CN104376289A - Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method - Google Patents
Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method Download PDFInfo
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- CN104376289A CN104376289A CN201410746870.3A CN201410746870A CN104376289A CN 104376289 A CN104376289 A CN 104376289A CN 201410746870 A CN201410746870 A CN 201410746870A CN 104376289 A CN104376289 A CN 104376289A
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Abstract
The invention discloses a low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method. A detection device is composed of a power module, a sine wave generation module, an amplifying and driving module, a radio-frequency sending and receiving module, an echo rectification module, a communication module and a central processing module, and all the modules are connected electrically and sequentially from front to back. Under control of the central processing module, an MW_DET end is enabled, the sine wave generation module emits high-frequency sine wave which is amplified through the amplifying and driving module, the sine wave is sent to a radio-frequency antenna through the radio-frequency sending and receiving module, and electromagnetic wave is formed within a certain spatial range for detecting a radio-frequency card. The method is applicable to contactless radio-frequency communication, in particular to ultra-low power consumption radio-frequency communication, and is used for detecting whether or not the radio-frequency card enters a radio-frequency field in real time. The detection device has the advantages of low cost, long service life, high anti-jamming capability and high working stability.
Description
Technical field
The present invention relates to the instrument radio-frequency card communication technology, specifically a kind of low-power consumption mode Real-Time Monitoring the method for recognizing non-contact type IC card.
Background technology
In low-power-consumption intelligent instrument radio-frequency communication, in order to save battery power, whether current most design proposal all adopts tongue tube close to detect radio-frequency card as physical switch, and tongue tube itself exists contact resistance greatly, and switch is easily shaken, volume is larger, life-span is shorter, high in cost of production shortcoming, and must trigger with the card of carry magnet due to tongue tube, and the easy demagnetization of magnet, therefore have impact on communication effect.
Summary of the invention
The object of the invention is to solve the deficiency adopting tongue tube to bring to radio-frequency card detection technique, Real-Time Monitoring circuit and the method for non-contact IC card under a kind of low-power consumption mode are provided, this circuit adopts frequency electromagnetic waves to detect radio-frequency card, the thin card of non-magnet can be used to trigger, cost is low, life-span is long, and antijamming capability is strong, working stability.
The technical solution used in the present invention is:
The circuit of a kind of Real-Time Monitoring non-contact IC card of system of the present invention, comprises power module, sinusoidal wave generation module, amplify driver module, radio frequency sends and receiver module, echo rectification module, communication module, central processing module, is electrically connected before and after between each module successively.
Each modular circuit structure of the circuit of this Real-Time Monitoring non-contact IC card is as follows:
1. power module.Be made up of lithium battery, filter capacitor and Three-end voltage stabilizer, the direct current that lithium battery exports, after voltage-stabilizing device and filter capacitor, export required DC voltage.
2. sinusoidal wave generation module---be sine wave oscillation circuit, be adopt Pierce oscillator model, be made up of passive quartz crystal oscillator, load capacitance, phase inverter, feedback resistance and current-limiting resistance, be electrically connected between each several part.
Its principle is: crystal oscillator can equivalence become an electric capacity and resistor coupled in parallel to connect the singly-terminal pair of an electric capacity on electrically again, this network has two resonance features, namely the parallel resonance that frequency is higher and the lower series resonance of frequency, in the scope that high and low frequency these two is extremely narrow, crystal oscillator can be equivalent to an inductance, as long as so electric capacity suitable in the two ends parallel connection of crystal oscillator just can form antiresonant circuit.This antiresonant circuit is added in a negative-feedback circuit, just sine wave oscillation circuit can be formed, due to crystal oscillator be equivalent to inductance frequency range very narrow, even if so the Parameters variation of other elements is very large, the frequency of this oscillator also can not vary widely.
3. amplify driver module.
This module adopts the amplitude of logic gates offset of sinusoidal ripple to amplify, and is finally exported with just anti-phase two-way by sine wave.
4. radio frequency sends and receiver module.
By filter inductance, electric capacity, antenna matching electric capacity and radio-frequency antenna composition, be electrically connected between each several part.The high-frequency signal of prime module is transmitted on antenna by this module after overmatching, thus forms electromagnetic field within the scope of certain space, responds to radio frequency card.
5. echo rectification module.
By commutation diode, filter resistance, electric capacity, current-limiting resistance forms, and is electrically connected between each several part.This module is first through overcommutation to the echo sensed, then after carrying out filtering current limliting, signal is outputted to subordinate's module.
6. communication module.
Be made up of radio frequency card reader chip.This module is connected with central processing module by IIC serial communication interface, to be sent and receiver module is connected by radio-frequency field communication interface with radio frequency.
7. central processing module
Form primarily of singlechip chip.The signal of this module to input judges, makes corresponding actions.If card detected, close sinusoidal wave generation module, wake communication module up and carry out communication.There is module and amplify driver module to be connected in this module, is connected, is connected by IIC serial communication interface with communication module by analog input interface with echo rectification module by IO interface and sine wave.
Advantage of the present invention is: eliminate the tongue tube used in tradition inspection card, adopt frequency electromagnetic waves to detect radio-frequency card, and the thin card of non-magnet can be used to trigger, and cost is low, and the life-span is long, and antijamming capability is strong, working stability.
Below in conjunction with the radio-frequency card pick-up unit of drawings and Examples, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the radio-frequency card pick-up unit of the present embodiment;
Fig. 2 is the schematic block circuit diagram of the power module of the present embodiment;
Fig. 3 is that module principle block diagram occurs the sine wave of the present embodiment;
Fig. 4 is the amplification driver module theory diagram of the present embodiment;
Fig. 5 is that the radio frequency of the present embodiment sends and receiver module theory diagram;
Fig. 6 is the echo rectification module theory diagram of the present embodiment;
Fig. 7 is the system operational flow diagram of the present embodiment.
Embodiment
The real-time monitoring device of a kind of non-contact IC card of embodiment
Fig. 1 shows the principle of the present embodiment non-contact IC card detection apparatus.
Power module gives each module for power supply, sinusoidal wave occur module under central processing module controls by sinewave output to amplifying driver module, radio frequency delivery and reception module is outputted to again after amplifying driver module process, thus form the electromagnetic field of radio frequency inspection card, echo rectification module outputs to the analog input interface of central processing module after rectifying and wave-filtering by receiving echo, if through judging to detect that card is marched into the arena, just start communication module to be sent being sent to radio frequency after data encoding and receiver module by radio communication interface, thus realize and the communicating of radio frequency card.
Fig. 7 shows the Dynamic System flow process of the non-contact IC card detection apparatus of the present embodiment:
Start 1.: non-contact IC card detection apparatus powers on, and carries out initialization;
Flow process is 2.: under central processing module controls, enable MW_DET end, and the sinusoidal wave module that occurs is started working, and goes out high_frequency sine wave;
Flow process is 3.: amplify driver module and amplify high_frequency sine wave;
Flow process is 4.: sent by radio frequency and sine wave is sent on radio-frequency antenna by receiver module, forms electromagnetic wave to detect radio frequency card in the certain limit of space;
Flow process is 5.: echo rectification module carries out rectification and filtering to the echo received;
Flow process is 6.: central processing module judges echo, if card is marched into the arena;
Flow process is 7.: close sinusoidal wave sending module;
Flow process is 8.: start communication module and communicate with radio-frequency card, repeat above step after communication.
If card is not marched into the arena, not open communication module, repeats above-mentioned steps and proceeds to detect.
1. power module
Fig. 2 shows the circuit structure principle of the power module of the present embodiment non-contact IC card detection apparatus.
3.6V lithium battery is received J2 socket, and after U3, the 3.3V voltage of stable output is to vdd terminal, for system.C1, C2 play filter action.
2. sinusoidal wave generation module
Fig. 3 shows the structural principle of the sine wave generation module of non-contact IC card detection apparatus.
Quartz crystal oscillator XT2 two ends and on load capacitance C20, C21, just constitute antiresonant circuit, this circuit is received in the feedback circuit be made up of R11 and XOR gate, when DetCon holds enable, wave end is with regard to the sine wave of energy stable output, and R12 plays metering function and prevents crystal oscillator from overdriving.
3. amplify driver module
Fig. 4 shows the structural principle of the amplification driver module of non-contact IC card detection apparatus.
Sinusoidal wave end by wave inputs, and after MW_DET end is enable, TX1, TX2 two ends just can export the sine wave signal of phase 180 °.ANDF0 ~ ANDF2 right and wrong door exports after NAND operation input signal, and XOR1 ~ XOR3 is that XOR gate exports after XOR input signal.
4. radio frequency sends and receiver module
Fig. 5 shows the radio frequency transmission of non-contact IC card detection apparatus and the structural principle of receiver module.
When sine wave is input to TX1, TX2 two ends, inductance L 1, L2 and electric capacity C3, C7 play low-pass filtering effect, C4 ~ C8 is antenna matching electric capacity, electromagnetic field will be formed to respond to card around such antenna, along with the value of antenna electric inductance value different C5, C6, C9, C10 needs adjustment, be generally that inductance is larger, capacitance is less.
5. echo rectification module
Fig. 6 shows the structural principle of the echo rectification module of non-contact IC card detection apparatus.
D1 is commutation diode, plays half-wave rectification effect, resistance R9, and electric capacity C17 plays filter action, and R8 plays metering function.When echo is input to D_RX end, DetCard terminal just can detect that this changes, thus system just reaches the object detecting card.
5. communication module is radio frequency card reader chip.
Its annexation as shown in Figure 1.Be connected with central processing module by IIC serial communication interface, sent with radio frequency by radio-frequency field communication interface and receiver module is connected.
6. central processing module is singlechip chip.
Its annexation as shown in Figure 1.The signal of this module to input judges, makes corresponding actions.If card detected, close sinusoidal wave generation module, wake communication module up and carry out communication.There is module and amplify driver module to be connected in this module, is connected, is connected by IIC serial communication interface with communication module by analog input interface with echo rectification module by IO interface and sine wave.
Claims (9)
1. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode, is characterized in that, comprising: power module, sinusoidal wave module occurs, amplify driver module, radio frequency sends and receiver module, echo rectification module, communication module, central processing module, is electrically connected before and after between each module successively.
2. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode according to claim 1, it is characterized in that: described power module, be made up of lithium battery, filter capacitor and Three-end voltage stabilizer, the direct current that lithium battery exports, exports required DC voltage after voltage-stabilizing device and filter capacitor.
3. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode according to claim 1, it is characterized in that: module occurs described sine wave, system adopts Pierce oscillator model, be made up of passive quartz crystal oscillator, load capacitance, phase inverter, feedback resistance and current-limiting resistance, be electrically connected successively between aforementioned each components and parts.
4. the circuit of low Real-Time Monitoring non-contact IC card according to claim 1, is characterized in that: described amplification driver module, is to adopt the amplitude of logic gates offset of sinusoidal ripple to amplify, and is finally exported with just anti-phase two-way by sine wave.
5. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode according to claim 1, it is characterized in that: described radio frequency sends and receiver module, by filter inductance, electric capacity, antenna matching electric capacity and radio-frequency antenna composition, be electrically connected between aforementioned each components and parts successively.
6. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode according to claim 1, it is characterized in that: described echo rectification module, is characterized in that: by commutation diode, filter resistance, electric capacity, current-limiting resistance forms, and is electrically connected successively between aforementioned each components and parts.
7. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode according to claim 1, it is characterized in that: described communication module, is radio frequency card reader chip; This module is connected with central processing module by IIC serial communication interface, to be sent and receiver module is connected by radio-frequency field communication interface with radio frequency.
8. the circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode according to claim 1, it is characterized in that: described central processing module, is singlechip chip; There is module and amplify driver module to be connected in this module, is connected, is connected by IIC serial communication interface with communication module by analog input interface with echo rectification module by IO interface and sine wave.
9. low-power consumption mode Real-Time Monitoring a recognizing non-contact type IC card method, is characterized in that, carry out according to following step:
Start (1): non-contact IC card detection apparatus powers on, and carries out initialization;
Flow process (2): under central processing module controls, enable MW_DET end, the sinusoidal wave module that occurs is started working, and goes out high_frequency sine wave;
Flow process (3): amplify driver module and high_frequency sine wave is amplified;
Flow process (4): to be sent by radio frequency and sine wave is sent on radio-frequency antenna by receiver module, forms electromagnetic wave to detect radio frequency card in the certain limit of space;
Flow process (5): echo rectification module carries out rectification and filtering to the echo received;
Flow process (6): central processing module judges echo, if card is marched into the arena;
Flow process (7): close sinusoidal wave sending module;
Flow process (8): start communication module and communicate with radio-frequency card, repeat above step after communication;
If card is not marched into the arena, not open communication module, repeats above-mentioned steps and proceeds to detect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410746870.3A CN104376289A (en) | 2014-12-08 | 2014-12-08 | Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method |
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| CN201410746870.3A CN104376289A (en) | 2014-12-08 | 2014-12-08 | Low-power-consumption-mode real-time contactless IC (integrated circuit) card monitoring and identifying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108370257A (en) * | 2015-12-16 | 2018-08-03 | 威里利生命科学有限责任公司 | Transmitter IC for single channel Bluetooth beacon |
| CN109118627A (en) * | 2018-08-15 | 2019-01-01 | 深圳市凯迪仕智能科技有限公司 | A kind of automatic lock control circuit and control method |
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| CN101996448A (en) * | 2009-08-26 | 2011-03-30 | 王依欣 | Application technology of radio-frequency IC MFRC522 to intelligent instrument |
| CN202093535U (en) * | 2011-05-17 | 2011-12-28 | 利尔达科技有限公司 | Low frequency card read-write device |
| CN204270313U (en) * | 2014-12-08 | 2015-04-15 | 西安仓实电子科技有限公司 | The circuit of Real-Time Monitoring non-contact IC card under low-power consumption mode |
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2014
- 2014-12-08 CN CN201410746870.3A patent/CN104376289A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1672388A1 (en) * | 2004-12-20 | 2006-06-21 | St Microelectronics S.A. | Electromagnetic transponder without autonomous energy supply |
| CN201387611Y (en) * | 2008-10-23 | 2010-01-20 | 盛惠珍 | Radio-frequency card reader-writer communication circuit |
| CN101996448A (en) * | 2009-08-26 | 2011-03-30 | 王依欣 | Application technology of radio-frequency IC MFRC522 to intelligent instrument |
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| CN108370257A (en) * | 2015-12-16 | 2018-08-03 | 威里利生命科学有限责任公司 | Transmitter IC for single channel Bluetooth beacon |
| CN108370257B (en) * | 2015-12-16 | 2021-02-02 | 威里利生命科学有限责任公司 | Transmitter IC for single channel Bluetooth beacons |
| CN109118627A (en) * | 2018-08-15 | 2019-01-01 | 深圳市凯迪仕智能科技有限公司 | A kind of automatic lock control circuit and control method |
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Application publication date: 20150225 |