CN1026746C

CN1026746C - Program controlled magneto system telephone user exchange system

Info

Publication number: CN1026746C
Application number: CN 92109539
Authority: CN
Inventors: 周锦玉; 孙仕富; 李霁野; 徐晓江
Original assignee: 61st Research Institute Of Ministry Of Communications General Staff Of Pla; National Space Science Center of CAS
Current assignee: 61st Research Institute Of Ministry Of Communications General Staff Of Pla; National Space Science Center of CAS
Priority date: 1992-08-21
Filing date: 1992-08-21
Publication date: 1994-11-23
Anticipated expiration: 2007-08-21
Also published as: CN1070527A

Abstract

The present invention relates to an exponential curve type soft starting circuit for a pulse width modulation type switching power supply. The in-phase input terminal of an error amplifier of a pulse width modulation integrated device is connected with an electronic circuit, wherein the voltage of the electronic circuit rises according to the rules of an exponential curve after voltage is applied to the electronic circuit; consequently, the exponential curve type soft starting circuit is realized. The exponential curve type soft starting circuit has the advantages of simple circuit design and few components and solves the problem of high current impact during the start-up of a switching power supply. The exponential curve type soft starting circuit is applicable to not only SG3525A chips but also other pulse width modulation type switching power supplies.

Description

Program controlled magneto system telephone user exchange system

The invention belongs to communication, particularly the program controlled user telephone exchange.

Traditional program controlled user telephone exchange, main terminal is the common-battery dial telephone set, mobile phone has been plucked, has been puted down the hook switch that makes phone and upspring, depresses, and produces off-hook, on-hook signaling.Because phone load impedance difference during the dislodging machine, the load current that is produced on exchanger user interface board circuit will be different, so the picking/hanging machine detection circuit of interface circuit can record dislodging machine state.During subscriber dialing, in accordance with regulations disconnected, continuous than the on-off action that sends respective number of phone makes it to produce time sequential pulse voltage on exchanger user interface board circuit, by the switch digit receiver, declare dial the number, this common-battery phone possesses the programme-controlled exchange condition.

Magneto telephone set so can not produce the dialing time sequential pulse on conventional exchange interface circuit, does not have hook switch to produce dislodging machine signaling owing to do not want power supply for exchange yet.The magnetite phone is by after operator and the corresponding calling subscriber conversation, by caller want called, make it to continue mutually, the operator withdraws from, and finishes session services one time, the user talks about the Bi Huiling automatic clearing.See the product SB-4170/TT of Canadian Marconi Co..

The objective of the invention is to make the magnetite phone to dial directly by programme-controlled exchange the whole network, kept magnetite phone mobility strong again, the advantage of power saving.

Main feature of the present invention is that magnetite user board 6 one ends are connected with switching matrix 5, the other end is connected with the magnetite phone 10 that can dial, switching matrix 5 is linked on the local network 11 by DCC user interface 7, the said magnetite phone 10 that dials is rung a bell as caller and is sent when calling out, user board 6 produces the off-hook signaling, CPU board 1 is after confirming that off-hook effectively, the dialing tone of letter sound network 9 is added on the switching matrix 5, to believe that by user board 6 the sound coupling outputs on the local battery apparatus 10 that can dial again, magnetite phone 10 can be dialled needed number, with the other side's conversation, words Bi Huiling automatic clearing.

The present invention had both kept the original power saving of magnetite phone, motor-driven advantage, made it can be program control again, and can with local network or the networking of higher level's net, than long three times of power supply phone speech range, be specially adapted to field and some special occasions.

Figure one is a switch complete machine block diagram.

Among the figure 1 be CPU, 2 for cpu i/f, 3 are local network for the magnetite phone that can dial, 11 for letter sound network, 10 for wireless subscriber interface, 9 for DCC user interface, 8 for magnetite user interface, 7 for switching matrix, 6 for power supply, 5 for operator, 4.

Figure two is a magnetite user board line map.

1-1 is that magnetic latching relay, 2-1 are that relay, 3-1 are that dislodging machine testing circuit, 6-1 are that control Driver Circuit, 10-1 are transformer among the figure.

Figure three is magneto telephone adapter circuit diagram.

1-2 is that dialing keyboard, 2-2 are that impulse sender, 3-2 are that operational amplifier, 4-2,5-2 are that balanced amplifier, 6-2 are supply convertor among the figure.

Discuss the present invention in detail below in conjunction with accompanying drawing.

Know by Fig. 1, the magneto phone that can dial sends when calling out as if ringing a bell as caller, the dislodging machine testing circuit of magneto phone user board 6, produce the off-hook signaling, CPU1, cpu i/f 2 is after confirming that off-hook effectively, CPU1 will believe that the dialing tone of sound network 9 is added on the switching matrix 5, to believe that by user board 6 the sound coupling outputs to the magnetite phone 10 that can dial again, CPU1 distributes an idle digit receiver in the letter sound network 9 to give calling subscriber 10 simultaneously, if the magnetite phone that can dial sends desired being called out the numbers, after digit receiver in the letter sound network 9 is received, CPU1 keeps in it, discharges digit receiver thereupon, and finds out the idle link of switching matrix 5, calling and called are continued, mutually conversation.Words finish, caller or called ringing a bell, and on-hook is taken out stitches.

Know that by figure two user's ringing voltage that produces of ringing a bell is added to dislodging machine testing circuit through rectifier bridge, and delivers to the cpu i/f circuit, dislodging machine testing circuit one is exported as voltage, expression beginning off-hook, as long as ringing voltage 〉=12Vrms, duration 〉=100ms is effective off-hook; When caller stopped to ring a bell, when detecting ringing voltage and returning zero, CPU thought that promptly off-hook finishes.CPU control letter sound network 9 is added to relevant signal tone on the transformer 10-1, delivers to the user through a, b line again.The dialing that a, b line send also is coupled to letter sound network 9 through transformer 10-1 and is delivered to digit receiver, and words Bi Huiling confirms as on-hook by CPU1.During connection, CPU1 adds-5 for the magnetizing coil of magnetic latching relay 1-1 through driver circuit 6-1 ^Mx.15 ^MADriving pulse, it is moving runs jointly to close and connects, a, b line are linked transformer 10-1 again through switching matrix 5, and speech path is connected to the associated user.CPU1 controlling and driving circuit is given the degaussion coil-5 of relay 1-1 ^Mx.15 ^MAPulse, its back contact is connected, and reaches the purpose of taking out stitches.When static or when finishing wiring, the operating current of interface board 6≤80 ^{μ A}

Resistance R ₁₈.R ₃₇Be used for the weakening after the ring.Because the user interface circuit is when the ringing-current that receiving terminal is sent, capacitor C ₁₅, C ₁₇Discharge and recharge and can produce the above remained shock of secondary, derive the false signaling of dislodging machine, cause the switch cisco unity malfunction.

Figure three is depicted as magnetite phone dialing adapter.Adapter uses the power supply of phone itself.The dial signaling line of adapter is received on a, b line of phone.The dialing adapter adopts dual-tone multifrequency (DTmF) dialing standard.The magnetite phone has only the power supply of two batteries, after boosting through supply convertor 6-2, just can make impulse sender 2-2, amplifier 3-2, balanced amplifier 4-2,5-2 obtain normal operating voltage; Battery after voltage descends, because supply convertor 6-2 is arranged, has just guaranteed that device 2-2,3-2,4-2,5-2 have the operating voltage of certain value with for a long time simultaneously.In the dial key box printed wiring board is arranged, 3 * 4 tactile keyboards are equipped with in the keyboard case front, and the contact switch of keyboard is a double-pole single-throw (D.P.S.T.).One cutter is as dialing, and another cutter unclamps button and promptly cuts off the power supply as mains switch.Therefore, during dialing only in dialing moment power consumption.The touch key-press of this kind mode can reach purpose of power saving.DTmF impulse sender 2.Adopt 2559 integrated circuits, the DTmF signals of 2559 outputs amplify through amplifier 3-2, and balanced amplifier 4-2,5-2 are transformed to the symmetric double end signal with the single-ended signal of amplifier 3-2 and export a, b line to.Suitably select C for use ₅, C ₆, R ₃, R ₄Value, make circuit bigger impedance be arranged to the 90v25Hz ringing signal that a, b line come, the DTmF signal of 697-1633Hz is had less output impedance.The DTmF signal of adapter output, its frequency, frequency deviation, level, level are inclined to one side etc. all meets national standard.2 of a, b can bear 600V voltage, moment power consumption≤6mA.Do not change any structure of magnetite phone, adapter can be installed, do not influence the electric property and the parameter of magnetite phone after the installation.

Switch has used the speech digital signal processing theory also according to the speech recognition mode, has designed wireless subscriber interface, and exchange function and simplex radio platform net communicate automatically.This switch system also is connected to operator's control board, under some special situations, can control the continuing of phone by the operator, programmes, privilege is provided with etc., to satisfy special needs.

Claims

1, a kind of program controlled magneto system telephone user exchange system, it comprises the central processor CPU 1 of controlling described system works, cpu i/f 2, with be used to provide dialing tone and receive called subscriber's number letter sound network 9, and switching matrix 5, described CPU1 is when confirming that off-hook is effective, and control will believe that the dialing tone that sound network 9 provides is added on the switching matrix 5, it is characterized in that described system further comprises:

The magnetite phone 10 that can dial can be transferred to called number when it sends when calling out;

User board 6 is used to produce the off-hook signaling, and the letter sound coupling that switching matrix 5 provides is outputed on the magnetite phone 10 that can dial.

2, it is characterized in that by the described switch system of claim 1 switching matrix 5 links on the local network 11 by DCC trunk interface 7, but make the direct dialing of magnetite phone the whole network.

3, it is characterized in that in the described magnetite user board 6 transformer 10-1 being arranged by the described switch system of claim 1, the one end is connected with letter sound network 9 with switching matrix 5 respectively, the other end is connected with magnetic latching relay 1-1, and pass through relay 2-1 to substation, control Driver Circuit 6-1 is arranged, the one end is connected with CPU1, and the other end is connected with relay 2-1 with magnetic latching relay 1-1 respectively.

4, by the described switch system of claim 3, it is characterized in that R ₁₈C ₁₇Be connected in parallel on the end of transformer 10-1, R ₃₇, C ₁₅Be connected in parallel on the rectification circuit.

5, by the described switch system of claim 1, it is characterized in that the said magnetite phone that dials comprises dialer, the one end is connected with the power supply of magnetite phone, the other end links to each other with a, b line, supply convertor 6-2 is with magnetite phone power supply as impulse sender 2-2 and back amplifier after taking the supply voltage rising, also comprise amplifier 3-2, balanced amplifier 4-2 and 5-2, the signal that this amplifier 3-2 comes impulse sender 2-2 amplify the back and output to subscribers feeder a, b by balanced amplifier 4-2 and 5-2.

6, it is characterized in that by the described switch system of claim 5 the used contact switch of dialer 1-2 is a double-pole single throw.