CN105812590B - A kind of switching method for the long short-term feed of subscribers' line - Google Patents
A kind of switching method for the long short-term feed of subscribers' line Download PDFInfo
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- CN105812590B CN105812590B CN201610307967.3A CN201610307967A CN105812590B CN 105812590 B CN105812590 B CN 105812590B CN 201610307967 A CN201610307967 A CN 201610307967A CN 105812590 B CN105812590 B CN 105812590B
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- resistance
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- triode
- circuit
- switching circuit
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
Abstract
The present invention provides a kind of switching method for the long short-term feed of subscribers' line, and the switching method need to provide control chip SLIC and a switching circuit；When user terminal needs short-term to feed, the pin for controlling chip SLIC exports high level to switching circuit, makes the control signal of switching circuit output short-term feed；When user terminal needs long line to feed, the pin for controlling chip SLIC exports low level to switching circuit, and switching circuit is made to export the control signal of long line feed；It is user-friendly.
Description
Technical field
The present invention relates to a kind of switching methods for the long short-term feed of subscribers' line.
Background technology
Subscriber line interface circuit (hereinafter referred to as SLIC) is the interface with telephone line, is CODEC and external phone loop
Intermediary interface, it has the function of following four：
Ringing signal：Ringing-current needed for phone ring can be provided, be a negative high voltage AC signal；
Dislodging machine testing signal：It can provide microprocessor detection signal when phone dislodging machine, and microprocessor is according to this
The variation of signal plucks receiver-on-hook condition judge phone；
Voice signal interface：It has the analog voice signal interface that is connected with DTMF with CODEC, completion from phone to
Analog voice signals of the CODEC with DTMF or from CODEC to phone is connect, it is the bridge that phone is contacted with CODEC；
Subscriber line interface：Connect phone.
In communication field, usually used -30V voltages supply SLIC is used for line fed.
Prior art use -30V voltages supply SLIC and are used for line fed, and when subscribers' line is longer, the feedback
Method for electrically cannot meet feed demand.
Invention content
The technical problem to be solved in the present invention is to provide a kind of switching method for the long short-term feed of subscribers' line,
It is user-friendly.
The invention is realized in this way：A kind of switching method for the long short-term feed of subscribers' line, the switching method
Control chip SLIC and a switching circuit need to be provided；Include the following steps：
When user terminal needs short-term to feed, the pin for controlling chip SLIC exports high level to switching circuit,
Make the control signal of switching circuit output short-term feed；
When user terminal needs long line to feed, control the pin output low level of chip SLIC to switching circuit,
Switching circuit is set to export the control signal of long line feed.
Further, the switching circuit is for connecting control chip SLIC and phone；The switching circuit includes electricity
Source controls chip U1, the first control switching circuit, the second control switching circuit, chip power circuit, isolated drive circuit, filtering
Circuit, capacitance C1, capacitance C5, capacitance C10, capacitance C11, capacitance C3, capacitance C7, capacitance C9, resistance R4, resistance R3, resistance R1,
Resistance R2, inductance L1 and metal-oxide-semiconductor Q1；
The control chip SLIC is respectively connected to first control switching circuit by GPIO and the second switching is controlled
Circuit processed；
The phone is connected to first control switching circuit and filter circuit；
Second switching circuit be connected to the COMP pins of the power supply control chip U1, capacitance C10 one end with
And the one end of resistance R4；
The VCC pin of the power supply control chip U1 is separately connected the chip power circuit, capacitance C7 one ends, capacitance
C9 one ends and isolated drive circuit；
The isolated drive circuit is connected to the cathode of the source electrode of the metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1, diode D1
And the other end of inductance L1；
The VFB pins in parallel of the other end of the resistance R4, the other end of capacitance C10 and power supply control chip U1
It is connected to the one end of the resistance R1 and the one end of resistance R2 afterwards；
The filter circuit is parallel to the other end of the resistance R1 and the other end of resistance R2；
The other end of the resistance R3 is connected to the RT/CT pins and capacitance C11 of the power supply control chip U1
One end；
The other end of the capacitance C11, the other end capacitance C3, the other end capacitance C7, the other end capacitance C9, two
The anode of pole pipe D1, the other end of resistance R2, the GROUND cathodes of power supply control chip U1, the second control switching circuit and
Isolated drive circuit connects -48V voltage output ends；
The other end of the capacitance C1, the other end of capacitance C5, chip power circuit, metal-oxide-semiconductor Q1 drain electrode and
The other end of resistance R1 is grounded.
Further, first control switching circuit include triode Q5, resistance R21, resistance R11 diodes D9 and
Metal-oxide-semiconductor Q4, the resistance R21 one ends are connected to control chip SLIC, and the other end of the resistance R21 is connected to triode
The collector of Q5, the base earth of the triode Q5, the transmitter of the triode Q5 are separately connected the grid of the metal-oxide-semiconductor Q4
Pole, the cathode of diode D9 and resistance R11 the other end, the phone is separately connected the other end of the resistance R11, two poles
The anode of pipe D9 and the source electrode of metal-oxide-semiconductor Q4, the drain electrode of the metal-oxide-semiconductor Q4 are connected to -30V control sources.
Further, second control switching circuit include resistance R23, triode Q6, resistance R26, resistance R25 and
Triode Q7；The control chip SLIC is connected to the one end of the resistance R23, the other end connection of the resistance R23
To the collector of the triode Q6, the emitter of the base earth of the triode Q6, the triode Q6 passes through the electricity
Resistance R26 is separately connected the base stage of the triode Q7 and the one end of resistance R25, the resistance R25 and triode Q7's
Emitter connects -48V voltage output ends, and the collector of the triode Q7 is respectively connected to the power supply control chip U1's
The one end of COMP pins, the one end of capacitance C10 and resistance R4.
Further, the chip power circuit includes resistance R7, diode D3, capacitance C20 and triode Q2, described
The one end of resistance R7 and the collector of triode Q2 are grounded, and the other end of the resistance R7 is separately connected two pole
The cathode of pipe D3 and the base stage of triode Q2, the emitter of the triode Q2 are separately connected the one end of the capacitance C20
And the VCC pin of power supply control chip U1, the other end of the capacitance C20 connect the anode of the diode D3, isolation
Driving circuit and -48V voltage output ends.
Further, the isolated drive circuit include gate drivers U2, diode D2, capacitance C8, resistance R5 and
Resistance R6；The VDD pins of the gate drivers U2 are connected to the VCC pin of the power supply control chip U1, and the grid drives
The GND pin of dynamic device U2 connects -48V voltage output ends, and the VCC pin of the power supply control chip U1 is connected by the diode D2
It is connected to the VB pins of the gate drivers U2 and the one end of capacitance C8, the other end of the capacitance C8 is connected to described
The pin HO of the one end of resistance R6 and the pin VS, the gate drivers U2 of gate drivers U2 pass through the resistance R5
It is connected to the other end of the resistance R6 and the grid of metal-oxide-semiconductor Q1, the pin VS of the gate drivers U2 is connected to institute
State the cathode of the source electrode of metal-oxide-semiconductor Q1, the one end of inductance L1 and diode D1.
Further, the filter circuit includes capacitance C2 and capacitance C12；One end of the capacitance C2 and the capacitance
The other end of the resistance R1 is connected to after one end parallel connection of C12, the other end of the capacitance C2 is another with the capacitance C12's
The other end and the phone of the resistance R2 are connected to after the parallel connection of one end.
The invention has the advantages that：A kind of switching method for the long short-term feed of subscribers' line of the present invention, makes user
Feeding classification can be voluntarily selected, to meet the different feed demands of long short-term road in communicating circuit.
Description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is a kind of flow chart of switching method for the long short-term feed of subscribers' line of the present invention.
Fig. 2 is the circuit diagram of switching circuit in the present invention.
Specific implementation mode
As shown in Figure 1, switching method of the present invention for the long short-term feed of subscribers' line, the switching method need to provide control
Coremaking piece SLIC and a switching circuit；Include the following steps：
When user terminal needs short-term to feed, the pin for controlling chip SLIC exports high level to switching circuit,
Make the control signal of switching circuit output short-term feed；
When user terminal needs long line to feed, control the pin output low level of chip SLIC to switching circuit,
Switching circuit is set to export the control signal of long line feed.
As shown in Fig. 2, switching circuit in the present invention, for connecting control chip SLIC and phone；The switching circuit
Further include the first control switching circuit, the second control switching circuit, chip power circuit, isolation including power supply control chip U1
Driving circuit, filter circuit, capacitance C1, capacitance C5, capacitance C10, capacitance C11, capacitance C3, capacitance C7, capacitance C9, resistance R4,
Resistance R3, resistance R1, resistance R2, inductance L1 and metal-oxide-semiconductor Q1；
The control chip SLIC is respectively connected to first control switching circuit by GPIO and the second switching is controlled
Circuit processed；
The phone is connected to first control switching circuit and filter circuit；
Second switching circuit be connected to the COMP pins of the power supply control chip U1, capacitance C10 one end with
And the one end of resistance R4；
The VCC pin of the power supply control chip U1 is separately connected the chip power circuit, capacitance C7 one ends, capacitance
C9 one ends and isolated drive circuit；
The isolated drive circuit is connected to the cathode of the source electrode of the metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1, diode D1
And the other end of inductance L1；
The VFB pins in parallel of the other end of the resistance R4, the other end of capacitance C10 and power supply control chip U1
It is connected to the one end of the resistance R1 and the one end of resistance R2 afterwards；
The filter circuit is parallel to the other end of the resistance R1 and the other end of resistance R2；
The other end of the resistance R3 is connected to the RT/CT pins and capacitance C11 of the power supply control chip U1
One end；
The other end of the capacitance C11, the other end capacitance C3, the other end capacitance C7, the other end capacitance C9, two
The anode of pole pipe D1, the other end of resistance R2, the GROUND cathodes of power supply control chip U1, the second control switching circuit and
Isolated drive circuit connects -48V voltage output ends；
The other end of the capacitance C1, the other end of capacitance C5, chip power circuit, metal-oxide-semiconductor Q1 drain electrode and
The other end of resistance R1 is grounded.
First control switching circuit includes triode Q5, resistance R21, resistance R11 diodes D9 and metal-oxide-semiconductor Q4,
The other end that the resistance R21 one ends are connected to control chip SLIC, the resistance R21 is connected to the current collection of triode Q5
The transmitter of pole, the base earth of the triode Q5, the triode Q5 is separately connected the grid of the metal-oxide-semiconductor Q4, two poles
The cathode of pipe D9 and the other end of resistance R11, the phone are separately connected the other end of the resistance R11, diode D9
The drain electrode of the source electrode of anode and metal-oxide-semiconductor Q4, the metal-oxide-semiconductor Q4 is connected to -30V control sources.
Second control switching circuit includes resistance R23, triode Q6, resistance R26, resistance R25 and triode Q7；
The control chip SLIC is connected to the one end of the resistance R23, and the other end of the resistance R23 is connected to three pole
The emitter of the collector of pipe Q6, the base earth of the triode Q6, the triode Q6 is connected respectively by the resistance R26
Connecing the base stage of the triode Q7 and the one end of resistance R25, the emitter of the resistance R25 and triode Q7 connects-
48V voltage output ends, the collector of the triode Q7 are respectively connected to COMP pins, the capacitance of the power supply control chip U1
The one end of C10 and the one end of resistance R4.
The chip power circuit includes resistance R7, diode D3, capacitance C20 and triode Q2, the resistance R7's
The collector of one end and triode Q2 are grounded, and the other end of the resistance R7 is separately connected the moon of the diode D3
The emitter of the base stage of pole and triode Q2, the triode Q2 is separately connected the one end and power supply of the capacitance C20
The VCC pin of chip U1 is controlled, the other end of the capacitance C20 connects anode, the isolated drive circuit of the diode D3
And -48V voltage output ends.
The isolated drive circuit includes gate drivers U2, diode D2, capacitance C8, resistance R5 and resistance R6；Institute
The VDD pins for stating gate drivers U2 are connected to the VCC pin of the power supply control chip U1, the gate drivers U2's
GND pin connects -48V voltage output ends, and the VCC pin of the power supply control chip U1 is connected to described by the diode D2
The other end of the VB pins of gate drivers U2 and the one end of capacitance C8, the capacitance C8 is connected to the resistance R6's
The pin HO of the pin VS, the gate drivers U2 of one end and gate drivers U2 are connected to institute by the resistance R5
The other end of resistance R6 and the grid of metal-oxide-semiconductor Q1 are stated, the pin VS of the gate drivers U2 is connected to the metal-oxide-semiconductor Q1
Source electrode, the one end of inductance L1 and the cathode of diode D1.
The filter circuit includes capacitance C2 and capacitance C12；One end of one end of the capacitance C2 and the capacitance C12
The other end of the resistance R1 is connected to after parallel connection, the other end of the capacitance C2 is in parallel with the other end of capacitance C12
It is connected to the other end and the phone of the resistance R2 afterwards.
Chip SLIC is controlled by controlling the first control switching circuit and the second control switching circuit come so as to phone
Power supply converted between -30V and -48V, meet user use.Wherein power supply control chip U1 passes through isolation drive electricity
Road drives metal-oxide-semiconductor Q1 switches；And by resistance R1 and resistance R2 carry out partial pressure obtain reference voltage, according to the reference voltage come
Control the voltage of output.
As shown in Figure 1, the present invention uses the switching of GPIO control circuits, to realize the need of different line fed modes
It asks.
When subscribers' line is shorter, by controlling the interface of chip SLIC, the GPIO pin in figure is set to high level, is made
It obtains triode Q6, Q7 to be both turned on, the COMP pins of power supply control chip U1 is connect into -48V voltage output ends so that -30V turns -48V
Power supply does not work.Meanwhile triode Q5 conductings, metal-oxide-semiconductor Q4 grid voltages are more than cut-in voltage so that metal-oxide-semiconductor Q4 conductings, -30V
Circuit input be directly output to the ends -48V.
When subscribers' line is longer, by controlling the I/O port of chip SLIC, the GPIO pin in figure is set to low level, is made
Obtain triode Q5 cut-offs, metal-oxide-semiconductor Q4 cut-offs；Meanwhile triode Q6, Q7 cut-off, -30V turns -48V power supplys normal work, for long line
Circuit provides effective feed.
Although specific embodiments of the present invention have been described above, those familiar with the art should manage
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field modification and variation equivalent made by the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (6)
1. a kind of switching method for the long short-term feed of subscribers' line, it is characterised in that：The switching method need to provide control
Chip SLIC and a switching circuit；Include the following steps：
When user terminal needs short-term to feed, the pin for controlling chip SLIC exports high level to switching circuit, makes to cut
Change the control signal of circuit output short-term feed；
When user terminal needs long line to feed, the pin for controlling chip SLIC exports low level to switching circuit, makes to cut
Change the control signal of the long line feed of circuit output；
The switching circuit is for connecting control chip SLIC and phone；The switching circuit include power supply control chip U1,
First control switching circuit, the second control switching circuit, chip power circuit, isolated drive circuit, filter circuit, capacitance C1,
Capacitance C5, capacitance C10, capacitance C11, capacitance C3, capacitance C7, capacitance C9, resistance R4, resistance R3, resistance R1, resistance R2, inductance
L1 and metal-oxide-semiconductor Q1；
The control chip SLIC is respectively connected to first control switching circuit and the second switching control electricity by GPIO
Road；
The phone is connected to first control switching circuit and filter circuit；
Second switching circuit is connected to the one end and electricity of the COMP pins of the power supply control chip U1, capacitance C10
Hinder the one end of R4；
The VCC pin of the power supply control chip U1 is separately connected the chip power circuit, capacitance C7 one ends, capacitance C9 mono-
End and isolated drive circuit；
The isolated drive circuit be connected to the source electrode of the metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1, diode D1 cathode and
The other end of inductance L1；
Connect after the VFB pins in parallel of the other end of the resistance R4, the other end of capacitance C10 and power supply control chip U1
It is connected to the one end of the resistance R1 and the one end of resistance R2；
The filter circuit is parallel to the other end of the resistance R1 and the other end of resistance R2；
The other end of the resistance R3 is connected to the RT/CT pins of the power supply control chip U1 and one end of capacitance C11
Portion；
The other end of the capacitance C11, the other end capacitance C3, the other end capacitance C7, the other end capacitance C9, diode
The anode of D1, the other end of resistance R2, the GROUND cathodes of power supply control chip U1, the second control switching circuit and isolation
Driving circuit connects -48V voltage output ends；
The other end of the capacitance C1, the other end of capacitance C5, chip power circuit, the drain electrode of metal-oxide-semiconductor Q1 and resistance
The other end of R1 is grounded.
2. a kind of switching method for the long short-term feed of subscribers' line according to claim 1, it is characterised in that：It is described
First control switching circuit includes triode Q5, resistance R21, resistance R11 diodes D9 and metal-oxide-semiconductor Q4, the resistance R21 mono-
The other end that end is connected to control chip SLIC, the resistance R21 is connected to the collector of triode Q5, the triode
The base earth of Q5, the transmitter of the triode Q5 be separately connected the grid of the metal-oxide-semiconductor Q4, diode D9 cathode and
The other end of resistance R11, the phone are separately connected the other end of the resistance R11, the anode of diode D9 and metal-oxide-semiconductor Q4
Source electrode, the drain electrode of the metal-oxide-semiconductor Q4 is connected to -30V control sources.
3. a kind of switching method for the long short-term feed of subscribers' line according to claim 1, it is characterised in that：It is described
Second control switching circuit includes resistance R23, triode Q6, resistance R26, resistance R25 and triode Q7；The control chip
SLIC is connected to the one end of the resistance R23, and the other end of the resistance R23 is connected to the current collection of the triode Q6
The emitter of pole, the base earth of the triode Q6, the triode Q6 is separately connected three pole by the resistance R26
The emitter of the base stage of pipe Q7 and the one end of resistance R25, the resistance R25 and triode Q7 connect -48V voltage outputs
End, the collector of the triode Q7 are respectively connected to the one end of the COMP pins of the power supply control chip U1, capacitance C10
And the one end of resistance R4.
4. a kind of switching method for the long short-term feed of subscribers' line according to claim 1, it is characterised in that：It is described
Chip power circuit includes resistance R7, diode D3, capacitance C20 and triode Q2, the one end and three of the resistance R7
The collector of pole pipe Q2 is grounded, and the other end of the resistance R7 is separately connected the cathode and triode of the diode D3
The base stage of Q2, the emitter of the triode Q2 are separately connected the one end and power supply control chip U1 of the capacitance C20
The other end of VCC pin, the capacitance C20 connects the anode, isolated drive circuit and -48V voltages of the diode D3
Output end.
5. a kind of switching method for the long short-term feed of subscribers' line according to claim 1, it is characterised in that：It is described
Isolated drive circuit includes gate drivers U2, diode D2, capacitance C8, resistance R5 and resistance R6；The gate drivers
The VDD pins of U2 are connected to the VCC pin of the power supply control chip U1, and the GND pin of the gate drivers U2 meets -48V
The VCC pin of voltage output end, the power supply control chip U1 is connected to the gate drivers U2 by the diode D2
VB pins and capacitance C8 one end, the other end of the capacitance C8 is connected to the one end and grid of the resistance R6
The pin HO of the pin VS, the gate drivers U2 of driver U2 are connected to the another of the resistance R6 by the resistance R5
The grid of one end and metal-oxide-semiconductor Q1, the pin VS of the gate drivers U2 are connected to source electrode, the inductance of the metal-oxide-semiconductor Q1
The one end of L1 and the cathode of diode D1.
6. a kind of switching method for the long short-term feed of subscribers' line according to claim 1, it is characterised in that：It is described
Filter circuit includes capacitance C2 and capacitance C12；It is connected to after one end of the capacitance C2 is in parallel with described one end of capacitance C12
The other end of the resistance R1 is connected to described after the other end of the capacitance C2 is in parallel with the other end of capacitance C12
The other end of resistance R2 and phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610307967.3A CN105812590B (en) | 2016-05-11 | 2016-05-11 | A kind of switching method for the long short-term feed of subscribers' line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610307967.3A CN105812590B (en) | 2016-05-11 | 2016-05-11 | A kind of switching method for the long short-term feed of subscribers' line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105812590A CN105812590A (en) | 2016-07-27 |
| CN105812590B true CN105812590B (en) | 2018-10-12 |
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ID=56455954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610307967.3A Active CN105812590B (en) | 2016-05-11 | 2016-05-11 | A kind of switching method for the long short-term feed of subscribers' line |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH586983A5 (en) * | 1974-12-23 | 1977-04-15 | Ibm | |
| US6301358B1 (en) * | 1998-05-29 | 2001-10-09 | Avaya Technology Corp. | Dual-slope current battery-feed circuit |
| CN100512327C (en) * | 2005-11-09 | 2009-07-08 | 杭州华三通信技术有限公司 | Feeding circuit, method of providing different feed voltage and front end feed device |
| CN101282390B (en) * | 2007-04-02 | 2013-01-02 | 华为技术有限公司 | Feed method, system and equipment |
| US9711963B2 (en) * | 2010-11-09 | 2017-07-18 | Telefonaktiebolaget L M Ericsson (Publ) | Subscriber line power distribution system |
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2016
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Address after: Software Park Siming District of Xiamen city in Fujian province 361000 two sunrise Road No. 56 unit 1001 Patentee after: Fujian Xingwang Intelligent Technology Co., Ltd Address before: Software Park Siming District of Xiamen city in Fujian province 361000 two sunrise Road No. 56 unit 1001 Patentee before: FUJIAN STAR-NET WISDOM TECHNOLOGY Co.,Ltd. |
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