CA1183927A - Device for the identification of information, particularly an electronic lock-key combination - Google Patents
Device for the identification of information, particularly an electronic lock-key combinationInfo
- Publication number
- CA1183927A CA1183927A CA000417825A CA417825A CA1183927A CA 1183927 A CA1183927 A CA 1183927A CA 000417825 A CA000417825 A CA 000417825A CA 417825 A CA417825 A CA 417825A CA 1183927 A CA1183927 A CA 1183927A
- Authority
- CA
- Canada
- Prior art keywords
- coil
- key
- information
- carrier
- fact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
- G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
- G07C2009/00777—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by induction
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Lock And Its Accessories (AREA)
Abstract
Abstract A device for the identification of information, particularly an access control system consisting of electronic lock and key portions in which, when the key portion approaches the lock portion the oscillator circuit of the lock portion oscillates at high frequency, this oscillation being picked up by the key portion and, modulated by a frequency or pulse pattern that serves as a key identifier, retransmitted to the lock portion to be further processed by the lock-side receiver and recognition device. The transmission and re-transmission of the energy between the lock and key portions is effected by a wave coupling by means of antenna coils, this producing an inductively coupled synchronisation switch, this causing a changed signal curve caused, for example, by a more or less complete short circuit at the key-side coil or by an energy impression on this.
Description
~33~
This invention relates -to a device for the identification of information, particularly an electronic lock-key combination.
A device used for the identification of information is already familiar from DOS 2657182: this is associated with a first carrier component (key component) with the help of readers, that are arranged in a second carrier co-mponent (lock component) in which regard the information is contained in coded form in a first information carrier in the first carrier component, the first carrier component in addition having a receiver and a signal generator that is controlled by the first information carrier. ~he second carrier com-lD ponent also has a receiver as well as a gating circuit that contains a second info~mztion carrier and which is connected to a power source that can be coupled with the receiver component of the first carrier component in order to transfer the energy used to activate the components of the first carrier component and to control the first information carrier in such a manner that the signal generator issues an information signal that is impressed by the information of the first information carrier~ this being received by the receiver in the second carrier component and, if necessary, after conversion in the gating circuit is compared with the reference information of the second information carrier, and in which regard the gating circuit issues a characteristic output signal in which the first and second items of inEormation are in the desired relationship to each other.
Important characteristics oE this device are seen, amongst others, in the Eact that an energy gating stage :is assoc:iate~d with the receive-r in the Ei.rst cLrrier componellt alld this only tr:iggers the Eirst :inEormation charactor il tllo energy roceivecl excee-ls a spociEic minimum value, in the Eirs-t and second c;lrrior com~ollollts there are s~lpplementary coml)onen-ts of an elcctronic ~igtla;l gollorutor, t~e oloctron:ic compollollts of tho Eirst carr:ior comporleTIt are the frequency and/or amplitude determining swi-tching components of -the signal generatc,r, the first carrier component contains an oscillator at -the input of which there is an impedance (coil) and by the fact that the second carrier component has a second impedance ~coil) that can be coupled with the first impedance and the impedances(coils) contain ferrite and are configured as ferrite antennae In this familiar identifica-tion system that can be produced in a lock-key combination the following problems between the lock and the key remain unsolved, namelyl a si~Lal impression on the key side must be recognized on the lock side, the signal impression on the key side must be effected at precisely determined times in order that the lock side can be concentrated ex-clusively at these times and the lock side is synchronized during signal recognition on the signal occurrence times, and a coded signal impression must result on the key side The present invention which aims at solving these problems consis-ts fundamentally in the fact thatan inductively coupled synchronization switch is produced and is used, in which regard means are provided that bring abou-t a more or less complete shor-t circuit of the coil or an energy impression on the signal of the coil, respectively, so that at times that are determined by a coincidence of counter events a changed signal curve results both on the side of the key coil and on the lock side coil An important implementation characteristic is seen in the fact that the short circuit on the key side coil is produced through a diode; this ensures the advantage tllat according to the switching of the diode there is on each occasion a half wave, o g , that is positive, not short circuited, which is av.lilable for counting the pulses, which ellsures that the key side switch is closed exactly at ~I time that is proscribed by the signcll generation on the side O~ tilO Lock si(lo coil, A Eurther important olement of tlle lock-key com-3~
bination of this invention is seen in the fact that on the key side there is an electronic circuit incorporated and this interrogates and counts the half waves that are passed through from the above described diode, in which regard this electronic circuit contains a coding that determines the times in which the switch ~hat short circuits the key side coil is effective.
According to a broad aspect of the invention there is provided a device used for identifying information, par-ticularly access control, that is associated with a first carrier component (key portion), with the help of readers, that are associated with a second carrier portion (lock portion), the information being contained in coded form in a first information carrier in the first carrier component, the first carrier component having a receiver portion and a signal generator that is acted on by the first information carrier, the second carrier portion also having a receiver portion as well as an interpreter that contains a second information carrier, this being connected tG a power supply that can be connected to the receiver portion of the first carrier com-ponent for the transmission of energy in order to activate the components of the first carrier component and control the first information carrier in such a manner that the signal generator sends an information signal that is formed by the information of the :Eirst information carrier, this being received by the receiver portion and, if necessary, after conversion in the gating circuit is compared with the reference i.nformation in the second information carri.er, and whereupon the gating circuit transmits a characteristic output signal pro-viding the first and second items of in.formation are in a desired relations]li.p to each other, the :E;.rst carr;.er component contains an osc:illator, at the output oE wh:ich there is a coil, ancl the second carr:ier component has a secon-l coil that can ho couple~l to the :Ei:rst coil, ch.lracterized by the fact that an i.nclllct:ivo:ly coul~:Lod syncllron;.sat:ion swi-tch is procluced and is used, i.n which 3~
regard means are provided that effect a substantially total short circuit oE
the second coil or an energy impression on the signal of the second coil so that the times that are determined by a coincidence of the counter events result in a changed signal curve on the side of the second (key) coil and on the side of the first (lock) coil.
These and other features of the invention are described in greater detail on the basis of the drawings appended, in which:
Figures 1 and 2 show an induc~ively coupled synchronization switch, Figures 3 and 4 show lock-key circuits that contain the synchroni-zation switch built in and whi.ch are completed by the already described elec-tronic elements, Figures 5 and 6 are signal curves, and Figure 7 shows a circuit for energy impression.
According to the circuit in Figure 1 a periodic signal is passed from a generator G through a resistance Rl and a coil Ll. The components that are combined in this circuit belong in this application to an electronic lock-key combination, to the lock side. One of the coils L2 is associated with the key side is coupled with the lock side coil Ll so that on both coils the appropriate signal curve results with a phase shift. If the coil L2 is now short circuited through the switch S2 there is a changed signal curve not only on the side of the coil L2 and this short circuit can also be established on the coil Ll at Sl. The associated signal curves can be seen in the drawings that form part of Figure 1. An inductively coupled switch is disclosed with the principle described herein.
~nother type of this switch result iE change of the coupling condi-tion between coi.l Ll and L2 occursJ in that the coils are moved apart or a suitab.Le matcrial M :i.s inserted between thc coils, respectively. In this way . ~ _ 3~ 7 the function of the switch S2 can be activated or deactiva-ted, respectively.
Thus the switch would be dependent on the coupling relationship. This would then mean that this is an inductive coupling switch.
As can be seen from the signal curve in Figure 1 the signal disappears for the time during which the switch S2 is short circuited. If it is somehow possible to short circuit the signal at S2 in such a manner that at -the same time counting of the signals at S2 is not interrupted it will be possible to pro-duce a synchroni~ation between the signals. It is thus possible precisely after the n-th return of the signal Sl to the sides of the coil Ll to close the :L0 switch 2 across the coil L2.
If, as is shown in Figure 2, the short circuit at the coil L2 is passed through a diode Dl this can be achieved. In this case, for example, the positive half waves of the signal are not short circuited, so that they are available for counting. The counting of the positive signal waves is carried out on the side of coil L2, the switch S2 can close at the precise time that is provided for by the signal generation on the side of the coil Ll.
Therefore, if the frequency on the side of the signal generator is changed the frequency on the side of the switch will also change although the counting of the positive half waves will remain unchanged so that switching willalways occur exactly at the same wave passage although at different time dif-i-erences between the switching events. The principle oE use for the solution o the problems set out above can be seen in the circuit in Figure 3 which makesplain the addition of the electronic circuit E2 to the circuits. 'ihe electroniccircuit is used to interrogatc and to count the, For example, positive half wavos oE the key ci.rcuit. I'he e:lec-troll:ic circuit ~2 contains a coding wh:ich ~letormillcs whon ~hc switch S2 :is short circu:i-ted. O~ the -two s:ignal curves it .iS IlOt IIOW tilC ono of the lock circuit that is thc deterMining one, but that of 3~32~7 the key circuit. At a speciflc time (after n positive half waves of -the signal) there is a short circuit that can be referred to Sl after a delay of t.
IJsing this principle the signals that arrive on the key side can be referred ully synchronized to Sl and are thus recognizable.
In addition, there is also the component El that converts the AC
signal to a DC signal. Using this component the power supply is generated on the side of the key. Here, too, it is advantageous that only the one half wave is cut off for a brief period so that there is no lasting interruption notice-able in the power supply.
The circuit shown in Figure 3 can also be improved wi-th the objec-tive of making the signal even more effective as an information carrier.
According to the circuit in Figure 3 the signal that is produced by the short circuit is imposed cn that of the signal generator and the task now exists of making this signal more prominent on the fundamental signal of the signal generator.
In essence, there are two conceivable methods of doing this. Suit-able signal manipulations can be undertaken on part 2 as well as on part l.
Ilowever, every additional expenditure that must be associated with the part that is moved (here the key part 2) is problematic. Al] the additional manipulations of this part to achieve improved signal transmission increase the number of components and thus the power consumption and the space requirement. Addition-al expenditures should thus be undertaken only in regard to those parts that are permittecl on the basis oE spatill structure. Basically, however, the Following versions can be rclated both to part l as well as part 2.
I`he solut:ion to th:is problem that is proposed here proceeds Erom the ~act that in ['art I therc is L second coil L3 th1t :is spatially separated from the coil L.l in sucl1 n m111ner th1t the electromagnetic influence of the coil L2 3~7 does not effect the coil L3. If the coi]. L3 is now connected by suitable cir-cuitry with coil 1 in such a mamler that the basic signals that are applied to them are completely equal, all deviations from this equality can be clearly detected by means of a differential amplifier.
The solution is outlined in Figure 4. In Figure 5 the signals at the points A, B, and C are represented as they are if Part 2 is not in the vicinity of Part 1. The inductances Ll, L3 are so matched through the resistors Rl and R3 that they display a phase shift in their signals at the points A and B. As a result of the difference between the signals A and B which are applied to the input of the operational amplifier OPl the signal curve C results as the output signal of the operational amplifier.
If part 2 now approaches part 1 the total inductance through the inductances Ll and L2 that are now in the vicinity will change the signal curve A so that when the resistances of Rl and R3 are correctly matched the signals A and B will be precisely superimposed or, in the event that the coils Ll and L3 are wound in opposite directions, will be phase shifted by lX0 degrees, respectively. At the output of the operational amplifier, as a result of the difference between the signals A and B that has disappeared there will be no moresignal at i.ts input. The C-line will be identical with the O-line (will have constant values, respectively). This changes for the moment at which the switch Sl is closed. The coil L2 wllich when the switch is open receives its power from coil 1 thus builds up a voltage at the resistance R2 is short cir-cuited and the field collapses and this immediately a:Ffects the coil 1 resultillg in. a s;.gnal curve as is shown at the point ts :in ~igure 6. The coil L3 in Part L remElins unaEfected by this change 1S a result o~ the circuit chmge in l'art 2, s:incc :it is located sp.lt:ially at a suEEicient d:istance from coi:L 1.
'['lli.s procoss :is s~l:i.tal)ly representecl :in rigure 6. The two curves A
and B from Figure 5 have been combined into one curve in Figure 6. It is only at the points -ts ~the time at which the switch Sl is closed) that there is a brie:E difference between the two signals. This changes the input signal of the operational amplifier which emits the signal suitably amplified in the form of the curve C from its output. This signal is such a plain derivation of the circuit change of Sl that it can be subjected to further electronic processing without any great difficulty.
The matching of the circuits in the Pa-rts 1 and 2, or their matching to each other, respectively, can occur automatically in that the resistances Rl and R3 are configured as voltage regulating resistances. The output signal of the operational amplifier is in this case used in order to change a resis-tance until the output signal has achieved a minimum value.
Instead of the short circuiting of the key side coil L2 by the switch Sl a synchronic switch can also be effected by means of an additional loading of L2 by an uncharged condenser that is applied to the coil by means of a switch, in which regard, however, it must be borne in mind that the capacitive short circuit cannot be compared to the greater conceivable loading by a switch rlo5ure and that the familiar temporally exponential reduction of the effect of the capacitive short circuit cannot be utilized in connection with the pro-duction of a synchronic switch.
On the other hand, a supply of energy that is stored in a charged capacitor presents another possibility for a means Oe synchronization that can be eEfected through the efeect on the coil. The capacitor is connected to the co:il by means of a switch in which regard the sw:itching time can be determined by eam:iliar measures eor synchrollizat:ion, for example, by counting the half ~; .
[~iguro 7 shows one exemplary vers:ion eor the principle of the syn-chronization switch based on the energy supply. According to this there is an additional capa.city in the key power circuit and this is applied to the inductance L2 through the short circuit switch S2. Operation of the short circuit switch S2 is controlled by the electronic circuit E3 so that at a suitable time the charge quantity that is to be found on Cl flows through the inductance L2 and an effect is caused on the lock coil Ll by the flow of cur-rent that results. It is interesting to note that this type of short circuit does not destroy energy but the energy that is available in Cl is supplied for a short time. This energy supply that takes place at tl can be recognized in 1~ the resulting peak in the curve in Figure 7a.
This invention relates -to a device for the identification of information, particularly an electronic lock-key combination.
A device used for the identification of information is already familiar from DOS 2657182: this is associated with a first carrier component (key component) with the help of readers, that are arranged in a second carrier co-mponent (lock component) in which regard the information is contained in coded form in a first information carrier in the first carrier component, the first carrier component in addition having a receiver and a signal generator that is controlled by the first information carrier. ~he second carrier com-lD ponent also has a receiver as well as a gating circuit that contains a second info~mztion carrier and which is connected to a power source that can be coupled with the receiver component of the first carrier component in order to transfer the energy used to activate the components of the first carrier component and to control the first information carrier in such a manner that the signal generator issues an information signal that is impressed by the information of the first information carrier~ this being received by the receiver in the second carrier component and, if necessary, after conversion in the gating circuit is compared with the reference information of the second information carrier, and in which regard the gating circuit issues a characteristic output signal in which the first and second items of inEormation are in the desired relationship to each other.
Important characteristics oE this device are seen, amongst others, in the Eact that an energy gating stage :is assoc:iate~d with the receive-r in the Ei.rst cLrrier componellt alld this only tr:iggers the Eirst :inEormation charactor il tllo energy roceivecl excee-ls a spociEic minimum value, in the Eirs-t and second c;lrrior com~ollollts there are s~lpplementary coml)onen-ts of an elcctronic ~igtla;l gollorutor, t~e oloctron:ic compollollts of tho Eirst carr:ior comporleTIt are the frequency and/or amplitude determining swi-tching components of -the signal generatc,r, the first carrier component contains an oscillator at -the input of which there is an impedance (coil) and by the fact that the second carrier component has a second impedance ~coil) that can be coupled with the first impedance and the impedances(coils) contain ferrite and are configured as ferrite antennae In this familiar identifica-tion system that can be produced in a lock-key combination the following problems between the lock and the key remain unsolved, namelyl a si~Lal impression on the key side must be recognized on the lock side, the signal impression on the key side must be effected at precisely determined times in order that the lock side can be concentrated ex-clusively at these times and the lock side is synchronized during signal recognition on the signal occurrence times, and a coded signal impression must result on the key side The present invention which aims at solving these problems consis-ts fundamentally in the fact thatan inductively coupled synchronization switch is produced and is used, in which regard means are provided that bring abou-t a more or less complete shor-t circuit of the coil or an energy impression on the signal of the coil, respectively, so that at times that are determined by a coincidence of counter events a changed signal curve results both on the side of the key coil and on the lock side coil An important implementation characteristic is seen in the fact that the short circuit on the key side coil is produced through a diode; this ensures the advantage tllat according to the switching of the diode there is on each occasion a half wave, o g , that is positive, not short circuited, which is av.lilable for counting the pulses, which ellsures that the key side switch is closed exactly at ~I time that is proscribed by the signcll generation on the side O~ tilO Lock si(lo coil, A Eurther important olement of tlle lock-key com-3~
bination of this invention is seen in the fact that on the key side there is an electronic circuit incorporated and this interrogates and counts the half waves that are passed through from the above described diode, in which regard this electronic circuit contains a coding that determines the times in which the switch ~hat short circuits the key side coil is effective.
According to a broad aspect of the invention there is provided a device used for identifying information, par-ticularly access control, that is associated with a first carrier component (key portion), with the help of readers, that are associated with a second carrier portion (lock portion), the information being contained in coded form in a first information carrier in the first carrier component, the first carrier component having a receiver portion and a signal generator that is acted on by the first information carrier, the second carrier portion also having a receiver portion as well as an interpreter that contains a second information carrier, this being connected tG a power supply that can be connected to the receiver portion of the first carrier com-ponent for the transmission of energy in order to activate the components of the first carrier component and control the first information carrier in such a manner that the signal generator sends an information signal that is formed by the information of the :Eirst information carrier, this being received by the receiver portion and, if necessary, after conversion in the gating circuit is compared with the reference i.nformation in the second information carri.er, and whereupon the gating circuit transmits a characteristic output signal pro-viding the first and second items of in.formation are in a desired relations]li.p to each other, the :E;.rst carr;.er component contains an osc:illator, at the output oE wh:ich there is a coil, ancl the second carr:ier component has a secon-l coil that can ho couple~l to the :Ei:rst coil, ch.lracterized by the fact that an i.nclllct:ivo:ly coul~:Lod syncllron;.sat:ion swi-tch is procluced and is used, i.n which 3~
regard means are provided that effect a substantially total short circuit oE
the second coil or an energy impression on the signal of the second coil so that the times that are determined by a coincidence of the counter events result in a changed signal curve on the side of the second (key) coil and on the side of the first (lock) coil.
These and other features of the invention are described in greater detail on the basis of the drawings appended, in which:
Figures 1 and 2 show an induc~ively coupled synchronization switch, Figures 3 and 4 show lock-key circuits that contain the synchroni-zation switch built in and whi.ch are completed by the already described elec-tronic elements, Figures 5 and 6 are signal curves, and Figure 7 shows a circuit for energy impression.
According to the circuit in Figure 1 a periodic signal is passed from a generator G through a resistance Rl and a coil Ll. The components that are combined in this circuit belong in this application to an electronic lock-key combination, to the lock side. One of the coils L2 is associated with the key side is coupled with the lock side coil Ll so that on both coils the appropriate signal curve results with a phase shift. If the coil L2 is now short circuited through the switch S2 there is a changed signal curve not only on the side of the coil L2 and this short circuit can also be established on the coil Ll at Sl. The associated signal curves can be seen in the drawings that form part of Figure 1. An inductively coupled switch is disclosed with the principle described herein.
~nother type of this switch result iE change of the coupling condi-tion between coi.l Ll and L2 occursJ in that the coils are moved apart or a suitab.Le matcrial M :i.s inserted between thc coils, respectively. In this way . ~ _ 3~ 7 the function of the switch S2 can be activated or deactiva-ted, respectively.
Thus the switch would be dependent on the coupling relationship. This would then mean that this is an inductive coupling switch.
As can be seen from the signal curve in Figure 1 the signal disappears for the time during which the switch S2 is short circuited. If it is somehow possible to short circuit the signal at S2 in such a manner that at -the same time counting of the signals at S2 is not interrupted it will be possible to pro-duce a synchroni~ation between the signals. It is thus possible precisely after the n-th return of the signal Sl to the sides of the coil Ll to close the :L0 switch 2 across the coil L2.
If, as is shown in Figure 2, the short circuit at the coil L2 is passed through a diode Dl this can be achieved. In this case, for example, the positive half waves of the signal are not short circuited, so that they are available for counting. The counting of the positive signal waves is carried out on the side of coil L2, the switch S2 can close at the precise time that is provided for by the signal generation on the side of the coil Ll.
Therefore, if the frequency on the side of the signal generator is changed the frequency on the side of the switch will also change although the counting of the positive half waves will remain unchanged so that switching willalways occur exactly at the same wave passage although at different time dif-i-erences between the switching events. The principle oE use for the solution o the problems set out above can be seen in the circuit in Figure 3 which makesplain the addition of the electronic circuit E2 to the circuits. 'ihe electroniccircuit is used to interrogatc and to count the, For example, positive half wavos oE the key ci.rcuit. I'he e:lec-troll:ic circuit ~2 contains a coding wh:ich ~letormillcs whon ~hc switch S2 :is short circu:i-ted. O~ the -two s:ignal curves it .iS IlOt IIOW tilC ono of the lock circuit that is thc deterMining one, but that of 3~32~7 the key circuit. At a speciflc time (after n positive half waves of -the signal) there is a short circuit that can be referred to Sl after a delay of t.
IJsing this principle the signals that arrive on the key side can be referred ully synchronized to Sl and are thus recognizable.
In addition, there is also the component El that converts the AC
signal to a DC signal. Using this component the power supply is generated on the side of the key. Here, too, it is advantageous that only the one half wave is cut off for a brief period so that there is no lasting interruption notice-able in the power supply.
The circuit shown in Figure 3 can also be improved wi-th the objec-tive of making the signal even more effective as an information carrier.
According to the circuit in Figure 3 the signal that is produced by the short circuit is imposed cn that of the signal generator and the task now exists of making this signal more prominent on the fundamental signal of the signal generator.
In essence, there are two conceivable methods of doing this. Suit-able signal manipulations can be undertaken on part 2 as well as on part l.
Ilowever, every additional expenditure that must be associated with the part that is moved (here the key part 2) is problematic. Al] the additional manipulations of this part to achieve improved signal transmission increase the number of components and thus the power consumption and the space requirement. Addition-al expenditures should thus be undertaken only in regard to those parts that are permittecl on the basis oE spatill structure. Basically, however, the Following versions can be rclated both to part l as well as part 2.
I`he solut:ion to th:is problem that is proposed here proceeds Erom the ~act that in ['art I therc is L second coil L3 th1t :is spatially separated from the coil L.l in sucl1 n m111ner th1t the electromagnetic influence of the coil L2 3~7 does not effect the coil L3. If the coi]. L3 is now connected by suitable cir-cuitry with coil 1 in such a mamler that the basic signals that are applied to them are completely equal, all deviations from this equality can be clearly detected by means of a differential amplifier.
The solution is outlined in Figure 4. In Figure 5 the signals at the points A, B, and C are represented as they are if Part 2 is not in the vicinity of Part 1. The inductances Ll, L3 are so matched through the resistors Rl and R3 that they display a phase shift in their signals at the points A and B. As a result of the difference between the signals A and B which are applied to the input of the operational amplifier OPl the signal curve C results as the output signal of the operational amplifier.
If part 2 now approaches part 1 the total inductance through the inductances Ll and L2 that are now in the vicinity will change the signal curve A so that when the resistances of Rl and R3 are correctly matched the signals A and B will be precisely superimposed or, in the event that the coils Ll and L3 are wound in opposite directions, will be phase shifted by lX0 degrees, respectively. At the output of the operational amplifier, as a result of the difference between the signals A and B that has disappeared there will be no moresignal at i.ts input. The C-line will be identical with the O-line (will have constant values, respectively). This changes for the moment at which the switch Sl is closed. The coil L2 wllich when the switch is open receives its power from coil 1 thus builds up a voltage at the resistance R2 is short cir-cuited and the field collapses and this immediately a:Ffects the coil 1 resultillg in. a s;.gnal curve as is shown at the point ts :in ~igure 6. The coil L3 in Part L remElins unaEfected by this change 1S a result o~ the circuit chmge in l'art 2, s:incc :it is located sp.lt:ially at a suEEicient d:istance from coi:L 1.
'['lli.s procoss :is s~l:i.tal)ly representecl :in rigure 6. The two curves A
and B from Figure 5 have been combined into one curve in Figure 6. It is only at the points -ts ~the time at which the switch Sl is closed) that there is a brie:E difference between the two signals. This changes the input signal of the operational amplifier which emits the signal suitably amplified in the form of the curve C from its output. This signal is such a plain derivation of the circuit change of Sl that it can be subjected to further electronic processing without any great difficulty.
The matching of the circuits in the Pa-rts 1 and 2, or their matching to each other, respectively, can occur automatically in that the resistances Rl and R3 are configured as voltage regulating resistances. The output signal of the operational amplifier is in this case used in order to change a resis-tance until the output signal has achieved a minimum value.
Instead of the short circuiting of the key side coil L2 by the switch Sl a synchronic switch can also be effected by means of an additional loading of L2 by an uncharged condenser that is applied to the coil by means of a switch, in which regard, however, it must be borne in mind that the capacitive short circuit cannot be compared to the greater conceivable loading by a switch rlo5ure and that the familiar temporally exponential reduction of the effect of the capacitive short circuit cannot be utilized in connection with the pro-duction of a synchronic switch.
On the other hand, a supply of energy that is stored in a charged capacitor presents another possibility for a means Oe synchronization that can be eEfected through the efeect on the coil. The capacitor is connected to the co:il by means of a switch in which regard the sw:itching time can be determined by eam:iliar measures eor synchrollizat:ion, for example, by counting the half ~; .
[~iguro 7 shows one exemplary vers:ion eor the principle of the syn-chronization switch based on the energy supply. According to this there is an additional capa.city in the key power circuit and this is applied to the inductance L2 through the short circuit switch S2. Operation of the short circuit switch S2 is controlled by the electronic circuit E3 so that at a suitable time the charge quantity that is to be found on Cl flows through the inductance L2 and an effect is caused on the lock coil Ll by the flow of cur-rent that results. It is interesting to note that this type of short circuit does not destroy energy but the energy that is available in Cl is supplied for a short time. This energy supply that takes place at tl can be recognized in 1~ the resulting peak in the curve in Figure 7a.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device used for identifying information, particularly access con-trol, that is associated with a first carrier component (key portion), with the help of readers, that are associated with a second carrier portion (lock portion), the information being contained in coded form in a first information carrier in the first carrier component, the first carrier component having a receiver por-tion and a signal generator that is acted on by the first information carrier, the second carrier portion also having a receiver portion as well as an inter-preter that contains a second information carrier, this being connected to a power supply that can be connected to the receiver portion of the first carrier component for the transmission of energy in order to activate the components of the first carrier component and control the first information carrier in such a manner that the signal generator sends an information signal that is formed by the information of the first information carrier, this being received by the receiver portion and, if necessary, after conversion in the gating circuit is compared with the reference information in the second information carrier, and whereupon the gating circuit transmits a characteristic output signal pro-viding the first and second items of information are in a desired relationship to each other, the first carrier component contains an oscillator, at the output of which there is a coil, and the second carrier component has a second coil that can be coupled to the first coil, characterized by the fact that an inductively coupled synchronization switch is produced and is used, in which regard means are provided that effect a substantially total short circuit of the second coil or an energy impression on the signal of the second coil so that the times that are determined by a coincidence of the counter events result in a changed signal curve on the side of the second (key) coil and on the side of the first (lock) coil.
2. A device according to Claim 1, characterized by the fact that on the key-side coil a short-circuit occurs through a diode.
3. A device according to Claim 2, characterized by the fact that an electronic circuit is incorporated in the key side which interrogates half waves of signals that are passed by the diode, this electronic circuit contain-ing a coding that determines the time at which the switch that short-circuits the key-side coil will be effective.
4. A device according to Claim 1, characterized by the fact that in order to provide for short-circuiting the key-side coil an uncharged capacitor is connected after this through a short-circuit switch.
5. A device according to Claim 3, characterized by the fact that within the lock portion a further coil that is separated from the first coil is so arranged that the electromagnetic effect of the key side coil disappears on said further coil.
6. A device according to Claim 3, characterized by the fact that the inductances of the first and third coils are so matched through variable resis-tors that they display no phase shift in their signals at comparable measuring points, and by the fact that these identical phase signals are passed to an operational amplifier having differential inputs and an output on which appears an output signal.
7. A device according to Claim 5 or 6, characterized by the fact that the resistors that are used are voltage controllable resistors.
8. A device according to Claim 1, characterized by the fact that a capacitor that bears a charge can be connected to the second coil through a short-circuit switch controlled by an electronic circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3149789A DE3149789C1 (en) | 1981-12-16 | 1981-12-16 | Device for inductive identification of an information item |
| DEP3149789.6-53 | 1981-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1183927A true CA1183927A (en) | 1985-03-12 |
Family
ID=6148854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417825A Expired CA1183927A (en) | 1981-12-16 | 1982-12-15 | Device for the identification of information, particularly an electronic lock-key combination |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1183927A (en) |
| CH (1) | CH658735A5 (en) |
| DE (1) | DE3149789C1 (en) |
| FR (1) | FR2518285B1 (en) |
| NL (1) | NL8204801A (en) |
| SE (1) | SE463993B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440302A (en) * | 1990-07-16 | 1995-08-08 | Siemens Aktiengesellschaft | Apparatus for contactless data and energy transmission and systems containing the apparatus |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3221356A1 (en) * | 1981-12-16 | 1983-12-08 | Angewandte Digital Elektronik Gmbh, 2051 Brunstorf | Device for identifying an information item, particularly access control |
| DE3345829A1 (en) * | 1983-12-19 | 1985-06-27 | Központi Bányászati Fejlesztési Intézet, Budapest | Control system, particularly for registering persons in mining |
| DE3402737C1 (en) * | 1984-01-27 | 1985-08-01 | Angewandte Digital Elektronik Gmbh, 2051 Brunstorf | Mutual information transmission device |
| DE3427581A1 (en) * | 1984-07-26 | 1986-02-06 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR TRANSMITTING BINARY DATA BETWEEN A MOBILE DATA CARRIER AND A FIXED STATION |
| JPS63501452A (en) * | 1985-11-21 | 1988-06-02 | オ−ストラレイジャン・エレクトロニク・セントリ−・プロプライエタリ−・リミテッド | an electronic door lock |
| DE3544689A1 (en) * | 1985-12-18 | 1987-07-02 | Angewandte Digital Elektronik | DEVICE FOR INITIALIZING A CIRCUIT ACCORDING TO THE PRINCIPLE OF THE SYNCHRONOUS SWITCH |
| DE3614477A1 (en) * | 1986-04-29 | 1987-11-05 | Angewandte Digital Elektronik | DEVICE FOR BIDIRECTIONAL DATA TRANSFER |
| DE3630456A1 (en) * | 1986-09-06 | 1988-03-17 | Zeiss Ikon Ag | METHOD AND DEVICE FOR CONTACTLESS INFORMATION TRANSFER |
| DE3714195A1 (en) * | 1987-04-29 | 1988-11-10 | Fraunhofer Ges Forschung | METHOD FOR CONTACTLESS ENERGY AND DATA TRANSFER, AND MECHANICAL AND ELECTRONICALLY CODED LOCK |
| US5204819A (en) * | 1990-08-27 | 1993-04-20 | Ryan Michael C | Fluid delivery control apparatus |
| DE4031692C1 (en) * | 1990-10-02 | 1992-06-04 | Angewandte Digital Elektronik Gmbh, 2051 Brunstorf, De | Electronic key circuit in contactless chip=card - forms interface working with prim. electronic integrated circuit using interactive coils with ferrite cores buried in substrate |
| EP0710756B1 (en) * | 1994-11-07 | 2001-04-04 | Siemens Aktiengesellschaft | Antitheft system for a motor vehicle |
| ES2220962T3 (en) | 1995-03-10 | 2004-12-16 | Michael C. Ryan | PISTOL FOR CONTROL OF THE DISTRIBUTION OF THE FLUID. |
| DE19637964A1 (en) * | 1996-09-18 | 1998-03-19 | Diehl Ident Gmbh | Device for inductive high-frequency data exchange |
| DE102004020816A1 (en) | 2004-04-22 | 2005-11-17 | Atmel Germany Gmbh | Method and circuit for load modulation in a connection of a transmitting oscillating circuit and a receiving resonant circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2634303A1 (en) * | 1976-07-30 | 1978-02-02 | Knorr Bremse Gmbh | Electronic lock and key system - uses contactless data exchange and compares generated and stored signals |
| DE2657182A1 (en) * | 1976-12-17 | 1978-06-22 | Felde Juergen Zum | DEVICE FOR IDENTIFYING INFORMATION |
| DE3221356A1 (en) * | 1981-12-16 | 1983-12-08 | Angewandte Digital Elektronik Gmbh, 2051 Brunstorf | Device for identifying an information item, particularly access control |
| DE3244566A1 (en) * | 1982-12-02 | 1984-06-14 | Angewandte Digital Elektronik Gmbh, 2051 Brunstorf | Method and device for mutual information transmission between electronic lock and key |
-
1981
- 1981-12-16 DE DE3149789A patent/DE3149789C1/en not_active Expired
-
1982
- 1982-11-30 CH CH6933/82A patent/CH658735A5/en not_active IP Right Cessation
- 1982-12-10 NL NL8204801A patent/NL8204801A/en not_active Application Discontinuation
- 1982-12-14 SE SE8207153A patent/SE463993B/en not_active IP Right Cessation
- 1982-12-15 CA CA000417825A patent/CA1183927A/en not_active Expired
- 1982-12-15 FR FR8221018A patent/FR2518285B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440302A (en) * | 1990-07-16 | 1995-08-08 | Siemens Aktiengesellschaft | Apparatus for contactless data and energy transmission and systems containing the apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2518285A1 (en) | 1983-06-17 |
| DE3149789C1 (en) | 1983-08-25 |
| SE8207153D0 (en) | 1982-12-14 |
| CH658735A5 (en) | 1986-11-28 |
| NL8204801A (en) | 1983-07-18 |
| FR2518285B1 (en) | 1988-02-12 |
| SE8207153L (en) | 1983-06-17 |
| SE463993B (en) | 1991-02-18 |
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| MKEC | Expiry (correction) | ||
| MKEX | Expiry |