CN2448015Y

CN2448015Y - Automatic ringing-off device of telephone set

Info

Publication number: CN2448015Y
Application number: CN 00241018
Authority: CN
Inventors: 张怀治
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-13
Filing date: 2000-11-13
Publication date: 2001-09-12
Anticipated expiration: 2010-11-13

Abstract

The utility model relates to an automatic ringing-off device of a telephone set, which comprises a busy tone signal identification, an automatic on-hook, a reset, an electronic switching circuit and a power supply. The utility model is characterized in that the busy tone signal identification is composed of a sequential connection of a frequency selection circuit, an oscillation circuit and a threshold circuit; the automatic on-hook is composed of a drive, an incoming call prompt ringer and a bistable relay, wherein the drive is composed of a transistor; the reset is mainly composed of a switch and a transistor. The utility model can accurately discriminate a ringing off signal and ring again automatically when a telephone set in on-hook state losses any ring. The utility model has the characteristics that the circuit design of the utility model is artful and has strong practicability; the technical proposals of the oscillation circuit, the threshold circuit and the electronic switching circuit are characteristic. The utility model can be singly used by being matched with a common dual audio telephone set. The utility model can not influence the original functions of a telephone set, the telephone set is not needed to be changed and the work state of a circuit is not needed to be changed either. The utility model has the advantage of reducing the load of a switchboard of a telecommunication department. The utility model can work for a long time by electric supply of a battery.

Description

Telephone set loses hangs Automatic ringing-off device

The utility model relates to a kind of electronics hand-up device of phone, is specifically related to the electronics of a kind of dual tone phone when not hanging up properly and mends to mount automatically and put.

When making a phone call, a called side is often taken place, and the line is busy, sends busy tone, the phenomenon that can not get through.If this situation continues several hrs, can conclude tentatively that then this phone does not hang up properly (can not get rid of line short, electric leakage certainly and cause off-hook illusion).Phone does not hang up properly the problem that is to use, and the number of outside is not advanced, if this machine is the calling party before on-hook, telecommunication bureau also will continue metered.In the daily life, this phenomenon is very common, not only causes economic loss, makes troubles to the telephone subscriber, and increased unnecessary burden to public telephone network.In the prior art, present most of telephone sets are all with nowhere to turn to alert function, and minority has the also just phone on-hook prompting of telephone set of alarm function.This undoubtedly device can remind the telephone subscriber to correct on-hook, but the phenomenon that phone does not hang up properly in the practice still may exist.Chinese patent CN2303409Y announced one piece on January 6th, 1999, and the patent No. is 97236249.5, and name is called the utility model patent of " telephone automatic alarm hand-up device ".Its circuit is mainly formed by speech testing circuit, time-delay and reset circuit, warning circuit and automatic hand-up combination of circuits.Though this device can be realized automatic hand-up when warning is invalid, be only applicable to carry the phone of telephone switch circuit, and also not high to the accuracy of busy-back signal identification.

The utility model purpose provides a kind of when phone on-hook mistake extension takes place, and the automatic benefit that can accurately differentiate mistake extension signal and highly versatile mounts puts.

For achieving the above object, the technical solution adopted in the utility model is: a kind of telephone set loses hangs Automatic ringing-off device, comprise the busy-back signal identification circuit, automatic hand-up circuit and reset circuit, it is characterized in that: the busy-back signal identification circuit is by frequency selection circuit, oscillating circuit and the threshold circuit formation that is linked in sequence, frequency selection circuit mainly is made of the decoder that detects the 450HZ busy-back signal, its input is in parallel with telephone line, output is through inverter, electric capacity, resistance, inverter connects oscillating circuit after forming, oscillating circuit is made of astatic multivibrator, its output connects threshold circuit through inverter, threshold circuit by adjustable resistance with constitute with capacitances in series again after diode is in parallel, electric capacity is received inverter, and signal is exported by inverter; The automatic hand-up circuit is made up of drive circuit, incoming call prompting ringing circuit and bistable relay, drive circuit is made of triode, base stage is that input is connected with the threshold circuit output, drive circuit control bistable relay, bistable relay is connected in the telephone line loop, makes the telephone line maintenance be communicated with two kinds of operating states with telephone set or incoming call prompting ringing circuit; Reset circuit mainly is made of switch and triode, and switch is pressed once, and bistable relay just overturns and resets once.

In the technique scheme, the electronic switching circuit that also comprises a direct current power supply and control DC power supply break-make, electronic switching circuit is is mainly connected and composed by change poles circuit, bleeder circuit, inverter, triode, the change poles circuit is formed bridge by 4 diodes, input is in parallel with telephone line, output is connected on the bleeder circuit, bleeder circuit is made of 2 resistance series connection at least, the branch pressure side is an output, and be connected on through inverter, isolating diode on the base stage of triode, the collector electrode of triode, emitter, DC power supply constitute the loop of Switching Power Supply.

In the technique scheme, described reset circuit can also comprise triode and resistance, and the collector electrode of triode connects the transistor collector of drive circuit, base stage with connect positive source, grounded emitter after resistance, switch are connected.

In the technique scheme, described bistable relay can be controlled by another relay, and this relay is controlled by drive circuit; After described control relay contact and the electric capacity combination, trigger action voltage is higher than the bistable relay of 1 times of supply voltage; Bistable relay is connected in the telephone line loop, makes the telephone line maintenance be communicated with two kinds of operating states with telephone set or incoming call prompting ringing circuit.

In the technique scheme, described incoming call prompting ringing circuit can be ringing circuit, also can be sound, light cue circuit.

Busy-back signal is a kind of 450HZ, logical 0.35 second, disconnected 0.35 second regular signal, and promptly the cycle is 0.7 second a discontinuous signal.Signal on the telephone wire has dialing sound, ring-back tone, busy tone to insert sound and conversation signal, and other signal has obvious difference on busy-back signal and the telephone wire, and therefore, it is practicable detecting busy-back signal from circuit.

The utility model operation principle is: when the normal on-hook of phone, when frequency selection circuit detects less than busy-back signal, the diode of control generator failure of oscillation or starting of oscillation ends, at this moment, the oscillating circuit generation cycle is 2 seconds self-oscillation, the output high level, it behind inverter low level, make electric capacity in the threshold circuit through the diode discharge zero clearing, output low level, low level are delivered to the drive circuit transistor base, and triode is ended, because no current passes through in the bistable relay, still keeps former operating state.When phone does not hang up properly after conversation, frequency selection circuit detects the busy-back signal of 450HZ, output low level, periodically conducting of diode, because the cycle is 0.7 second 2 seconds low-frequency oscillation of high frequency control, destroyed the starting condition for oscillation of LF self-oscillation, making output end of oscillating circuit is low level, it behind inverter high level, at this moment, the resistance in the passing threshold circuit charges to electric capacity, if charging process can be delayed time a period of time continuously (about 20 seconds), voltage on the electric capacity is raised to the threshold voltage of inverter upset, then be judged to be phone and lose extension, the threshold circuit output is a high level, and high level is delivered to the drive circuit transistor base, make the triode conducting, electric current flows through relay, and triggers the bistable relay upset, and (this moment, phone did not hang up properly as yet to cut off phone talk line connecting incoming call prompting simultaneously ringing circuit, but the talk line of phone has been cut and has been continued), to telephone network simulation hook state.When the outer end was thrown phone into, the incoming call prompting ringing circuit sent incoming call alerting signal (this signal can be ring, also can be acousto-optic combination etc.), at this moment, as long as just click reset switch and can pick up phone and converse.

The operation principle of electronic switching circuit is: the input of electronic switching circuit is in parallel with telephone line, because the cmos circuit input resistance is high, so do not influence telephone line operating state (measured current is 1 μ A only), during cmos circuit input termination high level, static working current minimum (actual measurement is zero).When the normal on-hook of phone, the about 50V of change poles circuit output, the about 6V of output is a high level after the bleeder circuit dividing potential drop, is low level behind inverter, triode is ended, thereby cut off the electricity supply.Behind off-hook, the output of change poles circuit is about 10V, and output is a low level after the bleeder circuit dividing potential drop, is high level behind inverter, makes the triode conducting, thus energized.

Because the technique scheme utilization, the utility model compared with prior art has following advantage:

1, because the utility model busy-back signal identification circuit is linked in sequence by frequency selection circuit, oscillating circuit and threshold circuit and constitutes, differentiate through input → gating → time-delay during the identification busy-back signal, effectively controlled the interference of other signal, identification accurately and reliably.

2, because the utility model oscillating circuit adopts the astatic multivibrator of lower frequency to constitute, threshold circuit by adjustable resistance with constitute with capacitances in series after diode is in parallel, the sort circuit design has utilized the busy-back signal control low-frequency oscillation of upper frequency dexterously, destroy low frequency astatic multivibrator starting condition for oscillation, making low frequency astatic multivibrator output is low level, after anti-phase, be the charging of threshold circuit electric capacity, and when the low frequency astatic multivibrator vibrates, constantly be electric capacity zero clearing (discharge).Has novelty and creativeness.

3, since the utility model threshold circuit by adjustable resistance with constitute with capacitances in series after diode is in parallel; can utilize same active device like this is the electric capacity charging and the two kinds of operating states of discharging with pull current and sink current respectively; and adopt different paths to carry out charge and discharge; and the charging interval is adjustable; but discharge time is extremely short; differentiate as the time-delay of busy-back signal to reach electric capacity when charging, normal or exclude the interference signal during capacitor discharge as differentiating on-hook.This technical conceive has much characteristic, therefore has tangible creativeness.

4, because the utility model has also designed the electronic switching circuit of a may command DC power supply break-make, this electronic switching circuit is cut off the electricity supply energized behind the closing of the circuit talk line when normal on-hook of phone or benefit extension.This set helps saving power autonomous, can work over a long time, and not increase too much burden to telephone network, and is during the utility model is applied, significant to safeguarding existing telephone network load balancing.

Accompanying drawing 1 is the utility model circuit block diagram;

Accompanying drawing 2 is the utility model embodiment one circuit diagram;

Accompanying drawing 3 is the electronic switching circuit figure of the utility model embodiment two;

Accompanying drawing 4 is the electronic switching circuit figure of the utility model embodiment three.

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: referring to accompanying drawing 1 and accompanying drawing 2, a kind of telephone set loses hangs Automatic ringing-off device, is made up of busy-back signal identification circuit, automatic hand-up circuit, reset circuit, electronic switching circuit and power supply.L1, L2 are that telephone wire inserts end.Power supply is the 6V DC power supply.

The busy-back signal identification circuit is linked in sequence by frequency selection circuit, oscillating circuit and threshold circuit and constitutes.Frequency selection circuit is made of the LM567 decoder IC3 and the peripheral cell that detect the 450HZ busy-back signal.Answer the call after decoder 3 ends orders series capacitance C2, the resistance R 3 L1 end of machine, 4 termination power positive poles, 8 ends are output, 4 ends and 8 end span connecting resistance R4,5 ends and 6 end spaies meet adjustable resistance RP1,1 end, 2 ends and 6 ends meet capacitor C 5, C6 and C4 respectively, merge series capacitance C3 with 7 ends then and are connected on the L2.8 ends one tunnel are through capacitor C 7 ground connection, and another road connects oscillating circuit through inverter ic 1-1, capacitor C 8, resistance R 5, inverter ic 2-1, diode VD9.This circuit reference potential connects electronic switch.

Oscillating circuit constitutes astatic multivibrator by inverter ic 2-2, IC2-3, adjustable resistance RP2 and capacitor C 12, its export one the tunnel through resistance R 8, light-emitting diode VD10 with indicating operating status, another road connects threshold circuit through inverter ic 2-4.This circuit reference potential connects electronic switch.Threshold circuit constitutes by connecting with capacitor C 16 after adjustable resistance RP3 and the diode VD11 parallel connection again, and C16 receives inverter ic 2-5, IC2-6, diode VD12 connects the automatic hand-up circuit.This circuit reference potential connects electronic switch.

The automatic hand-up circuit is made up of drive circuit, incoming call prompting ringing circuit and bistable relay.Drive circuit is made of triode VT2, capacitor C 17, and the base stage of triode VT2 is that input is connected with the threshold circuit output, strides capacitor C 17 between base stage and the emitter, and collector electrode connects positive source through bistable relay K1.This circuit reference potential connects electronic switch.

Described relay is 2, wherein one is control relay K1, be connected on the collector electrode of drive circuit triode, another is on-hook bistable relay K2, K1 has two groups of construction of switch K1-1 and K1-2, serial connection capacitor C 19 between two groups of contacts, the upset of K1 control K2, K2 is connected in the telephone line loop, makes the telephone line maintenance be communicated with two kinds of operating states with telephone set or incoming call prompting ringing circuit.

The incoming call prompting ringing circuit is a ringing circuit, is made of LS1240 ring integrated circuit (IC) 4 and peripheral cell.Reset circuit is made up of triode VT3, switch S B, resistance R 10, diode VD13 and capacitor C 20, the collector electrode of triode VT3 connects the collector electrode of the triode VT2 of drive circuit and succeeds electrical equipment K1 together, the base stage of triode VT3 connects positive source with diode VD13, resistance R 10, switch S B after connecting, cross-over connection capacitor C 18 between the collector electrode of triode VT3 and the positive source, grounded emitter, cross-over connection capacitor C 20 between emitter and the base stage.

Electronic switching circuit is is mainly connected and composed by change poles circuit, bleeder circuit, inverter ic 1-2, triode VT1.The change poles circuit is formed bridge by 4 diode VD1～4, input termination L1 and L2, output is connected on the bleeder circuit, bleeder circuit is made of voltage-stabiliser tube VD5, resistance R 1, resistance R 2 series connection, one end ground connection of resistance R 2, the other end is for dividing pressure side, divide pressure side cross-over connection capacitor C over the ground 1 and voltage-stabiliser tube VD6, the branch pressure side is connected on the base stage of triode VT1 through diode VD7, inverter ic 1-2, isolating diode VD8 as output, base stage connects capacitor C 9 over the ground, grounded emitter, collector electrode connect above-mentioned each " electronic switching circuit " incoming end respectively.

Present embodiment is test of many times, facts have proved to meet the object of the invention and effect fully.

Embodiment two: referring to accompanying drawing 3, a kind of telephone set loses hangs Automatic ringing-off device, is made up of busy-back signal identification circuit, automatic hand-up circuit, reset circuit, electronic switching circuit and power supply.L1, L2 are that telephone wire inserts end.Power supply is the 6V DC power supply.

Described electronic switching circuit is is mainly connected and composed by change poles circuit, bleeder circuit, triode V.The change poles circuit is formed bridge by 4 diodes, input termination L1 and L2, output is connected on the bleeder circuit, bleeder circuit is made of two resistance series connection, one of them resistance one end ground connection, the other end is for dividing pressure side, the base stage of dividing potential drop termination triode V, grounded collector, emitter connect and connect above-mentioned each " electronic switching circuit " incoming end respectively.Operation principle is: UA is a high level during on-hook, and V ends; During off-hook, UA is a low level, the V conducting.

Other circuit is identical with embodiment one.

Embodiment three: referring to accompanying drawing 4, a kind of telephone set loses hangs Automatic ringing-off device, is made up of busy-back signal identification circuit, automatic hand-up circuit, reset circuit, electronic switching circuit and power supply.L1, L2 are that telephone wire inserts end.Power supply is the 6V DC power supply.

Described electronic switching circuit mainly is made up of change poles circuit, triode V1, triode V2, diode D and two resistance, the change poles circuit is formed bridge by 4 diodes, input termination L1 and L2, output is connected on the anode of the emitter of triode V1 and diode D, the base stage of V1 is connected on the negative electrode of D and an end of telephone set by a resistance, the collector electrode of V1 is connected on the base stage of V2 by another resistance, the emitter and collector of V2 be connected on respectively with other circuit on, the other end ground connection of telephone set.Operation principle is: during on-hook, and D, V1, V2 ends; During off-hook, D, V1, V2 conducting.

Other circuit is identical with embodiment one.

Claims

1, a kind of telephone set loses hangs Automatic ringing-off device, comprise the busy-back signal identification circuit, automatic hand-up circuit and reset circuit, it is characterized in that: the busy-back signal identification circuit is by frequency selection circuit, oscillating circuit and the threshold circuit formation that is linked in sequence, frequency selection circuit mainly is made of the decoder that detects the 450HZ busy-back signal, its input is in parallel with telephone line, output is through inverter, electric capacity, resistance, inverter connects oscillating circuit after forming, oscillating circuit is made of astatic multivibrator, its output connects threshold circuit through inverter, threshold circuit by adjustable resistance with constitute with capacitances in series again after diode is in parallel, electric capacity is received inverter, and signal is exported by inverter;

The automatic hand-up circuit is made up of drive circuit, incoming call prompting ringing circuit and bistable relay, drive circuit is made of triode, base stage is that input is connected with the threshold circuit output, drive circuit control bistable relay, bistable relay is connected in the telephone line loop, makes the telephone line maintenance be communicated with two kinds of operating states with telephone set or incoming call prompting ringing circuit;

Reset circuit mainly is made of switch and triode, and the bistable relay upset is resetted.

2, Automatic ringing-off device according to claim 1, it is characterized in that: the electronic switching circuit that also comprises a direct current power supply and control DC power supply break-make, electronic switching circuit is mainly by the change poles circuit, bleeder circuit, inverter, triode connects and composes, the change poles circuit is formed bridge by 4 diodes, input is in parallel with telephone line, output is connected on the bleeder circuit, bleeder circuit is made of 2 resistance series connection at least, the branch pressure side is an output, and through inverter, isolating diode is connected on the base stage of triode, the collector electrode of triode, emitter, DC power supply constitutes the loop of Switching Power Supply.

3, Automatic ringing-off device according to claim 1 is characterized in that: described bistable relay can be controlled by another relay, and this relay is controlled by drive circuit; After described control relay contact and the electric capacity combination, trigger action voltage is higher than the bistable relay of 1 times of supply voltage; Bistable relay is connected in the telephone line loop, makes the telephone line maintenance be communicated with two kinds of operating states with telephone set or incoming call prompting ringing circuit.