SU1495424A1 - Electronic permutation lock - Google Patents

Abstract

This invention relates to electronic code locks. The invention makes it possible to increase the secrecy of a lock by blocking work when dialing the wrong combination and allowing the lock to work after dialing the unlocking code. When the wrong code is dialed, the control trigger 7 is switched, resulting in the switching of the decoders 12 and 13. The lock is locked, and to unlock it, the unlocking code must be dialed, while dialing the control trigger 7 again and the decoders are switched. As a result, the lock is unlocked and in order to open it, the unlocking code must be dialed. 1 il.

Description

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The invention relates to a technique for protecting various objects from unauthorized access, in particular to electronic locks.

The purpose of the invention is to increase secrecy.

The drawing shows a functional diagram of the device.

The electronic code lock contains block 1 of code set, counters 2 and 3, elements OR 4-6, trigger 7, element AND 8, one-shot 9, unit 10 of comparison, executive block 11, decoders 12 and 13, block 14 of elements AND, drivers pulses 15-17,

The lock works as follows.

In the initial state, trigger 7 is in the set state, and counters 2 and 3 are in the reset state. At the same time, the signal of the unit level from the direct output of the trigger is fed to the resolution input of the second decoder

13 and allows it to work, and the zero signal from the inverse output of trigger 7 is fed to the enable input of the first decoder 12 and blocks its operation. As a result, the signals of unit levels from the outputs of the first decoder arrive at the second sxot of the corresponding elements of the block

14 elements And, and the signals of zero levels from the outputs of the second decoder 12 to the third inputs. When you press the key of the block 1 of the set of code, the single pulse, which passed the first element OR 4, is output to the counting input of the second counter 3. The established code from the output of the second counter 3 goes to the information inputs of the second decoder 13, which works As a result, a single damage signal appears on one of its outputs, which goes to the third input of the corresponding element of block 14 of the AND elements. If the key is pressed correctly, the signal from pressing the key is collected through the corresponding eleg The unit of 14 elements And 14 and the second element OR 5 to the counting input of the first counter 2. The established code from the output of the first counter 2 enters

to the second input of the comparison unit 10, the first input of which receives the code from the output of the second from the rocket 3. Since the key is pressed correctly, the codes on the inputs of the comparison block 10 are equal, and on the first output of the block is compared

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A single-level signal is present, which is fed to the second input of the element 8. With the further correct pressing of the keys, the lock operation is repeated until the last key of the opening code combination is pressed. In the first counter 2, the code will be set, in which the N-th bit (the N-number of digits in the open combination) is set to one, the state enters the first input of the And 8 element. As a result, And 8 opens and the signal of the single level From the entrance to the input of the executive unit 11, which is activated and the lock is opened. The signal of a single level from the output of the element And 8 is also fed to the input of the one-shot, which forms a pulse at the leading edge of the signal at the time of the lock triggering. From the output of the one-shot, the impulse comes through the third element OR

6 at the inputs of zeroing the counters, with the result that the lock returns to its original state. If while typing ko, yes, one of the keys is pressed incorrectly, then the codes on the inputs of the comparison block 10 are unequal. As a result, the zero-level signal from the first output of the comparator unit 10 is fed to the input of the trigger 7, and also blocks the element AND 8. The unit-level signal from the second output of the comparator unit 10 is fed to the input of the imaging unit 15, which forms a short pulse arriving at trigger zero reset input

7 and through the third element OR 6 to the inputs of zeroing counters. In this case, the lock is set in the initial state, with the only difference that trigger 7 is in the zero state. Therefore, the operation of the second zero level signal decoder 13 from the direct output of the trigger 7 is prohibited and the first decoder 12 is allowed to work with the signal of the unit level q of the inverse output of the trigger 7. As a result, the lock is blocked and to open it, you must first dial the unlock code,

Claims (1)

and then open the shod code. With the correct dialing of the unlock code, the unit-level signal from the output of the N-ro bit of the first counter 2 trig-1 Ep 7 is set to the single state, as a result of which, from the direct output, the unit-level signal from the direct output goes to the inputs of the 1 6 and 1 7 drivers. The shaper 17 forms a single impulse, which, having passed the element OR 6, enters the zeroing inputs of counters 2 and 3 and thus brings the lock to its initial state. Shaper 16 generates a single level signal on the leading edge of the signal from the output of trigger 7, which is delayed by the timing of the lock to its initial state. In addition, when installing the trigger 7, the decoders are switched. Thus, after dialing the unlocking code, the lock returns to its original state and in order to open it, it is necessary to dial the opening code. Invention Formula An electronic code lock containing a code dialing block, counters, OR elements, a trigger, an AND element, a single vibrator, a comparison block, an execution unit, an AND element block, the outputs of the first counter are connected to the first group of inputs of the comparison block, the AND element output connected to the input of the execution unit, characterized in that, in order to increase secrecy, it contains decoders, pulse shapers, and the outputs of the code set block are connected to the corresponding inputs of the first OR element and the first inputs of the AND block, its outputs connected to the inputs dmigef ten a- ev15 6 the second element OR, the output of the first element OR is connected to the counting inlet of the second counter, the outputs of which are connected to the second group of inputs of the comparison unit, information inputs, give the first decoder and information inputs of the second decoder, the outputs of the first and second decoders are respectively connected to the second and third inputs of the AND block, the output of the second OR element is connected to the counting input of the first counter, to the R-input of which the output of the third OR element and the setup input of the second counter are connected, the first. The output of the comparison unit is connected to the first input of the element I and the D input of the trigger, the counting input of which is additionally connected to the output of the higher bit of the first counter and the second input of the element And, the second output of the comparison unit through the first driver of the pulses is connected to the R input of the trigger and the first input the third OR element, the second input of which is connected to the output of the one-shot, the input connected to the executive unit, the direct call {one trigger is connected to the input The second house of resolution of the second decoder and through the second pulse shaper - with the third input of the element I, and through the third pulse shaper the direct trigger output is connected to the third - by the input of the third element OR, the inverse output of the trigger is connected to the resolution input of the first decoder. 20 25