SYSTEM AND METHOD FOR PROVIDING AND CONTROLLING INDUCTIVE POWER CHARGING

• US 20150288217A1
• Filed: 06/17/2015
• Published: 10/08/2015
• Est. Priority Date: 01/08/2012
• Status: Active Grant

• Current Assignee: Powermat Technologies, Ltd.
• Original Assignee: Powermat Technologies, Ltd.
• Inventors: MACH, Elieser, MOSHKOVICH, Oz, PODKAMIEN, Ian, KOREN, Yuval
• Granted Patent: US 9,548,625 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 50/12 of the resonant type
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Wireless power transfer between power transmitters and power receivers may be established by a digital ping phase during which the wireless power transmitter applies a power signal and waits for a valid response message from the power receiver. The response message may include an identification code and a checksum byte used by the power transmitter to validate the identification code. When a valid response is received, the power transmitter transitions to a power transfer phase.

Claims

1. A method for establishing wireless power transfer from a wireless power transmitter to a wireless power receiver by said power transmitter executing a digital ping comprising:

applying a power signal;

waiting for a valid response message; and

if a valid response message is received then transitioning to a power transfer phase.

2. The method of claim 1 further comprising removing the power signal if no valid response message is received within a time window.

3. The method of claim 1 further comprising transitioning to a standby phase if no valid response message is received within a time window.

4. The method of claim 1, said valid response message comprising an identification signal having at least a preamble byte, a header byte, a characteristic identification code, and a checksum byte.

5. The method of claim 4 wherein said characteristic identification code comprises a body including at least a start bit, a string of eight bits representing a byte, and a stop bit.

6. The method of claim 4 further comprising said wireless transmitter validating said response message by comparing the received checksum byte with a calculated value.

7. The method of claim 4 wherein said checksum byte comprises a cyclic redundancy check (CRC).

8. The method of claim 1 wherein said response message comprises a body including at least a start bit, a string of eight bits representing a byte, and a stop bit.

9. A method for establishing wireless power transfer from a wireless power transmitter to a wireless power receiver by said power receiver executing a digital ping comprising:

detecting a power signal; and

sending a response message.

10. The method of claim 9 said response message comprising an identification signal having at least a preamble byte, a header byte, a characteristic identification code, and a checksum byte.

11. The method of claim 10 wherein said characteristic identification code comprises a message including at least a start bit, a string of eight bits representing a byte, and a stop bit.

12. A wireless power transmitter operable to transfer power wirelessly to a wireless power receiver, said wireless power transmitter operable to establish wireless power transfer by executing a digital ping comprising:

applying a power signal;

waiting for a valid response message; and

if a valid response message is received, then transitioning to a power transfer phase.

13. The wireless power transmitter of claim 12 further operable to remove the power signal if no valid packet is received within a time window.

14. The wireless power transmitter of claim 12 further operable to transition to a standby phase if no response message is received within a time window.

15. The wireless power transmitter of claim 12, said response message comprising an identification signal having at least a preamble byte, a header byte, a characteristic identification code, and a checksum byte.

16. The wireless power transmitter of claim 15 wherein said characteristic identification code comprises a body including at least a start bit, a string of eight bits representing a byte, and a stop bit.

17. The wireless power transmitter of claim 15 further operable to validate said response message by comparing the received checksum byte with a calculated value.

18. The wireless power transmitter of claim 15 wherein said checksum byte comprises a cyclic redundancy check (CRC).

19. The wireless power transmitter of claim 12 wherein said response message comprises a body including at least a start bit, a string of eight bits representing a byte, and a stop bit.

20. The wireless power transmitter of claim 12 operable in at least one phase selected from a ping phase, an identification phase, a standby phase and said power transfer phase.