CN2274393Y - Protector for facsimile apparatus - Google Patents

Abstract

The utility model relates to a fax machine protector. A ringing detecting circuit 1 is connected in parallel with telephone office lines LINE<1>12 and LINE<2>11, and is connected with a relay control circuit 5 which is connected with a relay JK<2>8. A normally open contact JK<2-2>10 of a relay JK<2> controls a power of a fax machine 7 to be switched on with signals and switched off with no signals. An electronic time-delay circuit 2 is connected with the relay control circuit 5. The protector is also provided with an on-hook detecting circuit 3, a voltage detecting circuit 4 and a line disturbing circuit 6. The utility model can save power and prolong service life for the fax machine, avoid lightning and prevent telephone lines from being stolen.

Description

The facsimile machine protector

The utility model relates to facsimile machine protector technical field.

The facsimile machine that uses start in 24 hours at present, but facsimile machine average operation time less than one hour, most of the time is in holding state, waste a large amount of electric energy, the components and parts acceleration component aging of switching on for a long time in the machine, shorten facsimile machine useful life, components and parts produce a large amount of heats and cause local overheating in the machine, cause fire easily, facsimile machine links to each other with electrical network for a long time, easily because of voltage ripple of power network causes damage, easilier, thunder and lightning suffer thunderbolt to cause machine breakdown because of sealing in electrical network, can not prevent that telephone line is stolen.

The purpose of this utility model provides a kind of facsimile machine protector, and this protector is connected the facsimile machine power circuit and made facsimile machine work when extraneous signal needs facsimile machine to accept, and the facsimile machine power circuit is cut off when no extraneous signal.

The utility model is achieved in that ring detecting circuit 1 and phone exchange line LINE ₁12 and phone exchange line LINE ₂11 parallel connections are connected with bang-bang circuit 5 then, bang-bang circuit 5 and relay J K ₂8 connect; Electronic delay circuit 2 is connected with bang-bang circuit 5, and on-hook detection circuit 3 is connected with circuit interfered circuit 6 with electronic delay circuit 2, on-hook detection circuit 3 and phone exchange line LINE ₂Meet the facsimile machine line TEL of facsimile machine 7 after 11 connections ₂14, the facsimile machine line TEL of facsimile machine 7 ₁The 13 exchange line LINE that answer the call ₁12, the power line of facsimile machine 7 and relay J K ₂Normally opened contact JK _2-210 connect relay J K ₂Normally-closed contact JK _2-19 connect AC power cord 15, and AC power cord 16 directly connects the power line of facsimile machine 7; Voltage detecting circuit 4 and phone exchange line LINE ₂11 and phone exchange line LINE ₁12 parallel connections are connected with circuit interfered circuit 6 then.

The utility model has the advantages that: the facsimile machine saves energy, the useful life of having improved facsimile machine, can be anti-lightning strike and stop circuit-line stolen.

Below in conjunction with accompanying drawing, the utility model is described further with embodiment:

Fig. 1 is a facsimile machine protector design principle block diagram;

Fig. 2 is facsimile machine protector circuit theory diagrams.

In the accompanying drawing: 1, ring detecting circuit, 2, electronic delay circuit, 3, on-hook detection circuit, 4, voltage detecting circuit, 5, bang-bang circuit, 6, the circuit interfered circuit, 7, facsimile machine, 8, relay J K ₂, 9, relay J K ₂Normally-closed contact JK _2-1, 10, relay J K ₂Normally opened contact JK _2-2, 11, phone exchange line LINE ₂, 12, phone exchange line LINE ₁, 13, facsimile machine line TEL ₁, 14, facsimile machine line TEL ₂, 15, AC power cord, 16, AC power cord.

Transformer T ₁, rectifier bridge B ₂And capacitor C ₅Form DC power supply, be used for the power supply of entire circuit, from the bell signal of telephone line through resistance R ₁₁, capacitor C ₆Step-down, rectifier bridge B ₃Output dc voltage after the rectification is through voltage-stabiliser tube ZW ₂Amplitude limit, capacitor C ₇Filtering, resistance R ₁₃Output to photoelectrical coupler O1 input after the current limliting, its output output low level RING signal triggers U ₁: 8 pin of B, U ₁: the upset of B internal circuit, 9 pin output high level is supplied with relay J K ₂8, relay J K ₂8 get electric adhesive, relay J K ₂Normally opened contact JK _2-210 adhesives, the power circuit of connecting facsimile machine 7 is series at the diode D in the telephone line for facsimile machine 7 work ₃, D ₄, D ₅And D ₆Detect local off hook state, as local off-hook, circuit has electric current to flow through, D ₃, D ₄, D ₅And D ₆Produce voltage drop, through resistance R ₁₄Be added to photoelectrical coupler O2 and O3 input, O2 and O3 input guarantee the randomness that circuit connects for oppositely to be connected, and O2 and O3 output low level are through diode D ₈And D ₉Isolate back output low level HOOK ₁And HOOK ₂Signal, HOOK ₁Signal is with capacitor C ₃Short circuit, delay circuit stops, and circuit keeps operating state, and when local on-hook, voltage drop disappears, photoelectrical coupler O2 and O3 output high-impedance state, the resistance R of electric current in delay circuit ₇Beginning is to capacitor C ₃C is worked as in charging ₃Voltage when being charged to predetermined value 2/3 supply voltage, trigger U ₁: the internal circuit of B makes U ₁: the 9 pin output low levels of B, relay J K ₂8 dead electricity, relay J K ₂Normally opened contact JK _2-210 disconnect, and facsimile machine 7 outages are quit work, and advance people's holding state; The piezo-resistance R of cross-over connection between AC power cord 15 and AC power cord 16 ₁₀And cross-over connection is in phone exchange line LINE ₁12 and phone exchange line LINE ₂Piezo-resistance R15 between 11 absorbs respectively from the lightning wave on the electrical network telephone wire, prevents that facsimile machine is damaged by thunderbolt.

Phone exchange line LINE ₂11 direct voltage is through rectifier bridge B ₁Adjust polarity, again through voltage-stabiliser tube ZW ₁Step-down, resistance R ₃Add to triode G after the current limliting ₁Base stage, make G ₁Collector electrode and emitter conducting, the collector electrode output low level is through diode D ₁And U ₁: 4 pin of A are low level, U ₁: A resets, by U ₁: A, R ₁, R ₂And C ₁The circuit interference oscillatory device that constitutes quits work U ₁: the 5 pin output low levels of A, the circuit state no interference signal, after stolen or line fault causes line voltage distribution to descend when circuit, voltage-stabiliser tube ZW ₁Do not end triode G because of there being enough puncture voltages ₁The base stage no current flows through, collector electrode output high level, U ₁: 4 pin of A uprise level, and the interference oscillatory device 5 pin output high-frequency square-wave signal of starting working is through resistance R ₅Drive triode G ₂Base stage is by G ₂Emitter exports square-wave signal to phone exchange line LINE ₁12 and phone exchange line LINE ₂11, interference is stolen the line dialing and is answered, prevent that circuit is stolen, the square-wave signal of 5 pin adds to buzzer BELL simultaneously, sends alarm signal, through resistance R 6 square-wave signal is added to LED 1 again, make the luminous warning of LED1, normally use circuit, then U1:A is resetted by low level HOOK2 signal as this locality, circuit interference oscillatory device is quit work, and circuit normally uses.

Claims (1)

1, facsimile machine protector is characterized in that: ring detecting circuit (1) and phone exchange line LINE ₂(11) and phone exchange line LINE ₁(12) parallel connection is connected with bang-bang circuit (5) then, bang-bang circuit (5) and relay J K ₂(8) connect; Electronic delay circuit (2) is connected with bang-bang circuit (5), and on-hook detection circuit (3) is connected with circuit interfered circuit (6) with electronic delay circuit (2), on-hook detection circuit (3) and phone exchange line LINE ₂(11) meet the facsimile machine line TEL of facsimile machine (7) after connecting ₂(14), the facsimile machine line TEL of facsimile machine (7) ₁(13) the exchange line LINE that answers the call ₁(12), the power line of facsimile machine (7) and relay J K ₂Normally opened contact JK _2-2(10) connect relay J K ₂Normally-closed contact JK _2-1(9) connect AC power cord (15), AC power cord (16) directly connects the power line of facsimile machine (7); Voltage detecting circuit (4) and phone exchange line LINE ₂(11) and phone exchange line LINE ₁(12) parallel connection is connected with circuit interfered circuit (6) then.