CN2565222Y - User interface circuit device - Google Patents

Abstract

The utility model relates to a customer interface circuit device, which is suitable for a customer system exchanger with small capacity. The utility model comprises: (1) an audio frequency 2/4 wire converting circuit, (2) a ringing drive and positive and negative pole drive circuit, (3) a ringing switch and positive and negative switching circuit, (4) a bidirectional constant current feeding circuit, wherein the circuit (2) and the circuit (3) are connected through two-wire electricity; the (2) and the (4), and the (3) and the (4) are respectively connected through a single wire electricity. Moreover, the circuits from the (1) to the (4) are made on a minitype printed circuit board, and all integrated into a thick film circuit. When a circuit device of the utility model is adopted, the cost of the customer interface part is reduced above 30 percent. Simultaneously, species of external matching power supply are reduced, a ringing relay and a negative pole relay are cancelled, and the integration degree and reliability of a system can be raised.

Description

The user interface circuit device

Technical field the utility model relates to telephone communicating technology field, relates in particular to subscriber exchange equipment, particularly relates to the exchanger user interface thick film circuit that is used for the low capacity custom system.

The user interface part of subscriber exchange adopts unified supply power mode in the background technology prior art communication system, i.e. shared all kinds of power supplys of several user interface circuit, and as+5 volts of power supplys ,-5 volts of power supplys ,-48 volts of power supplys and 25 He Zhi ringing current generators.In the bigger communication system of capacity, all kinds of power supply costs can not cause the significantly raising of the power-supply system wasting of resources and cost because subscribers feeder quantity is more, but, the low capacity custom system had had fast 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.Once there was reported in literature to produce the user interface circuit that has ringing current generator with semiconductor integrated circuit technique, but must be equipped to this higher booster circuit in the periphery, simultaneously, because the high voltage performance of semiconductor integrated circuit own is not good enough, so spoilage is also than higher.

Summary of the invention the objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and proposes a kind of low cost, small size, has the user interface thick film circuit device of high reliability simultaneously.The purpose of this utility model can be by realizing by the following technical solutions: design and produce a kind of user interface circuit device, be applicable to low capacity custom system switch, comprise 1. audio frequency two/wire/four-wire converting circuit, and comprise

2. ring drives and positive antipole drive circuit;

3. ring switch and positive and negative switching circuit;

4. bidirectional constant feed circuit; Wherein circuit 2. and have two-wire to be electrically connected 3., 2. and 4., and 3. and have single line to be electrically connected 4. respectively.And 4. described circuit 1. to being to be produced on the miniature printed circuit board, and all be integrated in the thick film circuit.

The utility model integrated ringing current generator, ring on monolithic drive, positive antipole driving, constant-current feeding and two/wire/four-wire converting circuit, have really realized all functions that user interface circuit is necessary on monolithic.System only need provide+48 volts and+5 volts of power supplys, can meet the demands the integrated level that this will reduce system cost significantly and increase substantially system.Simultaneously,, utilize the high voltage withstanding and low characteristics of thermal resistance of thick film integrated circuit, overcome the weak point of semiconductor integrated circuit technique, make the utility model circuit arrangement have high reliability owing to adopt thick film integrated circuit technology.Compare with prior art, the utility model circuit arrangement is in wireless access system, low capacity VOIP gateway system, wireless GPS and Public CDMA WLL, owing to mostly be single user or a few road user, adopt circuit arrangement of the present utility model, to make the cost of user interface part descend more than 30%, simultaneously, owing to reduced the kind of external power supply and cancelled ringing relay and the antipole relay, the integrated level and the reliability of system will be improved greatly.

Description of drawings Fig. 1 is the signal logic diagram of the utility model user interface circuit device; Fig. 2 be in the described circuit arrangement circuit 2., electrical schematic diagram 3.; Fig. 3 is a circuit electrical schematic diagram 4. in the described circuit arrangement.

Embodiment is described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing.As shown in Figure 1, user interface circuit device of the present utility model is applicable to low capacity custom system switch, comprises 1. audio frequency two/wire/four-wire converting circuit, and comprises

2. ring drives and positive antipole drive circuit;

3. ring switch and positive and negative switching circuit;

4. bidirectional constant feed circuit; Wherein circuit 2. and have two-wire to be electrically connected 3., 2. and 4., and 3. and have single line to be electrically connected 4. respectively.And 4. described circuit 1. to being to be produced on the miniature printed circuit board, and all be integrated in the thick film circuit.

Described circuit 2., as shown in Figure 2, comprise 1 four with-NOT gate logic circuit U1,1 transistor Q5 that is used for the logic inverting, and 1/2 optical coupler U2A; 25 hertz of reference signals " 25HZ " that provided by system and ring drive signal " RC " (latter is through resistance R 21) be 1 of input logic circuit U1 two input with-not gate U1A respectively, input after resistance R 21 and simultaneously of " RC " signal and-inverter that not gate U1C constitutes, the output of this inverter is connected to respectively and the input of-not gate U1D and the light-emitting diodes tube anode of optical coupler U2A, another input positive and negative utmost point drive signal of termination " RFL " of this U1D, the output of its output and U1A is connected two inputs of U1B respectively, the output of this U1B becomes drive signal " DRV1 ", becomes drive signal " DRV2 " simultaneously after transistor Q5 is anti-phase; In addition 1/2 of optical coupler U2, promptly the U2B phototriode then is serially connected with on the line between ringing telephone stations terminal " RING " and " two/wire/four-wire converting circuit ".

Described circuit 3., still as shown in Figure 2, comprise transistor Q1, Q2 and Q8～Q11, wherein Q1, Q8 and Q10, Q11 constitute full-bridge, and 48 volts of power supplys of direct current are often put upside down polarity export from two brachium pontis mid points " OUT1 " and " OUT2 ", wherein " OUT1 " connects " TIP " line of telephone sets through resistance R 6; Transistor Q1, Q2 and Q8, Q9 are the n-p-n type, the whole ground connection of emitter, and Q10 and Q11 are the p-n-p types, emitter all connects positive supply; Transistor Q2 and Q9 are connected to circuit " DRV1 " and " DRV2 " output 2. through resistance R 2 and R18 respectively, and they are as the driving tube of transistor Q10 and Q11, and its collector electrode is connected to the base stage of Q10 and Q11 respectively through resistance R 8 and R20; Described " DRV1 " and " DRV2 " output also are connected the base stage of transistor Q8 and Q1 respectively simultaneously through resistance R 17 and R1.

4. described circuit sees Fig. 3, comprises rectifier diode bridge B1, transistor Q3, Q4 and Q6, Q7, and optical coupler U4; The interchange end span connecting resistance R7 of described diode bridge B1, and the difference connecting circuit output " OUT2 " 3. and the ringing wire " RING " of telephone set, it is right that the dc output end of bridge B1 connects " Darlington " that transistor Q3-Q4 forms, wherein between the collector electrode of Q4, the emitter and cross-over connection one capacitor C 1; The light-emitting diode of optical coupler U4 also is connected on the emitter resistance R11 of Q3, the collector electrode of its phototriode connects the base stage of positive 5 volts of power supplys and transistor Q6 respectively through resistance R 13 and R14, be connected to dislodging machine testing output " SHK " terminal respectively and be connected to the base stage of transistor Q7 through resistance R 16 from the Q6 collector electrode through amplifying signal, the collector electrode of Q7 is the input of connecting circuit 1/4 and one not gate UIA 2. and two inputs of another 1/4 and one not gate UIC simultaneously then.

Detailed operation principle with regard to the utility model circuit arrangement describes now:

1. the realization of ringer function:

1.1 system provides 25 He Zhi benchmark TTL square waves for this circuit, this signal is imported from " 25HZ " 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, the reference signal that makes 25 He Zhi only just can output to 3 pin of U1A during for high level at " RC "; When 1 second high level, no matter positive antipole drive signal " RFL " is high level or low level, all masked by the low level of 8 pin of U1C output, this moment, 11 pin of U1D were exported high level, 25 He Zhi reference signals are transferred to 6 pin of U1B, obtain drive level DRV1, the inverter through being made up of Q5 obtains drive level DRV2 again.By DRV1 and DRV2 while drive circuit full-bridge switch 3. ,+48 volts of dc inversions are become 25 He Zhi alternating currents, obtain the ringing signal that effective value is about 48 volts at OUT1 end and OUT2 end, this signal is delivered to telephone set through R6, R7, makes ringing telephone stations.At this moment, because the 8 pin output low levels of U1C, the light-emitting diode of optoelectronic switch U2A does not have positive bias-voltage, makes U2B be in high-impedance state, has disconnected the loop of ringing-current and two/four line conversion fractions, to protect this partial circuit.

1.2 when 4 seconds low levels, " RC " is low level, 25 He Zhi reference signal conductively-closeds are fallen, 3 pin of U1A are high level, simultaneously because 8 pin of U1C are output as height, " RFL " signal is through the anti-phase DRV1 that outputs to, since " RFL " signal or be the height, perhaps be low, be 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, be subjected to 48 volts of direct voltages of " RFL " level control at OUT1, OUT2 end output polarity; This direct voltage forms 48 volts of direct voltages by R6 and circuit 4. (bidirectional constant feed circuit) at the telephone set two ends.At this moment, 8 pin of U1C are high, the light-emitting diode positively biased of optical coupler U2A, and U2B is in low resistive state, has realized the audio transmission under the hook state, as the display message etc. of sending a telegram here.

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

1.4 cut the realization of bell function: under 1 second ringing condition, " RC " is high, this moment is as user's off-hook, then telephone set DC load conducting, 48 volts voltages of OUT1 end and OUT2 end pass through R6 and circuit 4. (bidirectional constant feed circuit), make the conducting of telephone set DC load, the light-emitting diode positively biased of optical coupler U4, off-hook detection end " SHK " will be exported high level, be in low resistive state between the collector electrode of Q7, the emitter, even be high this moment " RC ", but 1 pin of U1A by clamped be low level, thereby a realization section bell function.

2. feed condition and positive antipole drive:

2.1 feed condition: when " RC " when signal level is low, 25 He Zhi reference signal conductively-closeds.During on-hook, because circuit 4. (bidirectional constant feed circuit) does not start, the light-emitting diode of optical coupler U4 does not have positively biased, off-hook detection end " SHK " is with output low level: during off-hook, the conducting of telephone set DC load, circuit 4. (bidirectional constant feed circuit) start, and its current settings is 23 milliamperes, this moment, the direct voltage at telephone set two ends was 6～7 volts, and telephone set enters dialing status or talking state.This moment optical coupler U4 light-emitting diode positively biased, off-hook detection end " SHK " will be exported high level.

2.2 positive antipole drives: when both call sides has the first on-hook of a side, the on-hook indication is received by system, and system will carry out the logic inverting to " RFL " end signal, and the direct voltage polarity at telephone set two ends also will be reversed this moment, thereby realize the antipole function, to drive the billing function unit.

3. audio transmission:

Under off hook state, U2B is in the interchange low resistive state, and circuit 4. (bidirectional constant feed circuit) is in the interchange high-impedance state.Four line audio frequency received signals " VR " are delivered to telephone set through four/two wire converting circuits, and the realization system is to the speech transmissions of telephone set; Telephone set is the inverse process of said process to the transmission of " VX " end, and its principle repeats no more.

Claims (5)

1. a user interface circuit device is applicable to low capacity custom system switch, comprises 1. audio frequency two/wire/four-wire converting circuit, it is characterized in that: also comprise

2. ring drives and positive antipole drive circuit;

3. ring switch and positive and negative switching circuit;

4. bidirectional constant feed circuit;

Wherein circuit 2. and have two-wire to be electrically connected 3., 2. and 4., and 3. and have single line to be electrically connected 4. respectively.

2. according to the described user interface circuit device of claim 1, it is characterized in that:

Described circuit 2. comprise 1 four with-NOT gate logic circuit U1,1 transistor Q5 that is used for the logic inverting, and 1/2 optical coupler U2A; 25 hertz of reference signals " 25HZ " that provided by system and ring drive signal " RC " (latter is through resistance R 21) be 1 of input logic circuit U1 two input with-not gate U1A respectively, input after resistance R 21 and simultaneously of " RC " signal and-inverter that not gate U1C constitutes, the output of this inverter is connected to respectively and the input of-not gate U1D and the light-emitting diodes tube anode of optical coupler U2A, another input positive and negative utmost point drive signal of termination " RFL " of this U1D, the output of its output and U1A is connected two inputs of U1B respectively, the output of this U1B becomes drive signal " DRV1 ", becomes drive signal " DRV2 " simultaneously after transistor Q5 is anti-phase; In addition 1/2 of optical coupler U2, promptly the U2B phototriode then is serially connected with on the line between ringing telephone stations terminal " RING " and " two/wire/four-wire converting circuit ".

3. according to the described user interface circuit device of claim 1, it is characterized in that:

3. described circuit comprises transistor Q1, Q2 and Q8～Q11, wherein Q1, Q8 and Q10, Q11 constitute full-bridge, and 48 volts of power supplys of direct current are often put upside down polarity export from two brachium pontis mid points " OUT1 " and " OUT2 ", wherein " OUT1 " connects " TIP " line of telephone sets through resistance R 6; Transistor Q1, Q2 and Q8, Q9 are the n-p-n type, the whole ground connection of emitter, and Q10 and Q11 are the p-n-p types, emitter all connects positive supply; Transistor Q2 and Q9 are connected to circuit " DRV1 " and " DRV2 " output 2. through resistance R 2 and R18 respectively, and they are as the driving tube of transistor Q10 and Q11, and its collector electrode is connected to the base stage of Q10 and Q11 respectively through resistance R 8 and R20; Described " DRV1 " and

" DRV2 " output and while are connected the base stage of transistor Q8 and Q1 respectively through resistance R 17 and R1.

4. according to the described user interface circuit device of claim 1, it is characterized in that:

4. described circuit comprises rectifier diode bridge B1, transistor Q3, Q4 and Q6, Q7, and optical coupler U4; The interchange end span connecting resistance R7 of described diode bridge B1, and the difference connecting circuit output " OUT2 " 3. and the ringing wire " RING " of telephone set, it is right that the dc output end of bridge B1 connects " Darlington " that transistor Q3-Q4 forms, wherein between the collector electrode of Q4, the emitter and cross-over connection one capacitor C 1; The light-emitting diode of optical coupler U4 also is connected on the emitter resistance R11 of Q3, the collector electrode of its phototriode connects the base stage of positive 5 volts of power supplys and transistor Q6 respectively through resistance R 13 and R14, be connected to dislodging machine testing output " SHK " terminal respectively and be connected to the base stage of transistor Q7 through resistance R 16 from the Q6 collector electrode through amplifying signal, the collector electrode of Q7 is the input of connecting circuit 1/4 and one not gate UIA 2. and two inputs of another 1/4 and one not gate UIC simultaneously then.

5. according to the described user interface circuit device of claim 1, it is characterized in that:

4. 1. described circuit be to be produced on the miniature printed circuit board extremely, and all be integrated in the thick film circuit.

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