CN2137844Y - Adapter for four telephones with common line - Google Patents

Abstract

The utility model relates to an adapter for four telephones with common line, which is a small telephone switching device which has the advantages of reliable use, simple structure and low cost. The utility model adopts a photoelectric isolation circuit and a line automatic locking, driving, ringing and indicating circuit, the safety of callers and telephone networks are guaranteed, the performance of the adapter is enhanced, and the utility model can not affect telephone network load and also perform the function of secrecy for calling. When the power supply of the adapter is cut off, outside connections is still communicated with a duty telephone, and smooth line is guaranteed.

Description

Adapter for four telephones with common line

The utility model relates to the manufacturing technology of call forwarding equipment

Deep development along with reform, opening, many a kind of babyphone interconnecting devicies that improve the telephone line utilization rate of customer requirements, use the interconnecting device of two kinds of phones at present, one is artificial adapter, and its call forwarding work is all operated by full-time telephone operator; Its two, be the automatic telephone interconnecting device, though it need not full-time operator, usually outside line can't insert the extension set of wanting automatically, many extension set while rings cause misconnection often.

The purpose of this utility model is to make simple, the compact conformation, with low cost, easy to use of a kind of circuit, does not influence the four call gate adapters that telephone network total load situation can improve the subscriber phone utilization rate again.

The utility model is to constitute like this: adopt photoelectric isolating circuit to make the utility model working power and phone network realize electric the isolation; Guarantee when transferring, to give outside line and " dummy load " that is equivalent to a telephone set load with the External Call holding circuit, outside line is interrupted, during as the External Call extension set, press corresponding button on the extension set transfer button machine of can putting down the telephone by the working telephone receiver, then seal the ringing circuit and the extension set startup indicating circuit of other extension set and this extension set of connection by self-locking and relay drive circuit, after extension set started, " dummy load " that discharge 300 Ω at once made the unlikely broken string of outside line.When extension set make good use of hang up after, enter state on duty again, can allow this moment all extension sets to use outside lines again.When the main frame personnel go out, adopt initialization circuit on duty to set working telephone.This adapter adopts external power source to power.

Advantage of the present utility model is:

1, adopts photoelectric isolating circuit that working power of the present utility model and outside line net are isolated all the time, guaranteed the safety of telephone user and phone network.

2, adopt main three secondary telephone sets, the usefulness of taking the lead earlier, but equal direct outward dialings, wherein one in usefulness, other each all cut off automatically, what both guaranteed to converse is secret, does not increase the load of phone network again.

3, during the passive cut-out of the utility model working power, main frame still is connected unimpeded with the outside line net, can not influence work.

4, the utility model circuit is simple, and is with low cost, and attaching is very convenient, easy to utilize with use.

Accompanying drawing is an example of the present utility model, in conjunction with the accompanying drawings the utility model is described in detail:

Fig. 1, the utility model schematic diagram;

Fig. 2, the utility model fundamental diagram;

Fig. 3, the utility model circuitry figure;

Fig. 4, photoelectric isolating circuit figure.

Among Fig. 1, extension set change over switch K ₂1, mains switch K ₁2, power supply indicator LED ₁3, button QA is eliminated in ring ₄4, ringing pilot lamp LED ₂5, one fens power ringing button QA ₁6, one extension set relay indicating light LED ₃7, two fens power ringing button QA ₂8, two extension set relay indicating light LED ₄9, three fens power ringing button QA ₃10, three extension set relay indicating light LED ₅11.

Fig. 2, this adapter adopts the external power source mode, and external power source offers each functional circuit in the adapter behind power circuit 16, and when external power source interrupted, the outside line phone network was still unimpeded with main frame.Outside line enters the call forwarding device through outer wiring connector 17, photoelectric isolating circuit 12, working power and outside line phone network kept apart make outside line phone network and working telephone initialization circuit 13 unimpeded, the circuit self-locking, driving, ring, indicating circuit 14 adopts the outside lines conversation to take the lead earlier with principle to main frame with certain extension set seals automatically or startup work, when main frame or the use outside line earlier of a certain extension set, three extension sets or main frame and in addition two extension sets be closed interruption with being communicated with of outside line, finish when using, the phone that is closed after the on-hook is communicated with recovery with outside line.External Call holding circuit 15 is in the requirement of main frame according to External Call, press certain extension set button, indicator light is glittering and on-hook the time, " dummy load " that connect one 300 Ω to outside line do not make outside line interrupt on the one hand, start on the other hand circuit self-locking, driving, ring, indicating circuit 14 connect certain etc. extension set and seal other telephone sets, when when this extension set begins to converse, External Call holding circuit 15 promptly removes automatically.This extension set is with after finishing on-hook, and this adapter is got back to state on duty again.When the personnel of machine hall go out, set an extension set as working telephone by working telephone initialization circuit 13, notify from a phone call according to External Call.

In the utility model circuit:

Photoelectric isolating circuit 12 is by diode D ₁₀, D ₁₁, D ₁₂, D ₁₃, D ₁₆, resistance R ₈, R ₉, R ₁₀, capacitor C ₆And ic chip ₅Constitute.

Initialization circuit 13 on duty is by extension set change over switch K ₂1 forms.

Self-locking, driving, ring, indicating circuit 14 are by IC ₁, 1/2 IC ₂, 1/2 IC ₃, and peripheral cell constitute, wherein, resistance R ₂₇, R ₃₁, R ₃₅, R ₁₈With one fen power ringing button QA ₁6, two fens power ringing button QA ₂8, three fens power ringing button QA ₃10 form electronic switch manually boots element; D ₂₆, D ₂₉, D ₃₀Form and pay the power ringing starting component; D ₂₅, D ₂₈, D ₁₇, D ₃₁For feeding back from locking element; R ₂₅, R ₂₉, R ₃₃For paying organic electronic switch input terminal voltage sample resistance, capacitor C ₇, C ₈, C ₉Form the absorption circuit,, prevent the electronic switch misoperation to eliminate the interference on the circuit; Resistance R ₂₈, R ₃₂, R ₃₆With an extension set relay indicating light LED ₃7, two extension set relay indicating light LED ₄9, three extension set relay indicating light LED ₅11 form secondary machine work indication; Diode D ₆, D ₇, D ₈Play buffer action.Diode D ₂₆, D ₂₉, D ₃₂And resistance R ₁₈Form switching and ring starting component, 1/2 IC ₃Form ring electronics self-lock switch; Diode D ₂₀, resistance R ₁₄For reaction type from locking element; Capacitor C ₁₁As anti-interference element, resistance R ₇Be the ringing-current sampling resistor; Resistance D ₉, D ₁₆, capacitor C ₁₂Be the back voltage lock stream of sampling, filter circuit; Triode Q ₆, resistance R ₁₅It is the ring element that automatically resets; Button QA is eliminated in ring ₄4, diode D ₂₁, D ₂₂Be the hand-reset element; Diode D ₁₄, D ₁₅Resistance R ₅, R ₆, capacitor C ₄, ic chip ₄, relay J ₄Form the interrupted ringing circuit; Resistance R ₇, ringing pilot lamp LED ₂5 are the ring indication.

External Call holding circuit 15 is by triode Q ₇, relay J ₅, resistance R ₁₉, R ₃(300 Ω " dummy load ") constitutes.

Power circuit 16 is by mains switch K ₁2, power supply indicator LED ₁3, transformer B and diode D ₁, D ₂, D ₃, D ₄The ballast filter element, resistance R ₁, R ₂, capacitor C ₁, C ₁₄, CW and Ic constitute.Ringing voltage～50V wherein, relay working voltage～16V, circuit voltage～16V.

During the utility model work:

1, secondary machine is got an outside line:

Behind the off-hook, Q ₄Output current is through J _1-1Normally-closed contact is by phone J _1-2Normally-closed contact and D ₆, again at R ₂₅ Last generation 8～10VDC voltage, then IC ₂12 pin are " 1 ", IC ₂11 pin are " 0 ", IC ₂3 pin are " 1 ", IC ₂11 pin are " 0 ", IC ₂3 pin are " 1 ", Q ₁Conducting, J ₁, J ₀Adhesive.D ₂₅, D ₂₇Output " 1 ", about 20ms, J ₀, J ₁The contact displacement, secondary machine is connected trunk line, and the electric current that produces in trunk line is through IC ₅Coupling is at R ₈Last generation control voltage " 1 " is through isolating diode D ₁₆And R ₉Input IC ₂6 pin, IC at this moment ₂4 pin are " 0 ", IC ₂10 pin constant (" 1 ").In addition, D ₂₅Output " 1 " back instantaneous feedback is with electronic switch self-locking, D ₂₇Defeated " 1 " is after R ₁₁, C ₁₀After postponing 50ms, IC ₂8 pin become " 1 ", IC ₂10 pin still constant (" 1 ").At R ₈The voltage of last generation also has one the tunnel to be input to IC ₃2 pin, then IC ₃3 pin are " 0 ", Q ₅, Q ₄End Q ₄The no-output electric current.(annotate: reset condition refers to that main frame leads directly to outside line.J ₀After the work, be cut off between main frame and the outside line).After the secondary machine on-hook, electric current is " 0 " in the interruption, then sensing IC ₅Output and R ₈On voltage be " 0 ", through R ₉, R ₁₀, C ₆After postponing 3S, IC ₂4 pin are " 1 ".Since above-mentioned operating state, IC ₂8 pin become " 1 ", so IC ₂10 pin are reversed to " 0 ", i.e. IC ₂13 pin are " 0 ", and electronic switch discharges, IC ₂3 pin are " 0 ", Q ₁End J ₀, J ₁Discharge, circuit working recovers reset condition.R ₁₃, C ₁₀After postponing 50ms, IC ₂10 pin are " 1 ", again through R ₁₂, C ₅Postpone 50ms, IC ₂13 pin are " 1 ", and circuit is a reset condition.

2, adapter is advanced in outside line

Because main frame passes through J ₀Normally-closed contact leads directly to outside line, thereby has only the main frame ring.Its ringing current is through IC ₅Be coupled to R ₈Produce voltage, make IC ₃2 pin are " 1 ", IC ₃3 pin are " 0 ", Q ₅End Q ₄No-output, other secondary machine can not advance outside line.

3, main frame changes other secondary machine with the External Call phone

Press QA ₁, the one tunnel makes IC ₂1 pin is " 0 ", IC ₃3 pin are " 1 ", other Principle of Process such as above-mentioned 1.Another road is through D ₂₆Make IC ₃8 pin are " 0 ", IC ₃10 pin are " 1 ", pass through D ₂₀IC ₃12 pin are " 1 ", electronic switch starting, Q ₇Conducting, J ₅Adhesive, R ₃Insert trunk line, simultaneously IC ₄4 pin are " 1 ", IC ₄Vibration, Q ₈Interrupted conducting, J ₄Discontinuous operation, secondary machine is heard interrupted ringing, the ringing pilot lamp (LED that periodically glimmers ₂).

Behind secondary machine off-hook, its ringing current increases, and this amount is passed through R ₁₇After the check, through D ₉, R ₁₆, C ₁₂Filtering makes ₆, C ₁₂Filtering makes Q ₆Conducting, IC ₃13 pin become " 0 ", IC ₃9,11 pin are " 1 ", IC ₃10,12 pin are " 0 ", Q ₇End J ₅Discharge R ₃Reset, simultaneously, IC ₄4 pin are " 0 ", IC ₄Failure of oscillation, Q ₈End J ₄Discharge LED ₂Extinguish the direct normal talking of secondary machine and outside line.

5, manual ringing is eliminated

Press QA _4.IC313 pin are " 0 ", IC ₃11,9 pin are " 1 ", IC ₃10,12 pin are " 0 ", Q ₇End, discharge IC ₄4 pin are " 0 ", IC ₄Failure of oscillation, Q ₈End J ₄Discharge.While IC ₂13 pin are " 0 ", then IC ₂11,2 pin are " 1 ", IC ₂3 pin are " 0 ", Q ₁End J ₀, J ₁Discharge, main frame is conversed with outside line once again, recovers reset condition.

Claims (1)

1, a kind of four party-line adapters comprise extension set change over switch K ₂(1), mains switch K ₁(2), power supply indicator LED ₁(3), button QA is eliminated in ring ₄(4), ringing pilot lamp LED ₂(5), one fen power ringing button QA ₁(5), one fen power ringing button QA ₁(6), an extension set relay indicating light LED ₃(7), two fens power ringing button QA ₂(8), two extension set relay indicating light LED ₄(9), three fens power ringing button QA ₃(10), three extension set relay indicating light LED ₅(11), photoelectric isolating circuit 12, working telephone initialization circuit (13), circuit self-locking, driving, ring, indicating circuit (14), External Call holding circuit (15), power circuit (16), outer wiring connector (17) is characterized in that by diode D ₁₀, D ₁₁, D ₁₂, D ₁₃, D ₁₆, resistance R ₈, R ₉, R ₁₀, capacitor C ₆₁And ic chip ₅, the photoelectric isolating circuit of formation (12) is kept apart adapter internal work power supply and outside line phone network; The self-locking of employing extension set pushbutton enable circuit, driving, ring, indicating circuit (14) and External Call maintenance phone (15) are eliminated the interference between each phone and are prevented the interruption of outside line.

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