CN2485892Y

CN2485892Y - Anti-stealing telephone with micro-computer

Info

Publication number: CN2485892Y
Application number: CN 01240255
Authority: CN
Inventors: 马广乐
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-04
Filing date: 2001-06-04
Publication date: 2002-04-10
Anticipated expiration: 2011-06-04

Abstract

The utility model relates to a telephone antitheft device with a micro computer. The utility model is mainly composed of a programmable microcircuit chip U1, and a dual audio frequency number receiving chip U4, a memory chip U2 and a signal emitting chip U3 which are connected with the chip U1. The antitheft device is provided with an external line interface and a telephone interface. The telephone interface is respectively connected with the external line interface and a signal receiving pipe pin of a chip U4 through a normally open contact and a normally closed contact of a switching relay JD2. The output of a ringing sensing circuit is connected with a ringing signal input pin of the programmable micro computer chip U1. A dual audio frequency dialing circuit which is mainly composed of the emitting signal U3 is connected with the external line interface through a bridge rectifying circuit.

Description

Microcomputer phone alarm

The utility model relates to a kind of device that prevents free call on somebody else's expense through illegal means of electricity field, relates in particular to a kind of microcomputer phone alarm.

At present, the telephone anti-theft device of being produced on the market miscellaneous, when outside line had the phone start, self sent a kind of forte to circuit and disturbs frequently, makes free call on somebody else's expense through illegal means person hear ear-piercing cry, and telephone set also sends alarm sound simultaneously.But, if free call on somebody else's expense through illegal means person cut off the circuit that leads to the user, connecting the telephone set of oneself before start, others' phone of free call on sb. else's expense through illegal means of just can feeling at ease behind the talk-through, recovers former state to user's circuit again.Can accomplish unknown to god or ghostly, can not play real anti-free call on sb. else's expense through illegal means.Simultaneously, this pseudo-anti-theft device also hinders carrying out of other telecommunication service.In addition, telecommunication department is also being perplexed in the telephone expenses dispute that free call on sb. else's expense through illegal means produced always, complains to remain high, and the lawsuit of Chan Shenging also takes place again and again for this reason.

In light of this situation, telecommunication department has been released a kind of new business-" electronic password lock " specially, and this is that a kind of inside implementation from switch locks, and the circuit from switch is gone out all locks.As long as do not know password, anyone can not free call on somebody else's expense through illegal means.This business is: the user arrives first the pre-first to file in the telecommunication business Room, default four any passwords, and after the service fulfillment, the user carries out sequence of operations on telephone set, just can add the phone of oneself and lock.If do not carry out unlock operation, be exactly that oneself can not normal talking.Want to make a phone call, must carry out unlock operation.After having made a call, also to operate, lock, if not, " electronic password lock " any antitheft effect of can not performing practically no function.

At above-mentioned condition, the purpose of this utility model is to provide a kind of microcomputer phone alarm, to realize automatic unlocking and to lock.

For achieving the above object, the technical solution of the utility model is to have adopted a kind of microcomputer phone alarm, this alarm is by D.C. regulated power supply, microcircuit chip U1 able to programme, and the double-tone that is connected with programmable microcomputer chip U1 frequency number receiving chip U4, memory chip U2, sending chip U3 is main formation, alarm is provided with outer line interface and telephony interface, telephony interface links to each other with the pin that collects the digits of outer line interface with double-tone frequency number receiving chip respectively with normally closed contact K2 by the normal opened contact of a switching relay JD2, be equipped with in the wiring of telephony interface and carry the machine sensing circuit, the output of carrying the machine sensing circuit inserts the sign on input pin of programmable microcomputer chip U1, be connected with the ring sensing circuit outside on the line interface, the output of ring sensing circuit is connected into the bell signal input pin of programmable microcomputer chip U1, the conversion instruction pin of programmable microcomputer chip links to each other with switching relay JD2 solenoid, serves as that the main dual-tone dialing circuit of forming is by a bridge rectifier D8 with above-mentioned sending chip U3, D9, D10, D11 links to each other with outer line interface.

Described normally closed contact K1 by switching relay JD2 and double-tone number are frequently accepted the series circuit that circuit inter-burst that the pin that collects the digits of chip links to each other is associated with capacitor C 9, resistance R 6, R7 composition.

The described machine sensing circuit of carrying is made up of sensing resistor R20 and two optocoupler P2, P3, resistance R 20 is serially connected on the single line road of telephony interface, the input of two optocouplers is connected the two ends of resistance R 20 in opposite mode, exports and connect the sign on input that programmable microcomputer chip U1 is inserted in the back.

Described ring sensing circuit is made up of a bridge rectifier D15, D16, D18, D19 and an optocoupler P1, the ac input end of this bridge rectifier is connected on the outer line interface by coupling capacitance C15, the direct current output of this bridge rectifier is connected the input of optocoupler P1 by resistance R 19, be connected to filter capacitor C14 in the direct current output of bridge rectifier, the output of optocoupler P1 inserts the bell signal input pin of programmable microcomputer chip U1.

Number pin of sending out of sending chip U3 links to each other with the base stage of a triode Q1 by resistance R 14 in the described dual-tone dialing circuit, triode Q1 is by two series resistance R15, R16 ground connection, the collector electrode of triode Q1 links to each other with the positive pole of bridge rectifier D8-D11, and link to each other with ground by resistance R 13, be parallel with capacitor C 13 on the earth resistance R16.

Bridge rectifier D8, the D9 that described dual-tone dialing circuit connects, the ac input end of D10, D11 link to each other with outer line interface by the normally opened contact K1 of switching relay JD1, and the solenoid of switching relay JD1 links to each other with the release control pin of programmable microcomputer chip U1.

Described programmable microcomputer chip U1 is the 89c2051 type, and described memory chip U2 is the 24C16 type, and described double-tone number receiving chip U4 frequently is 8870 types, and described sending chip U3 is the 9200A type, and described optocoupler P1, P2, P3 are the PC817 type.

The resetting pin " 1 " of described programmable microcomputer chip U1 links to each other with positive source by capacitor C 6, links to each other with ground by resistance R 2.

Because the utility model serves as main formation with the programmable microcomputer chip, be connected with double-tone number receiving chip, memory chip, sending chip frequently on the computer chip, thereby people can send into double-tone number receiving chip frequently to unlocking pin by phone in advance, by sending into the programmable microcomputer chip after the double-tone number receiving chip decoding frequently, deposit in the memory chip again by the programmable microcomputer chip.When the user mentions phone, the machine sensing circuit of carrying is just given commencing signal of programmable microcomputer chip, the programmable microcomputer chip just takes out unlocking pin in the memory chip and is sent to outside line automatically by the dual-tone dialing circuit, make switch release in very short time of telecommunication bureau, then just outside number dialing telephone call of user.This process and make a phone call to operate without the slightest difference has usually but been finished unlocking operation unconsciously, and is simple and practical, reliably antitheft.Owing to be connected with ring institute inductive circuit in the outside line, thereby when the incoming call bell signal, the ring sensing circuit is passed to signal of programmable microcomputer chip, instruction takes place microcomputer computer chip able to programme immediately makes incoming call directly be transferred on the telephone set, make the phone ring, incoming call answering easily, in addition, the utility model Programmable Logic Controller can send the dialing tone of 450HZ automatically before release, simultaneously dialing is temporarily stored into memory chip, moment is sent to outside line after treating release, has the dial memory function, after the conversation, Programmable Logic Controller also can automatically lock by dial-up circuit automatically, is easy to use freely.As can be seen, the function that the utility model can be finished release well, lock has reliable preventing telephone from dialing without admission function, and for making things convenient for people's lives, the protection user benefit provides good methods, and application promise in clinical practice is arranged.

The utility model is further explained and explanation below in conjunction with accompanying drawing:

Fig. 1 is circuit theory diagrams of the present utility model.

As shown in Figure 1, microcomputer phone alarm of the present utility model, by D.C. regulated power supply, 89c2051 type microcircuit chip U1 able to programme, and the 24C16 type memory chip U2 that is connected with programmable microcomputer chip U1,9200A type sending chip U3,8870 type double-tones number receiving chip U4 frequently are main formation, alarm is provided with outer line interface WX1-in, WX2-in and telephony interface HJ1-out, HJ2-out, telephony interface HJ1-out, HJ2-out by a switching relay JD2 normal opened contact and normally closed contact K2 respectively with outer line interface WX1-in, WX2-in links to each other with the pin that collects the digits " 3 " of double-tone frequency number receiving chip U4, be equipped with in the wiring of telephony interface and carry the machine sensing circuit, the output of carrying the machine sensing circuit inserts the sign on input pin " 12 " of programmable microcomputer chip U1, be connected with the ring sensing circuit outside on the line interface, the output of ring sensing circuit is connected into the bell signal input pin " 13 " of programmable microcomputer chip U1, the conversion instruction pin " 14 " of programmable microcomputer chip links to each other with switching relay JD2 solenoid, serves as that the main dual-tone dialing circuit of forming is by a bridge rectifier D8 with above-mentioned sending chip U3, D9, D10, D11 links to each other with outer line interface.Normally closed contact K1 by switching relay JD2 and double-tone number are frequently accepted the series circuit that circuit inter-burst that the pin that collects the digits " 3 " of chip U4 links to each other is associated with capacitor C 9, resistance R 6, R7 composition.Carrying the machine sensing circuit is made up of sensing resistor R20 and two PC817 type optocoupler P2, P3, resistance R 20 is serially connected on the single line road of telephony interface, the input of two optocouplers is connected the two ends of resistance R 20 in opposite mode, exports and connect the sign on input " 12 " that programmable microcomputer chip U1 is inserted in the back.The ring sensing circuit is made up of a bridge rectifier D15, D16, D18, D19 and a PC817 type optocoupler P1, the ac input end of this bridge rectifier is connected WX1-in, WX2-in on the outer line interface by coupling capacitance C15, the direct current output of this bridge rectifier is connected the input of optocoupler P1 by resistance R 19, be connected to filter capacitor C14 in the direct current output of bridge rectifier, the output of optocoupler P1 inserts the bell signal input pin " 13 " of programmable microcomputer chip U1.Number pin " 7 " of sending out of sending chip U3 links to each other with the base stage of a triode Q1 by resistance R 14 in the dual-tone dialing circuit, triode Q1 is by two series resistance R15, R16 ground connection, the collector electrode of triode Q1 links to each other with the positive pole of bridge rectifier D8-D11, and link to each other with ground by resistance R 13, be parallel with capacitor C 13 on the earth resistance R16.Bridge rectifier D8, the D9 that is connected with the dual-tone dialing circuit, the ac input end of D10, D11 link to each other with outer line interface WX1-in, WX2-in by the normally opened contact K1 of switching relay JD1, and the solenoid of switching relay JD1 links to each other with the release control pin " 9 " of programmable microcomputer chip U1.The resetting pin " 1 " of programmable microcomputer chip U1 links to each other with positive source by capacitor C 6, links to each other with ground by resistance R 2.

During use, after the input of 220 volts of alternating currents, be transformed into 26 volts of alternating currents to 220 volts, behind D2, D3, D4, D5, C1 rectifying and wave-filtering, become a direct current through isolating transformer T, again by 7824 voltage stabilizings soon surely to 24 volts again through C8 filtering, by R4, R5 to circuit supply.After the step-down of R4 current limliting, again through voltage stabilizing fast 7805 voltage surely extremely+5 volts to power supplies such as U1, U2, C7 is a filter capacitor, R17, D12 are power indicating circuit.

After powering on, the reset circuit of forming by C6, R2 resets U1, and U2, U3, U4 also reset and await orders simultaneously.

When outwards dialling, mention microphone, step-down makes P2, the conducting of P3 optocoupler on the resistance R 20, and the 12 pin current potentials of programmable microcomputer chip U1 become 0 by 1 saltus step, and program brings into operation, make 11 pin send the 450HZ dialing tone, simultaneously, 9 pin of U1 become 0 by high potential 1 saltus step, make the JD1 adhesive, the K1 state changes, and+5V electricity makes light-emitting diode D13 luminous (expression enters released state) by resistance R 18.This moment, programmable microcomputer chip U1 read the unlocking pin that pre-deposits by 2,3 pin in memory U2, the dual-tone dialing circuit of forming with 7,8,9 foot control system sending chip 9200A, triode Q1, resistance R 14, R15, R16, R13, capacitor C 13 is sent to outer line interface again, makes the switch release of telecommunication bureau.Simultaneously, the user is again in the dialing that does not stop, and the new number of dialling enters digit receiver U4 by C9, R7, R6, sends into programmable microcomputer chip U1 through U4 decoding, deposits U2 in by U1 again.After the U1 release finished, the number that the new number of dialling of user is deposited in U2 was read and is mail to circuit again.Distribute complete back 14 pin adhesive JD2 by U1 the K2 state is changed, substation leads directly to outside line, and the number that the user dials is later on more directly received by telecommunication bureau's switch.More than wholely finish to subscriber dialing from off-hook, this machine has just finished also that being locked into newly dials the number the user is sent to all processes of outside line from separating, and at most just about 3 seconds, has accomplished the user basically unconsciously.After having communicated on-hook, U1 can be provided with and wait for 6 seconds.If the user makes a phone call continuously within 6 seconds, U1 not lock again, release, the user can directly converse, after 6 seconds, if do not converse, U1 controls U3 and Q1 automatically and sends to outside line and add lock cipher, makes the outside line locking.When calling, P1 is an incoming call ring detecting element.As when incoming call, rectification, filtering that C15, D15, D16, D18, D19, C14, R19 form, current-limiting circuit makes the P1 conducting, P1, P4 pin current potential are 0 by 1 saltus step, trigger 13 pin of U1, make U1 send one order, make the 14 pin current potentials of U1 become 0 by 1 saltus step, phone circuit is connected in the JD2 adhesive, is that phone ring, phone are proposed the machine conversation, make P2, P3 conducting, 12 pin of U1 are triggered, and the adhesive of JD2 can not disconnected, till user's on-hook.

Not release of U1 does not lock yet during incoming call.

Claims

1, a kind of microcomputer phone alarm, it is characterized in that this alarm is by D.C. regulated power supply, microcircuit chip U1 able to programme, and the double-tone that is connected with programmable microcomputer chip U1 frequency number receiving chip U4, memory chip U2, sending chip U3 is main formation, alarm is provided with outer line interface and telephony interface, telephony interface links to each other with the pin that collects the digits of outer line interface with double-tone frequency number receiving chip respectively with normally closed contact K2 by the normal opened contact of a switching relay JD2, be equipped with in the wiring of telephony interface and carry the machine sensing circuit, the output of carrying the machine sensing circuit inserts the sign on input pin of programmable microcomputer chip U1, be connected with the ring sensing circuit outside on the line interface, the output of ring sensing circuit is connected into the bell signal input pin of programmable microcomputer chip U1, the conversion instruction pin of programmable microcomputer chip links to each other with switching relay JD2 solenoid, serves as that the main dual-tone dialing circuit of forming is by a bridge rectifier D8 with above-mentioned sending chip U3, D9, D10, D11 links to each other with outer line interface.

2, Device for anti-fraudulent use telephone line according to claim 1, it is characterized in that described normally closed contact K1 by switching relay JD2 and double-tone frequently number accept the series circuit that circuit inter-burst that the pin that collects the digits of chip links to each other is associated with capacitor C 9, resistance R 6, R7 composition.

3, Device for anti-fraudulent use telephone line according to claim 2, it is characterized in that the described machine sensing circuit of carrying is made up of sensing resistor R20 and two optocoupler P2, P3, resistance R 20 is serially connected on the single line road of telephony interface, the input of two optocouplers is connected the two ends of resistance R 20 in opposite mode, exports and connect the sign on input that programmable microcomputer chip U1 is inserted in the back.

4, Device for anti-fraudulent use telephone line according to claim 3, it is characterized in that described ring sensing circuit is made up of a bridge rectifier D15, D16, D18, D19 and an optocoupler P1, the ac input end of this bridge rectifier is connected on the outer line interface by coupling capacitance C15, the direct current output of this bridge rectifier is connected the input of optocoupler P1 by resistance R 19, be connected to filter capacitor C14 in the direct current output of bridge rectifier, the output of optocoupler P1 inserts the bell signal input pin of programmable microcomputer chip U1.

5, Device for anti-fraudulent use telephone line according to claim 4, it is characterized in that number pin of sending out of sending chip U3 links to each other with the base stage of a triode Q1 by resistance R 14 in the described dual-tone dialing circuit, triode Q1 is by two series resistance R15, R16 ground connection, the collector electrode of triode Q1 links to each other with the positive pole of bridge rectifier D8-D11, and link to each other with ground by resistance R 13, be parallel with capacitor C 13 on the earth resistance R16.

6, Device for anti-fraudulent use telephone line according to claim 5, the ac input end that it is characterized in that bridge rectifier D8, D9 that described dual-tone dialing circuit connects, D10, D11 links to each other with outer line interface by the normally opened contact K1 of switching relay JD1, and the solenoid of switching relay JD1 is controlled pin with the release of programmable microcomputer chip U1 and linked to each other.

7, according to arbitrary described Device for anti-fraudulent use telephone line of claim 1-5, it is characterized in that described programmable microcomputer chip U1 is the 89c2051 type, described memory chip U2 is the 24C16 type, described double-tone number receiving chip U4 frequently is 8870 types, described sending chip U3 is the 9200A type, and described optocoupler P1, P2, P3 are the PC817 type.

8, Device for anti-fraudulent use telephone line according to claim 7 is characterized in that the resetting pin " 1 " of described programmable microcomputer chip U1 links to each other with positive source by capacitor C 6, links to each other with ground by resistance R 2.