CN2242550Y - Device for preventing fraudulent use of telephone - Google Patents

Abstract

The utility model discloses a device for preventing fraudulent use of telephone, belonging to a novel protective device for preventing the fraudulent use of the telephone, which can prevent the fraudulent use and the tapping of the telephone. The device for preventing fraudulent use of telephone is composed of an electronic cross circuit, an antitheft testing circuit, an in-house testing circuit, an impulse amplifying circuit, a hang-up prevention circuit, an audible and visual alarm circuit, an automatic detective circuit, an extension telephone interlock circuit and an interconnecting link thereof. The device for preventing fraudulent use of telephone has the advantages of simple structure, novel design, complete function, operational safety, low cost, etc. Adopting the device for preventing fraudulent use of telephone can make the secretly jointed single machine of the distance control telephone to lose the working ability due to the loss of voltage. The utility model is a device for preventing fraudulent use of telephone which is suitable for the anti-theft of the distance control telephone line of the subscriber.

Description

The phone anti-theft protector

Phone anti-theft protector described in the utility model belongs to a kind of novel phone theft-preventing protecting device that prevents the machine of answering the call steathily and eavesdropping.

At present, in the technical field of phone anti-theft protection, alarm belongs to interference type mostly, and this series products does not fundamentally solve the antitheft problem of telephone line.Its reason is that the operating voltage of existing alarm itself is higher, is generally about 12V, does not influence appropriator telephone set operate as normal; Secondly prior art applies interference signal to circuit, just influences the speech quality of appropriator, does not influence its dialing and conversation, so make the user suffer the loss of telephone charges equally.At the shortcoming of above-mentioned prior art, it is very necessary developing a kind of novel phone theft-preventing protecting device.

In view of existing problem in the above-mentioned prior art, the purpose of this utility model is a kind of novel phone theft-preventing protecting device that can fundamentally solve the antitheft problem of phone of design.In the utility model, utilize the way of electronic device equivalence swinging cross, reduce line voltage distribution about 3.5V, make the program controlled telephone unit, promptly can't hear the sound of dialing, also pull out and do not go out number because of the brownout ability of losing the job; So fundamentally solved the problem of appropriator parallel operation phreaking on the line, and the utility model utilizes this low-voltage, but operate as normal still.The utlity model has characteristics such as simple in structure, novel in design, multiple functional, that use is reliable, with low cost; It is a kind of novel phone anti-theft protector that is applicable to that the program controlled telephone circuit is antitheft.

The utility model provides a kind of phone anti-theft protector; Its structure by electronics swinging cross circuit, antitheft testing circuit, personal testing circuit, promote amplifying circuit, mistake proofing circuit, audible and visual alarm circuit, patrol and visit circuit, extension set interlock circuit and connection line thereof and formed automatically.Diode D1, the D2 of electronics swinging cross circuit is connected with integrated circuit block IC in L2 and the audible and visual alarm circuit with telephone wire L1 respectively with triode V4.The optocoupler V5 that promotes in the amplifying circuit is connected with triode V1 in the antitheft testing circuit with integrated circuit block IC respectively.The extension set interlock circuit is made up of bidirectional triode thyristor V6, V7 bidirectional trigger diode D7, D8 and capacitor C 4, C5, connects in the wiring at one end to connect.Electronics swinging cross circuit described in the utility model is made up of diode D1, D2, triode V4 and connection line thereof.Antitheft testing circuit is made up of resistance R 2, R3, R4, triode V1 and connection line thereof.Personal testing circuit described in the utility model is made up of diode D3, D5, resistance R 5, triode V1 and connection line thereof.Promotion amplifying circuit described in the utility model is made up of resistance R 2, triode V1, V2, V3, optocoupler V5 and connection line thereof.Audible and visual alarm circuit described in the utility model is made up of application-specific integrated circuit (ASIC) piece IC, resistance R 6, capacitor C 2 and connection line thereof; The IC model is CD4069.Automatic routing inspection circuit described in the utility model is made up of optocoupler V5 application-specific integrated circuit (ASIC) piece IC and connection line thereof.Extension set interlock circuit described in the utility model is made up of bidirectional triode thyristor V6, V7 bidirectional trigger diode D7, D8 capacitor C 4, C5 and connection line thereof.

The utility model is a kind of novel phone theft-preventing protecting device that guarantees program controlled telephone user's circuit not stolen answer the call machine and eavesdropping.The utility model has fundamentally solved the problem of appropriator parallel operation phreaking and tap phone by the way of electronic devices and components swinging cross.The utility model makes the appropriator at all can't operate as normal, and finally stops to usurp action.Because the utility model has been protected telephone subscriber's phone-specific power effectively, and appropriator can't be succeeded, for the telephone subscriber from all having given protection mentally, economically.The utlity model has characteristics such as simple in structure, that use is reliable, convenience is suitable, with low cost.Therefore will provide a kind of novel phone theft-preventing protecting device for China's telephonic communication.Extensive use of the present utility model will have positive social benefit and remarkable economic efficiency.

The utility model has three accompanying drawings, and wherein: accompanying drawing 1 is the winding diagram of phone anti-theft protector.Accompanying drawing 2 is circuit theory diagrams of phone anti-theft protector.Accompanying drawing 3 is to patrol the oscillating impulse waveform figure that visits circuit automatically.

Specific embodiment of the utility model as shown in drawings; DH1, DH2 are two telephone sets in accompanying drawing 1, and DFBQ is the phone anti-theft protector, L1, L2, are telephone wire.Phone anti-theft protector DFBQ is installed in its arrival end connection L1 and L2 between telephone wire and the telephone set, and its port of export L1, L2 wiring and L1, L3 wiring respectively meet telephone set DH1, a DH2 respectively.Accompanying drawing 2 is circuit theory diagrams of phone anti-theft protector, and totally eight parts are formed; Wherein: 1, electronics swinging cross circuit; be made up of D1, D2, V4, it is the core that shields, and electric current is finished the loop by L1 → D1 → D2 → V4 → L2 when the V4 conducting; make that voltage only has 3.5V between L1, the L2, make appropriator outside the telephone set of line parallel can't work.2, antitheft testing circuit is made up of R2, R3, R4, V1.This circuit valve threshold voltage is 17V, and when circuit voltage was higher than 17V, the V1 conducting was in low resistance state, and when circuit voltage was lower than 17V, V1 was by being in high-impedance state.3, personal testing circuit is made up of D3, D5, R5, V1.When own off-hook, electric current is by light-emitting diode D5 (green light is bright), the about 2.2V of its pressure drop, and the guiding by D3 makes the V1 conducting be low resistance state through R5.4, promote amplifying circuit, be made up of the triode portion of R2, V2, V3, V1 and V5, V1 is the following inclined to one side value resistance of V2, when the triode portion of V1 or V5 when being high-impedance state, V2 obtains base current by R2, the utmost point connection by V2, V3 amplifies, promote V4, make the V4 conducting.5, mistake proofing circuit by R1, C1, is formed, and prevents to disturb the error protection that causes, R1 connects with V1 in addition and D2, V4 between the balance of voltage; D4 is in parallel with D5, makes ringing-current that one smooth path be arranged.6, the audible and visual alarm circuit wherein sound alarm part forms multi-harmonic-oscillations by IC1, IC2, R6, the C2 of application-specific integrated circuit (ASIC) piece IC (model 4069), through the IC3 promotion, be added on the Y1 piezoelectric ceramic piece and send the sound.Light alarm part is taken on by light-emitting diode D2, and the D2 lamp is bright when the V4 conducting.7, patrol the spy circuit automatically, form by circuit such as optocoupler V5 and IC3, IC4, IC5; Form to patrol by IC3, IC4, R7, R8, D6, C3 and visit impulse hunting (as shown in Figure 3), between t1 → t2, the diode section of V5 has electric current to pass through, the triode portion conducting of V5 is in low resistance state, the diode section no current of V5 between t2 → t3, triode portion is by being high-impedance state.8, extension set interlock circuit is formed two extension set interlock circuits by D7, V6, C4 and D8, V7, C5, and first off-hook person promptly blocks another extension set behind off-hook, and the speech of two machines be can't hear mutually; Wherein C4, C5 are anti-pulse dialing mistake.Concrete operation principle of the present utility model is, normally do not take place when stolen when outside line is in, and line scan pickup coil side voltage is 48V, and greater than the threshold voltage of antitheft testing circuit, the V1 conducting is a low resistance state, and V2, V3 all end.Meet sb. at the airport when usurping circuit when outside line, the appropriator off-hook drops to about 12V L1, L2 two terminal voltages, is lower than the threshold voltage of outer testing circuit, V1 ends, and is high-impedance state, and V2 obtains base flow by R2, amplify through V3, promote the V4 conducting, electronics swinging cross circuit working makes L1, L2 terminal voltage drop to 3.5V, this moment, D2 was luminous, IC utilizes the work of the pressure drop of D2: 1, IC1, IC2 vibration promotes through IC3, and Y1 sends sound equipment, and the realization acousto-optic is alarmed simultaneously.2, the globefish of IC4, IC5 dashes vibration, promotes V5 through IC6, and between T1T2, V5 is Low ESR.If appropriator is left away, it is normal that circuit then recovers automatically, if appropriator is not left away, then continues to combine and patrol; be that V5 is high-impedance state between t2 → t3, the swinging cross circuit is worked on, the protection outside line is not is not invaded and harassed; as long as appropriator stays, this just patrols repeatedly and visits, till appropriator is left away.When the own off-hook of user, it is bright that electric current constitutes loop D5 (green) from L2 → telephone set → D5 → L1, and its pressure drop makes the V1 conducting, and V2, V3 end, and block V4, when this has just guaranteed that own off-hook is made a phone call, do not shield.Another function of the present utility model is the extension set interlock function.This circuit utilizes at ordinary times that line scan pickup coil side voltage is 48V, is higher than diac voltage, can trigger the controllable silicon conducting.Line voltage distribution is to be lower than the diac trigger voltage about 12V behind the off-hook, and controllable silicon is blocked, make this principle of circuit interruption, realizes interlocking.When the 1# off-hook, line voltage distribution makes the V6 conducting greater than the trigger voltage of D7, but 1# machine dialing conversation, line voltage distribution drops to 12V behind the 1# machine off-hook, and 2# is off-hook again, and V7 does not know clearly with regard to conducting, so 2 machines are in the blocking-up attitude, can't hear the speech of 1# machine.Promptly be blocked.Same 2# off-hook also can block the 1# machine.

Claims (7)

1, a kind of phone anti-theft protector is characterized in that by electronics swinging cross circuit, antitheft testing circuit, personal testing circuit, promotes amplifying circuit, mistake proofing circuit, audible and visual alarm circuit, patrols and visit circuit, extension set interlock circuit and connection line thereof and formed automatically; The diode D1 of electronics swinging cross circuit, 2 is connected with integrated circuit block IC in telephone wire L1, L2 and the audible and visual alarm circuit respectively with triode V4; The optocoupler V5 that promotes in the amplifying circuit is connected with triode V1 in the antitheft testing circuit with integrated circuit block IC respectively; The extension set interlock circuit is made up of bidirectional triode thyristor V6, V7 bidirectional trigger diode D7, D8 and capacitor C 4, C5, connects in the wiring at one end.

2, phone anti-theft protector according to claim 1 is characterized in that electronics swinging cross circuit is made up of diode D1, D2, triode V4 and connection line thereof; Antitheft testing circuit is made up of resistance R 2, R3, R4, triode V1 and connection line thereof.

3, phone anti-theft protector according to claim 1 is characterized in that personal testing circuit is made up of diode D3, D5, resistance R 5, triode V1 and connection line thereof; The mistake proofing circuit is made up of resistance R 1, capacitor C 1 and connection line thereof.

4, phone anti-theft protector according to claim 1; It is characterized in that promoting amplifying circuit is made up of resistance R 2, triode V1, V2, V3 optocoupler V5 and connection line thereof.

5, phone anti-theft protector according to claim 1; It is characterized in that the audible and visual alarm circuit is made up of application-specific integrated circuit (ASIC) piece IC, resistance R 6, capacitor C 2 and connection line thereof; The IC model is CD4069.

6, phone anti-theft protector according to claim 1 is characterized in that automatic routing inspection circuit is made up of optocoupler V5, application-specific integrated circuit (ASIC) piece IC and connection line thereof.

7, phone anti-theft protector according to claim 1 is characterized in that the extension set interlock circuit is made up of bidirectional triode thyristor V6, V7 bidirectional trigger diode D7, D8, capacitor C 4, C5 and connection line thereof.

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