Non-contact power transmission system, receiving apparatus and transmitting apparatus

• US 20120235508A1
• Filed: 03/12/2012
• Published: 09/20/2012
• Est. Priority Date: 03/16/2011
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Maxell Limited (Hitachi, Ltd.)
• Inventors: ICHIKAWA, Katsuei
• Granted Patent: US 9,154,003 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 7/00045 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 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/70 specially adapted for specific purposes
• CPC Class Codes: H04B 5/72 for local intradevice communication
• 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

Abstract

A non-contact power transmission system comprises: a primary coil including a power supply coil and a magnetic resonance coil; and a secondary coil including a load coil, thereby transmitting an electric power from the power supply coil at a self-resonating frequency of the magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of the secondary coil through magnetic coupling, with non-contact, wherein the electric power is transmitted, with non-contact, with applying magnetic coupling in coupling between the power supply coil and the magnetic resonance coil and coupling between the magnetic resonance coil and the load coil.

Claims

1. A non-contact power transmission system, comprising:

a primary coil including a power supply coil and a magnetic resonance coil; and

a secondary coil including a load coil, thereby transmitting an electric power from said power supply coil at a self-resonating frequency of said magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of said secondary coil through magnetic coupling, with non-contact, wherein

the electric power is transmitted, with non-contact, with applying magnetic coupling in

coupling between said power supply coil and said magnetic resonance coil and coupling between said magnetic resonance coil and said load coil.

4. The non-contact power transmission system, as described in the claim 1, wherein said magnetic resonance coil has structure, both ends thereof being electrically separated, and the magnetic fields, which are generated by said magnetic resonance coil before and after a resonating frequency of said magnetic resonance coil, differs from, by 180 degrees in phases thereof, by forming a parallel resonance circuit, mainly, with the parasitic capacitance between the would wires of said magnetic resonance coil and the self inductance of said magnetic resonance coil.

6. The non-contact power transmission system, as described in the claim 1, wherein the magnetic fields, which are generated by said magnetic resonance coil before and after a resonating frequency of said magnetic resonance coil, differ from by 180 degrees in phases thereof, by connecting a resonance capacitor across both ends of said magnetic resonance coil, to build up a parallel resonance circuit with said magnetic resonance coil and said resonance capacitor.

11. The non-contact power transmission system, as described in the claim 1, wherein an inductance value of said load coil is smaller than that of said magnetic resonance coil, and is larger than that of said power supply coil.

14. The non-contact power transmission system, as described in the claim 1, wherein said power supply coil and said load coil are so arranged that a distance between those is closer than the distance between said magnetic resonance coil and said load coil.

17. The non-contact power transmission system, as described in the claim 1, wherein a modulator/demodulator circuits are connected with said primary coil and said secondary coil, so as to conduct communication between said primary coil and said secondary coli through superimposing a modulated signal on a power signal transmitted from said primary coil, as well as, transmitting the electric power from said primary coil to said secondary coil, and thereby having a communication means.

20. The non-contact power transmission system having the communication means, as described in the claim 17, wherein at least a load modulation method is applied in the communication from said secondary coil to said primary coil.

23. The non-contact power transmission system having the communication means, as described in the claim 17, has the structure to conduct the communication between said primary coil and said secondary coil, while transmitting the electric power from said primary coil to said secondary coil, wherein a frequency for transmitting the electric power differs from that for conducting the communication.

30. The non-contact power transmission system, as described in the claim 1, wherein the non-contact communication means for conducting authentication and reading/writing of data with non-contact is a questioner, while the non-contact communication means included in said power receiving apparatus is a responder.

2. A non-contact power transmission system, comprising:

a primary coil including a power supply coil and a magnetic resonance coil; and

a secondary coil including a load coil, thereby transmitting an electric power from said power supply coil at a self-resonating frequency of said magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of said secondary coil through magnetic coupling, with non-contact, wherein

a resonance circuit, which resonates with the inductance of the load coil, is added to the load coil of said secondary coil, through at least a series connection or a parallel connection.

3. The non-contact power transmission system, as described in the claim 2, wherein the electric power can be taken out, with non-contact, by magnetically coupling a magnetic field, which is generated upon an occurrence of a parallel resonance phenomenon by said magnetic resonance coil, accompanying with supply of the electric power to said power supply coil, with using a series resonance phenomenon or a parallel resonance phenomenon of said load coil.

5. The non-contact power transmission system, as described in the claim 2, wherein said magnetic resonance coil has structure, both ends thereof being electrically separated, and the magnetic fields, which are generated by said magnetic resonance coil before and after a resonating frequency of said magnetic resonance coil, differ from by 180 degrees in phases thereof, by forming a parallel resonance circuit, mainly, with the parasitic capacitance between the would wires of said magnetic resonance coil and the self inductance of said magnetic resonance coil.

7. The non-contact power transmission system, as described in the claim 2, wherein the magnetic fields, which are generated by said magnetic resonance coil before and after a resonating frequency of said magnetic resonance coil, differ from by 180 degrees in phases thereof, by connecting a resonance capacitor across both ends of said magnetic resonance coil, to build up a parallel resonance circuit with said magnetic resonance coil and said resonance capacitor.

8. The non-contact power transmission system, as described in the claim 2, wherein a switching element is added to a resonance capacitor, in parallel, when the capacitor resonating with the load coil of said secondary is connected in series, while the switching element is added to the resonance capacitor, in series, when the capacitor resonating with the load coil of said secondary is connected in parallel, and thereby transmitting the electric power by exchanging the switching element to a large electric power received while comparing the electric powers received when the switching element is turned ON and when it is OFF.

12. The non-contact power transmission system, as described in the claim 2, wherein an inductance value of said load coil is smaller than that of said magnetic resonance coil, and is larger than that of said power supply coil.

15. The non-contact power transmission system, as described in the claim 2, wherein said power supply coil and said load coil are so arranged that a distance between those is closer than the distance between said magnetic resonance coil and said load coil.

18. The non-contact power transmission system, as described in the claim 2, wherein a modulator/demodulator circuits are connected with said primary coil and said secondary coil, so as to conduct communication between said primary coil and said secondary coli through superimposing a modulated signal on a power signal transmitted from said primary coil, as well as, transmitting the electric power from said primary coil to said secondary coil, and thereby having a communication means.

21. The non-contact power transmission system having the communication means, as described in the claim 18, wherein at least a load modulation method is applied in the communication from said secondary coil to said primary coil.

24. The non-contact power transmission system having the communication means, as described in the claim 18, has the structure to conduct the communication between said primary coil and said secondary coil, while transmitting the electric power from said primary coil to said secondary coil, wherein a frequency for transmitting the electric power differs from that for conducting the communication.

31. The non-contact power transmission system, as described in the claim 2, wherein the non-contact communication means for conducting authentication and reading/writing of data with non-contact is a questioner, while the non-contact communication means included in said power receiving apparatus is a responder.

9. A non-contact power transmission system, comprising:

a primary coil including a power supply coil and a magnetic resonance coil; and

a secondary coil including at least a load coil, thereby transmitting an electric power from said power supply coil at a self-resonating frequency of said magnetic resonance coil, which is determined by a parasitic capacitance between wound wires of the coil and a self inductance of the coil, and taking out the electric power supplied, from the load coil of said secondary coil through magnetic coupling, with non-contact, wherein

said magnetic resonance coil has at least two (2) or more coils, differing from in the self-resonating frequency thereof, and

the electric power is supplied to said plural numbers of magnetic resonance coils from said power supply coil.

10. The non-contact power transmission system, as described in the claim 9, wherein a resonating frequency between said load coil and the resonance coil lies in a range between a lowest frequency and a highest frequency of the magnetic resonance coils, which are provided in pleural numbers thereof.

13. The non-contact power transmission system, as described in the claim 9, wherein an inductance value of said load coil is smaller than that of said magnetic resonance coil, and is larger than that of said power supply coil.

16. The non-contact power transmission system, as described in the claim 9, wherein said power supply coil and said load coil are so arranged that a distance between those is closer than the distance between said magnetic resonance coil and said load coil.

19. The non-contact power transmission system, as described in the claim 9, wherein a modulator/demodulator circuits are connected with said primary coil and said secondary coil, so as to conduct communication between said primary coil and said secondary coli through superimposing a modulated signal on a power signal transmitted from said primary coil, as well as, transmitting the electric power from said primary coil to said secondary coil, and thereby having a communication means.

22. The non-contact power transmission system having the communication means, as described in the claim 19, wherein at least a load modulation method is applied in the communication from said secondary coil to said primary coil.

25. The non-contact power transmission system having the communication means, as described in the claim 19, has the structure to conduct the communication between said primary coil and said secondary coil, while transmitting the electric power from said primary coil to said secondary coil, wherein a frequency for transmitting the electric power differs from that for conducting the communication.

32. The non-contact power transmission system, as described in the claim 9, wherein the non-contact communication means for conducting authentication and reading/writing of data with non-contact is a questioner, while the non-contact communication means included in said power receiving apparatus is a responder.

26. In a non-contact power transmission system, comprising, at least:

a power transmitting apparatus for transmitting an electric power with non-contact; and

a power receiving apparatus for receiving the electric power transmitted from said power transmitting apparatus, wherein

said power receiving apparatus has at least a resonance coil and a load coil, magnetically coupling with each other, and is connected with a first resonance circuit for resonating with said resonance coil at a first frequency, as well as, connected with a second resonance circuit for resonating at a second frequency through a filter, and further a first input terminal is provided, wherein said filter has such structure that it passes the signal of said second frequency therethrough but blocks the signal of said first frequency thereby, and from said first output terminal is outputted a signal of said second frequency while said load coil outputs a signal of said first frequency through magnetic coupling with magnet from said resonance coil.

27. In a non-contact power transmission system, comprising, at least:

a power transmitting apparatus for transmitting an electric power with non-contact; and

a power receiving apparatus for receiving the electric power transmitted from said power transmitting apparatus, wherein

said power transmitting apparatus has at least a power supply coil and a resonance coil, magnetically coupling with each other, and is connected with a first resonance circuit for resonating with said resonance coil at a first frequency, as well as, connected with a second resonance circuit for resonating at a second frequency through a filter, and further a first input terminal is provided, wherein said filter has such structure that it passes the signal of said second frequency therethrough but blocks the signal of said first frequency thereby, and the signal of said second frequency is supplied from said first input terminal, while from said power supply coil is supplied the signal of said first frequency.

28. A non-contact power transmission system, comprising:

a power transmitting apparatus for transmitting an electric power to be transmitted to a power receiving apparatus, with non-contact, including a first non-contact communication means; and

a power receiving apparatus, including a second non-contact communication means for conducting communication between said non-contact communication means, with non-contact, and a power receiving means for receiving the electric power transmitted from said power transmitting apparatus, with non-contact, and sharing an antenna for conducting the non-contact communication and a antenna coil for receiving the electric power transmitted from said power transmitting apparatus, in common, wherein

the power receiving means of said power receiving apparatus has such structure that a first resonance circuit is connected with a power receiving coil, in parallel, and the electric power rectified by a rectifying means is taken out, after connecting a second resonance circuit through a first filter circuit, in series or in parallel, and said second non-contact communication means has such structure that a load coil is provided in vicinity of the power receiving coil so as to magnetically couple with said power receiving coil, thereby to provide said load coil with a modulator/demodulator circuit for communicating with said first non-contact communication means through the second filter circuit,

said first resonance circuit has a capacitor of such capacitance value that it resonates with an inductance value of said power receiving coil at a signal frequency for conducting non-contact communication, said second resonance circuit has a capacitor of such capacitance value that it resonates with said power receiving coil at a signal frequency for conducting non-contact transmission of the electric power, and wherein, said first filter circuit passes therethrough the frequency for conducting the non-contact transmission of the electric power, while blocking the signal frequency for conducting the non-contact communication, and said second filter circuit passes therethrough the signal frequency for conducting the non-contact communication, while blocking the frequency for conducting the non-contact transmission of the electric power.

29. The non-contact power transmission system, as described in the claim 28, wherein the frequency for conducting the non-contact transmission of the electric power to be transmitted is a frequency lower than a frequency of the signal communicated from said non-contact communication means, in the structure thereof, a low-pass filter is applied to said first filter circuit while a high-pass filter to said second filter circuit, and the first resonance circuit and said second resonance circuit are capacitances.

33. The non-contact power transmission system, as described in the claim 28, wherein the non-contact communication means for conducting authentication and/or reading/writing of data with non-contact is a questioner, while the non-contact communication means included in said power receiving apparatus is a responder.

34. A non-contact power transmission system, comprising:

a power transmitting apparatus, having a first non-contact communication means for conducting non-contact transmission of data for authentication and/or reading/writing of data, for transmitting electric power to be transmitted to a power receiving apparatus with non-contact; and

a power receiving apparatus having a second non-contact communication means for conducting non-contact communication between said non-contact communication means and a power receiving means for receiving the electric power transmitted from said power transmitting apparatus with non-contact, wherein

said second non-contact communication means has a first questioner and a first responder in common in the structure thereof, and if said first non-contact communication means is a second questioner, it turns said first responder into ON condition when receiving a signal from a second questioner, so as to transmit a response data signal responding to a question data signal from the second questioner, and if said first non-contact communication means is a second responder, it turns said first questioner into ON condition, so as to transmit a question data signal to said second responder, and also conducts receiving of a response data signal from the second responder.