CN2335316Y - Urbran telephone terminal multi-function protector - Google Patents

Abstract

The utility model discloses an urban telephone terminal multi-function protector, which is composed of an outer shell and an electronic circuit. The electronic circuit is composed of an overcurrent protection self-restoring circuit, a lightningproof overvoltage protection circuit, a preventive larcenous calling and anti-eavesdropping circuit, an unlocking current limiting protection circuit of the protector, a terminal extension telephone of an outer line interlocking circuit, and a jamming formation acoustic-optic alarm circuit. The utility model can effectively prevent the phenomena of the larcenous calling and eavesdropping of the outer line from taking place, an interlocking confidential means is provided for a main telephone and each extension telephone, and the infringement that lightning strike voltage exerts the terminal equipment of the urban telephone can be effectively prevented simultaneously. The utility model also has the advantages of compact line, high reliability, etc. The utility model is requisite equipment in the communication of the urban telephone.

Description

A kind of city telephone terminal multi-function protector

The utility model relates to a kind of multi-function protector that communication terminal equipment is protected that is used for, and refers more particularly to the multi-function protector that local telephone network terminal equipment such as telephone set, facsimile machine etc. are protected, and belongs to electronic technology field.

Telephone set, facsimile machine are important means and the equipment that present information exchanges, and its social owning amount is increasing.But in the use of these equipment, some often occur and make us being difficult to satisfied problem: the one, owing to the damage that often causes equipment of scurrying into of local line induction lightening pressure or civil power; The 2nd, owing to some lawless person's free call on sb. else's expense through illegal means, eavesdropping behavior cause great economy and emotional distress to the user; The 3rd, when the user uses when taking parallel operation for convenient, often between master-extension set, can not maintain secrecy mutually between extension set-extension set.Occurred multiple local telephone network protector at present, as anti-lightening protector, anti-free call on sb. else's expense through illegal means protector etc., this class protector can only carry out the individual event protection.

The purpose of this utility model is to provide that a kind of circuit is simple, defencive function is complete, city's telephone terminal multi-function protector that reliability is high.

The utility model is realized by following technical scheme: the utility model includes shell and electronic circuit.In described electronic circuit; overcurrent protection self-repairing circuit (1), lightning protection excess voltage protection (2), anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), this machine release current-limiting protection circuit (4), outside line terminal extension set interlock circuit (5) connect in regular turn; anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) also links to each other with disturbing formation sound light alarming circuit (6); disturb formation sound light alarming circuit (6) also signal feedback to be given anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) simultaneously, this machine release current-limiting protection circuit (4) is also given signal feedback anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3).

Special character of the present utility model also is: in anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3); the bridge rectifier that D1-D4 forms; its input is connected across local telephone network two transmission lines φ 1; on the φ 2; C1 is connected across rectifier output end A; on the B; D9; D10; the A of R3 series connection back cross-over connection rectifier; on the B end; D10; the common port of R3 connects the base stage of triode V1 by R4; the V1 emitter connects rectifier A end; collector electrode connects triode V2 base stage by R6 and connects the B end of rectifier by R5; the signal output part that connects this machine release current-limiting protection circuit (4) simultaneously, V2 emitter connect the A end of rectifier; current collection is signal output part very.

In described machine release current-limiting protection circuit (4), diode D5-D8 forms bridge rectifier, and one of its input connects local telephone network transmission line φ 1, another signal input part as outside line terminal extension set interlock circuit (5); Resistance R 1 is connected across on output C, the D of rectifier, on resistance R 2 and the C that is connected across rectifier after the input of optocoupler integrated circuit (IC) 1 is connected, the D end, rectifier A end, the other end that one of the output of IC1 is taken over control in the free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) are that signal output part links to each other with the V1 collector electrode.

In described outside line terminal extension set interlock circuit (5), diode D11, resistance R 2 series connection backs extremely link to each other with the control of SCR1 with the mid point of controllable silicon SCR 1 parallel connection, series connection, input of the rectifier in the two ends of parallel circuits in this machine of termination release current-limiting protection circuit (4) and be output c as output a, the other end; Resistance R 7, diode D2 series connection back extremely links to each other with the control of SCR2 with controllable silicon SCR 2 parallel connections, series connection mid point, and input that connects rectifier in this machine release current-limiting protection circuit (4) in the common port of parallel circuits, another is as Ausgang.Local telephone network transmission line φ 2 is branched off into output b, d, e.Output a, b connect the local telephone network main frame, and output c, d are connected the local telephone network extension set respectively with e, f.

Form in the sound light alarming circuit (6) in described interference, the base stage of triode V3 links to each other with the output of anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) by resistance R 11, emitter is taken over control rectifier B end in the free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) by diode D13, collector electrode links to each other with the power end of IC2, the IC2 earth terminal links to each other with rectifier A end in the anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), cross-over connection capacitor C 2 between IC2 power end and earth terminal, IC2 output and V4 base stage are joined, the V4 emitter links to each other with rectifier A end in the anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), and collector electrode is by the resistance R 8 of series connection, loud speaker Y and anti-free call on sb. else's expense through illegal means anti-eavesdrop are that the rectifier B end in the road (3) links to each other.

Another special character of the present utility model is: separate in the pin current-limiting protection circuit (4) at described machine; be composed in series a constant-current source circuit by triode V6, resistance R 20 and be serially connected on the common port of rectifier D end and IC1 input, the current-limiting protection effect is further strengthened.

Form in the sound light alarming circuit (6) in described interference, NAND gate circuit IC2-IC5 and peripheral cell are formed the two-stage multivibrator, oscillator signal output after the amplifier that triode V4, V5 form amplifies.

Operation principle of the present utility model is: when this machine off-hook is conversed, photoelectric coupled circuit IC1 in this machine release current-limiting protection circuit (4) is in conducting state, the current collection of triode V1 is low level very, anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) no signal output, disturb formation sound light alarming circuit (6) not work, thereby make conversation normally carry out; When free call on sb. else's expense through illegal means, when the eavesdropping phenomenon takes place, outside line voltage drops to the fiducial value that is lower than D9, D10 and sets, V1 by, V2 conducting, it is in running order to make that interference forms sound light alarming circuit (6), its oscillator signal provides the sound and light alarm signal on the one hand, this signal feeds back in the outside line by the local telephone network transmission line as interference signal source on the other hand, makes free call on sb. else's expense through illegal means, listener-in to succeed; When a minute phone (dividing phone with c, d end is example) off-hook, because local telephone network passes the operating voltage of the voltage of subordinate line greater than diac D11, the SCR1 conducting, make c, d end divide phone work, and the terminal voltage of D12 is lower than its operating voltage, so SCR2 not conducting, make that the branch phone of e, f end can't operate as normal, thereby reach the purpose that the extension set interlocking is maintained secrecy.

The utility model can prevent effectively that outside line free call on sb. else's expense through illegal means, eavesdropping phenomenon from taking place, and the application to each extension set simultaneously provides interlocking secret means; The utility model can also be prevented the infringement of thunderbolt voltage to the local telephone network terminal equipment effectively.The utility model also has simple in circuits, reliability advantages of higher, is a kind of imperative equipment in the local telephone communication.

Description of drawings.

Fig. 1 is the electric functional-block diagram of the utility model embodiment,

Fig. 2 is the electrical schematic diagram of the utility model embodiment 1,

Fig. 3 is the electrical schematic diagram of the utility model embodiment 2.

Below in conjunction with the embodiment that provides the utility model is described further.

Embodiment 1, with reference to Fig. 1, Fig. 2.In the overcurrent protection self-repairing circuit (1) in the present embodiment, the PTC resistance string is connected on the local telephone network transmission line φ 1.PTC resistance for high withstand voltage, Low ESR, low operating current, have the PTC thermistor of self-recovering function.In lightning protection excess voltage protection (2), piezo-resistance MY1 is connected across on local telephone network transmission line φ 1, the φ 2.In anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3); diode D1-D4 forms the bridge rectifier directional circuit; two input is connected across on local telephone network transmission line φ 1, the φ 2; D9, D10, R3 series connection back C1 in parallel, its two ends join with A, the B end of rectifier respectively; the mid point of D10, R3 connects triode V1 base stage by R4; the V1 emitter connects rectifier A end; collector electrode connects the V2 base stage and connects the output that rectifier B holds, also connects this machine release current-limiting protection circuit (4) simultaneously by R5 by R6, and the V2 emitter connects very signal output part of rectifier A end, current collection.In this machine release current-limiting protection circuit (4), D5-D8 forms the bridge rectifier directional circuit, and one of its input and local telephone network transmission line φ 1 join, and another joins as signal output part and outside line terminal extension set interlock circuit (5); R1 is connected across rectifier C, D end, R2 be attempted by the R1 two ends after the input of IC1 is connected, one of the output of IC1 is taken over control the V1 collector electrode in the free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), the rectifier A in another and the anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) holds and joins.In outside line terminal extension set interlock circuit (5), D11 extremely links to each other with SCR1 control with R9 series connection back SCR1 in parallel, its mid point, an input a of the rectifier in the two ends of parallel circuits in this machine of termination release current-limiting protection circuit (4), another is output c; R7, D12 series connection back SCR2 in parallel, its mid point extremely link to each other with SCR2 control, and an end of parallel circuits is by the input of rectifier in this machine release current-limiting protection circuit (4), and the other end is as Ausgang; Local telephone network transmission line φ 2 is branched off into signal output part b, d, e.In disturbing formation sound light alarming circuit (6), the V3 base stage is taken over control the V2 collector electrode of free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) by R11, emitter is held by the rectifier B that light-emitting diode D13 takes over control in the free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), collector electrode connects rectifier A end by IC2 and C2, rectifier A end, collector electrode that IC2 output termination V4 base stage, V4 emitter are taken over control in the free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) connect rectifier B end by R8, the Y of series connection.In the present embodiment, IC1 is a 4N25 type optical coupler, and IC2 is a CL9561 type speech IC, and triode V1, V2, V4 are 2N5551 type NPN triode, and SCR1, SCR2 are the 1A/600V controllable silicon, and V3 is a 2N5401 type PNP triode.

Embodiment 2.With reference to Fig. 1, Fig. 3.Present embodiment and last embodiment difference are: in overcurrent protection self-repairing circuit (1), thermistor PTC1, PTC2 are serially connected in respectively on local telephone network transmission line φ 1, the φ 2.In lightning protection excess voltage protection (2), L1, L2 are serially connected with respectively on local telephone network transmission line φ 1, the φ 2, and piezo-resistance MY1-MY3 is connected on respectively between 2 of φ 1, φ and φ 1, φ 2 and the ground, and diode TVS is connected across 2 of φ 1, φ.In this machine release current-limiting protection circuit (4), connecting with the IC1 input at R2 is connected in series the constant-current source circuit that V6, R20 form between the common port of parallel circuits of back R1 in parallel and rectifier D end.In disturbing formation sound light alarming circuit (6), integrated circuit (IC) 2-IC5 and peripheral cell are formed the two-stage multivibrator, connect the push-pull amplifier that V4, a V5 and peripheral cell are formed again.In the present embodiment, IC2-IC5 is a bright NAND gate integrated circuit of CD4011 type, and V5 is a 2N5401 type PNP triode, and PTC1, PTC2 are MZ22BD type thermistor, MY1-MY3 is the 3KA/250V piezo-resistance, and diode TVS is the two-way silicon voltage regulator diode of 300V/1500W.Present embodiment is compared with last embodiment, the circuit slightly complicated, and cost is slightly high, but protection effect and reliability are much higher.

Claims (7)

1; a kind of city telephone terminal multi-function protector; it comprises a shell and electronic circuit; it is characterized in that: in electronic circuit; overcurrent protection self-repairing circuit (1); lightning protection excess voltage protection (2); anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3); this machine release current-limiting protection circuit (4); outside line terminal extension set interlock circuit (5) joins successively; anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3) also joins with disturbing formation sound light alarming circuit (6); disturb formation sound light alarming circuit (6) also signal feedback to be arrived in the anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), this machine release current-limiting protection circuit (4) also arrives signal feedback in the anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit (3).

2, city according to claim 1 telephone terminal multi-function protector; it is characterized in that: in listening the anti-free call on sb. else's expense through illegal means anti-eavesdrop circuit of stating (3); D1-D4 forms bridge rectifier; two input is connected across between rectifier A, B end after being connected across 2 of local telephone network transmission line φ 1, φ, D9, D10, R3 series connection C1 in parallel again; the mid point of D10, R3 connects the V1 base stage by R4; the V1 emitter connects rectifier A end, collector electrode and connects V2 base stage and rectifier B end by R6, R5 respectively, and V2 current collection very signal output part, emitter connects rectifier A end.

3, city according to claim 1 telephone terminal multi-function protector; it is characterized in that: in described machine release current-limiting protection circuit (4); D5-D8 forms bridge rectifier; one of its input joins with φ 1, another is as signal output part; R1 in parallel between its two output C, D; connect the two ends of R1 after R2 and the series connection of IC1 input respectively, one of the output of IC1 is taken over control the middle rectifier A end of free call on sb. else's expense through illegal means anti-eavesdrop circuit (3), the other end is that signal output part links to each other with the V1 collector electrode.

4, city according to claim 1 terminal multi-function protector alive.It is characterized in that: in described outside line terminal extension set interlock circuit (5); D11 extremely links to each other with SCR1 control with SCR1 parallel connection, series connection mid point with R9 series connection back; one end of parallel circuits connect this machine release current-limiting protection circuit (4) rectifier signal output part and as output a, its other end as output c; R7, D12 series connection back is in parallel with SCR2; the series connection mid point extremely links to each other with SCR2 control, an end of parallel circuits is connected the signal output part of rectifier, the other end as signal output part f, and φ 2 is branched off into signal output part b, d, e.

5, city according to claim 1 telephone terminal multi-function protector is characterized in that: it is an audio alert and a signal amplification circuit of being made up of IC2, V3, V4 and peripheral cell that described interference forms acousto-optic utmost point warning circuit (6).

6, city according to claim 1 telephone terminal multi-function protector; it is characterized in that: in described machine lock current-limiting protection circuit (4), can also between the common port of rectifier D end and R1, IC1 input, be connected in series a constant-current source circuit of forming by V6, R20.

7, local telephone network end multi-function protector according to claim 1 is characterized in that: disturb to form the push-pull type amplifying circuit that two-stage multivibrator that sound light alarming circuit (6) can also be made of IC2-IC5 and peripheral cell and V4, V5 and peripheral cell constitute and form.

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