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

Patent metadata

Field	Value
Publication number	US-9985464-B2
Application number	US-201715477332-A
Country	US
Kind code	B2
Filing date	Apr 3, 2017
Priority date	Aug 31, 2006
Publication date	May 29, 2018
Grant date	May 29, 2018

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.

First claim

What is claimed is:

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.

Assignees

• Semiconductor Energy Lab

Inventors

• Osada Takeshi

Classifications

• H02J7/94

  in response to battery current · CPC title

• H02J7/92

  with prioritisation of loads or sources · CPC title

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title