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Card-seeking detection circuit of radio frequency card

A technology of card detection and radio frequency card, which is applied in the direction of instruments, inductive recording carriers, computer components, etc., can solve the problems of poor accuracy and stability, reduce the service life of the system, and easily cause malfunctions, etc., and achieve good stability and launch The power is easy and will not produce the effect of false action

Inactive Publication Date: 2009-07-15
LIERDA SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages: First, it is affected by the interference of ambient light, which is prone to misoperation; second, it is greatly affected by factors such as the shape of the card and the surface material of the card, and its accuracy and stability are poor; third, it uses the radio frequency card chip to directly read the radio frequency Card information is used to detect cards, which will not only increase the overall average power consumption of the system, but also reduce the service life of the system

Method used

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  • Card-seeking detection circuit of radio frequency card
  • Card-seeking detection circuit of radio frequency card
  • Card-seeking detection circuit of radio frequency card

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: with reference to attached figure 1 and 2 . The radio frequency card seeks card detection circuit, and it comprises antenna A, seeks card detection circuit, and described seeks card detection circuit is made of matching network B, wave detection circuit C, peak voltage extraction circuit D and frequency signal generator F, and matching network refers to Band-pass filtering, the signal input terminal of the signal of the matching network B is connected to the antenna A, the signal output terminal of the matching network B is connected to the signal terminal of the frequency signal generator F, and the signal input terminal of the detection circuit C is connected to the signal input terminal of the detection circuit C. The detection circuit C refers to a diode , the signal output terminal of the detection circuit C is connected to the signal input terminal of the peak voltage extraction circuit D, and the signal output terminal of the peak voltage extractio...

Embodiment 2

[0019] Embodiment 2: with reference to attached image 3 . The peak voltage extraction circuit is composed of a diode, a capacitor and a resistor. The output terminal of the diode is connected to one end of the capacitor and the resistor and the input terminal of the comparator, and the other end of the capacitor and the resistor is grounded; or the output terminal of the diode is connected to the capacitor and the resistor. One end and the signal end of the MCU, the other end of the capacitor and resistor are grounded.

Embodiment 3

[0020] Embodiment 3: with reference to attached Figure 4 . On the basis of Embodiments 1 and 2, the radio frequency card seeking card transmitting circuit and the radio frequency card seeking card detecting circuit constitute a radio frequency card door lock seeking card circuit without an inverter.

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PUM

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Abstract

The invention relates to a 13.56MHz radio-frequency card card-searching detection circuit which is used for entrance guard and comprises an antenna and a card-searching detection circuit. The card-searching detection circuit consists of a matching network, a detection circuit, a spike voltage extract circuit and a frequency signal generator, wherein a signal input end of a signal of the matching network is connected with the antenna, one way of a signal output end of the signal of the matching network is connected with a signal end of the frequency signal generator, and one way of the signal output end of the signal of the matching network is connected with a signal input end of the detection circuit, a signal output end of the detection circuit is connected with a signal input end of the spike voltage extract circuit, and a signal output end of the spike voltage extract circuit is connected with an interface of a card-searching transmitting circuit. The 13.56MHz radio-frequency card card-searching detection circuit of the invention has the advantages that: firstly, the total cost of the system is reduced; secondly, the reception sensitivity can be adjusted as required; thirdly, the 13.56MHz radio-frequency card card-searching detection circuit overcomes the problem that in prior art using the dedicated chip to process non-contact radio-frequency card card-searching needs high power consumption, and has small energy consumption; fourthly, the 13.56MHz radio-frequency card card-searching detection circuit has simple circuit and the transmission power is easy to adjust; fifthly, card-searching has accurate detection, cannot generate mulfunction and has good stability.

Description

technical field [0001] The invention relates to a 13.356MHz radio frequency card seeking detection circuit for access control, in particular to a radio frequency amplitude modulation carrier detection receiving circuit in a non-contact radio frequency card reading and writing device, which belongs to the field of radio frequency card seeking circuit manufacturing. Background technique [0002] The card detection circuit used by the 13.56MHz non-contact radio frequency card reading and writing equipment generally uses infrared reflection. Its disadvantages: First, it is affected by the interference of ambient light, which is prone to misoperation; second, it is greatly affected by factors such as the shape of the card and the surface material of the card, and its accuracy and stability are poor; third, it uses the radio frequency card chip to directly read the radio frequency Using card information to detect cards will not only increase the overall average power consumption o...

Claims

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Application Information

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IPC IPC(8): G06K7/00G06K17/00
Inventor 王薪宇梁源贾灵王鲁克
Owner LIERDA SCI & TECH GRP