CN1211866A - Intellectual facsmile telephone supervisor - Google Patents

Abstract

An intelligent fax-telephone manager is a controller using single-chip microcomputer as core, which is composed of lightning stroke preventing AC power supply input circuit, low-voltage DC circuit, soft starter of AC power supply output, overvoltage protector, single-chip microcomputer, antitheft line circuit, external line interface, ringing detector, signal amplifier, comparator, computerized exchanger, ringing current circuit, program-controlled analog switch, dual-tune detector, fax signal interface, extension interface and music output circuit.

Description

Intellectual facsmile telephone supervisor

The present invention relates to a kind of intelligent facsimile, telephone supervisor.Particularly a kind of multi-functional fax with controlled by single chip microprocessor, telephone supervisor.

Facsimile machine actual fax sending and receiving file every day that uses is less at present, mostly with facsimile machine and the shared telephone line of telephone set.Owing to can't determine that each ring faxes or call, often make troubles like this to the user.If promptly the facsimile machine whole day is started shooting and is arranged on the less state that just can change fax of ringing number, this is comparatively convenient for the nature of receiving faxes; But Shi Zehui occurs also not waiting and picks up mobile phone if call, and facsimile machine cuts off the telephone bandset circuit already, transfers the phenomenon of FAX mode to automatically, has influenced the normal use of phone.If facsimile machine is arranged on the state that just changes fax after the ring of more sound, do not influence the reception phone like this, tend to make the side of sending a fax to think that facsimile machine does not have to start shooting by mistake and the problem of not sending a fax but but exist.If at ordinary times with facsimile machine shutdown, establish that the operator on duty receives faxes and phone, in the time of then can having unattended operation, as after coming off duty, night, day off the problem that can't receive faxes.Therefore this is a hard nut to crack that is always perplexing vast fax, the shared outside line user of phone for many years.In order to address this problem, the facsimile machine that some that are occurred on the international market carry the advanced person of telephone set designs all that to have automatic identification CNG signal be the facsimile signal or the function of telephone signal with differentiation.As Korea S HS1000 facsimile machine, but this function can only be applicable to the automated facsimile machine station of initiatively sending out the CNG signal; And under the situation of manually sending a fax for great majority, the CNG signal does not send; So it still is the problem of telephone signal that above-mentioned facsimile machine still can't solve the identification facsimile signal.

Patent (the patent No.: 96244123.6) in " intelligent telephone supervisory device ", once related to fax, telephone signal automatic recognition problem that I was applied in 96 years; But the present invention and its have great essential distinction on circuit design; but also have the unexistent facsimile machine of former patented technology start soft start and power supply overpressure protection circuit engineering, the problem that this technology causes facsimile machine to be easy to damage in the time of can preventing to substantially exceed 220 volts of voltages because of the frequent start of facsimile machine transmitting-receiving and summer high temperature line voltage in season effectively.

The objective of the invention is in order to overcome the defective of prior art, provide a kind of multiple functional intelligent degree height and cost lower, the novel facsmile telephone supervisor that is easy to produce.It can discern fax, telephone signal automatically, the work of automatic switch facsimile machine power initiation facsimile machine; And carry out superpressure voltage-stabilizing protection and anti-lightning strike protection; And manage phone effectively, with practical solution fax at present, the existing various difficult problems of the shared telephone wire of phone.

The objective of the invention is to realize by the device of the following architectural feature that limits:

1. an intelligent facsimile, telephone supervisor, it is characterized in that control circuit is that core constitutes with the single chip microcomputer circuit, testing circuit, ringing-current circuit, direct inward dialing to extension autom circuit, music output circuit link to each other with comparator frequently with facsimile signal interface circuit, extension interface circuit, exterior-line interface circuit, AC power output soft start and overpressure protection circuit, program control simulation switched circuit, anti-theft wire circuit, ring detecting circuit, double-tone respectively for it; Facsimile signal interface circuit, extension interface circuit link to each other with ringing-current circuit and program control simulation switched circuit simultaneously; Exterior-line interface circuit connects anti-theft wire circuit, ring detecting circuit and signal amplification circuit; The output termination AC power output soft start and the overpressure protection circuit of AC power input protection and low-voltage dc circuit; The output of direct inward dialing to extension autom circuit, music output circuit connects signal amplification circuit; Signal amplification circuit also links to each other with comparator; Program control simulation switched circuit is connected with double-tone frequency testing circuit.

2. preceding paragraph 1 described intelligent facsimile, telephone supervisor, it is characterized in that described master singlechip circuit, comprise single-chip microcomputer integrated circuit, exterior interrupt expanded circuit, the anti-jamming circuit of forming by monostable trigger and the sinusoidal wave generation circuit of forming by single-chip microcomputer and dual operational amplifier.

3. preceding paragraph 1 described intelligent facsimile, telephone supervisor, it is characterized in that anti-lightning strike protection of described AC power and low-voltage dc circuit, comprise the lightning prevention circuit of forming by capacitor, inductance, piezo-resistance, the suspension low-voltage dc circuit of being made up of transformer, rectifier, capacitor reaches by transformer, rectifier, diode, capacitor, the 12V that integrated regulator is formed, the 5V direct current regulation circuit; Described AC power output soft start and overpressure protection circuit; comprise by transformer, rectifier, resistor, diode, reach the interchange zero-detection circuit that operational amplifier is formed; the AC power output sampling circuit of forming by transformer, rectifier, resistor, capacitor, diode and operational amplifier, output AC power source soft start and the overpressure protection circuit formed by single-chip microcomputer, photoelectrical coupler, triode (V1), power field effect pipe and voltage-stabiliser tube, current-limiting resistance, rectifier.

4. preceding paragraph 1 described intelligent facsimile, telephone supervisor is characterized in that described exterior-line interface circuit is made of diode, rectifier, resistor, triode; Described ring detecting circuit is made up of resistor, capacitor, diode; Steal line detection circuit and disturb line circuit described antitheft comprising with telephone line circuitry, and wherein resistor, capacitor, voltage stabilizing didoe and operational amplifier are formed and stolen line detection circuit, the interference line circuit of being made up of resistor, light-emitting diode, triode;

5. preceding paragraph 1 described intelligence, facsmile telephone supervisor is characterized in that described program control simulation switched circuit is made of the simulation switched integrated circuit; Testing circuit is by dual-tone multifrequency receiving integrate circuit, resistor frequently for described double-tone, and capacitor is formed; Described ringing-current produces electric routing power transformer, resistor, triode, bidirectional triode thyristor composition;

6. preceding paragraph 1 described intelligent facsimile, telephone supervisor is characterized in that described signal amplification circuit is made up of resistor, capacitor, diode and conversation integrated circuit; Described comparator circuit is made of operational amplifier, resistor; Described direct inward dialing to extension autom circuit comprises speech IC, resistor, capacitor composition; Described music output circuit is made up of music integrated circuit and resistor.

7. preceding paragraph 1 described intelligent facsimile, telephone supervisor is characterized in that described extension interface circuit is by signal deteching circuit, constant-current source circuit, control relay circuit and capacitor and telephone socket composition; Described facsimile signal interface circuit is made up of input, constant-current source circuit, control relay circuit three parts and capacitor, telephone socket, wherein photoelectrical coupler and resistor are formed signal deteching circuit, resistor, diode and triode are formed constant-current source circuit, and resistor, diode, triode, relay are formed control relay circuit.

The present invention compared with prior art has the following advantages:

1, the present invention combines with the mode that detects facsimile machine CNG signal and dialing simultaneously with the direct inward dialing to extension autom integrated circuit, can discern automatically facsimile signal and telephone signal accurately and reliably.Detect the mode that has or not the CNG signal to discern the fax telephone signal and compare with simple dependence in the prior art, often do not have the CNG signal to send the defective that to discern when manually sending a fax thereby overcome as the calling party.With my patented technology " intelligent telephone supervisory device, the patent No.: 96244123.6 " though in the mode of identification fax, telephone signal compare symbolic animal of the birth year seemingly; But former patented technology relies on the digital recording main circuit to discern.Identification to fax, telephone signal only is its part of functions, so its circuit complexity, the manufacturing cost height; And the present invention is custom-designed fax, telephone signal identification circuit, compares with former patented technology then to have the advantage that function is single-minded, simple in structure, cheap, be convenient to produce.

2, the control to the facsimile machine power supply only is simple relay switch in the prior art, without any safeguard measure.And the present invention has three resist technologies: (1) carries out the lowering and stabilizing blood pressure levelling of pure sinusoid when AC supply voltage surpasses 225 volts, make the supply power voltage to facsimile machine be stabilized in 220 volts; Thereby the protection facsimile machine avoids under high pressure working, with anti-tamper.(2) having facsimile machine start inrush current limitation is the soft startup of electric power function, thereby prevents under the situation of the more frequent start of fax quantity the damage to the facsimile machine Switching Power Supply.(3) have AC power lightning prevention circuit and telephone wire input lightning protection circuit, damage thereby protected this machine and the facsimile machine of being managed, telephone set to exempt from thunderbolt.

3, have and prevent that other people from usurping the telephone wire function.

The present invention is carried out the more description of detail for below the embodiment that closes accompanying drawing.

Fig. 1 is a theory diagram of the present invention.

Fig. 2～Fig. 5 is each element circuit physical circuit figure of the present invention.

It is that core cooperates AC power input protection and low-voltage dc circuit that the present invention mainly adopts new single chip microcomputer AT89C52; AC power output soft start and overpressure protection circuit; ring detects and the antitheft telephone line circuitry of using; fax, telephone signal automatic identification circuit, the program control analog switch circuit and the favourable turn circuit that has a power failure wait to be realized.It is made up of following 17 partial circuits.As shown in Figure 1: (A) is AC power input lightning prevention circuit and low-voltage dc circuit among the figure; (B) be AC power output soft start and overpressure protection circuit; (C) be the single chip microcomputer circuit; (D) be the anti-theft wire circuit; (E) be exterior-line interface circuit; (F) be ring detecting circuit; (G) be signal amplification circuit; (H) be comparator; (I) be the direct inward dialing to extension autom circuit; (J) be the ringing-current circuit; (K) be program control simulation switched circuit; (L) be double-tone testing circuit frequently; (M) be the facsimile signal interface circuit; (N) be extension (1) interface circuit; (O) be extension (2) interface circuit; (P) be extension (3) interface circuit; Q is the music output circuit.Accompanying drawing 2～5th, electrical schematic diagram of the present invention is set forth formation, principle and the function of each several part circuit of the present invention as routine detail.

(A) AC power is imported anti-lightning strike protection and low-voltage dc circuit: by lightning prevention circuit, suspension low-voltage dc circuit and 12V, 5V direct current regulation circuit 3 parts are formed.Wherein C1, C2, C3, LF3 and piezo-resistance VR1, VR2 form anti-lightning strike protective circuit; Power supply transformation road T1 level N2 and bridge rectifier BD1, C4 form and ground insulation suspension low-voltage dc circuit; T1 level N3, bridge-type is put in order device BD2, D2, D4, C5～C8 and 12V, and 5V integrated regulator IC6, IC7 form 12V, 5V voltage stabilizing input circuit.

(B) AC power input soft start and overpressure protection circuit: by zero cross detection circuit, output voltage/frequency-conversion circuit, output control circuit three parts are formed.Wherein zero cross detection circuit by R2, D2, D7, R3, R4, R5, and operational amplifier LM358 (IC5) form; The voltage/frequency translation circuit is by output voltage sampling transformer T2.BD4, C9.C46～C48.R6～R10, compositions such as W1 and voltage/frequency translation circuit LM331, (IC19); Output control circuit is made up of AC/DC convertor BD3, V～metal-oxide-semiconductor field effect transistor MT10N90 (V1), optocoupler 4n25 (IC18) and current-limiting resistance R12, voltage stabilizing didoe D5 etc.

(C) single chip circuit: by single-chip microcomputer, outer Interrupt Source Expanded Circuit, sinusoidal wave generation circuit 4 parts of watchdog circuit and 600HZ signal tone are formed.Wherein single chip microcomputer AT89C52 (IC1), C10, C11, C12 crystal are formed single-chip microcomputer electrical equipment, 8 input NOR gate CC4078 (IC2) form outer Interrupt Source Expanded Circuit, and monostable touching received device 74HC123 (IC3) and R17, R19, C13, C14 forms the house dog anti-jamming circuit; Dual operational amplifier LM358 (IC4) and R20～R27, C15～C21 forms sinusoidal wave generation circuit.

(D) anti-theft wire circuit: by stealing line detection circuit and disturbing line circuit two parts to form.Wherein form and steal line detection circuit, form by R3, light-emitting diode D9, triode V6 and disturb line circuit by R34～R37, C24, C25, voltage stabilizing two utmost point D10 and dual operational amplifier LCM358 (IC8a).

(E) outside line interface tube circuit: form by discharge diode VR3, reversal BD5, R28～R30 triode V4, V5.

(F) ring detecting circuit: form by R31, R32, C23 and voltage stabilizing didoe D8.

(G) signal amplification circuit: form by R38～R50, C26～C36, D11 and conversation integrated circuit TEA1062 (IC9).

(H) this is than device: be made up of R51～R53 and operational amplifier LM358 (IC8b).

(I) direct inward dialing to extension autom circuit: form by R54～R56, C37 and language integrated circuit R4812 (IC10).

(J) ringing-current produces circuit: be made up of power transformer T1 level time N4, R14～R16, triode V3, bidirectional triode thyristor SCR1.

(K) program control simulation switched circuit: form by simulation switched integrated circuit CD2210 (IC16).

(L) double-tone frequency testing circuit: form by R74～R76, C43, C44, crystal and dual-tone multifrequency receiving circuit MT8870 (IC17).

(M) facsimile signal interface electrical equipment: form by input, constant-current source circuit, control relay circuit three parts and C39, P3.Wherein photoelectrical coupler PC817 (IC13) and R71 form signal deteching circuit, and R60, R61, D14, D15 and triode V8 form constant-current source circuit, and R67, D22, triode V12, relay J 3 are formed control relay circuit.

(N) No. 1 extension set interface circuit: form by signal deteching circuit, constant-current source circuit, control relay circuit and power failure favourable turn circuit and P2, C38.Wherein photoelectrical coupler PC817 (IC12) R70 forms signal deteching circuit, R58, R59, D12, D13, and triode V7 form constant-current source circuit, R66, D11, triode V11 relay J 2 are formed control relay circuit, and relay J 1, D20 form the favourable turn circuit that has a power failure.

(O) signal deteching circuit formed by photoelectrical coupler PC817 (IC14) and R72 of No. 2 extension set interface circuits, the constant-current source circuit that R12, R63, D16, D17 and triode V9 form, control relay circuit and formations such as socket P4, C40 that R68, D23 triode V13 and relay J 4 are formed.

(P) No. 3 extension set interface circuits: the signal deteching circuit of forming by photoelectrical coupler PC817 (IC15) and R73, the constant-current source circuit that R64, R65, D18, D19 and triode V10 form, the control relay circuit that R69, triode V14, D24 and relay J 5 are formed, and formations such as socket P5, C41.

(Q) music output circuit: form by music integrated circuit IC11 and R57.

Groundwork principle of the present invention divides several situations to be summarized as follows:

The present invention to fax, telephone signal discerns automatically, the cardinal principle of management is automatically: establish machine of the present invention and be the callee, the Xiang Benji side who becomes to make a phone call that sends a fax is the calling party.If the calling party will send a fax, generally have and send a fax automatically and several modes of manually sending a fax.

(1) send a fax automatically: calling party's facsimile machine is dialed my phone numbers automatically by setting-up time, detects ring-back tone simultaneously.When this power ringing testing circuit receives outside line ringing-current voltage, promptly trigger single-chip microcomputer and enter external interrupt, single-chip microcomputer begins to carry out identification fax, telephone signal subprogram.At first simulate off-hook.When calling party's facsimile machine detects less than ring-back tone, just judge callee's off-hook; So it is logical to send 1100HZ0.5S to the callee, the sinusoidal wave facsimile machine CNG signal that 3S is disconnected.This machine CNG signal deteching circuit detects the CNG signal, just triggers single-chip microcomputer and enters receipts fax subprogram.At first open the facsimile machine power supply, make facsimile machine enter operating state; Simultaneously by this machine programme-controlled exchange circuit to facsimile machine speech channel ring.When the facsimile machine that this machine is managed is received bell signal, promptly simulate off-hook.After single-chip microcomputer receives the facsimile machine off hook signal, stop ring immediately, simultaneously outside line and facsimile machine circuit are connected.At this moment this facsimile machine promptly sends the 2100HZCED answer signal to outside line, after calling party's facsimile machine is received this facsimile machine CED signal, just begins facsimile with this facsimile machine.Behind the fax completion, this facsimile machine is promptly simulated on-hook.After single-chip microcomputer is received on-hook signal, at first turn-off this machine simulation circuit for answering, discharge outside line; Delay time then and turn-offed this facsimile machine power supply in 1 minute.

(2) calling party manually sends a fax.Same as above, the caller dials loCal number; This machine is promptly simulated off-hook after receiving bell signal.After universal law calling party personnel can't hear ring-back tone, just know callee's off-hook, at this moment it will be waited for when hearing CED facsimile machine answer signal and just can send a fax; When perhaps the someone answered the call, it told the callee, said and oneself will send a fax, and please the callee give a facsimile machine signal; Be that the callee personnel open the facsimile machine power supply, click the key of sending a fax, facsimile machine just sends the CED answer signal.Therefore the present invention promptly designs by the direct inward dialing to extension autom circuit and replaces the manual answering at above-mentioned situation, at first this machine promptly detects behind the simulation off-hook not CNG signal, starting the direct inward dialing to extension autom circuit simultaneously sends to outside line: " this machine is that computer is on duty; request 8 when you send a fax; make a phone call to request extension number, and directory enquiry requests 1 voice signal.The calling party promptly dials 8 after hearing above-mentioned speech, after this machine double-tone frequency testing circuit detects 8 double-tones frequency, triggers single-chip microcomputer and enters interruption, changes and receives the subprogram of faxing.Promptly at first open the facsimile machine power supply, then to the facsimile machine ring; Facsimile machine promptly sends the CED answer signal after receiving bell signal, and after the calling party heard the CED signal tone, by the key of sending a fax, both sides' facsimile machine promptly carried out facsimile.

(3) calling party makes a phone call.Same as above, after this machine is received calling party's bell signal, the simulation off-hook, when detection has or not the CNG facsimile signal, send the speech of " this machine is that computer is on duty, sends a fax to request 8; make a phone call to request extension number, directory enquiry requests 1 " to the calling party by the direct inward dialing to extension autom circuit.Just dial extension number by prompt tone after the calling party hears, this machine double-tone decoding circuit frequently translates extension, and single-chip microcomputer commander programme-controlled exchange machine circuit is to this minute power ringing; Just stop ring behind the extension set off-hook, will arrive outside line extension set connection therewith simultaneously; The extension set personnel just can converse with the calling party like this.Talk-through, the extension set on-hook, single-chip microcomputer detects on-hook signal and just discharges outside line, and all return to the state of waiting.

Elaborate the operation principle of each several part below in conjunction with accompanying drawing 2～5.

Fax telephone signal automatic identification circuit principle:

(1) receives ring: when bell signal is sent in outside line, through the dc pulse voltage of BD5 rectification output greater than 100V, 75V voltage stabilizing didoe D8 is punctured, on R32, form the anodal pulse voltage of 3～5V, add to the P3.2 mouth of single-chip microcomputer IC1, trigger single-chip microcomputer and enter external interrupt, begin to carry out fax, the automatic recognition subroutine of telephone signal.

(2) simulation off-hook: at first the P2.5 mouth of single-chip microcomputer is exported high level, makes triode V4, V5 conducting, promptly simulates off-hook.The outside line direct current is through polarity transformation circuits BD5, and switching tube V4 adds on the conversation integrated circuit (IC) 9 (TEA1062).

(3) CNG input: if the calling party is automated facsimile machine station, then it promptly sends the CNG signal after detecting callee's off-hook.The CNG signal that the calling party sends is through BD5, and V4 enters IC9 (1) pin, and the back is added to operational amplifier IC8b by the output of (4) pin (2) pin input is amplified in the IC9 frequency-selecting.IC8b forms voltage comparator, and it is provided with suitable threshold voltage to improve anti-interference ability by R52, R53.When sinusoidal wave CNG signal during greater than its threshold value, IC8b (1) the pin CNG square-wave voltage that just output Shaping is good adds to the R1.4 mouth of single-chip microcomputer IC1, and IC1 just carries out when being confirmed to be the CNG signal and receives the fax subprogram this input.

(4) direct inward dialing to extension autom: owing to do not know that the calling party sends a fax or makes a phone call, therefore single-chip microcomputer is when waiting CNG signal to be detected, also by P2.4 mouth output high level, start digital speech circuit (IC10R4812), make its voice signal, after R56, C36 add to IC9 and amplify, enter outside line through V4, BD5 by the output of IC9 (1) pin by (7) pin output " this machine is that computer is on duty, sends a fax to request 8; make a phone call to request extension number; directory enquiry requests 1 ".

This machine adopts conversation integrated circuit TEA1062 that CNG signal and voice signal are carried out two-way amplification, forms anti-side-tone circuit by R39～R43, R45 and C28 simultaneously, amplifies interference each other to prevent amplification of CNG signal and voice signal.

(5) double-tone detects frequently: single-chip microcomputer is behind the simulation off-hook, give an order to switched circuit IC16 (CD22100) A0～A3, DI, ST mouth by its P0.0～P0.5 mouth, COL1 and the ROW4 of IC16 are connected, open the passage that outer alignment double audio decoder IC17 (MT8870) transmits double-audio signal.If the calling party is artificial on duty when sending a fax or making a phone call, when it hears the setting of direct inward dialing to extension autom prompting or this machine of known in advance road, just can dial 8 or dial extension number.Its dual-tone dialing is through COL1～ROW4 make and break contact of BD5, V4, C22 and IC16, input port (2) pin that R76, C44 arrive I17.When IC17 had detected double-audio signal, its (15) pin output high level added to 9 pin of single-chip microcomputer P1.6 mouth and 8 input NOR gate integrated circuit (IC), 2 (CC4078).IC2 (13) pin output low level triggers single-chip microcomputer P3.3 mouth and enters external interrupt, when single-chip microcomputer detects the P1.6 mouth and is high level, just read in the decoding data of IC17 by P0.0～P0.3 mouth, if judged result is 8, then carries out the subprogram of sending a fax; If judge it is extension number, then carry out receiving the phone subprogram.

In sum, the present invention is detected three kinds of methods frequently and is combined by CNG detection and direct inward dialing to extension autom, double-tone, and no matter just can discern like clockwork is fax and telephone signal under the various situations such as send a fax automatically or manually send a fax or make a phone call.

Receive faxes, the automatic management during phone:

(1) facsimile machine management: decipher frequently when judging the calling party and will send a fax by detecting CNG signal and double-tone when single-chip microcomputer, carry out immediately and receive the fax subprogram.At first the P3.6 mouth of IC1 is exported high level, make triode V1 conducting, drive photoelectrical coupler IC18 (4) (5) pin conducting, at this moment the suspension low-voltage direct by BD1 rectification, C4 filtering output adds to field effect transistor V2 source electrode through R11, R12, IC18, makes the V2 saturation conduction.Thereby make the 220V AC power of A, B, two ends input arrive facsimile machine power supply input C, D two ends through LF1, BD3, V2, because the facsimile machine mains switch is all being opened the position at ordinary times, so in a single day C, D two ends have the alternating voltage of 220V, the fax work of starting shooting immediately.The conduction voltage drop of bridge rectifier BD3, field effect transistor V2, R12 is compared and can be ignored with 220V less than 3V; Therefore C, D, both end voltage equal the 220V ac grid voltage of A, the input of B two ends substantially, and its effect mainly is the electronic switch as control facsimile machine power supply.

(2) facsimile machine line management

After to the facsimile machine power supply, the P2.0 mouth of single-chip microcomputer IC1 is also exported high level; Make triode V12 conducting, relay J 3 actions, its back contact disconnects, the adhesive of normal off point; Make the facsimile machine line inlet through socket P3 and ringing-current circuit UNICOM.After the P2.0 of IC1 mouth output high level postponed 10ms, P0.6 mouth output low level made triode V3 conducting, triggered bidirectional triode thyristor SCR1 conducting.The 70V sine voltage that T1 level of power transformer N4 is produced adds to facsimile machine circuit input port through SCR1, relay J 3 normal offs point, P3, forms bell signal.Single-chip microcomputer is according to the ring subprogram simultaneously, and behind SCR1 conducting 1S, the P0.6 mouth is exported high level again and turn-offed V3 and SCR1; P2.0 mouth output low level is ended V12 then, and J3 discharges, normally closed some adhesive; The constant current testing circuit output of being made up of photoelectrical coupler IC13, R60, R61, D14, D15, V8 is powered to facsimile machine telephone line inlet through the normally closed point of J3, P3.Promptly change FAX mode owing to generally all facsimile machine is arranged on before use after receiving ring for the first time, so facsimile machine forwards the receipts FAX mode rapidly to after this machine of receiving ring in 1 second.It at first simulates off-hook, and this machine constant-current source is in the power supply of facsimile machine telephone line, and IC13 detects supply current by photoelectrical coupler, makes to occur the 2 pin inputs that high level adds to single-chip microcomputer P1.0 mouth and 8 input NOR gate IC2 on the R71.Make IC2 (13) pin output low level trigger single-chip microcomputer P3.3 mouth and enter interruption, single-chip microcomputer detects and just stops to carry out the ring subprogram when P1.0 mouth is high level; P0.0～P0.5 mouth output command commands switched circuit IC16 with switch connection in ROW3 and the COL1 simultaneously.Even the facsimile machine circuit is through the normally closed point of P3, J3, C39, ROW3, COL1, C22, V4, BD5, P1 and outside line UNICOM.At this moment facsimile machine sends the CED answer signal to outside line, when the calling party hears the CED answer signal, promptly sends a fax, and two machines begin facsimile.To converse integrated circuit to facsimile generation interference in order preventing during this period, to close the output circuit of IC9 by single-chip microcomputer P2.6 mouth output high level.

After facsimile finished, this machine management facsimile machine was simulated on-hook automatically, the output of constant-current source circuit no current; Therefore photoelectrical coupler ends, and presents low level on the R71, and single-chip microcomputer detects the P1.0 mouth and becomes low level, promptly makes V5, V4 end, simulate on-hook by P2.5 mouth output low level, discharges outside line; To the IC16 output command COL1 and ROW3 are disconnected simultaneously, P2.6 mouth output low level makes IC9 return to the preparation state.Delay time after 1 minute, single-chip microcomputer P3.6 mouth becomes low level, and V1 is ended, and photoelectrical coupler IC18 ends, and field effect transistor V2 ends, and has promptly turn-offed the facsimile machine power supply.All all return to the state of waiting.

(3) to the automatic management of phone

When single-chip microcomputer IC1 deciphers when judging the calling party and will make a phone call frequently by double-tone, carry out immediately and receive the phone subprogram.At first according to extension number that the calling party dials to this minute power ringing. suppose that it dials (1) double-tone frequently, then single-chip microcomputer P2.1 mouth output high level makes the V11 conducting, relay J 2 adhesives, No. 1 extension is through P2, relay J 1 contact, J2 normal off point and ringing-current connection.Single-chip microcomputer P0.6 mouth output low level behind the time-delay 10ms makes triode V3 conducting, triggers bidirectional triode thyristor SCR1 conducting, and 70V ringing-current voltage is to No. 1 branch power ringing.After 1 second of ring, the P0.6 mouth becomes high level, turn-offs SCR1, stops ringing voltage output; P2.1 mouth output low level then, V11 ends, and J2 discharges, and No. 1 extension is by normally closed point of J2 and the connection of this machine constant-current source circuit.The 12V DC power supply is powered to No. 1 extension set through photoelectrical coupler IC12 and by the constant-current source circuit that R58, R59, D12, D13, triode V7 form.If No. 1 extension set off-hook, then IC12 (3) pin becomes high level, adds to single-chip microcomputer IC1P1.1 mouth and IC2 (3) pin; IC2 (13) pin output low level triggers IC1 and enters interruption, is given an order to IC16 by P0.0～P0.5 mouth, makes No. 1 extension set through C38, ROW1～COL1 of IC16, C22, V4, BD5 and outside line UNICOM, and at this moment No. 1 extension set just can be talked with the calling party.If No. 1 extension set off-hook not after the 1S ring, then behind the failure of oscillation 4S clock, single-chip microcomputer P2.1 mouth is exported high level again, makes relay J 2 adhesives, connects ringing circuit; Postpone behind the 10ms P0.6 output low level again, make the SCR1 conducting to No. 1 extension set output ringing signal.Turn-off ring output behind the ring 1S again, make No. 1 extension set connect permanent source circuit, detect off hook signal; As do not have off-hook, continue the 3rd ring behind the 4S.By that analogy, still do not have off-hook as 5 rings, then this machine turns to the branch power ringing No. 2, and nobody connects as ring 3 times, then turns to the branch power ringing No. 3.To other minute power ringing program with No. 1 extension set, promptly the 1S 4S that shakes stops.Detect this extension set constant-current source electric current during failure of oscillation, if this extension set off-hook, then the photoelectrical coupler output high-voltage flat of constant-current source electric current output detection triggers single-chip microcomputer.Order switched circuit IC16 connects this extension set and outside line, can talk with the caller machine.

When this machine divides power ringing, single-chip microcomputer IC1, P2.7 mouth output high level, trigger music integrated circuit IC11 outputting music signal adds to speaking circuit IC9 (TEA1062) through R57, C36 input (7) pin, amplify after V4, BD5 are transported to outside line by IC9, listen to the music for calling party's waiting period.

If this machine is in that repeatedly nobody answers the call after the ring to extension set, and the calling party is initiatively after the on-hook; Outside line is through BD5, and V4 sends into the on-hook signal sound, amplifies the back through IC9 and is exported by 4 pin and send into single-chip microcomputer P1.4 mouth after adding to the IC8b shaping; Single-chip microcomputer detects cycle 0.7S, behind this pulse modulated 450HZ on-hook signal sound of 50% of duty, promptly simulates on-hook, discharges outside line; Stop to stop to send music to outside line to a minute power ringing, all return to the state of waiting.

If this machine is to a minute power ringing, certain extension set off-hook, single-chip microcomputer detects off hook signal, just make P2.7 mouth output low level, stops to send music to outside line, simultaneously this extension set and outside line is connected.Both sides' speech finishes, and single-chip microcomputer detects calling party's on-hook signal sound and this machine on-hook signal simultaneously, then this machine is returned to the state of waiting.

The facsimile machine that this machine is managed is to outgoing faxes or photocopying materials.

To outgoing faxes: pick up telephone bandset on the facsimile machine, the constant-current source circuit of compositions such as V8 is powered to facsimile machine, and photoelectrical coupler IC13 exports high level, makes IC2 (13) pin output low level trigger single-chip microcomputer and enters interruption, single-chip microcomputer detects P1.0 mouth low level, promptly carries out and opens the facsimile machine subprogram.At first, open the mains switch of forming by V2, BD3 and power to facsimile machine by P3.6 mouth output high level; Then by P0.0～P0.5 mouth to switched circuit IC16 output command, ROW3 and COL1 are connected, the high level of P2.5 mouth output is simultaneously simulated off-hook, makes facsimile machine and outside line connection.At this moment facsimile machine just can uppick outside line signal tone, dials callee's facsimile machine telephone number then, hear that the other side connects and send the CED signal tone after, by the key of sending a fax, just can carry out facsimile.Behind the fax completion, the simulation on-hook, IC13 output low level then, single-chip microcomputer detects this signal, and the COL1 of IC16 and ROW3 are disconnected, P2.5 mouth output low level, simulation on-hook, release outside line; Turn-offed the facsimile machine power supply after delaying time simultaneously 1 minute.

Copy function: duplicating switch K1 is beaten to logical position, the P1.5 mouth input high level of IC2 (12) pin and IC1, IC2 (13) output low level triggers single-chip microcomputer and enters interruption; When single-chip microcomputer detects the P1.5 mouth and is high level, just carry out and duplicate subprogram, i.e. P3.6 mouth output high level is opened the facsimile machine switch.After facsimile machine duplicates and finishes, K1 is beaten to disconnected position, it is low level that P1.5 mouth input low level, single-chip microcomputer detect the P1.5 mouth, just turn-offs the facsimile machine power supply.

This machine 1 is with 4 programme-controlled exchange functions.

The function of exchange that these facility have 4 extensions of 1 outer tape to intercom mutually, at this moment facsimile machine can do that phone uses or the P3 telephone socket does not connect facsimile machine and the machine of answering the call.

(1) 4 part machines are dialed in outside line.Before narrate, do not repeat to introduce at this.

(2) extension set is dialed outside line.Arbitrary extension set is picked up and is got final product direct outward dialing after mobile phone dials 0.With No. 3 extension sets that connect the P5 telephone socket is the example explanation, behind No. 3 extension set off-hooks, is powered to No. 3 extension sets through relay J 5 back contacts by the constant-current source circuit that R64, R65, D18, D19, V10 form.Photoelectrical coupler IC15 detects this supply current and just exports high level, adds to IC1, P1.3 mouth and IC2 (5) pin.IC2 (13) pin output low level triggers IC1 and enters interruption, when IC1 detects the P1.3 mouth and is high level, connects COL2 and ROW2 connection with ROW4 by P0.0～P0.5 mouth ROW2 that makes IC16 that gives an order.Add to the sinusoidal wave generation circuit of forming by dual operational amplifier LM358 (IC4) through C15 by the square-wave signal about P3.7 mouth output 600HZ at ordinary times, IC4a, IC4b and R20～R27, C16～C20 forms 4 rank and cuts this snow husband low pass filter, and the square-wave signal that the IC1P3.7 mouth is exported becomes the signal tone of pure sine wave as this machine stored-program control exchange.(because the signal tone that outside line is sent into is the sine wave of 450HZ,, program composition can be become the signal tone of 600HZ or other frequency, be beneficial to and the difference of outside line 450HZ signal tone) for the ease of 2 this machine of resolution and outside line signal tones.With the purpose of P3.7 mouth output square-wave signal conversion sine wave signal is to prevent the interference of the contained abundant high order harmonic of square-wave signal to dual-tone dialing.This 600HZ sine wave signal sound is through C20, and the COL2 of R27, IC16, ROW2, C41 deliver to extension set No. 3.Promptly hear this interior lines signal tone behind No. 3 extension set off-hooks, dial 0 then.This 0 double-audio signal is delivered to double-tone (2) pin input of decoder MT8870 (IC17) frequently by C41, ROW2, ROW4, R76, C44; IC17 (15) pin is just exported high level and is added to the P1.6 mouth of IC1 and (9) pin of IC2, makes IC2 (13) pin output low level trigger IC1 and enters interruption.When IC1 detects the P1.6 mouth and is high level, check at first promptly whether the P2.5 mouth is high level; If the P2.5 mouth is a high level, illustrate that this machine simulated off-hook, taken outside line.So IC1 control IC 16, make the ROW2 of IC16 and the analog switch between the COL2,0.7S connects, and 0.7s disconnects, the 600HZ sine wave signal of being sent into by IC4 has just formed cycle 0.7S like this, and this is that 50% pulse modulated 600HZ engaged signal sound sends extension set to No. 3 for a duty.No. 3 extension set is heard busy tone, i.e. on-hook, at this moment IC15 output low level.IC1 detects this on-hook signal, the just output of stop signal sound, and the ROW2 of IC16 and COL2, ROW4 are disconnected.

If it is not high level that IC1 detects the P2.5 mouth, illustrate that outside line is unoccupied; Therefore just make P2.5 mouth output high level, simulate off-hook.Simultaneously, control IC 16 makes its COL2 and ROW2 contact disconnect the output that stops the 600HZ signal tone, and COL1 and the ROW2 of IC16 connected.At this moment the sinusoidal wave continuous signal sound of outside line 450HZ just sends extension set to No. 3 through BD5, V4, C22, COL1, ROW2, C41.After No. 3 extension set is heard the signal tone of giving connection to external call, but just direct outward dialing telephone number, the phone of getting an outside line.Speech finishes after the on-hook, and IC15 detects this on-hook signal, output low level.IC1 detects the P1.3 mouth and becomes low level, just simulates on-hook, discharges outside line, makes IC16 disconnect connecting of ROW2 and COL, ROW4 simultaneously, is in the state of waiting then.

(3) converse between the extension set.When conversing between the extension set, pick up mobile phone and just hear the continuous sinusoidal wave interior lines of 600HZ signal tone, at this moment dial directly other extension number and get final product.With No. 2 confidential No. 1 extension sets of branch is the example explanation.

No. 2 extension set off-hooks are powered to No. 2 extension sets through the J4 back contact by the constant-current source that R62, R63, D16, DH, V4 form.Photoelectrical coupler IC14 detects output current and promptly exports high level and add to single-chip microcomputer IC1P1.2 mouth and IC2 (4) pin.IC2 (13) pin output low level triggers IC1 and enters interruption.When IC1 detected the P1.2 mouth and is high level, just COL4 and the COL2ROW4 with IC16 connected; At this moment the continuous sine wave signal sound of 600HZ sends extension set to No. 2 through COL2, COL4, C40.No. 2 extension sets hear that this signal tone just dials " 1 " double-tone number frequently, this double-audio signal through C40, COL4, ROW4 to double-tone frequency testing circuit IC17.Single-chip microcomputer IC1 reads from IC17 after the data of " 1 " just to No. 1 branch power ringing, simultaneously, COL2 and the COL4 of IC16 are connected, the time that switch connection disconnects between the COL2 of IC1 control IC 16 and the COL4, promptly connect IS, disconnect 4S, make the 600HZ sine wave signal of being sent into by IC4 form cycle 5S through the modulation of this switch, duty ratio is 1: 4 a ringing tone signal, the ring-back tone that this ring-back ring signal send to No. 2 extension sets through COL2, COL4, C40.Just stop ring after IC1 detects No. 1 extension set off-hook, and COL2 and the COL4 of IC16 disconnected, stop ring-back tone output, COL4 and ROW1 connect.At this moment No. 1 extension set just can be conversed with No. 2 extension sets.Speech finishes, and single-chip microcomputer detects the signal of arbitrary first on-hook, and the ROW1 of IC17 and COL4 are disconnected, and is in the state of waiting then.

(4) other ad hoc function.

The present invention has also that phone is logical broadcasts ad hoc functions such as outside line switching.These all are to realize by scm software, this not auspicious one by one stating.

Anti-lightning strike protection

This machine is provided with the anti-lightning strike protective circuit of being made up of C1, C2, LF1, VR1 in the AC power input, also is provided with the lightning prevention circuit that C6, VR2 form in AC power output.The puncture voltage of piezo-resistance VR1, VR2 is 470V, and the momentary pulse electric current is up to 5KA; When the thunder and lightning high pressure entered AC power, this protective circuit just can be with the lightning voltage clamper about 470 volts.And this machine BD3, the permission of field effect transistor V1 and facsimile machine Switching Power Supply is withstand voltage all greater than 600 volts; Therefore this protective circuit can prevent that this machine and facsimile machine from being damaged by the thunder and lightning of introducing from AC power.Be provided with discharge diode (VR3) lightning prevention circuit in the telephone wire porch with sample machine, about 200 volts punctures of this discharge diode, permission puncture pulse current 10KA; And interior telephone line of facsimile machine and this electromechanics words circuit allow withstand voltage also greater than 200 volts; Therefore, this lightning prevention circuit can guarantee that this machine and facsimile machine are not damaged by the thunder and lightning high pressure of introducing from telephone wire.

Facsimile machine start soft start and overpressure protection function

(1) start soft start

Switching Power Supply input high direct voltage filter capacitor capacity is bigger in the facsimile machine, so facsimile machine power supply start moment can produce the big electric current of very big high voltage surge.If not to the big electric current restriction of this high voltage surge, it is more to receive number of times at fax, and during to fax power supply frequent switch, facsimile machine inner high voltage filter capacitor and other relevant device will damage because of being subjected to the frequent start high pressure that produces import big surge rush of current, thereby cause facsimile machine to damage.

The preventing of this machine design surge current of starting shooting is that the soft starting circuit principle is: when single-chip microcomputer P1.3 mouth output low level, when driving photoelectrical coupler IC18 (5) (4) pin conducting; The alternating voltage that T1 level of power transformer N2 produces forms the direct voltage of about 13～14V through the BD1 rectification after the C4 filtering, add to power field effect pipe V2 grid, the two poles of the earth, source through R11, IC18.Because 10V voltage stabilizing didoe D5 clamper, voltage 10V only between R12～V2 grid; Again because make the gate source voltage of V2 saturation conduction must be greater than 4V, so R12 promptly becomes the current-limiting resistance of V2 saturation conduction; When V2 source resistance R2 value was 2 Ω, then the maximum saturation electric current of V2 was only about 3 amperes.Because the 220V line voltage adds to the facsimile machine Switching Power Supply through bridge rectifier BD3 and V2, R12 series connection, therefore when the moment to the facsimile machine power supply, although its Switching Power Supply inner high voltage filter capacitor charging resistor is very little; But because the restriction of field effect transistor V2 maximum saturation electric current, can be to the maximum charge stream of high-voltage capacitance greater than 3A yet, this is a safe current for facsimile machine Switching Power Supply input circuit.In the moment to fax start, because the metering function of V2,220 volts high pressure mainly falls on V2 like this, and what add to the Switching Power Supply input circuit is the low voltage safety electric current.Along with Switching Power Supply high-voltage capacitor charging electric current reduces gradually, charging voltage increases gradually, after the charging interval, field effect transistor V2 conduction voltage drop is normal value (less than 2V) at process 5RC; And 220 volts of ac output voltages are all supplied with the facsimile machine Switching Power Supply basically.

Owing to 5RC charge constant value number less (less than 1 second), therefore can not influence the speed of facsimile machine start work.Although and the high power consumption that field effect transistor V2 is bearing V3A more than 300 in start moment; But because the time is very short, the selected field effect transistor permission of this machine operating current reaches 12A in addition, operating voltage reaches 900V, and the design surplus capacity is bigger, is very safe therefore.

This mode of taking low-voltage, safe current to start to facsimile machine start power supply moment promptly is referred to as to call soft start, and this soft start function of this machine can be guaranteed to fax frequent start and can not damage.

(2) overpressure protection circuit

Switching Power Supply allows input ac voltage mostly between 160V～240V in the general facsimile machine, and when alternating voltage during greater than 230V, facsimile machine is operated near the limiting value.Because power load is lighter, add three-phase electricity consumption line voltage at uneven a lot of local night at night greater than 230 volts, have in addition lie prostrate up to more than 250, this has surpassed facsimile machine Switching Power Supply limiting value for operation; Especially under summer high temperature environment, make the work of facsimile machine superpressure again, then easily cause damage.

For this this machine has designed the overpressure protection circuit, its operation principle is: (1) voltage/frequency conversion.When to facsimile machine power supply 220V, exchange output sampling transformer T2 secondary voltage through the BD4 rectification, form the direct voltage of 4V after C9, R6, the C46 filtering, promptly sampling voltage is added to voltage/frequency conversion integrated circuit LM331 (IC19) 7 pin.LM331 is an analog to digital converter with high accuracy, wide temperature range, cheapness, and its output frequency strictly is proportional to input direct voltage.Therefore this voltage/frequency converter is aligned when 7 pin input voltage 4V, its (3) pin output frequency is 4KHZ; When the alternating voltage that adds to facsimile machine was 225V, the sampling direct voltage was input as 4.091V, and the IC5 output frequency is 4.091KHZ; By that analogy, when alternating voltage was 260V, the sampling direct voltage was output as 4.727V, and then the IC19 output frequency is 4.727KHZ.The P3.5 mouth that the output frequency of IC18 is added to single-chip microcomputer IC1 is the T1 mouth, and single-chip microcomputer is started shooting the subprogram establishment for when the T1 mouth detects incoming frequency greater than 4.091KHZ, promptly carries out the lowering and stabilizing blood pressure levelling.(3) lowering and stabilizing blood pressure adjustment.Ac grid voltage forms the 10ms width after BD3 reversal half cycles pulse voltage is added to the source-drain electrode of field effect transistor V2, if the V2 saturation conduction, then the voltage through BD3, V2 output is still 50HZ pure sine wave voltage; If V2 has several not conductings of half cycles in each second, then output voltage becomes discontinuous sine voltage of certain time.Because the alternating current of 50HZ has several half cycles to disappear, naturally its voltage effective value will fall at the end: if pass through the number of voltage sampling feedback regulation 50HZ AC power output half cycles, then this step-down levelling just can make output voltage stabilization in a certain range of set value.If field effect transistor V2 conducting, the time that ends just in time are on AC power supply zero point, then adjust the AC power of positive back output, still can be the pure sine wave alternating current of 50HZ, disturb without any high order harmonic component.

This machine decompression voltage regulator is promptly according to above-mentioned principle design.At first IC1 obtains the pulse at zero point by zero-detection circuit, zero-detection circuit by power transformer T1 time level N3, BD2, D2, R2, R3, R4, D7, and LM358 (IC5) operational amplifier etc. form.BD2 becomes the 8.5V alternating voltage of T1N3 into the 10ms pulsating direct current, inputs to (2) pin of IC5 via R2, and 3 pin of IC5 are obtained the voltage of IV by divider resistance R3, R4, and this voltage is compared with the pulsating voltage of (2) pin.When at AC power supply zero point, the pulsating voltage of (2) pin is lower than (3) pin voltage, IC5 operational amplifier (1) pin output high level; When alternating current during not at zero point, all greater than (2) pin voltage, IC5 is output low level then for the voltage of (3) pin; Therefore the high level of IC5 output promptly is the AC power supply zero point pulse.Wherein the effect of D7 is the input voltage clamper with (2) pin mouth, in case overtension damages IC5; The effect of D2 is to cut off the filtering of C5 to the 10ms pulse voltage of BD2 output.

When single-chip microcomputer IC1 detects incoming frequency greater than 4.091KHZ from the T1 mouth, just carry out the pressure regulation subprogram.When IC1 detects the AC power supply zero point pulse, just, make not conducting of photoelectrical coupler IC18 with P1.3 mouth output high level, field effect transistor V2 turn-offs.Simultaneously, should turn-off what 10ms 1 second according to the frequency computation part of T1 mouth input, so that the effective value of output AC voltage is reduced to about 220 volts; And according to time of this result of calculation decision P1.3 mouth output high level.The result of this levelling simultaneously feeds back to single-chip microcomputer T1 mouth through exchanging output sampling transformer T2 and voltage/frequency converter LM331 (IC19) in frequency height mode again; Single-chip microcomputer is promptly aligned error according to this feedback frequency correction, thereby has guaranteed the accuracy of this machine output voltage step-down levelling.

Several half cycles of this minimizing 50HZ AC power of the present invention reach alternating voltage and surpass 225 volts stable modes of aligning about 220 volts when above, are well suited for the machine of application switch power supply; As facsimile machine, computer etc.; Because its Switching Power Supply itself possesses the low-voltage voltage stabilizing output function between 160～220 volts.Promptly begin the design of voltage stabilizing just because of Switching Power Supply is this from low supply voltage very, just caused greater than 220 volts of voltages the time, the injectron angle of flow is very little, switching loss strengthens because the result of its voltage stabilizing levelling makes; Especially under too high voltages, easily cause injectron to puncture, design high drops so this machine does not design the low pressure voltage stabilizing and press voltage stabilizing just to have than significant protective effect.

The anti-theft wire function:

At normal hook state, outer telephone wire direct voltage is 48V; Add to R34 through BD5, the 48V voltage of D10, R35 punctures 15V voltage stabilizing didoe D10, and the voltage drop that makes R35 greater than operational amplifier LM358 (IC8a) (5) pin voltage, makes IC8a (7) pin output high level about 4V.

At this machine outside line extension telephone machine, when usurping telephone wire and making a phone call, outer line drop is to 10V as the people.Therefore voltage stabilizing didoe D10 can not puncture, and the voltage on the R35 is 0V, thereby makes IC8a (7) pin output low level trigger single-chip microcomputer.Single-chip microcomputer IC1 just carries out interference outside line subprogram after the P1.7 mouth detects this low level, it is P0.7 mouth output 1KHZ disturbing pulse, adding to triode V6 by R33 amplifies, output in the outside line to disturb through BD5 and steal the line phone and make its no normal dialing output, glittering the sending warning signal of while light-emitting diodes D9.After having only the on-hook of the line of robber telephone set, because outside line voltage returns to 48V, operational amplifier IC8a (7) pin output high level, single-chip microcomputer just stop to disturb

Favourable turn and single-chip microcomputer anti-jamming circuit have a power failure:

(1) power failure favourable turn circuit: this machine is when powering up, relay J 1 action, its two groups of back contacts disconnect with outer line socket, winding ground in two groups of normal off points, another group links with the intermediate ends of single winding point relay J2, and when AC power had a power failure, J1 lost voltage and discharges two groups of back contacts with No. 1 extension set socket P2 and outer line socket connection, such No. 1 extension set does not still influence and makes a phone call when having a power failure.

(2) single-chip microcomputer anti-jamming circuit

Single-chip microcomputer IC1 is at the square-wave signal of normal operating conditions by P3.7 mouth output 600HZ.This signal is given sinusoidal wave generation circuit machine signal tone in return on the one hand, triggers monostable on the other hand and touches receipts device IC3 (74HC123), makes its (4) pin output low level.In case when single-chip microcomputer can not normally be carried out by interference program, its P3.7 mouth also just can't be exported the 600HZ square-wave signal.At this moment IC3 does not produce output switching activity because of there being continuous 600HZ triggering signal, i.e. (4) pin output high level triggers single-chip microcomputer RST mouth through capacitor I C4, and single-chip microcomputer is resetted.The single-chip microcomputer rerun routine is worked and is recovered normal like this.

Compared with the prior art, the present invention also has great substantial breakthrough on circuit design.

1, adopted have international most advanced level new single chip microcomputer AT89C52 as this machine master controller, himself have 8K byte flash programmable and erasable read-only memory PEROM, and have remarkable advantages such as 3 grades of program encryptions and low-power consumption, the big electric current output of low level, low cost, ratio of performance to price height.

2, the anti-interference method that has adopted hardware watchdog circuit and software watchdog to combine, this machine functional reliability of making is guaranteed.

3, invented the AC power output soft starting circuit of the novel voltage-dropping type AC voltage-stabilizing circuit formed by AC power supply zero point testing circuit, output AC voltage analog-to-digital conversion high-accuracy sampling circuit, single chip microcomputer, photoelectrical coupler, power field effect pipe, AC/DC convertor etc. and restriction facsimile machine start surge current.This voltage stabilizing circuit is different from various voltage stabilizing circuit of the prior art, is characterized in when ac output voltage surpasses 220V, relies on the number that reduces half cycle of 50HZ AC power to realize exporting voltage stabilizing.

In the small-power alternating current steady voltage plug below 1000W, regulate the mode of autotransformer realization output voltage stabilizing with the dependence servo direct current motor that prior art extensively adopts and compare; Have that volume is little, in light weight, cost is low, simple in structure, remarkable advantage such as manufacture easily.With the size of control thyristor operating angle, carry out the mode of AC voltage-stabilizing and compare; Having does not have the high order harmonic component interference to AC network, belongs to the advantage of pure sine wave voltage stabilizing levelling.

When input ac power voltage is lower than 200 volts, because Switching Power Supply has voltage stabilizing levelling ability in the facsimile machine, so the present invention needn't carry out the low pressure voltage stabilizing.And when input ac voltage was higher than 220 volts, the switching loss of Switching Power Supply strengthened in the facsimile machine; When up to 240 volts when above, Switching Power Supply has worked in limiting value in the facsimile machine; As at this moment the AC power of supplying with facsimile machine not being carried out lowering and stabilizing blood pressure, especially start work under the environment of indoor high temperature in summer is easy to cause the damage of facsimile machine Switching Power Supply.This novel buck AC voltage-stabilizing circuit compared with prior art not only has the remarkable advantage that volume is little, in light weight, efficient is high, cost is low, manufacturing is simple and do not have the high order harmonic component interference, but also has the start soft start function.Therefore the technology of the present invention can ensure facsimile machine frequently start work and being without prejudice under the improper high pressure of AC network up to 270 volts.

4, invented New Type of Chip Microcomputer AT89C52 and made master controller, detected by ring, the simulation circuit for answering, CNG signal selective frequency amplifier circuit, double-tone is decoding circuit frequently, common fax, the telephone signal identification circuit of forming such as digital speech circuit.This identification circuit can not only be adapted to automatic facsimile machine station or artificial facsimile machine station etc., gives correct identification to the facsimile signal under the various conditions; And also can accurately discern telephone signal under the various conditions; And circuit is simple, cheap, easy to utilize.

5, having invented with the single-chip microcomputer is master controller, by 1 facsimile machine, the telephone set automatic control circuit of forming jointly with the low-cost simulation for SPC switching circuit of 4 simple types and AC power output circuit.It is not to adopt common ringing current generator that bell signal circuit in this control circuit, its ringing voltage produce; Face is to export 70 volts of 50HZ alternating voltages as ringing signal by a secondary winding of input power transformer, and circuit is simple like this, cost is low.The output of ringing voltage control simultaneously adopts relay and bidirectional triode thyristor combination to finish, and by the control of bidirectional triode thyristor as the output ringing voltage, bears control respectively to facsimile machine and 3 telephone sets by 4 relays.Utilize the Program time delay of single chip microcomputer AT89C52, when ring is exported, make relay action earlier, treat that its contact adhesive is good after, make the bidirectional triode thyristor conducting again, export 70 volts of ringing voltages to relay; When stopping ring output, close controllable silicon earlier, the back disconnects relay tip; Thereby make the adhesive under no-voltage of midget relay contact, disconnection, prevent that the frequent switching of contact produces spark so that damages under 70 volts of high voltages.

In the simulation for SPC switching circuit, the generation of sine wave signal sound (600HZ or other frequency) is the square-wave signal by single chip microcomputer output setpoint frequency; The 4 rank low pass filter frequency-selectings of being made up of the common double operational amplifier become pure sine wave then.This circuit is the sine wave signal of output frequency and range accuracy height, good stability not only, and circuit is simple, and is with low cost.

Claims (7)

1. an intelligent facsimile, telephone supervisor, it is characterized in that control circuit is that core constitutes with single chip microcomputer circuit (C), testing circuit (L), ringing-current circuit (J), direct inward dialing to extension autom circuit (I), music output circuit (Q) link to each other with comparator (H) frequently with facsimile signal interface circuit (M), extension interface circuit (N, O, P), exterior-line interface circuit (E), AC power output soft start and overpressure protection circuit (B), program control simulation switched circuit (K), anti-theft wire circuit (D), ring detecting circuit (F), double-tone respectively for it; Facsimile signal interface circuit (M), extension interface circuit (N, O, P) link to each other with ringing-current circuit (J) and program control simulation switched circuit (K) simultaneously; Exterior-line interface circuit (E) connects anti-theft wire circuit (D), ring detecting circuit (F) and signal amplification circuit (G); The output termination AC power output soft start and the overpressure protection circuit (B) of AC power input protection and low-voltage dc circuit (A); The output of direct inward dialing to extension autom circuit (I), music output circuit (Q) connects signal amplification circuit (G); Signal amplification circuit (G) also links to each other with comparator (H); Program control simulation switched circuit (K) is connected with double-tone frequency testing circuit (L).

2. the described intelligent facsimile of claim 1, telephone supervisor, it is characterized in that described master singlechip circuit (C), comprise single-chip microcomputer integrated circuit (IC1), exterior interrupt expanded circuit (IC2), the anti-jamming circuit of forming by monostable trigger (IC3) and the sinusoidal wave generation circuit of forming by single-chip microcomputer and dual operational amplifier (IC4).

3. the described intelligent facsimile of claim 1, telephone supervisor, it is characterized in that anti-lightning strike protection of described AC power and low-voltage dc circuit (A), comprise the lightning prevention circuit of forming by capacitor (C1, C2), inductance (LF1), piezo-resistance (VR1, VR2), the suspension low-voltage dc circuit of forming by transformer (T1N2), rectifier (BD1), capacitor (C4) and by transformer (T1N3), rectifier (BD2), diode (D1～D4), capacitor (C5～C8), the 12V that integrated regulator (IC6, IC7) is formed, the 5V direct current regulation circuit; Described AC power output soft start and overpressure protection circuit (B); comprise by transformer (T1N3); rectifier (BD2); resistor (R2～R5); diode (D2; D7); and the interchange zero-detection circuit of operational amplifier (IC5) composition; by transformer (T2); rectifier (BD4); resistor (R6～R10); capacitor (C9); the AC power output sampling circuit that diode (D6) and operational amplifier (IC5) are formed is by single-chip microcomputer (IC1); photoelectrical coupler (IC18); triode (V1); power field effect pipe (V2) and voltage-stabiliser tube (D5); current-limiting resistance (R12); output AC power source soft start and overpressure protection circuit that rectifier (BD3) is formed.

4. the described intelligent facsimile of claim 1, telephone supervisor is characterized in that (R28～R30), triode (V4, V5) constitute described exterior-line interface circuit (E) by diode (VR3), rectifier (BD5), resistor; Described ring detecting circuit (F) is made up of resistor (R31, R32), capacitor (C23), diode (D8); Steal line detection circuit and disturb line circuit described antitheft comprising with telephone line circuitry (D), wherein resistor (form and steal line detection circuit, the interference line circuit of being made up of resistor (R3), light-emitting diode (D9), triode (V6) by R34～R37), capacitor (C24, C25), voltage stabilizing didoe (D10) and operational amplifier (IC8a);

5. the described intelligence of claim 1, facsmile telephone supervisor is characterized in that described program control simulation switched circuit (K) is made of simulation switched integrated circuit (IC16); (R74～R76), form by capacitor (C43, C44) by dual-tone multifrequency receiving integrate circuit (IC17), resistor for described double-tone frequency testing circuit (L); Described ringing-current produces circuit (J), and (R14～R16), triode (V3), bidirectional triode thyristor (SCR1) are formed by power transformer (T1N4), resistor;

6. the described intelligent facsimile of claim 1, telephone supervisor is characterized in that ((form for R38～R50), capacitor by C26～C36), diode (D11) and conversation integrated circuit (IC9) by resistor for described signal amplification circuit (G); Described comparator circuit (H) is by operational amplifier (IC8b), resistor (R51～R53) constitute; Described direct inward dialing to extension autom circuit (I) comprises that (R54～R56), capacitor (C37) are formed for speech IC (IC10), resistor; Described music output circuit (Q) is made up of music integrated circuit (IC11) and resistor (R57).

7. the described intelligent facsimile of claim 1, telephone supervisor is characterized in that described extension interface circuit (N, O, P) is by signal deteching circuit, constant-current source circuit, control relay circuit and capacitor and telephone socket composition; Described facsimile signal interface circuit (M) is made up of input, constant-current source circuit, control relay circuit three parts and capacitor (C39), telephone socket (P3), wherein photoelectrical coupler (IC13) and resistor (R71) are formed signal deteching circuit, resistor (R60, R61), diode (D14, D15) and triode (V8) are formed constant-current source circuit, and resistor (R67), diode (D22), triode (V12), relay (J3) are formed control relay circuit.

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