Interference mitigation for multiple inductive systems

• US 9,344,155 B2
• Filed: 01/07/2013
• Issued: 05/17/2016
• Est. Priority Date: 01/08/2012
• Status: Active Grant

• Current Assignee: Philips IP Ventures B.V. (Koninklijke Philips N.V.)
• Original Assignee: Access Business Group International LLC (Alticor Incorporated)
• Inventors: Moes, Benjamin C., Kuyvenhoven, Neil W., Nguyen, Hai D., Schwannecke, Joshua K., Liff, Dale R., Zup, Andrew
• Primary Examiner(s): Rivero, Alejandro
• Application Number:
  US14/369,417
• Publication Number:
  US 20140349573A1
• Time in Patent Office: 1,226 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B60L 2250/12 by confirmation, e.g. of the input
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/305 Communication interfaces
• CPC Class Codes: B60L 53/34 Plug-like or socket-like devices specially adapted for contactless inductive charging of electric vehicles positioning means for charging devices using inductive energy transfer B60L53/38
• CPC Class Codes: E05B 2047/0061 using induction
• CPC Class Codes: E05B 2047/0063 Energy transfer from key to lock, e.g. for emergency opening
• CPC Class Codes: E05B 81/88 using inductive energy transmission
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 50/80 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: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/73 for taking measurements, e.g. using sensing coils
• CPC Class Codes: H04B 5/77 for interrogation
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

A system and method for mitigating interference between two or more inductive systems. Interference can be mitigated by, in response to an interference causing event, temporarily adjusting operation of one or more of the inductive sub-systems to reduce interference. A controller can receives communication from multiple inductive systems and instruct the systems to operate so as to reduce interference. The inductive systems can coordinate to operate out of phase with respect to one another to reduce interference. Communication from a data transfer inductive system can be mimicked by another inductive system so that both systems transmit the communication. Interference between multiple inductive systems can be mitigated by specific physical positioning of the transmitters of the inductive sub-systems.

Claims

1. A method for reducing electromagnetic interference between a first inductive system and a second inductive system, the method comprising:

determining there is interference between the first inductive system and the second inductive system;

in response to determining there is interference between the first inductive system and the second inductive system, adjusting operation of the first inductive system to reduce the interference;

wherein adjusting operation of the first inductive system includes adjusting an operating frequency of the first inductive system away from an operating frequency of the second inductive system whereby interference between the first inductive system and the second inductive system is reduced;

wherein the first inductive system adjusts at least one of rail voltage, phase, and duty cycle to maintain constant power transfer to a device while the operating frequency of the first inductive system is adjusted, wherein said adjusting operation of the first inductive system includes mimicking a communication signal of the second inductive system.

2. The method for reducing interference between the first inductive system and the second inductive system of claim 1 wherein said determining includes receiving a communication from at least one of the first inductive system and the second inductive system indicative of an interference causing event.

3. The method for reducing interference between the first inductive system and the second inductive system of claim 1 wherein said determining includes receiving a system prompt.

4. The method for reducing interference between the first inductive system and the second inductive system of claim 3 wherein the system prompt includes at least one of a vehicle shifting into gear, a door opening, and a start button being pressed.

5. The method for reducing interference between the first inductive system and the second inductive system of claim 3 wherein the system prompt includes a timer event.

6. The method for reducing interference between the first inductive system and the second inductive system of claim 1 including receiving communication from the first inductive system and the second inductive system, wherein the determining includes analyzing the communication, and instructing the first inductive system to operate so as to reduce interference between the first inductive system and the second inductive system.

7. The method for reducing interference between the first inductive system and the second inductive system of claim 1 wherein the adjusting operation of the first inductive system to reduce the interference includes coordinating with the second inductive system to operate out of phase with respect to the second inductive system to reduce interference.

8. The method for reducing interference between the first inductive system and the second inductive system of claim 7 wherein the first inductive system and the second inductive system operate at ninety degrees out of phase.

9. A system for reducing electromagnetic interference comprising:

a first inductive system;

a second inductive system; and

a controller in communication with at least one of the first inductive system and the second inductive system, wherein the controller is programmed to determine whether there is interference between the first inductive system and the second inductive system, and in response to determining there is interference, adjusting operation of the first inductive system to reduce the interference;

wherein adjusting operation of the first inductive system includes adjusting an operating frequency of the first inductive system away from an operating frequency of the second inductive system whereby interference between the first inductive system and the second inductive system is reduced;

wherein the first inductive system adjusts at least one of rail voltage, phase, and duty cycle to maintain constant power transfer to a device while the operating frequency of the first inductive system is adjusted, wherein said adjusting operation of the first inductive system includes mimicking a communication signal of the second inductive system.

10. The system for reducing interference of claim 9 wherein said determining includes receiving a communication from at least one of the first inductive system and the second inductive system indicative of an interference causing event.

11. The system for reducing interference of claim 9 wherein said determining includes receiving a system prompt.

12. The system for reducing interference of claim 11 wherein the system prompt includes at least one of a vehicle shifting into gear, a door opening, and a start button being pressed.

13. The system for reducing interference of claim 11 wherein the system prompt includes a timer event.

14. The system for reducing interference of claim 9 wherein the controller is programmed to receive communication from the first inductive system and the second inductive system, wherein the determining includes analyzing the communication and instructing at least one of the first inductive system and the second inductive system to operate so as to reduce interference between the first inductive system and the second inductive system.

15. The system for reducing interference of claim 9 wherein the adjusting operation of the first inductive system to reduce interference includes coordinating with the second inductive system to operate out of phase with respect to the second inductive system to reduce interference.

16. The system for reducing interference of claim 15 wherein the first inductive system and the second inductive system operate at ninety degrees out of phase.