CN106066974A - A kind of low power consumption, RF card is without switch inspection card device - Google Patents
A kind of low power consumption, RF card is without switch inspection card device Download PDFInfo
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- CN106066974A CN106066974A CN201610369688.XA CN201610369688A CN106066974A CN 106066974 A CN106066974 A CN 106066974A CN 201610369688 A CN201610369688 A CN 201610369688A CN 106066974 A CN106066974 A CN 106066974A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0095—Testing the sensing arrangement, e.g. testing if a magnetic card reader, bar code reader, RFID interrogator or smart card reader functions properly
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- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
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Abstract
The invention discloses a kind of low power consumption, RF card and examine card device without switch, including: emission of radio frequency signals circuit, radio-frequency transmissions reception antenna, rf signal reception circuit, card detection signal processing circuit, carrier signal tesing and switching circuit.The beneficial effects of the present invention is, eliminate the detection switch of the strong magnet in card and card reader portion, it is possible to use the card of any pattern coordinates with card reader.
Description
Technical field
The present invention relates to a kind of low power consumption, RF card and examine card device without switch, be mainly used in electronic technology field.
Background technology
Traditional contact intelligent card such as magnetic card, Contact Type Ic Card, identify that equipment (also referred to as card reader) needs and intelligence
Can contact by card, then smart card could be written and read operation.Radio-frequency card is also called RF smart card, recognizing apparatus with smart card
In the case of not coming in contact, can by the way of being wirelessly transferred identification intelligent card transmit data, thus realize intelligence
The read-write operation of card.
The ultimate principle of radio-frequency card work is:
Frequency read/write sends out the electromagnetic wave of one group of fixed frequency to IC-card, has an IC series resonant circuit in card, its
The frequency that frequency is launched with read write line is identical, and so under excitation of electromagnetic wave, LC resonance circuit produces resonance, so that in electric capacity
There is electric charge；At the other end of this electric charge, it is connected to the electric charge pump of an one-way conduction, the electric charge in electric capacity is delivered to another
Capacitor memory stores up, and when the electric charge accumulated reaches working condition, this electric capacity can be other circuit offer work electricity as power supply
Data in card are launched or accept the data of read write line by pressure.
In actual applications, owing to card does not contacts with card reader, therefore, card reader can not be according to traditional insertion detection
Mode is made whether that card needs the detection of read-write.At present, most Non-contact radio-frequency card uses two ways to carry out
Card detects, and a kind of is card reader transmission radio frequency Card Reader signal regularly, when there is effective card in the radio-frequency field of card reader
Time, card have receive correct Card Reader signal after can send the data in card, card reader judges according to the data that receive
Whether there is effective card, complete card detection operation.Another kind is to carry out by the way of magnetic switch, and this needs at card
The a piece of strong magnet of interior placement, installs a Magnetic testi switch, when card is placed near card reader, in card in card reader
Strong magnet can cause Magnetic testi switch motion, card reader judges whether card according to this operating state switched, complete
Become detection operation.
Both the above inspection card mode, first kind of way needs when launching electromagnetic wave and read-write card data due to card reader
Consume bigger source current, commonly reach 10mA.This method is not suitable for the most battery powered system of low-power dissipation system
Uniting, it can greatly shorten the service life of battery, and for card operation system the most frequently, most power supply energy disappears
Consumption is in the detection of card, and this is a kind of unnecessary waste.
Examining card mode for the second, because card needs built-in strong magnet, this can increase requirement for card making, as
Card needs the most customized, and the thickness of card needs to increase, and the position of Magnet needs to coordinate with card reader.Additionally for card reader
Being also required to increase corresponding magnetic induction switch, this has the biggest restriction for the versatility of card and card reader, is unfavorable for application system
The versatility of system.Owing to there being strong magnet in card, magnetic card can be caused damage when card and magnetic card put together.Simultaneously to reading
Card device part is also required to make anti-magnetic treatment, for using magnetic induction sensor equipment, such as the application of electronic water meter, the magnetic field of card
Sensor can be produced impact, affect the function of equipment.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low power consumption, RF card and examines card device without switch, above-mentioned to solve
Technical problem.
The present invention is achieved through the following technical solutions.
A kind of low power consumption, RF card examines card device without switch, including:
Emission of radio frequency signals circuit, sends data carrier and the switch oscillating of energy-activation for card reader to RF card；
Radio-frequency transmissions reception antenna, for receiving the signal of emission of radio frequency signals circuit, it is achieved and the data between RF card
Electromagnetic field conversion with energy transmission and resonance；
Rf signal reception circuit, for receiving the radiofrequency signal returned from RF card, process when inspection card simultaneously with or without
The energy storage of card；
Card detection signal processing circuit, for the radiofrequency signal that detection RF card returns being processed, reaches to process
Device carries out the requirement signal of software judgement；
Carrier signal tesing and switching circuit, including direct current signal isolate circuit, change in voltage comparison circuit, direct current signal every
The variable quantity of the radiofrequency signal returned by RF card from circuit is delivered to change in voltage comparison circuit.
Further, emission of radio frequency signals circuit includes that switch triode Q2, switch triode Q3, resistance R5, circuit limit
Leakage resistance RA1, circuit current-limiting resistance RA2, processor control interface RFTx, switch triode Q2, switch triode Q3 parallel connection sets
Putting, circuit current-limiting resistance RA1, circuit current-limiting resistance RA2 are connected with switch triode Q2, switch triode Q3 respectively, work as needs
When sending signal, processor controls interface RFTx by processor and controls switch triode Q2, switch triode through resistance R5
Q3 switchs according to the mid frequency of radio-frequency card.
Further, radio-frequency transmissions reception antenna includes radio-frequency transmissions reception antenna L1, resonant capacitance C4, and processor passes through
Processor controls interface RFTx and controls switch triode Q2, the switch triode Q3 mid frequency according to radio-frequency card through resistance R5
Switch, L1 produces vibration and sends electromagnetic wave, radio-frequency transmissions reception antenna L1 and common group of resonant capacitance C4 to space
Become identical with card frequency of oscillation resonant tank.
Further, radio-frequency transmissions reception antenna also includes load resistance R6, for the load balance of rf oscillation signal.
Further, rf signal reception circuit includes diode D1, electric capacity C5, resistance R7, and radio frequency is sent out by diode D1
Charging to electric capacity C5 after penetrating the circuit signal energy rectification that reception antenna produces, electric capacity C5 and resistance R7 forms discharge loop, will
Circuit signal is converted into the voltage signal that processor can detect.
Further, card detection signal processing circuit include resistance R4, resistance R4 by the detection port of processor with penetrate
Frequently signal receiving circuit connects.
Further, direct current signal isolation circuit includes coupling electric capacity C3, the radio frequency that RF card is returned by coupling electric capacity C3
The variable quantity of signal is delivered to change in voltage comparison circuit, change in voltage comparison circuit include comparison reference voltage circuit, first
Step voltage comparison circuit, second level voltage comparator circuit；
Comparison reference voltage circuit includes that resistance R1, resistance R3, electric capacity C2, resistance R1 and resistance R3 dividing potential drop adjust and is closed
Suitable reference voltage, the reference voltage obtained is decoupled by electric capacity C2；
First order voltage comparator circuit includes comparator U1B, resistance R10, resistance R8, electric capacity C8, and R10 is by alternating current buckling
The central point changing signal moves reference voltage Com to, and when input voltage changes, the signal being input to comparator U1B the 5th foot can be
Fluctuation near reference voltage Com, comparator U1B detects that this fluctuates, and according to the input signal height relation relative to Com from
7th foot output switching signal, controls R8 and electric capacity C8 composition capacitance-resistance charge-discharge circuit and carries out discharge and recharge；
Second level voltage comparator circuit includes capacitance C7, comparator U1A, resistance R11, resistance R9, and resistance R11 will hand over
The central point of stream voltage change signal moves reference voltage Com to, when input voltage changes, is input to comparator U1A the 3rd foot
Signal can fluctuate near reference voltage Com, and comparator U1A detects that this fluctuates, and according to the input signal height relative to Com
The steady state voltage of output is pulled upward to supply voltage from the 1st foot output switching signal, resistance R9 by low relation.
Further, low power consumption, RF card also includes low-power dissipation power supply management switch circuit without switch inspection card device, is used for
The power supply of Card Reader part is switched.
Further, low-power dissipation power supply management switch circuit includes switching Q1, resistance R2, electric capacity C1, and processor is according to reading
The job requirement of card device circuit controls the switch of switching tube Q1, and resistance R2 ensures that Q1 is held off when processor does not export,
Electric capacity C1 provides high frequency decoupling loop for power supply.
Beneficial effects of the present invention:
Use the low power consumption, RF card of the present invention without switch inspection card device, eliminate the strong magnet in card and card reader portion
The detection switch divided, it is possible to use the card of any pattern coordinates with card reader, simultaneously because card reader portion need not install
Detection switchs, and the placement location of antenna arbitrarily can be placed according to the needs of product, and without the concern for magnetic field for product
The impact of other function.Simultaneously by the cooperation of software function, can accomplish that super low-power consumption does not affect Detection results, for low merit
The application of consumption product particularly battery-powered products eliminates battery cost, beneficially energy-conserving and environment-protective greatly.
Accompanying drawing explanation
Fig. 1 is the overall structure frame diagram of the present invention；
Fig. 2 is the integrated circuit schematic diagram of the present invention；
Fig. 3 is the circuit diagram of the emission of radio frequency signals circuit of the present invention；
Fig. 4 is the circuit diagram of the rf signal reception circuit of the present invention；
Fig. 5 is the circuit diagram of the card detection signal processing circuit of the present invention；
Fig. 6 is the circuit diagram of the carrier signal tesing and switching circuit of the present invention；
Fig. 7 is the circuit diagram of the low-power dissipation power supply management switch circuit of the present invention.
Detailed description of the invention
Below according to drawings and Examples, the present invention is described in further detail.
With reference to Fig. 1, Fig. 2, the present invention, low power consumption, RF card without switch inspection card device, including:
Emission of radio frequency signals circuit, sends data carrier and the switch oscillating of energy-activation for card reader to RF card；
Radio-frequency transmissions reception antenna, for receiving the signal of emission of radio frequency signals circuit, it is achieved and the data between RF card
Electromagnetic field conversion with energy transmission and resonance；
Rf signal reception circuit, for receiving the radiofrequency signal returned from RF card, process when inspection card simultaneously with or without
The energy storage of card；
Card detection signal processing circuit, for the radiofrequency signal that detection RF card returns being processed, reaches to process
Device carries out the requirement signal of software judgement；
Carrier signal tesing and switching circuit, including direct current signal isolate circuit, change in voltage comparison circuit, direct current signal every
The variable quantity of the radiofrequency signal returned by RF card from circuit is delivered to change in voltage comparison circuit.
With reference to Fig. 3, emission of radio frequency signals circuit sends data carrier and energy-activation for realizing card reader to card
Switch oscillating.
Emission of radio frequency signals circuit includes that switch triode Q1, switch triode Q2, circuit current-limiting resistance RA1, circuit limit
Leakage resistance RA2, processor control interface RFTx.Processor is according to the switch of the control realization rf excitation signal of software and frequency
Control.When needs send signal, processor controls audion Q1, Q2 according to radio-frequency card by RFTx port through resistance R5
Mid frequency switchs, and produces vibration, utilize the inductance characteristic of L1 to send electromagnetic wave to space on L1.It is being made without
Close excitation when read-write card processes to control, to save electrical source consumption.
Radio-frequency transmissions reception antenna L1 changes and resonance for the electromagnetic field of the data between realization and card and energy transmission.
Radio-frequency transmissions reception antenna L1 and resonant capacitance C4 collectively constitutes the resonant tank identical with card frequency of oscillation.
Load resistance R6, for the load balance of rf oscillation signal, prevents self-oscillation.
Radio-frequency transmissions reception antenna L1 completes the conversion of signal carrier and energy under the control of emission of radio frequency signals circuit
Transmission, is converted into electromagnetic field signal by on-off circuit signal.
With reference to Fig. 4, rf signal reception circuit is for receiving the reception of the radiofrequency signal returned from card, simultaneously at inspection card
Time process have cardless energy to store.
The circuit that radio-frequency transmissions reception antenna and resonant capacitance produce is believed by rf signal reception circuit by diode D1
Charge to electric capacity C5 after number energy rectification, it is achieved the detection reception function of radio-frequency carrier signal.Electric capacity C5 and resistance R7 composition is put
Electricity loop, is converted into the voltage signal that processor can detect by circuit signal.
With reference to Fig. 5, card detection signal processing circuit, for the return signal of detection card being processed, reaches to process
Device carries out the requirement signal of software judgement.
Card detection signal processing circuit is by resistance R4 by the detection port of processor with rf signal reception circuit even
Connect, according to the analysis of trend of card detection signal, processor determines whether that card is in the radio-frequency field of card reader.
With reference to Fig. 6, the data signal that carrier signal tesing and switching circuit is used for returning card is from radio-frequency carrier signal
The process separated.
Carrier signal tesing and switching circuit includes direct current signal isolation circuit and change in voltage comparison circuit.
Direct current signal isolation circuit is formed by coupling electric capacity C3, it is achieved the function every straight-through friendship of circuit signal, by radio frequency
The variable quantity of carrier signal is delivered to change in voltage comparison circuit.
Change in voltage comparison circuit is made up of comparison reference voltage circuit and two-stage voltage comparator circuit, resistance R1 and R3 group
Becoming voltage branch circuit, adjusted by dividing potential drop and obtain suitable reference voltage, the reference voltage obtained is decoupled by electric capacity C2,
Strengthen the stability of reference voltage.
First order voltage comparator circuit is made up of comparator U1B and resistance R10 and resistance R8 and electric capacity C8, and R10 will hand over
The central point of stream voltage change signal moves reference voltage Com to, when input voltage changes, is input to the signal meeting of U1B the 5th foot
Fluctuating near reference voltage Com, comparator U1B detects that this fluctuates, and according to the input signal height relation relative to Com
From the 7th foot output switching signal, control R8 and C8 composition capacitance-resistance charge-discharge circuit and carry out discharge and recharge, thus obtain a change width
Spend the biggest voltage signal, it is achieved the effect small exchange varying component of input amplified.
Second level voltage comparator circuit is made up of capacitance C7, comparator U1A and resistance R11 and resistance R9, and R11 will
The central point of alternating voltage variable signal moves reference voltage Com to, when input voltage changes, is input to the signal of U1A the 3rd foot
Can fluctuate near reference voltage Com, comparator U1A detects that this fluctuates, and closes according to the input signal height relative to Com
System is from the 1st foot output switching signal, and the steady state voltage of output is pulled upward to supply voltage by resistance R9, it is ensured that input not having signal
Time the stablizing of output signal.
With reference to Fig. 7, low-power dissipation power supply management switch circuit for realizing the on and off switch of Card Reader part, reach with
Open, save electrical source consumption.
Low-power dissipation power supply management switch circuit is realized by switch mosfet Q1, and processor is wanted according to the work of card reader circuit
Seeking the switch controlling switch Q1, resistance R2 ensures that Q1 is held off when processor does not export, and electric capacity C1 provides height for power supply
Frequency decoupling loop, it is ensured that the stability of working power.Just turn on the power switch when the division of labor of needs card-reading part is made, close electricity at ordinary times
Source switch is to save electrical source consumption.
The present invention, timing is sent the electromagnetic wave signal of very short time by emission of radio frequency signals circuit, and is believed by radio frequency
Number receive circuit and card detection signal processing circuit to feedback card detection signal judge, when the radio-frequency field of card reader
When inside there is card, the energy of card sector-meeting electromagnetic wave absorption, the variation tendency of detection signal can be accelerated.Software section detects this
Processed by calculating after individual variation tendency and determine whether card, when card having been detected, the reading of a card can be carried out again
Write operation, opens carrier signal tesing and switching circuit simultaneously and processes the signal received, when reading correct card letter
After breath, then carry out the card read-write operation of complete function.Carrying out a card detection in the most per second, do so both may be used
Card to be detected timely, it is also possible to realize reducing the purpose of power consumption.
Process in software function at detection card, be also added into function is dynamically processed for the change in detection signal time.When
During the changes in environmental conditions that circuit works, the transformation period of detection signal can fluctuate up and down in meansigma methods, adds and dynamically processes merit
After energy, for transformation period calculating can adjust dynamically according to the change of meansigma methods, decrease to a greater extent for
The probability of card error detection.Simultaneously for by the dynamic process of software, it is possible to judge whether card leaves radio-frequency field, according to
Functional requirement is not repeated to process for the card not leaving radio-frequency field, reduces the read-write number of times of card, extends the use of card
In the life-span, also it is effectively reduced the electrical source consumption of system simultaneously.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow and is familiar with this art
Personage will appreciate that present invention and is carried out, and can not limit the scope of the invention with this.All according to the present invention
The equivalence that spirit is made changes or modifies, and all should contain within the scope of the present invention.
Claims (9)
1. a low power consumption, RF card is without switch inspection card device, it is characterised in that including:
Emission of radio frequency signals circuit, sends data carrier and the switch oscillating of energy-activation for card reader to RF card；
Radio-frequency transmissions reception antenna, for receiving the signal of emission of radio frequency signals circuit, it is achieved and the data between RF card and energy
The electromagnetic field conversion of amount transmission and resonance；
Rf signal reception circuit, for receiving the radiofrequency signal returned from RF card, processes with or without card when inspection card simultaneously
Energy storage；
Card detection signal processing circuit, for the radiofrequency signal that detection RF card returns being processed, reaches processor and enters
The requirement signal that row software judges；
Carrier signal tesing and switching circuit, isolates circuit, change in voltage comparison circuit, direct current signal isolation electricity including direct current signal
The variable quantity of the radiofrequency signal that RF card returns is delivered to change in voltage comparison circuit by road.
Low power consumption, RF card the most according to claim 1 is without switch inspection card device, it is characterised in that emission of radio frequency signals electricity
Road includes switch triode Q2, switch triode Q3, resistance R5, circuit current-limiting resistance RA1, circuit current-limiting resistance RA2, processor
Control interface RFTx, switch triode Q2, switch triode Q3 is arranged in parallel, circuit current-limiting resistance RA1, circuit current-limiting resistance
RA2 is connected with switch triode Q2, switch triode Q3 respectively, and when needs send signal, processor is controlled by processor
Interface RFTx controls switch triode Q2, switch triode Q3 through resistance R5 and switchs according to the mid frequency of radio-frequency card.
Low power consumption, RF card the most according to claim 2 is without switch inspection card device, it is characterised in that radio-frequency transmissions receives sky
Line includes radio-frequency transmissions reception antenna L1, resonant capacitance C4, and processor controls interface RFTx by processor and controls through resistance R5
Switch triode Q2 processed, switch triode Q3 switch according to the mid frequency of radio-frequency card, produce vibration to space on L1
Sending electromagnetic wave, radio-frequency transmissions reception antenna L1 and resonant capacitance C4 collectively constitutes the resonance identical with card frequency of oscillation and returns
Road.
Low power consumption, RF card the most according to claim 1 is without switch inspection card device, it is characterised in that radio-frequency transmissions receives sky
Line also includes load resistance R6, for the load balance of rf oscillation signal.
Low power consumption, RF card the most according to claim 1 is without switch inspection card device, it is characterised in that rf signal reception electricity
Road includes diode D1, electric capacity C5, resistance R7, the circuit signal energy rectification that radio-frequency transmissions reception antenna is produced by diode D1
Backward electric capacity C5 charges, and electric capacity C5 and resistance R7 forms discharge loop, and circuit signal is converted into the electricity that processor can detect
Pressure signal.
Low power consumption, RF card the most according to claim 1 is without switch inspection card device, it is characterised in that at card detection signal
Reason circuit includes that the detection port of processor is connected by resistance R4, resistance R4 with rf signal reception circuit.
Low power consumption, RF card the most according to claim 1 is without switch inspection card device, it is characterised in that direct current signal isolation electricity
Road includes coupling electric capacity C3, and it is more electric that the variable quantity of the radiofrequency signal that RF card is returned by coupling electric capacity C3 is delivered to change in voltage
Road, change in voltage comparison circuit includes that comparison reference voltage circuit, first order voltage comparator circuit, second level voltage ratio are more electric
Road；
Comparison reference voltage circuit includes that resistance R1, resistance R3, electric capacity C2, resistance R1 and resistance R3 dividing potential drop adjust and obtains suitably
Reference voltage, the reference voltage obtained is decoupled by electric capacity C2；
First order voltage comparator circuit includes comparator U1B, resistance R10, resistance R8, electric capacity C8, and R10 is by alternating voltage change letter
Number central point move reference voltage Com to, when input voltage changes, the signal being input to comparator U1B the 5th foot can be in reference
Fluctuation near voltage Com, comparator U1B detects that this fluctuates, and according to the input signal height relation relative to Com from the 7th
Foot output switching signal, controls R8 and electric capacity C8 composition capacitance-resistance charge-discharge circuit and carries out discharge and recharge；
Second level voltage comparator circuit includes capacitance C7, comparator U1A, resistance R11, resistance R9, and resistance R11 is by alternating current
The central point of pressure variable signal moves reference voltage Com to, when input voltage changes, is input to the signal of comparator U1A the 3rd foot
Can fluctuate near reference voltage Com, comparator U1A detects that this fluctuates, and closes according to the input signal height relative to Com
System is from the 1st foot output switching signal, and the steady state voltage of output is pulled upward to supply voltage by resistance R9.
Low power consumption, RF card the most according to claim 1 without switch inspection card device, it is characterised in that low power consumption, RF card without
Switch inspection card device also includes low-power dissipation power supply management switch circuit, for switching the power supply of Card Reader part.
Low power consumption, RF card the most according to claim 8 is without switch inspection card device, it is characterised in that low-power dissipation power supply manages
On-off circuit includes switching Q1, resistance R2, electric capacity C1, and processor controls switching tube Q1's according to the job requirement of card reader circuit
Switch, resistance R2 ensures that Q1 is held off when processor does not export, and electric capacity C1 provides high frequency decoupling loop for power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369688.XA CN106066974A (en) | 2016-05-25 | 2016-05-25 | A kind of low power consumption, RF card is without switch inspection card device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610369688.XA CN106066974A (en) | 2016-05-25 | 2016-05-25 | A kind of low power consumption, RF card is without switch inspection card device |
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| CN106066974A true CN106066974A (en) | 2016-11-02 |
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| CN201610369688.XA Pending CN106066974A (en) | 2016-05-25 | 2016-05-25 | A kind of low power consumption, RF card is without switch inspection card device |
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| CN106059632A (en) * | 2016-05-25 | 2016-10-26 | 安徽汉威电子有限公司 | Carrier signal detection conversion circuit |
| CN106096471A (en) * | 2016-08-09 | 2016-11-09 | 安徽汉威电子有限公司 | A kind of low power consumption, RF card is without switch inspection card system |
| CN109034285A (en) * | 2018-10-24 | 2018-12-18 | 深圳市创自技术有限公司 | Recycle card sender |
| CN109492443A (en) * | 2018-11-27 | 2019-03-19 | 北京千方科技股份有限公司 | A kind of reader power calibrating method and power calibration method |
| CN110855383A (en) * | 2019-11-22 | 2020-02-28 | 徐慧 | Signal amplitude measuring system for slow change in local space |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106096471A (en) * | 2016-08-09 | 2016-11-09 | 安徽汉威电子有限公司 | A kind of low power consumption, RF card is without switch inspection card system |
| CN109034285A (en) * | 2018-10-24 | 2018-12-18 | 深圳市创自技术有限公司 | Recycle card sender |
| CN109034285B (en) * | 2018-10-24 | 2023-12-08 | 深圳市创自技术有限公司 | Circulation card sender |
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| CN109492443B (en) * | 2018-11-27 | 2022-05-24 | 北京千方科技股份有限公司 | Reader-writer power calibration method and power calibration method |
| CN110855383A (en) * | 2019-11-22 | 2020-02-28 | 徐慧 | Signal amplitude measuring system for slow change in local space |
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Application publication date: 20161102 |