System and method for providing wireless power transfer functionality to an electrical device

• US 9,337,902 B2
• Filed: 06/23/2014
• Issued: 05/10/2016
• Est. Priority Date: 03/17/2008
• Status: Active Grant

• Current Assignee: Powermat Technologies, Ltd.
• Original Assignee: Powermat Technologies, Ltd.
• Inventors: Raines, Moshe, Raab, Yoel, Hamisha, Charle, Nudelman, Arye, Shraga, Rotem, Greenwald, Oola
• Primary Examiner(s): GONZALES, APRIL GUZMAN
• Application Number:
  US14/311,849
• Publication Number:
  US 20140302782A1
• Time in Patent Office: 687 Days
• Field of Search: 455/41.1, 455/41.2, 455/41.3
• US Class Current: 1/1
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H01F 27/266 Fastening or mounting the core on casing or support on coil H01F27/30
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

An electrical device includes a host charger power management integrated circuit wired to a battery, a wired power input comprising a first VOUT and GND pair of power connectors wired to a first pair of charging inputs of the host charger power management integrated circuit, a wireless power port for conductively connecting with a retrofittable wireless power receiver, said wireless power port comprising a second VOUT and GND pair of power connectors wired to a second pair of charging inputs of the host charger power management integrated circuit; and a power DISABLE connector for communicating a DISABLE signal to disable charging.

Claims

1. A retrofittable wireless power receiver for providing inductive power reception functionality to at least one host device, said retrofittable wireless power receiver comprising:

a support platform;

a secondary inductor operable to couple inductively with a primary inductor associated with a wireless power transmitter;

a power reception circuit operable to control inductive power transfer from the primary inductor to the host device;

a synchrorectifier comprising;

at least two input terminals wired to said secondary inductor;

at least two output terminals wired to at least two transmission power electrical contacts for providing a power channel to said host device;

a first MOSFET having one anode wired to a first output terminal and one cathode wired to a first input terminal;

a second MOSFET having one anode wired to said first output terminal and one cathode wired to a second input terminal;

a third MOSFET having one anode wired to said first input terminal and one cathode wired to a second output terminal; and

a fourth MOSFET having one anode wired to said second input terminal and one cathode wired to said second output terminal;

a near field communication antenna;

an array of electrical contacts comprising;

a VOUT and GND pair of terminals wired to said sychrorectifier;

a DISABLE terminal wired to said power reception circuit and configured to disable power transfer; and

a pair of data contacts wired to said near field communication antenna.

2. The retrofittable wireless power receiver of claim 1 wherein said power reception circuit comprises a signal transmission circuit for passing feedback signals to the wireless power transmitter for regulating power transfer, said signal transmission circuit comprising at least one electrical element connectable to the secondary inductor according to a modulated signal.

3. The retrofittable wireless power receiver of claim 1 wherein said VOUT and GND pair are configured to provide an output of 5 V.

4. The retrofittable wireless power receiver of claim 1 further comprising at least one magnetic shield for guiding magnetic flux away from electrical components of said host device.

5. The retrofittable wireless power receiver of claim 1 wherein said signal transmission circuit is further configured to automatically terminate the charging process.

6. The retrofittable wireless power receiver of claim 1 wherein said support platform comprises a rigid material.

7. The retrofittable wireless power receiver of claim 6 wherein said rigid material comprises a card.

8. A retrofittable wireless power receiver for providing inductive power reception functionality to at least one host device, said retrofittable wireless power receiver comprising:

a support platform;

a secondary inductor operable to couple inductively with a primary inductor associated with a wireless power transmitter;

a synchrorectifier comprising;

at least two input terminals wired to said secondary inductor;

at least two output terminals wired to at least two transmission power electrical contacts for providing a power channel to said host device;

a first MOSFET having one anode wired to a first output terminal and one cathode wired to a first input terminal;

a second MOSFET having one anode wired to said first output terminal and one cathode wired to a second input terminal;

a third MOSFET having one anode wired to said first input terminal and one cathode wired to a second output terminal; and

a fourth MOSFET having one anode wired to said second input terminal and one cathode wired to said second output terminal;

a signal transmission circuit for passing feedback signals to the wireless power transmitter for regulating power transfer, said signal transmission circuit comprising at least one electrical element connectable to the secondary inductor according to a modulated signal; and

an array of electrical contacts for conductively connecting the retrofittable wireless power receiver to a host device.

9. The retrofittable wireless power receiver of claim 8 wherein said array of electrical contacts comprises a VOUT and GND pair of terminals.

10. The retrofittable wireless power receiver of claim 9 wherein said VOUT and GND pair are configured to provide an output of 5 V.

11. The retrofittable wireless power receiver of claim 8 wherein said array of electrical contacts comprises a DISABLE terminal configured to disable charging.

12. The retrofittable wireless power receiver of claim 8 wherein said array of electrical contacts comprises a DISABLE connected to a GND terminal via a resistor.

13. The retrofittable wireless power receiver of claim 8 wherein said array of electrical contacts further comprises a pair of data contacts.

14. The retrofittable wireless power receiver of claim 13 wherein said pair of data contacts are wired to a near field communication antenna.

15. The retrofittable wireless power receiver of claim 8 further comprising at least one magnetic shield for guiding magnetic flux away from electrical components of said host device.

16. The retrofittable wireless power receiver of claim 8 wherein said signal transmission circuit is further configured to automatically terminate the charging process.

17. The retrofittable wireless power receiver of claim 8 wherein said support platform comprises a rigid material.

18. The retrofittable wireless power receiver of claim 17 wherein said rigid material comprises a card.

19. The retrofittable wireless power receiver of claim 18 wherein said rigid material comprises a back cover of said host device.

20. The retrofittable wireless power receiver of claim 17 wherein said rigid material comprises a back cover of said host device.