CN204408396U - There is the emergency communication host circuit of external call function - Google Patents

Abstract

The utility model discloses a kind of emergency communication host circuit with external call function, comprise power circuit, main frame inside and outside speaking circuit and talkback handle speaking circuit, power circuit comprises rechargeable battery, isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit, rechargeable battery, power supply switch circuit, battery charger, battery protecting circuit, battery voltage detection circuit, non-isolated Switching Power Supply booster circuit, linear voltage-stabilizing circuit and extension set voltage supply control circuit, main frame inside and outside speaking circuit comprises gsm module, SIM card holder, GSM antenna, watchdog circuit, reset circuit, speed signal processing circuit, distress call testing circuit, handle on-hook test button circuit, buzzer circuit, the low indicating circuit of battery electric quantity and GSM network signal indicating circuit.Circuit structure of the present utility model is simple, and it is convenient to realize, and voice response speed is fast, and can realize long haul communication, speech quality is high, and functional reliability is high, practical.

Description

There is the emergency communication host circuit of external call function

Technical field

The utility model belongs to emergency communication equipment technical field, especially relates to a kind of emergency communication host circuit with external call function.

Background technology

Along with developing rapidly of national economy, the Quantity of labour-intensive industrial and mining enterprises, industrial premises increases, urban population density sharply rises, high residential building constantly increases, emergency communication equipment in mine, tunnel, factory building, skyscraper, hoistway, confined space becomes the last line of defense of captive life, and therefore the performance of emergency communication equipment is particularly important to redemption life with use.

On existing market, the ripe emergency communication equipment used is generally direct press type intercom system, conducts as communication with electric wire or optical cable, and wire laying mode has built on stilts, underground, submarine cable and optical cable etc.It forms many innings of phone systems by emergency communication main frame and emergency communication extension set (one, each communication point device).On emergency communication main frame, each communication point arranges a call button, and each button is connected with corresponding communication point by call circuit, directly can directly call this point by this assignment key, mainly achieve the function of INCOM intercom, intuitively handy, but, also there is following defect and deficiency:

1, such emergency communication connected system, except sending words line, called line, line of unblanking, ground wire four bridging lines, each communication point needs a call connection line, connects up numerous and diverse, belongs to closed wiring and can not incorporate community comprehensive network; If calling distance location is long, monitoring is counted many, then cable wiring manufacture difficulty is larger, paving line long construction period, and outer payphone of dialling needs switching equipment, and line upkeep costly;

2, limited transmission distance, long haul communication signal attenuation is serious;

3, night shift room personnel must accomplish 24 hours on duty, urgent call in 24 hours cannot be realized, and cost of serving is high;

4, there is no SMS alarm function, do not accomplish that multimode reliability is reported to the police;

5, poor anti jamming capability, when there being external interference, it is unintelligible that speech quality can become, and cannot meet the demand of user;

6, product poor expandability, once system buildup is good, then the position of each side's emergency communication main frame and each side's communication point just cannot be changed, for follow-up place is flexible and transform circuit and cause very large cost hidden danger, and due to technical reason, product up-gradation or expansion have larger limitation.

Utility model content

Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, there is provided a kind of emergency communication host circuit with external call function, its structure is simple, reasonable in design, it is convenient to realize, voice response speed is fast, and can realize long haul communication, speech quality is high, functional reliability is high, the emergency communication main frame formed can realize urgent call in 24 hours, practical, is convenient to promote the use of.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of emergency communication host circuit with external call function, it is characterized in that: comprise power circuit, main frame inside and outside speaking circuit and talkback handle speaking circuit, described power circuit comprises rechargeable battery and the isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit for 220V alternating current being converted to+4.9V voltage, and for selecting 220V AC-powered or rechargeable battery powered and export the power supply switch circuit of+4.2V voltage, described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit and rechargeable battery all connect with power supply switch circuit, the output of described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit is connected to the battery charger connected with rechargeable battery, described battery is connected to for carrying out additives for overcharge protection to rechargeable battery, over, overcurrent protection, the battery protecting circuit of short-circuit protection and high temperature protection, the output of described rechargeable battery is connected to battery voltage detection circuit, the output of described power supply switch circuit is connected to power indicating circuit and the non-isolated Switching Power Supply booster circuit for by+4.2V voltage transitions being+12V voltage, the output of described non-isolated Switching Power Supply booster circuit divides two-way, one tunnel is connected to the linear voltage-stabilizing circuit for by+12V voltage transitions being+5V voltage, another road is connected to the extension set voltage supply control circuit exporting to emergency communication extension set for controlling+12V voltage,

The SIM card holder that described main frame inside and outside speaking circuit comprises gsm module and connects with described gsm module, GSM antenna, watchdog circuit, reset circuit and speed signal processing circuit, the output of described battery voltage detection circuit connects with the input of gsm module, the input of described gsm module is also connected to distress call testing circuit and handle on-hook test button circuit, described handle on-hook test button circuit is connected with talkback handle speaking circuit, described battery charger and extension set voltage supply control circuit all connect with the output of gsm module, the output of described gsm module is also connected to buzzer circuit, the low indicating circuit of battery electric quantity and GSM network signal indicating circuit, described speed signal processing circuit comprises output voice modulate circuit, input voice modulate circuit and anti-side-tone circuit, described output voice modulate circuit comprises the output voice isolation filter circuit connected successively, output audio resistance-capacitance coupling filter circuit and output audio amplifying circuit, described output voice isolation filter circuit connects with the output of gsm module, the output of described output audio amplifying circuit connects with anti-side-tone circuit, described input voice modulate circuit comprises the input voice resistance-capacitance coupling filter circuit connected successively, input voice filtering and amplifying circuit, input voice output buffer circuit and input voice isolation filter circuit, the input of described input voice resistance-capacitance coupling filter circuit connects with anti-side-tone circuit, the output of described input voice isolation filter circuit connects with the input of gsm module.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described gsm module is gsm module GU900Q, 1st pin of described gsm module GU900Q is by resistance R75 ground connection, 7th pin of described gsm module GU900Q is connected with the 15th pin of gsm module GU900Q by resistance R66, 15th pin of described gsm module GU900Q is by nonpolar electric capacity C62 in parallel and nonpolar electric capacity C63 ground connection, 34th pin of described gsm module GU900Q is connected with the 15th pin of gsm module GU900Q by resistance R79, 35th pin of described gsm module GU900Q is by resistance R78 ground connection, 26th pin of described gsm module GU900Q is by nonpolar electric capacity C61 ground connection, 55th ~ 57 pins of described gsm module GU900Q all connect with+4.2V the voltage output end of power supply switch circuit, and by nonpolar electric capacity C58 in parallel, nonpolar electric capacity C59, polar capacitor C60 and resistance R58 ground connection.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit comprises and has two pins and power supply terminal J9 for connecting 220V alternating current, chip VIPER22AS-E, light-coupled isolation chip JC817, three-terminal voltage-stabilizing chip CYT431A, rectifier DZ, there is the transformer T4 of a primary coil and two secondary coils, fast recovery diode D24, rectifier diode D29, polar capacitor C66 and Schottky diode D25, one end of the primary coil of described transformer T4 connects with the positive pole of the cathode voltage output of rectifier DZ and polar capacitor C66, and connected with the negative electrode of fast recovery diode D24 by resistance R84 in parallel and nonpolar electric capacity C67, an ac input end of described rectifier DZ connects with the 1st pin of power supply terminal J9, another ac input end of described rectifier DZ is connected with the 2nd pin of power supply terminal J9 by fuse F1, the cathode voltage output of described rectifier DZ and the equal ground connection of negative pole of polar capacitor C66, 5th pin of described chip VIPER22AS-E, 6th pin, 7th pin and the 8th pin all connect with the other end of the anode of fast recovery diode D24 and the primary coil of transformer T4, 1st pin of described chip VIPER22AS-E and the equal ground connection of the 2nd pin, 3rd pin of described chip VIPER22AS-E connects with the 3rd pin of chip JC817, and by nonpolar electric capacity C76 ground connection, 4th pin of described chip VIPER22AS-E is connected with the negative electrode of rectifier diode D29 by resistance R92, and connected with the 4th pin of chip JC817 by resistance R93, and by nonpolar electric capacity C77 ground connection, the anode of described rectifier diode D29 connects with one end of a secondary coil of described transformer T4, the other end ground connection of a secondary coil of described transformer T4, 1st pin of described chip JC817 is connected with the negative electrode of Schottky diode D25 by resistance R91, and connected with the 2nd pin of chip JC817 and the negative terminals of three-terminal voltage-stabilizing chip CYT431A by resistance R94, the positive terminal ground connection of described three-terminal voltage-stabilizing chip CYT431A, the Voltage Reference end of described three-terminal voltage-stabilizing chip CYT431A is connected with the negative electrode of Schottky diode D25 by resistance R95, and by resistance R97 ground connection, the anode of described Schottky diode D25 connects with one end of another secondary coil of transformer T4, and by series connection resistance R87 and nonpolar electric capacity C68 connect with the negative electrode of Schottky diode D25, the other end ground connection of another secondary coil of described transformer T4, the negative electrode of described Schottky diode D25 is the+4.9V voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit, and by polar capacitor C70 ground connection,

Described power supply switch circuit comprises PMOS Q14, rectifier diode D26 and fast recovery diode D35, the grid of described PMOS Q14 and the anode of rectifier diode D26 all connect with+4.9V the voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit, the drain electrode of described PMOS Q14 and the anode of fast recovery diode D35 all connect with the positive pole of rechargeable battery, and the source electrode of described PMOS Q14 and the negative electrode of fast recovery diode D35 all connect with the negative electrode of rectifier diode D26 and be+4.2V the voltage output end of power supply switch circuit;

Described power indicating circuit comprises light-emitting diode D2 and resistance R9, and the anode of described light-emitting diode D2 is connected with+4.2V the voltage output end of power supply switch circuit by resistance R9, the minus earth of described light-emitting diode D2;

Described non-isolated Boost circuit comprises switching power source chip MC34063A, Schottky diode D34 and polar capacitor C87, 8th pin of described switching power source chip MC34063A is connected with+4.2V the voltage output end of power supply switch circuit by the resistance R103 of series connection and resistance R104, 6th pin of described switching power source chip MC34063A connects with+4.2V the voltage output end of power supply switch circuit, 7th pin of described switching power source chip MC34063A connects with the link of resistance R103 and resistance R104, and connected with the 1st pin of switching power source chip MC34063A and the anode of Schottky diode D34 by inductance L 10, the negative electrode of described Schottky diode D34 is the+12V voltage output end of non-isolated Boost circuit and connects with the positive pole of polar capacitor C87, the minus earth of described polar capacitor C87, 5th pin of described switching power source chip MC34063A is by resistance R108 ground connection, and connected with the negative electrode of Schottky diode D34 by resistance R107, 3rd pin of described switching power source chip MC34063A is by nonpolar electric capacity C81 ground connection,

Described linear voltage-stabilizing circuit comprises voltage stabilizing chip LM7805, and the 1st pin of described voltage stabilizing chip LM7805 connects with+12V the voltage output end of non-isolated Boost circuit, and by nonpolar electric capacity C83 ground connection; The 2nd pin ground connection of described voltage stabilizing chip LM7805, the 3rd pin of described voltage stabilizing chip LM7805 is the+5V voltage output end of linear voltage-stabilizing circuit, and by nonpolar electric capacity C86 ground connection;

Described extension set voltage supply control circuit comprises triode Q1, triode Q17 and triode Q28, and for carrying out the light-emitting diode D1 of call signal instruction; The base stage of described triode Q1 is connected with the 7th pin of gsm module GU900Q by resistance R10, and by nonpolar electric capacity C3 ground connection, the grounded emitter of described triode Q1, the collector electrode of described triode Q1 is connected with the base stage of triode Q17 and the collector electrode of triode Q28 by resistance R68, and is connected with the negative electrode of light-emitting diode D1 by resistance R8; The emitter of described triode Q17 and the base stage of triode Q28 are all connected with+12V the voltage output end of non-isolated Switching Power Supply booster circuit by resistance R325, described light-emitting diode D1 connects with+12V the voltage output end of non-isolated Switching Power Supply booster circuit ,+12V the voltage output end of the current collection of described triode Q17 very extension set voltage supply control circuit.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described rechargeable battery is lithium battery BT1, described battery voltage detection circuit comprises resistance R99 and resistance R100, one end of described resistance R99 and one end of resistance R100 all connect with the 25th pin of gsm module GU900Q, the other end of described resistance R99 connects with the positive pole of lithium battery BT1, the other end ground connection of described resistance R100;

Described battery charger comprises triode Q15, triode Q16 and rectifier diode D33, the base stage of described triode Q16 is connected with the 41st pin of gsm module GU900Q by resistance R102, the grounded emitter of described triode Q16, the base stage of described triode Q15 is connected with the collector electrode of triode Q16 by resistance R101, the emitter of described triode Q15 connects with+4.9V the voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit, the collector electrode of described triode Q15 connects with the anode of rectifier diode D33, the negative electrode of described rectifier diode D33 is connected with the positive pole of lithium battery BT1 by resistance R98,

Described battery protecting circuit comprises Li battery protection IC DW01, NMOS tube Q15 and NMOS tube Q16, 5th pin of described Li battery protection IC DW01 is connected with the positive pole of lithium battery BT1 by resistance R109, and connected with the negative pole of lithium battery BT1 by nonpolar electric capacity C88, 6th pin of described Li battery protection IC DW01 and the source electrode of NMOS tube Q15 all connect with the negative pole of lithium battery BT1, 1st pin of described Li battery protection IC DW01 connects with the grid of NMOS tube Q15, 3rd pin of described Li battery protection IC DW01 connects with the grid of NMOS tube Q16, the drain electrode of described NMOS tube Q15 connects with the drain electrode of NMOS tube Q16, the source ground of described NMOS tube Q16, 2nd pin of described Li battery protection IC DW01 is by resistance R96 ground connection,

The low indicating circuit of described battery electric quantity comprises triode Q12 and is used to indicate the low light-emitting diode D20 of battery electric quantity, the base stage of described triode Q12 is connected with the 40th pin of gsm module GU900Q by resistance R71, and by nonpolar electric capacity C54 ground connection, the collector electrode of described triode Q12 is connected with the negative electrode of light-emitting diode D20 by resistance R64, the anode of described light-emitting diode D20 connects with+4.2V the voltage output end of power supply switch circuit, the grounded emitter of described triode Q12.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described GSM antenna connects with the 60th pin of gsm module GU900Q, described SIM card holder is SIM card holder ID1A-6S-2.54SF, 1st pin of described SIM card holder ID1A-6S-2.54SF connects with the 30th pin of gsm module GU900Q, and by nonpolar electric capacity C65 ground connection, 2nd pin of described SIM card holder ID1A-6S-2.54SF is connected with the 33rd pin of gsm module GU900Q by resistance R80, 3rd pin of described SIM card holder ID1A-6S-2.54SF is connected with the 32nd pin of gsm module GU900Q by resistance R81, the 4th pin ground connection of described SIM card holder ID1A-6S-2.54SF, 6th pin of described SIM card holder ID1A-6S-2.54SF is connected with the 31st pin of gsm module GU900Q by resistance R82,

Described watchdog circuit comprises chip PIC12F508,1st pin of described chip PIC12F508 connects with the 15th pin of gsm module GU900Q, 3rd pin of described chip PIC12F508 is connected with the 16th pin of gsm module GU900Q by resistance R77,4th pin of described chip PIC12F508 is connected with the 2nd pin of gsm module GU900Q by resistance R76, the 8th pin ground connection of described chip PIC12F508;

Described reset circuit is made up of reset key K2, resistance R118 and nonpolar electric capacity C89, one end of one end of described reset key K2, one end of resistance R118 and nonpolar electric capacity C89 all connects with the 16th pin of gsm module GU900Q, the other end of described resistance R118 connects with the 15th pin of gsm module GU900Q, the other end of described reset key K2 and the equal ground connection of the other end of nonpolar electric capacity C89;

Described GSM network signal indicating circuit comprises triode Q13 and is used to indicate the light-emitting diode D21 of GSM network signal, the base stage of described triode Q13 is connected with the 52nd pin of gsm module GU900Q by resistance R72, and by nonpolar electric capacity C55 ground connection, the collector electrode of described triode Q13 is connected with the negative electrode of light-emitting diode D21 by resistance R65, the anode of described light-emitting diode D21 connects with+4.2V the voltage output end of power supply switch circuit, the grounded emitter of described triode Q13;

Described buzzer circuit comprises buzzer LS2 and triode Q27, the base stage of described triode Q27 is connected with the 42nd pin of gsm module GU900Q by resistance R323, and by resistance R324 ground connection, the collector electrode of described triode Q27 connects with the negative pole of buzzer LS2, the positive pole of described buzzer LS2 connects with+4.2V the voltage output end of power supply switch circuit, the grounded emitter of described triode Q27.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described distress call testing circuit comprises extension set Interface Terminal J1, comparator chip LM393, diode D5, 1st pin of described extension set Interface Terminal J1 is extension set signal wire interface CH, 2nd pin of described extension set Interface Terminal J1 is extension set earth connection interface GND, 3rd pin of described extension set Interface Terminal J1 be+12V power cathode interface-, 4th pin of described extension set Interface Terminal J1 be+12V positive source interface+, 4th pin of described extension set Interface Terminal J1 is connected to the rectifier diode D30 that negative electrode connects with it, the anode of described rectifier diode D30 connects with+12V the voltage output end of extension set voltage supply control circuit, 2nd pin of described comparator chip LM393 connects with the positive pole of diode D5, and connected with+5V the voltage output end of linear voltage-stabilizing circuit by resistance R3 in parallel and nonpolar electric capacity C1, the negative electrode of described diode D5 is connected with the 1st pin of described extension set Interface Terminal J1 by the resistance R1 of series connection and inductance L 1, 3rd pin of described comparator chip LM393 is connected with+5V the voltage output end of linear voltage-stabilizing circuit by resistance R4, and by resistance R11 ground connection, 8th pin of described comparator chip LM393 connects with+5V the voltage output end of linear voltage-stabilizing circuit, the 4th pin ground connection of described comparator chip LM393, 1st pin of described comparator chip LM393 connects with the 3rd pin of gsm module GU900Q, and connected with the 15th pin of gsm module GU900Q by resistance R5.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described intercommunication button is button K1, one end of described button K1 connects with the 44th pin of gsm module GU900Q, and connected with the 15th pin of gsm module GU900Q by resistance R69, the other end ground connection of described button K1;

Described handle on-hook test button circuit comprises handle on-hook test button and polar capacitor C10, described handle on-hook test button is two single-pole double-throw switch (SPDT) SW1,1st pin of described couple of single-pole double-throw switch (SPDT) SW1, the 2nd pin and the 3rd pin are respectively the normal-closed end pin of an one single-pole double-throw switch (SPDT), Chang Kaiduan pin and common port pin, and the 4th pin of described couple of single-pole double-throw switch (SPDT) SW1, the 5th pin and the 6th pin are respectively the normal-closed end pin of its another single-pole double-throw switch (SPDT), Chang Kaiduan pin and common port pin; 1st pin of described couple of single-pole double-throw switch (SPDT) SW1 connects with+12V the voltage output end of extension set voltage supply control circuit, 3rd pin of described couple of single-pole double-throw switch (SPDT) SW1 is connected with the positive pole of polar capacitor C10 by resistance R6, the minus earth of described polar capacitor C10,5th pin of described couple of single-pole double-throw switch (SPDT) SW1 is connected with the 15th pin of gsm module GU900Q by resistance R85, and connected with the 48th pin of gsm module GU900Q by resistance R117, the 6th pin ground connection of described couple of single-pole double-throw switch (SPDT) SW1;

Described talkback handle speaking circuit comprises the talkback handle Interface Terminal J10 with four pins, transformer T5 and chip LM386, 1st pin of described talkback handle Interface Terminal J10 connects with the positive pole of the talkback handle internal loudspeaker of emergency communication main frame, 2nd pin of described talkback handle Interface Terminal J10 connects with the negative pole of the talkback handle internal loudspeaker of emergency communication main frame, 3rd pin of described talkback handle Interface Terminal J10 connects and ground connection with the negative pole of the talkback handle internal microphone of emergency communication main frame, 4th pin of described talkback handle Interface Terminal J10 connects with the positive pole of the talkback handle internal microphone of emergency communication main frame, 2nd pin of described chip LM386 is connected with the 4th pin of described talkback handle Interface Terminal J10 by nonpolar electric capacity C101, and by nonpolar electric capacity C100 ground connection, described nonpolar electric capacity C101 is connected with the positive pole of polar capacitor C10 by resistance R114 with the link of the 4th pin of described talkback handle Interface Terminal J10, and by nonpolar electric capacity C102 ground connection, 3rd pin of described chip LM386 and the equal ground connection of the 4th pin, 6th pin of described chip LM386 connects with the 3rd pin of described couple of single-pole double-throw switch (SPDT) SW1, and by polar capacitor C106 ground connection, 7th pin of described chip LM386 is by nonpolar electric capacity C80 ground connection, 1st pin of described chip LM386 be connected to the resistance R115 and nonpolar electric capacity C78 that connect between the 8th pin, 5th pin of described chip LM386 is connected with the centre tap of the primary coil of described transformer T5 by the polar capacitor C105 of series connection and resistance R74, the link of described polar capacitor C105 and resistance R74 is by nonpolar electric capacity C79 ground connection, one end of the primary coil of described transformer T5 connects with the 1st pin of described extension set Interface Terminal J1, and the other end of the primary coil of described transformer T5 passes through resistance R116 and the polar capacitor C92 ground connection of series connection, one end of the secondary coil of described transformer T5 is connected with the 2nd pin of talkback handle Interface Terminal J10 by resistance R13, and the other end of the secondary coil of described transformer T5 connects with the 1st pin of talkback handle Interface Terminal J10.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described anti-side-tone circuit comprises transformer T2, one end of the secondary coil of described transformer T2 connects with the 1st pin of extension set Interface Terminal J1, and the nonpolar electric capacity C32 by connecting successively, resistance R47, resistance R56 and resistance R61 connects with one end of the primary coil of described transformer T2, one end of the primary coil of described transformer T2 is also connected with the one end of the resistance R59 after parallel connection and one end of nonpolar electric capacity C53 by resistance R60, the other end ground connection of the resistance R59 after parallel connection and nonpolar electric capacity C53, the other end of the secondary coil of described transformer T2 connects with+12V the voltage output end of extension set voltage supply control circuit, and by polar capacitor C34 ground connection, the centre tap ground connection of the primary coil of described transformer T2, the other end of the primary coil of described transformer T2 is the speech signal input YI_IN of anti-side-tone circuit, the link of described resistance R47 and resistance R56 is the voice signal output YI_OUT of anti-side-tone circuit.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described output voice isolation filter circuit comprises transformer T1, one end of the primary coil of described transformer T1 is connected with the 22nd pin of gsm module GU900Q by inductance L 7, and by nonpolar electric capacity C16 in parallel and nonpolar electric capacity C17 ground connection; The other end of the primary coil of described transformer T1 is connected with the 21st pin of gsm module GU900Q by inductance L 8, and by nonpolar electric capacity C29 in parallel and nonpolar electric capacity C31 ground connection; Nonpolar electric capacity C22 in parallel and nonpolar electric capacity C23 is connected between the two ends of the primary coil of described transformer T1, one end of the secondary coil of described transformer T1 is the output exporting voice isolation filter circuit, the other end ground connection of the secondary coil of described transformer T1;

Described output audio resistance-capacitance coupling filter circuit comprises resistance R37, nonpolar electric capacity C19 and nonpolar electric capacity C21, one end of described resistance R37 and one end of nonpolar electric capacity C21 all connect with the output exporting voice isolation filter circuit, one end of described nonpolar electric capacity C19 connects with the other end of resistance R37, the other end of described nonpolar electric capacity C19 is the output of output audio resistance-capacitance coupling filter circuit, and by resistance R38 ground connection;

Described output audio amplifying circuit comprises chip TDA2003 and polar capacitor C20, 1st pin of described chip TDA2003 is connected with the output of output audio resistance-capacitance coupling filter circuit by nonpolar electric capacity C18, 2nd pin of described chip TDA2003 passes through nonpolar electric capacity C33 and the resistance R43 ground connection of series connection, 5th pin of described chip TDA2003 connects with+12V the voltage output end of extension set voltage supply control circuit, and by nonpolar electric capacity C25 ground connection, 3rd pin of described chip TDA2003 and the equal ground connection of the 6th pin, 4th pin of described chip TDA2003 connects with the positive pole of polar capacitor C20, and connected with the link of nonpolar electric capacity C33 and resistance R43 by resistance R39, the negative pole of described polar capacitor C20 connects with the speech signal input YI_IN of anti-side-tone circuit, and pass through nonpolar electric capacity C24 and the resistance R41 ground connection of series connection.

The above-mentioned emergency communication host circuit with external call function, it is characterized in that: described input voice resistance-capacitance coupling filter circuit comprises resistance R55, nonpolar electric capacity C39 and nonpolar electric capacity C43, one end of described nonpolar electric capacity C39 connects with the voice signal output YI_OUT of anti-side-tone circuit, and the other end of described nonpolar electric capacity C39 passes through the resistance R55 of series connection and nonpolar electric capacity C43 ground connection;

Described input voice filtering and amplifying circuit comprises the operational amplifier U5A in operational amplifier chip LM358,8th pin of described operational amplifier chip LM358 is connected with+5V the voltage output end of linear voltage-stabilizing circuit by resistance R44, and by nonpolar electric capacity C37 ground connection, the 4th pin ground connection of described operational amplifier chip LM358, the in-phase input end of described operational amplifier U5A is connected with+5V the voltage output end of linear voltage-stabilizing circuit by resistance R48, and by resistance R51 ground connection, the inverting input of described operational amplifier U5A is connected with the link of resistance R55 and nonpolar electric capacity C43 by resistance R52, and by nonpolar electric capacity C44 ground connection, resistance R62 is connected between the output of described operational amplifier U5A and inverting input, the inverting input of described operational amplifier U5A passes through nonpolar electric capacity C51 and the resistance R63 ground connection of series connection, the output of described operational amplifier U5A is connected with the link of nonpolar electric capacity C51 and resistance R63 by nonpolar electric capacity C52 with the link of resistance R62, the output of described operational amplifier U5A also connects with one end of the resistance R53 after parallel connection and nonpolar electric capacity C42, the other end of the resistance R53 after parallel connection and nonpolar electric capacity C42 is the output of input voice filtering and amplifying circuit,

Described input voice output buffer circuit comprises the operational amplifier U5B in operational amplifier chip LM358, the in-phase input end of described operational amplifier U5B is connected with the output of input voice filtering and amplifying circuit by resistance R54, the output of described operational amplifier U5B is the output of input voice output buffer circuit, and connect with the inverting input of operational amplifier U5B, and connected with one end of the nonpolar electric capacity C45 after parallel connection and resistance R57 by nonpolar electric capacity C41; Nonpolar electric capacity C45 after parallel connection and the other end ground connection of resistance R57;

Described input voice isolation filter circuit comprises transformer T3, one end of primary coil of described transformer T3 connects with the output of input voice output buffer circuit, the other end ground connection of the primary coil of described transformer T3, one end of the secondary coil of described transformer T3 connects with the 19th pin of gsm module GU900Q, and by nonpolar electric capacity C40 in parallel and nonpolar electric capacity C38 ground connection; The other end of the secondary coil of described transformer T3 connects with the 20th pin of gsm module GU900Q; And by nonpolar electric capacity C48 in parallel and nonpolar electric capacity C49 ground connection, between the two ends of the secondary coil of described transformer T3, be connected to nonpolar electric capacity C46 in parallel and nonpolar electric capacity C47.

The utility model compared with prior art has the following advantages:

1, the utility model circuit structure is simple, reasonable in design, and realization is convenient and cost is low.

2, the utility model is on the basis with INCOM intercom function, also be provided with external call function, inner intercommunication call function and outside intercommunication call function have been carried out effectively combining, outside intercommunication call realizes based on GSM network, wireless talkback side is not by region, the restriction of occasion, mine can be arranged on, tunnel, in factory building, in skyscraper, hoistway, in confined space etc., and install and line upkeep without the need to wiring, as long as when there being good GSM quorum sensing inhibitor, all external call can be carried out, there is very large convenience, rescue party can be expanded to the mobile phone of movement by the night shift room fixed, considerably increase rescue efficiency and reliability.

3, the utility model have employed gsm module GU900Q and chip TDA2003 processes voice signal, and voice response speed is fast, and filter effect is obvious, and functional reliability is high.

4, distress call testing circuit of the present utility model can make fast reaction by comparator chip LM393 to the calling action from call button, and send to gsm module in real time, facilitate staff and can take corresponding rescue measure in time rapidly, reduce the life danger of user.

5, the antijamming capability of the utility model speed signal processing circuit is strong, effectively can ensure speech quality, and it is low to realize cost when there being external interference, functional reliability and job stability high.

6, power circuit of the present utility model can realize uninterrupted power supply, operating efficiency and functional reliability high, after power-off, earthquake etc. in major accident, namely when outside does not have 220V alternating current to supply, by the deposit of rechargeable battery electric energy, reliably working more than 12 hours under the state of emergency can be ensured.

7, the emergency communication main frame adopting the utility model circuit to form, transmission range is unrestricted, can realize long haul communication by GSM network.

8, the emergency communication main frame adopting the utility model circuit to form, coordinate emergency communication extension set of the prior art, after external mobile telephone (mobile phone) forms emergency communication system, on duty without the need to night shift room personnel 24 hours, urgent call in 24 hours can be realized, and cost of serving is low.

9, the utility model is owing to being provided with gsm module, therefore after secondary development expansion, can also realize SMS alarm function, provides convenience for accomplishing that multimode reliability is reported to the police.

10, the emergency communication main frame adopting the utility model circuit to form, coordinate emergency communication extension set of the prior art, after external mobile telephone (mobile phone) forms emergency communication system, the system expandability is good, external mobile telephone (mobile phone) can move everywhere, without the need to carrying out troublesome track remodelling, system upgrade or expand unrestricted.

11, of the present utility model practical, result of use is good, is convenient to promote the use of.

In sum, the utility model circuit structure is simple, reasonable in design, and it is convenient to realize, voice response speed is fast, and can realize long haul communication, speech quality is high, and functional reliability is high, the emergency communication main frame formed can realize urgent call in 24 hours, practical, is convenient to promote the use of.

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Accompanying drawing explanation

Fig. 1 is schematic block circuit diagram of the present utility model.

Fig. 2 is the circuit theory diagrams of the isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit of utility model.

Fig. 3 is the circuit connecting relation schematic diagram of utility model rechargeable battery, power supply switch circuit, power indicating circuit, battery charger, battery protecting circuit and battery voltage detection circuit.

Fig. 4 is the circuit connecting relation schematic diagram of the non-isolated Switching Power Supply booster circuit of utility model, linear voltage-stabilizing circuit and extension set voltage supply control circuit.

Fig. 5 is the circuit connecting relation schematic diagram of the utility model gsm module and intercommunication button.

Fig. 6 is the circuit theory diagrams of the low indicating circuit of the utility model battery electric quantity.

Fig. 7 is the circuit theory diagrams of the utility model SIM card holder.

Fig. 8 is the circuit connecting relation schematic diagram of the utility model watchdog circuit and reset circuit.

Fig. 9 is the circuit theory diagrams of the utility model GSM network signal indicating circuit.

Figure 10 is the circuit theory diagrams of the utility model buzzer circuit.

Figure 11 is the circuit connecting relation schematic diagram of the utility model distress call testing circuit and extension set Interface Terminal.

Figure 12 is the circuit connecting relation schematic diagram of the utility model talkback handle Interface Terminal and talkback handle speaking circuit.

Figure 13 is the circuit theory diagrams of the utility model handle on-hook test button circuit.

Figure 14 is the circuit theory diagrams of the utility model anti-side-tone circuit.

Figure 15 is the circuit connecting relation schematic diagram that the utility model exports voice isolation filter circuit, output audio resistance-capacitance coupling filter circuit and output audio amplifying circuit.

Figure 16 is the circuit connecting relation schematic diagram of the utility model input voice resistance-capacitance coupling filter circuit, input voice filtering and amplifying circuit, input voice output buffer circuit and input voice isolation filter circuit.

Description of reference numerals:

4-talkback handle speaking circuit; 6-rechargeable battery;

7-isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit; 8-power supply switch circuit;

9-battery charger; 10-battery protecting circuit; 11-battery voltage detection circuit;

12-power indicating circuit; 13-non-isolated Switching Power Supply booster circuit;

14-power indicating circuit; 15-linear voltage-stabilizing circuit;

16-extension set voltage supply control circuit; 18-gsm module;

19-distress call testing circuit; 20-GSM antenna;

21-watchdog circuit; 22-reset circuit; 23-GSM network signal indicating circuit;

26-export voice isolation filter circuit; 27-output audio resistance-capacitance coupling filter circuit;

28-output audio amplifying circuit; 29-input voice resistance-capacitance coupling filter circuit;

30-input voice filtering and amplifying circuit; 31-input voice output buffer circuit;

32-input voice isolation filter circuit; 39-buzzer circuit;

The low indicating circuit of 40-battery electric quantity; 41-anti-side-tone circuit;

42-handle on-hook test button circuit.

Embodiment

As shown in Figure 1, the utility model comprises power circuit, main frame inside and outside speaking circuit and talkback handle speaking circuit 4, described power circuit comprises rechargeable battery 6 and the isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7 for 220V alternating current being converted to+4.9V voltage, and for selecting 220V AC-powered or rechargeable battery 6 to power and exporting the power supply switch circuit 8 of+4.2V voltage, described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7 and rechargeable battery 6 all connect with power supply switch circuit 8, the output of described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7 is connected to the battery charger 9 connected with rechargeable battery 6, described battery is connected to for carrying out additives for overcharge protection to rechargeable battery 6, over, overcurrent protection, the battery protecting circuit 10 of short-circuit protection and high temperature protection, the output of described rechargeable battery 6 is connected to battery voltage detection circuit 11, the output of described power supply switch circuit 8 is connected to power indicating circuit 12 and the non-isolated Switching Power Supply booster circuit 13 for by+4.2V voltage transitions being+12V voltage, the output of described non-isolated Switching Power Supply booster circuit 13 divides two-way, one tunnel is connected to the linear voltage-stabilizing circuit 15 for by+12V voltage transitions being+5V voltage, another road is connected to the extension set voltage supply control circuit 16 exporting to emergency communication extension set for controlling+12V voltage,

As shown in Figure 1, the SIM card holder 44 that described main frame inside and outside speaking circuit comprises gsm module 18 and connects with described gsm module 18, GSM antenna 20, watchdog circuit 21, reset circuit 22 and speed signal processing circuit, the output of described battery voltage detection circuit 11 connects with the input of gsm module 18, the input of described gsm module 18 is also connected to distress call testing circuit 19 and handle on-hook test button circuit 42, described handle on-hook test button circuit 42 is connected with talkback handle speaking circuit 4, described battery charger 9 and extension set voltage supply control circuit 16 all connect with the output of gsm module 18, the output of described gsm module 18 is also connected to buzzer circuit 39, the low indicating circuit 40 of battery electric quantity and GSM network signal indicating circuit 23, described speed signal processing circuit comprises output voice modulate circuit, input voice modulate circuit and anti-side-tone circuit 41, described output voice modulate circuit comprises the output voice isolation filter circuit 26 connected successively, output audio resistance-capacitance coupling filter circuit 27 and output audio amplifying circuit 28, described output voice isolation filter circuit 26 connects with the output of gsm module 18, the output of described output audio amplifying circuit 28 connects with anti-side-tone circuit 41, described input voice modulate circuit comprises the input voice resistance-capacitance coupling filter circuit 29 connected successively, input voice filtering and amplifying circuit 30, input voice output buffer circuit 31 and input voice isolation filter circuit 32, the input of described input voice resistance-capacitance coupling filter circuit 29 connects with anti-side-tone circuit 41, the output of described input voice isolation filter circuit 32 connects with the input of gsm module 18.During concrete enforcement, emergency communication extension set is connected with emergency communication main frame by extension set holding wire (two diameters are not less than the copper core cable of 2mm).

Described power circuit can realize uninterrupted power supply, whole emergency communication main frame mainly contains three kinds of different voltage value, one is the supply power voltage of+12V, is mainly used in powering to each emergency communication extension set in the handle on-hook test button circuit 42 of emergency communication main frame, anti-side-tone circuit 41 and output audio amplifying circuit 28 and emergency communication system, another is the supply power voltage of+5V, is mainly used in powering to distress call testing circuit 19 and input voice filtering and amplifying circuit 30, 3rd is the supply power voltage of+4.2V, it is mainly used in powering to gsm module 18, because gsm module 18 is in long-term work state, require higher for power supply conversion efficiency, so adopt isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7 that 220V alternating current is converted to+4.9V voltage, 220V AC-powered or rechargeable battery 6 is selected to power by power supply switch circuit 8 again, while improve power work efficiency, improve the reliability of power supply, when outside does not have 220V alternating current to supply by the deposit of rechargeable battery 6 electric energy, reliably working more than 12 hours under the state of emergency can be ensured.Specifically, the operation principle of described power circuit is: when there being 220V alternating current to supply, 220V alternating current is through the step-down of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7, export+4.9V voltage and be divided into two-way, charge for rechargeable battery 6 through battery charger 9 in one tunnel, another road is converted to after+4.2V voltage through power supply switch circuit 8 and is further divided into two-way, one tunnel powers to gsm module 18, another road leads to non-isolated Boost circuit 13 and boosts to+12V voltage, then+12V voltage is divided into two-way to export, the first via is to the handle on-hook test button circuit 42 of emergency communication main frame, each emergency communication extension set in anti-side-tone circuit 41 and output audio amplifying circuit 28 and emergency communication system is powered, another road is converted to after+5V voltage as distress call testing circuit 19 and input voice filtering and amplifying circuit 30 are powered through linear voltage-stabilizing circuit, when not having 220V alternating current to supply, rechargeable battery 6 discharges, and power supply switch circuit 8 selects rechargeable battery 6 for emergency communication host supplying power, and concrete system power flow topological relation is with 220V AC-powered.

As shown in Figure 5, in the present embodiment, described gsm module 18 is gsm module GU900Q, 1st pin of described gsm module GU900Q is by resistance R75 ground connection, 7th pin of described gsm module GU900Q is connected with the 15th pin of gsm module GU900Q by resistance R66, 15th pin of described gsm module GU900Q is by nonpolar electric capacity C62 in parallel and nonpolar electric capacity C63 ground connection, 34th pin of described gsm module GU900Q is connected with the 15th pin of gsm module GU900Q by resistance R79, 35th pin of described gsm module GU900Q is by resistance R78 ground connection, 26th pin of described gsm module GU900Q is by nonpolar electric capacity C61 ground connection, 55th ~ 57 pins of described gsm module GU900Q all connect with+4.2V the voltage output end of power supply switch circuit 8, and by nonpolar electric capacity C58 in parallel, nonpolar electric capacity C59, polar capacitor C60 and resistance R58 ground connection.Gsm module GU900Q is the GSM/GPRS wireless module of a support two-band 900MHz/1800MHz, and volume is little, and integrated level is high, supports multi-link; The maximum electric current of work is 220mA, and standby current is little causes 1.2mA; Operating voltage is direct current 3.5V to 4.5V; In acoustic processing, support the functions such as recording and echo suppression, the control of voice output size, user demand of the present utility model can be met well.1st pin of described gsm module GU900Q is start control pin, and after powering on, the 1st pin level of described gsm module GU900Q is automatically pulled low by resistance R75, thus startup gsm module GU900Q carries out work.15th pin of gsm module GU900Q is the 2.8V linear voltage source output interface of gsm module GU900Q, maximum output current is 80mA, the 2.8V linear voltage exported can be used as the I/O interface level translation voltage source of gsm module GU900Q, such as, 7th pin of described gsm module GU900Q is connected to this 2.8V linear voltage source by pull-up resistor R66, and the 34th pin of described gsm module GU900Q is connected to this 2.8V linear voltage source by pull-up resistor R79.

As shown in Figure 2, in the present embodiment, described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7 comprises and has two pins and power supply terminal J9 for connecting 220V alternating current, chip VIPER22AS-E, light-coupled isolation chip JC817, three-terminal voltage-stabilizing chip CYT431A, rectifier DZ, there is the transformer T4 of a primary coil and two secondary coils, fast recovery diode D24, rectifier diode D29, polar capacitor C66 and Schottky diode D25, one end of the primary coil of described transformer T4 connects with the positive pole of the cathode voltage output of rectifier DZ and polar capacitor C66, and connected with the negative electrode of fast recovery diode D24 by resistance R84 in parallel and nonpolar electric capacity C67, an ac input end of described rectifier DZ connects with the 1st pin of power supply terminal J9, another ac input end of described rectifier DZ is connected with the 2nd pin of power supply terminal J9 by fuse F1, the cathode voltage output of described rectifier DZ and the equal ground connection of negative pole of polar capacitor C66, 5th pin of described chip VIPER22AS-E, 6th pin, 7th pin and the 8th pin all connect with the other end of the anode of fast recovery diode D24 and the primary coil of transformer T4, 1st pin of described chip VIPER22AS-E and the equal ground connection of the 2nd pin, 3rd pin of described chip VIPER22AS-E connects with the 3rd pin of chip JC817, and by nonpolar electric capacity C76 ground connection, 4th pin of described chip VIPER22AS-E is connected with the negative electrode of rectifier diode D29 by resistance R92, and connected with the 4th pin of chip JC817 by resistance R93, and by nonpolar electric capacity C77 ground connection, the anode of described rectifier diode D29 connects with one end of a secondary coil of described transformer T4, the other end ground connection of a secondary coil of described transformer T4, 1st pin of described chip JC817 is connected with the negative electrode of Schottky diode D25 by resistance R91, and connected with the 2nd pin of chip JC817 and the negative terminals of three-terminal voltage-stabilizing chip CYT431A by resistance R94, the positive terminal ground connection of described three-terminal voltage-stabilizing chip CYT431A, the Voltage Reference end of described three-terminal voltage-stabilizing chip CYT431A is connected with the negative electrode of Schottky diode D25 by resistance R95, and by resistance R97 ground connection, the anode of described Schottky diode D25 connects with one end of another secondary coil of transformer T4, and by series connection resistance R87 and nonpolar electric capacity C68 connect with the negative electrode of Schottky diode D25, the other end ground connection of another secondary coil of described transformer T4, the negative electrode of described Schottky diode D25 is the+4.9V voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7, and by polar capacitor C70 ground connection, 220V alternating current is introduced from power supply terminal J9, after rectifying and wave-filtering, input voltage is added on the primary coil (coil between pin 1 and 2) of transformer T4, 5th pin of chip VIPER22AS-E, 6th pin, 7th pin and the 8th pin are the drain electrode input of the inner metal-oxide-semiconductor of chip VIPER22AS-E, when the inner metal-oxide-semiconductor conducting of chip VIPER22AS-E, the primary current of transformer T4 linearly increases, transformer T4 converts electrical energy into Magnetic Energy Storage wherein, the Same Name of Ends of a secondary coil (coil between pin 4 and 5) of transformer T4 is contrary with the Same Name of Ends of this primary coil, Schottky diode D29 is ended because of reverse-biased, this secondary coil no current of transformer T4 flows through, not for chip VIPER22AS-E provides power supply, when the inner metal-oxide-semiconductor of chip VIPER22AS-E turns off, the primary current vanishing of transformer T4, this secondary coil induced voltage of transformer T4 makes Schottky diode D29 positively biased and conducting, be stored in magnetic energy in a primary coil of transformer T4 by Mutual Inductance Coupling in this secondary coil, transformer T4 releases energy, this secondary current of transformer T4 linearly reduces, for chip VIPER22AS-E provides power supply.Simultaneously, when the inner metal-oxide-semiconductor conducting of chip VIPER22AS-E, the primary current of transformer T4 linearly increases, transformer T4 converts electrical energy into Magnetic Energy Storage wherein, the Same Name of Ends of another secondary coil (coil between pin 10 and 6) of transformer T4 is contrary with the Same Name of Ends of this primary coil, Schottky diode D25 is ended because of reverse-biased, and this secondary coil no current of transformer T4 flows through, and load only provides electric energy by nonpolar electric capacity C70; When the inner metal-oxide-semiconductor of chip VIPER22AS-E turns off, the primary current vanishing of transformer T4, this secondary coil induced voltage of transformer T4 makes Schottky diode D25 positively biased and conducting, be stored in magnetic energy in the primary coil of transformer T4 by Mutual Inductance Coupling in secondary coil, transformer T4 releases energy, this secondary current of transformer T4 linearly reduces, and voltage is now and exports endlessly to rear class.In addition, the feedback of chip VIPER22AS-E also another secondary coil (coil between the pin 10 and 6) output voltage of receiving transformer T4, thus the adjustment of transformer T4 output voltage in a stable value, concrete feedback principle is: when transformer T4 output voltage raises suddenly, because resistance R95 and resistance R97 connects connection on the output voltage, therefore dividing potential drop also raises, partial pressure value is input to the Voltage Reference end of three-terminal voltage-stabilizing chip CYT431A, the conducting degree of three-terminal voltage-stabilizing chip CYT431A just increases, the diode end conducting of light-coupled isolation chip JC817 inside immediately increases, and then, the feedback reception end of chip VIPER22AS-E, namely the electric current of the 3rd pin increases, the duty cycle of switching of the inner metal-oxide-semiconductor of chip VIPER22AS-E is now made to decline, the energy that transformer T4 is coupled declines, so just complete the reduction of output voltage, this is a complete degenerative process, if output voltage reduces, so the switch PWM ripple duty ratio of the inner metal-oxide-semiconductor of chip VIPER22AS-E increases, just increase output voltage immediately.

As shown in Figure 3, in the present embodiment, described power supply switch circuit 8 comprises PMOS Q14, rectifier diode D26 and fast recovery diode D35, the grid of described PMOS Q14 and the anode of rectifier diode D26 all connect with+4.9V the voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7, the drain electrode of described PMOS Q14 and the anode of fast recovery diode D35 all connect with the positive pole of rechargeable battery 6, the source electrode of described PMOS Q14 and the negative electrode of fast recovery diode D35 all connect with the negative electrode of rectifier diode D26 and are+4.2V the voltage output end of power supply switch circuit 8, when there being 220V alternating current to access from power supply terminal 34, there is+4.9V voltage in the anode of rectifier diode D26, after the 0.7V pressure drop of rectifier diode D26, becomes+4.2V, export from the negative electrode of rectifier diode D26, and supply subsequent conditioning circuit uses, now, the grid of PMOS Q14 is high level, and the voltage difference between the grid of PMOS Q14 and source electrode is less than the threshold voltage of PMOS Q14 conducting, and PMOS Q14 ends, and now the discharge loop of rechargeable battery 6 is truncated, and rechargeable battery 6 does not discharge.When 220V alternating current breaks suddenly, the anode voltage of rectifier diode D26 is becoming 0 instantaneously, now PMOS Q14 conducting, and by rechargeable battery 6 for subsequent conditioning circuit is powered, wherein, fast recovery diode D35 can add for the discharge loop of rechargeable battery 6 by Quick.

As shown in Figure 3, in the present embodiment, described power indicating circuit 12 comprises light-emitting diode D2 and resistance R9, and the anode of described light-emitting diode D2 is connected with+4.2V the voltage output end of power supply switch circuit 8 by resistance R9, the minus earth of described light-emitting diode D2;

As shown in Figure 4, in the present embodiment, described non-isolated Boost circuit 13 comprises switching power source chip MC34063A, Schottky diode D34 and polar capacitor C87, 8th pin of described switching power source chip MC34063A is connected with+4.2V the voltage output end of power supply switch circuit 8 by the resistance R103 of series connection and resistance R104, 6th pin of described switching power source chip MC34063A connects with+4.2V the voltage output end of power supply switch circuit 8, 7th pin of described switching power source chip MC34063A connects with the link of resistance R103 and resistance R104, and connected with the 1st pin of switching power source chip MC34063A and the anode of Schottky diode D34 by inductance L 10, the negative electrode of described Schottky diode D34 is the+12V voltage output end of non-isolated Boos t booster circuit 13 and connects with the positive pole of polar capacitor C87, the minus earth of described polar capacitor C87, 5th pin of described switching power source chip MC34063A is by resistance R108 ground connection, and connected with the negative electrode of Schottky diode D34 by resistance R107, 3rd pin of described switching power source chip MC34063A is by nonpolar electric capacity C81 ground connection, 1st pin of switching power source chip MC34063A is the drain electrode of chip internal switch MOS pipe, when the pipe conducting of chip internal switch MOS, namely the 1st pin of switching power source chip MC34063A is when inner conducting, power supply (i.e. power supply switch circuit 8 export+4.2V voltage) is through the 1st pin of resistance R104 and inductance L 10 and switching power source chip MC34063A and the 2nd pin ground connection, now inductance L 10 starts stored energy, and by polar capacitor C87 for load provides energy, when chip internal switch MOS pipe disconnects, power supply (i.e.+4.2V voltage of power supply switch circuit 8 output) and inductance L 10 provide energy to load and polar capacitor C87 simultaneously.Inductance L 10 is in the period section that releases energy, because electromotive force polarity and connect power supply (i.e. power supply switch circuit 8 the export+4.2V voltage) polarity at inductance L 10 two ends is identical, be equivalent to two voltage source series connection, so the voltage that load obtains is higher than power supply (i.e.+4.2V voltage of power supply switch circuit 8 output) voltage, the frequency of this circuit chip internal switch metal-oxide-semiconductor conducting and shutoff is called the operating frequency of switching power source chip MC34063A, the time constant of this frequency relative load is enough high, so load can obtain continuous print direct voltage.

As shown in Figure 4, in the present embodiment, described linear voltage-stabilizing circuit 15 comprises voltage stabilizing chip LM7805, and the 1st pin of described voltage stabilizing chip LM7805 connects with+12V the voltage output end of non-isolated Boos t booster circuit 13, and by nonpolar electric capacity C83 ground connection; The 2nd pin ground connection of described voltage stabilizing chip LM7805, the 3rd pin of described voltage stabilizing chip LM7805 is the+5V voltage output end of linear voltage-stabilizing circuit 15, and by nonpolar electric capacity C86 ground connection; Described linear voltage-stabilizing circuit 15 is for the operational amplifier chip LM358 in the comparator chip LM393 in distress call testing circuit 19 and input voice filtering and amplifying circuit 30 powers, the rated disspation of comparator chip LM393 and operational amplifier chip LM358 is 0.5W, so the power consumption of comparator chip LM393 and operational amplifier chip LM358 entirety is very low, only has 1W; From+12V voltage to the voltage transitions of+5V voltage, the conversion efficiency for power supply is less demanding, but requires that power supply noise is little, so adopt voltage stabilizing chip LM7805, can obtain reliable and stable, the little+5V voltage output of noise; The stability of voltage stabilizing chip LM7805 is high, and be easy to buying, low price, maximum power dissipation can reach 7.5W, but also has overload protection and short-circuit protection function.

As shown in Figure 4, in the present embodiment, described extension set voltage supply control circuit 16 comprises triode Q1, triode Q17 and triode Q28, and for carrying out the light-emitting diode D1 of call signal instruction; The base stage of described triode Q1 is connected with the 7th pin of gsm module GU900Q by resistance R10, and by nonpolar electric capacity C3 ground connection, the grounded emitter of described triode Q1, the collector electrode of described triode Q1 is connected with the base stage of triode Q17 and the collector electrode of triode Q28 by resistance R68, and is connected with the negative electrode of light-emitting diode D1 by resistance R8; The emitter of described triode Q17 and the base stage of triode Q28 are all connected with+12V the voltage output end of non-isolated Switching Power Supply booster circuit 13 by resistance R325, described light-emitting diode D1 connects with+12V the voltage output end of non-isolated Switching Power Supply booster circuit 13 ,+12V the voltage output end of the current collection of described triode Q17 very extension set voltage supply control circuit 16.Extension set voltage supply control circuit 16 is keys that between emergency communication main frame and emergency communication extension set, power supply is communicated with, and can be controlled the power supply of emergency communication extension set by extension set voltage supply control circuit 16; Specifically, when the 7th pin output low level of gsm module GU900Q, triode Q1 is in cut-off state, now triode Q17 does not have bias voltage to produce, thus make triode Q17 also be in cut-off state, + 12V the voltage that now non-isolated Boos t booster circuit 13 exports cannot be transferred to the collector electrode of triode Q17, i.e. the output of extension set voltage supply control circuit 16, and emergency communication main frame and emergency communication extension set are in holding state; When the 7th pin of gsm module GU900Q exports high level, triode Q1 is in conducting state, now triode Q17 has enough bias voltage generations, thus make triode Q17 also be in conducting state, + 12V the voltage that now non-isolated Boost circuit 13 exports can be transferred to the collector electrode of triode Q17, the i.e. output of extension set voltage supply control circuit 16, can power for late-class circuit.

As shown in Figure 3, in the present embodiment, described rechargeable battery 6 is lithium battery BT1, described battery voltage detection circuit 11 comprises resistance R99 and resistance R100, one end of described resistance R99 and one end of resistance R100 all connect with the 25th pin of gsm module GU900Q, the other end of described resistance R99 connects with the positive pole of lithium battery BT1, the other end ground connection of described resistance R100;

As shown in Figure 3, in the present embodiment, described battery charger 9 comprises triode Q15, triode Q16 and rectifier diode D33, the base stage of described triode Q16 is connected with the 41st pin of gsm module GU900Q by resistance R102, the grounded emitter of described triode Q16, the base stage of described triode Q15 is connected with the collector electrode of triode Q16 by resistance R101, the emitter of described triode Q15 connects with+4.9V the voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit 7, the collector electrode of described triode Q15 connects with the anode of rectifier diode D33, the negative electrode of described rectifier diode D33 is connected with the positive pole of lithium battery BT1 by resistance R98, when battery voltage detection circuit 11 detects the voltage of rechargeable battery 6 lower than 3.6V, the 41st pin of gsm module GU900Q exports high level, triode Q16 conducting, thus triode Q15 also conducting, and the charge circuit of rechargeable battery 6 is set up, and enters charged state, when battery voltage detection circuit 11 detects that the voltage of rechargeable battery 6 reaches 4.2V, the 41st pin output low level of gsm module GU900Q, triode Q16 ends, thus triode Q15 also ends, and the charge circuit of rechargeable battery 6 cuts off, and stops charging.

As shown in Figure 3, in the present embodiment, described battery protecting circuit 10 comprises Li battery protection IC DW01, NMOS tube Q15 and NMOS tube Q16, 5th pin of described Li battery protection IC DW01 is connected with the positive pole of lithium battery BT1 by resistance R109, and connected with the negative pole of lithium battery BT1 by nonpolar electric capacity C88, 6th pin of described Li battery protection IC DW01 and the source electrode of NMOS tube Q15 all connect with the negative pole of lithium battery BT1, 1st pin of described Li battery protection IC DW01 connects with the grid of NMOS tube Q15, 3rd pin of described Li battery protection IC DW01 connects with the grid of NMOS tube Q16, the drain electrode of described NMOS tube Q15 connects with the drain electrode of NMOS tube Q16, the source ground of described NMOS tube Q16, 2nd pin of described Li battery protection IC DW01 is by resistance R96 ground connection, the voltage of rechargeable battery 6 is detected owing to depending merely on battery voltage detection circuit 11, and by battery charger 9 for rechargeable battery 6 charging is reliable not, therefore the utility model adds battery protecting circuit 10, additives for overcharge protection, over, overcurrent protection, short-circuit protection and high temperature protection are carried out to rechargeable battery 6, and when specifically installing, Li battery protection IC DW01 is close to rechargeable battery and installs.Concrete protection process is: during normal condition, the supply voltage of Li battery protection IC DW01 is the voltage of rechargeable battery 6, now, 1st pin and the 3rd pin of Li battery protection IC DW01 all export high level, NMOS tube Q15 and NMOS tube Q16 is all in conducting state, and the discharge and recharge of rechargeable battery 6 all can be carried out; During overcharge condition, Li battery protection IC DW01 detects that voltage that rechargeable battery 6 exports is higher than charging tolerance value, and now, the 3rd pin of Li battery protection IC DW01 becomes low level, is turned off by NMOS tube Q16, and rechargeable battery 6 stops charging; During over-discharge state, Li battery protection IC DW01 detects that voltage that rechargeable battery 6 exports is lower than discharge tolerance system, and now, the 1st pin of Li battery protection IC DW01 becomes low level, is turned off by NMOS tube Q15, and rechargeable battery 6 stops electric discharge, still chargeable; When rechargeable battery 6 discharges, because of load variations guiding discharge electric current excessive time, the voltage of the 2nd pin of Li battery protection IC DW01 can raise, 1st pin of Li battery protection IC DW01 becomes low level, turned off by NMOS tube Q15, rechargeable battery 6 stops electric discharge, achieves overcurrent protection; During short circuit, rechargeable battery 6 heavy-current discharge, when discharging current is excessive, the voltage of the 2nd pin of Li battery protection IC DW01 can raise, and the 1st pin of Li battery protection IC DW01 becomes low level, is turned off by NMOS tube Q15, rechargeable battery 6 stops electric discharge, achieves short-circuit protection; When rechargeable battery 6 high temperature, Li battery protection IC DW01 detects high temperature, is all turned off by NMOS tube Q15 and NMOS tube Q16, and rechargeable battery 6 stops charging and discharging.

As shown in Figure 6, in the present embodiment, the low indicating circuit of described battery electric quantity 40 comprises triode Q12 and is used to indicate the low light-emitting diode D20 of battery electric quantity, the base stage of described triode Q12 is connected with the 40th pin of gsm module GU900Q by resistance R71, and by nonpolar electric capacity C54 ground connection, the collector electrode of described triode Q12 is connected with the negative electrode of light-emitting diode D20 by resistance R64, the anode of described light-emitting diode D20 connects with+4.2V the voltage output end of power supply switch circuit 8, the grounded emitter of described triode Q12.This emergency communication main frame is provided with rechargeable battery 6 as there being back-up source, when rechargeable battery 6 voltage being detected lower than 3.6V, the 40th pin of gsm module GU900Q exports high level, makes triode Q12 conducting, light-emitting diode D20 lights, and represents electricity shortage signal.

In the present embodiment, described GSM antenna 20 connects with the 60th pin of gsm module GU900Q, as shown in Figure 7, described SIM card holder 44 is SIM card holder ID1A-6S-2.54SF, 1st pin of described SIM card holder ID1A-6S-2.54SF connects with the 30th pin of gsm module GU900Q, and by nonpolar electric capacity C65 ground connection, 2nd pin of described SIM card holder ID1A-6S-2.54SF is connected with the 33rd pin of gsm module GU900Q by resistance R80, 3rd pin of described SIM card holder ID1A-6S-2.54SF is connected with the 32nd pin of gsm module GU900Q by resistance R81, the 4th pin ground connection of described SIM card holder ID1A-6S-2.54SF, 6th pin of described SIM card holder ID1A-6S-2.54SF is connected with the 31st pin of gsm module GU900Q by resistance R82,

As shown in Figure 8, in the present embodiment, described watchdog circuit 21 comprises chip PIC12F508,1st pin of described chip PIC12F508 connects with the 15th pin of gsm module GU900Q, 3rd pin of described chip PIC12F508 is connected with the 16th pin of gsm module GU900Q by resistance R77,4th pin of described chip PIC12F508 is connected with the 2nd pin of gsm module GU900Q by resistance R76, the 8th pin ground connection of described chip PIC12F508; By arranging watchdog circuit 21, the generation of deadlock situation can be avoided, improve the reliability of work.The 2.8V linear voltage that 15th pin of described gsm module GU900Q exports is that described chip PIC12F508 powers.

As shown in Figure 8, in the present embodiment, described reset circuit 22 is made up of reset key K2, resistance R118 and nonpolar electric capacity C89, one end of one end of described reset key K2, one end of resistance R118 and nonpolar electric capacity C89 all connects with the 16th pin of gsm module GU900Q, the other end of described resistance R118 connects with the 15th pin of gsm module GU900Q, the other end of described reset key K2 and the equal ground connection of the other end of nonpolar electric capacity C89; The 2.8V linear voltage that 15th pin of described gsm module GU900Q exports is that described reset circuit 22 is powered.

As shown in Figure 9, in the present embodiment, described GSM network signal indicating circuit 23 comprises triode Q13 and is used to indicate the light-emitting diode D21 of GSM network signal, the base stage of described triode Q13 is connected with the 52nd pin of gsm module GU900Q by resistance R72, and by nonpolar electric capacity C55 ground connection, the collector electrode of described triode Q13 is connected with the negative electrode of light-emitting diode D21 by resistance R65, the anode of described light-emitting diode D21 connects with+4.2V the voltage output end of power supply switch circuit 8, the grounded emitter of described triode Q13;

As shown in Figure 10, in the present embodiment, described buzzer circuit 39 comprises buzzer LS2 and triode Q27, the base stage of described triode Q27 is connected with the 42nd pin of gsm module GU900Q by resistance R323, and by resistance R324 ground connection, the collector electrode of described triode Q27 connects with the negative pole of buzzer LS2, and the positive pole of described buzzer LS2 connects with+4.2V the voltage output end of power supply switch circuit 8, the grounded emitter of described triode Q27.

As shown in figure 11, in the present embodiment, described distress call testing circuit 19 comprises extension set Interface Terminal J1, comparator chip LM393, diode D5, 1st pin of described extension set Interface Terminal J1 is extension set signal wire interface CH, 2nd pin of described extension set Interface Terminal J1 is extension set earth connection interface GND, 3rd pin of described extension set Interface Terminal J1 be+12V power cathode interface-, 4th pin of described extension set Interface Terminal J1 be+12V positive source interface+, 4th pin of described extension set Interface Terminal J1 is connected to the rectifier diode D30 that negative electrode connects with it, the anode of described rectifier diode D30 connects with+12V the voltage output end of extension set voltage supply control circuit 16, 2nd pin of described comparator chip LM393 connects with the positive pole of diode D5, and connected with+5V the voltage output end of linear voltage-stabilizing circuit 15 by resistance R3 in parallel and nonpolar electric capacity C1, the negative electrode of described diode D5 is connected with the 1st pin of described extension set Interface Terminal J1 by the resistance R1 of series connection and inductance L 1, 3rd pin of described comparator chip LM393 is connected with+5V the voltage output end of linear voltage-stabilizing circuit 15 by resistance R4, and by resistance R11 ground connection, 8th pin of described comparator chip LM393 connects with+5V the voltage output end of linear voltage-stabilizing circuit 15, the 4th pin ground connection of described comparator chip LM393, 1st pin of described comparator chip LM393 connects with the 3rd pin of gsm module GU900Q, and connected with the 15th pin of gsm module GU900Q by resistance R5.1st pin of described comparator chip LM393 is the output of described distress call testing circuit 19, on the one hand, testing result is exported to the 3rd pin of gsm module GU900Q, on the other hand, the 2.8V linear voltage source that the 15th pin being connected to described gsm module GU900Q by pull-up resistor R5 provides.During concrete enforcement, and described emergency communication main frame supports the use the call button between signal output part and earth terminal being provided with in the emergency communication extension set forming emergency communication system and being connected to emergency communication extension set, when user presses call button, just equal the 1st pin ground connection of described extension set Interface Terminal J1, now, diode D5 is in conducting state, 2nd pin voltage of described comparator chip LM393 is about 0.7V, 3rd pin of described comparator chip LM393 is the 2.5V that resistance R4 and resistance R11 divide extrusion, so now the 1st pin of described comparator chip LM393 is drawn high by 2.8V linear voltage source and is in high level state, when the 3rd pin of gsm module GU900Q detects that described distress call testing circuit 19 exports as high level, be just judged as detecting distress call, thus perform corresponding call function.

As shown in Figure 5, in the present embodiment, described intercommunication button 38 is button K1, and one end of described button K1 connects with the 44th pin of gsm module GU900Q, and is connected with the 15th pin of gsm module GU900Q by resistance R69, the other end ground connection of described button K1; The i.e. 2.8V linear voltage source that provided by the 15th pin that pull-up resistor R69 is connected to described gsm module GU900Q, one end of described button K1, when intercommunication button 38 is pressed, 44th pin of gsm module GU900Q detects high level, thus performs corresponding intercommunication function.

As shown in figure 13, in the present embodiment, described handle on-hook test button circuit 42 comprises handle on-hook test button and polar capacitor C10, described handle on-hook test button is two single-pole double-throw switch (SPDT) SW1,1st pin of described couple of single-pole double-throw switch (SPDT) SW1, the 2nd pin and the 3rd pin are respectively the normal-closed end pin of an one single-pole double-throw switch (SPDT), Chang Kaiduan pin and common port pin, and the 4th pin of described couple of single-pole double-throw switch (SPDT) SW1, the 5th pin and the 6th pin are respectively the normal-closed end pin of its another single-pole double-throw switch (SPDT), Chang Kaiduan pin and common port pin; 1st pin of described couple of single-pole double-throw switch (SPDT) SW1 connects with+12V the voltage output end of extension set voltage supply control circuit 16,3rd pin of described couple of single-pole double-throw switch (SPDT) SW1 is connected with the positive pole of polar capacitor C10 by resistance R6, the minus earth of described polar capacitor C10,5th pin of described couple of single-pole double-throw switch (SPDT) SW1 is connected with the 15th pin of gsm module GU900Q by resistance R85, and connected with the 48th pin of gsm module GU900Q by resistance R117, the 6th pin ground connection of described couple of single-pole double-throw switch (SPDT) SW1; The i.e. 2.8V linear voltage source that provided by the 15th pin that resistance pull-up R85 is connected to described gsm module GU900Q of the 5th pin of described couple of single-pole double-throw switch (SPDT) SW1.When talkback handle 3 off-hook, handle on-hook test button 37 is not pressed, circuit ON, and when talkback handle 3 on-hook, handle on-hook test button 37 is pressed, and circuit disconnects.

As shown in figure 12, in the present embodiment, described talkback handle speaking circuit 4 comprises the talkback handle Interface Terminal J10 with four pins, transformer T5 and chip LM386, 1st pin of described talkback handle Interface Terminal J10 connects with the positive pole of the talkback handle internal loudspeaker of emergency communication main frame, 2nd pin of described talkback handle Interface Terminal J10 connects with the negative pole of the talkback handle internal loudspeaker of emergency communication main frame, 3rd pin of described talkback handle Interface Terminal J10 connects and ground connection with the negative pole of the talkback handle internal microphone of emergency communication main frame, 4th pin of described talkback handle Interface Terminal J10 connects with the positive pole of the talkback handle internal microphone of emergency communication main frame, 2nd pin of described chip LM386 is connected with the 4th pin of described talkback handle Interface Terminal J10 by nonpolar electric capacity C101, and by nonpolar electric capacity C100 ground connection, described nonpolar electric capacity C101 is connected with the positive pole of polar capacitor C10 by resistance R114 with the link of the 4th pin of described talkback handle Interface Terminal J10, and by nonpolar electric capacity C102 ground connection, 3rd pin of described chip LM386 and the equal ground connection of the 4th pin, 6th pin of described chip LM386 connects with the 3rd pin of described couple of single-pole double-throw switch (SPDT) SW1, and by polar capacitor C106 ground connection, 7th pin of described chip LM386 is by nonpolar electric capacity C80 ground connection, 1st pin of described chip LM386 be connected to the resistance R115 and nonpolar electric capacity C78 that connect between the 8th pin, 5th pin of described chip LM386 is connected with the centre tap of the primary coil of described transformer T5 by the polar capacitor C105 of series connection and resistance R74, the link of described polar capacitor C105 and resistance R74 is by nonpolar electric capacity C79 ground connection, one end of the primary coil of described transformer T5 connects with the 1st pin of described extension set Interface Terminal J1, and the other end of the primary coil of described transformer T5 passes through resistance R116 and the polar capacitor C92 ground connection of series connection, one end of the secondary coil of described transformer T5 is connected with the 2nd pin of talkback handle Interface Terminal J10 by resistance R13, and the other end of the secondary coil of described transformer T5 connects with the 1st pin of talkback handle Interface Terminal J10.The effect of talkback handle speaking circuit 4 is that the voice signal gathering talkback handle 3 internal microphone amplifies on the one hand, is on the other hand to pass to talkback handle 3 internal loudspeaker after being amplified by chip LM386 by the voice that gsm module 18 receives by emergency communication main frame to carry out sounding; The voltage at the 3rd pin place of two single-pole double-throw switch (SPDT) SW1 is supplied to talkback handle 3 internal microphone and sets up suitable quiescent operation bias voltage after the capacitance-resistance filter of resistance R6 and polar capacitor C10.When have people plucked talkback handle 3 talk time, talkback handle 3 internal microphone transfers the signal of telecommunication to sound wave and is coupled to chip LM386 by nonpolar electric capacity C101, exported by the 5th pin after chip LM386 amplifies audio signal, give the centre tap the 3rd pin of transformer T5 (in the Figure 14) of the primary coil of transformer T5, the 5th pin of transformer T5 (in the Figure 14) just has audio signal for one end of the primary coil of transformer T5, has just been transferred on extension set holding wire immediately; And the shunting equal and opposite in direction of centre tap the 3rd pin of transformer T5 (in the Figure 14) at two ends, left and right of the now primary coil of transformer T5, phase place is contrary, the induced current of the secondary coil of such transformer T5 (coil in Figure 14 between the 6th pin 1 of transformer T5 and the 10th pin) is 0, thus can not produce signal, so the sound of talkback handle 3 internal microphone input would not send in talkback handle 3 internal loudspeaker.Simultaneously, audio sound on extension set holding wire flows into from one end of the primary coil of transformer T5 the 5th pin of transformer T5 (the Figure 14), flow out from the other end of the primary coil of transformer T5 the 1st pin of transformer T5 (the Figure 14), capacitance-resistance balancing network through being made up of resistance R116 and polar capacitor C92 flow into ground, the secondary coil of such transformer T5 (coil in Figure 14 between the 6th pin 1 of transformer T5 and the 10th pin) just has electric current, simultaneously voltage will be induced at the secondary coil (coil in Figure 14 between the 6th pin 1 of transformer T5 and the 10th pin) of transformer T5, the voltage induced is the audio voltage signal on extension set holding wire, be linked into again inside talkback handle 3 internal loudspeaker.

As shown in figure 14, in the present embodiment, described anti-side-tone circuit 41 comprises transformer T2, one end of the secondary coil of described transformer T2 connects with the 1st pin of extension set Interface Terminal J1, and the nonpolar electric capacity C32 by connecting successively, resistance R47, resistance R56 and resistance R61 connects with one end of the primary coil of described transformer T2, one end of the primary coil of described transformer T2 is also connected with the one end of the resistance R59 after parallel connection and one end of nonpolar electric capacity C53 by resistance R60, the other end ground connection of the resistance R59 after parallel connection and nonpolar electric capacity C53, the other end of the secondary coil of described transformer T2 connects with+12V the voltage output end of extension set voltage supply control circuit 16, and by polar capacitor C34 ground connection, the centre tap ground connection of the primary coil of described transformer T2, the other end of the primary coil of described transformer T2 is the speech signal input YI_IN of anti-side-tone circuit 41, the link of described resistance R47 and resistance R56 is the voice signal output YI_OUT of anti-side-tone circuit 41.Described anti-side-tone circuit 41 builds transformer balance bridge network by transformer T2 to carry out elimination of the phase, thus eliminate sidetone, and the sidetone carrying out acoustic processing gained through this circuit is effective.

As shown in figure 15, in the present embodiment, described output voice isolation filter circuit 26 comprises transformer T1, and one end of the primary coil of described transformer T1 is connected with the 22nd pin of gsm module GU900Q by inductance L 7, and by nonpolar electric capacity C16 in parallel and nonpolar electric capacity C17 ground connection; The other end of the primary coil of described transformer T1 is connected with the 21st pin of gsm module GU900Q by inductance L 8, and by nonpolar electric capacity C29 in parallel and nonpolar electric capacity C31 ground connection; Nonpolar electric capacity C22 in parallel and nonpolar electric capacity C23 is connected between the two ends of the primary coil of described transformer T1, one end of the secondary coil of described transformer T1 is the output exporting voice isolation filter circuit 26, the other end ground connection of the secondary coil of described transformer T1; By arranging this output voice isolation filter circuit 26, effectively noise jamming can be prevented.

As shown in figure 15, in the present embodiment, described output audio resistance-capacitance coupling filter circuit 27 comprises resistance R37, nonpolar electric capacity C19 and nonpolar electric capacity C21, one end of described resistance R37 and one end of nonpolar electric capacity C21 all connect with the output exporting voice isolation filter circuit 26, one end of described nonpolar electric capacity C19 connects with the other end of resistance R37, the other end of described nonpolar electric capacity C19 is the output of output audio resistance-capacitance coupling filter circuit 27, and by resistance R38 ground connection;

As shown in figure 15, in the present embodiment, described output audio amplifying circuit 28 comprises chip TDA2003 and polar capacitor C20, 1st pin of described chip TDA2003 is connected with the output of output audio resistance-capacitance coupling filter circuit 27 by nonpolar electric capacity C18, 2nd pin of described chip TDA2003 passes through nonpolar electric capacity C33 and the resistance R43 ground connection of series connection, 5th pin of described chip TDA2003 connects with+12V the voltage output end of extension set voltage supply control circuit 16, and by nonpolar electric capacity C25 ground connection, 3rd pin of described chip TDA2003 and the equal ground connection of the 6th pin, 4th pin of described chip TDA2003 connects with the positive pole of polar capacitor C20, and connected with the link of nonpolar electric capacity C33 and resistance R43 by resistance R39, the negative pole of described polar capacitor C20 connects with the speech signal input YI_IN of anti-side-tone circuit 41, and pass through nonpolar electric capacity C24 and the resistance R41 ground connection of series connection.The loudspeaker being each emergency communication extension set of Direct driver due to output voice modulate circuit are spoken, therefore the voltage amplification factor of described output voice modulate circuit requirement is larger, adopt chip TDA2003 to carry out output audio amplification, user demand can be met well.

Described input voice modulate circuit refers to the voice modulate circuit of the transmitting voice signal of each emergency communication extension set to emergency communication host process, because in each emergency communication extension set, voice signal have passed through and once amplifies, so the multiplication factor of amplifying circuit requires lower after arriving emergency communication main frame.

As shown in figure 16, in the present embodiment, described input voice resistance-capacitance coupling filter circuit 29 comprises resistance R55, nonpolar electric capacity C39 and nonpolar electric capacity C43, one end of described nonpolar electric capacity C39 connects with the voice signal output YI_OUT of anti-side-tone circuit 41, and the other end of described nonpolar electric capacity C39 passes through the resistance R55 of series connection and nonpolar electric capacity C43 ground connection; Input voice are coupled into circuit by nonpolar electric capacity C39, then export after carrying out filtering by the RC filter circuit be made up of resistance R55 and nonpolar electric capacity C43;

As shown in figure 16, in the present embodiment, described input voice filtering and amplifying circuit 30 comprises the operational amplifier U5A in operational amplifier chip LM358,8th pin of described operational amplifier chip LM358 is connected with+5V the voltage output end of linear voltage-stabilizing circuit 15 by resistance R44, and by nonpolar electric capacity C37 ground connection, the 4th pin ground connection of described operational amplifier chip LM358, the in-phase input end of described operational amplifier U5A is connected with+5V the voltage output end of linear voltage-stabilizing circuit 15 by resistance R48, and by resistance R51 ground connection, the inverting input of described operational amplifier U5A is connected with the link of resistance R55 and nonpolar electric capacity C43 by resistance R52, and by nonpolar electric capacity C44 ground connection, resistance R62 is connected between the output of described operational amplifier U5A and inverting input, the inverting input of described operational amplifier U5A passes through nonpolar electric capacity C51 and the resistance R63 ground connection of series connection, the output of described operational amplifier U5A is connected with the link of nonpolar electric capacity C51 and resistance R63 by nonpolar electric capacity C52 with the link of resistance R62, the output of described operational amplifier U5A also connects with one end of the resistance R53 after parallel connection and nonpolar electric capacity C42, the other end of the resistance R53 after parallel connection and nonpolar electric capacity C42 is the output of input voice filtering and amplifying circuit 30, voice signal after described input voice resistance-capacitance coupling filter circuit 29 process is input to the operational amplifier U5A in operational amplifier chip LM358 by resistance R52, resistance R62 is feedback resistance, + 5V the voltage that resistance R48 and resistance R51 is used for linear voltage-stabilizing circuit 15 exports carries out 1/2nd dividing potential drops, thus sets up suitable homophase amplification bias voltage, during concrete enforcement, the resistance of power taking resistance R52 is 5.1K, the resistance of resistance R62 is 10K, therefore the voltage amplification factor of described input voice filtering and amplifying circuit 30 is 2 times, the multiplication factor of described input voice filtering and amplifying circuit 30 is less, the noise of coming in through sound signal band is also very little, and each electronic devices and components in described input voice filtering and amplifying circuit 30 also constitute an active low-pass filter on the basis of amplifying, and carries out noise filtering to the voice signal of input.

As shown in figure 16, in the present embodiment, described input voice output buffer circuit 31 comprises the operational amplifier U5B in operational amplifier chip LM358, the in-phase input end of described operational amplifier U5B is connected with the output of input voice filtering and amplifying circuit 30 by resistance R54, the output of described operational amplifier U5B is the output of input voice output buffer circuit 31, and connect with the inverting input of operational amplifier U5B, and connected with one end of the nonpolar electric capacity C45 after parallel connection and resistance R57 by nonpolar electric capacity C41; Nonpolar electric capacity C45 after parallel connection and the other end ground connection of resistance R57; Described operational amplifier U5B constitutes voltage follower, can realize the undistorted transmission of input speech signal, reduces the output impedance of signal;

As shown in figure 16, in the present embodiment, described input voice isolation filter circuit 32 comprises transformer T3, one end of primary coil of described transformer T3 connects with the output of input voice output buffer circuit 31, the other end ground connection of the primary coil of described transformer T3, one end of the secondary coil of described transformer T3 connects with the 19th pin of gsm module GU900Q, and by nonpolar electric capacity C40 in parallel and nonpolar electric capacity C38 ground connection; The other end of the secondary coil of described transformer T3 connects with the 20th pin of gsm module GU900Q; And by nonpolar electric capacity C48 in parallel and nonpolar electric capacity C49 ground connection, between the two ends of the secondary coil of described transformer T3, be connected to nonpolar electric capacity C46 in parallel and nonpolar electric capacity C47.During concrete enforcement, described transformer T3 is the audio frequency transformer of 1:1, input voice after input voice filtering and amplifying circuit 30 and input voice output buffer circuit 31 process are isolated through transformer T3, and then by nonpolar electric capacity C40, nonpolar electric capacity C38, nonpolar electric capacity C48, nonpolar electric capacity C49, nonpolar electric capacity C46 and nonpolar electric capacity C47 carries out filtering, filtering gsm module GU900Q harass noise after be input in the middle of gsm module GU900Q, audio noise can be eliminated further through capacitor filtering, thus make the sound arriving gsm module GU900Q very pure.

After adopting the utility model to form emergency communication main frame, can with emergency communication extension set of the prior art, external mobile telephone (mobile phone) matches composition emergency communication system, emergency communication extension set is wired intercom side, external mobile telephone (mobile phone) is wireless talkback side, emergency communication main frame completes the intercommunication function with emergency communication extension set by the extension set holding wire be connected with emergency communication extension set, have access to any one party in wire system and all the other access square tube by extension set holding wire and talk about that (voice signal only transmits in wired system, do not launched by GSM network and carry out outgoing call), just achieve inner intercommunication call function, when having access to any one party in wire system and being made a call to the wireless talkback side outside wired system by GSM network, just achieve outside intercommunication call.Wireless talkback side, not by the restriction of region, occasion, can be arranged in mine, tunnel, factory building, skyscraper is interior, hoistway, in confined space etc., as long as when there being good GSM quorum sensing inhibitor, all can carry out external call, having very large convenience.

The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection range of technical solutions of the utility model.

Claims (10)

1. one kind has the emergency communication host circuit of external call function, it is characterized in that: comprise power circuit, main frame inside and outside speaking circuit and talkback handle speaking circuit (4), described power circuit comprises rechargeable battery (6) and the isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7) for 220V alternating current being converted to+4.9V voltage, and for selecting 220V AC-powered or rechargeable battery (6) to power and exporting the power supply switch circuit (8) of+4.2V voltage, described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7) and rechargeable battery (6) all connect with power supply switch circuit (8), the output of described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7) is connected to the battery charger (9) connected with rechargeable battery (6), described battery is connected to for carrying out additives for overcharge protection to rechargeable battery (6), over, overcurrent protection, the battery protecting circuit (10) of short-circuit protection and high temperature protection, the output of described rechargeable battery (6) is connected to battery voltage detection circuit (11), the output of described power supply switch circuit (8) is connected to power indicating circuit (12) and the non-isolated Switching Power Supply booster circuit (13) for by+4.2V voltage transitions being+12V voltage, the output of described non-isolated Switching Power Supply booster circuit (13) divides two-way, one tunnel is connected to the linear voltage-stabilizing circuit (15) for by+12V voltage transitions being+5V voltage, another road is connected to the extension set voltage supply control circuit (16) exporting to emergency communication extension set for controlling+12V voltage,

The SIM card holder (44) that described main frame inside and outside speaking circuit comprises gsm module (18) and connects with described gsm module (18), GSM antenna (20), watchdog circuit (21), reset circuit (22) and speed signal processing circuit, the output of described battery voltage detection circuit (11) connects with the input of gsm module (18), the input of described gsm module (18) is also connected to distress call testing circuit (19) and handle on-hook test button circuit (42), described handle on-hook test button circuit (42) is connected with talkback handle speaking circuit (4), described battery charger (9) and extension set voltage supply control circuit (16) all connect with the output of gsm module (18), the output of described gsm module (18) is also connected to buzzer circuit (39), the low indicating circuit of battery electric quantity (40) and GSM network signal indicating circuit (23), described speed signal processing circuit comprises output voice modulate circuit, input voice modulate circuit and anti-side-tone circuit (41), described output voice modulate circuit comprises output voice isolation filter circuit (26) connected successively, output audio resistance-capacitance coupling filter circuit (27) and output audio amplifying circuit (28), described output voice isolation filter circuit (26) connects with the output of gsm module (18), the output of described output audio amplifying circuit (28) connects with anti-side-tone circuit (41), described input voice modulate circuit comprises input voice resistance-capacitance coupling filter circuit (29) connected successively, input voice filtering and amplifying circuit (30), input voice output buffer circuit (31) and input voice isolation filter circuit (32), the input of described input voice resistance-capacitance coupling filter circuit (29) connects with anti-side-tone circuit (41), the output of described input voice isolation filter circuit (32) connects with the input of gsm module (18).

2. according to the emergency communication host circuit with external call function according to claim 1, it is characterized in that: described gsm module (18) is gsm module GU900Q, 1st pin of described gsm module GU900Q is by resistance R75 ground connection, 7th pin of described gsm module GU900Q is connected with the 15th pin of gsm module GU900Q by resistance R66, 15th pin of described gsm module GU900Q is by nonpolar electric capacity C62 in parallel and nonpolar electric capacity C63 ground connection, 34th pin of described gsm module GU900Q is connected with the 15th pin of gsm module GU900Q by resistance R79, 35th pin of described gsm module GU900Q is by resistance R78 ground connection, 26th pin of described gsm module GU900Q is by nonpolar electric capacity C61 ground connection, 55th ~ 57 pins of described gsm module GU900Q all connect with+4.2V the voltage output end of power supply switch circuit (8), and by nonpolar electric capacity C58 in parallel, nonpolar electric capacity C59, polar capacitor C60 and resistance R58 ground connection.

3. according to the emergency communication host circuit with external call function according to claim 2, it is characterized in that: described isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7) comprises and has two pins and power supply terminal J9 for connecting 220V alternating current, chip VIPER22AS-E, light-coupled isolation chip JC817, three-terminal voltage-stabilizing chip CYT431A, rectifier DZ, there is the transformer T4 of a primary coil and two secondary coils, fast recovery diode D24, rectifier diode D29, polar capacitor C66 and Schottky diode D25, one end of the primary coil of described transformer T4 connects with the positive pole of the cathode voltage output of rectifier DZ and polar capacitor C66, and connected with the negative electrode of fast recovery diode D24 by resistance R84 in parallel and nonpolar electric capacity C67, an ac input end of described rectifier DZ connects with the 1st pin of power supply terminal J9, another ac input end of described rectifier DZ is connected with the 2nd pin of power supply terminal J9 by fuse F1, the cathode voltage output of described rectifier DZ and the equal ground connection of negative pole of polar capacitor C66, 5th pin of described chip VIPER22AS-E, 6th pin, 7th pin and the 8th pin all connect with the other end of the anode of fast recovery diode D24 and the primary coil of transformer T4, 1st pin of described chip VIPER22AS-E and the equal ground connection of the 2nd pin, 3rd pin of described chip VIPER22AS-E connects with the 3rd pin of chip JC817, and by nonpolar electric capacity C76 ground connection, 4th pin of described chip VIPER22AS-E is connected with the negative electrode of rectifier diode D29 by resistance R92, and connected with the 4th pin of chip JC817 by resistance R93, and by nonpolar electric capacity C77 ground connection, the anode of described rectifier diode D29 connects with one end of a secondary coil of described transformer T4, the other end ground connection of a secondary coil of described transformer T4, 1st pin of described chip JC817 is connected with the negative electrode of Schottky diode D25 by resistance R91, and connected with the 2nd pin of chip JC817 and the negative terminals of three-terminal voltage-stabilizing chip CYT431A by resistance R94, the positive terminal ground connection of described three-terminal voltage-stabilizing chip CYT431A, the Voltage Reference end of described three-terminal voltage-stabilizing chip CYT431A is connected with the negative electrode of Schottky diode D25 by resistance R95, and by resistance R97 ground connection, the anode of described Schottky diode D25 connects with one end of another secondary coil of transformer T4, and by series connection resistance R87 and nonpolar electric capacity C68 connect with the negative electrode of Schottky diode D25, the other end ground connection of another secondary coil of described transformer T4, the negative electrode of described Schottky diode D25 is the+4.9V voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7), and by polar capacitor C70 ground connection,

Described power supply switch circuit (8) comprises PMOS Q14, rectifier diode D26 and fast recovery diode D35, the grid of described PMOS Q14 and the anode of rectifier diode D26 all connect with+4.9V the voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7), the drain electrode of described PMOS Q14 and the anode of fast recovery diode D35 all connect with the positive pole of rechargeable battery (6), the source electrode of described PMOS Q14 and the negative electrode of fast recovery diode D35 all connect with the negative electrode of rectifier diode D26 and are+4.2V the voltage output end of power supply switch circuit (8),

Described power indicating circuit (12) comprises light-emitting diode D2 and resistance R9, the anode of described light-emitting diode D2 is connected with+4.2V the voltage output end of power supply switch circuit (8) by resistance R9, the minus earth of described light-emitting diode D2;

Described non-isolated Boost circuit (13) comprises switching power source chip MC34063A, Schottky diode D34 and polar capacitor C87,8th pin of described switching power source chip MC34063A is connected with+4.2V the voltage output end of power supply switch circuit (8) by the resistance R103 of series connection and resistance R104,6th pin of described switching power source chip MC34063A connects with+4.2V the voltage output end of power supply switch circuit (8), 7th pin of described switching power source chip MC34063A connects with the link of resistance R103 and resistance R104, and connected with the 1st pin of switching power source chip MC34063A and the anode of Schottky diode D34 by inductance L 10, the negative electrode of described Schottky diode D34 is the+12V voltage output end of non-isolated Boost circuit (13) and connects with the positive pole of polar capacitor C87, the minus earth of described polar capacitor C87,5th pin of described switching power source chip MC34063A is by resistance R108 ground connection, and connected with the negative electrode of Schottky diode D34 by resistance R107,3rd pin of described switching power source chip MC34063A is by nonpolar electric capacity C81 ground connection,

Described linear voltage-stabilizing circuit (15) comprises voltage stabilizing chip LM7805, and the 1st pin of described voltage stabilizing chip LM7805 connects with+12V the voltage output end of non-isolated Boost circuit (13), and by nonpolar electric capacity C83 ground connection; The 2nd pin ground connection of described voltage stabilizing chip LM7805, the 3rd pin of described voltage stabilizing chip LM7805 is the+5V voltage output end of linear voltage-stabilizing circuit (15), and by nonpolar electric capacity C86 ground connection;

Described extension set voltage supply control circuit (16) comprises triode Q1, triode Q17 and triode Q28, and for carrying out the light-emitting diode D1 of call signal instruction; The base stage of described triode Q1 is connected with the 7th pin of gsm module GU900Q by resistance R10, and by nonpolar electric capacity C3 ground connection, the grounded emitter of described triode Q1, the collector electrode of described triode Q1 is connected with the base stage of triode Q17 and the collector electrode of triode Q28 by resistance R68, and is connected with the negative electrode of light-emitting diode D1 by resistance R8; The emitter of described triode Q17 and the base stage of triode Q28 are all connected with+12V the voltage output end of non-isolated Switching Power Supply booster circuit (13) by resistance R325, described light-emitting diode D1 connects with+12V the voltage output end of non-isolated Switching Power Supply booster circuit (13) ,+12V voltage output end of the current collection of described triode Q17 very extension set voltage supply control circuit (16).

4. according to the emergency communication host circuit with external call function according to claim 2, it is characterized in that: described rechargeable battery (6) is lithium battery BT1, described battery voltage detection circuit (11) comprises resistance R99 and resistance R100, one end of described resistance R99 and one end of resistance R100 all connect with the 25th pin of gsm module GU900Q, the other end of described resistance R99 connects with the positive pole of lithium battery BT1, the other end ground connection of described resistance R100;

Described battery charger (9) comprises triode Q15, triode Q16 and rectifier diode D33, the base stage of described triode Q16 is connected with the 41st pin of gsm module GU900Q by resistance R102, the grounded emitter of described triode Q16, the base stage of described triode Q15 is connected with the collector electrode of triode Q16 by resistance R101, the emitter of described triode Q15 connects with+4.9V the voltage output end of isolated single-ended reverse exciting switching voltage regulator reduction voltage circuit (7), the collector electrode of described triode Q15 connects with the anode of rectifier diode D33, the negative electrode of described rectifier diode D33 is connected with the positive pole of lithium battery BT1 by resistance R98,

Described battery protecting circuit (10) comprises Li battery protection IC DW01, NMOS tube Q15 and NMOS tube Q16, 5th pin of described Li battery protection IC DW01 is connected with the positive pole of lithium battery BT1 by resistance R109, and connected with the negative pole of lithium battery BT1 by nonpolar electric capacity C88, 6th pin of described Li battery protection IC DW01 and the source electrode of NMOS tube Q15 all connect with the negative pole of lithium battery BT1, 1st pin of described Li battery protection IC DW01 connects with the grid of NMOS tube Q15, 3rd pin of described Li battery protection IC DW01 connects with the grid of NMOS tube Q16, the drain electrode of described NMOS tube Q15 connects with the drain electrode of NMOS tube Q16, the source ground of described NMOS tube Q16, 2nd pin of described Li battery protection IC DW01 is by resistance R96 ground connection,

The low indicating circuit of described battery electric quantity (40) comprises triode Q12 and is used to indicate the low light-emitting diode D20 of battery electric quantity, the base stage of described triode Q12 is connected with the 40th pin of gsm module GU900Q by resistance R71, and by nonpolar electric capacity C54 ground connection, the collector electrode of described triode Q12 is connected with the negative electrode of light-emitting diode D20 by resistance R64, the anode of described light-emitting diode D20 connects with+4.2V the voltage output end of power supply switch circuit (8), the grounded emitter of described triode Q12.

5. according to the emergency communication host circuit with external call function according to claim 2, it is characterized in that: described GSM antenna (20) connects with the 60th pin of gsm module GU900Q, described SIM card holder (44) is SIM card holder ID1A-6S-2.54SF, 1st pin of described SIM card holder ID1A-6S-2.54SF connects with the 30th pin of gsm module GU900Q, and by nonpolar electric capacity C65 ground connection, 2nd pin of described SIM card holder ID1A-6S-2.54SF is connected with the 33rd pin of gsm module GU900Q by resistance R80, 3rd pin of described SIM card holder ID1A-6S-2.54SF is connected with the 32nd pin of gsm module GU900Q by resistance R81, the 4th pin ground connection of described SIM card holder ID1A-6S-2.54SF, 6th pin of described SIM card holder ID1A-6S-2.54SF is connected with the 31st pin of gsm module GU900Q by resistance R82,

Described watchdog circuit (21) comprises chip PIC12F508,1st pin of described chip PIC12F508 connects with the 15th pin of gsm module GU900Q, 3rd pin of described chip PIC12F508 is connected with the 16th pin of gsm module GU900Q by resistance R77,4th pin of described chip PIC12F508 is connected with the 2nd pin of gsm module GU900Q by resistance R76, the 8th pin ground connection of described chip PIC12F508;

Described reset circuit (22) is made up of reset key K2, resistance R118 and nonpolar electric capacity C89, one end of one end of described reset key K2, one end of resistance R118 and nonpolar electric capacity C89 all connects with the 16th pin of gsm module GU900Q, the other end of described resistance R118 connects with the 15th pin of gsm module GU900Q, the other end of described reset key K2 and the equal ground connection of the other end of nonpolar electric capacity C89;

Described GSM network signal indicating circuit (23) comprises triode Q13 and is used to indicate the light-emitting diode D21 of GSM network signal, the base stage of described triode Q13 is connected with the 52nd pin of gsm module GU900Q by resistance R72, and by nonpolar electric capacity C55 ground connection, the collector electrode of described triode Q13 is connected with the negative electrode of light-emitting diode D21 by resistance R65, the anode of described light-emitting diode D21 connects with+4.2V the voltage output end of power supply switch circuit (8), the grounded emitter of described triode Q13;

Described buzzer circuit (39) comprises buzzer LS2 and triode Q27, the base stage of described triode Q27 is connected with the 42nd pin of gsm module GU900Q by resistance R323, and by resistance R324 ground connection, the collector electrode of described triode Q27 connects with the negative pole of buzzer LS2, the positive pole of described buzzer LS2 connects with+4.2V the voltage output end of power supply switch circuit (8), the grounded emitter of described triode Q27.

6. according to the emergency communication host circuit with external call function according to claim 2, it is characterized in that: described distress call testing circuit (19) comprises extension set Interface Terminal J1, comparator chip LM393, diode D5, 1st pin of described extension set Interface Terminal J1 is extension set signal wire interface CH, 2nd pin of described extension set Interface Terminal J1 is extension set earth connection interface GND, 3rd pin of described extension set Interface Terminal J1 be+12V power cathode interface-, 4th pin of described extension set Interface Terminal J1 be+12V positive source interface+, 4th pin of described extension set Interface Terminal J1 is connected to the rectifier diode D30 that negative electrode connects with it, the anode of described rectifier diode D30 connects with+12V the voltage output end of extension set voltage supply control circuit (16), 2nd pin of described comparator chip LM393 connects with the positive pole of diode D5, and connected with+5V the voltage output end of linear voltage-stabilizing circuit (15) by resistance R3 in parallel and nonpolar electric capacity C1, the negative electrode of described diode D5 is connected with the 1st pin of described extension set Interface Terminal J1 by the resistance R1 of series connection and inductance L 1, 3rd pin of described comparator chip LM393 is connected with+5V the voltage output end of linear voltage-stabilizing circuit (15) by resistance R4, and by resistance R11 ground connection, 8th pin of described comparator chip LM393 connects with+5V the voltage output end of linear voltage-stabilizing circuit (15), the 4th pin ground connection of described comparator chip LM393, 1st pin of described comparator chip LM393 connects with the 3rd pin of gsm module GU900Q, and connected with the 15th pin of gsm module GU900Q by resistance R5.

7. according to the emergency communication host circuit with external call function according to claim 6, it is characterized in that: described intercommunication button (38) is button K1, one end of described button K1 connects with the 44th pin of gsm module GU900Q, and connected with the 15th pin of gsm module GU900Q by resistance R69, the other end ground connection of described button K1;

Described handle on-hook test button circuit (42) comprises handle on-hook test button and polar capacitor C10, described handle on-hook test button is two single-pole double-throw switch (SPDT) SW1,1st pin of described couple of single-pole double-throw switch (SPDT) SW1, the 2nd pin and the 3rd pin are respectively the normal-closed end pin of an one single-pole double-throw switch (SPDT), Chang Kaiduan pin and common port pin, and the 4th pin of described couple of single-pole double-throw switch (SPDT) SW1, the 5th pin and the 6th pin are respectively the normal-closed end pin of its another single-pole double-throw switch (SPDT), Chang Kaiduan pin and common port pin; 1st pin of described couple of single-pole double-throw switch (SPDT) SW1 connects with+12V the voltage output end of extension set voltage supply control circuit (16), 3rd pin of described couple of single-pole double-throw switch (SPDT) SW1 is connected with the positive pole of polar capacitor C10 by resistance R6, the minus earth of described polar capacitor C10,5th pin of described couple of single-pole double-throw switch (SPDT) SW1 is connected with the 15th pin of gsm module GU900Q by resistance R85, and connected with the 48th pin of gsm module GU900Q by resistance R117, the 6th pin ground connection of described couple of single-pole double-throw switch (SPDT) SW1;

Described talkback handle speaking circuit (4) comprises the talkback handle Interface Terminal J10 with four pins, transformer T5 and chip LM386, 1st pin of described talkback handle Interface Terminal J10 connects with the positive pole of the talkback handle internal loudspeaker of emergency communication main frame, 2nd pin of described talkback handle Interface Terminal J10 connects with the negative pole of the talkback handle internal loudspeaker of emergency communication main frame, 3rd pin of described talkback handle Interface Terminal J10 connects and ground connection with the negative pole of the talkback handle internal microphone of emergency communication main frame, 4th pin of described talkback handle Interface Terminal J10 connects with the positive pole of the talkback handle internal microphone of emergency communication main frame, 2nd pin of described chip LM386 is connected with the 4th pin of described talkback handle Interface Terminal J10 by nonpolar electric capacity C101, and by nonpolar electric capacity C100 ground connection, described nonpolar electric capacity C101 is connected with the positive pole of polar capacitor C10 by resistance R114 with the link of the 4th pin of described talkback handle Interface Terminal J10, and by nonpolar electric capacity C102 ground connection, 3rd pin of described chip LM386 and the equal ground connection of the 4th pin, 6th pin of described chip LM386 connects with the 3rd pin of described couple of single-pole double-throw switch (SPDT) SW1, and by polar capacitor C106 ground connection, 7th pin of described chip LM386 is by nonpolar electric capacity C80 ground connection, 1st pin of described chip LM386 be connected to the resistance R115 and nonpolar electric capacity C78 that connect between the 8th pin, 5th pin of described chip LM386 is connected with the centre tap of the primary coil of described transformer T5 by the polar capacitor C105 of series connection and resistance R74, the link of described polar capacitor C105 and resistance R74 is by nonpolar electric capacity C79 ground connection, one end of the primary coil of described transformer T5 connects with the 1st pin of described extension set Interface Terminal J1, and the other end of the primary coil of described transformer T5 passes through resistance R116 and the polar capacitor C92 ground connection of series connection, one end of the secondary coil of described transformer T5 is connected with the 2nd pin of talkback handle Interface Terminal J10 by resistance R13, and the other end of the secondary coil of described transformer T5 connects with the 1st pin of talkback handle Interface Terminal J10.

8. according to the emergency communication host circuit with external call function according to claim 6, it is characterized in that: described anti-side-tone circuit (41) comprises transformer T2, one end of the secondary coil of described transformer T2 connects with the 1st pin of extension set Interface Terminal J1, and the nonpolar electric capacity C32 by connecting successively, resistance R47, resistance R56 and resistance R61 connects with one end of the primary coil of described transformer T2, one end of the primary coil of described transformer T2 is also connected with the one end of the resistance R59 after parallel connection and one end of nonpolar electric capacity C53 by resistance R60, the other end ground connection of the resistance R59 after parallel connection and nonpolar electric capacity C53, the other end of the secondary coil of described transformer T2 connects with+12V the voltage output end of extension set voltage supply control circuit (16), and by polar capacitor C34 ground connection, the centre tap ground connection of the primary coil of described transformer T2, the other end of the primary coil of described transformer T2 is the speech signal input YI_IN of anti-side-tone circuit (41), the link of described resistance R47 and resistance R56 is the voice signal output YI_OUT of anti-side-tone circuit (41).

9. according to the emergency communication host circuit with external call function according to claim 8, it is characterized in that: described output voice isolation filter circuit (26) comprises transformer T1, one end of the primary coil of described transformer T1 is connected with the 22nd pin of gsm module GU900Q by inductance L 7, and by nonpolar electric capacity C16 in parallel and nonpolar electric capacity C17 ground connection; The other end of the primary coil of described transformer T1 is connected with the 21st pin of gsm module GU900Q by inductance L 8, and by nonpolar electric capacity C29 in parallel and nonpolar electric capacity C31 ground connection; Nonpolar electric capacity C22 in parallel and nonpolar electric capacity C23 is connected between the two ends of the primary coil of described transformer T1, one end of the secondary coil of described transformer T1 is the output exporting voice isolation filter circuit (26), the other end ground connection of the secondary coil of described transformer T1;

Described output audio resistance-capacitance coupling filter circuit (27) comprises resistance R37, nonpolar electric capacity C19 and nonpolar electric capacity C21, one end of described resistance R37 and one end of nonpolar electric capacity C21 all connect with the output exporting voice isolation filter circuit (26), one end of described nonpolar electric capacity C19 connects with the other end of resistance R37, the other end of described nonpolar electric capacity C19 is the output of output audio resistance-capacitance coupling filter circuit (27), and by resistance R38 ground connection;

Described output audio amplifying circuit (28) comprises chip TDA2003 and polar capacitor C20, 1st pin of described chip TDA2003 is connected with the output of output audio resistance-capacitance coupling filter circuit (27) by nonpolar electric capacity C18, 2nd pin of described chip TDA2003 passes through nonpolar electric capacity C33 and the resistance R43 ground connection of series connection, 5th pin of described chip TDA2003 connects with+12V the voltage output end of extension set voltage supply control circuit (16), and by nonpolar electric capacity C25 ground connection, 3rd pin of described chip TDA2003 and the equal ground connection of the 6th pin, 4th pin of described chip TDA2003 connects with the positive pole of polar capacitor C20, and connected with the link of nonpolar electric capacity C33 and resistance R43 by resistance R39, the negative pole of described polar capacitor C20 connects with the speech signal input YI_IN of anti-side-tone circuit (41), and pass through nonpolar electric capacity C24 and the resistance R41 ground connection of series connection.

10. according to the emergency communication host circuit with external call function according to claim 8, it is characterized in that: described input voice resistance-capacitance coupling filter circuit (29) comprises resistance R55, nonpolar electric capacity C39 and nonpolar electric capacity C43, one end of described nonpolar electric capacity C39 connects with the voice signal output YI_OUT of anti-side-tone circuit (41), and the other end of described nonpolar electric capacity C39 passes through the resistance R55 of series connection and nonpolar electric capacity C43 ground connection;

Described input voice filtering and amplifying circuit (30) comprises the operational amplifier U5A in operational amplifier chip LM358,8th pin of described operational amplifier chip LM358 is connected with+5V the voltage output end of linear voltage-stabilizing circuit (15) by resistance R44, and by nonpolar electric capacity C37 ground connection, the 4th pin ground connection of described operational amplifier chip LM358, the in-phase input end of described operational amplifier U5A is connected with+5V the voltage output end of linear voltage-stabilizing circuit (15) by resistance R48, and by resistance R51 ground connection, the inverting input of described operational amplifier U5A is connected with the link of resistance R55 and nonpolar electric capacity C43 by resistance R52, and by nonpolar electric capacity C44 ground connection, resistance R62 is connected between the output of described operational amplifier U5A and inverting input, the inverting input of described operational amplifier U5A passes through nonpolar electric capacity C51 and the resistance R63 ground connection of series connection, the output of described operational amplifier U5A is connected with the link of nonpolar electric capacity C51 and resistance R63 by nonpolar electric capacity C52 with the link of resistance R62, the output of described operational amplifier U5A also connects with one end of the resistance R53 after parallel connection and nonpolar electric capacity C42, the other end of the resistance R53 after parallel connection and nonpolar electric capacity C42 is the output of input voice filtering and amplifying circuit (30),

Described input voice output buffer circuit (31) comprises the operational amplifier U5B in operational amplifier chip LM358, the in-phase input end of described operational amplifier U5B is connected with the output of input voice filtering and amplifying circuit (30) by resistance R54, the output of described operational amplifier U5B is the output of input voice output buffer circuit (31), and connect with the inverting input of operational amplifier U5B, and connected with one end of the nonpolar electric capacity C45 after parallel connection and resistance R57 by nonpolar electric capacity C41; Nonpolar electric capacity C45 after parallel connection and the other end ground connection of resistance R57;

Described input voice isolation filter circuit (32) comprise transformer T3, described transformer T3 primary coil one end with input voice output buffer circuit (31) output connect, the other end ground connection of the primary coil of described transformer T3, one end of the secondary coil of described transformer T3 connects with the 19th pin of gsm module GU900Q, and by nonpolar electric capacity C40 in parallel and nonpolar electric capacity C38 ground connection; The other end of the secondary coil of described transformer T3 connects with the 20th pin of gsm module GU900Q; And by nonpolar electric capacity C48 in parallel and nonpolar electric capacity C49 ground connection, between the two ends of the secondary coil of described transformer T3, be connected to nonpolar electric capacity C46 in parallel and nonpolar electric capacity C47.