Wireless charger receiver-side communication interference elimination

• US 10,097,162 B2
• Filed: 06/18/2014
• Issued: 10/09/2018
• Est. Priority Date: 06/18/2014
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Niessen, Patrick, Geraets, Rene
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): WARMFLASH, MICHAEL J
• Application Number:
  US14/308,148
• Publication Number:
  US 20150372662A1
• Time in Patent Office: 1,574 Days
• Field of Search: 307104
• 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 50/10 using inductive coupling
• 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: H03H 11/04 Frequency selective two-port networks
• CPC Class Codes: H03H 7/0138 Electrical filters or coupling circuits
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Embodiments of an apparatus are disclosed. In an embodiment, a power receiver unit is disclosed. The power receiver unit includes a power pick-up unit, a communication modulator, and a filter. The power pick-up unit receives a wireless power signal. The communication modulator applies a modulation to the received wireless power signal. The filter suppresses a load signal from a load of the wireless charge receiver to prevent interference with the modulation.

Claims

1. A wireless power receiver unit comprising:

a power pick-up unit configured to receive a wireless power signal;

a communication modulator to apply a modulation to the received wireless power signal; and

a filter configured to suppress a load signal in the 1 to 2 kHz frequency band from a load of the wireless power receiver unit to prevent interference with the modulation.

2. The wireless power receiver unit of claim 1, wherein the filter is an active filter configured to constantly suppress the interference from the load.

3. The wireless power receiver unit of claim 2, wherein the active filter comprises a current regulator.

4. The wireless power receiver unit of claim 3, wherein the current regulator comprises an intermediate buffer.

5. The wireless power receiver unit of claim 4, wherein the intermediate buffer comprises:

an input stage;

a buffer capacitor; and

an output stage comprising a DC/DC converter.

6. The wireless power receiver unit of claim 5, wherein the input stage comprises a controlled current source or a controlled voltage source.

7. The wireless power receiver unit of claim 1, wherein the filter is a passive filter configured to suppress the interference during a communication stage.

8. The wireless power receiver unit of claim 7, wherein the passive filter comprises one of a list of components, the list comprising:

a capacitor;

a resistor; and

an inductor.

9. The wireless power receiver unit of claim 7, wherein the passive filter comprises a bypass switch to bypass the passive filter outside of the communication stage.

10. The wireless power receiver unit of claim 1, wherein the filter is coupled to a controller to manage the operation of the filter.

11. The wireless power receiver unit of claim 1, further comprising at least one modulation component configured to generate a communication by signal modulation.

12. A method for suppressing wireless power signal interference, the method comprising:

receiving a wireless power signal during a power mode;

modulating the received wireless power signal during a communication stage, wherein the communication stage occurs during the power mode; and

filtering a load signal in the 1 to 2 kHz frequency band to prevent interference affecting the modulation.

13. The method of claim 12, further comprising initiating a passive filter in response to detection of initiation of the communication stage.

14. The method of claim 13, further comprising bypassing the passive filter in response to detection of completion of the communication stage.

15. The method of claim 12, wherein filtering the load signal comprises actively filtering the load signal.

16. The method of claim 15, further comprising actively filtering the load signal in response to an input from a controller.

17. A wireless power system comprising:

a power sending unit configured to transmit a wireless power signal; and

a power receiver unit configured to receive the wireless power signal and modulate the received power signal to communicate with the power sending unit, wherein the power receiver unit comprises;

a filter configured to suppress a load signal in the 1 to 2 kHz frequency band to prevent interference in the modulated wireless power signal;

a communication modulator to apply a modulation to the received wireless power signal; and

a receiver communications and control unit configured to send input to the communication modulator to manage the signal modulation process.

18. The system of claim 17, wherein the filter is an active filter configured to constantly suppress the load signal to prevent interference affecting the modulated wireless power signal.

19. The system of claim 17, wherein the filter is a passive filter configured to suppress the load signal during a communication stage, wherein the communication stage is a period of time in which the power signal receiver modulates the wireless power signal.