RU2191241C1 - Electronic code lock - Google Patents

Abstract

FIELD: electronics. SUBSTANCE: the electronic code lock has a contact circuit, first, second and third counters, reference code unit, comparison circuit, first, second and third flip-flops, NOR gate, decoder, actuating mechanism, indicator, pulse generator, frequency divider, frequency selector switch, register and an OR EXCLUDING gate. The first and second inputs of the comparison circuit are connected respectively to the outputs of the register, and reference code unit, whose input is connected to the first input of the counter. The flip-flop setting input is connected to the output of the comparison circuit, and the output - to the strobing input of the decoder, whose output is connected to the input of the actuating mechanism. The counter count input is connected to the output of the contact circuit, setting input of the flip-flop, first input of the NOR gate, strobing input of the comparison circuit, clock input of the register and the first inputs of the frequency selector switch and the OR EXCLUDING gate. The second input of the NOR gate is connected to the direct output of the flip-flop and the inhibit input of the indicator, whose input is connected to the register output. The inverted output of the flip-flop is connected to the resetting inputs of the flip-flop, register and counter, whose second output is connected to the decoder input, the second input of the frequency selector switch is connected to the count input of the frequency divider and the generator output, whose resetting inputs are connected to the output of the NOR gate. The third input of the frequency selector is connected to the output of the frequency divider and the count input of the counter, whose first and second outputs are connected respectively to the flip- flop setting and reset inputs. The counter resetting input is connected to the output of the OR EXCLUDING gate, whose second input is connected to the flip-flop resetting input and the inverted output of the flip-flop. The output of the frequency selector switch is connected to the input of the counter, whose output is connected to the register information input. EFFECT: reduced probability of unauthorized revelation of code. 1 dwg _

Description

 The invention relates to the field of electronic technology and can be used in devices for protecting objects from unauthorized access.

 Known electronic combination lock (see RF patent 1802847 from 02.26.91, IPC: 5B47 / 00, "Electronic code blocking device", A.V. Karlov, A.A. Karlov, publ. 15.03.93, Bull. 10 ), containing a code dialing unit connected by the first output to the first counter, the outputs of the first counter are connected to the first inputs of the comparison unit, a generator, an RS-trigger, an actuator, a shaper of two frequencies, 2-OR elements, a second counter, frequency dividers, frequency switches, shaper. The second output of the code dialing unit is connected to the first input of the frequency switch, to the second input of which the third output of the code dialing unit, the first input of the driver and the counting input of the second counter are connected, the first outputs of which are connected to the second inputs of the comparison unit, the output connected to the second input of the driver and the fourth inputs of which are connected to the second outputs of the second counter. The first output of the driver is connected to the S-input of the RS-trigger, the R-input of which is connected to the second output of the driver and the actuator. The outputs of the RS-flip-flop are connected to the first inputs of the first 2AND-OR element, to the second inputs of which the fourth output of the code dialing unit is connected through a series-connected shaper of two frequencies and a generator. The output of the first 2-OR element is connected to the counting input of the frequency divider, the R-input of which with the R-input of the second counter is connected to the first output of the code dialing block. The first output of the frequency divider is connected to the third input of the frequency switch and the first input of the second 2-OR element, the second input of which is connected to the second output of the frequency divider. The third and fourth inputs of the second 2-OR element are connected to the first and second outputs of the frequency switch, the first output of which is connected to the fifth input of the driver. The output of the second element 2 AND-OR is connected to the counting input of the first counter.

 A disadvantage of the known code lock is the high probability of determining a reference code due to the remote measurement of the dialing time of each bit, starting from the zero state of the counter. Temporary increase in the frequency of enumerating digits is somewhat difficult, but does not exclude the possibility of determining a code, since the frequency of enumeration is limited from above by the need for visual control of the digits.

 Known electronic combination lock (see RF patent 2154722 from 08.27.99, IPC: E05B47 / 00. "Electronic combination lock." A.P. Martynov, D. B. Nikolaev, G. I. Shishkin, publ. 08.20.00 , Bull. 23), selected as a prototype and containing a first contact element, a comparison circuit, the first and second inputs of which are connected to the outputs of, respectively, the first counter and the reference code block, the input of which is connected to the first output of the second counter, the first trigger, installation the input of which is connected to the output of the comparison circuit, and the output to the gate input of the decoder, output One of which is connected to the input of the executive unit, a second contact element, an indicator, a coincidence element, and a second trigger. The first counter is made in the form of a reversible counter, the summing input of which is connected to the output of the first contact element, the installation input of the second trigger and the first input of the coincidence element. The subtracting input of the reversing counter is connected to the output of the second contact element and the second input of the coincidence element, and the output is connected to the indicator input, the inhibit input of which is connected to the reset inputs of the first trigger, the first and second counters, and the output of the second trigger, the reset input of which is connected to the decoder input and the second output of the second counter, the counting input of which is connected to the gate input of the comparison circuit and the output of the matching element.

 The disadvantages of the prototype is the high probability of unauthorized determination of the reference code due to the remote measurement of the dialing time of each digit, starting from the zero digit of the counter, and identifying the sequence of pressing buttons.

 The problem solved by the invention is the creation of an electronic combination lock with a low probability of unauthorized determination of the reference code.

 The technical result, which consists in reducing the likelihood of unauthorized detection of the reference code, is achieved by the fact that the electronic code lock contains a contact element, two counters, a counting input and the first output of the second of which are connected, respectively, with the gate input of the comparison circuit and the input of the reference code block whose output is connected to the second input of the comparison circuit, the output of which is connected to the installation input of the first trigger, the output of which is connected to the gate input of the decoder, the output to of which is connected to the input of the actuator, the second trigger, the direct output of which is connected to the indicator inhibit input, and the coincidence element, the third trigger and counter, register, pulse generator, frequency divider, frequency switch, EXCLUSIVE OR element, and the coincidence element are made in the form the OR-NOT element, the first input of which is connected to the output of the contact element, the gating input of the comparison circuit, the first input connected to the indicator input, as well as the clock input of the register, the first input of the switch I frequency, the first input of the element EXCLUSIVE OR and the installation input of the third trigger, the inverse output of which is connected to the reset inputs of the first trigger, register and second counter, the second output of which is connected to the decoder input, the inverse output of the second trigger is connected to the reset input of the third trigger and the second input an EXCLUSIVE OR element, the output of which is connected to the reset input of the third counter, the first and second outputs of which are connected to the installation and reset inputs, respectively, of the second trigger, the direct output of which connected to the second input of the OR-NOT element, the output of which is connected to the reset inputs of the pulse generator and the frequency divider, the counting input of which is connected to the output of the pulse generator and the second input of the frequency switch, and the output to the counting input of the third counter and the third input of the frequency switch, the output of which is connected to the counting input of the first counter, the output of which is connected to the information input of the register, the output of which is connected to the indicator input.

 The specified set of features allows you to reduce the likelihood of unauthorized determination of the reference code by remotely measuring the moment the contact element is turned on by ensuring a random initial state of the first counter at the time of entering each code symbol.

 The drawing shows a structural diagram of an electronic combination lock.

 The electronic combination lock contains contact element 1, first 2, second 3 and third 4 counters, block 5 of the reference code, comparison circuit 6, first 7, second 8 and third 9 triggers, element 10 OR NOT, decoder 11, actuator 12, indicator 13, pulse generator 14, frequency divider 15, frequency switch 16, register 17 and element 18 EXCLUSIVE OR. The first and second inputs of the comparison circuit 6 are connected to the outputs of, respectively, the register 17 and block 5 of the reference code, the input of which is connected to the first output of the counter 3. The installation input of the trigger 7 is connected to the output of the comparison circuit 6, and the output is connected to the gate input of the decoder 11, the output of which is connected to the input of the actuator 12. The counting input of the counter 3 is connected to the output of the contact element 1, the installation input of the trigger 9, the first input of the element 10 OR NOT, the gate input of the comparison circuit 6, the clock input of the register 17 and the first input frequency selector 16 and the exclusive OR element 18. The second input of the element 10 is NOT connected to the direct output of the trigger 8 and the ban input of the indicator 13, the input of which is connected to the output of the register 17. The inverse output of the trigger 9 is connected to the reset inputs of the trigger 7, register 17 and counter 3, the second output of which is connected to the input decoder 11. The second input of the frequency switch 16 is connected to the counting input of the frequency divider 15 and the output of the generator 14, the reset inputs of which are connected to the output of the element 10 OR NOT. The third input of the frequency switch 16 is connected to the output of the frequency divider 15 and the counting input of the counter 4, the first and second outputs of which are connected, respectively, to the inputs of the installation and reset of the trigger 8. The reset input of the counter 4 is connected to the output of the element EXCLUSIVE OR, the second input of which is connected with the reset input of the trigger 9 and the inverse output of the trigger 8. The output of the frequency switch 16 is connected to the input of the counter 2, the output of which is connected to the information input of the register 17.

 Contact element 1 can be made in the form of a button with a device for protection against contact bounce (see USSR author's certificate 1202046, MKI: N 03 K 5/153, publ. 30.12.85, Bul. 48). Counters 2, 3 and 4 are similar and can be performed on the 564IE10 chip. Block 5 of the reference code can be performed on non-volatile memory cells (see USSR author's certificate 845287, MKI: N 03 K 19/16, publ. 02.07.81 g, Bull. 25). The comparison circuit 6 can be performed on the 564IP2 chip. Triggers 7 and 8 are similar and can be performed on the 564TM2 chip. The trigger 9 can also be performed on the chip 564TM2, while its synchronization input is connected to the contact element 1 through the inverter of the chip 564LN2. Element 10 OR NOT can be performed on the 564LE5 chip, and the decoder 11 on the 564ID1 chip. The actuator 12 is an electromagnetic mechanism controlled by a composite transistor. Indicator 13 can be performed according to the scheme (see the Collection of information sheets RD 11.0488.3-89, sheet 4). The pulse generator 14 can be performed on 564LN2 and 564LA7 microcircuits (see the book by S. A. Biryukov “Digital Devices on MOS Integrated Circuits”, Fig. 114, a). The frequency divider 15 can be performed on the 564IE10 chip, the frequency switch 16 on the 564KP2 chip, and the register 17 on the 564IR9 chip. The element 18 EXCLUSIVE OR may be performed on the chip 564LP2.

 Electronic combination lock operates as follows.

 When the power is turned on, trigger 8 is set to its initial zero state (initial setup circuit not shown). At the direct output of trigger 8, a signal is set that holds the indicator 13 in the canceled state, and the signal from the output of element 10 OR NOT blocks the operation of the generator 14 and the frequency divider 15. The signal from the inverse output of trigger 8 holds the counter 4 and trigger 9 in the initial zero state. The signal from the inverse output of trigger 9 sets trigger 7, counter 3, and register 17 to zero. At the output of trigger 7, a signal is installed that allows the actuator 12 to operate. The status of the counter 3 outputs from the block 5 of the reference code to the corresponding input of the comparison circuit 6 the first digit of the lock unlock code. At the same time, the signal from the counter 3 prohibits the passage of the signal from the output of the trigger 7 to the actuator 12 through the decoder 11. The electronic code lock is in standby mode.

 When the contact element 1 is closed for the first time, the signal from the output of element 10 OR NOT allows the operation of the generator 14 and the frequency divider 15, and the signal from the output of the element 18 EXCLUSIVE OR allows the operation of the counter 4. The voltage pulses from the output of the generator 14 through the frequency divider 15 are fed to the counting input counter 4, which leads to the appearance on the corresponding output signal, setting the trigger 8 in a single state. At the same time, indicator 13 lights up (information on the zero state of register 17 is displayed on it), a signal is transmitted through an OR-NOT element 10, which allows the operation of the generator 14 and the frequency divider 15, and the signal from the inverted output of trigger 8 allows the setting of trigger 9 in a single state and through element 18 EXCLUSIVE OR sets counter 4 to the zero state. The frequency switch 16 supplies the counter 2 pulses from the generator 14, changing its state with a high frequency (without displaying on the indicator 13), which makes it difficult to determine the reference code by remotely measuring the set time of each discharge.

 At the first opening of the contact element 1, the trigger 9 switches to the single state, which leads to the removal of the reset signal from the counter 3, the trigger 7 and the register 17. The frequency switch 16 starts to send to the counter 2 pulses from the frequency divider 15, changing its state with a low frequency . The indicator 13 displays information about the current state of the counter 2. Thus, the first closure and opening of the contact element 1 transfers the lock from standby to working.

 The first digit of the code is dialed by closing the contact element 1 at the moment when the desired digit is displayed on the indicator 13. In this case, the status of counter 2 (corresponding to the first digit of the code) is recorded in register 17 and a gate pulse is generated for the comparison circuit 6. If at the moment of arrival of the gating pulse the codes coming from register 17 and block 5 of the reference code did not match, then trigger 7 is switched off, making the actuator 12 impossible to operate, and if the codes match, then the state of trigger 7 does not change. When the contact element 1 is opened, the counter 3 switches, as a result of which the next digit of the code appears at the output of block 5 of the reference code.

 The remaining digits of the code are dialed in the same way.

 When typing the last digit of the code, the opening of the contact element 1 leads to the formation on the corresponding output of the counter 3 of the signal removing the ban on the actuation mechanism 12. Actuator 12 is triggered if, when entering the code, all numbers coincide, i.e. trigger 7 has not changed its initial state.

 If the pause between the dialing of digits is comparable to the dialing time of all digits of the code, then counter 4, sequentially changing its state, gives a signal at the corresponding output, bringing trigger 8 to the initial zero state, causing the counter 3, trigger 7 and register 17 to be reset to zero. .

 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 contact element, two counters, a counting input and the first output of the second of which are connected respectively to the gate input of the comparison circuit and the input of the reference code block, the output of which is connected to the second input of the comparison circuit, the output of which is connected to the installation input of the first trigger, the output of which is connected to the gate input of the decoder, the output of which is connected to the input of the actuator, a second trigger, the direct output of which is connected to the indicator inhibit input, and coincidence, characterized in that the third trigger and counter, register, pulse generator, frequency divider, frequency switch, EXCLUSIVE OR element are entered, and the coincidence element is made in the form of an OR-NOT element, the first input of which is connected to the output of the contact element, the gating input comparison circuit, the first input connected to the indicator input, as well as the clock input of the register, the first input of the frequency switch, the first input of the EXCLUSIVE OR element and the installation input of the third trigger, whose inverse output is connected to the reset inputs of the first trigger, register and second counter, the second output of which is connected to the decoder input, the inverse output of the second trigger is connected to the reset input of the third trigger and the second input of the EXCLUSIVE OR element, the output of which is connected to the reset input of the third counter, the first and second outputs which are connected to the inputs of the installation and reset, respectively, of the second trigger, the direct output of which is connected to the second input of the OR-NOT element, the output of which is connected to the reset inputs of the pulse generator and divides For a frequency, the counting input of which is connected to the output of the pulse generator and the second input of the frequency switch, and the output to the counting input of the third counter and the third input of the frequency switch, the output of which is connected to the counting input of the first counter, the output of which is connected to the information input of the register, the output of which connected to the indicator input.