CN102231182B - Radio frequency induction lock and reading card module - Google Patents
Radio frequency induction lock and reading card module Download PDFInfo
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- CN102231182B CN102231182B CN201010238624.9A CN201010238624A CN102231182B CN 102231182 B CN102231182 B CN 102231182B CN 201010238624 A CN201010238624 A CN 201010238624A CN 102231182 B CN102231182 B CN 102231182B
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Abstract
The invention discloses a radio frequency induction lock and a reading card module. The reading card module comprises the following parts: a microprocessor used for outputting carrier wave signal of a specific frequency and processing received data signal; a resonance circuit used for generating a sine damping attenuation signal which is in resonance with the carrier wave signal; an antenna used for radiating the sine damping attenuation signal to air to activating a passive card and receiving a data signal fed back by the passive card; a demodulation circuit used for carrying out demodulation processing on the data signal received by the antenna; a filter circuit used for carrying out filtering processing on the data signal after demodulation; a amplification circuit used for carrying out power amplification on the data signal after demodulation and filtering, and transmitting the data signal to the microprocessor. According to the invention, by selecting cheap electronic components and micro processing chip, combined with reasonable circuit and feasible program, same technical effect of a special-purpose base station chip is realized.
Description
[technical field]
The present invention relates to a kind of radio frequency induction lock that is applied to the occasions such as hotel, hotel, high-end residential community, relate in particular to card reading module wherein.
[technical background]
On home market, the technology that the card reading module of radio frequency induction lock produces carrier wave is monopolized by external forerunner, technological core mainly rests in U.S. ATMEL and Switzerland EMI two company's hands, the special IC (private base station chip) that the model that the special IC (private base station chip) that the model that the former produces is U2270B and the latter produce is EM4095 all can be realized card-reading function, and be all operated on 125KHz frequency, occupy at present most domestic and international markets.
Obviously, the result of monopolization causes the height enterprise of product price, also causes thus state internal lock industry manufacturer's manufacturing cost can not to be in any more, and, due to the underproductiving of aforementioned two companies, the normal supply shortage phenomenon that occurs, has had a strong impact on the normal production of the relevant industries that depend on these chips.
Although highly integrated circuit has its convenient part, bring manufacturing cost raising and produce on supply falls short of demand, obviously do not meet market discipline.
Technically, the barrier that the patent of Gai Liang company earlier application forms and the complicacy of integrated circuit high integration have affected adding of domestic colleague, therefore, the special IC that direct research and development voluntarily can produce 125KHz carrier signal had both belonged to the duplication of labour, did not also meet the competition requirement in market.Tend in the industry find a kind of lower cost solution of alternative such special IC.
[summary of the invention]
Object of the present invention is just being to provide a kind of card reading module of radio frequency induction lock, strives for realizing and having the equal technique effect of known technology with lower cost;
Another object of the present invention is to provide a kind of radio frequency induction lock, its cost is reduced relatively, and the function realizing is constant.
For realizing this object, the present invention adopts following technical scheme:
The card reading module of radio frequency induction lock of the present invention, comprising: microprocessor, for exporting the carrier signal of characteristic frequency and processing the data-signal receiving; Resonant circuit, for generation of with the sinusoidal damping vibration attenuation signal of this carrier signal phase resonance; Antenna, for to this sine damping vibration attenuation signal of aerial radiation to activate passive card, and receive the data-signal of passive card feedback; Detecting circuit, for carrying out detection processing to the data-signal of antenna reception; Filtering circuit, carries out filtering processing for the data-signal to after detection; Amplifying circuit, carries out power amplification for the data-signal to after detection filter, to be transferred to described microprocessor.
Concrete, between described resonant circuit and microprocessor, be serially connected with the resistance (R14) for current limliting.Described resonant circuit comprises inductance (ANT1) and electric capacity (C8), and this inductance (ANT1) uses as described antenna simultaneously.
Preferably, this module also comprises a negative circuit, is serially connected with between amplifying circuit and microprocessor for carrying out anti-phase to the data-signal after amplifying.
For reducing costs, described resonant circuit, detecting circuit, filtering circuit, amplifying circuit or negative circuit comprise at least one electronic devices and components.Described microprocessor is singlechip chip.
For adding strong adaptability, the frequency of the carrier signal of described microprocessor output is defined as 125KHz.
For ease of realizing, described microprocessor is its timer port for the port of exporting characteristic frequency carrier signal.
Radio frequency induction lock of the present invention, comprises aforesaid card reading module and passive card, and carrier signal of card reading module transmission is used for activating passive card work and to card reading module feedback data signal, card reading module is further processed this data-signal.
Compared with prior art, tool of the present invention has the following advantages: the present invention is simple in structure, be easy to realize, by adopting the economical product of single-chip microcomputer in conjunction with known electronic devices and components (diode, triode, resistance, inductance and electric capacity etc.) and so on, can realize the function equal with external private base station chip in conjunction with the program design for single-chip microcomputer, not only overcome the harsh shortcoming of working condition, also greatly reduce production cost, radio frequency induction lock based on radio-frequency technique and the holistic cost of corresponding miscellaneous equipment are reduced greatly.
[brief description of the drawings]
Fig. 1 is the circuit diagram of the card reading module of the radio frequency induction lock of the primary embodiment of the present invention;
Fig. 2 is the circuit diagram of the card reading module of the radio frequency induction lock of another embodiment of the present invention.
[embodiment]
Below in conjunction with drawings and Examples, the present invention is further illustrated:
Consult Fig. 1, it shows the circuit structure of the card reading module of radio frequency induction lock of the present invention, be applied in known radio frequency induction lock, activate passive card by this card reading module to aerial radiation carrier signal, passive card in cycle regular hour realize the reading and writing data between self and card reading module by data-signal being fed back to card reading module, realize thus non-contact signal between card reading module and passive card mutual.
The singlechip chip that the model that the microprocessor of Fig. 1 adopts Philips company to produce is 87LPC767, its I/O mouth supports low level to drive, and supports to fill with current drives.Adapt to this this card reading module of characteristics design, this card reading module is made up of this microprocessor and current-limiting resistance, resonant circuit, antenna, detecting circuit, filtering circuit, amplifying circuit and negative circuit etc.
Microprocessor is integrated with corresponding program, for producing a square wave carrier signal that frequency is 125KHz by its timer port (being labeled as P0.7).
Current-limiting resistance R14 one end is connected with the timer port of microprocessor, and the other end is connected with resonant circuit, plays metering function.Described resonant circuit is made up of the inductance ANT1 being connected in series with current-limiting resistance R14 and capacitor C 8, capacitor C 8 other end ground connection.Suitably adjust the resistance value of inductance ANT1 and choose suitable capacitor C 8, can make the LC series resonant circuit forming thus in the time that frequency is 125KHz, reach resonance, thereby the sinusoidal damping vibration attenuation carrier signal that generation frequency is 125KHz, process inductance ANT1 is to aerial radiation to activate passive card.
As can be seen here, inductance ANT1, except forming series resonant circuit with capacitor C 8 is common, also independently takes on antenna to realize mutual effect with passive card.This antenna not only has the function of the carrier signal producing to aerial radiation microprocessor, and the data-signal of feedback after can be used for receiving passive card and being activated.
The data-signal receiving by antenna ANT1 is detected circuit and further processes, detecting circuit is by detector diode D3, D4, current-limiting resistance R13 and capacitor C 3 form jointly, are demodulated the faint electromagnetic wave receiving from antenna ANT1 and are demodulated the data-signal from passive card by detecting circuit.Data-signal after demodulated is further by the filtering circuit filtering clutter interference being jointly made up of resistance R 17 and C9, then, filtered data-signal is amplified by an amplifying circuit, this amplifying circuit is made up of jointly coupling capacitance C7, current-limiting resistance R18, first order amplifying triode P3 and biasing resistor R19 thereof and R20, data-signal after this filtering is amplified to suitable size by amplifying circuit, further processes to offer microprocessor.
The I/O mouth of the 87LPC767 singlechip chip that adaptation microprocessor is selected is supported the characteristic that low level drives, utilize an anti-phase triode N1 will after anti-phase the data-signal after amplifying, to be just transferred to the P0.5 port of microprocessor as negative circuit, can carry out Manchester code decoding by sending microprocessor to from the data-signal of passive card sheet, so that the corresponding status command of the final output of microprocessor is to implement further control.
The collection of illustrative plates recording according to oscillograph shows, the card reading module of the present embodiment is in 100KHz～150KHz frequency range, and specifically near 125KHz time, the emissive power of antenna ANT1 reaches maximal value.
Visible, because adopting cheap electronic devices and components and singlechip chip, the present invention substitutes current private base station chip on the market, can make based on this kind of card reading module comprise radio frequency induction in being locked in the cost of series products be minimized, the market competitiveness is promoted thus.
Fig. 2 has further disclosed another embodiment of the present invention, it is different from last embodiment part and is: the single-chip microcomputer that the model that the microprocessor of the present embodiment has adopted AVR company to produce is ATMEGA8, its I/O mouth characteristic is to support high level to drive, support to draw current drives, therefore, omitted the negative circuit that last embodiment discloses.
Although in the embodiment that Fig. 2 discloses, the label of electronic devices and components and concrete connectivity port title are slightly different, do not affect those skilled in the art's reading, and in this embodiment, circuit theory is still same as last embodiment, not unconventional connotation of the present invention.
In sum, the present invention selects cheap electronic devices and components and micro-chip processor in conjunction with reasonably circuit and feasible program have realized the technique effect equal with private base station chip jointly.
Above embodiment is only in order to illustrate the present invention and unrestricted technical scheme described in the invention, therefore, although this instructions has been described in detail the present invention with reference to each above-mentioned embodiment, but, those of ordinary skill in the art should be appreciated that still and can modify or be equal to replacement the present invention; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. a card reading module for radio frequency induction lock, is characterized in that, it comprises:
Microprocessor, is singlechip chip, and it supports low level to drive or high level drives, and for export the carrier signal of characteristic frequency by its timer port, and processes the data-signal receiving;
Resonant circuit, for generation of with the sinusoidal damping vibration attenuation signal of this carrier signal phase resonance, this resonant circuit comprises an inductance (ANT1) and an electric capacity (C8) of series connection, described electric capacity (C8) one end ground connection;
Between described resonant circuit and microprocessor, be serially connected with the resistance (R14) for current limliting, described carrier signal, from microprocessor output, is transferred to described resonant circuit through current-limiting resistance (R14);
Antenna, for to this sine damping vibration attenuation signal of aerial radiation to activate passive card, and receive the data-signal of passive card feedback;
Detecting circuit, for the data-signal of antenna reception is carried out to detection processing, described detecting circuit comprises the first diode (D3), the second diode (D4), a current-limiting resistance (R13) and an electric capacity (C3), wherein, described the second diode (D4) and current-limiting resistance (R13) series connection, guide described data-signal to input described microprocessor; Second diode (D4) of described series connection and current-limiting resistance (R13) are in parallel with described the first diode (D3) and electric capacity (C3); Described the first diode (D3) is contrary with the second diode (D4) closure;
Filtering circuit, carries out filtering processing for the data-signal to after detection, and this filtering circuit comprises an electric capacity (C9) and a resistance (R17) in parallel, this filtering circuit one end ground connection;
Amplifying circuit, for the data-signal after detection filter is carried out to power amplification, to be transferred to described microprocessor, this amplifying circuit comprises a coupling capacitance (C7), a current-limiting resistance (R18) and a first order amplifying triode (P3) of series connection; Also comprise the first biasing resistor (R19) and the second biasing resistor (R20) that are used to described first order amplifying triode (P3) that bias voltage is provided, wherein, described the first biasing resistor (R19) is connected with described first order amplifying triode (P3), and described the second biasing resistor (R20) is in parallel with described first order amplifying triode (P3).
2. the card reading module of radio frequency induction lock according to claim 1, is characterized in that: the inductance (ANT1) of described resonant circuit uses as described antenna simultaneously.
3. the card reading module of radio frequency induction lock according to claim 1, is characterized in that: this module also comprises a negative circuit, is serially connected with between amplifying circuit and microprocessor for carrying out anti-phase to the data-signal after amplifying.
4. according to the card reading module of the radio frequency induction lock described in any one in claims 1 to 3, it is characterized in that: the frequency of the carrier signal of described microprocessor output is defined as 125KHz.
5. a radio frequency induction lock, comprise card reading module and passive card, it is characterized in that, described card reading module adopts as the card reading module as described in any one in claim 1 to 4, and card reading module sends that a carrier signal is used for activating passive card work and to card reading module feedback data signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010238624.9A CN102231182B (en) | 2010-07-28 | 2010-07-28 | Radio frequency induction lock and reading card module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010238624.9A CN102231182B (en) | 2010-07-28 | 2010-07-28 | Radio frequency induction lock and reading card module |
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| CN102231182A CN102231182A (en) | 2011-11-02 |
| CN102231182B true CN102231182B (en) | 2014-08-27 |
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| CN201010238624.9A Active CN102231182B (en) | 2010-07-28 | 2010-07-28 | Radio frequency induction lock and reading card module |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102938084B (en) * | 2012-11-29 | 2016-08-24 | 深圳市华旭科技开发有限公司 | The reading/writing method of the low-frequency radio frequency card of intellectual water meter and circuit |
| CN108233939A (en) * | 2016-12-15 | 2018-06-29 | 重庆川仪自动化股份有限公司 | A kind of Manchester code coding method and 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 |
| CN113962235A (en) * | 2021-10-27 | 2022-01-21 | 维沃移动通信有限公司 | RFID card reading circuit and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251165Y (en) * | 1995-10-18 | 1997-04-02 | 广州市金创电子有限公司 | Radio-frequency non-contact identifier for vehicles |
| CN201017327Y (en) * | 2007-04-05 | 2008-02-06 | 田靖 | Wireless radio frequency recognizing card reading device |
| CN202033757U (en) * | 2010-07-28 | 2011-11-09 | 广东顶固集创家居股份有限公司 | Radio frequency induction lock and card-reading module thereof |
-
2010
- 2010-07-28 CN CN201010238624.9A patent/CN102231182B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2251165Y (en) * | 1995-10-18 | 1997-04-02 | 广州市金创电子有限公司 | Radio-frequency non-contact identifier for vehicles |
| CN201017327Y (en) * | 2007-04-05 | 2008-02-06 | 田靖 | Wireless radio frequency recognizing card reading device |
| CN202033757U (en) * | 2010-07-28 | 2011-11-09 | 广东顶固集创家居股份有限公司 | Radio frequency induction lock and card-reading module thereof |
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| CN102231182A (en) | 2011-11-02 |
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