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Appliance with an IC card reader and overload protection circuit

A technology of overload protection circuit and card reader, which is applied in the direction of instruments, data processing power supply, induction record carrier, etc., and can solve the problem of expensive

Inactive Publication Date: 2007-09-12
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This integrated circuit provides many functions and, therefore, is relatively expensive

Method used

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  • Appliance with an IC card reader and overload protection circuit
  • Appliance with an IC card reader and overload protection circuit
  • Appliance with an IC card reader and overload protection circuit

Examples

Experimental program
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Embodiment Construction

[0015] The device shown in FIG. 1 includes an IC card reader 3 powered by a power source 4 through a line 8 . The IC card reader 3 particularly includes a slot into which each IC card can be inserted, and a contact terminal for applying a power supply voltage VCC to the IC card and exchanging digital data between the IC card and the microcontroller 5 of the device. The IC card reader 3 further includes a card presence switch 2 that supplies a signal "CARD-DET" to the microcontroller 5 through a signal line 7 when an IC card is inserted. The card presence switch 2 is a mechanical switch operated when an IC card is inserted. If the IC card is inserted, switch 2 is turned on. Then, as explained with reference to FIG. 2, a logic "HIGH" signal is supplied to the microcontroller 5 through various circuits.

[0016] According to the present invention, the overload protection circuit is coupled between the line 8 of the power supply voltage VCC and the line 7 of the card detection s...

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PUM

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Abstract

The appliance comprises an IC card reader (3) for an operation with an IC card and a power supply (4) for providing a supply voltage (VCC), in particular for the IC card. The appliance comprises further an overload protection circuit (6), which simulates an IC card extraction in case of an overload of the supply voltage. The power supply (4) is then immediately switched off to avoid any damage for the power supply. In a preferred embodiment, the IC card reader (3) is equipped with a card presence switch (2) for indicating to a micro-controller of the appliance, that an IC card has been inserted into the card reader. The micro-controller provides then a control signal for switching on the power supply for the operation with the IC card. The protection circuit (6) is coupled between the supply voltage for the IC card and the signal line of the card presence switch and provides a detection of a short circuit. The protection circuit may comprise a diode, a comparator or a transistor, which switches off the power supply (4) via a logic circuit (IC3).

Description

technical field [0001] The present invention relates to equipment including an IC card reader operated with an IC card. Devices of this type are known, for example, from pay television broadcasting (Pay TV), electronic payments, or financial services. Background technique [0002] IC cards, also known as smart cards, are portable information media about the size of a credit card. In order to exchange data with the various devices, they include IC card controllers, or at least one integrated memory. A portable device of this type is known, for example, from EP-A-0 633 544 . As a general term for such data media, the expression "IC card" will be used throughout this specification. In order to exchange data with each device, the IC card is generally provided with contacts with which the IC card reader comes into mechanical contact so as to make electrical contact. [0003] Communication between IC cards and individual devices with IC card readers is described, for example, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
CPCG06K7/0013G06K7/0086G06K17/00G06F1/26
Inventor 让-皮埃尔·伯廷
Owner INTERDIGITAL CE PATENT HLDG
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