CN205792854U - A kind of switching circuit for subscribers' line long short-term feed - Google Patents
A kind of switching circuit for subscribers' line long short-term feed Download PDFInfo
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- CN205792854U CN205792854U CN201620421348.2U CN201620421348U CN205792854U CN 205792854 U CN205792854 U CN 205792854U CN 201620421348 U CN201620421348 U CN 201620421348U CN 205792854 U CN205792854 U CN 205792854U
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- switching circuit
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- control chip
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Abstract
This utility model provides a kind of switching circuit for subscribers' line long short-term feed, is used for connecting control chip SLIC and phone；Described switching circuit includes power supply control chip U1, it is characterised in that: also include the first control switching circuit, the second control switching circuit, chip power circuit, isolated drive circuit, filter circuit, electric capacity C1, electric capacity C5, electric capacity C10, electric capacity C11, electric capacity C3, electric capacity C7, electric capacity C9, resistance R4, resistance R3, resistance R1, resistance R2, inductance L1 and metal-oxide-semiconductor Q1；User-friendly.
Description
Technical field
This utility model relates to a kind of switching circuit, refers in particular to a kind of for subscribers' line long short-term feed
Switching circuit.
Background technology
SLIC (hereinafter referred to as SLIC) is the interface with telephone line, be CODEC with
The intermediary interface of external phone loop, it has a following function:
Ringing signal: be provided that the ringing-current needed for phone ring, is a negative high voltage AC signal；
Dislodging machine testing signal: it is provided that microprocessor detection signal during phone dislodging machine, micro-process
Device plucks receiver-on-hook condition according to what phone was judged in the change of this signal；
Voice signal interface: it has the analog voice signal interface being connected with CODEC with DTMF,
Complete to be connected with DTMF or the analog voice signal from CODEC to phone from phone to CODEC,
It is the bridge that phone contacts with CODEC；
Subscriber line interface: connect phone；
At communication field, generally use-30V voltage supply SLIC for line fed.
Prior art uses-30V voltage supply SLIC to be used for line fed, and longer at subscribers' line
Time, this feeding classification can not meet feed demand
Summary of the invention
The technical problems to be solved in the utility model, is that providing a kind of feeds for the long short-term of subscribers' line
Switching circuit, it is simple to user use.
This utility model is achieved in that a kind of switching circuit for subscribers' line long short-term feed,
For connecting control chip SLIC and phone；Described switching circuit includes power supply control chip U1, also
Including the first control switching circuit, the second control switching circuit, chip power circuit, isolated drive circuit,
Filter circuit, electric capacity C1, electric capacity C5, electric capacity C10, electric capacity C11, electric capacity C3, electric capacity C7,
Electric capacity C9, resistance R4, resistance R3, resistance R1, resistance R2, inductance L1 and metal-oxide-semiconductor Q1；
Described control chip SLIC is respectively connecting to described first control switching circuit, the second switching control
Circuit, one end of electric capacity C1, electric capacity C5 one end and inductance L1 one end；
Described phone is connected to described first control switching circuit and filter circuit；
Described second switching circuit is connected to the COMP pin of described power supply control chip U1, electric capacity C10
One end and the one end of resistance R4；
The VCC pin of described power supply control chip U1 connects described chip power circuit, resistance respectively
R3 one end, electric capacity C3 one end, electric capacity C7 one end, electric capacity C9 one end and isolation drive
Circuit；
Described isolated drive circuit be connected to the source electrode of described metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1,
The negative electrode of diode D1 and the other end of inductance L1；
The other end of described resistance R4, the other end of electric capacity C10 and power supply control chip U1
VFB pins in parallel after be connected to one end and the one end of resistance R2 of described resistance R1；
Described filter circuit is parallel to the other end and the other end of resistance R2 of described resistance R1；
The other end of described resistance R3 be connected to the RT/CT pin of described power supply control chip U1 with
And the one end of electric capacity C11；
The other end of described electric capacity C11, electric capacity C3 the other end, electric capacity C7 the other end, electricity
Hold C9 the other end, the anode of diode D1, the other end of resistance R2, power supply control chip
The GROUND negative electrode of U1, the second control switching circuit and the equal ground connection of isolated drive circuit；
The other end of described electric capacity C1, the other end of electric capacity C5, chip power circuit, MOS
The drain electrode of pipe Q1 and the equal ground connection in the other end of resistance R1.
Further, described first control switching circuit includes audion Q5, resistance R21, resistance R11
Diode D9 and metal-oxide-semiconductor Q4, described resistance R21 one end is connected to control chip SLIC, institute
The other end stating resistance R21 is connected to the colelctor electrode of audion Q5, the base stage of described triode Q5
Ground connection, the transmitter of described audion Q5 connects the grid of described metal-oxide-semiconductor Q4, diode respectively
The negative electrode of D9 and the other end of resistance R11, described phone connects another of described resistance R11 respectively
End, the anode of diode D9 and the source electrode of metal-oxide-semiconductor Q4, the drain electrode of described metal-oxide-semiconductor Q4 is even
It is connected to control chip SLIC.
Further, described second control switching circuit include resistance R23, triode Q6, resistance R26,
Resistance R25 and audion Q7；Described control chip SLIC is connected to the one end of described resistance R23,
The other end of described resistance R23 is connected to the colelctor electrode of described audion Q6, described audion Q6
Base earth, the emitter stage of described audion Q6 connects described three poles respectively by described resistance R26
The base stage of pipe Q7 and the one end of resistance R25, described resistance R25 and the transmitting of audion Q7
Extremely all ground connection, the colelctor electrode of described audion Q7 is respectively connecting to described power supply control chip U1's
COMP pin, the one end of electric capacity C10 and the one end of resistance R4.
Further, described chip power circuit include resistance R7, diode D3, electric capacity C20 and
The one end of audion Q2, described resistance R7 and the equal ground connection of colelctor electrode of audion Q2, described electricity
The other end of resistance R7 connects negative electrode and the base stage of audion Q2 of described diode D3, institute respectively
The emitter stage stating audion Q2 connects one end and the power supply control chip U1 of described electric capacity C20 respectively
VCC pin, the other end of described electric capacity C20 connects anode and the ground connection of described diode D3.
Further, described isolated drive circuit include gate drivers U2, diode D2, electric capacity C8,
Resistance R5 and resistance R6；The VDD pin of described gate drivers U2 is connected to described power supply and controls
The VCC pin of chip U1, the GND pin ground connection of described gate drivers U2, described power supply control
The VCC pin of coremaking sheet U1 is connected to the VB of described gate drivers U2 by described diode D2
Pin and the one end of electric capacity C8, the other end of described electric capacity C8 is connected to described resistance R6's
The pin VS of one end and gate drivers U2, the pin HO of described gate drivers U2 pass through
Described resistance R5 is connected to the other end and the grid of metal-oxide-semiconductor Q1 of described resistance R6, described
The pin VS of gate drivers U2 is connected to the source electrode of described metal-oxide-semiconductor Q1, one end of inductance L1
Portion and the negative electrode of diode D1.
Further, described filter circuit includes electric capacity C2 and electric capacity C12；The one of described electric capacity C2
Hold in parallel with one end of described electric capacity C12 after be connected to the other end of described resistance R1, described electric capacity
The other end of described resistance R2 it is connected to after the other end of C2 is in parallel with the other end of described electric capacity C12
And phone.
The utility model has the advantage of: a kind of cutting for subscribers' line long short-term feed of this utility model
Change circuit, by a switching circuit, make user can select feeding classification voluntarily, thus meet communication
The different feed demands of long short-term road in circuit.
Accompanying drawing explanation
This utility model is further described the most in conjunction with the embodiments.
Fig. 1 is the circuit diagram of a kind of switching circuit for subscribers' line long short-term feed of this utility model.
Detailed description of the invention
Referring to shown in Fig. 1, this utility model, for the switching circuit of subscribers' line long short-term feed, is used
In connecting control chip SLIC and phone；Described switching circuit includes power supply control chip U1, also wraps
Include the first control switching circuit, the second control switching circuit, chip power circuit, isolated drive circuit,
Filter circuit, electric capacity C1, electric capacity C5, electric capacity C10, electric capacity C11, electric capacity C3, electric capacity C7,
Electric capacity C9, resistance R4, resistance R3, resistance R1, resistance R2, inductance L1 and metal-oxide-semiconductor Q1；
Described control chip SLIC is respectively connecting to described first control switching circuit, the second switching control
Circuit, one end of electric capacity C1, electric capacity C5 one end and inductance L1 one end；
Described phone is connected to described first control switching circuit and filter circuit；
Described second switching circuit is connected to the COMP pin of described power supply control chip U1, electric capacity C10
One end and the one end of resistance R4；
The VCC pin of described power supply control chip U1 connects described chip power circuit, resistance respectively
R3 one end, electric capacity C3 one end, electric capacity C7 one end, electric capacity C9 one end and isolation drive
Circuit；
Described isolated drive circuit be connected to the source electrode of described metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1,
The negative electrode of diode D1 and the other end of inductance L1；
The other end of described resistance R4, the other end of electric capacity C10 and power supply control chip U1
VFB pins in parallel after be connected to one end and the one end of resistance R2 of described resistance R1；
Described filter circuit is parallel to the other end and the other end of resistance R2 of described resistance R1；
The other end of described resistance R3 be connected to the RT/CT pin of described power supply control chip U1 with
And the one end of electric capacity C11；
The other end of described electric capacity C11, electric capacity C3 the other end, electric capacity C7 the other end, electricity
Hold C9 the other end, the anode of diode D1, the other end of resistance R2, power supply control chip
The GROUND negative electrode of U1, the second control switching circuit and the equal ground connection of isolated drive circuit；
The other end of described electric capacity C1, the other end of electric capacity C5, chip power circuit, MOS
The drain electrode of pipe Q1 and the equal ground connection in the other end of resistance R1.
Described first control switching circuit includes audion Q5, resistance R21, resistance R11 diode D9
And metal-oxide-semiconductor Q4, described resistance R21 one end is connected to control chip SLIC, described resistance R21
The other end be connected to the colelctor electrode of audion Q5, the base earth of described triode Q5, described three
The transmitter of pole pipe Q5 connect respectively the grid of described metal-oxide-semiconductor Q4, the negative electrode of diode D9 and
The other end of resistance R11, described phone connects the other end of described resistance R11, diode D9 respectively
Anode and the source electrode of metal-oxide-semiconductor Q4, the drain electrode of described metal-oxide-semiconductor Q4 is connected to control chip
SLIC。
Described second control switching circuit includes resistance R23, triode Q6, resistance R26, resistance R25
And audion Q7；Described control chip SLIC is connected to the one end of described resistance R23, described electricity
The other end of resistance R23 is connected to the colelctor electrode of described audion Q6, the base stage of described audion Q6
Ground connection, the emitter stage of described audion Q6 connects described audion Q7 respectively by described resistance R26
Base stage and the one end of resistance R25, the emitter stage of described resistance R25 and audion Q7 all connects
Ground, the colelctor electrode of described audion Q7 is respectively connecting to the COMP of described power supply control chip U1 and draws
Foot, the one end of electric capacity C10 and the one end of resistance R4.
Described chip power circuit includes resistance R7, diode D3, electric capacity C20 and audion Q2,
The one end of described resistance R7 and the equal ground connection of colelctor electrode of audion Q2, another of described resistance R7
End connects negative electrode and the base stage of audion Q2 of described diode D3, described audion Q2 respectively
The VCC of the emitter stage one end and power supply control chip U1 that connect described electric capacity C20 respectively draw
Foot, the other end of described electric capacity C20 connects anode and the ground connection of described diode D3.
Described isolated drive circuit includes gate drivers U2, diode D2, electric capacity C8, resistance R5
And resistance R6；The VDD pin of described gate drivers U2 is connected to described power supply control chip U1
VCC pin, the GND pin ground connection of described gate drivers U2, described power supply control chip U1
VCC pin by described diode D2 be connected to described gate drivers U2 VB pin and
The one end of electric capacity C8, the other end of described electric capacity C8 be connected to the one end of described resistance R6 with
And the pin VS of gate drivers U2, the pin HO of described gate drivers U2 are by described resistance
R5 is connected to the other end and the grid of metal-oxide-semiconductor Q1 of described resistance R6, described gate drivers
The pin VS of U2 is connected to the source electrode of described metal-oxide-semiconductor Q1, the one end of inductance L1 and diode
The negative electrode of D1.
Described filter circuit includes electric capacity C2 and electric capacity C12；One end of described electric capacity C2 and described electricity
The other end of described resistance R1 it is connected to, another of described electric capacity C2 after holding one end parallel connection of C12
Hold in parallel with the other end of described electric capacity C12 after be connected to the other end and the phone of described resistance R2.
Control chip SLIC makes by controlling the first control switching circuit and the second control switching circuit
Change to the power supply of phone between-30V and-48V, meet user and use.Wherein power supply control
Coremaking sheet U1 drives metal-oxide-semiconductor Q1 to switch by isolated drive circuit；And by resistance R1 and electricity
Resistance R2 carries out dividing potential drop and obtains reference voltage, controls the voltage of output according to this reference voltage.
As it is shown in figure 1, this utility model uses the switching of GPIO control circuit, thus realize the most collinear
The demand of line feed mode.
When subscribers' line is shorter, by the interface of control chip SLIC, the GPIO pin in figure is put
For high level so that audion Q6, Q7 are both turned on, by the COMP pin of power supply control chip U1
Ground connection so that-30V turns-48V power supply and do not works.Meanwhile, audion Q5 turns on, metal-oxide-semiconductor Q4
Grid voltage is more than cut-in voltage so that metal-oxide-semiconductor Q4 turns on, the circuit input directly output of-30V
To-48V end.
When subscribers' line is longer, by the I/O port of control chip SLIC, the GPIO in figure is drawn
Foot is set to low level so that audion Q5 ends, and metal-oxide-semiconductor Q4 ends；Meanwhile, audion Q6,
Q7 ends, and-30V turns-48V power supply and normally works, and provides effective feed for long line circuit.
Although the foregoing describing detailed description of the invention of the present utility model, but it is familiar with the skill of the art
Art personnel should be appreciated that our described specific embodiment is merely exemplary rather than for right
The restriction of scope of the present utility model, those of ordinary skill in the art are according to spirit of the present utility model
The modification of the equivalence made and change, all should contain of the present utility model claimed
In the range of.
Claims (6)
1., for a switching circuit for subscribers' line long short-term feed, it is used for connecting control chip SLIC
And phone；Described switching circuit includes power supply control chip U1, it is characterised in that: also include that first cuts
Change control circuit, the second control switching circuit, chip power circuit, isolated drive circuit, filter circuit,
Electric capacity C1, electric capacity C5, electric capacity C10, electric capacity C11, electric capacity C3, electric capacity C7, electric capacity C9, electricity
Resistance R4, resistance R3, resistance R1, resistance R2, inductance L1 and metal-oxide-semiconductor Q1；
Described control chip SLIC is respectively connecting to described first control switching circuit, the second switching control
Circuit, one end of electric capacity C1, electric capacity C5 one end and inductance L1 one end；
Described phone is connected to described first control switching circuit and filter circuit；
Described second switching circuit is connected to the COMP pin of described power supply control chip U1, electric capacity C10
One end and the one end of resistance R4；
The VCC pin of described power supply control chip U1 connects described chip power circuit, resistance respectively
R3 one end, electric capacity C3 one end, electric capacity C7 one end, electric capacity C9 one end and isolation drive
Circuit；
Described isolated drive circuit be connected to the source electrode of described metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1,
The negative electrode of diode D1 and the other end of inductance L1；
The other end of described resistance R4, the other end of electric capacity C10 and power supply control chip U1
VFB pins in parallel after be connected to one end and the one end of resistance R2 of described resistance R1；
Described filter circuit is parallel to the other end and the other end of resistance R2 of described resistance R1；
The other end of described resistance R3 be connected to the RT/CT pin of described power supply control chip U1 with
And the one end of electric capacity C11；
The other end of described electric capacity C11, electric capacity C3 the other end, electric capacity C7 the other end, electricity
Hold C9 the other end, the anode of diode D1, the other end of resistance R2, power supply control chip
The GROUND negative electrode of U1, the second control switching circuit and the equal ground connection of isolated drive circuit；
The other end of described electric capacity C1, the other end of electric capacity C5, chip power circuit, MOS
The drain electrode of pipe Q1 and the equal ground connection in the other end of resistance R1.
A kind of switching circuit for subscribers' line long short-term feed, its
It is characterised by: described first control switching circuit includes audion Q5, resistance R21, resistance R11 bis-
Pole pipe D9 and metal-oxide-semiconductor Q4, described resistance R21 one end is connected to control chip SLIC, described
The other end of resistance R21 is connected to the colelctor electrode of audion Q5, and the base stage of described triode Q5 connects
Ground, the transmitter of described audion Q5 connects the grid of described metal-oxide-semiconductor Q4, diode D9 respectively
Negative electrode and the other end of resistance R11, described phone connect respectively described resistance R11 the other end,
The anode of diode D9 and the source electrode of metal-oxide-semiconductor Q4, the drain electrode of described metal-oxide-semiconductor Q4 is connected to
Control chip SLIC.
A kind of switching circuit for subscribers' line long short-term feed, its
It is characterised by: described second control switching circuit includes resistance R23, triode Q6, resistance R26, electricity
Resistance R25 and audion Q7；Described control chip SLIC is connected to the one end of described resistance R23,
The other end of described resistance R23 is connected to the colelctor electrode of described audion Q6, described audion Q6
Base earth, the emitter stage of described audion Q6 connects described three poles respectively by described resistance R26
The base stage of pipe Q7 and the one end of resistance R25, described resistance R25 and the transmitting of audion Q7
Extremely all ground connection, the colelctor electrode of described audion Q7 is respectively connecting to described power supply control chip U1's
COMP pin, the one end of electric capacity C10 and the one end of resistance R4.
A kind of switching circuit for subscribers' line long short-term feed, its
It is characterised by: described chip power circuit includes resistance R7, diode D3, electric capacity C20 and three poles
The one end of pipe Q2, described resistance R7 and the equal ground connection of colelctor electrode of audion Q2, described resistance R7
The other end connect negative electrode and the base stage of audion Q2 of described diode D3, described three poles respectively
The emitter stage of pipe Q2 connects the one end of described electric capacity C20 and power supply control chip U1's respectively
VCC pin, the other end of described electric capacity C20 connects anode and the ground connection of described diode D3.
A kind of switching circuit for subscribers' line long short-term feed, its
It is characterised by: described isolated drive circuit includes gate drivers U2, diode D2, electric capacity C8, electricity
Resistance R5 and resistance R6；The VDD pin of described gate drivers U2 is connected to described power supply and controls core
The VCC pin of sheet U1, the GND pin ground connection of described gate drivers U2, described power supply controls
The VCC pin of chip U1 is connected to the VB of described gate drivers U2 by described diode D2
Pin and the one end of electric capacity C8, the other end of described electric capacity C8 is connected to described resistance R6's
The pin VS of one end and gate drivers U2, the pin HO of described gate drivers U2 pass through
Described resistance R5 is connected to the other end and the grid of metal-oxide-semiconductor Q1 of described resistance R6, described
The pin VS of gate drivers U2 is connected to the source electrode of described metal-oxide-semiconductor Q1, one end of inductance L1
Portion and the negative electrode of diode D1.
A kind of switching circuit for subscribers' line long short-term feed, its
It is characterised by: described filter circuit includes electric capacity C2 and electric capacity C12；One end of described electric capacity C2 with
The other end of described resistance R1, described electric capacity C2 it is connected to after one end parallel connection of described electric capacity C12
The other end in parallel with the other end of described electric capacity C12 after be connected to the other end of described resistance R2 with
And phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620421348.2U CN205792854U (en) | 2016-05-11 | 2016-05-11 | A kind of switching circuit for subscribers' line long short-term feed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620421348.2U CN205792854U (en) | 2016-05-11 | 2016-05-11 | A kind of switching circuit for subscribers' line long short-term feed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205792854U true CN205792854U (en) | 2016-12-07 |
Family
ID=57408881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620421348.2U Active CN205792854U (en) | 2016-05-11 | 2016-05-11 | A kind of switching circuit for subscribers' line long short-term feed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205792854U (en) |
-
2016
- 2016-05-11 CN CN201620421348.2U patent/CN205792854U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
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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| CP01 | Change in the name or title of a patent holder |