Electric power charge and discharge system

• US 8,674,655 B2
• Filed: 11/03/2011
• Issued: 03/18/2014
• 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:
  US13/288,316
• Publication Number:
  US 20120043933A1
• Time in Patent Office: 866 Days
• Field of Search: 320/108
• US Class Current: 320/108
• 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. A wireless communication device comprising:

an electrical device comprising;

a connector;

a battery electrically connected to the connector;

an inner circuit electrically connected to the battery; and

a wireless charge controlling circuit electrically connected to the battery and the connector,

wherein an antenna is attachable to and detachable from the connector,

wherein the wireless charge controlling circuit is configured to transform a wireless electric power received by the antenna into a voltage capable of charging the battery,

wherein the battery is configured to be charged by electric power from the antenna in a first state, and

wherein the battery is configured to be charged by electric power from an external power supply source through a cable in a second state.

2. The wireless communication device according to claim 1, wherein the connector is a communication connector electrically connected to the inner circuit.

3. The wireless communication device according to claim 1, wherein the wireless charge controlling circuit comprises a rectifier circuit, a constant voltage circuit, a booster circuit, and a diode.

4. The wireless communication device according to claim 1, wherein the battery is a lithium ion battery.

5. The wireless communication device according to claim 1, wherein the battery is a double-layer electrolytic capacitor.

6. A wireless communication device comprising:

an electrical device comprising;

a first connector;

a second connector;

a battery electrically connected to the first connector and the second connector;

an inner circuit electrically connected to the battery; and

a wireless charge controlling circuit electrically connected to the battery and the first connector,

wherein an antenna is attachable to and detachable from the first connector,

wherein the wireless charge controlling circuit is configured to transform a wireless electric power received by the antenna into a voltage capable of charging the battery,

wherein the battery is configured to be charged by a first electric power from the antenna in a first state, and

wherein the battery is configured to be charged by a second electric power from an external power supply source through the second connector and a cable in a second state.

7. The wireless communication device according to claim 6, wherein the first connector is a communication connector electrically connected to the inner circuit.

8. The wireless communication device according to claim 6, wherein the electrical device further comprises a charge switching circuit electrically connected to the battery and the second connector.

9. The wireless communication device according to claim 6, wherein the wireless charge controlling circuit comprises a rectifier circuit, a constant voltage circuit, a booster circuit, and a diode.

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

11. The wireless communication device according to claim 6, wherein the battery is a double-layer electrolytic capacitor.

12. A wireless communication device comprising:

an electrical device comprising;

a connector;

a battery electrically connected to the connector; and

a wireless charge controlling circuit electrically connected to the battery and the connector,

wherein an antenna is attachable to and detachable from the connector,

wherein the wireless charge controlling circuit is configured to transform a wireless electric power received by the antenna into a voltage capable of charging the battery,

wherein the battery is configured to be charged by electric power from the antenna in a first state, and

wherein the battery is configured to be charged by electric power from an external power supply source through a cable in a second state.

13. The wireless communication device according to claim 12, wherein the wireless charge controlling circuit comprises a rectifier circuit, a constant voltage circuit, a booster circuit, and a diode.

14. The wireless communication device according to claim 12, wherein the battery is a lithium ion battery.

15. The wireless communication device according to claim 12, wherein the battery is a double-layer electrolytic capacitor.