CN101482912A - Card-seeking emission circuit of radio frequency card - Google Patents
Card-seeking emission circuit of radio frequency card Download PDFInfo
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- CN101482912A CN101482912A CNA2008100592598A CN200810059259A CN101482912A CN 101482912 A CN101482912 A CN 101482912A CN A2008100592598 A CNA2008100592598 A CN A2008100592598A CN 200810059259 A CN200810059259 A CN 200810059259A CN 101482912 A CN101482912 A CN 101482912A
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- card
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- radio frequency
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Abstract
The invention relates to a 13.56MHz radio-frequency card card-searching transmitting circuit used for entrance guard. The radio-frequency card card-searching transmitting circuit comprises an antenna and a card-searching transmitting circuit. The card-searching transmitting circuit consists of a matching network, an amplifying circuit, a frequency signal generator and a control circuit, wherein a signal input end of the matching network is connected with the antenna, a signal output end of the matching network is connected with a signal input end of the amplifying circuit, one way of a signal output end of the amplifying circuit is connected with a signal input end of the control circuit and one way of the signal output end of the amplifying circuit is connected with a signal input end of a frequency signal generating circuit. The 13.56MHz radio-frequency card card-searching transmitting circuit of the invention has the advantages that: firstly, providing the 13.56MHz radio-frequency card card-searching transmitting circuit can not only reduce the difficulty for designing a RFID frequency signal transmitting circuit and the possibility for realizing the RFID frequency signal transmitting circuit, but also can reduce the total cost of the system; secondly, the circuit is simple, the transmission power is easy to adjust, and the energy consumption is small; thirdly, card-searching has high accuracy, cannot generate mulfunction and has good stability.
Description
Technical field
The present invention relates to a kind of gate inhibition's of being used for 13.356MHz card-seeking emission circuit of radio frequency card, especially refer to the radio frequency amplitude modulated carrier radiating circuit in a kind of noncontact radio-frequency card read-write equipment, belong to radio frequency card door lock and seek card radiating circuit manufacturing field.
Background technology
13.56MHz the card detection circuit that noncontact radio-frequency card read-write equipment uses generally adopts the infrared external reflection mode.Its weak point: the one, be subjected to ambient light interference, easily produce misoperation; The 2nd, be subjected to the factor affecting such as shape, card face material of card bigger, its accuracy and poor stability; The 3rd, utilize the radio-frequency card base station ic directly to read radio-frequency card information and survey card, not only can increase the average power consumption of entire system, and reduce the serviceable life of system.
Summary of the invention
Purpose of design: avoid the weak point in the background technology, design that a kind of circuit is simple, energy consumption is little, seek the card-seeking emission circuit of radio frequency card of card accuracy height, good stability.
Design proposal: in order to realize above-mentioned purpose of design.The present invention is a simple and easy low-cost AM modulating system and a mission controller, wherein comprises a frequency signal generating means, in order to a stable radio frequency carrier frequency signal to be provided; One amplifying circuit is the transistor frequency-selecting amplifier, is connected in the frequency signal generating means, controlled by this frequency signal, according to the transmit power needs of setting and produce power; One matching network is connected in emitting antenna and amplifying circuit, is made up of bandpass filter, has filtering and impedance matching function, makes the energy of amplifier can effectively pass through transmission antennas transmit; One emitting antenna is connected in matching network, the emission carrier signal; And an ON-OFF control circuit, for radio-frequency (RF) transmitter provides electric energy, when radiating circuit is not worked, ON-OFF control circuit is closed, to reduce system power dissipation.On structural design, the invention provides a kind of 13.56Mhz radio-frequency card and seek card device radio-frequency transmissions circuit, comprising: emitting antenna, matching network, amplifying circuit, frequency signal generating means, control circuit.1, emitting antenna can be shared with other dedicated RF ID read-write chip, reduces the system complex degree.2, matching network comprises bandpass filter, is used for the impedance matching between amplifying circuit and the emitting antenna, and signal energy is effectively launched by antenna.3, amplifying circuit is connected in the frequency signal generating means, provides energy according to required emissive power.This frequency of signal generator is used to produce the radio frequency carrier frequency of required work.4, ON-OFF control circuit is used to control the emission coefficient stand-by power consumption.Its technical scheme: card-seeking emission circuit of radio frequency card, it comprises antenna, seeks the card radiating circuit, the described card radiating circuit of seeking is made of matching network, amplifying circuit, frequency of signal generator and control circuit, the signal input part of matching network connects antenna, the signal output part of matching network connects the signal input part of amplifying circuit, and the signal input part, a tunnel of signal output part one road connection control circuit of amplifying circuit connects the signal input part of frequency signal generating circuit.
The present invention compares with background technology, and the one, not only provide the 13.56Mhz radio-frequency card to seek card device radio-frequency transmissions circuit, can reduce the difficulty of RFID emission of radio frequency signals circuit design and the possibility of realization, can also reduce the whole cost of system; The 2nd, circuit is simple, emissive power is easy to adjust, energy consumption is little; The 3rd, seek card accuracy height, can not produce misoperation, good stability.
Description of drawings
Fig. 1 is the synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 2 is first kind of embodiment synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 3 is second kind of embodiment synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 4 is first kind of Application Example synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 5 is second kind of Application Example synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Embodiment
Embodiment 1: with reference to accompanying drawing 1～3.Card-seeking emission circuit of radio frequency card, it wraps antenna A, seeks the card radiating circuit, the described card radiating circuit of seeking is made of matching network B, amplifying circuit C, frequency of signal generator D and control circuit E, matching network is meant bandpass filtering, the signal input part of matching network B meets antenna A, and the signal output part of matching network B connects the signal input part of amplifying circuit C; Amplifying circuit is meant power tube, and the signal input part, a tunnel of signal output part one road connection control circuit E of amplifying circuit C connects the signal input part of frequency signal generating circuit D, and control circuit is meant that on-off circuit constitutes.Frequency of signal generator is made of resistance, reverser, crystal resonator and electric capacity overlap joint, and an end of its two electric capacity is connected with the two ends of crystal resonator, resistance and reverser respectively, the other end ground connection of two electric capacity; Or the radio frequency carrier frequency of required work is born, produced by MCU to frequency of signal generator by MCU.
Embodiment 2: with reference to accompanying drawing 4.On the basis of embodiment 1, card-seeking emission circuit of radio frequency card and card-seeking detection circuit of radio frequency card constitute the radio frequency card door lock of no reverser and seek the card circuit.
Embodiment 3: with reference to accompanying drawing 5.On the basis of embodiment 1, card-seeking emission circuit of radio frequency card and card-seeking detection circuit of radio frequency card constitute the radio frequency card door lock of reverser and seek the card circuit.
What need understand is: though the foregoing description is to the present invention's detailed explanation of contrasting; but these explanations, just to simple declaration of the present invention, rather than limitation of the present invention; any innovation and creation that do not exceed in the connotation of the present invention all fall within the scope of protection of the present invention.
Claims (6)
1, a kind of card-seeking emission circuit of radio frequency card, its wraps antenna, seeks the card radiating circuit, it is characterized in that: the described card radiating circuit of seeking is made of matching network, amplifying circuit, frequency of signal generator and control circuit, the signal input part of matching network connects antenna, the signal output part of matching network connects the signal input part of amplifying circuit, and the signal input part, a tunnel of signal output part one road connection control circuit of amplifying circuit connects the signal input part of frequency of signal generator.
2, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: matching network is meant bandpass filtering.
3, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: amplifying circuit is meant power tube.
4, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: control circuit is meant power switch circuit.
5, card-seeking emission circuit of radio frequency card according to claim 1, it is characterized in that: frequency of signal generator is made of resistance, reverser, crystal resonator and electric capacity overlap joint, one end of its two electric capacity is connected with the two ends of crystal resonator, resistance and reverser respectively, the other end ground connection of two electric capacity.
6, card-seeking emission circuit of radio frequency card according to claim 1 is characterized in that: the radio frequency carrier frequency of required work is born, produced by MCU to frequency of signal generator by MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100592598A CN101482912A (en) | 2008-01-12 | 2008-01-12 | Card-seeking emission circuit of radio frequency card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100592598A CN101482912A (en) | 2008-01-12 | 2008-01-12 | Card-seeking emission circuit of radio frequency card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101482912A true CN101482912A (en) | 2009-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100592598A Pending CN101482912A (en) | 2008-01-12 | 2008-01-12 | Card-seeking emission circuit of radio frequency card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101482912A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105590074A (en) * | 2014-10-20 | 2016-05-18 | 启碁科技股份有限公司 | Radio frequency identification reader |
| CN105678202A (en) * | 2014-11-20 | 2016-06-15 | 安朗杰安防技术（中国）有限公司 | Radio frequency card detection circuit and detection method thereof |
-
2008
- 2008-01-12 CN CNA2008100592598A patent/CN101482912A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105590074A (en) * | 2014-10-20 | 2016-05-18 | 启碁科技股份有限公司 | Radio frequency identification reader |
| CN105590074B (en) * | 2014-10-20 | 2019-01-15 | 启碁科技股份有限公司 | RFID reader |
| CN105678202A (en) * | 2014-11-20 | 2016-06-15 | 安朗杰安防技术（中国）有限公司 | Radio frequency card detection circuit and detection method thereof |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20090715 |