CN109256936A - A kind of external VOIP power supply unit - Google Patents
A kind of external VOIP power supply unit Download PDFInfo
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- CN109256936A CN109256936A CN201811129330.5A CN201811129330A CN109256936A CN 109256936 A CN109256936 A CN 109256936A CN 201811129330 A CN201811129330 A CN 201811129330A CN 109256936 A CN109256936 A CN 109256936A
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- 238000004891 communication Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 118
- 238000001514 detection method Methods 0.000 claims description 45
- 238000005070 sampling Methods 0.000 claims description 39
- 239000003381 stabilizer Substances 0.000 claims description 31
- 230000005611 electricity Effects 0.000 claims description 17
- 239000000284 extract Substances 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 14
- 239000004065 semiconductor Substances 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 101150012579 ADSL gene Proteins 0.000 description 4
- 102100020775 Adenylosuccinate lyase Human genes 0.000 description 4
- 108700040193 Adenylosuccinate lyases Proteins 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of external VOIP power supply units, comprising: VOIP power supply circuit；VOIP power supply circuit includes switching tube, inductance, first diode, the second diode, third diode, first resistor group, second resistance group, the port VH, the port VL, power port and control port；First pole of switching tube is connect with control port, and the second pole of switching tube is connect with power port, and the third pole of switching tube is grounded by inductance；The cathode of first diode is connected between the third pole of switching tube and inductance, and the anode of first diode is connect by first resistor group with the port VL；The cathode of second diode is connected between the anode of first diode and first resistor group, and the anode of the second diode is connect with the cathode of third diode, and the anode of third diode is connect by second resistance group with the port VH.VOIP power supply unit provided by the invention can be effectively reduced the interference to adsl communication link.
Description
Technical field
The present invention relates to phone technical fields, more particularly to a kind of external VOIP power supply unit.
Background technique
The router or ADSL of the existing band networking telephone (Voice over Internet Protocol, VOIP) function
Modem, subscriber line interface circuit (SLIC, the Subscriber Line to phone power supply mainly by being built in communication equipment
Interface Circuit)) and DC-DC chip provide.And external power supply by built-in VOIP power supply module to
Slic circuit power supply, and built-in VOIP power supply module is to the purpose that slic circuit is powered: in order to logical to phone and VOIP
Believe that link provides the voltage under ring, call isotype.Wherein, after VOIP works together, built-in VOIP power supply module
The spike of multiple frequency points can be caused to interfere adsl communication link.
Summary of the invention
In view of the above-mentioned problems, at work can the purpose of the present invention is to provide a kind of external VOIP power supply unit
The interference to adsl communication link is enough effectively reduced.
To achieve the goals above, the embodiment of the invention provides a kind of external VOIP power supply units, for band
The slic circuit of the communication equipment of VOIP function is powered comprising: VOIP power supply circuit；
The VOIP power supply circuit includes switching tube, inductance, first diode, the first resistor containing an at least resistance
Group, the second resistance group containing an at least resistance, the port VH for exporting high negative voltage, the end VL for exporting low negative voltage
Mouth, the power port for being connect with external power supply and the control being connect for the pulse control signal output end with slic circuit
Port；
First pole of the switching tube is connect with the control port, the second pole of the switching tube and the power port
Connection, the third pole of the switching tube is grounded by the inductance；
The cathode of the first diode is connected between the third pole of the switching tube and the inductance；Described 1st
The anode of pole pipe is connect with the port VL by the first resistor group, and passes through the second resistance group and the end VH
Mouth connection；
Wherein, the slic circuit is for exporting pulse control signal to control the on and off of the switching tube；Institute
The resistance value for stating second resistance group is greater than the resistance value of the first resistor group.
As an improvement of the above scheme, the VOIP power supply circuit further includes current sampling circuit and voltage sampling circuit；
The test side of the current sampling circuit is connect with one end of the ground connection of the inductance, the current sampling circuit
Signal output end is connect with the current detecting end of the slic circuit；
The sampling end of the voltage sampling circuit is connect with the port VL, the output end of the voltage sampling circuit and institute
State the Voltage Feedback port connection that VOIP power supply circuit has；The Voltage Feedback port is for the voltage with the slic circuit
Test side connection；
Wherein, the slic circuit is also used to when the current sampling data for detecting the current sampling circuit be more than setting value
When, stop exporting pulse control signal to the VOIP power supply circuit；
The slic circuit is also used to control the pulse control according to the voltage detection signal fed back by Voltage Feedback port
The pulsewidth of signal processed.
As an improvement of the above scheme, the current sampling circuit includes first resistor, second resistance, 3rd resistor,
Four resistance, the first filter capacitor and the current sampling signal output end being connect for the current detecting end with the slic circuit
Mouthful；
The first resistor and the second resistance are parallel between the inductance and ground, and one end of the 3rd resistor connects
It is connected between the first resistor and the inductance, the other end of the 3rd resistor and the current sampling signal output port
Connection, one end of the 4th resistance is connected between the 3rd resistor and the current sampling signal output port, described
The other end of 4th resistance is grounded, the first capacitor and the 4th resistor coupled in parallel.
As an improvement of the above scheme, the VOIP power supply circuit further include:
Second filter capacitor, the 6th resistance, the second diode and third diode；
The cathode of second diode is connected to the positive between the first resistor group of the first diode, institute
The anode for stating the second diode is connect with the cathode of the third diode, and the anode of the third diode passes through described second
Resistance group is connect with the port VH；One end of second filter capacitor be connected to second diode anode with it is described
Between the cathode of third diode, the other end of second filter capacitor be connected to the switching tube third pole and the electricity
Between sense；6th resistance is connected between the cathode of second diode and the anode of the first diode；
Or further include:
First storage capacitor, the second storage capacitor, the first voltage-stabiliser tube, the second voltage-stabiliser tube, the second diode and the three or two pole
Pipe；
The cathode of second diode is connected to the positive between the first resistor group of the first diode, institute
The anode for stating the second diode is connect with the cathode of the third diode, and the anode of the third diode passes through described second
Resistance group is connect with the port VH；The cathode of first storage capacitor be connected to the third diode anode with it is described
Between second resistance group, the anode of first storage capacitor is connected to the positive and first resistor of the first diode
Between group；First voltage-stabiliser tube is in parallel with first storage capacitor；The cathode of second storage capacitor is connected to described
Positive between the first resistor group, the plus earth of second storage capacitor of first diode；Second pressure stabilizing
It manages in parallel with second storage capacitor；
Or further include:
Third filter capacitor, the 4th filter capacitor, the 5th filter capacitor, the 6th filter capacitor, the 7th filter capacitor, the 8th
Filter capacitor, the second diode and third diode；And the voltage sampling circuit includes the 7th resistance and the 8th resistance；
The cathode of second diode is connected to the positive between the first resistor group of the first diode, institute
The anode for stating the second diode is connect with the cathode of the third diode, and the anode of the third diode passes through described second
Resistance group is connect with the port VH；
One end of the third capacitor is connected to the positive between the second resistance group of the third diode, described
The other end of third capacitor passes sequentially through the 7th resistance and the 8th resistance, and is connected to the first diode just
Between pole and the first resistor group；One end of both 4th filter capacitor and the 5th filter capacitor is connected to described
Between second resistance group and the port VH, another termination of both the 4th filter capacitor and described 5th filter capacitor
Ground；
One end of 6th capacitor is connected to the positive between the first resistor group of the first diode, described
The other end of 6th capacitor is grounded；One end of both 7th filter capacitor and the 8th filter capacitor is connected to described
Between one resistance group and the port VL, the other end of both the 7th filter capacitor and described 8th filter capacitor is grounded.
As an improvement of the above scheme, the external VOIP power supply unit further include for detect phone whether with it is described
The phone that slic circuit is disconnected extracts detection circuit；
The phone extracts the test side of detection circuit for connecting with phone signal wire, and the phone extracts detection circuit
Detection signal feedback end for being connect with the excision test side of the slic circuit；
Wherein, the slic circuit is used to control whether to supply to phone according to the detection signal for extracing detection circuit
Electricity；
The phone signal wire is connected between the phone and the phone connecting interface of the slic circuit, including Ting
Signal wire and Ring signal wire.
As an improvement of the above scheme, it includes difference amplifier, rectifier, the first NPN that the phone, which extracts detection circuit,
Triode, p-type metal-oxide-semiconductor, first capacitor group, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor and phone detection
Port；
The non-inverting input terminal of the difference amplifier is connect with the Ting signal wire, and the reverse phase of the difference amplifier is defeated
Enter end to connect with the Ring signal wire, the output end of the difference amplifier passes through the rectifier and the first NPN tri-
The base stage of pole pipe connects；
The emitter of first NPN triode is grounded, and the collector of first NPN triode passes through the 9th electricity
Resistance is connect with phone detection port；
The grid of the p-type metal-oxide-semiconductor is connected between the 9th resistance and phone detection port, the p-type MOS
The source electrode of the grounded drain of pipe, the p-type metal-oxide-semiconductor is connect with phone detection port；
The power port passes sequentially through the tenth resistance and the eleventh resistor is grounded, the twelfth resistor
One end is connected between the tenth resistance and the eleventh resistor, and the other end of the twelfth resistor and the phone are examined
Survey port connection.
As an improvement of the above scheme, the external VOIP power supply unit further includes phone signal wire over-voltage protection electricity
Road；
The phone signal wire over-voltage protection circuit be used for by the phone signal wire be connected to the phone with it is described
Between the phone connecting interface of slic circuit, and the voltage mistake for preventing the phone connecting interface of the slic circuit from exporting
It is high.
As an improvement of the above scheme, the phone signal wire over-voltage protection circuit includes third voltage-stabiliser tube, the 4th pressure stabilizing
Pipe, transformer, the 15th resistance, the 16th resistance, the 17th resistance and first gas discharge tube；
The both ends of the primary coil of the transformer are connect by the phone signal wire with the phone of the slic circuit
The both ends of interface connection, the secondary winding of the transformer are connect by the phone signal wire with the phone；
One end of the third voltage-stabiliser tube is grounded, and the other end of the third voltage-stabiliser tube and one end of the primary coil connect
It connects；One end of 4th voltage-stabiliser tube is grounded, and the other end of the 4th voltage-stabiliser tube is connect with the other end of the primary coil；
The first gas discharge tube is in parallel with the secondary winding；
15th resistance is in parallel with the primary coil, and one end of the 16th resistance and the secondary winding is gone here and there
Connection, the 17th resistance are connected with the other end of the secondary winding.
As an improvement of the above scheme, the external VOIP power supply unit further includes power supply over-voltage protection circuit；
The power supply over-voltage protection circuit is connected between the external power supply and the power port, and defeated for preventing
The supply voltage entered to the power port is excessively high.
As an improvement of the above scheme, the power supply over-voltage protection circuit includes that second gas discharge tube, third gas are put
Fulgurite, at least a varistor and fuse；
The anode of the external power supply passes sequentially through the fuse and an at least varistor and the external electricity
The cathode in source connects；The power port is connect with the anode of the external power supply；
One end of the second gas discharge tube is grounded, the other end and the external power supply of the second gas discharge tube
Anode connection；
One end of the third gas discharge tube is grounded, the other end and the external power supply of the third gas discharge tube
Cathode connection.
The external VOIP power supply unit provided in an embodiment of the present invention, it is described when needing to be powered work
Slic circuit exports pulse control signal to the VOIP power supply circuit, controls the switching tube conducting, at this time the power end
Mouth gives the induction charging, the inductance stored magnetic energy, and the first diode is in not on-state；When the slic circuit
When controlling switching tube closing, since the electric current in inductance cannot be mutated, inductance can be generated and original current direction
Consistent voltage leads to voltage reversal, and the first diode is in the conductive state at this time, and the inductance can discharge the magnetic of storage
It can power and flow to rear class, when electric current flows through the first resistor group (resistance of the resistance value of first resistor group than second resistance group
Be worth small) after will form a low negative voltage and from the port VL export, will form after electric current flows through the second resistance group
One high negative voltage is simultaneously exported from the port VH, to power to the slic circuit.As described in the embodiment of the present invention
VOIP power supply unit is placed outside outside router or ADSL modem equipment, far from the adsl communication chain in these equipment
Road, therefore can be effectively reduced the interference to adsl communication link.Simultaneously by the way that the switching tube and diode these points are arranged
Vertical device is not only able to realize the output of two kinds of negative high voltages, at the same slic circuit and external power supply can also be carried out effectively every
From.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in embodiment will be made below
Simply introduce, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit module schematic diagram of the external VOIP power supply unit of one kind provided in an embodiment of the present invention；
Fig. 2 is the circuit structure diagram of VOIP power supply circuit shown in fig. 1；
Fig. 3 is the circuit structure diagram that phone shown in fig. 1 extracts detection circuit；
Fig. 4 is the circuit structure diagram of phone signal wire over-voltage protection circuit shown in fig. 1；
Fig. 5 is the circuit structure diagram of power supply over-voltage protection circuit shown in fig. 1.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Figure 1, the embodiment of the invention provides a kind of external VOIP power supply units, for VOIP function
The slic circuit 2 (i.e. subscriber line interface circuit) of communication equipment is powered comprising: VOIP power supply circuit 1；Fig. 2 is referred to, it is described
VOIP power supply circuit 1 includes switching tube Q1, inductance L, first diode D1, the second diode D2, third diode D3, the first electricity
Resistance group 10, the port the VH VH for exporting high negative voltage, the port the VL VL for exporting low negative voltage, is used second resistance group 11
In the power port Vin being connect with external power supply and the control being connect for the pulse control signal output end P1 with slic circuit 2
Port SW processed；The first pole of the switching tube Q1 is connect with the control port SW, the second pole of the switching tube Q1 with it is described
The third pole of power port Vin connection, the switching tube Q1 is grounded by the inductance L；The cathode of the first diode D1
It is connected between the third pole of the switching tube Q1 and the inductance L；The anode of the first diode D1, passes through described first
Resistance group 10 is connect with the port VL, and is connect by the second resistance group 11 with the port VH；Wherein, the SLIC
Circuit 2 is for exporting pulse control signal to control the on and off of the switching tube Q1；The electricity of the second resistance group 11
Resistance value is greater than the resistance value of the first resistor group 10.
The working principle of the VOIP power supply circuit 1 are as follows: when needing to be powered work, the slic circuit 2 is to institute
It states VOIP power supply circuit 1 and exports pulse control signal, control the switching tube Q1 conducting, the power port Vin is to institute at this time
Inductance L charging is stated, the inductance L stored magnetic energy, the first diode D1 is in not on-state；When the slic circuit 2
When controlling switching tube Q1 closing, since the electric current in inductance L cannot be mutated, inductance L can be generated and original electric current
The consistent voltage in direction, leads to voltage reversal, and the first diode D1 is in the conductive state at this time, and the first diode
D1 can play the role of boosting, and the magnetic energy that the inductance L can discharge storage is powered to rear class to flow, when electric current flows through described first
It will form a low negative voltage simultaneously after resistance group 10 (resistance value of first resistor group 10 is smaller than the resistance value of second resistance group 11)
It is exported from the port the VL VL, will form a high negative voltage after electric current flows through the second resistance group 11 and from the end VH
Mouth VH output, to power to the slic circuit 2.
It is understood that the first resistor group 10 and the second resistance group 11 may each comprise one or one with
On resistance.For example, the first resistor group 10 includes the 21st resistance 21, the second resistance group 11 includes the 22nd
Resistance 22.
It should be noted that the VOIP power supply unit is to the purpose that slic circuit 2 is powered: in order to phone 6 and
VOIP communication link provides the voltage under ring, call isotype.Specifically, the high negative voltage of the port the VH VH output is main
For ring, the low negative voltage of the port the VL VL output is mainly used for conversing.
In addition, it is worth noting that, by adjusting the pulsewidth of the pulse control signal of output, the adjustable port VH
The size of the voltage of the VH and port VL VL output.
In embodiments of the present invention, it is preferable that the VOIP power supply circuit 1 further includes the second diode D2 and the three or two pole
Pipe D3；The cathode of the second diode D2 be connected to the first diode D1 anode with the first resistor group 10 it
Between, the anode of the second diode D2 is connect with the cathode of the third diode D3, the anode of the third diode D3
It is connect by the second resistance group 11 with the port the VH VH.Wherein, the second diode D2 and third diode D3 are being connected
When play the role of boosting so that the port the VH VH exports reasonable high negative pressure.
In embodiments of the present invention, the switching tube Q1 is PNP triode, and certainly, the switching tube Q1 can also be NPN
Triode or metal-oxide-semiconductor etc..It is not specifically limited herein.
In embodiments of the present invention, it is preferable that refer to Fig. 2, the VOIP power supply circuit 1 further includes voltage sampling circuit
13；The sampling end of the voltage sampling circuit 13 is connect with the port the VL VL, the output end of the voltage sampling circuit 13 with
The Voltage Feedback port VFB connection that the VOIP power supply circuit 1 has；Voltage Feedback port VFB is used for and the slic circuit 2
Voltage detection terminal P2 connection；Wherein, the slic circuit 2 is also used to be examined according to the voltage by Voltage Feedback port VFB feedback
Survey the pulsewidth that signal controls the pulse control signal.
Specifically, when the voltage detection signal that the slic circuit 2 (specially SLIC chip) comes feedback passes through A/D
It is converted into digital signal, the voltage detecting value after conversion is compared with the preset value of the register of SLIC chip interior,
And the pulsewidth of the pulse control signal according to comparison result adjustment output, to achieve the purpose that adjust output voltage.For example, working as
, can be wider by the pulsewidth tune of the pulse control signal of output when detecting the brownout of the port the VL VL, so as to
So that the voltage of the port the VL VL output is got higher.
In foregoing invention embodiment, it is preferable that refer to Fig. 2, the VOIP power supply circuit 1 further include: third filtering
Capacitor C3, the 4th filter capacitor C4, the 5th filter capacitor C5, the 6th filter capacitor C6, the filtering of the 7th filter capacitor C7 and the 8th
Capacitor C8；And illustratively, the voltage sampling circuit 13 includes the 7th resistance R7 and the 8th resistance R8；
One end of the third capacitor is connected to the positive between the second resistance group 11 of the third diode D3,
The other end of the third capacitor passes sequentially through the 7th resistance R7 and the 8th resistance R8, and is connected to the described 1st
Pole pipe D1's is positive between the first resistor group 10；Both the 4th filter capacitor C4 and the 5th filter capacitor C5
One end be connected between the second resistance group 11 and the port the VH VH, the 4th filter capacitor C4 and it is described 5th filter
The other end of both wave capacitor C5 is grounded；
One end of 6th capacitor is connected to the positive between the first resistor group 10 of the first diode D1,
The other end of 6th capacitor is grounded；The 7th filter capacitor C7 is connect with one end of both the 8th filter capacitor C8
Between the first resistor group 10 and the port the VL VL, the 7th filter capacitor C7 and the 8th filter capacitor C8 two
The other end of person is grounded.
In embodiments of the present invention, three filter capacitor, the 4th filter capacitor C4, the 5th filter capacitor C5, the 6th filter
Wave capacitor C6, the 7th filter capacitor C7 and the 8th filter capacitor C8 this six capacitors are used to filter, and three filter capacitor,
4th filter capacitor C4, the capacitance of the 5th filter capacitor C5 these three capacitors are different, can filter out different frequency range in this way
Clutter；Similarly, the capacitance of the 6th filter capacitor C6, the 7th filter capacitor C7 and the 8th filter capacitor C8 these three capacitors
Also different, the clutter of different frequency range can be filtered out in this way.
In foregoing invention embodiment, it is preferable that refer to Fig. 2, the VOIP power supply circuit 1 further includes current sample electricity
Road 12；The test side of the current sampling circuit 12 is connect with one end of the ground connection of the inductance L, the current sampling circuit 12
Signal output end connect with the current detecting end P3 of the slic circuit 2；Wherein, the slic circuit 2 is also used to when detection
To the current sampling circuit 12 current sampling data be more than setting value when, stop to the VOIP power supply circuit 1 export pulse
Signal is controlled, so as to play the role of overcurrent protection.
Illustratively, Fig. 2 is referred to, the current sampling circuit 12 includes first resistor R1, second resistance R2, third electricity
It hinders R3, the 4th resistance R4, the first filter capacitor C1 and is adopted for the electric current connecting of the current detecting end P3 with the slic circuit 2
Sample signal output port IS；The first resistor R1 and the second resistance R2 are parallel between the inductance L and ground, and described
One end of three resistance R3 is connected between the first resistor R1 and the inductance L, the other end of the 3rd resistor R3 and institute
The IS connection of current sampling signal output port is stated, one end of the 4th resistance R4 is connected to the 3rd resistor R3 and the electricity
It flows between sampled signal output port IS, the other end of the 4th resistance R4 is grounded, the first capacitor and the 4th electricity
It is in parallel to hinder R4.
Wherein, this four resistance of the first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 are mainly
Realize current sample function, and the first filter capacitor C1 is then mainly used for filtering.
In foregoing invention embodiment, it is preferable that refer to Fig. 2, the VOIP power supply circuit 1 further include: the second filtering
Capacitor C2 and the 6th resistance R6；One end of the second filter capacitor C2 be connected to the second diode D2 anode with it is described
Between the cathode of third diode D3, the other end of the second filter capacitor C2 be connected to the third pole of the switching tube Q1 with
Between the inductance L；The 6th resistance R6 is connected to the cathode of the second diode D2 with the first diode D1's
Between anode.
Wherein, the second filter capacitor C2 constitutes an absorbing circuit, the electricity mainly generated in absorption switching process
Pointing peak, plays the role of protection.
In foregoing invention embodiment, it is preferable that refer to Fig. 2, the VOIP power supply circuit 1 further include: the first energy storage
Capacitor C11, the second storage capacitor C12, the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2；The cathode of the first storage capacitor C11
It is connected to the positive between the second resistance group 11 of the third diode D3, the anode of the first storage capacitor C11
It is connected to the positive between the first resistor group 10 of the first diode D1；The first voltage-stabiliser tube Z1 and described first
Storage capacitor C11 is in parallel；The cathode of the second storage capacitor C12 is connected to the anode and described the of the first diode D1
Between one resistance group 10, the plus earth of the second storage capacitor C12；The second voltage-stabiliser tube Z2 and second energy storage electricity
It is in parallel to hold C12.
Wherein, the first storage capacitor C11 plays the role of boosting, for the electricity of the port the VH VH output to be turned up
Pressure, the second storage capacitor C12 play the role of boosting, for the voltage of the port the VL VL output to be turned up.In addition, in order to
It avoids the instant reverse that polarity of voltage occurs in switching process and two storage capacitors is caused polarity of voltage overturning occur and burst,
Can in the both ends the first storage capacitor C11 the first voltage-stabiliser tube Z1 in parallel, the both ends the second storage capacitor C12 simultaneously
Join the second voltage-stabiliser tube Z2.
In foregoing invention embodiment, it is preferable that referring to Figure 1, the external VOIP power supply unit further includes being used for
The phone excision detection circuit 3 whether detection phone is disconnected with the slic circuit 2；The phone extracts detection circuit 3
Test side for connect with phone signal wire, the phone extract the detection signal feedback end of detection circuit 3 for it is described
The excision test side P4 connection of slic circuit 2；Wherein, the slic circuit 2 is used for according to the detection for extracing detection circuit
Signal controls whether to power to phone；The phone signal wire is connected to the phone and connect with the phone of the slic circuit 2
Between interface P5, including Ting signal wire and Ring signal wire.
Specifically, after the phone, which extracts detection circuit 3, detects that phone 6 and the slic circuit 2 are disconnected, this
Shi Suoshu slic circuit 2 extracts the detection signal that detection circuit 3 is fed back according to the phone, stops supplying to the phone 6
Electricity, so as to reach energy-efficient effect.
Illustratively, Fig. 3 is referred to, it includes difference amplifier U, rectifier BD, first that the phone, which extracts detection circuit 3,
NPN triode Q3, p-type metal-oxide-semiconductor Q4, first capacitor group 30, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the tenth
Two resistance R12 and phone detect port GPIO；
The non-inverting input terminal of the difference amplifier U is connect with the Ting signal wire, the reverse phase of the difference amplifier U
Input terminal is connect with the Ring signal wire, and the output end of the difference amplifier U passes through the rectifier BD and described first
The base stage of NPN triode Q3 connects；
The emitter of the first NPN triode Q3 is grounded, and the collector of the first NPN triode Q3 passes through described the
Nine resistance R9 are connect with phone detection port GPIO；The phone detection port GPIO is used for and the slic circuit 2
Extract test side P4 connection；
The grid of the p-type metal-oxide-semiconductor Q4 is connected between the 9th resistance R9 and phone detection port GPIO, institute
The grounded drain of p-type metal-oxide-semiconductor Q4 is stated, the source electrode of the p-type metal-oxide-semiconductor Q4 is connect with phone detection port GPIO；
The power port Vin passes sequentially through the tenth resistance R10 and the eleventh resistor R11 and is grounded, and described the
One end of 12 resistance R12 is connected between the tenth resistance R10 and the eleventh resistor R11, the twelfth resistor
The other end of R12 is connect with phone detection port GPIO.
Wherein, the phone extracts the working principle of detection circuit 3 are as follows: the Ting signal wire with the Ring signal
The signal of line is converted into sinusoidal signal after the differential amplification of the difference amplifier U, then passes through the rectifier BD's
After rectification and the effect of the first capacitor group 30, become direct current signal, which can control tri- pole the first NPN
The conducting of pipe Q3, so that the p-type metal-oxide-semiconductor Q4 conducting is controlled, and the slic circuit 2 (specially SLIC chip) passes through detection
The height of the voltage of the phone detection port GPIO, to judge whether phone is extractd.After detecting excision, the SLIC
Circuit 2 just stops powering to phone.
In foregoing invention embodiment, it is preferable that referring to Figure 1, the external VOIP power supply unit further includes phone
Signal wire over-voltage protection circuit 4；The phone signal wire over-voltage protection circuit 4 is used to be connected to institute by the phone signal wire
It states between phone 6 and the phone connecting interface P5 of the slic circuit 2, and for preventing the phone of the slic circuit 2 from connecting
The overtension of interface P5 output.
Illustratively, Fig. 4 is referred to, the phone signal wire over-voltage protection circuit 4 includes third voltage-stabiliser tube Z3, the 4th steady
Pressure pipe Z4, transformer T, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17 and first gas discharge tube S1；Institute
The both ends for stating the primary coil of transformer T are connected by the phone connecting interface P5 of the phone signal wire and the slic circuit 2
It connects, the both ends of the secondary winding of the transformer T are connect by the phone signal wire with the phone；The third voltage-stabiliser tube
One end of Z3 is grounded, and the other end of the third voltage-stabiliser tube Z3 is connect with one end of the primary coil；4th voltage-stabiliser tube
One end of Z4 is grounded, and the other end of the 4th voltage-stabiliser tube Z4 is connect with the other end of the primary coil；The first gas
Discharge tube S1 is in parallel with the secondary winding；The 15th resistance R15 is in parallel with the primary coil, the 16th resistance
R16 connects with one end of the secondary winding, and the 17th resistance R17 connects with the other end of the secondary winding.
Wherein, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17 three mainly play matching
The effect of impedance, third voltage-stabiliser tube Z3 and the 4th voltage-stabiliser tube Z4 are the anti-overvoltage devices of rear class, and first gas discharge tube S1 is prime
Anti- common mode over-voltage, transformer T is primarily to common-mode isolation.
In foregoing invention embodiment, it is preferable that referring to Figure 1, the external VOIP power supply unit further includes power supply
Over-voltage protection circuit 5；The power supply over-voltage protection circuit 5 is connected between the external power supply and the power port Vin, and
For preventing the supply voltage for being input to the power port Vin excessively high.
Illustratively, Fig. 5 is referred to, the power supply over-voltage protection circuit 5 includes second gas discharge tube S2, third gas
Discharge tube S3, at least a varistor RVz and fuse F1；The anode of the external power supply pass sequentially through the fuse F1 and
An at least varistor RVz is connect with the cathode of the external power supply；The power port Vin and the external power supply
Anode connection；One end of the second gas discharge tube S2 is grounded, the other end of the second gas discharge tube S2 and described outer
Connect the anode connection of power supply；One end of the third gas discharge tube S3 is grounded, the other end of the third gas discharge tube S3
It is connect with the cathode of the external power supply.
Wherein, the power supply over-voltage protection circuit 5 mainly passes through second gas discharge tube S2 and third gas discharge tube
S3 carries out the protection of common mode, and the protection of differential mode is carried out using varistor RVz.
In conclusion in embodiments of the present invention, since the VOIP power supply unit of the embodiment of the present invention is to be placed outside
Outside router or ADSL modem equipment, far from the adsl communication link in these equipment, therefore it can reduce to ADSL
The interference of communication link.Simultaneously by the way that the switching tube Q1 and diode these discrete devices are arranged, it is not only able to realize two kinds
The output of negative high voltage, while slic circuit 2 can also be effectively isolated with external power supply.
Above disclosed is only some preferred embodiments of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and weighs according to the present invention
Benefit requires made equivalent variations, still belongs to the scope covered by the invention.
Claims (10)
1. a kind of external VOIP power supply unit is powered for the slic circuit to the communication equipment with VOIP function, feature
It is, comprising: VOIP power supply circuit；
The VOIP power supply circuit includes switching tube, inductance, first diode, the first resistor group containing an at least resistance, contains
There is the second resistance group of an at least resistance, the port VH for exporting high negative voltage, the port VL for exporting low negative voltage, use
In the power port being connect with external power supply and the control port being connect for the pulse control signal output end with slic circuit；
First pole of the switching tube is connect with the control port, and the second pole of the switching tube and the power port connect
It connects, the third pole of the switching tube is grounded by the inductance；
The cathode of the first diode is connected between the third pole of the switching tube and the inductance；The first diode
Anode, connect by the first resistor group with the port VL, and pass through the second resistance group and the port VH and connect
It connects；
Wherein, the slic circuit is for exporting pulse control signal to control the on and off of the switching tube；Described
The resistance value of two resistance groups is greater than the resistance value of the first resistor group.
2. external VOIP power supply unit according to claim 1, which is characterized in that the VOIP power supply circuit further includes
Current sampling circuit and voltage sampling circuit；
The test side of the current sampling circuit is connect with one end of the ground connection of the inductance, the signal of the current sampling circuit
Output end is connect with the current detecting end of the slic circuit；
The sampling end of the voltage sampling circuit is connect with the port VL, the output end of the voltage sampling circuit with it is described
The Voltage Feedback port connection that VOIP power supply circuit has；The Voltage Feedback port is used to examine with the voltage of the slic circuit
Survey end connection；
Wherein, the slic circuit is also used to when the current sampling data for detecting the current sampling circuit is more than setting value,
Stop exporting pulse control signal to the VOIP power supply circuit；
The slic circuit, which is also used to control the pulse control according to the voltage detection signal fed back by Voltage Feedback port, to be believed
Number pulsewidth.
3. external VOIP power supply unit according to claim 2, which is characterized in that the current sampling circuit includes the
One resistance, second resistance, 3rd resistor, the 4th resistance, the first filter capacitor and for the current detecting with the slic circuit
Hold the current sampling signal output port of connection；
The first resistor and the second resistance are parallel between the inductance and ground, and one end of the 3rd resistor is connected to
Between the first resistor and the inductance, the other end of the 3rd resistor and the current sampling signal output port connect
It connecing, one end of the 4th resistance is connected between the 3rd resistor and the current sampling signal output port, and described
The other end of four resistance is grounded, the first capacitor and the 4th resistor coupled in parallel.
4. external VOIP power supply unit according to claim 2, which is characterized in that the VOIP power supply circuit also wraps
It includes:
Second filter capacitor, the 6th resistance, the second diode and third diode；
The cathode of second diode is connected to the positive between the first resistor group of the first diode, and described
The anode of two diodes is connect with the cathode of the third diode, and the anode of the third diode passes through the second resistance
Group is connect with the port VH；One end of second filter capacitor is connected to the positive and third of second diode
Between the cathode of diode, the other end of second filter capacitor be connected to the switching tube third pole and the inductance it
Between；6th resistance is connected between the cathode of second diode and the anode of the first diode；
Or further include:
First storage capacitor, the second storage capacitor, the first voltage-stabiliser tube, the second voltage-stabiliser tube, the second diode and third diode；
The cathode of second diode is connected to the positive between the first resistor group of the first diode, and described
The anode of two diodes is connect with the cathode of the third diode, and the anode of the third diode passes through the second resistance
Group is connect with the port VH；The cathode of first storage capacitor is connected to the anode and described second of the third diode
Between resistance group, the anode of first storage capacitor be connected to the first diode anode with the first resistor group it
Between；First voltage-stabiliser tube is in parallel with first storage capacitor；The cathode of second storage capacitor is connected to described first
Positive between the first resistor group, the plus earth of second storage capacitor of diode；Second voltage-stabiliser tube with
Second storage capacitor is in parallel；
Or further include:
Third filter capacitor, the 4th filter capacitor, the 5th filter capacitor, the 6th filter capacitor, the 7th filter capacitor, the 8th filtering
Capacitor, the second diode and third diode；And the voltage sampling circuit includes the 7th resistance and the 8th resistance；
The cathode of second diode is connected to the positive between the first resistor group of the first diode, and described
The anode of two diodes is connect with the cathode of the third diode, and the anode of the third diode passes through the second resistance
Group is connect with the port VH；
One end of the third capacitor is connected to the positive between the second resistance group of the third diode, the third
The other end of capacitor passes sequentially through the 7th resistance and the 8th resistance, and be connected to the first diode anode with
Between the first resistor group；One end of both 4th filter capacitor and the 5th filter capacitor is connected to described second
Between resistance group and the port VH, the other end of both the 4th filter capacitor and described 5th filter capacitor is grounded；
One end of 6th capacitor is connected to the positive between the first resistor group of the first diode, and the described 6th
The other end of capacitor is grounded；One end of both 7th filter capacitor and the 8th filter capacitor is connected to first electricity
Between resistance group and the port VL, the other end of both the 7th filter capacitor and described 8th filter capacitor is grounded.
5. external VOIP power supply unit according to claim 1, which is characterized in that further include for whether detecting phone
Detection circuit is extractd with the phone that the slic circuit is disconnected；
The phone extracts the test side of detection circuit for connecting with phone signal wire, and the phone extracts the inspection of detection circuit
Signal feedback end is surveyed for connecting with the excision test side of the slic circuit；
Wherein, the slic circuit is used to control whether to power to phone according to the detection signal for extracing detection circuit；
The phone signal wire is connected between the phone and the phone connecting interface of the slic circuit, including Ting signal
Line and Ring signal wire.
6. external VOIP power supply unit according to claim 5, which is characterized in that the phone extracts detection circuit packet
Include difference amplifier, rectifier, the first NPN triode, p-type metal-oxide-semiconductor, first capacitor group, the 9th resistance, the tenth resistance, the tenth
Machine testing port if one resistance, twelfth resistor and the excision test side for the slic circuit are connect；
The non-inverting input terminal of the difference amplifier is connect with the Ting signal wire, the inverting input terminal of the difference amplifier
It is connect with the Ring signal wire, the output end of the difference amplifier passes through the rectifier and first NPN triode
Base stage connection；
The emitter of first NPN triode is grounded, the collector of first NPN triode by the 9th resistance with
Phone detection port connection；
The grid of the p-type metal-oxide-semiconductor is connected between the 9th resistance and phone detection port, the p-type metal-oxide-semiconductor
The source electrode of grounded drain, the p-type metal-oxide-semiconductor is connect with phone detection port；
The power port passes sequentially through the tenth resistance and the eleventh resistor is grounded, one end of the twelfth resistor
It is connected between the tenth resistance and the eleventh resistor, the other end of the twelfth resistor and the phone test side
Mouth connection.
7. external VOIP power supply unit according to claim 5, which is characterized in that further include that phone signal wire over-voltage is anti-
Protection circuit；
The phone signal wire over-voltage protection circuit is used to be connected to the phone and the SLIC by the phone signal wire
Between the phone connecting interface of circuit, and the overtension for preventing the phone connecting interface of the slic circuit from exporting.
8. external VOIP power supply unit according to claim 7, which is characterized in that the phone signal wire over-voltage protection
Circuit includes third voltage-stabiliser tube, the 4th voltage-stabiliser tube, transformer, the 15th resistance, the 16th resistance, the 17th resistance and the first gas
Body discharge tube；
The phone connecting interface that the both ends of the primary coil of the transformer pass through the phone signal wire and the slic circuit
The both ends of connection, the secondary winding of the transformer are connect by the phone signal wire with the phone；
One end of the third voltage-stabiliser tube is grounded, and the other end of the third voltage-stabiliser tube is connect with one end of the primary coil；
One end of 4th voltage-stabiliser tube is grounded, and the other end of the 4th voltage-stabiliser tube is connect with the other end of the primary coil；
The first gas discharge tube is in parallel with the secondary winding；
15th resistance is in parallel with the primary coil, and the 16th resistance is connected with one end of the secondary winding,
17th resistance is connected with the other end of the secondary winding.
9. external VOIP power supply unit according to claim 1, which is characterized in that further include power supply over-voltage protection electricity
Road；
The power supply over-voltage protection circuit is connected between the external power supply and the power port, and for preventing from being input to
The supply voltage of the power port is excessively high.
10. external VOIP power supply unit according to claim 9, which is characterized in that the power supply over-voltage protection circuit
Including second gas discharge tube, third gas discharge tube, at least a varistor and fuse；
The anode of the external power supply passes sequentially through the fuse and an at least varistor and the external power supply
Cathode connection；The power port is connect with the anode of the external power supply；
One end of the second gas discharge tube is grounded, and the other end and the external power supply of the second gas discharge tube are just
Pole connection；
One end of the third gas discharge tube is grounded, the other end of the third gas discharge tube and bearing for the external power supply
Pole connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811129330.5A CN109256936B (en) | 2018-09-26 | 2018-09-26 | External VOIP power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811129330.5A CN109256936B (en) | 2018-09-26 | 2018-09-26 | External VOIP power supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109256936A true CN109256936A (en) | 2019-01-22 |
| CN109256936B CN109256936B (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811129330.5A Active CN109256936B (en) | 2018-09-26 | 2018-09-26 | External VOIP power supply device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110446120A (en) * | 2019-08-06 | 2019-11-12 | 深圳震有科技股份有限公司 | The guard method of FXS port line and device, computer equipment, medium |
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| US20070189495A1 (en) * | 2005-08-19 | 2007-08-16 | Crawley Philip J | Over-voltage protection circuit |
| CN2907112Y (en) * | 2006-05-23 | 2007-05-30 | 徐国才 | User interface circuit device |
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| CN109256936B (en) | 2020-05-22 |
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Address after: 5 / F, fulizhen building, No.1, Kefa Road, high tech park, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Lianzhou International Technology Co.,Ltd. Address before: 5 / F, fulizhen building, No.1, Kefa Road, high tech park, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN PUWEI TECHNOLOGY Co.,Ltd. |