CN2332120Y - Telephone protector without source, pole and consumption - Google Patents

Abstract

The utility model relates to a telephone protector without sources, poles and consumption, comprising a comparison amplifying trigger circuit, a switch circuit, a polarity change-over circuit, a timing reset circuit, an alarm circuit and a user off-hook sampling circuit. The telephone protector without sources, poles and consumption uses the static zero-current comparison amplifying trigger circuit and the sound-light alarm circuit which reduces the voltage and resistance. In the stand-by state, the telephone protector without sources, poles and consumption has no consumption and can effectively prevent the parallel operation to call stealingly. The normal use of the users is not influenced completely. The circuit is simple, practical and reliable.

Description

Passive electrodeless no power consumption words protector

The utility model is the electronic installation that a kind of phone protector promptly prevents from illegally to utilize user telephone line phone combined with other handset and illegally used.

At present, phone protector (or claiming Device for anti-fraudulent use telephone line) disclosed or postal and telecommunication entities' approval network access is various various.Can be divided into active and passive two classes by the power supply supply mode; Active class need provide power-supply device with the holding circuit operate as normal separately, and passive class is directly utilized local telephone network feed power supply.Can be divided into by connected mode the utmost point and electrodeless two classes are arranged with local network, there is utmost point class when inserting telephone network, need distinguish positive-negative polarity, when the telephone wire feeding electrode sexually revises, protector need change polarity simultaneously, electrodeless class does not need to distinguish positive-negative polarity when inserting telephone network, needn't consider the change of feeder line polarity yet.No matter that is a kind of, all there is a common shortcoming, be exactly need certain static working current during standby, therefore insert the leakage current that all can increase telephone terminal behind the telephone line." modern communication " magazine disclosed several phone protectors in 1997, and its quiescent current is at microampere～hundred microampere orders, and " electronics newspaper " the 38th phase in 1996 has been announced a kind of integrated chip Device for anti-fraudulent use telephone line, and its quiescent current is in μ A level.

It is zero passive electrodeless no power consumption words protector that the purpose of this utility model provides a kind of operating current of waiting for, technic relization scheme of the present utility model: a kind of passive electrodeless no power consumption words protector, comprise and relatively amplify circuits for triggering, switching circuit, polarity switching, time-delay reset circuit, warning circuit, user's off-hook sample circuit, its block diagram is an accompanying drawing 1, electrical schematic diagram is an accompanying drawing 2, below in conjunction with accompanying drawing 2 its formation characteristics of explanation.

1. relatively amplify circuits for triggering, by transistor Q ₁, Q ₂, diode D ₁, D ₂, capacitor C ₁, C ₂, resistance R ₁Form PNP transistor Q ₁With NPN transistor Q ₂The emitter inverse parallel connection after, base stage is through resistance R ₁Be connected with incoming line one end (A end), emitter is through capacitor C ₂Be connected transistor Q with the incoming line other end (B end) ₁, Q ₂Collector electrode respectively through diode D ₁, D ₂Trigger the swollen output of arteries and veins as positive and negative polarity, at Q ₁, Q ₂Emitter junction also be parallel with capacitor C ₁

2. switching circuit is by transistor Q ₃～Q ₇, diode D ₃, D ₄, capacitor C ₃, C ₄, resistance R ₂～R ₇Connect into the switching circuit of two kinds of polarity, Q ₃, Q ₄Constitute positive polarity switching circuit, Q Deng element ₅～Q ₇Constitute the negative polarity switching circuit, in the negative polarity switching circuit, Q ₇Collector electrode meet Q ₆Base stage, emitter passes through R ₃Connect reference point " ", base stage is kept voltage input end as the positive polarity of negative polarity switching circuit, Q ₆Base stage as negative polarity trigger impulse input, emitter connects incoming line B end and unlike Q in the positive polarity switching circuit ₄Emitter connect like that " ".

3. polarity switching is by diode D ₅～D ₁₀Form, be characterized in rectifier bridge D ₅～D ₈Interchange arm end respectively with switching circuit in Q ₃, Q ₅Collector electrode link to each other, and pass through D respectively ₉, D ₁₀Be connected D with incoming line B end ₉Positive pole connect B end, D ₁₀Negative pole connects the B end.

4. time-delay reset circuit is to adopt integrated " 555 " timing circuit IC ₁Together with resistance R ₉, R ₁₀, R ₁₁, capacitor C ₅, diode D ₁₁Constitute relaxation oscillator together as time-delay reset circuit, IC ₁Output 3. pin passes through R ₁₁, D ₁₁While and Q ₄, Q ₇Base stage links to each other and keeps conducting or shutoff with the control switch circuit.

5. warning circuit is by diode D ₁₂, luminous tube LED ₁, news Chinese percussion instrument B ₁Constitute step-down, fall resistance, audible and visual alarm circuit, diode D ₁₂With luminous tube LED ₁The series connection again with B ₁Be connected on polarity switching "+", "-" end after the parallel connection respectively.

6. user's off-hook sample circuit is diode D ₁₅, D ₁₆Be serially connected with behind the reverse parallel connection between substation circuit B, D and replace sample resistance, NPN transistor Q ₈With PNP transistor Q ₉Cross-over connection is in sampling diode two ends after the emitter inverse parallel connection, and collector electrode is respectively through diode D ₁₃, D ₁₄With capacitor C ₂Connect, thus when realizing user's off-hook to C ₂The function of discharge.

Accompanying drawing 1 is a block diagram of the present utility model.Accompanying drawing 2 is complete machine electrical schematic diagrams, among the figure, and Q ₁～Q ₉Be high back-pressure silicone tube, D ₁～D ₁₈Be 4148, C ₁10 μ f, C ₂1 μ f electrodeless electric capacity, C ₃, C ₄1000p, C ₅10 μ f, R1100k, R ₂, R ₄, R ₅, R ₇33k, R ₈, R ₆, R ₁₁, R ₁₂3k, R ₉1M Ω, R ₁₀, R ₁₃1k, R ₈10k

Below in conjunction with accompanying drawing 2 its courses of work are described: if A termination circuit anode;

Under normal condition, the circuit anode is through R ₁To C ₂Charge to feed voltage+48 volt, charge path is circuit anode → A → Q ₂Base stage → Q ₂Emitter → C ₂→ B → circuit negative terminal.After charging and charging end, Q ₁, Q ₂Voltage between base stage and emitter all equals 0.7 volt and 0 volt, Q ₁Instead end Q partially ₂Collector electrode is also because D ₂Buffer action and no current flows through.When the disabled user was combined with other handset and illegally used, the line scan pickup coil side voltage die was below 12 volts, capacitor C ₂Discharge, discharge path is C ₂→ Q ₁Emitter → Q ₁Base stage → R ₁→ A → circuit anode → feed source → circuit negative terminal → B → C ₂, visible discharging current is Q ₁Base current, when this electric current is enough big, Q ₁Conducting, C ₂Simultaneously through Q ₁Emitter, collector electrode D ₁, Q ₄Emitter junction, D ₇, D ₁₀Discharge forms the positive polarity trigger current and makes switching circuit Q ₄, Q ₃Conducting, at this moment, line power is through Q ₃, polarity switching D ₅, D ₇The back provides operating current to warning circuit and time-delay reset circuit, because D ₁₂, LED ₁Effect, both reduced the voltage of line scan pickup coil side, reduced the AC impedance of network again, make the normally dialing conversation of robber's machine, interrogate Chinese percussion instrument B simultaneously ₁With luminous tube LED ₁Audible and visual alarm.Time-delay reset circuit gets electric initial stage, IC ₁3. pin output high level is through R ₁₁, D ₁₁To Q ₄Provide base current to keep Q ₄, Q ₃Continue conducting, through certain hour, IC ₁3. the pin output low level is turn-offed switching circuit, and the feeder line terminal voltage raises, C ₂Again through R ₁, Q ₂Emitter junction charges to+and 48 volts, be in holding state.When user's off-hook, the phone electric current flows through D ₁₅, simultaneously through R ₁₃Flow through Q ₈Emitter junction, Q ₈Conducting, C ₂On electric charge through R ₁₂, D ₁₃, Q ₈, discharge, so circuits for triggering dead electricity and can not the trigger switch circuit turn-on does not influence user's normal dialing, conversation.C ₁Be anti-interference capacitor, the bell signal of toll-bypass call simultaneously makes it not influence circuit working.D ₁₅, D ₁₆Back in parallel replaces sample resistance, constitutes the bell signal path of substation on the one hand, makes sample circuit as far as possible little to the influence of substation on the one hand.

Suppose A termination circuit negative terminal, the course of work is similar to the front, is in this case, just often C ₂Fill with negative electrical charge, during work, replace the positive polarity circuit respectively by negative polarity circuits for triggering, switching circuit, sample circuit.In addition, the formation and the positive polarity of negative polarity switching circuit are slightly different, and operation principle is had any different slightly, and the path of trigger current is C ₂→ Q ₆Emitter → Q ₆Base stage → D ₂→ Q ₂Collector electrode → Q ₂Emitter → C ₂Keeping current paths is IC, 3. pin → D ₁₁→ Q ₇Base stage → Q ₇Emitter → R ₈→ " ".

Advantage:

1. owing to adopted foregoing static zero current relatively to amplify circuits for triggering, work as capacitor C₂Fill Behind the foot electricity, at holding state, no longer consume electric energy, the complete machine leakage current can be less than below 0.3 microampere, Therefore insert the leakage current that telephone network increases telephone terminal hardly, can be rated as lossless phone protector.

Because adopted foregoing step-down, fallen resistance, sound, light warning circuit, improved antitheft The reliability of beating.

3. owing to adopt the diode of two reverse parallel connections to replace user's off-hook sample resistance, user's off-hook is logical During words, direct current pressure drop and the AC impedance at diode two ends are all very little, therefore substation are normally made With there not being impact.

Claims (6)

1. A kind of passive electrodeless no power consumption words protector, its feature comprises:

   (1), relatively amplifies circuits for triggering, constitute by two triodes, two diodes, two capacitors, a resistance, base stage is connected with incoming line (A end) through resistance R 1 after the emitter inverse parallel connection of PNP transistor Q1 and Q2, emitter is connected with the incoming line other end (B end) through capacitor C2, collector electrode is respectively through diode D1, D2 is as positive and negative polarity trigger impulse output, and the emitter junction of Q1, Q2 also is parallel with capacitor C1.
2. (2), switching circuit, by triode Q3～Q7, diode D3, D4, capacitor C3, C4, resistance R 2～R7 connects into the switching circuit of two kinds of polarity, element such as Q3, Q4 constitutes the positive polarity switching circuit, Q5～Q7 constitutes the negative polarity switching circuit, the current input terminal of keeping of two kinds of switching circuits links together, in the negative polarity switching circuit, the collector electrode of Q7 connects the base stage of Q6, emitter by R8 connect reference point " ", the base stage of Q6 is as negative polarity trigger impulse input, emitter connect incoming line B end and unlike the positive polarity switching circuit, connect " ".
3. (3), polarity switching, rectifier bridge D5～D8 exchanges the arm end and links to each other with Q3, the collector electrode of Q5 in the switching circuit respectively, and holds with incoming line B by diode D9, D10 respectively and be connected.
4. (4), time-delay reset circuit, adopt integrated " 555 " timing circuit IC1 together with resistance R 9, R10, R11, capacitor C 5, diode D11 is connected into the relaxation oscillator form together as time-delay reset circuit, and IC1 output the 3rd pin is kept current input terminal with switching circuit simultaneously by R11, D11 and linked to each other.
5. (5), warning circuit, by diode D12, luminous tube LED1, news Chinese percussion instrument B1 constitutes step-down, falls resistance, sound, light warning circuit, diode D12 connects with luminous tube LED1 and is connected across polarity switching "+" again with after B1 is in parallel, "-" holds.
6. (6), user's off-hook sample circuit, be serially connected with behind diode D15, the D16 reverse parallel connection between phone circuit B, D and replace sample resistance, cross-over connection is in sampling diode two ends after NPN transistor Q8 and the parallel connection of PNP transistor Q9 emitter inverse, and collector electrode is connected with capacitor C 2 through diode D13, D14 respectively.

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