CN101478151A - Voltage detection and control circuit - Google Patents
Voltage detection and control circuit Download PDFInfo
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- CN101478151A CN101478151A CNA2009100056275A CN200910005627A CN101478151A CN 101478151 A CN101478151 A CN 101478151A CN A2009100056275 A CNA2009100056275 A CN A2009100056275A CN 200910005627 A CN200910005627 A CN 200910005627A CN 101478151 A CN101478151 A CN 101478151A
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- voltage
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- voltage detecting
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Abstract
The invention relates to a voltage detection and control circuit which comprises a switching control unit and a capacitor unit, wherein, the switching control unit is connected between the cathode end of a diode and a voltage detection point, the capacitor unit comprises a first capacitor and a second capacitor, wherein, the first capacitor is connected with the switching control unit, and the second capacitor is connected with the cathode end of the diode. The invention adopts the capacitor unit with the smaller capacitance value, and the DSL user-side device still has sufficient surplus power to send out a power failure signal during the power failure so as to reduce the manufacture cost of the integral circuit.
Description
Technical field
The present invention is relevant for a kind of voltage detecting and control circuit, and the present invention adopts the capacitor unit of smaller capacitive value, just can make the DSL subscriber hold equipment to still have enough dump powers to send a power-off signal when outage, to reduce the cost that integrated circuit is made.
Background technology
Using the DSL subscriber to hold equipment (for example: when the ADSL modem) carrying out the broadband line, may cause the DSL subscriber to hold the equipment line to interrupt because of power breakdown.
In order to allow the ISP network manager know that the DSL line interrupts being caused by power breakdown, G.992.1, DSL international standards ITU stipulates that the DSL subscriber holds equipment before the DSL line interrupts fully, must send a power-off signal (Dying Gasp signal) to the ISP network management terminal, with as the basis for estimation of ISP webmaster personnel on the DSL network failure.
Yet, the DSL subscriber holds equipment losing under the situation of electric power, can't operate and send this power-off signal, therefore, way in the past all can add large capacitor in DSL subscriber's end equipment, so that DSL subscriber's end equipment still has enough dump powers can send power-off signal.
See also Figure 1A, be the common structural representation that is applied to the voltage detecting circuit on DSL subscriber's end equipment.As shown in the figure, voltage detecting circuit 10 includes a diode 13, the positive terminal of this diode 13 will connect an external power source 11 on a voltage detecting point 17, this external power source 11 can be produced by a transformer (power adapter) conversion one civil power, and the negative pole end of diode 13 will be connected to a large capacitor 15 (as 4400UF).In addition, voltage detecting point 17 will be connected with a power-off signal test side, and 17 power supply states that detect this external power source 11 will be put by voltage detecting in this power-off signal test side, whereby to notify DSL subscriber's end equipment to send a power-off signal.
Moreover when external power source 11 instant cut-offs, large capacitor 15 stored electric charges will provide the DSL subscriber to hold the of short duration working power of equipment, so that the DSL subscriber holds equipment to still have enough dump powers to send power cut-off information when outage.Again, in outage, the end-point voltage Vd (+) of voltage detecting point 17 will slowly discharge, and when end-point voltage Vd (+) is discharged to electronegative potential, the power-off signal test side will notify DSL subscriber's end equipment to send power-off signal according to this change in voltage.
Though large capacitor 15 can provide the DSL subscriber to hold the more dump power of equipment to send a power-off signal, relative also cause negative influence.
When DSL subscriber's end equipment was started shooting, the moment that external power source 11 begins to power, large capacitor 15 can be easy to generate surge current (inrushing current), caused transformer to start overcurrent protection, and the situation that allows the DSL subscriber hold equipment to start shooting.And, adopt large capacitor 15 to increase many costs than small capacitor, it is unfavorable to cause on manufacturing for manufacturer.
Perhaps, in order to solve the problem of surge current, some manufacturer is divided into the capacitor 151/153 (as 2200UF) of two and half capacitances with large capacitor (15), shown in Figure 1B, and series connection one diode 155 on the capacitor 151 therein, and on diode 155 resistance 157 in parallel.Implement according to this, power supply 11 moment of beginning to power externally, with regard to capacitor 151/153, though capacitor 153 still can produce surge current, but diode 155 and parallel resistor 157 thereof can produce surge current by suppression capacitor 151, and therefore the surge current that the DSL subscriber holds equipment to produce will significantly reduce.But, though this measure can successfully reduce the surge current size,, the total value capacitance of capacitor 151/153 still approximately is equal to capacitor 15, there is no usefulness in the control for cost.
Moreover, in the moment of outage, end-point voltage Vd (+) on the voltage detecting point 17 still can receive this slowly discharge in order to the stored electric charge of internal capacitor of the transformer of generation external power source 21, discharge slowly will delay the time that end-point voltage Vd (+) reaches electronegative potential, and make DSL subscriber's end equipment delay the situation of learning outage, and in the process that end-point voltage Vd (+) slowly discharges, the DSL subscriber holds the internal capacitor of equipment also will follow to discharge, because DSL subscriber's end equipment needs the normal operation of minimum operating voltage ability, learn outage condition if delay, relative DSL subscriber holds equipment from learning that outage condition is to (for example: about 14ns) will therefore compress, also may cause the DSL subscriber to hold equipment can't successfully send power-off signal operating processing time of sending between power-off signal.
Summary of the invention
Main purpose of the present invention is to provide a kind of voltage detecting and control circuit, will adopt the capacitor of smaller capacitive value, with the size of reduction surge current, and therefore reduces the cost that integrated circuit is made, to improve the space that DSL subscriber's end equipment is made a profit.
Secondary objective of the present invention, be to provide a kind of voltage detecting and control circuit, when outage takes place, the end-point voltage of voltage detecting point can be discharged to electronegative potential immediately, so that DSL subscriber's end equipment is learnt powering-off state ahead of time, thereby elongate the processing time that the DSL subscriber holds equipment, make it have adequate time to produce power-off signal.
For achieving the above object, the invention provides a kind of voltage detecting and control circuit, its structure includes: a switch control unit be connected between the negative pole end and a voltage detecting point of a diode, and the positive terminal of diode connects an external power source on voltage detecting point; And a capacitor unit, including one first capacitor and one second capacitor, first capacitor connects switch control unit, and second capacitor connects the negative pole end of diode.
Description of drawings
Figure 1A: for being known in the electrical block diagram of the voltage detecting circuit on DSL subscriber's end equipment;
Figure 1B: be another electrical block diagram of the voltage detecting circuit of known application on DSL subscriber's end equipment;
Fig. 2: the circuit box schematic diagram of holding equipment one preferred embodiment for DSL subscriber of the present invention;
Fig. 3: for the present invention is applied to the voltage detecting on DSL subscriber's end equipment and the electrical block diagram of control circuit one preferred embodiment.
Wherein, Reference numeral:
10 voltage detecting circuits, 11 external power sources
13 diodes, 15 capacitors
17 voltage detecting are put 151 capacitors
153 capacitors, 155 diodes
157 resistance, 200 voltage detecting and control circuit
20 external power sources, 30 voltage detecting and control circuit
301 voltage detecting are put 31 switch control units
33 first ON-OFF control circuit, 331 first diodes
333 first derailing switches, 335 first resistors
35 second switch control circuits, 351 second diodes
353 second switch devices, 355 second resistors
357 the 3rd resistors, 37 capacitor units
371 first capacitors, 373 second capacitors
40 diodes, 50 power-off signal testing circuits
Embodiment
See also Fig. 2 and Fig. 3, for DSL subscriber of the present invention holds the circuit box schematic diagram of equipment one preferred embodiment and is applied to voltage detecting on DSL subscriber's end equipment and the electrical block diagram of control circuit one preferred embodiment.As shown in the figure, voltage detecting of the present invention and control circuit 30 will be applied to a DSL subscriber and hold equipment 200 (for example: the ADSL modem), voltage detecting is connected an external power source 20 and a diode 40 on a voltage detecting point 301 with control circuit 30, external power source 20 can be produced by a transformer (poweradapter) conversion one civil power, for example: AC 110V to DC 12V, the power of transformer end will be inserted in the electric power connecting hole (not shown) that the DSL subscriber holds equipment 200, hold equipment 200 with supply external power source 20 to the DSL subscriber.
Voltage detecting and control circuit 30 can be put the power supply situation of 301 detection external power sources 20 by voltage detecting, and when civil power is jumped the situation of electricity, the end-point voltage Vd (+) that controls immediately on the voltage detecting point 301 is discharged to electronegative potential, allow the DSL subscriber hold equipment 200 to learn powering-off state ahead of time, and elongate the processing time that the DSL subscriber holds equipment 200, make it have adequate time to produce a power-off signal (Dying Gasp signal).Whereby, distal end I SP network management terminal can learn that the DSL subscriber holds the reason of equipment 200 network outage to be caused by outage, to stop to hold equipment 200 to carry out the line test for the DSL subscriber.
The DSL subscriber holds equipment 200 to include a power-off signal testing circuit 50, this power-off signal testing circuit 50 connects voltage detecting point 301, and it mainly determines whether send this power-off signal in order to the change in voltage that detects the end-point voltage Vd (+) on the voltage detecting point 301.
Again, the DSL subscriber holds equipment 200 still to include a system handles circuit 60, and it holds the processing core of equipment 200 for the DSL subscriber.This system handles circuit 60 connects diode 40 and voltage detecting and control circuit 30, to receive this power-off signal that this power-off signal testing circuit is produced, the DSL subscriber holds equipment 200 outwards to send this power-off signal by this system handles circuit 60, and is passed to the ISP network management terminal.
Moreover in another embodiment of the present invention, power-off signal testing circuit 50 can be selected to be integrated in this system handles circuit 60, to become a system combination circuit.
Voltage detecting of the present invention and control circuit 30 include switch control unit 31 and capacitor unit 37.301 of the negative pole end of switch control unit 31 connection diodes 40 and voltage detecting points, the positive terminal of diode 40 still connects external power source 20 and voltage detecting point 301 in addition.And capacitor unit 37 includes one first capacitor 371 and one second capacitor 373, this first capacitor 371 connects switch control unit 31, its tie point between the two produces one first voltage (V1), and this second capacitor 373 connects the negative pole end of this diode 40.
When the DSL subscriber holds equipment 200 to start shooting; the moment that external power source 20 begins to power; switch control unit 31 will make the capacitor 371 of winning charge slowly; produce surge current (inrushing current) to suppress first capacitor 371; this moment, surge current that capacitor unit 37 produced will only remaining second capacitor 373, caused transformer to start overcurrent protection to avoid excessive surge current and can't start shooting smoothly.Then, the slow charging that first capacitor 371 can continue, up to fill full till, and first capacitor 371 (for example: 12V) will be same as second capacitor 373 fills the full charge value that stores.
In addition, externally (for example: civil power is jumped) during power supply 20 instant cut-offs, first capacitor 371 on the capacitor unit 37 and second capacitor, 373 stored electric charges will supply power to the DSL subscriber and hold equipment 200, (for example: 3V), so the DSL subscriber holds equipment 200 to still have enough electric power can carry out calculation process when outage and sends this power-off signal in minimum operating voltage so that the DSL subscriber holds equipment 200 to keep a period of time.
Continue, when externally power supply 20 produced outage, the end-point voltage Vd (+) of voltage detecting point 301 will discharge, and the negative pole end voltage Vd (-) of diode 40 also can follow and discharges.When negative pole end voltage vd (-) continuous discharge, and make the voltage difference between negative pole end voltage Vd (-) and first voltage (V1) (for example: in the time of 0.7V) surpass switch control unit 31 default conducting voltage, therefore switch control unit 31 will start, the switch control unit 31 that starts will draw end-point voltage Vd (+) repid discharge of falling voltage detecting point 301 to electronegative potential, so the power-off signal testing circuit 50 that connects voltage detecting point 301 will be learnt the situation of outage according to the end-point voltage Vd (+) of electronegative potential, and therefore produce this power-off signal.
Again, the detailed circuit structure of first ON-OFF control circuit 33 includes one first diode 331, one first derailing switch 333 and one first resistor 335.The negative pole end of first diode 331 connects the negative pole end of diode 40; First derailing switch 333 connects the positive terminal of first diode 331 and the negative pole end of diode 40 respectively; A wherein end of first resistor 335 is connected in the negative pole end of diode 40, and the other end connects first capacitor 371 and first derailing switch 333 altogether.Moreover the tie point that first resistor 335, first capacitor 371 and first derailing switch are 333 will have this first voltage V1, and the tie point between the positive terminal of first derailing switch 333 and first diode 331 will have this second voltage V2.
And the detailed circuit structure of second switch control circuit 35 includes one second diode 351, a second switch device 353, one second resistor 355 and one the 3rd resistor 357.The negative pole end ground connection of second diode 351; Second switch device 353 is connected in 301 of the positive terminal of second diode 351 and voltage detecting points; A wherein end of second resistor 355 connects second switch device 353, and the other end connects first ON-OFF control circuit 33; A wherein end of the 3rd resistor 357 and second resistor 355 are connected in 33 its tie points generations of first ON-OFF control circuit altogether second voltage (V2), other end ground connection.
Moreover first derailing switch 333 of the present invention's first ON-OFF control circuit 33 and the second switch device 353 of second switch control circuit 35 may be selected to be a two-carrier transistor, a metal oxide semiconductor transistor or a field-effect transistor.
The operating voltage that case of external power supply 20 is provided is 12V, and when externally power supply 20 produces outage, the negative pole end voltage Vd (-) of diode 40 will follow end-point voltage Vd (+) and discharge.If negative pole end voltage Vd (-) discharge, and make conducting voltage Vth that voltage difference between negative pole end voltage Vd (-) and first voltage (V1) surpasses first derailing switch 333 (for example: in the time of 0.7V), therefore first derailing switch 333 will start, and the tie point voltage (V2) of 331 of first derailing switch 333 and first diodes will transfer the state of HI from LOW to, and then the second switch device 353 that triggers second switch control circuit 35 is opened.The second switch device 353 of conducting will make end-point voltage Vd (+) be discharged to electronegative potential fast.
Comprehensively above-mentioned, when voltage detecting of the present invention and control circuit 30 take place in outage, voltage detecting can be put 301 end-point voltage Vd (+) draws fast and reduces to electronegative potential, so that power-off signal testing circuit 50 is learnt powering-off state ahead of time, then learn that from power-off signal testing circuit 50 powering-off state to system handles circuit 60 no enough electric power (for example: 20ns) compared to common technology (for example: about 14ns) will prolong manyly, make it have adequate time to send power-off signal send processing time between power-off signal.Moreover, owing to learn outage condition ahead of time, therefore capacitor unit 37 of the present invention can adopt the first capacitor 37l and second capacitor 373 of smaller capacitive value, for example: be respectively 1000UF, so not only can reduce the DSL subscriber holds equipment 200 to produce the size of surge current, and reduce the cost that integrated circuit is made whereby, to improve the space that the DSL subscriber holds equipment 200 to make a profit.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. voltage detecting and control circuit is characterized in that its structure includes:
One switch control unit be connected between the negative pole end and a voltage detecting point of a diode, and the positive terminal of this diode connects an external power source on this voltage detecting point; And
One capacitor unit includes one first capacitor and one second capacitor, and this first capacitor connects this switch control unit, and its tie point between the two produces one first voltage, and this second capacitor connects the negative pole end of this diode.
2. voltage detecting according to claim 1 and control circuit, it is characterized in that, when the negative pole end voltage of this diode and the voltage difference between this first voltage surpass the default conducting voltage of this switch control unit, to start this switch control unit, and cause end-point voltage repid discharge on this voltage detecting point to electronegative potential.
3. voltage detecting according to claim 1 and control circuit is characterized in that, this switch control unit includes:
One first ON-OFF control circuit connects the negative pole end of this diode and this first capacitor of this capacitor unit, and the tie point between this first ON-OFF control circuit and this first capacitor produces this first voltage; And
One second switch control circuit connects this voltage detecting point and this first ON-OFF control circuit, and the generation of the tie point between this second switch control circuit and this first ON-OFF control circuit has one second voltage.
4. voltage detecting according to claim 3 and control circuit, it is characterized in that, when the negative pole end voltage of this diode and the voltage difference between this first voltage surpass this conducting voltage that this switch control unit is scheduled to, this second voltage that this first ON-OFF control circuit produces high potential will be started, trigger this second switch control circuit whereby and start, cause end-point voltage repid discharge on this voltage detecting point to electronegative potential.
5. voltage detecting according to claim 1 and control circuit is characterized in that, this voltage detecting and control circuit are applied on DSL subscriber's end equipment.
6. voltage detecting according to claim 5 and control circuit is characterized in that, this DSL subscriber's end equipment includes a power-off signal testing circuit, and this power-off signal testing circuit connects this voltage detecting point, and in order to produce a power-off signal.
7. voltage detecting according to claim 6 and control circuit, it is characterized in that, this DSL subscriber's end equipment includes a system handles circuit, this system handles circuit connects this diode and this voltage detecting and control circuit, and receives this power-off signal that this power-off signal testing circuit is produced.
8. voltage detecting according to claim 7 and control circuit is characterized in that, this power-off signal testing circuit is integrated in this system handles circuit.
9. voltage detecting according to claim 3 and control circuit is characterized in that, this first ON-OFF control circuit includes:
One first diode, negative pole end connects the negative pole end of this diode;
One first derailing switch connects the positive terminal of this first diode and the negative pole end of this diode respectively, and the tie point between the positive terminal of this first derailing switch and this first diode produces this second voltage; And
One first resistor, wherein an end is connected in the negative pole end of this diode, and the other end connects this first capacitor and this first derailing switch altogether, and its tie point produces this first voltage.
10. voltage detecting according to claim 3 and control circuit is characterized in that, this second switch control circuit includes:
One second diode, negative pole end ground connection;
One second switch device is connected between the positive terminal and this voltage detecting point of this second diode;
One second resistor, wherein an end connects this second switch device, and the other end connects this first ON-OFF control circuit; And
One the 3rd resistor, wherein an end and this second resistor are connected in this first ON-OFF control circuit altogether, and its tie point produces this second voltage, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100056275A CN101478151B (en) | 2009-01-20 | 2009-01-20 | Voltage detection and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100056275A CN101478151B (en) | 2009-01-20 | 2009-01-20 | Voltage detection and control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101478151A true CN101478151A (en) | 2009-07-08 |
| CN101478151B CN101478151B (en) | 2012-05-30 |
Family
ID=40838797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100056275A Expired - Fee Related CN101478151B (en) | 2009-01-20 | 2009-01-20 | Voltage detection and control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101478151B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801536A (en) * | 2011-05-27 | 2012-11-28 | 国基电子（上海）有限公司 | Network communication equipment |
| CN105024536A (en) * | 2015-07-10 | 2015-11-04 | 广东美的制冷设备有限公司 | Power supply circuit of inverter power supply and household appliance having same |
-
2009
- 2009-01-20 CN CN2009100056275A patent/CN101478151B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801536A (en) * | 2011-05-27 | 2012-11-28 | 国基电子（上海）有限公司 | Network communication equipment |
| CN102801536B (en) * | 2011-05-27 | 2014-12-10 | 国基电子（上海）有限公司 | Network communication equipment |
| CN105024536A (en) * | 2015-07-10 | 2015-11-04 | 广东美的制冷设备有限公司 | Power supply circuit of inverter power supply and household appliance having same |
| CN105024536B (en) * | 2015-07-10 | 2018-01-02 | 广东美的制冷设备有限公司 | The power supply circuit of inverter and there are its household electrical appliance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101478151B (en) | 2012-05-30 |
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Granted publication date: 20120530 Termination date: 20140120 |