CN103323656A - Terminal equipment power fail detection circuit - Google Patents
Terminal equipment power fail detection circuit Download PDFInfo
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- CN103323656A CN103323656A CN2013102293962A CN201310229396A CN103323656A CN 103323656 A CN103323656 A CN 103323656A CN 2013102293962 A CN2013102293962 A CN 2013102293962A CN 201310229396 A CN201310229396 A CN 201310229396A CN 103323656 A CN103323656 A CN 103323656A
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Abstract
The invention discloses a terminal equipment power fail detection circuit. The terminal equipment power fail detection circuit is applied to communication system terminal equipment, and comprises a terminal equipment input power supply module, a power supply voltage dividing processing module and a power supply voltage power fail monitoring and alarming output module, wherein the terminal equipment input power supply module is connected with the power supply voltage dividing processing module, and the power supply voltage dividing processing module is connected with the power supply voltage power fail monitoring and alarming output module. The terminal equipment power fail detection circuit has the advantages of greatly reducing wrong DYING-GASP reporting ratio because a logic gate circuit with a Schmidt trigger function is adopted, being simple in structure and small in occupied PCB layout space, achieving a low-cost and high-reliability power fail alarming function, and being capable of reliably reporting power fail alarming to local-side equipment on the premise that large-capacity energy storage capacitors are not installed.
Description
Technical field
The present invention relates to terminal device DYING-GASP(power fail warning) technical field, relate in particular to a kind of terminal device detecting down circuit.
Background technology
VDSL(Very-high-bit-rate Digital Subscriber loop, very high bit rate digital subscriber line) for the needs of operation maintenance and equipment control, local side apparatus needs the various states of accurate recording terminal device, one of them important project is the terminal device power down, terminal device is responsible for after power down takes place, in the last time, send power fail warning message by coaxial cable to local side apparatus.After local side apparatus is received this message, not only can note the reason of this terminal device communicating interrupt, and can avoid producing the alarm that other there is no need.By power fail warning, the reason that the operation maintenance personnel can distinguish equipment off-line is disconnected fibre or power down, for the maintenance of network provides important basis.Present VDSL terminal device all is equipped with big capacity storage capacitor, big capacity storage capacitor takes up room too big, in order to adapt to future development trend, communication apparatus is day by day to miniature development, relate in particular to the new terminals size, when cost has strict demand, the use of big capacity storage capacitor is unfavorable for microminiaturization, but in the situation that big capacity storage capacitor is not installed, the device looses power alarm can not effectively be carried out.
Chinese invention patent application (publication number: CN102938553A) disclose a kind of power fail warning control circuit, comprised isolation module and all connected slow startup module, DYING-GASP energy storage module and monitoring module; This invention can suppress the peak current that powers on, and can provide the sufficient power down retention time to finish the DYING-GASP process, reduces the wrong report of DYING-GASP.
(publication number: CN101895341A) disclose the method for a kind of terminal device and power failure alarm reporting thereof, terminal device comprises power module, user function module, power fail warning module in the Chinese invention patent application; This invention is by the beginning with input voltage and the relatively more definite power down process of preset reference voltage, stop the work of user function module by control signal, thereby reduced the consumption of user function circuit to electric energy greatly, the system that greatly reduces has guaranteed that to the demand of storage capacitor capacity the power fail warning signal has time enough to send to local side apparatus reliably.
Therefore, the shortcoming of prior art is the power-fail detection circuit complexity, must use big capacity storage capacitor, the cost height, and PCB layout difficulty is unfavorable for the microminiaturization development of communication terminal device, circuit for detecting poor anti jamming capability, reliability are not high.
Summary of the invention
At the problem of above-mentioned existence, the present invention discloses a kind of terminal device detecting down circuit, under the situation that big capacity storage capacitor is not installed, can report power fail warning to local side apparatus reliably.
To achieve these goals, the present invention adopts following technical scheme:
A kind of terminal device detecting down circuit, it is applied in the communication system terminal unit, wherein, comprises the terminal device input power module, supply voltage voltage division processing module, and supply voltage power down monitoring and alarm output module; Described terminal device input power module connects described supply voltage voltage division processing module, and described supply voltage voltage division processing module connects described supply voltage power down monitoring and alarm output module; Described terminal device input power module is imported an input voltage to described supply voltage voltage division processing module, the described input voltage of described supply voltage voltage division processing module clamper obtains clamp voltage, and described supply voltage voltage division processing module is imported described supply voltage power down monitoring and alarm output module with described clamp voltage; The trigger voltage that output module is established a control alarm signal output is monitored and is alarmed in described supply voltage power down, and described supply voltage power down is monitored and alarmed output module and detects to export detecting level as a result after whether described clamp voltage is lower than described trigger voltage; When described terminal device power down, described supply voltage power down monitoring and alarm output module detect described clamp voltage and are lower than described trigger voltage, described supply voltage power down monitoring and alarm output module outputting alarm signal low level.
Above-mentioned terminal device detecting down circuit, wherein, described terminal device input power module is also established a normal voltage value and a low level magnitude of voltage, and when described terminal device powered on, described input voltage was described normal voltage value; When described terminal device power down, described input voltage is reduced to described low level magnitude of voltage gradually, and described input voltage is described low level magnitude of voltage.
Above-mentioned terminal device detecting down circuit, wherein, described terminal device input power module comprises one first electric capacity, when described terminal device powered on, described first electric capacity charged; During described terminal device power down, described first electric capacity discharges.
Above-mentioned terminal device detecting down circuit, wherein, described supply voltage voltage division processing module comprises one first resistance and one second resistance, the electric potential difference at the described second resistance two ends is described clamp voltage.
Above-mentioned terminal device detecting down circuit, wherein, described supply voltage power down monitoring and alarm output module comprise that one has supply voltage power down monitoring and the alarm chip of Schmidt trigger.
Above-mentioned terminal device detecting down circuit, wherein, second pin of described supply voltage power down monitoring and alarm chip is detected described clamp voltage and whether is lower than described trigger voltage, when detecting described clamp voltage when being higher than described trigger voltage, the 4th pin output of described supply voltage power down monitoring and alarm chip is with nowhere to turn to alert signal high level; When described clamp voltage is lower than described trigger voltage, the output of the 4th pin of described supply voltage power down monitoring and alarm chip in bound-time by being the alarm signal low level with nowhere to turn to the saltus step of alert signal high level.
Above-mentioned terminal device detecting down circuit, wherein, described bound-time is 5-15ns.
Above-mentioned terminal device detecting down circuit, wherein, described supply voltage power down monitoring and alarm output module also comprise one the 3rd resistance and one second electric capacity.
The present invention has following advantage or beneficial effect:
1, adopts the logic gates of band application schmitt trigger function, the trigger voltage value of the DYING-GASP function in the terminal device is arranged on just outputting alarm level of the negative edge voltage that satisfies fully when being higher than power down, greatly reduces the probability of wrong report DYING-GASP;
2, circuit structure is simple and easy, and it is little to take the PCB arrangement space, has realized power fail warning function low-cost, high reliability;
3, under the situation that big capacity storage capacitor is not installed, can report power fail warning to local side apparatus reliably.
Description of drawings
Fig. 1 is the module principle figure of first embodiment of terminal device detecting down circuit of the present invention;
Fig. 2 is the circuit structure diagram of second embodiment of terminal device detecting down circuit of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and specific embodiment, but not as restriction of the present invention.
The first embodiment of the present invention relates to a kind of terminal device detecting down circuit, it is applied in the communication system terminal unit, referring to Fig. 1, comprises terminal device input power module S101, supply voltage voltage division processing module S201, and supply voltage power down monitoring and alarm output module S301.
Wherein, terminal device input power module S101 connects supply voltage voltage division processing module S201, and supply voltage voltage division processing module S201 connects supply voltage power down monitoring and alarm output module S301; Terminal device input power module S101 imports an input voltage to supply voltage voltage division processing module S201, supply voltage voltage division processing module S201 clamper input voltage obtains clamp voltage, and supply voltage voltage division processing module S201 is with clamp voltage input supply voltage power down monitoring and alarm output module S301.
Supply voltage power down monitoring and alarm output module S301 establish the trigger voltage that a control alarm signal is exported, and level was as a result detected in output after whether supply voltage power down monitoring and alarm output module S301 detecting clamp voltage were lower than trigger voltage.
When the terminal device power down, supply voltage power down monitoring and alarm output module S301 detect clamp voltage and are lower than trigger voltage, supply voltage power down monitoring and alarm output module S301 outputting alarm signal low level; When terminal device powered on, supply voltage power down monitoring and alarm output module S301 detected clamp voltage and are higher than trigger voltage, and supply voltage power down monitoring and alarm output module S301 output are with nowhere to turn to alert signal high level.
Further, terminal device input power module S101 also establishes a normal voltage value and a low level magnitude of voltage, and when terminal device powered on, input voltage was the normal voltage value; When the terminal device power down, input voltage is reduced to the low level magnitude of voltage gradually, and input voltage is the low level magnitude of voltage.The normal voltage value here is the voltage of normally used terminal device when operate as normal just, and the normal voltage value of general home terminal be+12V, and the low level magnitude of voltage that other establishes that an input voltage is reduced to gradually is+10.5V.
The second embodiment of the present invention relates to a kind of terminal device detecting down circuit, and present embodiment improves on the basis of first embodiment.Referring to Fig. 2, terminal device input power module S101 comprises one first capacitor C 1, and this first capacitor C 1 is first electric capacity, is used for storing the DYING-GASP energy; When terminal device powered on, first capacitor C 1 was charged; During the terminal device power down, first capacitor C 1 is discharged.Especially the parameter of this first capacitor C 1 is " 470 μ F, 25V, RAD5.0 ", and electric capacity has only 470 μ F, compares much smaller with big capacity first electric capacity of the prior art.And terminal device input power module S101 also comprises+supply voltage of 12V inserts.
In addition, supply voltage voltage division processing module S201 comprises that the electric potential difference at one first resistance R 1 and one second resistance R, 2, the second resistance R, 2 two ends is clamp voltage.Supply voltage power down monitoring and alarm output module S301 comprise that one has supply voltage power down monitoring and the alarm chip U9 of Schmidt trigger, its model is SN74AHC1G08DCKR, this supply voltage power down monitoring and alarm chip U9 comprise 5 doors, namely comprise 5 pins, wherein, whether second pin detecting clamp voltage of supply voltage power down monitoring and alarm chip U9 is lower than trigger voltage, when detecting clamp voltage when being higher than trigger voltage, the 4th pin output of supply voltage power down monitoring and alarm chip U9 is with nowhere to turn to alert signal high level; When clamp voltage is lower than trigger voltage, the output of the 4th pin of supply voltage power down monitoring and alarm chip U9 in bound-time by being the alarm signal low level with nowhere to turn to the saltus step of alert signal high level.The bound-time here is 5-15ns, and preferably, bound-time is 10ns.Also have, trigger voltage is 1.5V.Supply voltage power down monitoring and alarm output module S301 also comprise one the 3rd resistance R 3 and one second capacitor C 2.
That is to say that the concrete principle of work of present embodiment is as follows:
One, when terminal device power on (the normal voltage value for+12V) time, first capacitor C 1 can be charged, the input voltage clamper of supply voltage voltage division processing module S201 general+12V, powering on when stablizing, the electric potential difference at second resistance R, 2 two ends is 1.7V, be that the clamp voltage that supply voltage power down monitoring and second pin of alarming chip U9 receive is 1.7V, and the trigger voltage of supply voltage power down monitoring and alarm output module S301 is 1.5V, this moment, clamp voltage had the surplus of 0.2V with respect to trigger voltage, second pin of supply voltage power down monitoring and alarm chip U9 detects clamp voltage and is higher than trigger voltage, therefore the 4th pin output of supply voltage power down monitoring and alarm chip U9 is with nowhere to turn to alert signal high level, the CPU of terminal device detects this with nowhere to turn to alert signal high level, guarantee the terminal device operate as normal, can not measure the alarm signal low level by flase drop.
Two, when the terminal device power down (the low level magnitude of voltage is+10.5V) time, 1 beginning of first capacitor C is slowly discharged and is accompanied by+reduction of 12V level, when being reduced to 10.5V, the input voltage clamper of supply voltage voltage division processing module S201 general+10.5V, the electric potential difference at second resistance R, 2 two ends is 1.49V, be lower than trigger voltage 1.5V, have the supply voltage power down monitoring of Schmidt trigger and second pin of alarm chip U9 this moment and detect the trigger voltage value that the clamp voltage negative edge arrives 1.5V, be that clamp voltage is lower than trigger voltage, the 4th pin of supply voltage power down monitoring this moment and alarm chip U9 will become the alarm signal low level with introskip at 10ns, the CPU of terminal device detects this alarm signal low level, just realizes the DYING-GASP function.
Three, when terminal device returned to normal voltage value+12V, the electric potential difference at second resistance R, 2 two ends was got back to 1.7V, and the 4th pin output of supply voltage power down monitoring and alarm chip U9 is with nowhere to turn to alert signal high level, and the function of terminal device can normally be used.
By above-mentioned two embodiment as can be seen, the present invention adopts the logic gates of band application schmitt trigger function, greatly reduce the probability of wrong report DYING-GASP, and circuit structure is simple and easy, it is little to take the PCB arrangement space, under the situation that big capacity storage capacitor is not installed, realized power fail warning function low-cost, high reliability.
It should be appreciated by those skilled in the art that those skilled in the art can realize described variation example in conjunction with prior art and above-described embodiment, such variation example does not influence flesh and blood of the present invention, does not repeat them here.
More than preferred embodiment of the present invention is described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, wherein the equipment of not describing in detail to the greatest extent and structure are construed as with the common mode in this area and are implemented; Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or being revised as the equivalent embodiment of equivalent variations, this does not influence flesh and blood of the present invention.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (8)
1. a terminal device is detected down circuit, and it is applied to it is characterized in that in the communication system terminal unit, comprises the terminal device input power module, supply voltage voltage division processing module, and supply voltage power down monitoring and alarm output module; Described terminal device input power module connects described supply voltage voltage division processing module, and described supply voltage voltage division processing module connects described supply voltage power down monitoring and alarm output module;
Described terminal device input power module is imported an input voltage to described supply voltage voltage division processing module, the described input voltage of described supply voltage voltage division processing module clamper obtains clamp voltage, and described supply voltage voltage division processing module is imported described supply voltage power down monitoring and alarm output module with described clamp voltage;
The trigger voltage that output module is established a control alarm signal output is monitored and is alarmed in described supply voltage power down, and described supply voltage power down is monitored and alarmed output module and detects to export detecting level as a result after whether described clamp voltage is lower than described trigger voltage;
When described terminal device power down, described supply voltage power down monitoring and alarm output module detect described clamp voltage and are lower than described trigger voltage, described supply voltage power down monitoring and alarm output module outputting alarm signal low level.
2. terminal device detecting down circuit according to claim 1 is characterized in that described terminal device input power module is also established a normal voltage value and a low level magnitude of voltage, and when described terminal device powered on, described input voltage was described normal voltage value; When described terminal device power down, described input voltage is reduced to described low level magnitude of voltage gradually, and described input voltage is described low level magnitude of voltage.
3. terminal device detecting down circuit according to claim 1 and 2 is characterized in that described terminal device input power module comprises one first electric capacity, and when described terminal device powered on, described first electric capacity charged; During described terminal device power down, described first electric capacity discharges.
4. terminal device detecting down circuit according to claim 1 is characterized in that described supply voltage voltage division processing module comprises one first resistance and one second resistance, and the electric potential difference at the described second resistance two ends is described clamp voltage.
5. terminal device detecting down circuit according to claim 1 is characterized in that, described supply voltage power down monitoring and alarm output module comprise that one has supply voltage power down monitoring and the alarm chip of Schmidt trigger.
6. terminal device according to claim 5 is detected down circuit, it is characterized in that, second pin of described supply voltage power down monitoring and alarm chip is detected described clamp voltage and whether is lower than described trigger voltage, when detecting described clamp voltage when being higher than described trigger voltage, the 4th pin output of described supply voltage power down monitoring and alarm chip is with nowhere to turn to alert signal high level; When described clamp voltage is lower than described trigger voltage, the output of the 4th pin of described supply voltage power down monitoring and alarm chip in bound-time by being the alarm signal low level with nowhere to turn to the saltus step of alert signal high level.
7. terminal device detecting down circuit according to claim 6 is characterized in that described bound-time is 5-15ns.
8. terminal device detecting down circuit according to claim 5 is characterized in that, described supply voltage power down monitoring and alarm output module also comprise one the 3rd resistance and one second electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102293962A CN103323656A (en) | 2013-06-08 | 2013-06-08 | Terminal equipment power fail detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102293962A CN103323656A (en) | 2013-06-08 | 2013-06-08 | Terminal equipment power fail detection circuit |
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| CN103323656A true CN103323656A (en) | 2013-09-25 |
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| CN2013102293962A Pending CN103323656A (en) | 2013-06-08 | 2013-06-08 | Terminal equipment power fail detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
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2013
- 2013-06-08 CN CN2013102293962A patent/CN103323656A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| JPS60100058A (en) * | 1983-11-07 | 1985-06-03 | Fuji Electric Corp Res & Dev Ltd | Power failure detection circuit |
| JPH02116758A (en) * | 1988-10-27 | 1990-05-01 | Tokyo Electric Co Ltd | Power failure detector |
| JPH06351258A (en) * | 1993-06-08 | 1994-12-22 | Meidensha Corp | Circuit for dealing with power interruption of inverter |
| US7285989B2 (en) * | 2003-12-17 | 2007-10-23 | Samsung Electronics Co., Ltd. | Device for detection of power-off |
| CN200962514Y (en) * | 2006-10-25 | 2007-10-17 | 深圳桑达国际电子器件有限公司 | Electricity drop detection device |
| CN201001039Y (en) * | 2006-12-29 | 2008-01-02 | 深圳市振华微电子有限公司 | Great current DC power supply instant power-off retaining circuit |
| CN102338823A (en) * | 2010-07-27 | 2012-02-01 | 深圳长城开发科技股份有限公司 | Power failure detection method and circuit for electric meter system |
| CN202583307U (en) * | 2012-05-30 | 2012-12-05 | 太仓市同维电子有限公司 | Power-down alarming graded detecting circuit for broadband terminal device with backup battery |
Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
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