Device and method for supplying a data transfer unit with energy

• US 7,571,853 B2
• Filed: 05/13/2005
• Issued: 08/11/2009
• Est. Priority Date: 11/19/2002
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Missoni, Albert, Baglin, Thomas Jean Ludovic
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US11/129,068
• Publication Number:
  US 20050252972A1
• Time in Patent Office: 1,551 Days
• Field of Search: 235/451, 235/492, 235/486, 235/487, 235/380, 235/382, 235/441
• US Class Current: 235/451
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs

Abstract

Device for supplying a data transfer unit with energy, having an energy supply input via which the energy can be fed into the data transfer unit, and a decoupling unit for coupling and decoupling the energy supply input to and from the data transfer unit, wherein the decoupling unit decouples when a supply voltage for the data transfer unit leaves a tolerance range.

Claims

1. A device for supplying a data transfer unit with energy, comprising:

an energy supply input unit configured to generate a first energy signal, which is fed contactlessly by means of an electric field, and to supply the first energy signal to the data transfer unit;

an energy store unit configured to supply the data transfer unit with a second energy signal supplementing the first energy signal;

a switch unit configured to switch the second energy signal to the data transfer unit; and

a control unit configured to control the switch to connect the energy store unit to the data transfer unit via the switch unit, if the first energy signal voltage falls below a tolerance value.

2. The device as claimed in claim 1, wherein the energy store unit comprises a capacitance.

3. The device as claimed in claim 1, wherein the switch unit is an N-channel MOS transistor.

4. The device as claimed in claim 1, further comprising a diode connected between the energy supply input unit and the data transfer unit.

5. The device as claimed in claim 1, further comprising a further diode connected between the energy store unit and the energy supply input unit.

6. The device as claimed in claim 1, further comprising a series regulator, which is configured to keep the supply voltage of the data transfer unit constant.

7. The device as claimed in patent claim 6, wherein the series regulator comprises a transistor connected between the energy supply input unit and the data transfer unit.

8. The device as claimed in claim 1, further comprising a further capacitance connected in parallel with the data transfer unit.

9. The device as claimed in claim 1, wherein the tolerance value has a modulation index of at most 14%.

10. A device for supplying a data transfer means with energy, comprising:

an energy supply input means for generating a first energy signal, which is fed contactiessly by means of an electric field, and for supplying the first energy signal to the data transfer means;

an energy storage for supplying the device with a second energy signal supplementing the first energy signal;

a switching means for switching the second energy signal to the data transfer means; and

a control means for controlling the switching means to connect the energy storage means to the data transfer means via the switching means, if the first energy signal voltage falls below a tolerance value.

11. The device as claimed in claim 10, wherein the energy storage means comprises a capacitance.

12. The device as claimed in claim 10, wherein the switching means is an N-channel MOS transistor.

13. The device as claimed in claim 10, further comprising a diode connected between the energy supply input means and the data transfer means.

14. The device as claimed in claim 10, further comprising a further diode connected between the energy storage means and the energy supply input means.

15. The device as claimed in claims 10, further comprising a series regulating means for keeping the supply voltage of the data transfer means constant.

16. The device as claimed in claim 15, wherein the series regulating means comprises a transistor connected between the energy supply input means and the data transfer means.

17. The device as claimed in claim 10, further comprising a further capacitance connected in parallel with the data transfer means.

18. The device as claimed in claim 10, wherein the tolerance value has a modulation index of at most 14%.

19. A method for supplying a data transfer unit with energy, comprising:

feeding a first energy signal contactlessly by means of an electric field into the data transfer unit via an energy supply input; and

feeding a second energy signal, which supplements the first energy signal, by means of an energy storage unit into the data transfer unit if the supply voltage of the data transfer unit falls below a tolerance value,

wherein the energy storage unit is connected to the data transfer unit via a switch, which is controlled by a control unit.

20. The method as claimed in claim 19, wherein the energy storage unit stores an electrical charge.

21. The method as claimed in claim 19, wherein the switch is realized by transforming an ohmic resistance.

22. The method as claimed in claim 19, wherein the first energy signal is controlled by a diode from the energy supply input to the data transfer unit.

23. The method as claimed in claim 19, wherein the second energy signal is controlled by a further diode from the energy storage unit to the energy supply input.

24. The method as claimed in claim 19, wherein the supply voltage of the data transfer unit is serially regulated to be kept constant.

25. The method as claimed in claim 24, wherein the serial regulation is realized by transforming an ohmic resistance between the energy supply input and the data transfer unit.

26. The method as claimed in claim 19, wherein a further energy storage unit is connected in parallel with the data transfer unit and stores an electrical charge.

27. The method as claimed in claim 19, wherein the tolerance value has a modulation index of at most 14%.