CN2151592Y

CN2151592Y - Electronic lock for telephone

Info

Publication number: CN2151592Y
Application number: CN 93206946
Authority: CN
Inventors: 郑南平
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-25
Filing date: 1993-03-25
Publication date: 1993-12-29
Anticipated expiration: 2003-03-25

Abstract

The utility model relates to an electronic lock for a telephone, comprising a housing, a keyboard, an indicating lamp, a battery and a circuit board. A keyboard circuit, an on-off control circuit and a polar recognizing and ringing pulse-detecting circuit are designed on the circuit board. The utility model which has the advantages of reliable and sensitive work, high security and low power consumption can be used for effectively preventing that the use of a unit is affected because other people misuse telephones blindly. The utility model can be used for an automatic ticketing telephone electronic to prevent the loss, of telephone fee, which is caused by that other people misuse the telephone. The call time of the lock for the telephone can be controlled at definite time, increasing the efficiency of the speaking time effectively.

Description

Electronic lock for telephone

The utility model relates to the telephone set electronic lock, particularly a kind of telephone set electronic lock with seven positive sign indicating numbers, three pseudo-code keyboards.

In the actual life, the telephone set of unit is often blindly used by the stranger, to the air time can not timing controlled, particularly, abused and can result in greater loss by the people to the telephone set of self-clocking charge.

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, a kind of telephone set electronic lock is provided, could open when making it by the proper password operation keyboard, can block by self-timing during error code, outside line is auto-unlocking and have the luminous indication of ring during off-hook dialing ring initiatively, can also realize timing controlled to the air time.

The purpose of this utility model is achieved in that the utility model is a machine outer type.It includes shell, keyboard, indicator light, battery and circuit board.Circuit board be provided with by switch S B0～SB10, four and or the keyboard circuit that constitutes jointly of door MC4001H1～H8, resistance 1R1～1R9, electric capacity 1C1～1C8, diode 1VD, wherein SBO is the complete machine power circuit; The ON-OFF control circuit that is made of jointly transistor 2VT1～2VT3, diode 2VD2,2VD3, relay KR, resistance 2R1,2R2,2R4, electric capacity 2C1,2C2 is arranged, and 2R3,2VD1 constitute the lock relay indicating light; Have by diode 3VD1～3VD4, resistance 3R1～3R5,3VR, electric capacity 3C1～3C3, diode 3VD5,3VD6,3VD7, light-emitting diode 3VD8, four NAND gate MC4011F1～F4, transistor 3VT1,3VT2 and constitute polarity identification, ringing pulse testing circuit jointly.

In the above-mentioned said keyboard circuit, 1 pin of H1,2 pin link to each other, and lead up to SB1,1R1 to be connected to positive source, and one the tunnel is connected on the anodal point in parallel of 1R2,1C1, and 1R1,1C1 other end ground connection constitute No. 1 digital code.3 pin of H1 are connected to 5 pin, 6 pin, the 1R3 of H2, an end of 1C2 parallel connection by switch S B2, and another termination positive source in parallel constitutes No. 2 digital code.4 pin of H2 link to each other with the anodal end in parallel of 8 pin, 9 pin, 1R4,1C3 of H3 by SB3, and 1R4,1C3 other end ground connection constitute No. 3 digital code.10 pin of H3 are connected to 12 pin, 13 pin, the 1R5 of H4, an end of 1C4 parallel connection by SB4, and 1C4 positive pole, another termination positive source of 1R5 constitute No. 4 digital code.11 pin of H4 link to each other with 1 pin, 2 pin of H5 by SB5, are connected to an end of 1C5 positive pole, 1R6 parallel connection, and 1C5,1R6 other end ground connection constitute No. 5 digital code.One end of 5 pin of 3 pin of H5 by SB6 and H6,6 pin, 1C6,1R7 parallel connection links to each other, and another termination positive source of 1C6 positive pole, 1R7 parallel connection constitutes No. 6 digital code.4 pin of H6 join by a SB7 end in parallel with 8 pin, 9 pin, 1C7 positive pole, the 1R8 of H7, and 1C7,1R8 other end ground connection constitute No. 7 digital code.10 pin of H7 link to each other with 13 pin of H8.12 pin one tunnel of H8 link to each other with 1C8 positive pole, 1R9 parallel connected end, and the other end ground connection of 1C8 negative pole, 1R9 parallel connection leads up to SB8, SB9, SB10 to be connected to positive source, constitutes pseudo-code No. 8, No. 9, No. 10.SB8, SB9, SB10, H8,1C8,1R9 also constitute time-delay keyboard lockout.14 pin of H1～H8 connect positive source, 7 pin ground connection, and 11 pin of H8 link to each other with 1VD is anodal.SB1～SB7(1 number～No. 7 digital codes) be positive key, SB8～SB10(8 number～No. 10 digital codes) be false key.Pseudo-code loads in mixture in positive sign indicating number, to improve confidentiality.

In the above-mentioned said ON-OFF control circuit, the 1VD negative pole links to each other with 2C1 positive pole, 2R1 one end, the 2C1 minus earth, and the 2R1 other end is connected with the 2VT1 base stage, and the 2VT1 collector electrode connects positive source.Emitter is leaded up to 2R2 ground connection, and one the tunnel is connected to the 2VT2 base stage.The 2VT2 collector electrode connects positive source by 2R5, and emitter and 2VT3 base stage are joined.The 2VT3 grounded emitter, collector electrode connects positive source by KR, 2R4.2VD2 is connected anti-parallel to 2VT3 collector electrode and positive source.The 2C2 positive pole is connected on 2R4 and the KR tie point, minus earth.2R3 one termination power positive pole, the other end connect luminous tube 2VD1 positive pole, and the 2VD1 negative pole links to each other with the 2VT3 collector electrode, is serially connected with between outside line and the telephone set after normally open contact KR-1, the KR-2 parallel connection.

In above-mentioned said polarity identification, the ringing pulse testing circuit, diode 3VD1～3VD4 connects into bridge-type, constitutes polarity identification circuit, and its effect is to make the utility model easily with outside line interface, not polarity.And can adapt to appearance " polarity reversing signal " use on the circuit when the equal off-hook of both sides is conversed of some telephone set.Its principle is identical with common bridge rectifier.Connect outside line at this bridge-type two central points, the positive limit of bridge-type is by 3R3 ground connection, and negative pole point connects the end of 3C1 by 3R1, and the other end of 3C1 joins with 3VD5 negative pole, 3VD6 positive pole, 3VD5 plus earth.3VD6 negative pole and 3C2 positive pole join, the 3C2 minus earth.3VR is connected to the 3C2 two ends, and is connected to 1 pin and 2 pin of a F1.3 pin one tunnel of F1 join with 5 pin of door F2, and the 3R5 of leading up to connects the 3VT1 base stage, and the 3VT1 emitter connects 9 volts of positive sources, and the 3VT1 collector electrode connects the 3VT2 base stage, the 3VT2 grounded emitter, and the 3VT2 collector electrode connects 9 volts of positive sources by 3VD8,3R4.6 pin of F2 connect 10 pin of F3, and 4 pin and the 3C3 positive pole of F2 join, and the 3C3 negative pole is leaded up to 3R2 ground connection, and one the tunnel connects 8 pin, 9 pin of F3.10 pin one tunnel of F3 are connected to 6 pin of F2, and one the tunnel connects 12 pin and 13 pin of F4.11 pin of F4 are connected to the joint of 2R1,2C1,1VD by 3VD7.14 pin of F1～F4 connect positive source, 7 pin ground connection.

The utility model is reasonable in design, and work is sensitive reliable, strong security, and standby power dissipation is little.Use it can prevent effectively that other people from blindly abusing telephone set and influence the use of our unit.To the telephone set of automatic charging, can prevent effectively that other people from abusing and loss that the telephone charges that causes is used.Timing controlled can be carried out to the air time, air time efficient can be improved effectively.

Below in conjunction with accompanying drawing and enforcement the utility model is further described.

Fig. 1 is an appearance structure schematic diagram of the present utility model.Among the figure, 1 is shell, and 2 is keyboard, and 3 is mains switch, and 4 is relay indicating light, and 5 are the ring flashing trafficator.

Fig. 2 is circuit theory diagrams of the present utility model.

Shell 1 in the utility model adopts injection mo(u)lding.Key switch in the keyboard 2 adopts standard micro touch-switch or standard small rubber key.Mains switch 3 adopts band self-locking micro press-key formula switch.Relay indicating light 4 is the high brightness green LED.Ring luminous indicating lamp 5 is a High brightness Red LED.

In keyboard circuit, if click the SB1 key, then electric capacity 1C1 is recharged, and 1 pin of H1,2 pin short time are that (because of 1C1 is recharged, resistance 1R2 resistance is bigger for high level, this high level is after the SB1 key is thrown off, short time still keeps, and being convenient to following order button has the reasonable time surplus, and following process is all identical), the H1 upset, 3 pin are low level.Then click the SB2 key, electric capacity 1C2 is recharged, and 5 pin of H2,6 pin short time keep low level, the H2 upset, and 4 pin are high level.Click the SB3 key again, electric capacity 1C3 is recharged, and 8 pin of H3,9 pin short time keep high level, the H3 upset, and 10 pin are low level.Click the SB4 key, electric capacity 1C4 is recharged, and 12 pin of H4,13 pin short time keep low level, the H4 upset, and 11 pin are high level.Click the SB5 key, electric capacity 1C5 is recharged, and 1 pin of H5,2 pin short time are high level, the H5 upset, and 3 pin are low level.Click the SB6 key, electric capacity 1C6 is recharged, and 5 pin of H6,6 pin short time keep low level, the H6 upset, and 4 pin are high level.Click the SB7 key, electric capacity 1C7 is recharged, and 8 pin of H7,9 pin short time keep high level, the H7 upset, and 10 pin are low level, this low level is sent into 13 pin of H8, the H8 upset, 11 pin are high level.This high level is sent into ON-OFF control circuit through 1VD, finishes and unblanks.

In the button process, if wrong any key of pressing in three pseudo-keys of SB8～SB10, high level will appear in 12 pin of H8, and to electric capacity 1C8 charging, because of the 1R9 resistance is bigger, SB8～SB10 key be thrown off, and this high level still kept in the regular hour.H8 upset this moment, 11 pin then become low level, and keyboard is in blocked styate.Both made the state that also can not change H8 according to proper password order operation keyboard again.After must waiting for the regular hour, button again.The utility model keyboard lockout time set is 15 seconds, depends on the value of 1C8,1R9.

In ON-OFF control circuit, when 11 pin of H8 are high level (keyboard input password is correct), because the effect of 3VD7, this high level does not enter 11 pin of F4, directly is input to the 2VT1 base stage through 1VD, and simultaneously electric capacity 2C1 is charged.The 2VT1 conducting, 2VT2,2VT3 get bias voltage conducting in succession.Because to charge by 2R4, when the 2VT3 conducting, 2C2's 2C2 does not over the ground discharge by KR coil, 2VT3 collector electrode rapidly before 2VT3 has conducting, the KR coil flows through bigger discharging current, and KR is adhesive immediately, and by keeping adhesive after the 2R4 current limliting.Can reduce power consumption effectively.Its contact KR-1, KR-2 connect telephone set and outside line, and this moment, normally telephone set was used in the off-hook dialing.Because the high level of H8 output charges to 2C1 at certain hour, when the high level of H8 output disappeared, 2C1 discharged over the ground by 2R1,2VT1 base stage, emitter, 2R2, keeps the 2VT1 conducting, realized the timing controlled to the air time.When the 2C1 discharge level was lower than the 2VT1 conduction level, KR discharged, and its break of contact telephone set is connected with outside line, and the utility model is in stand-by state, and timing is chosen at can satisfy general conversation requirement between 5～8 minutes.Occurrence can obtain by the value of adjusting 2C1,2R1,2R2.Under the individual cases,, can repeat to obtain time-delay by the proper password operation keyboard as disliking the air time not enough.

In polarity identification, ringing pulse testing circuit, when outside line the other side off-hook dials, a series of ringing pulse by polarity identification after 3R1,3C1 and by 3VD5, the detection rectification of 3VD6 multiplication of voltage after 3C2 filtering, 1 pin, 2 pin that have the dc pulse signal of certain peak value to F1 of 3VR amplitude adjustment output.F1 upset this moment, 3 pin output low levels, this level is leaded up to 3R5 and is inputed to the 3VT1 base stage, makes the 3VT1 conducting, and 3VT2 is conducting also, and light-emitting diode 3VD8 is along with ringing tone is luminous flickeringly.One the tunnel is input to 5 pin of the bistable trigger of being made up of F2, F3, F2 upset, and 4 pin are high level and 3C3 are charged.Because the 3R2 resistance is bigger, starting stage, this high level was added in the 3R2 two ends, the 3C3 negative terminal is high level (3C3,3R2 be provided with the effect be behind the ringing pulse blackout, still make and keep high level in F3 input, F4 output short time, to prolong charging interval to 2C1), its time expand, determine that by the value of 3C3,3R2 the utility model was designed to for 10 seconds.Because the 3C3 negative terminal is a high level, 8 pin of F3,9 pin also are the upset of high level door, and 10 pin are low level, and 6 pin of F2 also are low level.Because the effect of F2, F3 bistable, 12 pin of F4,13 pin keep low level, door upset 11 pin output high level, and because of the effect of 1VD, this level does not enter 11 pin of H8, directly is input to the 2VT1 base stage through 3VD7,2R1, and 2C1 is charged.2VT1,2VT2,2VT3 conducting in succession, the KR adhesive, its contact KR-1, KR-2 connect telephone set, and send ringing tone, can be talked about by off-hook by words.After ringing pulse disappears, door F1～F2 upset.Because the effect of 3C3,3R2,8 pin of F3,9 pin still keep high level (10～15 seconds) at short notice, and 11 pin of F4 also keep high level, keep the charging to 2C1.Along with 3C3 discharges over the ground by 3R2, when being discharged to when being lower than the F3 incoming level, the F3 upset, F4 overturns thereupon, and 11 pin become low level, stop the charging to 2C1.This moment, 2C1 discharged over the ground by 2R1,2R2,2VT1 base stage, emitter, kept the 2VT1 conducting.This keeps the timing controlled time that the 2VT1 ON time is the off-hook conversation.The 2C1 discharge off, 2VT1,2VT2,2VT3 end, and KR discharges, and its break of contact telephone set is connected with outside line, and the utility model is in stand-by state.

The utility model will have a dial impulse to be input to the ringing pulse testing circuit by polarity identification circuit, and make the gate circuit upset unblanking the back initiatively in the process of off-hook dialing, and the high level of F4 output is through the 3VD7 2C1 two ends that are added to.This moment, 2C1 can only have two states: charged state or discharge condition, if 2C1 is in discharge condition, the stack high level will be to the 2C1 recharge, and if 2C1 is in charged state, the high level of stack can be not that process produces harmful effect to filling of 2C1.

Because the audio signal of telephone set both sides when conversing is very little, can not trigger the ringing pulse testing circuit, so can not cause the utility model current drawn from the telephone wire.Because of the effect of polarity identification circuit can not be reflected to the utility model circuit signal on the telephone wire yet.This point is very important, otherwise will lose the due use value of the utility model.

Claims

1, a kind of telephone set electronic lock, include shell, keyboard, indicator light, battery and circuit board, it is characterized in that: circuit board be provided with by switch S BO～SB10, four and or the keyboard circuit that constitutes jointly of door MC4001H1～H8, resistance 1R1～1R9, electric capacity 1C1～1C8, diode 1VD; The ON-OFF control circuit that is made of jointly transistor 2VT1～2VT3, diode 2VD2,2VD3, relay KR, resistance 2R1,2R2,2R4, electric capacity 2C1,2C2 is arranged; Diode 3VD1～3VD4, resistance 3R1～3R5,3VR, electric capacity 3C1～3C3, diode 3VD5,3VD6,3VD7, light-emitting diode 3VD8 are arranged, and four NAND gate MC4011F1～F4, transistor 3VT1,3VT2 constitute polarity identification, ringing pulse testing circuit jointly.

2, telephone set electronic lock according to claim 1 is characterized in that: in the above-mentioned said keyboard circuit, 1 pin of H1,2 pin link to each other, and lead up to SB1,1R1 to be connected to positive source.One the tunnel is connected on the parallel connection point of 1R2,1C1 positive pole, and the other end ground connection of 1R2,1C1 constitutes No. 1 digital code; 3 pin of H1 are connected to 5 pin, 6 pin, the 1R3 of H2, an end of IC2 parallel connection by switch S B2, and another termination positive source in parallel constitutes No. 2 digital code; 4 pin of H2 link to each other with the anodal end in parallel of 8 pin, 9 pin, 1R4,1C3 of H3 by SB3, and 1R4,1C3 other end ground connection constitute No. 3 digital code; 10 pin of H3 are connected to 12 pin, 13 pin, the 1R5 of H4, an end of 1C4 parallel connection by SB4, and 1C4 positive pole, another termination positive source of 1R5 constitute No. 4 digital code; 11 pin of H4 link to each other with 1 pin, 2 pin of H5 by SB5, are connected to the positive pole end in parallel with 1R6 of 1C5, and 1C5,1R6 other end ground connection constitute No. 5 digital code; One end of 5 pin of 3 pin of H5 by SB6 and H6,6 pin, 1C6,1R7 parallel connection links to each other, and another termination positive source of 1C6 positive pole, 1R7 parallel connection constitutes No. 6 digital code; 4 pin of H6 join by a SB7 end in parallel with 8 pin, 9 pin, 1C7 positive pole, the 1R8 of H7, and 1C7,1R8 other end ground connection constitute No. 7 digital code; 10 pin of H7 link to each other with 13 pin of H8, and 12 pin one tunnel of H8 link to each other with 1C8 positive pole, 1R9 parallel connected end, and the other end ground connection of 1C8 negative pole, 1R9 parallel connection leads up to SB8, SB9, SB10 to be connected to positive source, constitutes No. 8,9,10, pseudo-code; SB8, SB9, SB10, H8,1C8,1R9 also constitute time-delay keyboard lockout; 14 pin of H1～H8 connect positive source, 7 pin ground connection, and 11 pin of H8 link to each other with 1VD is anodal.

3, telephone set electronic lock according to claim 1, it is characterized in that: in the above-mentioned said ON-OFF control circuit, 1VD negative pole and 2C1 positive pole, 2R1 one end links to each other, the 2C1 minus earth, the 2R1 other end is connected with the 2VT1 base stage, the 2VT1 collector electrode connects positive source, emitter is leaded up to 2R2 ground connection, and one the tunnel is connected to the 2VT2 base stage, and the 2VT2 collector electrode connects positive source by 2R5, emitter and 2VT3 base stage are joined, the 2VT3 grounded emitter, collector electrode passes through KR, 2R4 connects positive source, and 2VD2 oppositely is connected to 2VT3 collector electrode and positive source, the 2C2 positive pole is connected on 2R4 and the KR tie point, minus earth; 2R3 one termination power positive pole, the other end connect luminous tube 2VD1 positive pole, and the 2VD1 negative pole links to each other with the 2VT3 collector electrode, is serially connected with between outside line and the telephone set after normally open contact KR-1, the KR-2 parallel connection.

4, telephone set electronic lock according to claim 1, it is characterized in that: in above-mentioned said polarity identification, the ringing pulse testing circuit, 3VD1～3VD4 connects into bridge-type, bridge-type two central points connect outside line, the positive limit of bridge-type is by 3R3 ground connection, negative pole point connects the end of 3C1 by 3R1, and the other end of 3C1 joins with 3VD5 negative pole, 3VD6 positive pole, 3VD5 plus earth; 3VD6 negative pole and 3C2 positive pole join, the 3C2 minus earth; 3VR is parallel to the 3C2 two ends, and is connected to 1 pin, 2 pin of a F1; 3 pin one tunnel of F1 join with 5 pin of door F2, and the 3R5 of leading up to connects the 3VT1 base stage, and the 3VT1 emitter connects 9 volts of positive sources, and the 3VT1 collector electrode connects the 3VT2 base stage, the 3VT2 grounded emitter, and the 3VT2 collector electrode connects 9 volts of positive sources by 3VD8,3R4; 6 pin of F2 connect 10 pin of F3, and 4 pin and the 3C3 positive pole of F2 join; The 3C3 negative pole is leaded up to 3R2 ground connection, and one the tunnel connects 8 pin, 9 pin of F3; 10 pin one tunnel of F3 are connected to 6 pin of F2, and one the tunnel connects 12 pin, 13 pin of F4; 11 pin of F4 are connected to the joint of 2R1,2C1,1VD by 3VD7; 14 pin of F1～F4 connect positive source, 7 pin ground connection.