Power storage device and semiconductor device provided with the power storage device

• US 9,985,464 B2
• Filed: 04/03/2017
• Issued: 05/29/2018
• Est. Priority Date: 08/31/2006
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Osada, Takeshi
• Primary Examiner(s): Diao, M'Baye
• Application Number:
  US15/477,332
• Publication Number:
  US 20170214270A1
• Time in Patent Office: 421 Days
• Field of Search: 320108
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/23 characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas
• 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 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H03D 9/00 Demodulation or transference of modulation of modulated electromagnetic waves demodulating light, transferring modulation in light waves G02F2/00
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An object is to provide a power storage device provided with a battery that is a power storage means, for safe and accurate supply of electric power in a short period of time for drive power supply voltage without checking remaining capacity of the battery or changing batteries with deterioration over time of the battery for drive power supply voltage. The power storage device is provided with a battery that is a power storage means as a power supply for supplying electric power and a counter circuit for counting charging time of the power storage means. An electromagnetic wave with electric field intensity, magnetic field intensity, and power flux density per unit time which are transmitted from a power feeder are controlled, and the power storage means is efficiently charged using the electromagnetic wave in a short period of time.

Claims

1. A method for charging a power storage device through electromagnetic wave, comprising steps of:

supplying electromagnetic wave from a power feeder to an antenna of a power storage device;

in a period in which the power storage device is charged, transmitting a signal for informing the power feeder side from the power storage device whether the power feeder and the power storage device are in a charging state;

stopping the signal from the power storage device when a determination circuit of the power storage device determines that charging is completed; and

stopping electromagnetic wave supplied by the power feeder when the signal from the power storage device is stopped.

2. The method for charging a power storage device through electromagnetic wave according to claim 1, further comprising steps of:

transmitting a charging starting signal from the power feeder to the power storage device; and

in the power storage device, being switched from a non-charging state to the charging state when the power storage device receives the charging starting signal.

3. The method for charging a power storage device through electromagnetic wave according to claim 2, further comprising a step of:

in the power storage device, being switched from the charging state to the non-charging state when electromagnetic wave supplied by the power feeder is stopped.

4. The method for charging a power storage device through electromagnetic wave according to claim 1,

wherein a counter circuit of the power storage device counts the period.

5. The method for charging a power storage device through electromagnetic wave according to claim 4,

wherein the determination circuit of the power storage device monitors voltage of the power storage device in the counting period.

6. A method for charging a power storage device through electromagnetic wave, comprising steps of:

supplying electromagnetic wave from a power feeder to an antenna of a power storage device;

in a period in which the power storage device is charged, regularly transmitting a signal for informing the power feeder side from the power storage device whether the power feeder and the power storage device are in a charging state;

stopping the signal from the power storage device when a determination circuit of the power storage device determines that charging is completed; and

stopping electromagnetic wave supplied by the power feeder when the signal from the power storage device is stopped.

7. The method for charging a power storage device through electromagnetic wave according to claim 6, further comprising steps of:

transmitting a charging starting signal from the power feeder to the power storage device; and

in the power storage device, being switched from a non-charging state to the charging state when the power storage device receives the charging starting signal.

8. The method for charging a power storage device through electromagnetic wave according to claim 7, further comprising a step of:

in the power storage device, being switched from the charging state to the non-charging state when electromagnetic wave supplied by the power feeder is stopped.

9. The method for charging a power storage device through electromagnetic wave according to claim 6,

wherein a counter circuit of the power storage device counts the period.

10. The method for charging a power storage device through electromagnetic wave according to claim 9,

wherein the determination circuit of the power storage device monitors voltage of the power storage device in the counting period.

11. A method for charging a power storage device through electromagnetic wave, comprising steps of:

supplying electromagnetic wave from a power feeder to an antenna of a power storage device;

in a period in which the power storage device is charged, transmitting a signal for informing the power feeder side from the power storage device whether the power feeder and the power storage device are in a wireless charging state;

stopping the signal from the power storage device when a determination circuit of the power storage device determines that charging is completed; and

stopping electromagnetic wave supplied by the power feeder when the signal from the power storage device is stopped.

12. The method for charging a power storage device through electromagnetic wave according to claim 11, further comprising steps of:

transmitting a charging starting signal from the power feeder to the power storage device; and

in the power storage device, being switched from a non-charging state to the wireless charging state when the power storage device receives the charging starting signal.

13. The method for charging a power storage device through electromagnetic wave according to claim 12, further comprising a step of:

in the power storage device, being switched from the wireless charging state to the non-charging state when electromagnetic wave supplied by the power feeder is stopped.

14. The method for charging a power storage device through electromagnetic wave according to claim 11,

wherein a counter circuit of the power storage device counts the period.

15. The method for charging a power storage device through electromagnetic wave according to claim 14,

wherein the determination circuit of the power storage device monitors voltage of the power storage device in the counting period.