RU2159315C1 - Electronic code lock - Google Patents

Abstract

FIELD: electronic code locks, applicable in protection of objects against access of strangers. SUBSTANCE: the electronic code lock input line is connected to a group of inputs of the comparison unit, whose first output is connected to the input of the actuating unit. The second output of the comparison unit is connected to the input of the first counter, whose output is connected to the input of the second counter, whose group of outputs is connected to the group of inputs of the display unit and to the second group of inputs of the controllable code converter, whose first group of inputs is connected to the group of outputs of the memory unit; the group of outputs of the controllable code converter is connected to the second group of inputs of the comparison unit. EFFECT: simplified design of electronic lock and simplified servicing of it. 1 dwg

Description

 The invention relates to the field of electronic technology and can be used to protect various objects from unauthorized access.

 The electronic code lock is known (see USSR author's certificate N 1339229 of 04/08/86, MKI: E 05 B 47/00, "Code lock", M.N. Bobov, V.V. Epikhin, A.A. Obukhovich, publ. 09/23/88. Bull. N 35), containing a code dialing unit, the first output of which is connected to the first input of the false code detection unit, the second output is connected to the first input of the code reception unit, the third output is connected to the first input of the unlock code reception unit, the second the input of which is connected to the output of the trigger and the first input of the element I. The output of the block for receiving the unlock code is connected to the second input of the element coagulant and whose output is connected to the mounting entry counter. The counter counter input is connected to the output of the false code detection unit and to the first input of the switch, the second input of which is connected to the counter output. The first output of the switch is connected to the second input of the code receiving unit and the first input of the trigger. The second output of the switch is connected to the first input of the time relay, the second input of which is connected to the first output of the code receiving unit and the second input of the trigger. The first output of the time relay is connected to the third input of the code receiving unit and the second input of the false code detection unit. The second output of the time relay is connected to the first input of the executive unit, to the second input of which the second output of the code receiving unit is connected. The third output of the time relay is connected to the first input of the additional element And, to the second input of which the trigger output is NOT connected through the element, and the indicator input is connected to the output of the additional element And.

 A disadvantage of the known electronic combination lock is the high probability of its opening, associated with a small number of necessary attempts to select a code.

Indeed, if the number of possible values of the unlock code is equal to the number of possible values of the unlock code and is M = 2 ^m , where m is the number of binary bits of the code, then the maximum number of possible attempts to select a code to open the lock is 2M.

 The electronic code lock is known (see USSR author's certificate N 1262018 of 04.24.85, MKI: E 05 B 47/00, 47/02, 49/00, "Electronic lock", S. P. Klokotsky, MN Bobov , publ. 07.10.86. Bull. N 37), selected for the prototype and containing a code set block, the group of outputs of which is connected to the group of inputs of the code receiving unit, the group of outputs of which is connected to the first group of inputs of the comparison unit, the first output of which is connected to the first the entrance of the executive unit. An additional output of the code dialing unit is connected to the first input of the code receiving unit and the input of the control unit, the first output of which is connected to the second input of the code receiving unit. The second output of the control unit is connected to the second input of the executive unit, the third output is connected to the first input of the counter, the second input of which is connected to the second output of the comparison unit, and the output is connected to the input of an additional counter, the outputs of which are connected to the inputs of the display unit and connected to the first through the decoder a group of selector inputs, a second memory block is connected to the second group of inputs, and N additional memory blocks are connected to N groups of additional inputs, a group will be added to the selector outputs Effective inputs of the comparison unit. The lack of analogue is reduced in the prototype.

 A disadvantage of the known electronic combination lock is its complexity, determined by the need to use a large number of memory blocks and replace a large number of codes when one of them is compromised, due to a possible violation of the state of the additional counter after the unauthorized person opens the lock.

 The task to which the invention is directed is to create a simplified electronic combination lock and reduce the complexity of its operation.

 The technical result, which consists in simplifying the circuit of the electronic combination lock and its operation, is achieved by the fact that in the electronic combination lock containing a memory unit and an input bus connected to the group of inputs of the code receiving unit, the group of outputs of which is connected to the first group of inputs of the comparison unit, the first the output of which is connected to the input of the executive unit, and the second output is connected to the input of the first counter, the output of which is connected to the input of the second counter, the group of outputs of which is connected to the group of inputs of the display unit, cc the controllable code converter is one, the first group of inputs of which is connected to the group of outputs of the memory block, the second group of inputs - with the group of outputs of the second counter, and the group of outputs - with the second group of inputs of the comparison unit.

 The specified set of features allows you to simplify the electronic code lock by eliminating additional memory blocks and its operation by eliminating the need to replace codes when compromising one of them. Moreover, the probability of opening the lock does not increase, because, as in the prototype, in the present invention, the unlock code of the lock changes after each change in the state of the second counter, not only by connecting another memory block, but by converting the code of one memory block using a managed code converter.

 The drawing shows a diagram of an electronic combination lock.

 The electronic combination lock contains a code receiving unit 1, a comparison unit 2, an executive unit 3, a controlled code converter 4, a first counter 5, a second counter 6, an indication unit 7, a memory unit 8, and an input bus 9.

 The input bus 9 of the electronic code lock is connected to the input group of the code receiving unit 1, the output group of which is connected to the first group of inputs of the comparison unit 2, the first output of which is connected to the input of the executive unit 3. The second output of the comparison unit 2 is connected to the input of the first counter 5, output which is connected to the input of the second counter 6, the group of outputs of which is connected to the group of inputs of the display unit 7 and to the second group of inputs of the managed code converter 4, the first group of inputs of which is connected to the group of outputs flash memory 8; the group of outputs of the managed code converter 4 is connected to the second group of inputs of the comparison unit 2.

 The code receiving unit 1 can be performed on 1533TL2 microcircuits (Schmidt inverting triggers). Block 2 code comparison can be performed on the comparator 1533 SP 1. The first counter 5 and the second counter 6 are similar and made according to the scheme of the integrated counter 1533IE10. The memory unit 8 can be performed on non-volatile memory cells (see USSR Author's Certificate N845287 class H 03 K 19/16, published July 2, 1997). Code converter 4 is made on 1533LP5 microcircuits (exclusive OR logic elements) using a permutation block circuit (IS Potemkin. "Functional units of digital automation". - M .: Energoatomizdat, 1988, (Fig. 3.23. A)) namely, the first group of inputs of the code converter is connected to the first inputs of the exclusive-OR elements, the second group of inputs to the second inputs of the exclusive-OR elements; the outputs of the exclusive-OR elements are connected to the inputs of the permutation block, the outputs of which are the outputs of the code converter. The Executive unit 3 is an electromagnetic mechanism controlled by a composite transistor. Indication unit 7 can be performed on the ALS321A indicators and the decoder chip 514ID2 according to the scheme (Collection of information sheets RD11.0488.3-89, sheet 4).

 Electronic combination lock operates as follows.

 When the lock is unlocked, the characters of the dialed code are entered into the code receiving unit 1. If the code entered in the code receiving unit 1 is equal to the current reference code coming from the output of the code converter to the input of the code comparison unit 2, then an enable signal is generated at the first output of the code comparison unit 2, which is fed to the input of the executive unit 3.

 If the code entered in the code receiving unit 1 is not equal to the current reference code coming from the output of the code converter 4 to the second input of the comparison unit 2, then a inhibit signal is generated at the first output of the comparison unit 2, which goes to the input of the executive unit 3, and the second output is an enable signal, which is fed to the first input of counter 5 of the number of attempts to select a code. In this case, the executive unit does not turn on, and a unit is added to counter 5. Moreover, if the permissible number of entries of false codes is not exceeded, then the signal is not generated at the output of counter 5 and the contents of the additional counter 6 are not changed, and, therefore, the value of the valid reference code issued to the input of comparison unit 2 is stored. If the permissible number of entries of false codes is exceeded, then a signal is generated at the output of counter 5, by which the contents of counter 6 are increased by one. In this case, the code converter 4 performs a combination conversion of the code coming from the output of the memory unit 8, and the next code number connected to the comparison unit 2 is displayed on the display unit 7. After that, to open the lock, you need to dial another code combination.

If the number of possible values of the opening code, as in the prototype, is M = 2 ^m , and the capacity of counter 5 is L = M / K, then the probability of opening the lock on the first try is 1 / M and then linearly increases to L / M, after which an additional counter 6 is triggered and the code converter 4 performs a combination conversion of the code, and the probability of opening the lock on the next attempt decreases to 1 / M and then linearly increases to L / M, after which the next combination conversion is performed. After the last combination transformation is completed, the conversion cycle ends, and the probability of opening the lock remains at the L / M level. In the next cycle of transformations, the likelihood of opening the lock likewise increases from L / M to 2L / M. In the penultimate cycle, this probability increases from (K-2) L / M to (K-1) L / M. In the last cycle, during the first conversion, the probability of opening the lock increases from (K-1) L / M to KL / M = 1 and the lock is guaranteed to be unlocked. Moreover, the maximum number of possible attempts to select a code for opening a lock is MN-L (N-1), N is the number of combinational permutations (maximum m!).

 Thus, the description of the work confirms the performance of the claimed electronic combination lock. A laboratory prototype of an electronic combination lock was manufactured, tests of which confirmed the feasibility and practical value of the claimed facility.

Claims (1)

 An electronic combination lock containing a memory unit and an input bus connected to the group of inputs of the code receiving unit, the group of outputs of which is connected to the first group of inputs of the comparison unit, the first output of which is connected to the input of the executive unit, and the second output is connected to the input of the first counter, the output of which connected to the input of the second counter, the group of outputs of which is connected to the group of inputs of the display unit, characterized in that a controlled code converter is introduced, the first group of inputs of which is connected to the group of outputs of the block amyati, the second group of inputs - with the group of outputs of the second counter, and outputs a group - with a second group of inputs of the comparator.