CN101482913A - Radio frequency card door lock circuit - Google Patents
Radio frequency card door lock circuit Download PDFInfo
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- CN101482913A CN101482913A CNA2008100592600A CN200810059260A CN101482913A CN 101482913 A CN101482913 A CN 101482913A CN A2008100592600 A CNA2008100592600 A CN A2008100592600A CN 200810059260 A CN200810059260 A CN 200810059260A CN 101482913 A CN101482913 A CN 101482913A
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- matching network
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- door lock
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Abstract
The invention relates to a 13.356MHz radio-frequency card lock circuit which is used for entrance guard. 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 an 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 card-searching receiving 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 the searching transmitting circuit.
Description
Technical field
The present invention relates to a kind of gate inhibition's of being used for 13.356MHz radio frequency card door lock circuit, especially refer to the radio frequency amplitude modulated carrier sending and receiving apparatus in a kind of noncontact radio-frequency card read-write equipment, belong to radio frequency card door lock 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 to adopt 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 radio frequency card door lock circuit of card accuracy height, good stability.
Design proposal: in order to realize above-mentioned purpose of design.The present invention is low-cost AM modulating system and 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, detecting circuit, crest voltage are extracted circuit, peak voltage signal output.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.5, detecting circuit is connected between matching network and the crest voltage extraction circuit, is made up of the diode detection circuit, is used to extract carrier signal semiperiod signal (positive half period or negative half-cycle).6, crest voltage extraction circuit input end is a detecting circuit, and output terminal is peak voltage signal output, is made up of bandpass filter, removes high-frequency carrier signal, extracts the crest voltage of carrier wave, and input signal is a d. c. voltage signal.Whether the level variable quantity of this peak voltage signal output output can be used for detecting by the noncontact radio-frequency card.Its technical scheme: radio frequency card door lock circuit, it comprises antenna, seeks the card radiating circuit, seeks clamping receipts circuit, Card Reader chip, motor-drive circuit and power supply, 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 described clamping receipts circuit of seeking is made of matching network, detecting circuit, crest voltage extraction circuit and frequency of signal generator, the signal input part of the signal of matching network connects antenna, the signal end, one tunnel of signal output part one road frequency of signal generator of the signal of matching network 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, 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 of radio frequency card door lock frame structure.
Fig. 2 is the synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 3 is first kind of embodiment synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 4 is second kind of embodiment synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 5 is the third embodiment synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Fig. 6 is the 4th kind of embodiment synoptic diagram that radio frequency card door lock is sought the card radiating circuit.
Embodiment
Embodiment 1: with reference to accompanying drawing 1～3.Radio frequency card door lock circuit, it comprises antenna 1, seek card radiating circuit 2, seek clamping and receive circuit 7, Card Reader chip 3, motor-drive circuit 6 and power supply 5, seek card radiating circuit 2 and seek the signal termination antenna 1 that circuit 7 is received in clamping, the signal end of MCU4 connects the signal input part of seeking card radiating circuit 2 respectively, the signal end of the signal input part of motor-drive circuit 6 and Card Reader chip 3, Card Reader chip 3 signal terminations are sought card radiating circuit 2 and are sought the signal end that circuit 7 is received in clamping, and power supply 5 is given MCU4, motor-drive circuit 6, Card Reader chip 3, seek card radiating circuit 2 and seek 7 power supplies of clamping receipts circuit.The described card radiating circuit 2 of seeking is by matching network, amplifying circuit, frequency of signal generator and control circuit constitute, the signal input part of matching network (matching network is meant bandpass filtering) connects antenna, the signal output part of matching network connects the signal input part of amplifying circuit, the signal input part of signal output part one road connection control circuit of amplifying circuit (amplifying circuit is meant power tube) (control circuit is meant that on-off circuit constitutes), one the tunnel connects frequency signal generation electrical equipment, and (frequency of signal generator is by resistance, reverser, crystal resonator and electric capacity overlap joint constitute, one end of its two electric capacity respectively with crystal resonator, the two ends of resistance and reverser connect, the other end ground connection of two electric capacity) signal input part; The described clamping receipts circuit of seeking is made of matching network, detecting circuit, crest voltage extraction circuit and frequency of signal generator, the signal input part of the signal of matching network connects antenna, the signal end, one tunnel of signal output part one road frequency of signal generator of the signal of matching network connects the signal input part of detecting circuit, the signal output part of detecting circuit connects crest voltage extraction circuit, and (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) signal input part, the signal output part that crest voltage is extracted circuit is connected with the interface of seeking the card radiating circuit.Seek the card radiating circuit and seek the clamping receipts shared matching network of circuit and a frequency of signal generator.Detecting circuit is meant diode.
Embodiment 2: with reference to accompanying drawing 4.On the basis of embodiment 1, frequency of signal generator is born, is produced the radio frequency carrier frequency of required work by MCU.
Embodiment 3: with reference to accompanying drawing 5.On the basis of embodiment 1 and 2, crest voltage is extracted signal, the opposing party's signal termination MCU signal end of circuit one signal termination matching network.
Embodiment 4: with reference to accompanying drawing 6.On the basis of embodiment 1 and 2, signal, the opposing party's signal end that crest voltage is extracted circuit one signal termination matching network connect the MCU signal end by comparer.
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 (9)
1, a kind of radio frequency card door lock circuit, it comprises antenna, seeks the card radiating circuit, seeks clamping receipts circuit, Card Reader chip, motor-drive circuit and power supply, 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 signal generating circuit; The described clamping receipts circuit of seeking is made of matching network, detecting circuit, crest voltage extraction circuit and frequency of signal generator, the signal input part of the signal of matching network connects antenna, the signal end, one tunnel of signal output part one road frequency of signal generator of the signal of matching network 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, radio frequency card door lock circuit according to claim 1, it is characterized in that: matching network is meant bandpass filtering.
3, radio frequency card door lock circuit according to claim 1, it is characterized in that: amplifying circuit is meant power tube.
4, radio frequency card door lock circuit according to claim 1 is characterized in that: control circuit is meant that on-off circuit constitutes.
5, radio frequency card door lock circuit 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, radio frequency card door lock circuit 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.
7, radio frequency card door lock circuit 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.
8, radio frequency card door lock circuit according to claim 1 is characterized in that: seek the card radiating circuit and seek the clamping receipts shared matching network of circuit and a frequency of signal generator.
9, radio frequency card door lock circuit according to claim 1, it is characterized in that: detecting circuit is meant diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100592600A CN101482913A (en) | 2008-01-12 | 2008-01-12 | Radio frequency card door lock circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100592600A CN101482913A (en) | 2008-01-12 | 2008-01-12 | Radio frequency card door lock circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101482913A true CN101482913A (en) | 2009-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100592600A Pending CN101482913A (en) | 2008-01-12 | 2008-01-12 | Radio frequency card door lock circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101482913A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103093161A (en) * | 2011-10-28 | 2013-05-08 | 成都高新区尼玛电子产品外观设计工作室 | Radio frequency identification devices (RFID) antenna and signal same-source dual-functional system |
| 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 |
| CN109389724A (en) * | 2018-10-12 | 2019-02-26 | 深圳市沃特沃德股份有限公司 | The smart lock and its method for preventing signal interference from unlocking |
-
2008
- 2008-01-12 CN CNA2008100592600A patent/CN101482913A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103093161A (en) * | 2011-10-28 | 2013-05-08 | 成都高新区尼玛电子产品外观设计工作室 | Radio frequency identification devices (RFID) antenna and signal same-source dual-functional system |
| 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 |
| CN109389724A (en) * | 2018-10-12 | 2019-02-26 | 深圳市沃特沃德股份有限公司 | The smart lock and its method for preventing signal interference from unlocking |
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| PB01 | Publication | ||
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Open date: 20090715 |