CN2208300Y

CN2208300Y - Telephone protector

Info

Publication number: CN2208300Y
Application number: CN 94220167
Authority: CN
Inventors: 陈瑞琦
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-26
Filing date: 1994-08-26
Publication date: 1995-09-20
Anticipated expiration: 2004-08-26

Abstract

The utility model relates to a telephone compositive protector comprising a housing, a circuit board, an optical acoustic warning part and an optical acoustic connecting part. The circuit board comprises an overvoltage suppressor 21, a voltage discriminator 22, an eavesdrop current limiter 23, a circulating current detector 24 comprising resistor and a transistor, an alarm starter 25, an alarm circuit 26 and an extension telephone exclusive line unit 27. The telephone compositive protector can be used for theft protection, eavesdrop protection and lightning protection, and has the exclusive function of the extension telephone, Moreover, the telephone compositive protector has little energy consumption and convenient operation, and combines the device for theft-proof of telephone and the lightning protection connection box into integration.

Description

Telephone protector

The utility model relates to the communication terminal equipment protective device, and especially telephone prevents eavesdropping or usurps device.

Prior art phone protector; the needs that have are installed battery, the power consumption that has big (quiescent current＞300 μ A), and the single employing binding post or the socket mode that have connect; use inconvenience, the input that also has connects inverse time sound and light alarm signal indeterminately maybe needs to open the particular switch inspection.In addition, the phone protector of Chu Shouing does not have anti-lightning strike function in the market, need take over control the thunderbolt terminal box simultaneously, the circuit burden that seems like this, and increased supply load.Its alarm signal of phone protector that also has is in addition influenced by line length, is growing distance or is closely descending eavesdropping to report to the police.

The utility model purpose be to avoid above-mentioned prior art weak point and provide a kind of have anti-usurp, anti-eavesdrop, anti-lightning strike and have the phone comprehensive protection device that extension set is monopolized function, and power consumption is little, easy to use.

For achieving the above object, the utility model provides a kind of phone comprehensive protection device, comprises shell, circuit board, optoacoustic warning piece and link.In technical solution of the present utility model, circuit board comprises the excess voltage suppressor that contains piezo-resistance; The voltage identification that contains resistance and triode; The eavesdropping flow restricter that contains resistance and electric capacity parallel branch; The circulation detector that contains resistance and triode; The warning starter that contains resistance, electric capacity and triode; Contain the warning circuit of music integrated circuit, light-emitting diode and buzzer, and the extension set that contains bidirectional trigger diode and bidirectional thyristor is monopolized line unit.

Described excess voltage suppressor is connected across between the top positive and negative end telephone wire; Voltage identification is immediately following also being connected across between the positive and negative terminal telephone wire thereafter, and the output of voltage identification joins with circulation detector and warning starter simultaneously; The eavesdropping flow restricter is serially connected on the anode telephone wire, is thereafter that extension set is monopolized device; Circulation detector is serially connected on the negative terminal telephone wire, and device is monopolized in extension thereafter; The signal end of warning starter links to each other with voltage identification, and actuating station is connected to warning circuit, and common port is connected on after the negative terminal telephone wire circulation detector; Warning circuit and extension set are connected across on eavesdropping flow restricter and the circulation detector positive and negative end telephone wire afterwards after monopolizing the line unit parallel connection together.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the product structure schematic diagram;

Fig. 2 is the logic block-diagram of the utility model phone comprehensive protection device;

Fig. 3 is the basic circuit diagram of a most preferred embodiment of the utility model.

Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing.

As shown in Figure 1, the utility model phone comprehensive protection device comprises shell 1, be installed in the circuit board 2 in the shell 1 and be installed in the optoacoustic warning piece 3 of case surface, for example indicator light, and link 4.Link 4 comprises socket and binding post, and two kinds have.

Fig. 2 and Fig. 3 show logic block-diagram of the present utility model and basic circuit diagram.Excess voltage suppressor 21 is made of piezo-resistance Rv, is used to absorb voltage surge and the protection thunderbolt that circuit imports into.Voltage identification 22 comprises resitstance voltage divider R1-R2, the base stage connecting resistance R1 of triode V1, the tie point of R2, and emitter is connected with negative terminal telephone wire B, is connected to anode telephone wire A behind the collector electrode connecting resistance R3.The base stage of triode V2 links to each other with the collector electrode of triode V1, in emitter e 2 and the circulation detector 24 in the collector electrode C3 of triode V3 and the warning starter 25 the base stage b4 of triode V4 link to each other simultaneously, when phone is in off hook state (comprise the user is normal use and usurped) by the people, input voltage is reduced to below the 10V by the 48V of switch supply, the effect of resistance R 1 and R2 ends triode V1, and triode V2 is saturated.In eavesdropping flow restricter 23, resistance R 7 guarantees the Current Control of subscriber equipment under the eavesdropping state in 20mA, with the startup effect of the starter 25 of guaranteeing to report to the police.Circulation detector 24 contained resistance R 5 are serially connected between negative terminal telephone wire B, the D, and the base stage of triode V3 is connected on the resistance R 5 negative terminal telephone wire B before, and collector electrode links to each other with the emitter of the triode V2 of voltage identification 22.When usurping or the eavesdropping situation, circulation＜20mA, the pressure drop deficiency of resistance R 5 is so that triode V3 conducting, so that triode V4 conducting and start warning.When circulation＞25mA, triode V3 is saturated, with the whole short circuits of electric current of triode V2 output.Resistance R 6 is in parallel with capacitor C 1 in warning starter 25, and its two ends are connected with emitter with the base stage of triode V4 respectively, and the collector electrode of triode V4 is connected with warning circuit 26.When the base stage of triode V4 has when importing greater than the 0.1mA electric current, triode V4 is saturated, thereby starts warning circuit 26.Warning circuit 26 comprises the bridge rectifier that diode V6, V7 and light-emitting diode V9, V10 form, then contact on the diagonal of bridge circuit then voltage-stabiliser tube V8 and resistance R 8; Voltage-stabiliser tube V8 is used for providing stable power to music integrated circuit D, makes it can export stable voltage signal.The effect of resistance R 9 and triode V5 is that this voltage signal is become current signal.When input polarity connects inverse time, because telephone line generally all is in hook state, voltage is higher, so increase resistance R 11 current limlitings.Resistance R 11 1 ends link to each other with the anode of light-emitting diode V10, another termination negative terminal telephone wire D.Monopolize in the device 27 at extension set, arbitrary input of the arbitrary extension set that uses in parallel answer the call line C or D, its other end is received on another telephone wire by thyristor V12 or V13 again.Bidirectional trigger diode V11, V12 are connected across respectively between the gate electrode and the first anode of bidirectional thyristor V13, V14.

In addition, be the needs of line maintenance and test, also be provided with double-point double-throw switch S on circuit board 2, its moving contact S1-1 is connected on anode telephone wire A and goes up between excess voltage suppressor 21 and the voltage identification 22; Moving contact S2-1 is connected on anode telephone wire C and goes up after the eavesdropping flow restricter 23, and two fixed contact S1-2 and S2-2 are electrically connected mutually.Throw when leading directly to side when described switch S, can normally carry out line maintenance and test, and can be with usurping or listener-in's dialogue.

Compare with the existing various protector for telephones of selling; the utlity model has the safeguard measure of several functions; can usurp, eavesdrop and input connects automatic sound-light alarm under the rp state; quiescent current little (generally speaking less than 15 μ A); also have in addition anti-lightning strike and the overvoltage function, avoid loss to protect this device and subscriber equipment. Can and connect two extensions, and maintain secrecy mutually between the extension set and monopolize effect to reach. The utility model is easy to use, be substitute existingly anti-ly usurp, new generation telephony comprehensive protection device that anti-eavesdrop protector and anti-lightning strike wiring are closed.

Claims

1, a kind of phone comprehensive protection device comprises shell (1), circuit board (2), optoacoustic warning piece (3) and link (4), it is characterized in that: described circuit board (2) comprises the excess voltage suppressor (21) that contains piezo-resistance RV; The voltage identification (22) that contains resistance R 1-R3, triode V1, V2; The eavesdropping flow restricter (23) that contains resistance R 7 and capacitor C 3 parallel branches; Contain resistance R 5, the circulation detector of triode V3 (24); The warning starter (25) that contains resistance R 6, capacitor C 1, triode V4; The warning circuit (26) that contains music integrated circuit D, light-emitting diode V9, V10 and buzzer B; And the extension set that contains bidirectional trigger diode V11, V12 and bidirectional thyristor V13, V14 is monopolized line unit (27);

Described excess voltage suppressor (21) is connected across between top positive and negative end telephone wire A, the B; Voltage identification (22) also is connected across between positive and negative terminal telephone wire A, the B following closely, and the output e2 of voltage identification (22) joins with circulation detector (24) and warning starter (25) simultaneously; Eavesdropping flow restricter (23) is serially connected between anode telephone wire A, the C; Circulation detector (24) is serially connected between negative terminal telephone wire B, the D; The signal end S of warning starter (25) links to each other with voltage identification (22), and actuating station P is connected to warning circuit (26), and common port C links to each other with telephone wire D; Warning circuit (26) and extension set are connected across on eavesdropping flow restricter (23) and circulation detector (24) positive and negative end telephone wire C, the D afterwards after monopolizing line unit (27) parallel connection together.

2, phone comprehensive protection device according to claim 1 is characterized in that: the input/output terminal of described link (4) is equipped with socket and two kinds of connected modes of binding post.

3, phone comprehensive protection device according to claim 1 is characterized in that: described voltage identification (22) comprises resitstance voltage divider R1-R2; The base stage connecting resistance R1 of triode V1, the tie point of R2, emitter is connected with negative terminal telephone wire B, is connected to anode telephone wire A behind the collector electrode connecting resistance R3; The base stage of triode V2 links to each other with the collector electrode of triode V1, and emitter e 2 links to each other simultaneously with the collector electrode C3 of the middle triode V3 of circulation detector (24) and the base stage b4 of the middle triode of warning starter (25).

4, phone comprehensive protection device according to claim 1; it is characterized in that: the contained resistance R 5 of described circulation detector (24) is connected between negative terminal telephone wire B, the D; the base stage of triode V3 is connected on the resistance R 5 negative terminal telephone wire D afterwards; emitter is connected on the resistance R 5 negative terminal telephone wire B before, and collector electrode links to each other with the emitter of the triode V2 of voltage identification (22).

5, phone comprehensive protection device according to claim 1; it is characterized in that: resistance R 6 is in parallel with capacitor C 1 in the described warning starter (25); its two ends are connected with emitter with the base stage of triode V4 respectively, and the collector electrode of triode V4 is connected with warning circuit (26).

6, phone comprehensive protection device according to claim 1, it is characterized in that: described warning circuit (26) comprises the bridge rectifier that diode V6, V7 and light-emitting diode V9, V10 form, and voltage-stabiliser tube V8 and resistance R 8 then are being connected in series on the diagonal of bridge circuit; Resistance R 11 1 ends link to each other with the anode of light-emitting diode V10, on another termination negative terminal telephone wire D.

7, phone comprehensive protection device according to claim 1, it is characterized in that: arbitrary input that described extension set is monopolized arbitrary extension set in the line unit (27) answer the call line C or D, its other end is received on another telephone wire by bidirectional thyristor V14 or V13 again; Bidirectional trigger diode V11, V12 are connected across respectively between the gate electrode and the first anode of bidirectional thyristor V13, V14.

8, phone comprehensive protection device according to claim 1, it is characterized in that: described circuit board is provided with double-point double-throw switch S on (2), and its moving contact S1-1 is connected on anode telephone wire A and goes up between excess voltage suppressor (21) and the voltage identification (22); Moving contact S2-1 is connected on anode telephone wire C and goes up eavesdropping flow restricter (23) afterwards, and two fixed contact S1-2 and S2-2 are electrically connected mutually.