Data carrier with load modulation means and with improved power supply in the process of load modulation

• US 6,301,138 B1
• Filed: 10/16/2000
• Issued: 10/09/2001
• Est. Priority Date: 10/22/1999
• Status: Expired due to Term

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Amtmann, Franz
• Primary Examiner(s): BERHANE, ADOLF D
• Application Number:
  US09/688,641
• Time in Patent Office: 358 Days
• Field of Search: 363/125, 363/126, 363/127, 235/380, 235/492, 340/825.54
• US Class Current: 363/126
• 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
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: H02M 1/009 having two or more independently controlled outputs for DC-DC converter with intermediate AC H02M3/33561
• CPC Class Codes: H02M 7/06 using discharge tubes without control electrode or semiconductor devices without control electrode

Abstract

In a data carrier (1) having a transmission coil (2) and having an integrated circuit (3) connected to the transmission coil (2) the integrated circuit includes rectifier means (9), energy storage means (10), data processing means (13) and load modulation means (14), and additional means (18) are connected to the load modulation means (14) and to the energy storage means (10), the additional means (18), when the load modulation means (14) are in their active condition, enabling a part of the energy stored in the transmission coil (2) to be applied to the energy storage means (10), which are connected to the additional means (18), the energy storage means (10) connected to the additional means (18) being utilized for powering the data processing means (13).

Claims

1. A data carrier

having a transmission coil for receiving a carrier signal and

having rectifier means, which are connected to the transmission coil and which enable a d.c. supply voltage to be generated by rectification of the carrier signal, and

having an energy storage means, which is connected to the rectifier means and to which the generated d.c. supply voltage can be applied for the purpose of storing energy, and

having data processing means which can be powered with the d.c. supply voltage with the aid of the energy storage means connected to the rectifier means, and

having load modulation means which can be switched between a rest condition and an active condition and which can be controlled from the data processing means and which are connected to the transmission coil and which enable the carrier signal received by the transmission coil to be load-modulated, namely by switching the load modulation means from their rest condition into their active condition, wherein

additional means are connected to the load modulation means, and

energy storage means are connected to the additional means, and

the additional means, when the load modulation means are in their active condition, enable a part of the energy stored in the transmission coil to be supplied to the energy storage means, which are connected to the additional means, and

the energy storage means, which are connected to the additional means, are utilized for powering the data processing means.

2. A data carrier as claimed in claim 1, wherein the additional means are formed by a voltage multiplier circuit.

3. A data carrier as claimed in claim 2, wherein the additional means are formed by a voltage doubler circuit.

4. A data carrier as claimed in claim 1, wherein the energy storage means, which are connected to the additional means, are formed by the energy storage means connected to the rectifier means.

5. An integrated circuit intended for a data carrier having a transmission coil for receiving a carrier signal and

having a terminal intended for the connection to a transmission coil of a data carrier and for the reception of a carrier signal, and

including rectifier means, which are connected to the terminal and which enable a d.c. supply voltage to be generated by rectification of the carrier signal, and

having an energy storage means, which is connected to the rectifier means and to which the generated d.c. supply voltage can be applied for the purpose of storing energy, and

having data processing means which can be powered with the d.c. supply voltage with the aid of the energy storage means connected to the rectifier means, and having load modulation means which can be switched between a rest condition and an active condition and which can be controlled from the data processing means and which are connected to the terminal and which enable the carrier signal received at the terminal to be load-modulated, namely by switching the load modulation means from their rest condition into their active condition, wherein additional means are connected to the load modulation means, and

energy storage means are connected to the additional means, and

the additional means, when the load modulation means are in their active condition, enable a part of the energy stored in the transmission coil to be supplied to the energy storage means, which are connected to the additional means, and

the energy storage means, which are connected to the additional means, are utilized for powering the data processing means.

6. An integrated circuit as claimed in claim 5, wherein the additional means are formed by a voltage multiplier circuit.

7. An integrated circuit as claimed in claim 6, wherein the additional means are formed by a voltage doubler circuit.

8. A integrated circuit as claimed in claim 5, wherein the energy storage means, which are connected to the additional means, are formed by the energy storage means connected to the rectifier means.