CN2172548Y - Multifunctional telephone junction box - Google Patents

Abstract

The utility model relates to a multifunctional telephone junction box, which is composed of a wiring terminal, working circuits and a box body, wherein, the working circuits comprises a work test circuit, a voltage detection circuit, a current detection circuit, a logical judgment circuit, a sound and light alarm circuit, a delay circuit and an R-S trigger. The utility model can conveniently detect whether the telephone circuit is embezzled by other people or not and whether the telephone circuit has situations of broken circuit, short circuit, swinging cross, etc., and can carry out sound and light alarm, and thus, economic loss for users can be avoided and normal talking can be carried out for users. The utility model has the advantages of simple structure and low cost.

Description

Multifunctional telephone junction box

The utility model relates to a kind of improved telephone connection box, particularly can the monitoring telephone circuit have or not steal with and have or not open circuit, the multi-function telephones terminal box of faults such as short circuit, swinging cross.

Common telephone connection box can only be finished the task of connecting outside line and phone merely, and in the telephone network running, some telephone line takes place often stolen the situation of usefulness by other people, like this, the user is sustained a loss economically, and influence the reputation of telecommunication department.In addition,, be exposed to the elements, open circuit, situations such as short circuit, swinging cross happen occasionally because the communication line major part is exposed to outdoorly, the difficult fault of finding of user, the influence conversation is normally carried out.

Task of the present utility model is to provide a kind of multi-function telephones terminal box, this kind terminal box is except having the function that connects outside line and phone, can detect easily have or not the stranger to steal to have or not with this telephone line and telephone line open circuit, situations such as short circuit, swinging cross, and inform the user in the mode of sound and light alarm, thereby make the user avoid economic loss, be beneficial to phone and normally use.

The utility model is to realize like this.It is by work test circuit voltage detecting circuit, current detection circuit, and logic judging circuit, delay circuit, sound light alarming circuit, binding post and box body are formed.Its operation principle is as follows: when telephone network normally moved, telephone exchange was presented 48V or 60V direct voltage by telephone line to substation; When the user was in hook state, the substation two ends were high-impedance state, thereby the voltage at phone two ends is near the feed voltage (greater than 40V) of telephone exchange, and the electric current by substation approaches zero simultaneously; When user's off-hook used phone, because the telephone loop conducting, the supply power voltage of switch was through the dividing potential drop effect of feed bridge, telephone line, and the voltage that falls at the phone two ends is about 6～12V, and the electric current by phone is about 20～50mA simultaneously; When the stranger steal with this telephone line or telephone line open circuit, during fault such as short circuit, swinging cross, this telephone set both end voltage drops to 0～12V, and the electric current by this phone approaches zero simultaneously, at this moment, this telephone connection box just starts sound and light alarm, makes the user in time find situation.

The utility model is simple in structure, and cost of manufacture is low, utilize it can detect easily have or not the stranger to steal to have or not with this telephone line and telephone line open circuit, situations such as short circuit, swinging cross, but and sound and light alarm, make the user avoid economic loss, normal talking is suitable for extensive popularization to be adopted.

Accompanying drawing is circuit theory diagrams of the present utility model.

Below in conjunction with accompanying drawing enforcement of the present utility model is elaborated.

In the circuit of the present utility model, binding post a1, b1 are in order to connect the outside line that telephone office's (station) comes, and binding post a2, b2 are in order to connect this user's telephone set.Constituting one by resistance R 1, testing button AN1 whether normally is used for simulating the stranger and steals with telephone line to test this terminal box work test circuit.Constitute the voltage detecting circuit of a detection telephone set both end voltage by resistance R 2, diode rectifier bridge BG1-4, voltage-stabiliser tube BG9, triode BG10, load resistance R4, normal and when idle when telephone line, its voltage between lines is 48～60V, thereby voltage-stabiliser tube BG9 reverse breakdown conducting, also conducting of triode BG10, its collector electrode is output as low level; When telephone line occupied or occur opening circuit, during fault such as short circuit, the telephone set both end voltage drops to 0～12V, thereby voltage-stabiliser tube BG9, triode BG10 all end, triode BG10 collector electrode is output as high level.Constitute a current detection circuit that detects this phone current status by current-limiting resistance R3, photoelectrical coupler BG11, BG12, load resistance R5, overcurrent protection diode BG5-8, when this phone is in static state, by its electric current approaching zero, thereby photoelectrical coupler ends, and its collector electrode is output as high level; When incoming ring or this user off-hook used, the electric current by phone was 2～50mA, thereby the photoelectrical coupler conducting, and its collector electrode is output as low level; When having big electric current to pass through on the telephone line, current-limiting resistance R3 and photoelectrical coupler pressure drop sum are greater than 2 diode drop sums, and photoelectrical coupler is protected in current limliting diode BG5-8 conducting.Triode BG10 and output that be made of photoelectrical coupler BG11, BG12 or door enter two inputs of logic judging circuit (being NAND gate D1) respectively, when the on-hook of this phone, the phone both end voltage is normal, and electric current is zero, thus D1 be input as a low level and a high level; When this receiver off-book used, the phone both end voltage descended, and has electric current to pass through, thus D1 be input as a high level and a low level.More than under two kinds of situations, the output of NAND gate D1 is high level.When except that this phone, have other phone to use this telephone line or this telephone line opens circuit, during short trouble, then this phone both end voltage descends, and the electric current by this phone is zero, thereby the input of D1 is high level, thereby the acousto-optic device that drives the back is reported to the police.Output resistance by capacitor C 1 and D1 constitutes a R, C delay circuit, in order to the false triggering that prevents that the temporary transient output of D1 from causing.Constitute a sound light alarming circuit by NAND gate D2, D3, D4, differential capacitance C2, music-integrating block BG13, loud speaker BG14, luminous tube BG15, current-limiting resistance R7 and pull-up resistor R6, when this user normally uses, the input of D2 is a high level, and its output is a low level; As the people steal with or circuit when fault is arranged, the input of D2, output are respectively low level and high level, through the derivative action of capacitor C 2, give triggering signal of music-integrating block BG13 when the output of D2 changes from low to high, and start the loud speaker BG14 warning of sounding; The R-S trigger that is made of NAND gate D3, D4 is in reset mode at ordinary times, and D3 is output as low level, and D4 is output as high level, thereby luminous tube BG15 is not luminous, when the output of D1 be D3 be input as low level the time, D3 is output as high level, D4 is output as low level, thereby the luminous warning of luminous tube; When the stranger stops the time spent steathily, though the output of D1 is that the input of D3 is a high level, but, D4 output still is low level because being another input of D3, thereby the output of D3 keeps high level, luminous tube continues luminous, after pressing reset button AN2, the R-S trigger reset, luminous tube stops luminous.The electronic component specifications and models that adopt in the foregoing circuit are as follows:

Resistance R 1 300 Ω, R2 10～100M Ω,

R3 6Ω， R4 100～1000KΩ，

R5 1～100kΩ， R6 1～100KΩ，

R7 100～5000Ω；

Capacitor C 1, C2 1 μ F～100 μ F/10V;

Diode BG1-4, BG5-8 1A400V;

Voltage-stabiliser tube BG9 12～40V;

Triode BG10 9013 types or other replaceable product;

Photoelectrical coupler BG11, BG12 4N25 type or other replaceable product;

Music-integrating block BG13 is optional; Loud speaker BG14 8 Ω, 0.1W;

Optional φ 3 luminous tubes of luminous tube BG15;

NAND gate D1, D2, D3, D4 can use cmos type integrated package CD4011 or other replaceable product.

During enforcement with above circuit production in the plastic casing of 80 * a 60 * 30mm, and be connected with telephone set with outside line respectively.Click reset button AN2 before the use earlier and make it to reset, click testing button AN1 then, as send sound and light alarm, show that then this multi-functional wiring box has entered operate as normal.Power consumption 25 μ A only used No. 5 batteries of 2 joints can work more than 2 years when entire circuit was static.

Claims (8)

1, a kind of multi-function telephones terminal box, form by binding post, operating circuit and box body, it is characterized in that operating circuit comprises work test circuit, voltage detecting circuit, current detection circuit, logic judging circuit, sound light alarming circuit, R-S trigger and delay circuit.

2, multi-function telephones terminal box according to claim 1 is characterized in that, the work test circuit is made of resistance R 1 and testing button AN1.

3, multi-function telephones terminal box according to claim 1 is characterized in that, voltage detecting circuit is made of resistance R 2, diode rectifier bridge BG1-4, voltage-stabiliser tube BG9, triode BG10 and load resistance R4.

4, multi-function telephones terminal box according to claim 1 is characterized in that, current detection circuit is made of current-limiting resistance R3, photoelectrical coupler BG11, BG12, load resistance R5 and overcurrent protection diode BG5-8.

5, multi-function telephones terminal box according to claim 1 is characterized in that, logic judging circuit is made of NAND gate D1.

6, multi-function telephones terminal box according to claim 1 is characterized in that, delay circuit is made of the output resistance of capacitor C 1 and NAND gate.

7, multi-function telephones terminal box according to claim 1, it is characterized in that sound light alarming circuit is made of NAND gate D2, D3, D4, differential capacitance C2, music-integrating block BG13, loud speaker BG14, luminous tube BG15, current-limiting resistance R7 and pull-up resistor R6.

8, multi-function telephones terminal box according to claim 1 is characterized in that, the R-S trigger is made of NAND gate D3, D4.