CN2353101Y

CN2353101Y - Arrangement for preventing from fraudulent use of telephone

Info

Publication number: CN2353101Y
Application number: CN 98216308
Authority: CN
Inventors: 胡楚怡
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-06-28
Filing date: 1998-06-28
Publication date: 1999-12-08
Anticipated expiration: 2008-06-28

Abstract

The utility model discloses a telephone embezzlement preventing device capable of preventing telephone embezzlement with parallel operation on an outside line, composed of a shell and a circuit in the shell. The circuit is formed by that a voltage detecting network, a current detecting network, an oscillating circuit and an amplifying tube are connected between output positive and negative poles of a bridge rectifying circuit. With the features of simple structure, low cost, reliable work and convenient operation, the utility model arranged in front of or in a subscriber telephone can tightly lock an embezzler's telephone which can not dial out any telephone, can not affect a telephone subscriber to use the telephone, can not do any harmful effect on telecommunication equipment and can thoroughly release the worry of telephone embezzlement for the telephone subscriber.

Description

The anti-device of usurping of phone

The utility model relates to a kind of preventing at the anti-device of usurping of the phone of telephone subscriber's outside line phone combined with other handset and illegally used.

At present, some unruly people telephone subscriber's outside line extension telephone machine free call on somebody else's expense through illegal means of being everlasting makes the telephone subscriber suffer economic loss, for this reason, people are seeking to prevent the method for this improper behavior always, and common way is the anti-device of usurping of having a telephone installed before subscriber computer.Phone commonly used at present prevents that usurping device has two kinds, a kind of is as the people during at subset front end phone combined with other handset and illegally used, burglar alarm is just to free call on sb. else's expense through illegal means machine dispensing audio disturbances, (see " electronic production " 1996 the 8th phases publish), this method has 2 deficiencies: the one, and this audio disturbances can not influence free call on sb. else's expense through illegal means machine operate as normal, stealing the hitter can get through in the same old way and want to make a call, back drop is littler than speech, the robber hitter can ignore this noise and continue to commit theft, and eavesdrops the program of automatic sound information platform to follow one's bent especially; The 2nd, be used for to the sound and light signal of master alarm too faint, be difficult to cause owner's attention, moreover because of learning the free call on sb. else's expense through illegal means place, even do not had much meanings by free call on sb. else's expense through illegal means so owner knows phone yet, therefore, this phone burglar alarm can not prevent effectively that subscriber phone is stolen, and commercially available phone burglar alarm mainly is that this is a kind of at present.Another kind of phone prevents that usurping device is to send into locking pulse to the free call on sb. else's expense through illegal means machine, with its blockade, the robber hitter can not be got through, (see " electronic production " 1997 the 10th phases publish), this device also has 2 deficiencies: the one, make its complex structure with a relay and four batteries, and volume and weight all increases greatly, manufacturing cost also increases, the 2nd, the user should be equipped with battery, increases extra expenses, often notes changing battery again, increase trouble, use inconvenience.Therefore, this phone prevents that usurping device is difficult to apply.

The purpose of this utility model is exactly at the problems referred to above and actual needs, provides a kind of volume little, in light weight, simple in structure, cheap, and can bottle up that the phone of free call on sb. else's expense through illegal means phone is anti-usurps device, and it can prevent effectively that subscriber phone is stolen.

The purpose of this utility model is achieved in that establishes input port and output port on insulation crust, shell built-in circuit plate, its circuit is that the input utmost point of bridge rectifier (Q1) connects input port, connects voltage detecting network, oscillating circuit and amplifier tube successively between the output both positive and negative polarity; An input utmost point of bridge rectifier (Q2) connects a utmost point of input port, (Q2) another input utmost point connects a utmost point of output port, another of output port extremely directly extremely links to each other with another of input port, connects the current detecting network between the output both positive and negative polarity of bridge rectifier (Q2); The output of current detecting network and voltage detecting network all links to each other with the input of oscillating circuit, the output of oscillating circuit links to each other with the base stage of amplifier tube by resistance, and the collector and emitter of amplifier tube is connected on respectively between the output both positive and negative polarity of bridge rectifier (Q1).During use, input port is connect house lead in, output port connects subsets, no free call on sb. else's expense through illegal means phone and fashionable in outside line, its oscillating circuit is not worked, the utility model just provides a path to subscriber computer, when incorporating the free call on sb. else's expense through illegal means phone in the outside line into and usurp, voltage detecting network and current detecting network can in time detect this situation and make the oscillating circuit starting of oscillation, after the locking pulse amplification of amplifier tube with oscillating circuit output, send into the free call on sb. else's expense through illegal means phone, it is shut, can not get any phone to guarantee the free call on sb. else's expense through illegal means phone.

The utility model is without battery and relay, thereby volume is little, in light weight, simple in structure, cheap, esy to use, safe and reliable; Because of inside does not have consumable accessory, and its operating voltage and operating current are all less, so long service life; The telephone set that it can bottle up appropriator does not use phone and do not influence the telephone subscriber, and telecommunication equipment is not had any adverse effect yet, and through online practicality over one year, effect is very desirable.Because of thoroughly having removed telephone subscriber's trouble and worry,, have extremely strong application value and huge social benefit and economic benefit so help the sound development of telecommunications industry.

Below in conjunction with accompanying drawing the structure of the present utility model and the course of work are elaborated.

Fig. 1 is an external structure of the present utility model,

Fig. 2 is circuit theory diagrams of the present utility model.

1. shells, 2. input ports, 3. output ports, 4. circuit board Q1, Q2. bridge rectifier D1, D2, D3, D4, D5, D6, D7. diode C. electric capacity R1, R2, R3, R4, R5, R6. resistance OSC. oscillating circuit T. amplifier tube among the figure

By Fig. 1, shown in Figure 2, structure of the present utility model is: input port (2) and output port (3) are arranged on the shell (1), and shell built-in circuit plate (4), circuit board (4) is gone up dress circuit and element.Said circuit is: the two input utmost points of bridge rectifier (Q1) connect input port of the present utility model (2), the indirect voltage detecting network of its output both positive and negative polarity, oscillating circuit and amplifier tube.The connection of voltage detecting network is: the positive pole of diode (D1), (D4) connects the output cathode of bridge rectifier, the negative pole of diode (D1) connects the positive pole of diode (D2) and an end of electric capacity (C), the negative pole of diode (D2) connects the negative pole of diode (D3), (D4), one end of the anodal connecting resistance of diode (D3) (R1), other end connecting resistance (R2) end of resistance (R1) and (1) pin of oscillating circuit (OSC), the output negative pole of another termination bridge rectifier (Q1) of the other end of resistance (R2) and electric capacity (C); The connection of oscillating circuit is the output cathode of a termination bridge rectifier (Q1) of resistance (R3), (8) pin of another termination oscillating circuit (OSC), the positive pole of one end of resistance (R4) and diode (D5) connects the negative pole of diode (D1), (5) pin of another termination oscillating circuit (OSC) of resistance (R4), the negative pole of diode (D5) connects (6) pin of oscillating circuit (OSC), (4) pin of oscillating circuit (OSC) connects the output negative pole of bridge rectifier (Q1), (7) pin connects the base stage of amplifier tube (T) and an end of resistance (R6), the output negative pole of another termination bridge rectifier (Q1) of resistance (R6) through resistance (R5); The collector electrode of amplifier tube connects the output cathode of bridge rectifier (Q1), and emitter connects the output negative pole of bridge rectifier (Q1).The connection of current detecting network is that the two input utmost points of bridge rectifier (Q2) connect a utmost point of input port (2) and a utmost point of output port (3) respectively, another of another utmost point of input port (2) and output port (3) extremely directly links to each other, the output cathode of bridge rectifier (Q2) connects (2) pin of oscillating circuit (OSC) and the positive pole of diode (D6), the negative pole of diode (D6) connects the positive pole of diode (D7), and the output negative pole of bridge rectifier (Q2) connects (3) pin of oscillating circuit (OSC) and the negative pole of diode (D7).

Now the concrete course of work of the present utility model is described in conjunction with Fig. 2:

As shown in Figure 2, the utility model has an input port (2) and an output port (3), during use input port (2) is connect outside line, output port (3) connects subsets, when no telephone set is worked on the telephone wire, 48 volts of standby voltages that switch is sent here through outside line through bridge rectifier (Q1) with the diode in the voltage detecting network (D3) reverse breakdown, obtain (1) pin that a high level enters oscillating circuit (OSC) in resistance (R2) upper end, forbid oscillating circuit (OSC) vibration, (7) pin output low level of oscillating circuit (OSC) is ended amplifier tube (T), and the utility model is operated in monitored state.When the subsets of port (3) connection are proposed the machine use, electric current in the subsets flows into (2) pin of oscillating circuit (OSC) through the current detecting network, oscillating circuit (OSC) still is under an embargo and can not starting of oscillation, still remain off and no pulse output of amplifier tube (T), the user can normally use phone.When being arranged on the telephone wire of the utility model front, incorporates into and the machine of carrying when usurping by telephone set, input port (2) two interpolar voltages of the present utility model drop to 6 volts, this voltage can not be with diode (D3) reverse breakdown, resistance (R2) upper end obtains (1) pin that a low level enters oscillating circuit (OSC), simultaneously, not carried machine because of subsets uses, (2) pin no current of oscillating circuit (OSC) flows into, at this moment, (1) pin of oscillating circuit (OSC) is that low level and (2) pin no current flow into these two conditions and satisfy simultaneously, oscillating circuit (OSC) is oscillatory work just, oscillating impulse is from its (7) pin output warp (R5), (R6) be added to the base stage of amplifier tube (T) after the dividing potential drop, amplifier tube is exported powerful pulse and is entered outside line, blocks the telephone set of appropriator, makes it can not get through any phone.After appropriator was torn machine open, input port (2) recovered 48 volts of voltages again, and oscillating circuit (OSC) is the high level failure of oscillation because of its (1) pin again, and the utility model enters monitored state again.

Volume of the present utility model is less, it can be contained in the telephone set, as a conventional device in the telephone set, before also it can being contained in the existing telephone machine separately, the terminal box that replaces the telephone set front end, no matter be contained in the machine or machine before, its effect that prevents to usurp in the outside line parallel operation phone is all very desirable.

Claims

1, a kind of preventing at the anti-device of usurping of the phone of telephone subscriber's outside line phone combined with other handset and illegally used, input port and output port are arranged on insulation crust, shell built-in circuit plate, it is characterized in that said circuit is: the input utmost point of bridge rectifier (Q1) connects input port, connects voltage detecting network, oscillating circuit and amplifier tube successively between the output both positive and negative polarity; An input utmost point of bridge rectifier (Q2) connects a utmost point of input port, (Q2) another input utmost point connects a utmost point of output port, another of output port extremely directly extremely links to each other with another of input port, connects the current detecting network between the output both positive and negative polarity of bridge rectifier (Q2); The output of current detecting network and voltage detecting network all links to each other with the input of oscillating circuit, the output of oscillating circuit links to each other with the base stage of amplifier tube by resistance, and the collector and emitter of amplifier tube is connected on respectively between the output both positive and negative polarity of bridge rectifier (Q1).

2, the anti-device of usurping of phone according to claim 1, it is characterized in that said voltage detecting network is: diode (D1), (D4) positive pole connects the output cathode of bridge rectifier (Q1), the negative pole of diode (D1) connects the positive pole of diode (D2) and an end of electric capacity (C), the negative pole of diode (D2) connects diode (D3), (D4) negative pole, one end of the anodal connecting resistance of diode (D3) (R1), one end of the other end connecting resistance (R2) of resistance (R1) and (1) pin of oscillating circuit (OSC), the output negative pole of another termination bridge rectifier (Q1) of the other end of resistance (R2) and electric capacity (C).

3, the anti-device of usurping of phone according to claim 1, it is characterized in that said current detecting network is: the two input utmost points of bridge rectifier (Q2) connect a utmost point of input port (2) and a utmost point of output port (3) respectively, another of another utmost point of input port (2) and output port (3) extremely directly links to each other, the output cathode of bridge rectifier (Q2) connects (2) pin of oscillating circuit (OSC) and the positive pole of diode (D6), the negative pole of diode (D6) connects the positive pole of diode (D7), and the output negative pole of bridge rectifier (Q2) connects (3) pin of oscillating circuit (OSC) and the negative pole of diode (D7).