CN2648711Y

CN2648711Y - User interface circuit with high integrated level

Info

Publication number: CN2648711Y
Application number: CNU2003201176910U
Authority: CN
Inventors: 王景波
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-11-04
Filing date: 2003-11-04
Publication date: 2004-10-13
Anticipated expiration: 2013-11-04

Abstract

A highly integrated user interface circuit is suitable for a small capacity user communication terminal speech interface, comprising: 1, a ringing switch and an anode and reversal switch circuit, 2, a ringing drive and an anode and reversal driving logic circuit, 3, a constant current feeding circuit and 4, an audio two/four-wire transform circuit. The circuits 1 to 4 are all integrated in a thick-film circuit and have extremely high reliability. By adopting the circuit device of the utility model, the cost of the user interface proposal is reduced by more than 30 percent compared with the prior art. Meanwhile, as the types of the external power are reduced and the ringing relay and the reversal relay are cancelled, the integration and reliability of the system are greatly enhanced.

Description

The high integration user interface circuit

Technical field

The utility model relates to telephone communicating technology field, especially is the thick film interface circuit of low capacity user communication terminal speech interface.

Background technology

The user interface part of subscriber exchange adopts unified supply power mode in the existing communication system, i.e. shared all kinds of power supplys of several user interface circuit, as+5V power supply ,-5V power supply ,-48V power supply and 25HZ ringing current generator.In the bigger communication system of capacity, all kinds of power supply costs can not cause increasing substantially of the power-supply system wasting of resources and cost because subscribers feeder quantity is more, but, the low capacity custom system had had swift and violent development in recent years, it as adopting the power source design of above-mentioned complexity, then can cause increasing substantially of system cost and being multiplied of volume in user interface part.Offshore company once produced the user interface circuit that has ringing current generator with semiconductor technology, but it needs to be equipped to this higher booster circuit in the periphery, simultaneously, because semiconductor technology itself is high pressure resistant poor, so spoilage is also higher.

Summary of the invention

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and the user interface thick film circuit device of a kind of low cost of proposing, small size, high reliability.

The utility model can be by realizing by the following technical solutions: a kind of high integration subscriber line circuit, contain ring switch and positive antipole switching circuit (I), ring drives and positive antipole drive logic (II), constant current feed circuit (III), audio frequency two/wire/four-wire converting circuit (IV), and described circuit all is integrated in the thick film circuit.Described ring switch and positive antipole switching circuit (I) are by triode Q9, Q11, Q1, Q6, Q8, Q10 and resistance R 2, R1, R5, R11, R13, R12 forms, triode Q9 wherein, Q11, Q1, Q6 constitutes full-bridge switch and emitter connects constant current feed circuit, triode Q9, Q11 is a PNP transistor, triode Q1, Q6 is a NPN transistor, triode Q9, the collector electrode of Q1 links to each other, triode Q11, the collector electrode of Q6 links to each other, triode Q8 is the driving tube of triode Q1, triode Q10 is the driving tube of triode Q6, triode Q8, the grounded emitter of Q10, triode Q8 base stage connects resistance R 2, triode Q11 base stage connects resistance R 11, the other end of resistance R 2 and resistance R 11 links together and is connected to that ring drives and the drive level DRV1 point of positive antipole drive logic (II), triode Q10 base stage connects resistance R 12, transistor base connects resistance R 1, and the other end of resistance R 12 and resistance R 1 links together and is connected to that ring drives and the drive level DRV2 point of positive antipole drive logic (II).Described ring driving and positive antipole drive logic (II) are by NOT gate logic circuit U1A, U1B, U1C, U1D, triode Q14, Q12, Q13 and resistance R 21, R17, R16, R19, R18 forms, 25 hertz of benchmark drive signals are input to the end of logical circuit U1A by 25HZ IN end, the ring drive signal is by the input of RC end, be input to the other end of logical circuit U1A through resistance R 10, be connected to two inputs of logical circuit U1D simultaneously, the output of logical circuit U1D is input to the input of logical circuit U1C, with antipole control signal CRL with after be connected to the input logical circuit of logical circuit U1B, the output of U1A is connected to another input of logical circuit U1B; The output process resistance R 21 of logical circuit U1B is connected to the base stage of triode Q14, through forming two drive ends of DRV1, DRV2 behind the inverter of being made up of triode Q12, Q13.Described constant current feed circuit (III) contains resistance R 22, R3, R4, triode Q2, the constant current feed circuit that Q3 forms, resistance R 6, R7, R8, R14, R15, triode Q4, the picking/hanging machine detection circuit that Q7 forms, resistance R 9, section bell circuit automatically that triode Q5 forms, wherein resistance R 22 1 ends connect feed ground A end, the other end connects triode Q9, the emitter terminal C point of Q11, triode Q2, Q3, resistance R 3, R4 forms constant-current source circuit, the collector electrode of triode Q2 is connected to triode Q1, the emitter terminal D point of Q6, the emitter terminal of triode Q2 is through resistance R 3, R14 is connected to negative voltage feed end B point, resistance R 6, R7, R8, R14, R15, triode Q4, the picking/hanging machine detection circuit that Q7 forms is by the output of HK end; HK end output signal links to each other with the base terminal of triode Q5 through resistance R 9, and the emitter terminal ground connection of triode Q5 and collector terminal are connected to the tie point of logical circuit U1A input and resistance R 10.When the feed electric power polarity is positive voltage, only need the symmetry transformation that ring switching circuit and positive antipole switching circuit and drive circuit are done is over the ground got final product.

The utility model integrated ringing current generator, ring on monolithic drive, positive antipole driving, constant-current feeding, two wire/four-wire converting circuits, real integrated necessary all functions of user interface circuit on monolithic, system only need provide-the 48V power supply ,+the 5V power supply, can meet the demands the integrated level that this will reduce system cost significantly and increase substantially system.Simultaneously, owing to adopt thick film integrated circuit technology, utilize thick film integrated circuit good high pressure resistant, characteristics that thermal resistance is low, overcome the shortcoming of semiconductor technology, make this circuit have high reliability.

Description of drawings

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

Fig. 2 is the described ring switch of utility model and positive antipole switching circuit (I), ring drives and positive antipole drive logic (II), constant current feed circuit (III) electrical schematic diagram

Execution mode

Be described in further details below in conjunction with the most preferred embodiment shown in the accompanying drawing

This circuit is formed (as shown in Figure 1) by four major parts: first is ring switch and positive and negative switching circuit (I), second portion is that ring drives and positive antipole drive circuit (II), third part is constant current feed circuit (III), and the 4th part is audio frequency two/wire/four-wire converting circuit (IV).

1. the realization of ringer function:

A, system provide 25HZ benchmark TTL square wave for this circuit, this signal is imported from 25HZ IN pin, when this machine of system calling, system is at 1 second high 4 seconds low Transistor-Transistor Logic levels of RC pin input, because the shielding action of NAND gate makes the 25HZ reference signal only just can output to 3 pin of logical circuit U1A when RC is high level; When 1 second high level, no matter positive antipole drive signal (CFL) is high level or low level, all masked by the low level of 8 pin of logical circuit U1C output, this moment, 11 pin of logical circuit U1D were exported high level, the 25HZ reference signal is transferred to 6 pin of logical circuit U1B, inverter through triode Q12, Q13, Q14 form obtains drive level DRV1, DRV2; DRV1 and DRV2 drive the full-bridge switch of first's ring switch and positive and negative switching circuit (I) simultaneously, and general-48V dc inversion becomes the 25HZ alternating current, obtain the ringing signal that effective value is about 48V between TIP end and RING end, make ringing telephone stations.

B, when 4 seconds low levels, RC is a low level, the conductively-closed of 25HZ reference signal is fallen, 3 pin of U1A are high level, simultaneously because 8 pin of logical circuit U1C are output as height, the CFL signal is through the anti-phase DRV1 that outputs to, because the CFL signal is or be height, it perhaps is low fixed level, so obtain anti-phase each other fixed level at DRV1 and DRV2 two ends, DRV1 and DRV2 drive full-bridge switch simultaneously, make the symmetric arms saturation conduction of bridge circuit, and output polarity is subjected to the 48V direct voltage of CFL level control between TIP and RING end; Feed voltage is by the symmetric arms of resistance R 22, full-bridge switch bridge circuit, and constant current feed circuit that resistance R 3, R4, triode Q2, Q3 form and resistance R 14 arrive-48V, form the 48V direct voltage at the telephone set two ends.

C, the cycle can make telephone set send the tinkle of bells repeatedly as mentioned above, thereby makes telephone set be in periodic ringing condition.

D, cut the realization of bell function: under 1 second ringing condition, RC is high, this moment is as user's off-hook, then the telephone set DC load is connected, feed current is by resistance R 22, the telephone set DC load, the symmetric arms of full-bridge switch bridge circuit, resistance R 3, R4, triode Q2, constant current feed circuit that Q3 forms and resistance R 14 arrive-48V, form loop current, the loop current value is 23mA, detected voltage is enough to make resistance R 6 on the resistance R 14 at this moment, R7, R8, R14, R15, triode Q4, the picking/hanging machine detection circuit action that Q7 forms, off-hook detection end HKD will export high level, HKD end output signal is input to the base terminal of triode Q5 through resistance R 9, make the c of triode Q5, the e end is low-resistance, even this moment, RC be high, but 1 pin of logical circuit U1A by clamped be low level, thereby a realization section bell function.

2. feed condition and positive antipole drive:

A, feed condition:

When the RC signal level when low, the conductively-closed of 25HZ reference signal.During on-hook, owing to the telephone set DC load does not have to connect, therefore do not have loop current to form, the last detected undertension of R14 is so that the picking/hanging machine detection circuit of R6, R7, R8, R14, R15, Q4, Q7 composition moves, and off-hook detection end HKD will export low; During off-hook, the conducting of telephone set DC load, loop current forms, and its current settings is 23mA, and this moment, the direct voltage at telephone set two ends was 6 ~ 7V, and telephone set enters dialing status or talking state.The picking/hanging machine detection circuit that the last detected voltage of R14 is enough to R6, R7, R8, R14, R15, Q4, Q7 are formed moves, and off-hook detection end HKD will export high level.

B, positive antipole drive:

When both call sides has the first on-hook of a side, the on-hook indication is received by system, system will carry out a state counter-rotating to the CFL end signal, the state of DRV1 and DRV2 is and then counter-rotating also, drive the opposite end brachium pontis conducting of full-bridge switch bridge circuit, make the polarity of voltage counter-rotating of TIP and RING end, thereby realize the antipole function, to drive the billing function unit.

3. audio frequency two/wire/four-wire converting circuit (IV) circuit is known by this professional person, is not described in detail in this.Need to prove: because triode Q1, Q11 (or triode Q6, Q9) conducting simultaneously makes itself to be in to exchange under the low resistive state, and the voice signal on the two wires by full-bridge switch, is realized voice transfer with loss-free.

Claims

1. high integration subscriber line circuit, it is characterized in that: contain ring switch and positive antipole switching circuit (I), ring drives and positive antipole drive logic (II), constant current feed circuit (III), audio frequency two/wire/four-wire converting circuit (IV), and described circuit all is integrated in the thick film circuit.

2. a kind of high integration subscriber line circuit according to claim 1, it is characterized in that: described ring switch and positive antipole switching circuit (I) are by triode Q9, Q11, Q1, Q6, Q8, Q10 and resistance R 2, R1, R5, R11, R13, R12 forms, triode Q9 wherein, Q11, Q1, Q6 constitutes full-bridge switch and emitter connects constant current feed circuit, triode Q9, Q11 is a PNP transistor, triode Q1, Q6 is a NPN transistor, triode Q9, the collector electrode of Q1 links to each other, triode Q11, the collector electrode of Q6 links to each other, triode Q8 is the driving tube of triode Q1, triode Q10 is the driving tube of triode Q6, triode Q8, the grounded emitter of Q10, triode Q8 base stage connects resistance R 2, triode Q11 base stage connects resistance R 11, the other end of resistance R 2 and resistance R 11 links together and is connected to that ring drives and the drive level DRV1 point of positive antipole drive logic (II), triode Q10 base stage connects resistance R 12, transistor base connects resistance R 1, and the other end of resistance R 12 and resistance R 1 links together and is connected to that ring drives and the drive level DRV2 point of positive antipole drive logic (II).

3. a kind of high integration subscriber line circuit according to claim 1, it is characterized in that: described ring driving and positive antipole drive logic (II) are by NOT gate logic circuit U1A, U1B, U1C, U1D, triode Q14, Q12, Q13 and resistance R 21, R17, R16, R19, R18 forms, 25 hertz of benchmark drive signals are input to the end of logical circuit U1A by 25HZ IN end, the ring drive signal is by the input of RC end, be input to the other end of logical circuit U1A through resistance R 10, be connected to two inputs of logical circuit U1D simultaneously, the output of logical circuit U1D is input to the input of logical circuit U1C, with antipole control signal CRL with after be connected to the input logical circuit of logical circuit U1B, the output of U1A is connected to another input of logical circuit U1B; The output process resistance R 21 of logical circuit U1B is connected to the base stage of triode Q14, through forming two drive ends of DRV1, DRV2 behind the inverter of being made up of triode Q12, Q13.

4. a kind of high integration subscriber line circuit according to claim 1, it is characterized in that: described constant current feed circuit (III) contains resistance R 22, R3, R4, triode Q2, the constant current feed circuit that Q3 forms, resistance R 6, R7, R8, R14, R15, triode Q4, the picking/hanging machine detection circuit that Q7 forms, resistance R 9, section bell circuit automatically that triode Q5 forms, wherein resistance R 22 1 ends connect feed ground A end, the other end connects triode Q9, the emitter terminal C point of Q11, triode Q2, Q3, resistance R 3, R4 forms constant-current source circuit, the collector electrode of triode Q2 is connected to triode Q1, the emitter terminal D point of Q6, the emitter terminal of triode Q2 is through resistance R 3, R14 is connected to negative voltage feed end B point, resistance R 6, R7, R8, R14, R15, triode Q4, the picking/hanging machine detection circuit that Q7 forms is by the output of HK end; HKD end output signal links to each other with the base terminal of triode Q5 through resistance R 9, and the emitter terminal ground connection of triode Q5 and collector terminal are connected to the tie point of logical circuit U1A input and resistance R 10.

5. a kind of high integration subscriber line circuit according to claim 1 is characterized in that: when the feed electric power polarity is positive voltage, only need the symmetry transformation that ring switching circuit and positive antipole switching circuit and drive circuit are done is over the ground got final product.