CN200941164Y - Wet current realizer - Google Patents
Wet current realizer Download PDFInfo
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- CN200941164Y CN200941164Y CN 200620122938 CN200620122938U CN200941164Y CN 200941164 Y CN200941164 Y CN 200941164Y CN 200620122938 CN200620122938 CN 200620122938 CN 200620122938 U CN200620122938 U CN 200620122938U CN 200941164 Y CN200941164 Y CN 200941164Y
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Abstract
The utility model discloses a realization device of wet current which produces the wet current by replacing a controllable constant-voltage source with a controllable constant-current source. Being used as a power source, the controllable constant-current source produces the stable current. Using the constant-current source to produce the current, the utility model can secure the wet current of DSL line stable and meet the requirements of the European and American standards. Besides, the utility model alone provides a constant-current source for each DSL line to avoid the parallel connection of several pairs of DSL lines, which avoids the coupled noise between the loop lines, reduces the influence of the wet current circuit to the transportation performance of the DSL loop circuit and improves the stability of DSL service.
Description
Technical field
The utility model relates to the technology of DSL circuit, particularly wet current implement device in the DSL circuit.
Background technology
Since the xDSL technology is come out, because it utilizes existing copper cash resource that the business of high bandwidth is provided, can protect the investment of operator effectively, for the client provides broadband services, therefore obtain flourish in all parts of the world.Because its high bandwidth, rate-compatible, can adjust characteristics such as upstream and downstream bandwidth ratio flexibly, can satisfy the different demands of different groups, all obtained all over the world using widely.
According to statistics, Virtual network operator the expense on the twisted pairs of copper wire of laying account for its gross investment near half, it is that operator creates more profit that the xDSL business can effectively utilize existing copper cash resource, therefore pays much attention to the development of xDSL business.But because the environment more complicated that twisted pairs of copper wire is laid for example is in humid environment and air pollution serious area, copper cash is easy to take place oxidation, causes its electric transmission performance to descend, even can't transmit the xDSL business, and benefits of operators is badly damaged.
A kind of simple solution adds electric current exactly on subscribers feeder, copper cash can be avoided oxidation under "on" position, thereby and by the water vapor on the removal surface that generates heat and the electric transmission performance that dusty gas has effectively been protected copper twisted pairs.This electric current is called as wet current (Wetting Current), and current value does not need very big (about 3～20mA), and the dutycycle of conduction time also need not too high.
At present, the wet current implement device and with the annexation of external unit usually as shown in Figure 1.The implement device 110 of wet current is made of controlled constant pressure source module 111, protection and filtration module 112 and 113.In actual applications, this device is integrated in the DSL local side unit (xTU-C) 120, is sake of clarity, all this device is independently represented in the utility model.Wherein, controlled constant pressure source module 111 produces wet current as power supply, and goes into the DSL outside line by protection and filtration module 112 and 113 bridge joints respectively, inserts xTU-R130 and 140 at last, for they provide wet current; Simultaneously, the switch of controlled constant pressure source module 111 can be controlled by the I/O pin of central processing unit among the xTU-C120 (CPU), by at the I/O of CPU pin output high-low level, control in the controlled constant pressure source module whether produce wet current, thereby reach the open/close purpose of control wet current.Wet current implement device 110 just can provide wet current for the DSL circuit under xTU-C120 control like this.In addition, controlled constant pressure source module can also be controlled by toggle switch, no longer links to each other between the I/O pin of CPU among at this moment controlled constant pressure source and the xTU-C.Wherein, the circuit of controlled constant pressure source constitutes as shown in Figure 2, and the circuit of protection and filtration module constitutes as shown in Figure 3.
As shown in Figure 2, this is a constant voltage power supply circuit, when input end SEAL_ON is high level, optocoupler triode U2 conducting produces electric current in the circuit, simultaneously because after the operational amplifier U1 energising, form feedback circuit, make output terminal-VN RTN and-output voltage at VIN two ends keeps constant.When SEAL_ON was low level, optocoupler triode U2 ended, and does not have electric current in the circuit, output terminal-VNRTN and-the VIN both end voltage is 0.
In the circuit theory diagrams of protection shown in Figure 3 and filtration module, the shared wet current voltage of filtering circuit by separately of two DSL circuit TIP0/RING0 and TIP1/RING1 (VINTRN ,-VIN), form relation in parallel.The structure of two-way filtering and protection circuit is identical, one the tunnel being example wherein, and inductance L 0, L1, L2 and magnetic core T4 constitute transformer, this forms low-pass filter circuits to differential mode inductance with capacitor C 8 thereby make L1 and L2.Current-limiting resistance RT1 and RT2 play metering function, and voltage dependent resistor (VDR) RV1 and RV2 carry out overvoltage protection, and protective tube F1 and F2 carry out overcurrent protection.As seen from Figure 3, the wet current that constant pressure source produces passes through-VIN TRN, and-VIN is added in filtering and the protection circuit, inserts TIP0/RING0 behind filtering and over-voltage over-current protection, i.e. the DSL circuit.
In actual applications, there is following shortcoming in this wet current implement device:
1. because the length of DSL circuit is uncertain; line impedance uncertain (meeting is between 100 Ω～1K Ω usually); terminal (xTU-R) difference of user's use simultaneously; terminal impedance is also uncertain (may to be 1K Ω; 2K Ω; 10K Ω even bigger), so the wet current size differences on the different DSL circuit can be bigger, instability., all not too consistent to the demand of wet current in the various international standards with different telecom operators to the regulation of wet current.For example ITU-T G.991.2 among (ex G.shdsl) AnnexA.5.3.3 (North America) regulation to the wet current size be 1～20mA; ITU-T G.991.2 (ex G.shdsl) Annex B.5.3.2 in (Europe) regulation to wet current be less than 10mA; And Britain Telecom requires wet current to be greater than 3mA.Because the dc impedance of DSL line impedance and terminal xTU-R is uncertain, therefore existing constant pressure source scheme is difficult to satisfy simultaneously various standards and different operators' requirement.Simultaneously, the wet current size is unstable, can have influence on professional stability.
2. in multichannel DSL access device (DSLAM), because the restriction of cost and PCB area, for the wet current of one road DSL circuit provides an independent constant pressure source unrealistic, all be that a constant pressure source provides wet current (two-way DSL circuit as shown in Figure 3 has a constant pressure source) for several to the DSL circuit simultaneously, cause the parallel connection of a plurality of wet current circuit.Obviously, the isolating device between the DSL circuit of a plurality of parallel connections is an inductance, and inductance is big more to the high more signal attenuation of frequency, low frequency signal is presented the characteristic of low-resistance.Usually pure digi-tal DSL technology is used the baseband signal transmission, signal frequency is usually between 0～600kHz, and the emissive power major part concentrates on lower frequency band, so inductance can not reach good isolation effect, article one, the signal on the DSL circuit inevitably can be by being inductively coupled on the other DSL circuit, thereby it is serious to cause crosstalking between line.
3. the generation of wet current is configured to have certain break-make frequency usually, therefore the constant pressure source that produces wet current is designed to ON/OFF intermittently usually, controlled by CPU and be used for controlling open/close signal, this need take the control signal of the resource output certain frequency of CPU.
Summary of the invention
In view of this, the utility model provides a kind of wet current implement device, for the DSL circuit provides stable wet current.
For reaching above-mentioned utility model purpose, adopt following technical scheme:
A kind of implement device of wet current comprises protection and filtration module, it is characterized in that, also comprises controlled constant current source module;
Described controlled constant current source module receives the control level that the control wet current produces, and produces wet current according to this control level, and wet current is sent to protection and filtration module;
Described protection and filtration module are connected with described controlled constant current source module, and it receives wet current and carries out low-pass filtering, and filtered electric current is carried out overvoltage and overcurrent protection, and the wet current bridge joint is gone in one road DSL circuit.
Preferably, the I/O pin of central processing unit output high-low level in the DSL local side unit is controlled described controlled constant current source module and is produced wet current.
Preferably, described controlled constant current source module can comprise wet current generation module, wet current detection module and trigger module;
Described trigger module receives the high-low level that the control wet current produces, and this level is sent to described wet current generation module, controls described wet current generation module and produces wet current;
Described wet current generation module according to the control level of described trigger module output, produces wet current and sends to protection and filtration module;
Described wet current detection module is coupled to the wet current generation module, whether the wet current generation module is produced wet current detect, and testing result is exported to the DSL local side unit of the described DSL circuit of control.
Preferably, described wet current generation module can comprise one or more wet current generation units that structure is identical, and described wet current detection module can comprise one or more wet current detecting units that structure is identical;
Described trigger module receives the control level that the control wet current produces, and this level is sent to all wet current generation units in the described wet current generation module, controls described wet current generation unit and produces wet current;
Described wet current generation unit, according to the control level of described trigger module output, control produces wet current;
Described wet current detecting unit is coupled to corresponding wet current generation unit in the wet current generation module, whether the respective wet current generating unit is produced wet current detect, and testing result is exported to the DSL local side unit of the described DSL circuit of control.
Preferably, described trigger module can be the first optocoupler triode, and described wet current generation unit can comprise first, second grade negative feedback amplifier circuit, and described wet current detecting unit can be the second optocoupler triode;
The described first optocoupler triode is serially connected with described second level negative feedback amplifier circuit, receives the high-low level that the control wet current produces, conducting or by described first, second grade negative feedback amplifier circuit;
Described first order negative feedback amplifier circuit is made of two triode serial connections;
Described second level negative feedback amplifier circuit, identical with described first order negative feedback amplifier circuit structure, and be serially connected by resistance and first order negative feedback amplifier circuit, produce stable wet current;
The described second optocoupler triode is serially connected with first order negative feedback amplifier circuit, detected wet current is produced level send to central processing unit in the outside DSL local side unit.
Preferably, can the shunt voltage comparer between described first optocoupler triode output and the output of second level negative feedback amplifier circuit.
Preferably, this device can also comprise a wet current control module;
Described wet current control module, the output high-low level is controlled described controlled constant current source module and is produced wet current.
Preferably, described wet current control module can be 555 timers, and its output terminal links to each other with the described first optocoupler triode.
Preferably, described wet current control module may further include I
2C first interface sub-module, enable driving circuit and I
2C second interface sub-module;
Described I
2The I of central processing unit in the input end of C first interface sub-module and the described DSL local side unit
2The C bus links to each other, and its output terminal is with I
2After expanding to parallel data, the serial data of the high-low level that the total line traffic control wet current of C produces links to each other with the input end that enables driving circuit;
The output of described 555 timers links to each other with the Enable Pin that enables driving circuit;
The described output terminal that enables driving circuit links to each other with the corresponding controlled constant current source module of parallel data of process expansion;
Described I
2The input end of C second interface sub-module links to each other with the corresponding controlled constant current source module of parallel data through expansion, and parallel data is converted to after the serial data I of central processing unit in its output terminal and described DSL local side unit
2The C bus links to each other.
Preferably, the described output terminal that enables driving circuit can link to each other with the first optocoupler triode in the corresponding controlled constant current source module of parallel data of passing through expansion;
Described I
2The input end of C second interface sub-module with link to each other through the second optocoupler triode in the corresponding controlled constant current source module of parallel data of expansion, its output terminal with parallel data be converted to again after the serial data with DSL local side unit in the I of central processing unit
2The C bus links to each other.
Preferably, described I
2C first interface sub-module and I
2C second interface sub-module can be I
2The C interface chip, the described driving circuit that enables comprises tri-state output driver.
Preferably, described controlled constant current source module can be thick-film device spare.
As seen from the above technical solution, wet current implement device of the present utility model utilizes controlled constant current source to replace controlled constant pressure source to produce wet current.Because constant current source is during as power supply, the size of current of its generation is invariable, so the utility model utilizes constant current source to produce electric current, just can guarantee that the wet current size on the DSL circuit is stablized, and satisfies the requirement of European standard and Unite States Standard (USS) simultaneously; In addition, the utility model provides a constant current source separately for every road DSL circuit, so just avoids several to the parallel connection of DSL circuit, thereby avoids coupled noise between loop, reduces the influence of wet current circuit to DSL circuit transmission performance, improves the stability of DSL business.As seen, the utility model can be the stable wet current of DSL circuit, reduces the influence of wet current circuit to DSL circuit transmission performance simultaneously, improves the stability of DSL business.
Description of drawings
Fig. 1 for the structure of existing wet current implement device and with the connection layout of external unit.
Fig. 2 is the circuit theory diagrams of controlled constant pressure source module in the existing wet current implement device.
Fig. 3 is the circuit theory diagrams of filtering and protection module in the existing wet current implement device.
Fig. 4 be wet current implement device embodiment one of the present utility model structure and with the external unit connection layout.
Fig. 5 be wet current implement device embodiment two of the present utility model structure and with the external unit connection layout.
Fig. 6 is the circuit theory diagrams of controlled constant current source module among the wet current implement device embodiment two of the present utility model.
Fig. 7 be the utility model embodiment three the wet current implement device structure and with the external unit connection layout.
Fig. 8 is the circuit theory diagrams of wet current control module among the utility model embodiment three.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the embodiment that develops simultaneously illustrates embodiment of the present utility model.
Basic thought of the present utility model is: utilize controlled constant current source to replace controlled constant pressure source to produce wet current, make that the wet current size on the circuit is stable, can satisfy the requirement of European standard and Unite States Standard (USS) simultaneously; In addition, the utility model provides a constant current source separately for every road DSL circuit, so just avoids several to the parallel connection of DSL circuit, thereby avoids coupled noise between loop, reduces the influence of wet current circuit to DSL loop transmission performance.
Embodiment one:
Fig. 4 be wet current implement device embodiment one of the present utility model structure and with the external unit connection layout.
As shown in Figure 4, wet current implement device 410 is made of controlled constant current source module 411, protection and filtration module 412.Wherein controlled constant current source module 411 produces wet current as power supply, and goes into one road DSL circuit by filtering and protection module 412 bridge joints, inserts xTU-R430 at last, for this DSL circuit provides wet current; Simultaneously, the switch of controlled constant current source module 411 can be controlled by the I/O pin of CPU among the xTU-C420, by CPU control I/O pin output high-low level, control in the controlled constant current source module 4 11 whether produce wet current, thereby reach the open/close purpose of control wet current.Wet current circuit implement device 410 just can provide wet current for one road DSL circuit under the control of xTU-C 420 like this.In addition, the switch of controlled constant current source module 411 can also be controlled by toggle switch.
By present embodiment as seen, power supply of the present utility model adopts controlled constant current source module 411 to realize, make that the size of current on the circuit is stable, simultaneously, the utility model provides a constant current source separately for every road DSL circuit, so just avoid several, thereby avoid coupled noise between loop, reduce of the influence of wet current circuit DSL circuit transmission performance to the parallel connection of DSL circuit.
Embodiment two:
Fig. 5 be the utility model embodiment two the wet current implement device structure and with the connection layout of external unit.
As shown in Figure 5, in the present embodiment, wet current implement device 500 comprises controlled constant current source module 510, wet current control module 530 and two protection and filtration module 520.Wherein, controlled constant current source module 510 comprises the first wet current generation unit 511, the second wet current generation unit 5110, the first wet current detecting unit 512, the second wet current detecting unit 5120 and trigger module 513; Wet current control module 530 comprises 555 timers 531.The first wet current generation unit 511 and the second wet current generation unit 5110 have constituted the wet current generation module, the first wet current detecting unit 512 and the second wet current detecting unit 5120 have constituted the wet current detection module, in the present embodiment promptly, the wet current generation module comprises two wet current generation units that structure is identical, the wet current detection module comprises two wet current detecting units that structure is identical, like this, just can under the control of a trigger module, produce and detect the stable wet current of two-way.As seen, the structure difference of the structure of present embodiment and wet current implement device shown in Figure 1 is, increase wet current control module 530 in the present embodiment, and controlled constant current source module 510 has been carried out refinement, be divided into trigger module, wet current generation module and wet current detection module.
As shown in Figure 5, under the control of trigger module 513 555 timers 531 in wet current control module 530 in the controlled constant current source module 510, be triggered, and this triggering level passed to the first and second wet current generation units 511 and 5110, the first and second wet current generation units 511 and 5110 produce one road wet current respectively, and go into one road DSL circuit by two filtering and protection module 520 bridge joints respectively, insert xTU-R 540 at last, for this DSL circuit provides wet current; The output terminal of the first wet current detecting unit 512 links to each other with the I/O mouth of CPU among the xTU-C550, the high-low level that characterizes wet current production in the first wet current generation unit 511 can be sent to the CPU among the xTU-C550, in like manner, the output terminal of the second wet current detecting unit 5120 links to each other with the I/O mouth of CPU among the xTU-C550, and the high-low level of the wet current production in the second wet current generation unit 5110 is sent to the CPU among the xTU-C550.
In the present embodiment, the built-up circuit figure of controlled constant current source module 510 as shown in Figure 6.
Fig. 6 is the circuit theory diagrams of the controlled constant current source module of the embodiment of the invention two.
As shown in Figure 6, the first wet current generation unit 511 constitutes identical with the circuit of the second wet current generation unit 5110, the first wet current detecting unit 512 is identical with the circuit formation of the second wet current detecting unit 5120, and the physical circuit that trigger module 513 shows trigger module constitutes.Circuit theory diagrams with the first wet current generation unit 511, the first wet current control module 512 and the trigger module 513 shown in Fig. 6 are example below, illustrate that wet current produces and the whole flow process of control.
In the physical circuit of the first wet current generation unit 511, direct current supply voltage is-40V～60V, and this voltage is added in Vbat and BGND two ends, when loop circuit impedance during smaller or equal to 12K Ω, can produce the wet current of 3.0mA～5.0mA.
The output terminal of 555 timers 531 among the switch of trigger module 513 control pin ENABLE and Fig. 5 links to each other.When a certain moment, the signal that 555 timers 531 produce is a high level, and then the control level of switch control pin ENABLE output also is a high level, the first optocoupler triode U1B conducting so; Triode Q01 in the first wet current generation unit 511 and Q02 serial connection form first order negative feedback amplifier circuit, triode Q03 and Q04 serial connection form second level negative feedback amplifier circuit, when A0, B0 line are linked into protection shown in Figure 5 and filtration module 520, and after the DSL loop of protection and filtering circuit access inserted terminal device, these two negative-feedback circuits are can holding current constant, become constant current source.Wet current in the first wet current detecting unit 512 detects pin OFFHOOK0 and links to each other with the I/O mouth of CPU among the xTU-C550 shown in Fig. 5, is used for the wet current of detection line.When having electric current to flow through in the circuit of the first wet current generation unit 511, the second optocoupler triode U01 conducting, wet current detects pin OFFHOOK0 output low level, expression has detected wet current, so just can detect pin OFFHOOK0 by wet current this level is sent to CPU among the xTU-C550.
When a certain moment, the signal that 555 timers 531 produce is a low level, be that the switch control pin ENABLE of trigger module 513 is when being low level, the first optocoupler triode U1B ends, there is not electric current to produce in the first wet current generation unit 511, at this moment, the second optocoupler triode of the first wet current detecting unit 512 also U01 ends, wet current detects pin OFFHOOK0 no-output, expression does not detect wet current, and at this moment the CPU among the xTU-C550 also just knows does not have wet current to produce in the first wet current generation unit.
In addition, the wet current in the present embodiment produces circuit and should satisfy certain line leak impedance and require: impedance between A0 line and B0 line 〉=100K Ω, A0 line earth impedance 〉=100K Ω, B0 line earth impedance 〉=100K Ω
In actual applications, for the consideration of low-cost and low PCB area occupied, controlled constant current source module can be designed to a thick film circuit.And when A0 line or B0 line bump ground, may cause the constant current source thick film circuit to damage, so the circuit of wet current generation unit 511 has also designed A0, the B0 line bumps the ground defencive function:
1), when on the DSL circuit that A0 and B0 line insert not during connecting terminal equipment (xTU-R), the A0 line bumps ground, Q01 and Q02 can end, because R04 is big (hundreds of K Ω), triode Q03 can not be provided enough base bias currents, triode Q03, Q04 are ended, and constant current source thick film 510 can not damage, and circuit recovers back constant current source thick film can operate as normal.
2), when on the DSL circuit that A0 and B0 line insert during connecting terminal equipment (xTU-R), if wet current produces the circuit operate as normal, B0 line voltage is near VBAT voltage, voltage comparator U02 (R terminal voltage-A terminal voltage) is less than or equal to 1.24V, U02 ends; If the A0 line bumps ground, Q01 and Q02 can end, this moment, whether Q03, Q04 be by deciding on impedance (terminal impedance+line impedance) between A0 and B0 line, if impedance is less between A0 and B0 line, B0 line voltage raises, when the R of U02 terminal voltage-A terminal voltage during greater than 1.24V, the C end output voltage of U02 is identical with the A end, cause Q03, Q04 to end, constant current source thick film 510 can not damage, and circuit recovers back constant current source thick film can operate as normal.
3), when the B0 line bumps when ground, the R terminal voltage of U02 raises, the output voltage of K end is identical with the A end, causes Q03, Q04 to end, the constant current source thick film can not damage, circuit recovers back constant current source thick film energy operate as normal.
As seen from Figure 6, the VBAT0 in the Vbat0 in the first wet current generation unit 511 and the second wet current generation unit 5110 is same electrical voltage point, for distinguishing two different wet current generation units, it is distinguished from literary style.As can be seen, trigger module 513 has been controlled the generation of wet current in the first and second wet current generation units 511 and 5110 simultaneously, and trigger module utilizes one first optocoupler triode U1B to control the first and second wet current generation units 511 and 5110 and produced a stable wet current respectively.Wherein, the first wet current generation unit 511 is added in electric current by pin A0 and B0 the input end of one tunnel protection and filtration module 520, and the second wet current generation unit 5110 is added in the input end of another road protection and filtration module by pin A1 and B1 with electric current, and their one road DSL circuits of respectively doing for oneself provide wet current like this.
In the present embodiment, the circuit theory of controlled constant current source module is simple, and the device of use has only the low-cost components and parts of resistance, triode, voltage comparator and optocoupler.The circuit of certain controlled constant current source module constitutes the circuit form that can also adopt other to be realized, as long as can realize producing the effect of constant wet current.Compare with embodiment one, present embodiment further increases a wet current detection module in controlled constant current source module, can make the wet current production in the ppu real-time detection circuit, convenient monitoring and management.In addition, the generation of wet current is that 555 timers are controlled by a wet current control module, so just needn't take the control signal of the resource output certain frequency of CPU again, has saved system resource.
Embodiment three:
Fig. 7 be the utility model embodiment three the wet current implement device structure and with the connection layout of external unit.As shown in Figure 7, this device comprises that controlled constant current source module 710, protection and filtering mould determine 720 and wet current control module 730.Wherein, controlled constant current source module 710 is made of wet current generation module 711, wet current detection module 712 and trigger module 713; Wet current control module 730 is by 555 timers 731, I
2 C interface module 732 and enable driving circuit 733 and constitute, and I
2The C interface module has further comprised I
2C interface first submodule 7321 and the I
2C interface second submodule 7322.As seen, the difference of the structure of the structure of present embodiment and wet current implement device shown in Figure 5 is, has increased I
2 C interface module 732 and enable driving circuit 733.
Fig. 8 is the circuit theory diagrams of wet current control module in the wet current implement device of the utility model embodiment three.Introduce the course of work of present embodiment below in conjunction with Fig. 7 and Fig. 8.
In the present embodiment, the formation of the controlled constant current source module 510 among controlled constant current source module 710 and the embodiment two is basic identical, and just it has only realized the generation and the detection of one road wet current.I among Fig. 7
2The I of C interface module 732
2C interface first submodule 7321 and the I
2C interface second submodule 7322 and the physical circuit schematic diagram that enables driving circuit 733 are as shown in Figure 8.Wherein, I
2C interface first submodule 7321 and the I
2C interface second submodule 7322 is respectively a slice I
2The C interface chip constitutes, for example the PCA555 interface chip of PHILIPS; Enable driving circuit 733 and constitute, for example 74ABT244 by a tri-state output driver.I
2The signal input part pin two 2 of C interface first submodule 7321 and 23 and xTU-C750 in the I of CPU
2The C bus links to each other, with the I of CPU among the xTU-C750
2The C serial data expands to the output of eight bit parallel data, and these eight signal output part pin one 3-20 link to each other with eight the signal input part pin ones 1,13,15,17,8,6,4,2 that enable driving circuit 733 respectively; Whether the signal output part of 555 timers 731 links to each other with the output enable end pin 9 that enables driving circuit 733, control to enable driving circuit 733 and work; Eight the signal output part pin ones 8,16,14,12,3,5,7,9 that enable driving circuit 733 link to each other respectively with through corresponding eight the controlled constant current source modules of expanding 710 of eight bit parallel data, specifically link to each other with wet current switch control pin ENABLE in eight controlled constant current source modules 710, corresponding eight the controlled constant current source modules 710 of eight bit parallel data described and through expansion link to each other, promptly through I
2The parallel data of C interface first submodule 7321 expansion is controlled a controlled constant current source module respectively, with eight controlled constant current source modules be to concern one to one.Suppose that two constant current sources of a wet current switch control pin ENABLE control produce wet current, eight constant current source thick films can be controlled the generation of ten six road wet currents altogether, to the detection case of 16 OFFHOOK pin output wet currents should be arranged, so I
2Ten six road signal input part pin 4-11, the pin one 3-20 of C interface second submodule 7322 detects pin OFFHOOK with corresponding 16 wet currents and links to each other, and the sixteen bit parallel data is converted to I
2C serial signal, and the I of CPU among this serial signal output terminal and the xTU-C750
2The C bus links to each other.Like this, when the signal output part of 555 timers 731 was low level, the output terminal that enables driving circuit 733 was enabled, if the I of CPU among the xTU-C750 at this moment
2The C bus sends high level and requires certain constant current source to produce electric current, and this level just can pass through I
2C interface first submodule 7321 sends the input end that enables driving circuit 733 to, enable driving circuit 733 and this high level is sent to the ENABLE pin of wet current generation module 711, just can produce wet current in the wet current generation module 711 like this, be linked in certain road DSL loop by protection and filtration module 720.When wet current detection module 712 detects when having wet current to produce in the circuit, wet current detects pin OFFHOOK0 or OFFHOOK1 is a low level, and this level value is passed through I
2C interface second submodule 7322 sends the I of CPU among the xTU-C750 to
2The C bus.
By as can be seen above-mentioned, in the present embodiment, the I of central processing unit
2The generation of wet current in ten six road DSL circuits can be controlled and detect to the C bus simultaneously.Present embodiment is compared with embodiment two, increases by timer and I
2The wet current control module that the C interface module constitutes utilizes timer to produce square-wave signal, the I of association system like this
2The C bus is through I
2Parallel I/O the signal of C interface first module expansion, control the Enable Pin of constant current source, thereby the generation of control wet current, the situation of wet current on the monitoring circuit at any time simultaneously, enabling from the serial bus control wet current of system like this, save system resource, reduce control the taking of wet current the central processing unit resource.
Being preferred embodiment of the present utility model only below, is not to be used to limit protection domain of the present utility model.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (12)
1, a kind of implement device of wet current comprises protection and filtration module, it is characterized in that, also comprises controlled constant current source module;
Described controlled constant current source module receives the control level that the control wet current produces, and produces wet current according to this control level, and wet current is sent to protection and filtration module;
Described protection and filtration module are connected with described controlled constant current source module, and it receives wet current and carries out low-pass filtering, and filtered electric current is carried out overvoltage and overcurrent protection, and the wet current bridge joint is gone in one road DSL circuit.
2, device according to claim 1 is characterized in that, the I/O pin of central processing unit output high-low level in the DSL local side unit is controlled described controlled constant current source module and produced wet current.
3, device according to claim 1 is characterized in that, described controlled constant current source module comprises wet current generation module, wet current detection module and trigger module;
Described trigger module receives the high-low level that the control wet current produces, and this level is sent to described wet current generation module, controls described wet current generation module and produces wet current;
Described wet current generation module according to the control level of described trigger module output, produces wet current and sends to protection and filtration module;
Described wet current detection module is coupled to the wet current generation module, whether the wet current generation module is produced wet current detect, and testing result is exported to the DSL local side unit of the described DSL circuit of control.
4, device according to claim 3 is characterized in that, described wet current generation module comprises one or more wet current generation units that structure is identical, and described wet current detection module comprises one or more wet current detecting units that structure is identical;
Described trigger module receives the control level that the control wet current produces, and this level is sent to all wet current generation units in the described wet current generation module, controls described wet current generation unit and produces wet current;
Described wet current generation unit, according to the control level of described trigger module output, control produces wet current;
Described wet current detecting unit is coupled to corresponding wet current generation unit in the wet current generation module, whether the respective wet current generating unit is produced wet current detect, and testing result is exported to the DSL local side unit of the described DSL circuit of control.
5, device according to claim 4 is characterized in that, described trigger module is the first optocoupler triode, and described wet current generation unit comprises first, second grade negative feedback amplifier circuit, and described wet current detecting unit is the second optocoupler triode;
The described first optocoupler triode is serially connected with described second level negative feedback amplifier circuit, receives the high-low level that the control wet current produces, conducting or by described first, second grade negative feedback amplifier circuit;
Described first order negative feedback amplifier circuit is made of two triode serial connections;
Described second level negative feedback amplifier circuit, identical with described first order negative feedback amplifier circuit structure, and be serially connected by resistance and first order negative feedback amplifier circuit, produce stable wet current;
The described second optocoupler triode is serially connected with first order negative feedback amplifier circuit, detected wet current is produced level send to central processing unit in the DSL local side unit.
6, device according to claim 5 is characterized in that, shunt voltage comparer between described first optocoupler triode output and the output of second level negative feedback amplifier circuit.
7, device according to claim 5 is characterized in that, this device also comprises a wet current control module;
Described wet current control module, the output high-low level is controlled described controlled constant current source module and is produced wet current.
8, device according to claim 7 is characterized in that, described wet current control module is 555 timers, and its output terminal links to each other with the described first optocoupler triode.
9, device according to claim 8 is characterized in that, described wet current control module further comprises I
2C first interface sub-module, enable driving circuit and I
2C second interface sub-module;
Described I
2The I of central processing unit in the input end of C first interface sub-module and the described DSL local side unit
2The C bus links to each other, and its output terminal is with I
2After expanding to parallel data, the serial data of the high-low level that the total line traffic control wet current of C produces links to each other with the input end that enables driving circuit;
The output of described 555 timers links to each other with the Enable Pin that enables driving circuit;
The described output terminal that enables driving circuit links to each other with the corresponding controlled constant current source module of parallel data of process expansion;
Described I
2The input end of C second interface sub-module links to each other with the corresponding controlled constant current source module of parallel data through expansion, and parallel data is converted to after the serial data I of central processing unit in its output terminal and described DSL local side unit
2The C bus links to each other.
10, device according to claim 9 is characterized in that, the described output terminal that enables driving circuit with link to each other through the first optocoupler triode in the corresponding controlled constant current source module of parallel data of expansion;
Described I
2The input end of C second interface sub-module with link to each other through the second optocoupler triode in the corresponding controlled constant current source module of parallel data of expansion, parallel data is converted to after the serial data I of central processing unit in its output terminal and DSL local side unit
2The C bus links to each other.
11, device according to claim 9 is characterized in that, described I
2C first interface sub-module and I
2C second interface sub-module is I
2The C interface chip, the described driving circuit that enables comprises tri-state output driver.
According to the arbitrary described device of claim 1 to 11, it is characterized in that 12, described controlled constant current source module is the thick film device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620122938 CN200941164Y (en) | 2006-08-04 | 2006-08-04 | Wet current realizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620122938 CN200941164Y (en) | 2006-08-04 | 2006-08-04 | Wet current realizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200941164Y true CN200941164Y (en) | 2007-08-29 |
Family
ID=38747342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620122938 Expired - Lifetime CN200941164Y (en) | 2006-08-04 | 2006-08-04 | Wet current realizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200941164Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754539A (en) * | 2010-02-03 | 2010-06-23 | 海洋王照明科技股份有限公司 | Sampling circuit, LED drive circuit and method for detecting electric quantity of battery |
| CN102572158A (en) * | 2012-01-20 | 2012-07-11 | 华为技术有限公司 | Asymmetrical digital subscriber loop (ADSL) equipment and wetting current control method |
| CN106471595A (en) * | 2014-07-18 | 2017-03-01 | 通用电气智能平台有限公司 | The universal contact part supporting programmable wetting current inputs |
-
2006
- 2006-08-04 CN CN 200620122938 patent/CN200941164Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754539A (en) * | 2010-02-03 | 2010-06-23 | 海洋王照明科技股份有限公司 | Sampling circuit, LED drive circuit and method for detecting electric quantity of battery |
| CN101754539B (en) * | 2010-02-03 | 2014-05-07 | 海洋王照明科技股份有限公司 | Sampling circuit, LED drive circuit and method for detecting electric quantity of battery |
| CN102572158A (en) * | 2012-01-20 | 2012-07-11 | 华为技术有限公司 | Asymmetrical digital subscriber loop (ADSL) equipment and wetting current control method |
| CN102572158B (en) * | 2012-01-20 | 2014-07-30 | 华为技术有限公司 | Asymmetrical digital subscriber loop (ADSL) equipment and wetting current control method |
| CN106471595A (en) * | 2014-07-18 | 2017-03-01 | 通用电气智能平台有限公司 | The universal contact part supporting programmable wetting current inputs |
| US10217573B2 (en) | 2014-07-18 | 2019-02-26 | Ge Intelligent Platforms, Inc. | Universal contact input supporting programmable wetting current |
| CN106471595B (en) * | 2014-07-18 | 2019-04-19 | 通用电气智能平台有限公司 | Support the universal contact part input of programmable wetting current |
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