RU2057246C1 - Electronic lock - Google Patents

Abstract

FIELD: lock production. SUBSTANCE: device has typing block 1, block 2 to eliminate flutter, block 3 for prohibition, block 4 for holding, block 5 for code commutation, counter block 6, reference code block 7, block 9 for changing code level, executive block 10, counter 8 for accounting number of typing false codes, member 11 for delaying, block 12 to alarm. EFFECT: high reliability. 3 cl, 7 dwg

Description

 The invention relates to electronic locks and can be used in the technique of protecting various objects from access by unauthorized persons.

 An electronic-code lock is known (a. P. 1406325), where, when a button whose number corresponds to the set sequence of code digits is pressed, from the multiplexer output and from the pressed button, logical units write the unit to the counter through the AND element. The latter sets the address of the information input of the multiplexer, to which a button is connected, corresponding to the next digit of the installed code. With the correct set of buttons of the set code, a combination of binary signals appears on the counter outputs, which, through the decoder, activates the lock actuator. In case of any violation of the correct code dialing, the specified combination of logical units does not occur and the counter is reset to zero, returning the device to its original position.

 The disadvantage of this electronic code lock is low secrecy, due to the lack of speed in changing the code and overwriting of the individual buttons and adjacent places involved in the correct code set.

 A code lock is also known [1] where, in the case of dialing an incorrect code, the signal from the false code detection unit through the switch includes a time relay, the signal from which includes an indicator. Actuation of the executive unit does not occur. In the counter, the number of sets of the wrong code is counted, and when the set number is reached in the counter, the lock operation is blocked.

 The disadvantage of this combination lock is the insufficient depth of the code, the absence of an alarm.

 The proposed electronic lock containing a code dialing unit, an exposure unit, a counter of the number of false code sets, a switch, a reference code unit, an executive unit, further comprises blocks of chatter, prohibition, counters, code depth switching, a delay element, an alarm signaling unit, and the output of the code dialing block is connected to the first inputs of the chatter and ban blocks, the output of the number of false code sets connected to the first inputs of the counter blocks and the counter of which the holder is connected to the alarm enable block, the input of which is connected to the second counter input of the number of false code sets, while the output of the chatter elimination unit through the shutter block is connected to the second inputs of the counter and ban blocks, the third input of the reference code block connected to the output, the output of the elimination block bounce is connected to the first input of the switch, the output of the counter block connected to the third input, the output of which is connected to the input of the reference code block, while the switch is connected to the output of the counter block, and the second output through the code depth switching block with the executive block, in addition, the switch contains two NAND elements for two inputs, NAND elements for three inputs, inverters, while the first inputs of the NAND elements the first input of the switch, and the second inputs of the three-input and second two-input elements AND are NOT the second input of the switch and are connected to the inputs of the inverters, the outputs of which are the second output of the switch, while the output of the first inverter is connected to the second input of the first of an I-NOT input terminal, the output of which is the first output of the switch and connected to the outputs of the three-input and second two-input AND elements, while the outputs of subsequent inverters, except the last inverter, are connected to the third inputs of the three-input AND elements, in addition, the switching unit the code depth contains an inverter, two-input AND-NOT elements, a multi-input AND-NOT element, contact elements, the inverter input, the second inputs of two-input AND elements NOT being the input of the code depth switching block, the first input The two-input AND-NOT elements through contact elements are connected to the zero bus, the outputs of the inverter and the two-input AND-NOT elements are connected to the inputs of the multi-input AND-NOT element, the output of which is the output of the code depth switching block.

 The claimed invention, aimed at creating an electronic lock with increased secrecy, easy to use, allows to achieve a new technical result, which consists in increasing the secrecy of the lock, achieved by the rapid change of the reference code, the rapid change in the code depth, which can be almost unlimited.

 The use of two controls provides ease of use, the secrecy of typing, eliminating the erasure of individual buttons and adjacent places, since both elements are involved in the set.

 In FIG. 1 shows a block diagram of an electronic lock (the operation of the block diagram is considered on the example of a circuit performed on three counters, however, the number of counters depending on the required code depth can be arbitrary); in FIG. 2-7, respectively, of a prohibition block, an exposure block, a switch, a counter block, a reference code block, a code depth switching block.

 The lock contains a code dialing block 1, a chatter elimination block 2, a prohibition block 3, a shutter block 4, a switch 5, a counter block 6, a reference code block 7, a counter 8 of the number of false code sets, a code depth switching block 9, an executive block 10, an element 11 delays, block 12 enable alarm.

 Block 1 code set is intended for code dialing and contains two control elements, and block 2 eliminates bounce is designed to eliminate false control pulses.

 Block 3 prohibits the counting of the pulses of the code on the counters of the block 6 counters in case of erroneous dialing of the code. The prohibition block 3 can be performed according to the circuit shown in FIG. 2. It contains two D-flip-flops 13 and 14, and the inverse output of the D-flip-flop 13 is connected to the input S of the D-flip-flop 14.

 Block 3 prohibition works as follows.

 Through the first input of the prohibition block 3, the counting inputs C of the D-flip-flops 13 and 14 receive code pulses (level “0”) from the code dialing elements of the code set block 1, and the pulses corresponding to “I” go to the trigger 13 of the prohibition block 3, pulses corresponding to "0" on trigger 14.

 Through the second input of block 3 of the ban on the inputs of D-flip-flops, signals from the output of block 7 of the reference code are received. In the event of an error while entering the code in the prohibition unit 3, an account prohibition signal (level "I") is generated, which is output from the prohibition unit 3 to the input of the counter unit 6 (to the inputs of the EC-permission of the counter account) (Fig. 5). At the same time, the inhibit signal (level "I") is sent to the first input of block 8 of the counter of the number of false code sets (to the counting input of the C-counter), which triggers the alarm activation circuit for a given number of attempts to incorrectly dial the code.

 Through the third input of the inhibit block 3, the output of the exposure unit 4 when entering the code enters the level “0” (to the input of the S-trigger 13 and the input of the R-trigger 14).

 The shutter block 4 is designed to save the permission for the open state of the executive block 10 in the case of the correct dialing of the code (the lock is open), which after a set time interval from the moment of the last dialing of the code leads the ban block 3, the counter block 6 and the executive block 10 (the lock is closed). The set intervals are counted by block 4 after typing each character of the code, and if the character is incorrectly typed for the same time interval, it prohibits the perception of code characters in block 6 of counters, extending the prohibition for all subsequent typed code characters, even if they are correct.

 The exposure unit 4 can be made according to the circuit shown in FIG. 3. Exposure unit 4 consists of resistors 15-17, diode 18, capacitor 19, inverter 20. Code pulses from the output of unit 2 for eliminating bounce are received at the input of exposure unit 4. From the output of the endurance block 4, the level “0” when entering the code is input to the third input of the prohibition block 3 and the first input of the counter block 6 (to the R-reset inputs of the counters). The delay time between attempts to enter the code is set by a variable resistor circuit RP, R, C.

 The switch 5 is designed to distribute the pulses of the code on the counters of the block 6 counters. Switch 5 may be configured as shown in FIG. 4. The switch 5 contains the elements AND 21-23, of which the elements AND 21 and 23 two-input, 22 three-input and inverters 24-26.

 Switch 5 operates as follows.

 The pulses of the code are received at the second input of the switch 5, which are fed to the inputs of the NAND 21-23 elements, commuting the sequentially entered code to the corresponding counters of the counter block 6.

 The first input of switch 5 from the counters of block 6 counters from the first output of this block receives signals at the inputs of the NAND elements 22 and 23 and the inputs of inverters 24-26, informing about the filling of the counters, starting from the "younger" counter 27 of the block 6 counters, in series the input code, and through the first output of the switch 5 is organized the arrival of pulses of the code on the second input of the block 6 counters in the respective counters as the previous ones are filled. With the correct set of code through the second output of the switch 5, the signals of the level "0" are fed to the input of block 9 switching the depth of the code.

 Block 9 switching the depth of the code is used to include in the work of the counters, providing the required code depth. The code depth switching unit 9 can be performed according to the circuit shown in FIG. 6. Block 9 switching the depth of the code consists of one inverter 30, two two-input elements NAND 31 and 32, contact elements 33 and 34, one three-input element NAND 35.

 Block 9 switch the depth of the code as follows.

 The input of block 9 switching the depth of the code from the second output of the switch 5 receives signals of the level "0" when you enter the correct code to the input of the inverter 30, which has one input to ensure the minimum duration of the "code word" equal to the number of outputs of the first "younger" counter 27 block 6 counters, and to one of the inputs of the two-input elements AND-NOT 31 and 32, the second outputs of which can be connected via contact elements 33 and 34 to the zero bus and when the contacts 33 and 34 are closed at the outputs of the two-input elements AND-NOT 31 and 32 level "I" is formed, otorrhea trehvhodovy supplied to AND-NO element 35, shortening the "codeword" the number counter unit 6 outputs counters (minimal duration variant "codeword").

 The duration of the "code word" is maximum in the case when none of the first inputs of the two-input elements AND is NOT closed on the zero bus. Changing the duration of the "code word" is made from the "senior" counter 29 to the "younger" counter 27.

 Block 7 of the reference code may be performed according to the circuit shown in FIG. 7.

 Block 7 of the reference code consists of contact elements 36, the combination of open and closed contacts of which forms a reference code (a closed contact corresponds to a logic level "I", and an open contact "0"). The input of block 7 of the reference code is connected through the second output of block 6 counters to the outputs of the counters. When typing, the dialed code is sequentially compared with the reference code.

 If an error is made when typing the code, i.e. the input code does not coincide with the combination of closed and open contacts 36 in block 7 of the reference code, then a signal appears at the output of block 7 of the reference code, which is fed to the second input of block 3 of the ban, where a stop signal is generated in the counters (EC enable inputs) of block 6 counters before the end of the exposure time at the output of the exposure unit 4. After the exposure time, a reset signal (level "I") appears on the output of the exposure unit 4, clearing the counters (at the R inputs) of the unit 6 of the counters at the first input from the zero reference. The control circuit returns to its initial state for the next attempt to enter code.

 With the correct set of code from the last (highest bits) outputs of the counters of block 6 counters, the signals of "filling" are fed through the first output of block 6 counters to the first input of switch 5, from where through the second output they go to the input of block 9 of switching the code depth, where a signal is generated that from the output of block 9 for switching the depth of the code, it enters the input of the executive block 10, which unlocks the locking mechanism for the time specified in the shutter block 4, after which a reset signal appears on the output of the shutter block 4, clearing the account block 6 counters to zero.

 The block diagram of the electronic lock can be performed on any element base.

 The device operates as follows.

 To unlock the user on the block 1 set of code, using two controls, dials a sequence of characters in accordance with the characters of the reference code. When you enter the first character of the code, the signal from the output of block 1 of the code set starts the shutter block 4, which produces a permit for the operation of block 3 of the ban and block 6 of counters. If the sequence of characters is typed in accordance with the characters of the reference code, a resolution is generated in block 6 of the counters, which, through the switch 5 and block 9, switches the code depth to the input of the executive unit 10. The executive unit 10 is turned off and the device returns to its original state after a specified time interval counted by the block 4 excerpts from the moment of dialing the last character of the code.

 In case of violation of the sequence of characters of the dialed code coming from the output of block 1 of the code set through block 2 to eliminate bounce, switch 5 to the second input of block 6 of counters, and the mismatch of the dialed code to the output of block 7 of the set of reference code, a ban is issued that goes to the second input of the block 3 of the ban and locks the block 6 counters on the third input for passing the characters of the code dialed in block 1 until the end of the set of code characters and the exposure time specified by the exposure unit 4. At the same time, the inhibit signal from the output of the prohibition block 3 starts the counter of the number of sets of the false code 8 and writes a unit to it at the counting input. After the time interval determined by the exposure unit 4, the prohibition unit 3 and the counter unit 6 come to the initial state. The electronic lock goes into a state that allows you to redial the code.

 All further erroneous attempts to enter the code are likewise recorded in counter 8 of the number of sets of false code. Upon reaching the set number of erroneous attempts to enter the code, the counter 8 of the number of sets of the false code includes a block 12 for activating the alarm system for the time determined by the delay element 11, after which the counter 8 of the number of sets of the false code returns to its original state.

Claims (3)

 1. ELECTRONIC LOCK, containing a code dialing block, an exposure block, a counter of the number of false code dials, a switch, a reference code block, an executive block, characterized in that the blocks additionally eliminate chatter, prohibition, counters, code depth switching, a delay element , an alarm enable block, and the output of the code dialing block is connected to the first inputs of the chatter elimination block and the prohibition block, the output of the number of false code sets connected to the first inputs of the counter blocks and the counter Rogo through a delay element is connected to the alarm enable block, the input of which is connected to the second input of the counter of the number of false code sets, while the output of the chatter elimination unit through the shutter speed block is connected to the second inputs of the counter block and the inhibit block, the third input of the reference code block connected to the output , the output of the chatter elimination unit is connected to the first input of the switch, the output of which is connected to the third input of the counter block, the output of which is connected to the input of the reference code block, while the switch rvym input coupled to the first output of the block counter and the second output through the block code switching depths - to the execution unit.  2. The lock according to claim 1, characterized in that the switch contains two AND-NOT elements for two inputs, AND elements for three inputs, inverters, while the first inputs of AND elements are the first input of the switch, and the second inputs are three-input and the second two-input elements AND are NOT the second input of the switch and are connected to the inputs of the inverters whose outputs are the second output of the switch, while the output of the first inverter is connected to the second input of the first two-input element AND, the output of which is the first output of the switch and so me to outputs trehvhodovyh and second two-input AND-NO elements, with the following outputs of inverters, but the last of the inverter are connected to the third input trehvhodovyh AND-NOT.  3. The lock according to claim 1, characterized in that the code depth switching unit comprises an inverter, two-input AND-NOT elements, a multi-input AND-NOT element, contact elements, the inverter input, the second inputs of two-input AND-NOT elements being an input of the depth switching unit code, the first inputs of the two-input AND-NOT elements through the contact elements are connected to the zero bus, the outputs of the inverter and the two-input AND-NOT elements to the inputs of the multi-input AND-NOT element, the output of which is the output of the code depth switching block.

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