Electric power charge and discharge system

• US 10,658,877 B2
• Filed: 11/27/2017
• Issued: 05/19/2020
• Est. Priority Date: 10/31/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Nagatsuka, Shuhei, Kimura, Akihiro
• Primary Examiner(s): Fantu, Yalkew
• Application Number:
  US15/822,483
• Publication Number:
  US 20180090976A1
• Time in Patent Office: 904 Days
• Field of Search: 320109
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/27 characterised by the type of receiving antennas, e.g. rectennas
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0025 Sequential battery discharge in systems with a plurality of batteries
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H04B 1/3883 Arrangements for mounting batteries or battery chargers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electric power charge and discharge system for an electronic device having a battery, by which the electronic device can be used for a long period of time. In a wireless communication device including a wireless driving portion including a first battery and a wireless charging portion including a second battery, the first battery is charged by electric power from a fixed power supply and the second battery is charged by using electromagnetic waves existing in an external space. Further, the first battery and the second battery are discharged alternately, and during a period in which the first battery is discharged, the second battery is charged.

Claims

1. An electronic device comprising:

a first antenna;

a second antenna;

a connector;

a first battery; and

a charge switching circuit configured to switch an electric power supply to the first battery from between the first antenna and the connector,

wherein the first battery is configured to be charged by the first antenna unless the first battery is charged by an external power supply via the connector.

2. The electronic device according to claim 1, comprising a second battery configured to be charged by the external power supply via the connector.

3. The electronic device according to claim 1, comprising a charge controlling circuit electrically connected to the connector and configured to convert an AC signal into a DC signal.

4. The electronic device according to claim 1, comprising an inner circuit configured to demodulate a wireless communication signal received by the second antenna.

5. The electronic device according to claim 1, wherein the first battery is a lithium ion battery.

6. An electronic device comprising:

a first antenna;

a second antenna;

a wireless charge controlling circuit electrically connected to the first antenna;

a connector;

a first battery; and

a charge switching circuit configured to switch an electric power supply to the first battery from between the first antenna and the connector,

wherein the first battery is configured to be charged by the first antenna unless the first battery is charged by an external power supply via the connector.

7. The electronic device according to claim 6, comprising a second battery configured to be charged by the external power supply via the connector.

8. The electronic device according to claim 6, comprising a charge controlling circuit electrically connected to the connector and configured to convert an AC signal into a DC signal.

9. The electronic device according to claim 6, comprising an inner circuit configured to demodulate a wireless communication signal received by the second antenna.

10. The electronic device according to claim 6, wherein the first battery is a lithium ion battery.

11. A charging method for an electronic device, comprising:

charging a first battery by an antenna, wherein the charging the first battery by the antenna is stopped when the first battery is charged by an external power supply via a connector.

12. The charging method for an electronic device according to claim 11, wherein the first battery is charged by the antenna receiving an external electromagnetic wave.