POWER TRANSMITTER AND POWER RECEIVER FOR AN INDUCTIVE POWER SYSTEM

• US 20130193773A1
• Filed: 10/04/2011
• Published: 08/01/2013
• Est. Priority Date: 10/13/2010
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Van Wageningen, Andries
• Granted Patent: US 10,320,244 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• 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

A wireless inductive power transfer system comprises a power transmitter for transmitting power inductively to a power receiver via transmitter coil 11 to receiver coil 21. In the system, a communication method comprises a step 37 of transmitting, by the power receiver, first data and second data to the power transmitter, the first data indicating a modulation requirement, and the second data indicating an inquiry message; a step 32 for receiving, by the power transmitter, the first data and the second data from the power receiver, a step 34 for transmitting, by the power transmitter, a response message for responding to said inquiry message, by modulating a power signal according to said modulation requirement so as to carry the response message; and a step 35 for receiving the response message by the power receiver by demodulating the modulated power signal carrying the response message received via the receiver coil from the power transmitter.

Claims

1. Power transmitter for transmitting power inductively to a power receiver via transmitter coil, the power transmitter comprising:

a first unit for receiving first data and second data from the power receiver, said first data indicating a modulation requirement, said second data indicating an inquiry message; and

a second unit for transmitting a response message to the power receiver via the transmitter coil, the response message being intended for responding to said inquiry message, said second unit comprising;

a modulator for modulating a power signal according to said modulation requirement when transmitting the response message.

2. Power transmitter as claimed in claim 1, wherein said modulation requirement is indicative of the demodulation capability of the power receiver.

3. Power transmitter as claimed in claim 1, wherein said second data further indicates at least one of the following:

a format of said response message;

a time requirement for transmitting said response message;

wherein the power transmitter is arranged to transmit said response message according to at least one of the format and the time requirement.

4. Power transmitter as claimed in claim 1, wherein the modulation requirement corresponds to at least one of the following:

a type of modulation of the power signal,

a modulation range for a certain type of modulation.

5. Power transmitter as claimed in claim 4, wherein the type of modulation of the power signal is selected from the following:

amplitude modulation;

frequency modulation;

phase modulation;

wherein the modulation range is selected from the following;

a modulation depth for amplitude modulation of the power signal,

a frequency shift for frequency modulation of the power signal,

a phase shift for phase modulation of the power signal.

6. Power transmitter as claimed in claim 1, wherein said first data and second data are in a single data packet or in two separate data packets.

7. Power receiver for receiving power inductively from a power transmitter via a receiver coil, the power receiver comprising:

a first unit for transmitting first data and second data to the power transmitter, the first data indicating a modulation requirement, the second data indicating an inquiry message; and

a second unit for receiving a response message from the power transmitter via the receiver coil, the response message being intended for responding to the inquiry message;

said second unit comprising;

a demodulator for demodulating a power signal received by the receiver coil according to the modulation requirement when receiving the response message.

8. Power receiver as claimed in claim 7, wherein said modulation requirement is indicative of the demodulation capability of the power receiver.

9. Power receiver as claimed in claim 7, wherein said second data further indicates at least one of the following:

a format of said response message;

a time requirement for transmitting said response message;

wherein the power receiver is arranged to transmit said response message according to at least one of the format and the time requirement.

10. Power receiver as claimed in claim 7, wherein the modulation requirement corresponds to at least one of the following:

a type of modulation of the power signal,

a modulation range for a certain type of modulation.

11. Power receiver as claimed in claim 7, wherein the type of modulation of the power signal is selected from the following:

amplitude modulation;

frequency modulation;

phase modulation;

wherein the modulation range is selected from the following;

a modulation depth for amplitude modulation of the power signal,

a frequency shift for frequency modulation of the power signal,

a phase shift for phase modulation of the power signal.

12. Power receiver as claimed in claim 7, wherein said first data and second data are sent via a single data packet or via two separate data packets.

13. Method of communicating in an inductive power transfer system, the system comprising a power receiver and a power transmitter, the power receiver comprising a receiver coil, the power transmitter comprising a transmitter coil, the method performed by the power transmitter comprising the steps of:

receiving first data and second data from the power receiver, said first data indicating a modulation requirement, said second data indicating an inquiry message;

transmitting a response message to the power receiver via the transmitter coil by modulating a power signal according to the modulation requirement, the response message being intended for responding to the inquiry message.

14. Method as claimed in claim 13, wherein the modulation requirement corresponds to any one of the following:

a type of modulation of the power signal,

a modulation depth for amplitude modulation of the power signal,

a frequency shift for frequency modulation of the power signal,

a phase shift for phase modulation of the power signal.

15. Method of communicating in an inductive power transfer system, the system comprising a power receiver and a power transmitter, the power receiver comprising a receiver coil, the power transmitter comprising a transmitter coil, wherein the method performed by the power receiver comprises the steps of:

transmitting a first data and a second data to the power transmitter, the first data indicating a modulation requirement, the second data indicating an inquiry message;

receiving a response message from the transmitter via the receiver coil by demodulating a power signal received by the receiver coil according to the modulation requirement, the response message being intended for responding to the inquiry message.

16. Method as claimed in claim 15, wherein the modulation requirement corresponds to any one of the following:

a type of modulation of the power signal,

a modulation depth for amplitude modulation of the power signal,

a frequency shift for frequency modulation of the power signal,

a phase shift for phase modulation of the power signal.