CN101482914A - Card-seeking detection circuit of radio frequency card - Google Patents
Card-seeking detection circuit of radio frequency card Download PDFInfo
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- CN101482914A CN101482914A CNA2008100592634A CN200810059263A CN101482914A CN 101482914 A CN101482914 A CN 101482914A CN A2008100592634 A CNA2008100592634 A CN A2008100592634A CN 200810059263 A CN200810059263 A CN 200810059263A CN 101482914 A CN101482914 A CN 101482914A
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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
The present invention relates to a kind of gate inhibition's of being used for 13.356MHz card-seeking detection circuit of radio frequency card, refer to that especially the radio frequency amplitude modulated carrier in a kind of noncontact radio-frequency card read-write equipment detects receiving circuit, belong to radio-frequency card and seek card circuit manufacturing field.
Background technology
13.56MHz the card detection circuit that noncontact radio-frequency card read-write equipment uses is generally in 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 chip 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 detection circuit of radio frequency card of card accuracy height, good stability.
Design proposal: in order to realize above-mentioned purpose of design.The invention provides a kind of 13.56Mhz card-seeking detection circuit of radio frequency card, comprising: A emitting antenna, B filter impedance match circuit (abbreviation matching network), C detecting circuit, D crest voltage are extracted circuit, the output of E peak voltage signal, F radio-frequency carrier generator (abbreviation frequency of signal generator).
This emitting antenna A links to each other with filter impedance match circuit B and launches the carrier signal that radio-frequency carrier generating means F provides.
This matching network B comprises low-pass filter, is used for the impedance matching between radio-frequency carrier generator F and the emitting antenna A, and signal energy is effectively launched by antenna.
This detecting circuit C is connected in matching network B and crest voltage is extracted between the circuit D, is made up of the diode detection circuit, is used to extract carrier signal semiperiod signal (positive half period or negative half-cycle).
It is detecting circuit C that this crest voltage is extracted circuit D input end, and output terminal is peak voltage signal output E.Be made up of low-pass filter, remove high-frequency carrier signal, extract the crest voltage of carrier wave, input signal is a d. c. voltage signal.
Whether the level variable quantity of this peak voltage signal output E output can be used for detecting by the noncontact radio-frequency card.Radio-frequency carrier generating means F is in order to provide the radio frequency carrier frequency signal of firm power.
This emitting antenna can be shared with other dedicated RF ID read-write chip, reduces the system complex degree.Emitting antenna A is connected in matching network, whether has the noncontact radio-frequency card near being used to launch carrier signal and induction antenna.Peak voltage signal output E is connected with interface in the card-seeking emission circuit of radio frequency card.
Technical scheme: card-seeking detection circuit of radio frequency card, it comprises antenna, seek the card testing circuit, the described card testing circuit of seeking is by matching network, detecting circuit, crest voltage extracts circuit and frequency of signal generator constitutes, the signal input part of the signal of matching network connects antenna, the signal end of signal output part one road frequency of signal generator of the signal of matching network, one the tunnel connects the signal input part of detecting circuit, the signal output part of detecting circuit connects the signal input part that crest voltage is extracted circuit, and the signal output part that crest voltage is extracted circuit is connected with the interface of seeking the card radiating circuit.
The present invention compares with background technology, and the one, the whole cost of reduction system; The 2nd, receiving sensitivity can be adjusted as required; The 3rd, overcome existing use special chip and carried out the noncontact radio-frequency card and seek the too high problem of card power consumption, energy consumption is little; The 4th, circuit is simple, emissive power is easy to adjust; The 5th, searching is surveyed accurately, can not produced misoperation, good stability.
Description of drawings
Fig. 1 is the synoptic diagram that radio frequency card door lock is sought the card testing circuit.
Fig. 2 is first kind of embodiment synoptic diagram that radio frequency card door lock is sought the card testing circuit.
Fig. 3 is second kind of embodiment synoptic diagram that radio frequency card door lock is sought the card testing circuit.
Fig. 4 is the third embodiment synoptic diagram that radio frequency card door lock is sought the card testing circuit.
Fig. 5 is the 4th kind of embodiment synoptic diagram that radio frequency card door lock is sought the card testing circuit.
Embodiment
Embodiment 1: with reference to attached Fig. 1 and 2.Card-seeking detection circuit of radio frequency card, it comprises antenna A, seek the card testing circuit, the described card testing circuit of seeking is by matching network B, detecting circuit C, crest voltage extracts circuit D and frequency of signal generator F constitutes, matching network is meant bandpass filtering, the signal input part of the signal of matching network B meets antenna A, the signal end of signal output part one road frequency of signal generator F of matching network B, one the tunnel connects the signal input part of detecting circuit C, detecting circuit C is meant diode, the signal output part of detecting circuit C connects the signal input part that crest voltage is extracted circuit D, and the signal output part that crest voltage is extracted circuit D is connected with the interface of seeking the card radiating circuit.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, or frequency of signal generator is born, is produced the radio frequency carrier frequency of required work by MCU.
Embodiment 2: with reference to accompanying drawing 3.Described crest voltage is extracted circuit and is made of the output termination capacitor of diode, an end of resistance and the input end of comparer, the other end ground connection of electric capacity, resistance diode, electric capacity and resistance; Or the output termination capacitor of diode, an end of resistance and the signal end of MCU, the other end ground connection of electric capacity, resistance.
Embodiment 3: with reference to accompanying drawing 4.On the basis of embodiment 1 and 2, 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 4: with reference to accompanying drawing 5.On the basis of embodiment 1 and 2, 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 detection circuit of radio frequency card, it comprises antenna, seek the card testing circuit, it is characterized in that: the described card testing circuit of seeking is by matching network, detecting circuit, crest voltage extracts circuit and frequency of signal generator constitutes, the signal input part of the signal of matching network connects antenna, the signal end of signal output part one road frequency of signal generator of the signal of matching network, one the tunnel connects the signal input part of detecting circuit, the signal output part of detecting circuit connects the signal input part that crest voltage is extracted circuit, and the signal output part that crest voltage is extracted circuit is connected with the interface of seeking the card radiating circuit.
2, card-seeking detection circuit of radio frequency card according to claim 1, it is characterized in that: matching network is meant bandpass filtering.
3, card-seeking detection 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.
4, card-seeking detection circuit of radio frequency card according to claim 1 is characterized in that: frequency of signal generator is born, is produced the radio frequency carrier frequency of required work by MCU.
5, card-seeking detection circuit of radio frequency card according to claim 1, it is characterized in that: described crest voltage is extracted circuit and is made of diode, electric capacity and resistance, the output termination capacitor of diode, an end of resistance and the input end of comparer, the other end ground connection of electric capacity, resistance; Or the output termination capacitor of diode, an end of resistance and the signal end of MCU, the other end ground connection of electric capacity, resistance.
6, card-seeking detection circuit of radio frequency card according to claim 1, it is characterized in that: detecting circuit is meant diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100592634A CN101482914A (en) | 2008-01-12 | 2008-01-12 | Card-seeking detection circuit of radio frequency card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100592634A CN101482914A (en) | 2008-01-12 | 2008-01-12 | Card-seeking detection circuit of radio frequency card |
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| Publication Number | Publication Date |
|---|---|
| CN101482914A true CN101482914A (en) | 2009-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100592634A Pending CN101482914A (en) | 2008-01-12 | 2008-01-12 | Card-seeking detection circuit of radio frequency card |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310170A (en) * | 2012-03-16 | 2013-09-18 | 上海复旦微电子集团股份有限公司 | RFID (Radio Frequency Identification Device) card reader for identifying card entrance by non-responding manner and identification method |
| CN103679097A (en) * | 2013-12-05 | 2014-03-26 | 江门市联创发展有限公司 | Micro-power radio frequency card ubiquitous detection system |
| CN103810451A (en) * | 2013-12-20 | 2014-05-21 | 利尔达科技集团股份有限公司 | Radio frequency card detection device and radio frequency card detection method thereof |
-
2008
- 2008-01-12 CN CNA2008100592634A patent/CN101482914A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310170A (en) * | 2012-03-16 | 2013-09-18 | 上海复旦微电子集团股份有限公司 | RFID (Radio Frequency Identification Device) card reader for identifying card entrance by non-responding manner and identification method |
| CN103679097A (en) * | 2013-12-05 | 2014-03-26 | 江门市联创发展有限公司 | Micro-power radio frequency card ubiquitous detection system |
| CN103679097B (en) * | 2013-12-05 | 2017-01-18 | 江门市联创发展有限公司 | Micro-power radio frequency card ubiquitous detection system |
| CN103810451A (en) * | 2013-12-20 | 2014-05-21 | 利尔达科技集团股份有限公司 | Radio frequency card detection device and radio frequency card detection method thereof |
| CN103810451B (en) * | 2013-12-20 | 2017-01-04 | 利尔达科技集团股份有限公司 | Radio frequency card detection apparatus and radio-frequency card detection method thereof |
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Open date: 20090715 |