Portable electronic apparatus, and battery charging system comprising an antenna arrangement for a radio receiver

• US 7,990,103 B2
• Filed: 11/24/2008
• Issued: 08/02/2011
• Est. Priority Date: 11/24/2008
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications USA Incorporated (Sony Group Corp.)
• Inventors: Klinghult, Gunnar
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): Hernandez; Manuel
• Application Number:
  US12/276,500
• Publication Number:
  US 20100127659A1
• Time in Patent Office: 981 Days
• Field of Search: 320/108, 343/850
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/23 characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas

Abstract

A charging system for a portable electronic device is disclosed. The system comprises a charging station providing a magnetic field for power distribution by an alternating current source connected to a power transmission coil for providing the magnetic field, and the portable electronic device. The portable electronic device comprises a radio receiver; a charging mechanism for charging a battery of the portable electronic device; and an antenna arrangement for the radio receiver, wherein the charging mechanism comprises a first coil arranged to interact with the power transmission coil of the charging station upon charging; a rectifier connected to the first coil to receive an alternating current therefrom and to a power supply output to provide a direct current, and the antenna arrangement comprises an antenna element comprising the first coil; a resonator tuned for a frequency band in which the radio receiver is intended to receive radio transmissions; a series resonance circuit comprising a capacitor and a second coil connected in series between one terminal of the first coil and a reference voltage of the portable apparatus.

Claims

1. A portable electronic device, comprising

a radio receiver;

a charging mechanism for charging a battery of the portable electronic device; and

an antenna arrangement for the radio receiver,

wherein the charging mechanism comprises

a first coil arranged to interact with a charging station providing a magnetic field for power distribution to the portable electronic device upon charging;

a rectifier connected to the first coil to receive an alternating current therefrom and to a power supply output to provide a direct current,

and the antenna arrangement comprises

an antenna element comprising the first coil;

a resonator tuned for a frequency band in which the receiver is intended to receive radio transmissions; and

a first series resonance circuit comprising a capacitor and a second coil connected in series between a first terminal of the first coil and a reference voltage of the portable apparatus,

wherein the resonator comprises a second series resonance circuit connected between a second terminal of the first coil and the radio receiver, and

further comprising a third resonance circuit arranged between the second terminal of the first coil and the rectifier to provide a high impedance at frequencies for radio reception and a low impedance for a frequency of the magnetic field for power distribution to the portable electronic device.

2. The portable electronic device according to claim 1, wherein the resonator comprises the first coil and a capacitor connected in parallel therewith.

3. The portable electronic device according to claim 2, further comprising a capacitor connected between the second terminal of the first coil and the radio receiver.

4. The portable electronic device according to claim 1, wherein the third resonance circuit comprises a capacitor and a coil connected in parallel and having a resonance frequency at frequencies for radio reception.

5. The portable electronic device according to claim 1, wherein the third resonance circuit comprises a capacitor and a coil connected in series and having a resonance frequency at a frequency of the magnetic field for power distribution to the portable electronic device.

6. The portable electronic device according to claim 1, wherein the power supply output comprises a capacitor electrically connected across output terminals of the power supply output.

7. The portable electronic device according to claim 1, wherein the radio receiver is arranged to receive radio transmissions within the AM band, and the magnetic field for power distribution is provided in a frequency band different from the AM band.

8. The portable electronic device according to claim 7, wherein the magnetic field for power distribution is provided in a frequency between 100 kHz and 400 kHz, preferably between 175 kHz and 300 kHz, preferably about 200 kHz.

9. The portable electronic device according to claim 7, wherein the magnetic field for power distribution is provided in a frequency between 1800 kHz and 2400 kHz, preferably between 1900 kHz and 2200 kHz, preferably about 2000 kHz.

10. The portable electronic device according to claim 1, wherein the first series resonance circuit is tuned to provide a short circuit for a frequency band in which the receiver is intended to receive radio transmissions.

11. The portable electronic device according to claim 1, wherein the reference voltage is a ground reference of the portable electronic device.

12. A charging system for a portable electronic device comprising

a charging station providing a magnetic field for power distribution by an alternating current source connected to a power transmission coil for providing the magnetic field;

and

a portable electronic device, comprising a radio receiver;

a charging mechanism for charging a battery of the portable electronic device; and

an antenna arrangement for the radio receiver, wherein the charging mechanism comprises a first coil arranged to interact with the power transmission coil of the charging station upon charging;

a rectifier connected to the first coil to receive an alternating current therefrom and to a power supply output to provide a direct current, and the antenna arrangement comprises an antenna element comprising the first coil;

a resonator tuned for a frequency band in which the receiver is intended to receive radio transmissions; and

a first series resonance circuit comprising a capacitor and a second coil connected in series between a first terminal of the first coil and a reference voltage of the portable apparatus,

wherein the resonator comprises a second series resonance circuit connected between a second terminal of the first coil and the radio receiver, and

further comprising a third resonance circuit arranged between the second terminal of the first coil and the rectifier to provide a high impedance at frequencies for radio reception and a low impedance for a frequency of the magnetic field for power distribution to the portable electronic device.

13. The charging system according to claim 12, wherein the resonator comprises the first coil and a capacitor connected in parallel therewith.

14. The charging system according to claim 13, further comprising a capacitor connected between a second terminal of the first coil and the radio receiver.

15. The charging system according to claim 12, wherein the third resonance circuit comprises a capacitor and a coil connected in parallel and having a resonance frequency at frequencies for radio reception.

16. The charging system according to claim 12, wherein the third resonance circuit comprises a capacitor and a coil connected in series and having a resonance frequency at a frequency of the magnetic field for power distribution to the portable electronic device.

17. The charging system according to claim 12, wherein the power supply output comprises a capacitor electrically connected across output terminals of the power supply output.

18. The charging system according to claim 12, wherein the radio receiver is arranged to receive radio transmissions within the AM band, and the magnetic field for power distribution is provided by the charging station in a frequency band different from the AM band.

19. The charging system according to claim 18, wherein the magnetic field for power distribution is provided by the charging station in a frequency between 100 kHz and 400 kHz, preferably between 175 kHz and 300 kHz, preferably about 200 kHz.

20. The charging system according to claim 18, wherein the magnetic field for power distribution is provided by the charging station in a frequency between 1800 kHz and 2400 kHz, preferably between 1900 kHz and 2200 kHz, preferably about 2000 kHz.

21. The charging system according to claim 12, wherein the first series resonance circuit is tuned to provide a short circuit for a frequency band in which the receiver is intended to receive radio transmissions.

22. The charging system according to claim 12, wherein the reference voltage is a ground reference of the portable electronic device.