WIRELESS POWER RECEIVING APPARATUS

• US 20120056486A1
• Filed: 08/25/2011
• Published: 03/08/2012
• Est. Priority Date: 09/02/2010
• Status: Active Grant

• Current Assignee: Advantest Corporation
• Original Assignee: Advantest Corporation
• Inventors: Endo, Yuki, Furukawa, Yasuo
• Granted Patent: US 9,071,063 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

In a wireless power supply system, a first capacitor is arranged in series with an antenna. A second capacitor and a switch are arranged in series on a path arranged in parallel with the first capacitor. A control unit adjusts the duty ratio of the switch according to the frequency of an electric power signal.

Claims

1. A wireless power receiving apparatus configured to receive an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, transmitted from a wireless power supply apparatus, the wireless power receiving apparatus comprising:

a reception coil configured to receive the electric power signal;

a first capacitor arranged in series with the reception coil;

a switch and a second capacitor arranged in series on a path arranged in parallel with the first capacitor; and

a control unit configured to control an on/off operation of the switch, with a duty ratio that corresponds to the frequency of the electric power signal.

2. A wireless power receiving apparatus according to claim 1, wherein the control unit is configured to control the switch in synchronization with a current that flows through the reception coil.

3. A wireless power receiving apparatus according to claim 1, wherein the control unit is configured to control the switch such that the amplitude of the current that flows through the reception coil becomes its maximum value in an on period of the switch.

4. A wireless power receiving apparatus according to claim 1, further comprising a third capacitor arranged in series with the reception coil and the first capacitor.

21. A wireless power supply system comprising:

a wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and

a wireless power receiving apparatus according to claim 1, configured to receive the electric power signal.

5. A wireless power receiving apparatus configured to receive an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, transmitted from a wireless power supply apparatus, the wireless power receiving apparatus comprising:

a reception coil configured to receive the electric power signal;

an auxiliary coil and a capacitor arranged in series with the reception coil;

a switch arranged in parallel with the auxiliary coil; and

a control unit configured to control an on/off operation of the switch, with a duty ratio that corresponds to the frequency of the electric power signal.

6. A wireless power receiving apparatus according to claim 5, wherein the control unit is configured to control the switch in synchronization with a current that flows through the reception coil.

7. A wireless power receiving apparatus according to claim 5, wherein the control unit is configured to control the switch such that the amplitude of a current that flows through the reception coil becomes its maximum value in an on period of the switch.

22. A wireless power supply system comprising:

a wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and

a wireless power receiving apparatus according to claim 5, configured to receive the electric power signal.

8. A wireless power receiving apparatus configured to receive an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, transmitted from a wireless power supply apparatus, the wireless power receiving apparatus comprising:

a reception coil configured to receive the electric power signal;

a first auxiliary coil and a first capacitor arranged in series with the reception coil;

a second auxiliary coil configured such that it shares a common core with the first auxiliary coil;

a second capacitor and a third capacitor arranged in series such that they and the second auxiliary coil form a closed loop;

a switch arranged in parallel with the third capacitor; and

a control unit configured to control an on/off operation of the switch, with a duty ratio that corresponds to the frequency of the electric power signal.

9. A wireless power receiving apparatus according to claim 8, wherein the control unit is configured to control the switch in synchronization with a current that flows through the reception coil.

10. A wireless power receiving apparatus according to claim 8, wherein the control unit is configured to control the switch such that the amplitude a current that flows through the reception coil becomes its maximum value in an on period of the switch.

23. A wireless power supply system comprising:

a wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and

a wireless power receiving apparatus according to claim 8, configured to receive the electric power signal.

11. A wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, the wireless power supply apparatus comprising:

a transmission coil configured to transmit the electric power signal;

a first capacitor arranged in series with the transmission coil;

a switch and a second capacitor arranged in series on a path arranged in parallel with the first capacitor; and

a control unit configured to perform an on/off operation of the switch, with a duty ratio that corresponds to the frequency of the electric power signal.

12. A wireless power supply apparatus according to claim 11, wherein the control unit is configured to control the switch in synchronization with a current that flows through the transmission coil.

13. A wireless power supply apparatus according to claim 11, wherein the control unit is configured to control the switch such that the amplitude of a current that flows through the transmission coil becomes its maximum value in an on period of the switch.

14. A wireless power supply apparatus according to claim 11, further comprising a third capacitor arranged in series with the transmission coil and the first capacitor.

24. A wireless power supply system comprising:

a wireless power supply apparatus according to claim 11, configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and

a wireless power receiving apparatus configured to receive the electric power signal.

15. A wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, the wireless power supply apparatus comprising:

a transmission coil configured to transmit the electric power signal;

an auxiliary coil and a capacitor arranged in series with the transmission coil;

a switch arranged in parallel with the auxiliary coil; and

a control unit configured to control an on/off operation of the switch, with a duty ratio that corresponds to the frequency of the electric power signal.

16. A wireless power supply apparatus according to claim 15, wherein the control unit is configured to control the switch in synchronization with a current that flows through the transmission coil.

17. A wireless power supply apparatus according to claim 15, wherein the control unit is configured to control the switch such that the amplitude of a current that flows through the transmission coil becomes its maximum value in an on period of the switch.

25. A wireless power supply system comprising:

a wireless power supply apparatus according to claim 15, configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and

a wireless power receiving apparatus configured to receive the electric power signal.

18. A wireless power supply apparatus configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, the wireless power supply apparatus comprising:

a transmission coil configured to transmit the electric power signal;

a first auxiliary coil and a first capacitor arranged in series with the transmission coil;

a second auxiliary coil configured such that it shares a common core with the first auxiliary coil;

a second capacitor and a third capacitor arranged in series such that they and the second auxiliary coil form a closed loop;

a switch arranged in parallel with the third capacitor; and

a control unit configured to control an on/off operation of the switch, with a duty ratio that corresponds to the frequency of the electric power signal.

19. A wireless power supply apparatus according to claim 18, wherein the control unit is configured to control the switch in synchronization with a current that flows through the transmission coil.

20. A wireless power supply apparatus according to claim 18, wherein the control unit is configured to control the switch such that the amplitude of a current that flows through the transmission coil becomes its maximum value in an on period of the switch.

26. A wireless power supply system comprising:

a wireless power supply apparatus according to claim 18, configured to transmit an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field; and

a wireless power receiving apparatus configured to receive the electric power signal.