METHOD FOR DRIVING POWER SUPPLY SYSTEM

• US 20120223592A1
• Filed: 02/06/2012
• Published: 09/06/2012
• Est. Priority Date: 03/04/2011
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KAMATA, Koichiro
• Granted Patent: US 9,325,205 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02G 3/0412 Heat or fire protective means for fire in electric circuits A62C3/16
• CPC Class Codes: H02G 3/22 Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

The frequency of high-frequency voltage which is output by a variable high frequency power source included in a power transmitting device is controlled in accordance with the value of electric power received by a power receiving device. That is to say, the frequency of the high-frequency voltage is controlled in accordance with data directly relating to power supply. Thus, electric power is accurately supplied with high transmission efficiency in the power supply system.

Claims

1. A method for driving a power supply system comprising:

detecting a first value of electric power received by a power receiving device in a state where a power source in a power transmitting device outputs a high-frequency voltage with a first frequency, the first value of electric power being received by a magnetic resonance method;

detecting a second value of electric power received by the power receiving device in a state where the power source outputs the high-frequency voltage with a second frequency higher than the first frequency, the second value of electric power being received by the magnetic resonance method; and

setting a frequency of the high-frequency voltage to be output by the power source to the first frequency when the first value of electric power is larger than or equal to the second value of electric power, and to the second frequency when the first value of electric power is smaller than the second value of electric power.

2. The method for driving the power supply system according to claim 1,

wherein the detecting the first value of electric power is performed in the power transmitting device.

3. The method for driving the power supply system according to claim 1,

wherein the detecting the second value of electric power is performed in the power transmitting device.

4. The method for driving the power supply system according to claim 1,

wherein supply of electric power from the power transmitting device to the power receiving device and transmission and reception of a signal between the power transmitting device and the power receiving device are performed through a resonance coil included in the power transmitting device and a resonance coil included in the power receiving device.

5. The method for driving the power supply system according to claim 1,

wherein the detecting the second value of electric power is performed after the detecting the first value of electric power is performed,

wherein the detecting the first value of electric power, the detecting the second value of electric power, and setting the frequency of the high-frequency voltage to be output by the power source are repeatedly performed with the frequency of the high-frequency voltage to be output by the power source being the first frequency, until the first value of electric power becomes larger than or equal to the second value of electric power, so that the first and the second frequency are increased in a step-by-step manner, and

wherein the first frequency at the time when the first value of electric power is larger than or equal to the second value of electric power is held for a certain period as an optimal frequency.

6. The method for driving the power supply system according to claim 5,

wherein a sensor is provided in the power supply system, and

wherein the certain period is terminated when the sensor detects a change of a power supply environment.

7. The method for driving the power supply system according to claim 5,

wherein a value of electric power in a temporal frequency which is set in the setting the frequency of the high-frequency voltage to be output by the power source step performed plural times is held until at least the setting the frequency of the high-frequency voltage to be output by the power source step performed next time, so that the detecting the first value of electric power is not performed in subsequent times.

8. The method for driving the power supply system according to claim 1,

wherein the detecting the first value of electric power is performed after the detecting the second value of electric power is performed,

wherein the detecting the first value of electric power, the detecting the second value of electric power, and setting the frequency of the high-frequency voltage to be output by the power source are repeatedly performed with the frequency of the high-frequency voltage to be output by the power source being the second frequency, until the first value of electric power becomes smaller than the second value of electric power, so that the first frequency and the second frequency are decreased in a step-by-step manner, and

wherein the second frequency at the time when the first value of electric power is smaller than the second value of electric power is held for a certain period as an optimal frequency.

9. The method for driving the power supply system according to, claim 8,

wherein a sensor is provided in the power supply system, and

wherein the certain period is terminated when the sensor detects a change of a power supply environment.

10. The method for driving the power supply system according to claim 8,

wherein a value of electric power in a temporal frequency which is set in the setting the frequency of the high-frequency voltage to be output by the power source step performed plural times is held until at least the setting the frequency of the high-frequency voltage to be output by the power source step performed next time, so that the detecting the second value of electric power is not performed in subsequent times.

11. A method for driving a power supply system comprising:

detecting a first value of electric power received by a power receiving device in a state where a power source in a power transmitting device outputs a high-frequency voltage with a first frequency, the first value of electric power being received by a magnetic resonance method;

detecting a second value of electric power received by the power receiving device in a state where the power source outputs the high-frequency voltage with a second frequency higher than the first frequency, the second value of electric power being received by the magnetic resonance method; and

setting a frequency of the high-frequency voltage to be output by the power source to the first frequency when the first value of electric power is larger than the second value of electric power, and to the second frequency when the first value of electric power is smaller than or equal to the second value of electric power.

12. The method for driving the power supply system according to claim 11,

wherein the detecting the first value of electric power is performed in the power transmitting device.

13. The method for driving the power supply system according to claim 11,

wherein the detecting the second value of electric power is performed in the power transmitting device.

14. The method for driving the power supply system according to claim 11,

wherein supply of electric power from the power transmitting device to the power receiving device and transmission and reception of a signal between the power transmitting device and the power receiving device are performed through a resonance coil included in the power transmitting device and a resonance coil included in the power receiving device.

15. The method for driving the power supply system according to claim 11,

wherein the detecting the second value of electric power is performed after the detecting the first value of electric power is performed,

wherein the detecting the first value of electric power, the detecting the second value of electric power, and setting the frequency of the high-frequency voltage to be output by the power source are repeatedly performed with the frequency of the high-frequency voltage to be output by the power source being the first frequency, until the first value of electric power becomes larger than the second value of electric power, so that the first frequency and the second frequency are increased in a step-by-step manner, and

wherein the first frequency at the time when the first value of electric power is larger than the second value of electric power is held for a certain period as an optimal frequency.

16. The method for driving the power supply system according to claim 15,

wherein a sensor is provided in the power supply system, and

wherein the certain period is terminated when the sensor detects a change of a power supply environment.

17. The method for driving the power supply system according to claim 15,

wherein a value of electric power in a temporal frequency which is set in the setting the frequency of the high-frequency voltage to be output by the power source step performed plural times is held until at least the setting the frequency of the high-frequency voltage to be output by the power source step performed next time, so that the detecting the first value of electric power is not performed in subsequent times.

18. The method for driving the power supply system according to claim 11,

wherein the detecting the first value of electric power is performed after the detecting the second value of electric power is performed,

wherein the detecting the first value of electric power, the detecting the second value of electric power, and setting the frequency of the high-frequency voltage to be output by the power source are repeatedly performed with the frequency of the high-frequency voltage to be output by the power source being the second frequency, until the first value of electric power becomes smaller than or equal to the second value of electric power, so that the first frequency and the second frequency are decreased in a step-by-step manner, and

wherein the second frequency at the time when the first value of electric power is smaller than or equal to the second value of electric power is held for a certain period as an optimal frequency.

19. The method for driving the power supply system according to claim 18,

wherein a sensor is provided in the power supply system, and

wherein the certain period is terminated when the sensor detects a change of a power supply environment.

20. The method for driving the power supply system according to claim 18,

wherein a value of electric power in a temporal frequency which is set in the setting the frequency of the high-frequency voltage to be output by the power source step performed plural times is held until at least the setting the frequency of the high-frequency voltage to be output by the power source step performed next time, so that the detecting the second value of electric power is not performed in subsequent times.