CN1036115A - Electronic data communications system - Google Patents
Electronic data communications system Download PDFInfo
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- CN1036115A CN1036115A CN 88102775 CN88102775A CN1036115A CN 1036115 A CN1036115 A CN 1036115A CN 88102775 CN88102775 CN 88102775 CN 88102775 A CN88102775 A CN 88102775A CN 1036115 A CN1036115 A CN 1036115A
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Abstract
A kind of data communication system that is used for non-contact data transmission between station and portable data transaction card, wherein contain two be tuned to resonant circuits.Data card passes through the induction coupling slave station received power of two resonant circuits, and utilizes the loaded circuit that the card resonant circuit is loaded in card that the data transmission is arrived at a station, thereby by mutual induction, there are the data in the card in the resonant circuit of standing response.Card also contains a reading circuit that is comprising pulse generator, and this reading circuit produces a pulse when the power that is received by the card resonant circuit interrupts, reset then.Therefore, the mode that the data of utilizing response to be transmitted are shaken station resonant circuit detuning is sent to card with the data slave station, and the pulse as a result that will produce in card at last is translated as the data that transmitted.
Description
The invention relates to electronic data communications system, specifically, is about realize the system of noncontact two-way communication between a station and portable data card.Non-contact communication system do not require that portable data card inserts and arrives at a station, but when data card very when standing, the transmission that promptly produces data.Existing people proposed this data communication system, and at for example secrecy system, fields such as banking business treatment system are applied.
United States Patent (USP) 3,299 424(Vinding) discloses a kind of interrogation responsor recognition system, and answering machine is identified when answering machine and inquisitor are responded to coupling mutually in this system.This induction coupling be in answering machine and inquisitor, utilize be tuned to two resonant circuits of same frequency realize, therefore can make the two contactless communication.
In preferred embodiments, answering machine is self-powered, and the method that a part of inquisitor signal that utilization obtains induction carries out rectification obtains its direct current supply voltage.
Inquisitor utilizes demodulation or loaded circuit, is coupled by a conversion equipment and answering machine, reads or identify the data that exist in this answering machine.Data according to storage start conversion equipment, so that load the answering machine resonant circuit, thereby have reduced interaction between itself and the inquisitor resonant circuit.Therefore, answering machine is to the different load operation of inquisitor resonant circuit, can carry out conversion according to the data of answering machine, for example, a signal that corresponds to the answering machine data can utilize the amplitude or the phase modulation method of the resonant frequency signal of inquisitor to send to inquisitor.
Yet the disclosed system of Vinding wherein carries out self-powered answering machine by inquisitor transmission signal and sends data to inquisitor, but the measure that is write data by inquisitor to answering machine is not provided.
United States Patent (USP) 4,517,563(Diamant) disclose a kind of similar above the recognition system of described Vinding, one of them active answering machine (a kind of fixing reader) is read the data in the memory that is stored in a passive answering machine (a kind of portable identifier).Communicating by letter between reader and the identifier is to utilize the tuning resonant circuit in above-mentioned reader and the identifier to realize, therefore can not take place to realize communication under the situation of physics contact between the two.Portable identifier is not equipped the power supply of itself, but the power supply that leans on the induction coupling between the resonant circuit of two answering machines to produce comes work.Therefore, Diamant also discloses a kind of like this system, and wherein power supply is sent to identifier by reader, and data send to reader from identifier.Yet, the measure that is transmitted data by reader to identifier is not provided.
At United States Patent (USP) 4,605, a kind of computer-controlled data communication system is disclosed in 844(Haggan), in this system, power supply and data can transmit by induction to portable cards from fixing reader, and in addition, data can also transmit to reader from card.Two-way transmission power supply and data are to utilize three other transformer coils of branch that are arranged in reader and the card between reader and card, when card and reader place very near the time, realize by the coupling of the induction between them.Therefore, this device allows two-way communication between reader and card, but other transformer of branch that transmits with each bearing data that this device needs that coupling power transmits.In addition, because the intrinsic bad induction of this system is coupled, therefore have only when placing very closely with fixing reader portable cards, this device could be worked.
The purpose of this invention is to provide a kind of between station and portable data transactions card contactless bi-directional data transfer system, this system has overcome some or all shortcoming of the various systems that are correlated with that proposed up to now.
According to a kind of data communication system that non-contact data transmits that carries out between station and portable data card provided by the invention, wherein the station comprises with the lower part:
One be tuned to the station resonant circuit of first signal and one be used for detecting the demodulator that is superimposed upon the secondary signal on first signal.
Wherein the portable data transaction card comprises with the lower part:
A card resonant circuit, this circuit produce the induction coupling with the station, thereby slave station receive power in response to the station resonant circuit, and,
Be designed to card datel circuit by the power power supply of above-mentioned reception, so that the card resonant circuit is loaded, thereby use in response to the secondary signal that is stored in first data in the card datel circuit and modulate first signal, utilize above-mentioned induction coupling, first data are sent from card arrive at a station;
It is characterized in that wherein also comprising with the lower part:
In the station one logical promise plaited straw of station data penalize the fluffy τ cheat of a form of address for old woman stand up mortar collection ㄐ promise plaited straw divide the male humorous reed of tool to arrest the female apricot ︸ of the silly scar ⑼ ü shelves of silly respectful plaited straw coffee バ to scold the silly respectful plaited straw coffee バ of uncommon hoop ㄐ silly
Reading circuit in data card comprises with the lower part:
A pulse-generator circuit that is coupled to the card resonant circuit is used to produce a pulse, with in response to card the predetermined variation of power supply that resonant circuit was received, and,
One is coupled to pulse generating circuit and in response to the data converter of above-mentioned pulse, thereby the output of data converter is corresponding to above-mentioned second data.
It would be desirable that the resonant circuit of standing is a high Q value crystal control tuning circuit, the card resonant circuit is a lc circuit, stand with block between by being arranged on effective mutual coupling of antenna realization on station and the portable data card.What link to each other with the station resonant circuit is a frequency divider, and the output signal of this frequency divider plays a kind of effect of carrier wave, and this carrier wave is used for the power width of cloth is mapped to the card resonant circuit, and this carrier wave can carry out amplitude modulation by the data-signal that obtains from the card resonant circuit.Demodulator has used a bipolar junction transistor, and this transistor has played the effect that AC amplifier and wave detector combine.This transistorized base stage feed-in modulated carrier signal produces demodulated signal at its emitter.Be superimposed upon above the demodulated signal is that this ripple signal utilizes band pass filter to give filtering corresponding to the lower high-frequency ripple signal of a kind of amplitude of carrier signal.The output signal of filter is accurately corresponding to the data of sending from portable data card.
The datel circuit of standing comprises the device that changes the frequency divider frequency dividing ratio, thereby produces the frequency shift (FS) of carrier signal, arranges frequency displacement like this, and the voltage induced that also is about to be substantially zero is to the card resonant circuit.Utilize this device, the state of card resonant circuit can be made amendment according to the data in the datel circuit that is stored in the station.
The card datel circuit includes a data converter and data memory, and they can drive by the power of station resonant circuit radiation and the electric energy of being responded to by the card resonant circuit that intercouples.Data converter is suitable for basis data-signal of content generation by the data at once of the memory of radiovoltaic generator power drive.Loaded circuit by data converter control is arranged to the logic zero data that sends in response to data converter, effectively short circuit card resonant circuit.Because the mutually effect of coupling, the resonant circuit that the loading effect of second resonant circuit is arrived at a station, and the modulation of the data-signal that causes portable data card carrier signal that the station resonant circuit is produced.
Reading circuit comprises the capacitance-resistance timing network of connecting with a diode network, by this diode network capacitor charging.When the card resonant circuit stopped slave station resonant circuit reception power, the voltage on the capacitor discharged.When the datel circuit at station sends logic zero data, above-mentioned capacitor will discharge.When power up (logical one), because the very little time constant of di-cap network, the capacitor of reading circuit almost just is filled immediately.The rising of this voltage is read by data converter, and this data converter is fit to produce again the data that transmit at the station.
Stand and block between data transmit to be two-way and to be to utilize electromagnetic coupled realization between station and the card.This technology has avoided installing separately transformer coil (as advise in the prior art, please see above) adapting to the transmission of slave station to the power that blocks on station and card, the transmission of simultaneous adaptation data between the two.In addition,, do not need to resemble the system that utilizes transformer to be coupled, card and station must be leaned on very near, just can carry out the transmission of power and data effectively owing in station and card, utilized the resonant circuit of high Q value.
The embodiment that the present invention is applied to a kind of portable data transactions card system is described with reference to the accompanying drawings.Wherein:
The block diagram of Fig. 1 system that to be principle ground expression be made up of a fixed station and portable data processing card;
Fig. 2 is the partial circuit diagram at station;
Fig. 3 is the partial circuit diagram of data processing card;
Fig. 4 is the diagrammatic representation of the DC voltage waveform of rectification in the data processing card;
Fig. 5 is the diagrammatic representation of the voltage-reactance characteristic of card resonant circuit;
Fig. 6 a, 6b, 6c are the diagrammatic representations that is used for from the suitable communication protocol that snaps into station data transmission;
Fig. 7 is the diagrammatic representation of the voltage-frequency characteristic of station resonant circuit;
Fig. 8 a and 8b are the diagrammatic representations of the input and output voltage waveform of card datel circuit;
Fig. 9 a and 9b are used for the diagrammatic representation of slave station to the suitable communication protocol of card data transmission.
As shown in Figure 1, this system comprises that fixed station 1(constitutes active asking-answer machine) and portable data processing card 2(constitute passive asking-answer machine) fixed station 1 comprises radio-frequency oscillator 3, this oscillator produces the resonant circuit that a radiofrequency signal also is fed to a station of amplification detector 4(formation that is coupled with resonant circuit 5).The output of amplification detector 4 is fed to band pass filter 6 and is fed to the datel circuit that the first microcomputer 7(constitutes a station again).Arrange microcomputer 7 to go to control the output of radio-frequency oscillator 3, the signal effective frequency that is fed to resonant circuit 5 can be changed.
Portable data processing card 2 comprises that a resonant circuit 11(constitutes the card resonant circuit), its output is sent to rectifier 12, and the output of rectifier 12 is direct voltages, for remaining circuit provides power supply.This resonant circuit 11 also is coupled to the loaded circuit 14 that links to each other with data converter 15, and the output of data converter is fed to data memory 16.What play interconnect function between resonant circuit 11 and data converter 15 is reading circuit 17.Data converter 15 and data memory 16 preferably are contained among second microcomputer 18, and constitute the card datel circuit effectively.
1 the operating principle of standing is as described below.Radio-frequency oscillator 3 produces a radiofrequency signal, and this signal is exaggerated wave detector 4 and amplifies.Resonant circuit 5 be tuned to radio-frequency oscillator 3 frequency and high Q value is arranged, when output signal is on desired frequency, cause resonance, but when the variation of radiofrequency signal surpasses a predetermined value, just stop resonance basically.
The effect of wave detector 4 is to detect a signal that is superimposed upon on the radiofrequency signal, resonant circuit 5 be tuned on this radiofrequency signal, can make radiofrequency signal play the effect of a carrier wave like this, this carrier signal can be carried out amplitude modulation by the suitable data that data processing card 2 produces.Band pass filter 6 removes the radio-frequency component in the signal after the detection, so that handled and stored by 7 pairs of original data-signals of microcomputer.Microcomputer 7 provides the device of regulating radio-frequency oscillator 3 output frequencies, so that make the frequency shift (FS) of generation be enough to prevent resonant circuit 5 resonance.
The operating principle of portable data processing card 2 is as described below.Resonant circuit 11 be tuned to the same resonance frequency of frequency that produces with fixed station 1.Therefore, when card 2 is placed near the station 1 the time, card resonant circuit 11 beginning resonance also are fed to rectifier 12 with the induced voltage that produces.The output of rectifier 12 is direct voltages, and this voltage is for providing power supply with card 2 telecommunication circuits that interrelate.
Once the power supply card 2 of feeding, loaded circuit 14 just begins to start according to the data that are stored in the data memory 16.The effect of loaded circuit 14 resembles a switch, and under normal circumstances, it produces a logical one.So-called normal condition is meant that loaded circuit 14 keeps open circuit, and meanwhile resonant circuit 11 does not load.When loaded circuit 14 starts, resonant circuit 11 is loaded, thereby lowered the output of resonant circuit and made it transmit logical zero.Therefore, this loaded circuit must be according to existing data in the data memory 16 repeatedly to start and stopping.This is to utilize the logical circuit in the data converter 15 to realize, data converter 15 has constituted the modulating device that utilizes the data signal modulation resonant frequency signal that is produced by card with loaded circuit 14.
Referring now to Fig. 2, it is more detailed expresses Fig. 1 some part of the station circuit of principle ground expression.The radio-frequency oscillator of above having mentioned 3 comprises a crystal oscillator 20, and this crystal oscillator 20 produces the radiofrequency signal of the radio frequency rate of a characteristic frequency.The output of crystal oscillator 20 is by frequency divider 21 frequency divisions and the radiofrequency signal of the lower frequency that obtains is fed to the base stage of bipolar junction transistor 22.The suitable impedance that utilization is made up of resistance 23 and electric capacity 24 parallel connections is provided between frequency divider 21 and the transistor 22 and plays coupling.The selection of this impedance value is that the analog voltage level of the logical voltage level of frequency divider 21 and transistor 22 is complementary.The emitter of transistor 22 is connected to ground 26 via resistance 27 and electric capacity 28 combinational networks in parallel.What link transistor 22 collector electrodes is the negative electrode of diode 29, and the anode of diode is linked the combinational network that coil 30 and tuning capacity 31 are in parallel, and the other end of this combinational network is linked positive voltage terminal 32.The inductance of coil 30 and electric capacity 31 and variable capacitance amount should be selected respectively like this, promptly total tuning circuit should resonance on the signal frequency that radio-frequency oscillator 3 is produced.Therefore, be not difficult to find out that coil 30 and electric capacity 31 are equivalent to station resonant circuit as shown in Figure 1.
The voltage signal at electric capacity 28 two ends is fed to the band pass filter 6 of known configurations, this filter in Fig. 2 with a three-terminal network (input, output and ground) reduced representation.The output of band pass filter 6 is fed to microcomputer 7.Microcomputer 7 is used to change the frequency dividing ratio of frequency divider 21, so that under the control of microcomputer, the signal frequency that radio-frequency oscillator 3 produces can change effectively, to prevent resonant circuit 5 resonance.
Referring now to Fig. 3, some circuit relevant that Fig. 3 has represented to have illustrated reasoningly in Fig. 1 Central Plains with data processing card 2.The card resonant circuit 11 comprise center tapped winding 35, its centre cap link ground 26, its two terminals link the end 36 with 37 and with electric capacity 38 cross-over connection mutually.The output of end 36 and 37 is fed to the anode of rectifier diode 40 and 41 respectively.The negative electrode of rectifier diode is linked common port 42, and this common port has constituted the bus for a positive voltage of card circuit supply.To be connected in positive voltage bus 42 and ground between 26 be smoothing capacity 43, and this electric capacity has reduced the ripple component that commutated direct current is pressed signal.Rectifier diode 40 and 41 has constituted the rectifier of representing as principle among Fig. 1 12 with smoothing capacity 43.
End 36 and 37 is also linked the anode of rectifier diode 45 and 46 respectively, also links the anode of rectifier diode 47 and 48 simultaneously respectively.Diode 45 and 46 negative electrode are linked the input of data converter 15 jointly.Diode 45 and 46 has constituted the loaded circuit 14 that principle is represented in Fig. 1.Diode 47 and 48 negative electrode are linked the timing circuit that is composed in parallel by electric capacity 49 and resistance 50 jointly, and above-mentioned capacitance-resistance low-pressure end is linked ground 26.Diode 47 and 48 and electric capacity 49 and resistance 50 constituted the reading circuit 17 that principle is represented in Fig. 1, this reading circuit 17 can utilize discrete circuit to constitute, but preferably the timing circuit of being made up of electric capacity 49 and resistance 50 is included in second microcomputer 18, constitutes the card datel circuit.
Explained that data processing card 2 does not have the power supply of oneself, but power by the voltage signal of station 1 radiation.This supply power mode is realized by following operation.Be placed to when data processing card in certain predetermined distance of distance station resonant circuit 5, and the station is when producing with the essentially identical frequency of the tuning frequency of card resonant circuit 11, resonance take place in card resonant circuit 11.Amplitude by the voltage signal that blocks resonant circuit 11 generations is the function of distance between station 1 and the card 2.In other words, card 2 distance stations 1 are nearer, and the amplitude of the voltage signal of card resonant circuit 11 inductions is just bigger.Generally speaking, when card 2 is 10 centimetres with the distance of station between 1, according to station 1 and block coupling amount between 2, the amplitude of voltage signal is designed to 10V.Be added to for fear of too high direct voltage on the datel circuit of card, utilize a Zener diode (not shown) the level of this voltage limit a safety.
Fig. 4 represents direct current output that rectifier 12 the produces waveform after smoothed.
Fig. 5 is with graphics mode represent the to stand voltage-reactance characteristic curve of resonant circuit 5.This characteristic curve is parabolic shape basically, and being equivalent to the resonance frequency place has a peak electricity pressure point.Change along any direction from resonance frequency, the reactance of resonant circuit 5 will correspondingly change, and its resonance potential will descend.As can be seen, on any one edge of voltage-reactance characteristic peak of curve, the part that all has a substantial linear for one of the resonant circuit reactance little variation, exists the variation of a corresponding big voltage that is produced by this resonant circuit in this part.Corresponding to operating frequency fo ' is this characteristic part, when require to stand 1 read to send by card 2 data the time, preferably use this frequency.Stand resonant circuit 5-to card resonant circuit 11 transmission powers and by rectifier 12 rectifications, and these data are just automatically transmitted.The direct voltage that is produced just is enabled in the logical circuit in the data converter 15, and makes this circuit send the data that are stored in advance in the data memory 16.
Fig. 6 a, 6b and 6C represent communication protocol, transmit data according to this communication protocol card 2.The pulse that each data transmits all is the calibration pulse width for logical zero and " 1 ", begins and ends with high voltage with low-voltage.The pulse shape of Fig. 6 a presentation logic " 0 ".In this case, this pulse voltage keeps its low-voltage to reach the high-tension twice of its maintenance.Fig. 6 b represents the state corresponding to logical one, and in this state, pulse voltage keeps its high voltage to reach the twice that it keeps low-voltage.The form of Fig. 6 c indicating impulse string, this pulse train is in order to transmit the 001(binary system) and produce.When not having data to transmit, voltage is to be in high level, and one transmits first pulse (corresponding to logical zero), and voltage just drops to low level.If the pulse period is represented by T, then voltage keeps low level at 2/3T, transfers high level in remaining pulse period then.During another one 2/3T, drop to low level then, rise to high level, be equivalent to transmit second logical zero in all the other times of second pulse duration.Then drop to the low level 1/3T time, remaining pulse duration keeps high level, is equivalent to transmit logical one again.
Referring now to Fig. 7, Fig. 7 represent to stand voltage-frequency characteristic curve of resonant circuit 5.It is parabola shaped that the shape of this curve is basically, and the crest voltage corresponding to the circuit resonant frequencies of representing with fo is in the drawings arranged.When the resonant circuit frequency change on each limit of fo, the voltage of this resonant circuit will descend.Fig. 7 is described to be cut-off frequency △ f, to such an extent as under fo ± △ f frequency, the undertension that the resonant circuit 5 of standing is produced is so that card resonant circuit 11 resonance.
When the microcomputer 7 that needs slave station 1 when data processing card 2 transmits data, a control signal from microcomputer 7 changes divider circuit 21(as shown in Figure 2 so like this) frequency dividing ratio, so that make station resonant circuit 5 produce resonance basically, describe with reference to Fig. 7 as top.This control signal can cause that also card resonant circuit 11 stops resonance.Therefore, during being transmitted control signal by microcomputer 7, no longer slave station 1 is to card 2 transmitted powers.
Smoothing capacity 43(in card 2 rectifier 12 sees Fig. 3) and the elaborate 9(that blocks timing circuit in 2 the reading circuit 17 is as shown in Figure 3) speed all determined with the time constant of these two circuit produces and discharges.The data of smoothing capacity 43 should be selected greater than electric capacity 49, to such an extent as to electric capacity 49 has been given out light electricity basically, the two ends of the smoothing capacity 43 of rectifier 12 still keep enough voltage, provide continuous power supply that the data transfer circuit in the data transaction card 2 is powered.
At this moment, if the microcomputer of standing in 1 is the frequency of radio-frequency oscillator to be set to its operating frequency fo ', the resonant circuit 5 of therefore standing will repeat resonance, by mutual coupling, block resonant circuit 11 and will also repeat resonance.With the not resonance of station resonant circuit 5 and speed designs enough fast of resonance again, be continual thereby make to card 2 transmission powers.When card resonant circuit 11 repeated resonance, the electric capacity 49 in the reading circuit 17 was by diode 47 and 48 recharges.Because the forward resistance of these diodes is very little, therefore, electric capacity 49 is just charging again at that time almost.
Fig. 8 a represents discharge and the recharge characteristic of electric capacity 49 for input signal Vin.This input signal Vin is corresponding to two control signals that sent to the divider circuit in radio-frequency oscillator 3 21 by station microcomputer 7.Fig. 8 b represents the corresponding signal Vout that the data converter 15 in the data card 2 produces.As can be seen, in the time of capacitor 49 each chargings, the state of Vout (being high or low level) changes from Fig. 8 b.Therefore, the time interval of discharge by changing electric capacity 49 and the charging that continues, the pulse duration that just can correspondingly regulate Vout.In addition, if slave station 1 is a pulse duration of having selected a kind of standard for use to the data transmission communication protocol that card 2 transmits data, then utilize to adjust the width of Vout continuous impulse, the shape of Vout can be translated as a series of pulse trains of the combination of be equivalent to stand 1 each logical zero that sends and " 1 ".
The explanation that Fig. 9 a and Fig. 9 b are more detailed this notion.Fig. 9 a represents to transmit data 56(hexadecimals for slave station 1 to card 2) waveform of the voltage Vin that produces on the electric capacity 49 at Fig. 3.Be equivalent to the 01010110(binary system) data be to be a series of pulse trains transmission of boundary with the initial sum stop bit that is fit to.When not having data to transmit, Vout is in a kind of initial high-voltage level, and it drops to a low voltage level corresponding to the transmission of start bit, at the end that these data transmit, the voltage level of Vout turns back to and remains on its initial high-voltage level, the end that designation data transmits.Comparison diagram 9a and Fig. 9 b, how each Vin pulse triggers the Vout voltage level between " 0 " and " 1 " as can be seen.For example in order to transmit " 1 " of two connections, only need that the control signal from microcomputer 7 is deferred to the time interval that is equivalent to two pulse durations and replace it.Time span between this Vin pulse correspondingly shown in Fig. 9 a, thereby the voltage level of Vout was remained unchanged in this time interval.Therefore be appreciated that data slave station 1 effectively are sent to card 2 by station resonant circuit 5 detunings are shaken.
Although with reference to a portable data transaction card preferred embodiment is described, should be appreciated that the present invention similarly can also use in more general data transmission system.
For example, in a kind of secret access system, a kind of access code can be pre-existing in the memory of card, in order to allow limited-access at the carrier that depends on the card that wherein has special code.
The present invention can also be for the manufacture of industry, each workpiece is mounted with the distinguishing mark that is equivalent to data card of the present invention, this distinguishing mark is not only identified this workpiece, but also record each process, for example process can be write distinguishing mark, in order to make the distinguishing mark device include a record from start to finish of the whole process operations of this workpiece.
The present invention can also be used as automatic special-purpose time card, perhaps as telephone subscriber's automatic accounting system, account number can be read by public telephone company from the data card that the user carries in this system, and the user needs portable phone cost coin, prepaid telephone card etc. thereby remove from traditionally.
Claims (33)
1, a kind of be used to stand and the portable data card between the data communication system that transmits of non-contact data, wherein the station comprises:
One be tuned to the station resonant circuit of first signal and one be used to detect the demodulator that is superimposed upon the secondary signal on first signal,
Wherein portable data processing card comprises:
One is used to make the two the induction coupling to take place so that slave station receives the card resonant circuit of power in response to the station resonant circuit,
A card datel circuit that is designed to by the power power supply of above-mentioned reception, this circuit is used for loading the card resonant circuit, this and utilize in response to the secondary signal of first data that are stored in the card datel circuit and remove to modulate first signal, utilize said induction coupling, first data are arrived at a station from the card transmission;
It is characterized in that wherein also comprising:
Station datel circuit in the station makes the station female apricot ︸ of the silly scar ⑼ ü shelves of resonance electricity coffee バ scold the silly scar of the silly respectful plaited straw coffee バ of bright hoop ㄐ in response to second data that are stored in the datel circuit of station
Reading circuit in data card comprises:
A pulse generating circuit that is coupled to the card resonant circuit is used to produce a pulse, wipes the predetermined variation that the power supply that circuit was received of shaking is taken place with response by card on state,
Several transformation parallel operations that are coupled to pulse generating circuit, in response to above-mentioned pulse, thereby the output of data converter is corresponding to said second data.
2, according to a kind of system of claim 1, it is characterized in that:
The datel circuit of standing comprises first generating means that is used to produce second data.
3, according to a kind of system of claim 1 or 2, it is characterized in that:
The datel circuit of standing is a microcomputer that is suitable for programming.
4, according to a kind of system of any one claim of each claim of front, it is characterized in that:
The datel circuit of standing comprises the detuning circuit that shakes, and it shakes station resonant circuit detuning in response to second data.
5, according to a kind of system of any one claim in each claim of front, it is characterized in that:
Stand resonant circuit in response to a first frequency signal, and an oscillator that produces the second frequency signal is provided, this second frequency signal is transformed to this first frequency signal by divider device.
6, according to a kind of system of claim 5, it is characterized in that:
This divider device is controlled by the station datel circuit.
7,, it is characterized in that the station also comprises according to a kind of system of claim 6:
One is used for the detuning that station resonant circuit detuning the shakes circuit that shakes in response to second data, and this circuit also comprises:
Be used to change the device of divider device frequency dividing ratio, so that prevent the resonance of standing.
8, according to a kind of system of any one claim in each claim of front, it is characterized in that:
Portable data card also comprises the rectifier unit that links to each other with smmothing capacitor, is used for the power that rectifier receives.
9, according to a kind of system of any one claim in each claim of front, it is characterized in that:
The card datel circuit comprises second generating means that is used to produce secondary signal.
10, according to a kind of system of any one claim in each claim of front, it is characterized in that:
The card datel circuit also comprises and is used to respond the loaded circuit that secondary signal loads the card resonant circuit.
11, according to a kind of system of claim 10, it is characterized in that:
Modulating device is provided with for change first signal in response to secondary signal.
12, according to a kind of system of claim 11, it is characterized in that:
This modulating device is used to realize amplitude modulation(PAM).
13, according to a kind of system of claim 4 any one claim to the claim 12, it is characterized in that:
Portable data card also comprises, links to each other with smoothing capacity, is used for the rectifier unit to the power rectification that receives.
14, according to a kind of system of claim 13, it is characterized in that:
When detuning shook circuit working, capacitor was with very first time constant discharge, and shook circuit when not working when detuning, and capacitor charges with second time constant, to such an extent as to:
Very first time constant is significantly greater than second time constant, and the time interval deficiency between the discharge in succession of capacitor and the charging so that smmothing capacitor discharge fully.
15, according to a kind of system of any one claim in each claim of front, it is characterized in that:
The card datel circuit is a microcomputer that is fit to programming.
16, according to a kind of system of claim 15, it is characterized in that:
Reading circuit is included in the microcomputer at least in part.
17, a kind of being used for according to the station in a kind of system of any one claim of each claim of front, this station comprises:
A resonant circuit that is tuned in first signal,
One is used to detect the demodulator that is superimposed upon the secondary signal on first signal, it is characterized in that wherein also comprising:
Response is stored in the data in the datel circuit, the datel circuit that the resonant circuit detuning is shaken.
18, according to a kind of station of claim 17, it is characterized in that:
Datel circuit comprises the generating means that is used to produce above-mentioned data.
19, according to a kind of station of claim 17 or 18, it is characterized in that:
Datel circuit is the microcomputer that is fit to programming.
20, according to a kind of station of any one claim in the claim 17 to 19, it is characterized in that:
Datel circuit comprises one in response to above-mentioned data, the detuning that is used to its resonant circuit detuning the is shaken circuit that shakes.
21, according to a kind of station of any one claim in the claim 17 to 20, it is characterized in that:
Resonant circuit is in response to the first frequency signal, and wherein sets up an oscillator, and this oscillator produces second frequency signal, and this second frequency signal is transformed to the first frequency signal by divider device.
22, according to a kind of station of claim 21, it is characterized in that:
Divider device is controlled by datel circuit.
23, according to a kind of station of claim 22, it is characterized in that wherein also comprising:
Shake circuit and be used to change the device of frequency divider frequency dividing ratio of the detuning that is used to its resonant circuit detuning is shaken in response to above-mentioned data is so that prevent resonance.
24, a kind of being used for according to the card in a kind of system of any one claim of claim 1 to 16, this card comprises:
Resonant circuit that is tuned in first signal and
A datel circuit that is designed to the power power supply that received by resonant circuit is stored in data in the datel circuit with response, and resonant circuit is loaded, and it is characterized in that wherein also comprising:
A reading circuit comprises:
A pulse generating circuit that is coupled to resonant circuit is used to produce a pulse, with in response to power supply that resonant circuit was received on state predetermined variation and
One is coupled to this pulse generating circuit and in response to the data converter of above-mentioned pulse, so the output of this data converter is corresponding to the data-signal that is sent on the card.
25, according to a kind of card of claim 24, it is characterized in that wherein also comprising:
Be coupled to the rectifier unit that smmothing capacitor is used for the power of rectifier reception.
26, according to a kind of card of claim 24 or 25, it is characterized in that:
This datel circuit comprises generation device, is used for producing secondary signal according to the data that are stored in wherein.
27, according to a kind of card of claim 26, it is characterized in that:
This datel circuit also comprises loaded circuit, with the response secondary signal resonant circuit is loaded.
28, according to a kind of card of claim 26 or 27, it is characterized in that:
According to the secondary signal modulating device that is provided with of first signal for a change.
29, according to a kind of card of claim 28, it is characterized in that:
This modulating device is used to realize amplitude modulation(PAM).
30, according to a kind of card of any one claim in the claim 25 to 29, it is characterized in that:
The pulse generating unit that comprises a capacitor, the discharge when power that is used for receiving when resonant circuit descends, and charging when the power that receives rises.
31, according to a kind of card of claim 30, it is characterized in that:
When the power that receives descended, this capacitor was suitable for very first time constant discharge, when the power that receives rises, and with the charging of second time constant, to such an extent as to:
Very first time constant is significantly greater than second time constant, and capacitor in succession discharge and recharge between the time interval be not enough to cause the smoothing capacity discharge basically.
32, according to a kind of card of any one claim in the claim 24 to 31, it is characterized in that:
This datel circuit is a microcomputer that is suitable for programming.
33, according to a kind of card of claim 32, it is characterized in that:
This reading circuit has at least a part to be included in this microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102775 CN1036115A (en) | 1988-03-26 | 1988-03-26 | Electronic data communications system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102775 CN1036115A (en) | 1988-03-26 | 1988-03-26 | Electronic data communications system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1036115A true CN1036115A (en) | 1989-10-04 |
Family
ID=4832302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88102775 Pending CN1036115A (en) | 1988-03-26 | 1988-03-26 | Electronic data communications system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1036115A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334595C (en) * | 2003-01-10 | 2007-08-29 | Atmel德国有限公司 | Circuit device with power supplied by electromagnetic filed |
| CN100449568C (en) * | 2004-04-15 | 2009-01-07 | 松下电器产业株式会社 | Semiconductor integrated circuit and contactless type information system including the same |
| CN102365848A (en) * | 2009-04-14 | 2012-02-29 | 伊特伦法国公司 | Wireless two-way transmission of serial data signals between an electronic device and a power meter |
-
1988
- 1988-03-26 CN CN 88102775 patent/CN1036115A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334595C (en) * | 2003-01-10 | 2007-08-29 | Atmel德国有限公司 | Circuit device with power supplied by electromagnetic filed |
| CN100449568C (en) * | 2004-04-15 | 2009-01-07 | 松下电器产业株式会社 | Semiconductor integrated circuit and contactless type information system including the same |
| CN102365848A (en) * | 2009-04-14 | 2012-02-29 | 伊特伦法国公司 | Wireless two-way transmission of serial data signals between an electronic device and a power meter |
| CN102365848B (en) * | 2009-04-14 | 2014-03-26 | 伊特伦法国公司 | Wireless two-way transmission of serial data signals between an electronic device and a power meter |
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