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A carrier signal detection conversion circuit

A technology for converting circuits and carrier signals, applied in the electronic field, can solve problems affecting equipment functions, unfavorable application system versatility, and magnetic card damage

Active Publication Date: 2018-10-30
ANHUI HIGHWELL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is necessary to add a corresponding magnetic induction switch for the card reader, which greatly limits the versatility of the card and the card reader, which is not conducive to the versatility of the application system
Due to the strong magnet inside the card, when the card and the magnetic card are placed together, the magnetic card will be damaged
At the same time, the card reader part also needs to be antimagnetic. For the application of magnetic induction sensor equipment, such as electronic water meters, the magnetic field of the card will affect the sensor and affect the function of the equipment.

Method used

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  • A carrier signal detection conversion circuit

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Embodiment Construction

[0019] The present invention will be described in further detail below according to the drawings and embodiments.

[0020] refer to figure 1 , the present invention, the carrier signal detection and conversion circuit is used for the processing of separating the data signal returned by the card from the radio frequency carrier signal.

[0021] The carrier signal detection conversion circuit includes a DC signal isolation circuit and a voltage change comparison circuit.

[0022] The DC signal isolation circuit is composed of the coupling capacitor C3, which realizes the function of direct-current isolation and communication of the circuit signal, and transmits the variation of the radio frequency carrier signal to the voltage variation comparison circuit.

[0023] The voltage change comparison circuit is composed of a comparison reference voltage circuit and a two-stage voltage comparison circuit. Resistors R1 and R3 form a voltage divider circuit. A suitable reference voltage...

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Abstract

The invention discloses a carrier signal detection conversion circuit, comprising: a DC signal isolation circuit, a voltage change comparison circuit, the DC signal isolation circuit transfers the change amount of the radio frequency signal returned by the RF card to the voltage change comparison circuit; the DC signal isolation circuit includes Coupling capacitor C3, the coupling capacitor C3 transmits the change of the radio frequency signal returned by the RF card to the voltage change comparison circuit, and the voltage change comparison circuit includes a comparison reference voltage circuit, a first-stage voltage comparison circuit, and a second-stage voltage comparison circuit. The beneficial effect of the present invention lies in the processing for separating the data signal returned by the card from the radio frequency carrier signal.

Description

technical field [0001] The invention relates to a carrier signal detection conversion circuit, which is mainly applied in the field of electronic technology. Background technique [0002] For traditional contact smart cards such as magnetic cards and contact IC cards, the identification device (also called a card reader) needs to be in contact with the smart card before reading and writing operations can be performed on the smart card. The radio frequency card is also called the RF smart card. The reading device can identify the smart card and transmit data through wireless transmission without contact with the smart card, so as to realize the reading and writing operation of the smart card. [0003] The basic principle of radio frequency card work is: [0004] The RF reader sends a set of fixed-frequency electromagnetic waves to the IC card. There is an IC series resonant circuit in the card, whose frequency is the same as the frequency emitted by the reader. In this way, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B5/00
CPCH04B5/77
Inventor 蔡昕汪青山刘春
Owner ANHUI HIGHWELL ELECTRONICS