SU1612069A1 - Electronic lock - Google Patents

Abstract

The invention relates to the field of electronic protection of structures in which equipment is placed, and can be used to protect against unauthorized access to cabinets, racks, rooms. The purpose of the invention is to improve usability by combining control functions — a set of zeros and units of code advancement and reset devices in two control elements - schemes 1 and 2. The device is reset by simultaneously acting on schemes 1 and 2, and then successively terminating the effect on scheme 1 and Hem 2, wherein the trigger is recorded in the zero and the first bit of the register 5 - one. When circuit 1 is applied to the first bit of flip-flop 5, zero is recorded, and circuit 2 is acted with one, and the register contents are shifted. When the first unit reaches the last bit, the remaining bits of the register 5 are polled. If the contents match the preset, then the actuator 3 is activated, if not, the unauthorized conditions indication block 13 is triggered. 1 il.

Description

The invention relates to devices for protection against unauthorized actions, in particular to the field of electronic protection of structures to which access is permitted to a limited number of persons.

The aim of the invention is to improve the usability of the electronic lock.

The drawing shows a functional diagram of the device.

An electronic lock consists of circuit 1 of a set of zeros, circuit 2 of a set of units, actuator 3, trigger 4, n-bit shift register 5, (l — 1) coding switching elements 6, four elements AND 7-10, element OR — NOT 11 , inverter 12 and block 13 indication of unauthorized actions.

The device operates as follows.

Initially, the device is reset by simultaneously acting on set 1 of zeros and scheme 2 of sets of units, the effect on scheme 1 of sets of zeros, on scheme .2 sets of units ends and a code combination is typed by manipulating the effects on schemes 1 and 2.

With the simultaneous action of 2 units and circuit 1 of zeros on the circuit, positive pulses generated at the output 1 of circuit 1 and the output of circuit 2 pass through the And 9 element to the inputs R of register 5 and trigger 4, setting these elements to the zero state. In this case, the positive pulse from circuit 2 does not arrive at input S of trigger 4, since it is prohibited on element And 8 by a negative pulse from output 1 of circuit 1.

At the end of the impact on the circuit 1 by a trailing positive front from the output of the OR-NOT 11 element (inverted back negative front of the pulse from the output 2 of circuit 1), the state of trigger 4 does not change. At the same time, the inhibitory negative pulse arriving at the input 1 of the And 8 element from the output of I of circuit 1 is removed. Since the effect on the circuit 2 is not stopped, and at the second output of trigger 4 it is a high level, a positive pulse is formed at the output of the And 8 element, which sets the trigger 4 to a single state. At the inverse output of the trigger 4 is set to a low level signal, the closing element And 8.

At the end of the action on circuit 2, a negative drop is formed at its output, which at the output of the OR-NOT 11 element forms a positive drop, which overwrites the unit recorded in trigger 4 into the first bit of register 5 and writes zero to trigger 4. That is, by the time the actions on both schemes were completed, the device was reset and the unit was written to the first bit of register 5.

Next, the desired combination is dialed. When acting on circuit 1 (entry 0) in register 5, only the information shift operation is performed (by the trailing edge of the pulse generated at the output 2 of circuit 1, i.e., at the output of the element OR - NOT H, since the input of trigger 4 is connected to a common power point). Thus, when acting on circuit 1, zero is recorded in trigger 4 and the information in register 5 is advanced by one clock cycle.

When acting on circuit 2, trigger 4 (which at the time of recording is always in the zero state as a result of its previous state) receives a positive impulse from the output of open element And 2, setting trigger 4 to the state of unity, closing element And 8. At the end of the action, Scheme 2 through the OR — NOT 11 element by a positive edge, register 5 advances one clock cycle. In this case, by the time of advancement at the output S of trigger 4, the positive impulse has already ended, since when the trigger 4 is in the state of unit 1, the And 8 element is closed. Thus, zero is recorded in trigger 4.

At the end of the set, the first recorded unit reaches the last bit of register 5, forming a polling signal received at the nth input of AND element 7, and zero is recorded in trigger 4, since its D input is low.

At the same time, information from the direct and inverse outputs of register 5, except for the last discharge, through the coding switching elements 6, is supplied to the inputs of the element And 7. Using the coding switching elements 6, the device is programmed for the appropriate combination (a set of code combination). If, as a result of dialing, the required code combination is received on element 6, then at the output of element And 7 a high-level signal appears, by which the actuator 3 will work, by which access to the object is allowed (the door is opened, the contacts of the object's controls are unlocked, etc. .). If, as a result of a set, a false code combination is received in register 5, a high level will appear at the output of the last digit of register 5, and a low level signal will appear at the output of the And 7 element, which through the inverter 12 will go to the second input of the And 10. The signal from the output of the And element 10 triggered block 13 indication of unauthorized actions.

Claims (1)

Claim An electronic lock containing a set of zeros, a set of units, an actuator, a trigger whose direct output is connected to the information input of the η-bit shift register, the first to (a – 1) -th outputs of which are connected to the first contacts of the corresponding code ruyuschih 5 members, wherein the inverted output of the same bit is connected to the second contact element encoding, a third terminal coding elements are connected to respective inputs of the first AND elements that _uo, characterized in that, in order to increase the convenience of IP For use, AND elements, an OR-NOT element, an inverter and a block of indication of unauthorized actions are additionally introduced into the lock, the first output of the set of zeros being connected to the first input of the second AND element, the output of which is connected to the S-input of the trigger, whose inverse output is connected to the second input of the second AND element, the third input of which is connected to the output of the set of units, the first input of the OR — NOT element and the first input of the third AND element, the second input of the third AND element connected to the second output of the set of zeros and to the second input of the OR — NOT element, and the output of the third AND element is connected to the R-input of the trigger and the R-input of the shift register, the output of the OR – NOT element is connected to the synchronization inputs of the trigger and the shift register, the direct output of the ηth digit of the shift register is connected to η-th input of the first element And and the first input of the fourth element And, the second input of which is connected to the output of the inverter, and the output of the first element And is connected to the inputs of the actuator and inverter, and the output of the fourth element And is connected to the input of the display unit authorized actions.