoming power to the load through the first power supply path is suspended.

9. The electronic unit according to claim 8, wherein when the charging section is in the UVLO mode, the incoming power is supplied to the load through the second power supply path, and

part of charged power stored in the secondary battery is supplied to the load through the first power supply path.

10. The electronic unit according to claim 1, wherein the first and second power supply paths are provided in the charging section.

11. A power feeding system, comprising:

one or more electronic units; and

a power feeding unit configured to perform power transmission using one of a magnetic field and an electric field to each of the electronic units,

wherein the electronic unit includes

an electricity reception section configured to receive power transmitted from the power feeding unit,

a secondary battery,

a charging section configured to charge the secondary battery based on incoming power received by the electricity reception section,

a load configured to perform predetermined operation based on supplied power,

a first power supply path running from one of a side of the electricity reception section and a side of the secondary battery to a side of the load via the charging section, and

a second power supply path running from the electricity reception section side to the load side around the charging section.