CN2249470Y - Domestic telephone switching device - Google Patents

Abstract

The utility model relates to a domestic telephone switching device with the function of one serving another. The utility model is composed of a power supply circuit, an internal line control circuit, a master user ringing circuit, an internal-external line switching circuit, a transferring music waiting circuit, an antijamming circuit and a protective circuit. External line direct dialing can be realized, when the power is cut off, extension sets of master and sub users can also dial the external line. The utility model has the function of internal line off-hook automatic calling, and the extension sets of the master users can also dial the external line; the extension sets of the sub users can call the master users so long as the operation of the extension sets of the sub users is in an internal line state no matter which state the extension sets of the master users are in. The extension sets of the master users can encrypt the talk of the external line and transfer the external line call to the extension sets of the sub users.

Description

The home telephone interchanger

The utility model is a kind of one with one home telephone interchanger.Be used to realize calling, conversation and switching between one tunnel outside line and two extensions.

The utility model is to belong to the electronic communication field, is used for the multiplexing equipment of telephone line.

Improvement forms the utility model on the basis of " the making ten house phones by oneself " of " household electrical appliance " 1985 the 5th phases " speakerphone " one literary composition and " household electrical appliance " o. 11th in 1993.The feed circuit of original text is simple, and output ripple is big, and the power supply impedance is little, can not be applicable to the all-electronin telephone set.In addition, circuit is not dialed functions such as outside line and the wait of outside line transfer music files in this article.

Purpose of design of the present utility model is in order to reduce the feed ripple, increases feed output impedance, increase subscriber's extension station and dial functions such as outside line and the wait of outside line transfer music files, but not only interior lines conversation but also can both dial outside line of the subscriber's extension station that makes two parallel connections.

The utility model adopts full-wave rectification, constant-current source feed; Increase main user's ringing circuit; Use key switch manual switching internal and external line operating state; Increase transfer music files and wait for circuit; Increase the anti-interference and protective circuit of circuit; At the two ends of main subscriber's extension relay (hereinafter to be referred as main relay) Km and secondary subscriber's extension relay (hereinafter to be referred as secondary relay) Ks coil, respectively and meet voltage stabilizing didoe VD ₉And VD ₁₀The technical scheme of shunting feed current.

Characteristics of the present utility model are that cost is low, function is many.Can realize internal call and conversation, speech quality is good, distance.The interior lines off-hook is called out automatically, need not dial.No matter which kind of operating state main subscriber's extension (hereinafter to be referred as main frame) is in, as long as secondary subscriber's extension (hereinafter to be referred as secondary machine) is operated in interior line states, secondary machine just can called host.But major and minor machine is direct outward dialing all.But main frame outside line conversation is maintained secrecy and is shifted External Call to secondary machine, and the transfer music files latency function is arranged.Also can realize Three-Way Calling.During power failure, but major and minor machine direct outward dialing still.

The utility model by power supply, interior line traffic control, main user's ring, internal and external line switch, transfer music files is waited for, circuit is anti-interference and protective circuit is formed.

Fig. 2 is the line map of the utility model home telephone interchanger.

Fig. 1 is the functional-block diagram of the circuit of Fig. 2.

Fig. 3 is application mode figure of the present utility model.

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Internal and external line commutation circuit of the present utility model is made up of main subscriber's extension selector switch (hereinafter to be referred as the main separation switch) Sm and secondary subscriber's extension selector switch (selecting switch hereinafter to be referred as pair) Ss.Main separation switch S m is a dpdt double-pole double-throw (DPDT) type key switch.Main frame is connected in the switches set Sm of main separation switch S m _-1Main frame M ₁End is after switching, respectively with outside line E ₁The Nm point of end, interior line control circuit connects, and realizes the internal and external line conversion of main frame.Secondary machine is connected in the secondary machine S that pair is selected switch S s ₁End is after switching, respectively with outside line E ₁End, circuit is anti-interference and the Ns of protective circuit point connects, and realizes that the internal and external line of secondary machine is changed.Other one group of switch S m of main separation switch S m _-2Line control circuit Nm point in being connected in is connected with the Wr point of main user's ringing circuit through switching after, and during line states, secondary machine is to the calling of main frame in external line state, secondary machine work in for the realization host work.

Transfer music files waits for that circuit is to shift maintained switch S by External Call _H(hereinafter to be referred as transfer switch), transfer indication light-emitting diode VD ₁₉, isolating transformer T ₂, resistance R ₉, R ₁₀, capacitor C ₁₃, voltage stabilizing didoe VD ₁₈And music circuit (1) is formed.Music circuit (1) can be music integrated circuit or language integrated circuit.Transfer switch S _HIt is double-pole single-throw (D.P.S.T.) type switch.Transfer switch S _HSwitches set S _H-1An end be connected in outside line E ₁End, the other end waits for that with transfer music files the C point of circuit is connected.Transfer switch S _HAnother the group S _H-2An end, wait for that with transfer music files the R point of circuit is connected, an other end respectively with the voltage stabilizing output point U of power supply circuits, interior line control circuit in the transfer contact Km of main relay Km _-1Moving chalaza and the transfer contact Ks of secondary relay K s _-1Moving chalaza a connect, realize that main frame waits for the transfer music files of the secondary machine of External Call.

Interior line control circuit by interior lines operating state control circuit and ring time control circuit form.Interior lines operating state control circuit is by main relay Km, secondary relay K s, diode VD ₇～VD ₁₀, resistance R ₃, R ₄, capacitor C ₆Form, realize the automatic conversion of interior lines operating state.Voltage stabilizing didoe VD ₉, VD ₁₀Effect be the shunting feed current, reduce the temperature rise of main relay Km and secondary relay K s, improve speech quality and distance.Resistance R ₃, capacitor C ₆Effect be to give off-hook call side with the ring confirmation signal.Resistance R ₄Play the ringing-current restriction.Diode VD ₇, VD ₈Be that ringing-current is scurried into main relay Km and secondary relay K s when preventing bell call, make their produce misoperation.The general square-wave generator that ring time, control circuit was made up of control relay ring time (hereinafter to be referred as the bell relay) Ka and other element, it makes the time interval action of bell relay K a by closed 1 second, release 4 paper money clocks, realizes the control of ring time.

Main user's ringing circuit is by capacitor C ₈, C ₉, resistance R ₅, diode VD ₁₁～VD ₁₆Form with bell sound circuit (2).Though its effect be host work in which kind of state, as long as secondary machine is operated in interior line states, secondary machine just can called host.Light-emitting diode VD ₁₅Be the ring indication.Bell sound circuit (2) can be phone ringing integrated circuit or active buzzer.

Anti-interference and the protective circuit of circuit is by inductance L ₁, capacitor C ₁₀Form with piezo-resistance RV.It is connected in pair and selects between the K point of switch S s and interior line control circuit, play a part to eliminate on the circuit high-frequency interferencing signal and anti-moment lightning impulse.

Power supply circuits are by triode V ₁, resistance R ₁, R ₂, diode VD ₅, VD ₆, capacitor C ₅The constant-current source of forming, integrated circuit (IC) ₁, capacitor C ₁～C ₄The voltage stabilizing circuit of forming, diode VD ₁～VD ₄, power transformer T ₁N ₁Full-wave rectifying circuit and power transformer T that winding is formed ₁Ringing-current winding N ₂Form.Divide three tunnel outputs, the first via is by the output of constant-current source V point, during the conversation of interior lines, through the make contact Km of main relay Km _-2Make contact Ks with secondary relay K s _-2To line fed; When do not work in interior lines, through the break contact Ka of bell relay K a _-1To line fed; During internal call, by the make contact Km of calling party user relay K m or Ks _-2Or Ks _-2To calling party telephone set feed; During callee's ring, not to callee's feeding DC.The second the tunnel is by the output of voltage stabilizing circuit U point, respectively through transfer switch S _HSwitches set SH _-2Wait for circuit supply and through the transfer contact Km of main relay Km or secondary relay K s to transfer music files _-1Or Ks _-1, to control circuit power supply ring time.Third Road is by power transformer T ₁N ₂The non-ground-end of winding, the inwardly resistance R of line control circuit ₄The output ringing current.

Outside line E ₂End, main frame M ₂End, secondary machine S ₂The common ground point that the end three links together and is connected to the utility model home telephone interchanger.

Sketch operation principle of the present utility model below in conjunction with use:

Under the normal operating position, the switches set Sm of main separation switch S m _-1Switch in outside line E ₁End, the switches set Sm of main separation switch S m _-2Switch in the Wr point of main user's ringing circuit; Pair selects switch S s to switch in the Ns point of the anti-interference and protective circuit of circuit; Transfer switch S _HBe arranged at off-state.When not using interior lines, main relay Km, secondary relay K s and bell relay K a are in release condition.

When External Call, main frame begins ring and secondary machine No ringing.Main user's off-hook can be conversed.If External Call is secondary machine, main user can be with transfer switch S _HPress outside line E ₁End and transfer music files wait for that the C point of circuit is communicated with light-emitting diode VD ₁₉Luminous.Transfer music files waits for that the R point of circuit and the U point of power supply circuits are communicated with, and music circuit (1) gets electric work, to outside line E ₁End outputting music signal, outside line E ₁End is in the music wait state.

At this moment main user presses main separation switch S m again, main frame M ₁End has obtained the V point by power supply circuits, through the break contact Ka of bell relay K a _-1, diode VD ₇, voltage stabilizing didoe VD ₉Feed.At this moment phone is equivalent to the D.C. resistance of a hundreds of ohm, makes main relay Km adhesive, the make contact Km of main relay Km _-2Closure keeps to main frame M ₁The end feed.Power supply circuits U point is through the transfer contact Km of main relay Km _-1Moving chalaza and the transfer contact Ks of secondary relay K s _-1Moving breakpoint, to control circuit power supply ring time.Ring time, control circuit was started working, bell relay K a according to 1 second of adhesive, discharge the rule action in 4 seconds.During ring, power transformer T ₁Ringing-current winding N ₂Non-ground-end through the make contact Ka of resistance 4, bell relay K a _-2, secondary relay K s transfer contact Ks _-3Moving breakpoint, the transfer contact Km of main relay Km _-3Moving chalaza and inductance L ₁To secondary machine S ₁End output ringing-current.This moment bell relay K a break contact ka _-1Disconnect not to secondary machine S ₁The end feeding DC, after ring stops again by power supply circuits V point, through the break contact Ka of bell relay K a _-1, diode VD ₈, voltage stabilizing didoe VD ₁₀And inductance L ₁To secondary machine S ₁The end feed.

If secondary user off-hook, secondary relay K s gets electric adhesive, the make contact Ks of secondary relay K s _-2Closure keeps to secondary machine S ₁The feed of end.The transfer contact Ks of secondary relay ks _-1Moving breakpoint disconnect, ring time, the control circuit dead electricity stopped ring, automatically changed the interior lines talking state over to.

If when secondary user agreed and outside line is conversed, main user can select pair switch S s to switch to outside line E ₁End.Again with transfer switch S _HM returns to original state with the main separation switch S, light-emitting diode VD ₁₉Extinguish, secondary user can converse with outside line.

During secondary user off-hook call master user, secondary relay K s gets electric adhesive, and ring time, control circuit got electric work, and ringing-current is through the switches set Sm of main separation switch S m _-2To the output of the Wr of main user's ringing circuit point, through capacitor C ₈And resistance R ₅, diode VD ₁₁～VD ₁₄, light-emitting diode VD ₁₅, bell sound circuit (2) gets electric work, sends the call bell sound.After main user hears, main separation switch S m is pressed and off-hook, main relay Km gets electric adhesive, and ring time, the control circuit dead electricity quit work, and both sides enter talking state.On-hook behind the talk-through, main relay Km and secondary relay K s discharge.

Fig. 3 a is the application mode of two telephone sets.

Fig. 3 b is the application mode of three telephone sets, and this kind mode can be simplified transfer operation.

Claims (4)

1. one kind one with one home telephone interchanger; comprise power supply circuits, interior line control circuit, internal and external line commutation circuit; it is characterized in that: main user's ringing circuit, interior line control circuit, transfer music files wait for that circuit and protective circuit anti-interference with circuit is connected with the internal and external line commutation circuit respectively, and interior line control circuit is connected with power supply circuits respectively with transfer music files wait circuit.

2. the home telephone interchanger of root a tree name claim 1 is characterized in that: transfer music files waits for that the C point in the circuit is by transfer switch S _HSwitches set S _H-1With outside line E ₁End connects; Transfer music files waits for that the R point in the circuit is by transfer switch S _HSwitches set S _H-2, respectively with the voltage stabilizing output point U of power supply circuits, interior line control circuit in the transfer contact Km of main relay Km _-1Moving chalaza and the transfer contact Ks of secondary relay K s _-1Moving chalaza a connect.Transfer music files waits for that the music circuit (1) in the circuit can be music integrated circuit or language integrated circuit.

3. the home telephone interchanger of root a tree name claim 1, it is characterized in that: the Wr point of main user's ringing circuit is the switches set Sm by main separation switch S m _-2Be connected with the Nm point of interior line control circuit.Bell sound circuit (2) in main user's ringing circuit can be phone ringing integrated circuit or active buzzer.

4. the home telephone interchanger of root a tree name claim 1, it is characterized in that: the Nm point of interior line control circuit is the switches set Sm by main separation switch S m _-1Be connected with main frame M1 end; The K point of interior line control circuit, the inductance L of the anti-interference and protective circuit of via line ₁, pair selects switch S s and secondary machine S ₁End connects; Resistance R in the interior line control circuit ₄An end and the power transformer T of power supply circuits ₁Ringing-current winding N ₂Non-ground-end connect.Main relay Km in the interior line control circuit and the coil two ends of secondary relay K s, respectively and be connected to voltage stabilizing didoe VD ₉, VD ₁₀The shunting feed current.

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