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Equipment with contact type IC (Integrated Circuit) card slot and contact type IC protective circuit

A protection circuit and contact technology, which is applied to record carriers used in machines, instruments, computer parts, etc., can solve the problems of IC card abnormal status, failure to work, and failure to work normally, so as to avoid abnormal status and simple structure Effect

Active Publication Date: 2012-12-12
FUZHOU ROCKCHIP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the contact IC card needs to be in physical contact with the card reader, during the hot swap process, the IC card status is abnormal and cannot work
One of the most common situations is that the data line contacts the card reader before the power line, and the current from the card reader will flow directly from the data port to the IC card, causing the IC card to fail to reset (initialize) normally. It is in an abnormal state and cannot work normally

Method used

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  • Equipment with contact type IC (Integrated Circuit) card slot and contact type IC protective circuit
  • Equipment with contact type IC (Integrated Circuit) card slot and contact type IC protective circuit

Examples

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Embodiment Construction

[0021] The structure of the contact IC card protection circuit according to the preferred embodiment of the present invention will be described below with reference to the accompanying drawings. Wherein the labeling of element in the embodiment is consistent with the labeling of 2 in the accompanying drawing, and appended figure 2 The component number in represents the name of this kind of component.

[0022] as attached figure 1 , the contact IC card protection circuit of the present invention comprises a first delay circuit 1, a second delay circuit 3, a first switch 2 and a second switch 4, the input terminal of the first switch 2 is connected to a power supply, and the output terminal is used for Connect the power supply terminal 202 of the IC card, the control terminal is connected to the output terminal of the first delay circuit 1, the input terminal of the first delay circuit 1 is connected to the detection pin of the card reader, and the second switch 4 is a bidirec...

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Abstract

The invention discloses equipment with a contact type IC (Integrated Circuit) card slot and a contact type IC protective circuit. The contact type IC protective circuit comprises two groups of time-delay circuits and two groups of switches. A first switch is controlled by an output through the delay of a first time delay circuit when cards are inserted into the card slot. When the switch is conducted, the cards are connected to an external power supply. Then a second switch is controlled through the delay of a second time delay circuit, so that a data bus of the cards is connected to a mainly-controlled data bus and the cards and a main computer start normal communication. Through two stages of time delay circuits, the safety and normal communication of the cards can be effectively protected.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a device with a contact IC card slot and a contact IC card protection circuit. Background technique [0002] Integrated circuit card (i.e. IC card) is a kind of mobile storage medium that appeared after the magnetic card. It is widely used because of its advantages of convenient storage, good security and confidentiality, long service life, and easy to carry and use. [0003] The core of an IC card is an integrated circuit chip, which uses modern advanced microelectronics technology to embed a large-scale integrated circuit chip in a small plastic card. According to the communication mode between the IC card and the card reader, the IC card can be divided into two types: non-contact IC card and contact IC card. The non-contact IC card communicates with the card reader through wireless communication, and the non-contact IC card does not need to be directly physically connected with the car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/073
Inventor 洪锦坤
Owner FUZHOU ROCKCHIP SEMICON
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