CN2206014Y

CN2206014Y - Telephone dialing limiter

Info

Publication number: CN2206014Y
Application number: CN 94242055
Authority: CN
Inventors: 孙波
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-06-16
Filing date: 1994-06-16
Publication date: 1995-08-23
Anticipated expiration: 2004-06-16

Abstract

The utility model relates to a telephone dialing limiter, which belongs to a telephone communication device. The utility model is characterized in that circuits comprises a microprocessor, a pulse signal detector and a switch circuit; a protection and ringing AC circuit is connected with an input terminal of the switch circuit; a pulse control switch circuit is respectively connected with two output terminals of the switch circuit after the pulse control switch circuit is connected with an external telephone set in series, two input ends of the pulse signal detector and two input ends of a power supply circuit in sequence to form three closed loop. Compared with the prior art, the utility model has the advantages that self power supply of the telephone system is adopted, the power consumption is less, the reliability is high, and the cost is low.

Description

Telephone dialing limiter

The utility model relates to a kind of telephone communication device.

The existing a kind of phone dialing limiter that uses; its circuit theory as shown in Figure 1; comprise DC power supply circuit 13, microprocessor 3 in the circuit; pulse signal detector 4, polarity protection device 12, switching circuit 6; dialing limiter is installed between telephone network switch 1 and the telephone set 2, comprises

relay

9,10, inverter 11 in the switching circuit.Its operation principle is as follows: power circuit joins in running order with external AC power supply all the time, when telephone set is under the hook state, relay closes, telephone set is communicated with outer circuit, behind the telephone set off-hook, relay is still closed, microprocessor starts starts working, the wait test signal arrives, in the telephone set dialing procedure, microprocessor testing result is deposited in and with database in number relatively, as the number that will limit group, control signal output ends F changes previous status immediately, relay is disconnected, and the attitude that restores to the original state after 1 second (promptly sending on-hook signal to telephone exchange) is as non-dail-limiting number, F holds the attitude of remaining stationary that relay is remained closed, and on-hook is waited in zero clearing simultaneously.Owing to adopted microprocessor, thereby good reliability, function are many in the above-mentioned dialing limiter circuit, but still have following weak point when reality is used: (1) use external AC power supply, and power consumption is big; (2) be subject to the influence of power supply network, meet power supply trouble and can cause just that telephone set can't use or lose the phone limit fully and dial function; (3) cost of goods manufactured is higher.

The purpose of this utility model just is to overcome above-mentioned weak point of the prior art, and a kind of phone dialing limiter that adopts telephone system self power supply, the little reliability height of power consumption and low cost of manufacture is provided.

The purpose of this utility model is achieved in that a kind of phone dialing limiter; comprise microprocessor ［ 3 ］ in the circuit; pulse signal detector ［ 4 ］; switching circuit ［ 6 ］; the control end of said switching circuit links to each other with the output of microprocessor ［ F ］; the output of said pulse signal detector links to each other with the input of microprocessor ［ P ］; the input of said switching circuit links to each other with an output of a protection and ring alternating current circuit ［ 5 ］; one pulse control switch circuit ［ 7 ］ with after extraneous telephone set ［ 2 ］ is connected respectively with two output ［ C of said switching circuit; D ］; two input ［ E of pulse signal detector; H ］ and two input ［ G of a power circuit ［ 8 ］; J ］ linking to each other constitutes three loops successively; the 3rd end of said pulse control switch circuit ［ 7 ］ links to each other with another output of said protection and ring alternating current circuit, and the output of said power circuit links to each other with the power input of microprocessor.

Below in conjunction with embodiment (accompanying drawing) the utility model is further described.

Fig. 1 is the schematic block circuit diagram of the phone dialing limiter that prior art provided;

Fig. 2 is the circuit block diagram in the utility model;

Fig. 3 is the circuit diagram in the utility model most preferred embodiment.

Circuit in the phone dialing limiter comprises microprocessor 3; pulse signal detector 4; switching circuit 6; the control end of switching circuit links to each other with the F output of microprocessor; the output of pulse signal detector links to each other with the P input of microprocessor; in addition; the input of switching circuit links to each other with an output of a protection and ring alternating current circuit 5; one pulse control switch circuit 7 with after extraneous telephone set 2 is connected respectively with the C of switching circuit; D two outputs; the E of pulse signal detector; the G of H two inputs and a power circuit 8; J two inputs link to each other and constitute three loops successively; the 3rd end of pulse control switch circuit 7 links to each other with another output of said protection and ring alternating current circuit, and the output of power circuit links to each other with the power input of microprocessor.In physical circuit, switching circuit 6 is by resistance R 1, R2, transistor BG1, BG2, BG3 form, transistor BG1 and transistor BG2 form a loop with resistance R 1 after forming a multiple tube again, one end of resistance R 2 links to each other with the F output of microprocessor, and the other end links to each other with the base stage of transistor BG3, and the collector electrode of transistor BG3 links to each other with the base stage of transistor BG2, the emission of transistor BG3 is the D output of switching circuit very, and the emission of transistor BG2 is the C output of switching circuit very; Pulse control switch circuit 7 constitutes a loop by resistance R 3 and transistor BG4 and forms, resistance R 3 links to each other with the telephone set in the external world with B point on the transistor BG4 line, the collector electrode of transistor BG4 links to each other with the D output of switching circuit, the H input of pulse signal detector, the J input of power circuit respectively, and the emitter of transistor BG4 links to each other with another output of protection and ring alternating current circuit; Power circuit 8 is made up of resistance R 4, R5, capacitor C 1, C2, transistor BG5, resistance R 4 is connected between the collector electrode and base stage of transistor BG5, capacitor C 1, C2, resistance R 5, transistor BG5 constitute a loop, on capacitor C 1 and capacitor C 2 lines is the J input and an output of power circuit a bit, the current collection of transistor BG5 is the G input of power circuit very, and on capacitor C 2 and resistance R 5 lines is another output of power circuit a bit; In this most preferred embodiment, the model that transistor BG1 adopts is 2N5401, and the model of transistor BG2, BG3, BG4, BG5 is 2N5551, the model of microprocessor is MC68HC05P9, its 5 pin is input P, and 22 pin are output F, and 14,28 pin are power input.The operation principle and the process of above-mentioned phone dialing limiter are as follows: under the telephone set hook state, transistor BG3, BG4 end, power circuit, pulse signal detector and all not power consumptions of microprocessor, the electric current I of multiple tube of flowing through depends on the impedance of telephone set fully, when adding the AC signalling signal, owing to the existence of telephone set self AC signalling circuit makes multiple tube to the complete conducting of bell signal, at this moment ringing telephone stations; Under the telephone set off hook state, the positive pressure drop that resistance R 3 produces makes transistor BG4 saturation conduction, and B point current potential is limit at 0.6V, and this moment, power circuit was started working, and when the both end voltage of capacitor C 2 was raised to 2.5V, microprocessor was started working; Telephone set is in dialing procedure, when telephone set sends the continuous pulse of electric current, synchronous and its saturation conduction of multiple tube and transistor BG4, when telephone set sends the disconnected pulse of electric current, multiple tube and transistor BG4 and its end synchronously, microprocessor testing result is deposited in and with database in number relatively, in case of limitting the number of dialling, F holds and exports high level immediately, transistor BG3 saturation conduction, cause that multiple tube ends, the attitude that restores to the original state after 1 second is as non-dail-limiting number, F holds the attitude of remaining stationary, the microprocessor zero clearing waits the dialing of Three-Way Calling to be detected, and picks up counting, surpass limiting time as conversation, F end output high level, multiple tube ends, and attitude restored to the original state after 1 second; After the telephone set on-hook, circuit quits work; When F end output high level caused that multiple tube ends, it was disconnected to show as direct current outside on the circuit, and the time was 1 second, was equivalent to the telephone set on-hook signal.

Compared with prior art, the utlity model has following advantage:

1, adopt telephone system self power supply, power consumption is little, experiment showed, that the power consumption of the utility model product only is 1/25 of prior art products power consumption;

2, reliability height, circuit does not use external power supply, is not subjected to power supply network The many inconvenience that bring because of powerup issue in installation, the use have been avoided in impact;

3, low cost of manufacture, its cost are about 4/5 of prior art products cost;

4, adopt transistor switching circuit to replace relay switching circuit of the prior art, do not have sparking, burn into loose contact phenomenon, the reliability height.

Claims

1; a kind of phone dialing limiter; comprise microprocessor [3] in the circuit; pulse signal detector [4]; switching circuit [6]; the control end of said switching circuit links to each other with the output of microprocessor [F]; the output of said pulse signal detector links to each other with the input of microprocessor [P]; it is characterized in that: the input of said switching circuit links to each other with an output of a protection and ring alternating current circuit [5]; one pulse control switch circuit [7] with after extraneous telephone set [2] is connected respectively with two output [C of said switching circuit; D]; two input [E of pulse signal detector; H] and two input [G of a power circuit [8]; J] linking to each other constitutes three loops successively; the 3rd end of said pulse control switch circuit [7] links to each other with another output of said protection and ring alternating current circuit, and the output of said power circuit links to each other with the power input of microprocessor.

2, phone dialing limiter according to claim 1 is characterized in that:

(1) said switching circuit ［ 6 ］ is by resistance ［ R1, R2 ］, transistor ［ BG1, BG2, BG3 ］ form, said transistor ［ BG1 ］ is formed a loop with resistance ［ R1 ］ after forming a multiple tube with transistor ［ BG2 ］ again, one end of said resistance ［ R2 ］ links to each other with the output ［ F ］ of microprocessor, the other end links to each other with the base stage of transistor ［ BG3 ］, the collector electrode of said transistor ［ BG3 ］ links to each other with the base stage of transistor ［ BG2 ］, the output ［ D ］ of the very said switching circuit of emission of transistor ［ BG3 ］, the output ［ C ］ of the very said switching circuit of emission of transistor ［ BG2 ］;

(2) said pulse control switch circuit ［ 7 ］ is made up of resistance ［ R3 ］ and transistor ［ BG4 ］ formation one loop, a bit ［ B ］ on said resistance ［ R3 ］ and transistor ［ BG4 ］ line links to each other with the telephone set in the external world, and the collector electrode of said transistor ［ BG4 ］ links to each other with the output ［ D ］ of said switching circuit, the input ［ H ］ of pulse signal detector, the input ［ J ］ of power circuit respectively;

(3) said power circuit ［ 8 ］ is by resistance ［ R4, R5 ］, electric capacity ［ C1, C2 ］, transistor ［ BG5 ］ is formed, said resistance ［ R4 ］ is connected between the collector electrode and base stage of transistor ［ BG5 ］, said electric capacity ［ C1, C2 ］, resistance ［ R5 ］, transistor ［ BG5 ］ constitutes a loop, on said electric capacity ［ C1 ］ and electric capacity ［ C2 ］ line is an input ［ J ］ and an output of said power circuit a bit, another input ［ G ］ of the very said power circuit of current collection of said transistor ［ BG5 ］, on said electric capacity ［ C2 ］ and resistance ［ R5 ］ line is another output of said power circuit a bit.

3, phone dialing limiter according to claim 2, it is characterized in that: the model of said transistor ［ BG1 ］ is 2N5401, the model of transistor ［ BG2, BG3, BG4, BG5 ］ is 2N5551, the model of said microprocessor is MC68HC05P9, its 5 pin is input ［ P ］, 22 pin are output ［ F ］, and 14,28 pin are power input.