CN109031038A - A kind of method and circuit for realizing power fail warning in PON far end system - Google Patents
A kind of method and circuit for realizing power fail warning in PON far end system Download PDFInfo
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- CN109031038A CN109031038A CN201810514977.3A CN201810514977A CN109031038A CN 109031038 A CN109031038 A CN 109031038A CN 201810514977 A CN201810514977 A CN 201810514977A CN 109031038 A CN109031038 A CN 109031038A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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Abstract
The invention discloses a kind of in PON far end system realizes the method and circuit of power fail warning, is related to power fail warning technical field, method includes the following steps: S1, being sequentially connected comparator, photoelectric conversion module and PON chip；S2, a bleeder circuit is arranged to comparator；S3, ONU input voltage is monitored using comparator and bleeder circuit, when ONU input voltage is located at preset alarm voltage or less, photoelectric conversion module sends power fail warning signal to PON chip.The present invention is matched using comparator and photoelectric conversion module, when ONU input voltage is located at preset alarm voltage or less, PON chip is enabled to learn that ONU equipment can not work normally.
Description
Technical field
The present invention relates to power fail warning technical fields, and in particular to a kind of that power fail warning is realized in PON far end system
Method and circuit.
Background technique
Currently, PON far end system joined power fail warning function more, when the power supply of ONU is unable to satisfy system worked well
When, system can send out a signal automatically and give terminal OLT device (optical line terminal), thus inform OLT device, ONU equipment
It may can not work normally, OLT device will make respective reaction and record.
Traditional power fail warning mode is mostly that this function is realized using reset chip and a large amount of electrolytic capacitor, existing
The relatively input voltage that the circuit of some DYING-GASP, that is, power fail warnings usually sets threshold value, can ensure to fall in this way
The electric retention time is greater than 4ms, makes warning message have the sufficient time to send, but when power grid fluctuates, compares appearance
Easily occur input voltage drop to DYING-GASP threshold value hereinafter, but on the minimum voltage that system can work normally, this
Sample system can also quote DYNG-GASP, but there is no power down for system, that is, report by mistake.Therefore this implementation generates DYING-GASP
The risk of wrong report is relatively high, and a large amount of OTING-GASP electrolytic capacitor can cause very big to power on peak current.
Therefore, it is badly in need of providing a kind of higher power fail warning mode of precision, to reduce going out for power fail warning wrong report situation
It is existing.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide one kind realizes in PON far end system
The method and circuit of power fail warning, are matched using comparator and photoelectric conversion module, when ONU input voltage is positioned at preset
When below alarm voltage, PON chip is enabled accurately to learn that ONU equipment can not work normally.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A method of it realizing power fail warning in PON far end system, the described method comprises the following steps:
It is sequentially connected comparator, photoelectric conversion module and PON chip；
A bleeder circuit is arranged to the comparator；
ONU input voltage is monitored using the comparator and the bleeder circuit, when ONU input voltage is positioned at preset
When below alarm voltage, the photoelectric conversion module sends power fail warning signal to the PON chip；Wherein,
The alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above PON
The charge threshold level that ONU power module can not work in far end system.
The present invention is matched using comparator and photoelectric conversion module, the comparator and the bleeder circuit phase
Cooperation, for monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage or less, comparator generates one
Electric current is sucked, so that photoelectric conversion module sends signal to PON chip, so that PON chip can learn ONU equipment
It can not work normally.
Based on the above technical solution, the step of arranging bleeder circuit specifically includes the following steps:
The first bleeder circuit is set up, first bleeder circuit includes first resistor in parallel, second resistance and first
Capacitor；
The second bleeder circuit is set up, second bleeder circuit includes concatenated 3rd resistor and the 4th resistance；
The input terminal of first bleeder circuit is connected into the ONU input voltage, the input of second bleeder circuit
End ground connection, the reference of the output end of second bleeder circuit, the output end of first bleeder circuit and the comparator
End links together.
Based on the above technical solution, when the systems are operating normally, by by first resistor, second resistance, third
After the bleeder circuit of resistance and the 4th resistance composition, a monitoring level VR, the i.e. voltage at comparator reference end, VR can be obtained
Calculation formula it is as follows: VR=(VD-VI) * (R1//R2)/(R1//R2+R3+R4)；
Wherein R1 is first resistor, and R2 is second resistance, and R3 is 3rd resistor, and R4 is the 4th resistance, and VD is ONU input electricity
Pressure, and VI is then the voltage of the output end output of comparator；
R1//R2 in formula represent R1 it is in parallel with R2 after resistance value, wherein R1 and R2 be 5.9K Ω, R3 be 3.6K Ω, R4
For 44.2K Ω, three kinds of resistance use precision resistance.
Based on the above technical solution, R1 and R2 is 5.9K Ω, and R3 is 3.6K Ω, and R4 is 44.2K Ω；
The comparator selects the adjustable zener diode of TL431；
When the input voltage of the reference end of comparator is greater than 2.5V, the triode ON inside comparator, in comparator
Output end can generate a sucking electric current, which can drive the light emitting diode of optocoupler primary side side, so that it is shone, to make pair
The phototriode of avris is connected, and power fail warning signal is pulled down to 0V or so at this time, so when give the power down of PON chip
Alarm signal is low level, does not trigger alarm signal and reports；
And when the input voltage of the reference end of comparator is less than 2.5V, inside TL431, triode is not turned on, and is compared at this time
The output end of device does not have electric current generation, can not drive the light emitting diode of optocoupler primary side side, therefore the phototriode on secondary side
It cannot be connected, the power fail warning signal for giving PON chip at this time is raised, and triggers power fail warning signal reporting.
Based on the above technical solution, the alarm voltage is 43V, the electricity that the ONU power module can not work
Pressure critical value is 38V.
Invention additionally discloses a kind of in PON far end system realizes that the circuit of power fail warning, the circuit include:
Sequentially connected comparator, photoelectric conversion module and PON chip, the comparator are equipped with a bleeder circuit；
The comparator and the bleeder circuit are for monitoring ONU input voltage, when ONU input voltage is positioned at preset
When below alarm voltage, the photoelectric conversion module sends power fail warning signal to the PON chip；
The alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above PON
The charge threshold level that ONU power module can not work in far end system.
Based on the above technical solution, the bleeder circuit includes:
First bleeder circuit, first bleeder circuit include first resistor, second resistance and first capacitor in parallel；
Second bleeder circuit, second bleeder circuit include concatenated 3rd resistor and the 4th resistance；
The input terminal of first bleeder circuit connects the ONU input voltage, the input terminal of second bleeder circuit
Ground connection, the reference end of the output end of second bleeder circuit, the output end of first bleeder circuit and the comparator
It links together.
Based on the above technical solution, the resistance value of the first resistor and the second resistance is 5.9K Ω, institute
The resistance value for stating 3rd resistor is 3.6K Ω, and the resistance value of the 4th resistance is 44.2K Ω.
Based on the above technical solution, when the input voltage of the reference end is greater than 2.5V, the comparator
Sucking current output terminal generates the sucking electric current for driving the photoelectric conversion module to PON chip transmission signal.
Based on the above technical solution, the alarm voltage is 43V, the electricity that the ONU power module can not work
Pressure critical value is 38V.
Compared with the prior art, the advantages of the present invention are as follows:
(1) present invention is matched using comparator and photoelectric conversion module, when ONU input voltage is located at preset alarm
When below voltage, comparator generates a sucking electric current, so that photoelectric conversion module sends signal to PON chip, thus
PON chip is enabled to learn that ONU equipment can not work normally.
Detailed description of the invention
Fig. 1 is to scheme the step of realizing the method for power fail warning in the embodiment of the present invention 1 in PON far end system；
Fig. 2 is to scheme the step of realizing the method for power fail warning in the embodiment of the present invention 2 in PON far end system；
Fig. 3 is the internal structure chart of TL431 chip in the embodiment of the present invention 3；
Fig. 4 is the internal structure chart of KPS2801 in the embodiment of the present invention 3；
Fig. 5 is the structural schematic diagram for realizing the circuit of power fail warning in the embodiment of the present invention 4 in PON far end system；
Fig. 6 is the structural schematic diagram for realizing the circuit of power fail warning in the embodiment of the present invention 5 in PON far end system；
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
Embodiment 1
Shown in Figure 1, the embodiment of the present invention 1 provides a kind of method that power fail warning is realized in PON far end system, should
Method the following steps are included:
S1, comparator, photoelectric conversion module and PON chip are sequentially connected；
S2, a bleeder circuit is arranged to comparator；
S3, ONU input voltage is monitored using comparator and bleeder circuit, when ONU input voltage is located at preset alarm
When below voltage, photoelectric conversion module sends power fail warning signal to PON chip；Wherein,
Alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above the distal end PON
The charge threshold level that ONU power module can not work in system.
The present invention is matched using comparator and photoelectric conversion module, and comparator and bleeder circuit match, and is used
In monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage or less, comparator generates a sucking electricity
Stream, so that photoelectric conversion module sends signal to PON chip, so that PON chip can learn that ONU equipment can not be just
Often work.
The setting of alarm voltage can be selected according to the work requirements and device configuration of practical PON far end system, and
With the setting of alarm voltage, the part electronic component in bleeder circuit and this circuit is also adjusted as the case may be.
It should be noted that the adjustable zener diode of TL431 can be used in comparator, and photoelectric conversion module can be used
KPS2801 chip；
It is since the ground level of ONU input voltage and PON chip does not share and signal when the use of photoelectric conversion module
Component necessary to converting；
The effect of comparator is that front and back voltage compares, and reaches early warning voltage and generates alarm signal.
It should be noted that ONU power module is used to power to ONU equipment.
Embodiment 2
Shown in Figure 2, the embodiment of the present invention 2 provides a kind of method that power fail warning is realized in PON far end system, should
Method the following steps are included:
S1, comparator, photoelectric conversion module and PON chip are sequentially connected；
S2, a bleeder circuit is arranged to comparator；
S3, ONU input voltage is monitored using comparator and bleeder circuit, when ONU input voltage is located at preset alarm
When below voltage, photoelectric conversion module sends power fail warning signal to PON chip；Wherein,
Alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above the distal end PON
The charge threshold level that ONU power module can not work in system；
The present invention is matched using comparator and photoelectric conversion module, and comparator and bleeder circuit match, and is used
In monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage or less, comparator generates a sucking electricity
Stream, so that photoelectric conversion module sends signal to PON chip, so that PON chip can learn that ONU equipment can not be just
Often work.
The setting of alarm voltage can be selected according to the work requirements and device configuration of practical PON far end system, and
With the setting of alarm voltage, the part electronic component in bleeder circuit and this circuit is also adjusted as the case may be.
In the present embodiment, be arranged bleeder circuit the step of, i.e. step S2 specifically includes the following steps:
S201, the first bleeder circuit is set up, the first bleeder circuit includes first resistor in parallel, second resistance and first
Capacitor；
S202, the second bleeder circuit is set up, the second bleeder circuit includes concatenated 3rd resistor and the 4th resistance；
S203, the input terminal connection ONU input voltage by the first bleeder circuit, the input end grounding of the second bleeder circuit,
The reference end of the output end of second bleeder circuit, the output end of the first bleeder circuit and comparator links together.
Embodiment 3
The embodiment of the present invention provides a kind of method that power fail warning is realized in PON far end system, on the basis of embodiment 2
On, in this method:
The resistance value of first resistor and second resistance is 5.9K Ω, and the resistance value of 3rd resistor is 3.6K Ω, the 4th resistance
Resistance value is 44.2K Ω.
In the present embodiment, the voltage of comparator one end can be set as 2.5V, when the input voltage of the reference end of comparator is high
When 2.5V, the output end of comparator can generate a sucking electric current, and when the input voltage of the reference end of comparator is lower than
When 2.5V, the output end of comparator does not have electric current generation；
Since photoelectric conversion module is applied to primary side using primary side input signal using the KPS2801 chip of COSMO
The input current If, If that photoelectric conversion module is generated on light emitting diode and resistance drive light emitting diode, so that the light on secondary side
Quick triode ON generates Ic, and then generates Vout, achievees the purpose that transmit signal；
It is CTR (current transfer ratio) that primary side pair side, which directly drives association, to meet Ic≤If*CTR.
In the present embodiment, comparator select TL431 chip, photoelectric conversion module select KPS2801, TL431 chip and
The internal structure chart of KPS2801 passes through referring to Fig. 3,4 by the anode of pretreated ONU input voltage access comparator simultaneously
Bleeder circuit is sent into a monitoring level VR to the reference end of comparator, the original of the output end access photoelectric conversion module of comparator
The cathode of side light emitting diode, the anode of light emitting diode with connecing the simulation of power end, i.e. 0V；
The collector output level of the phototriode on photoelectric conversion module pair side is sent into PON chip and is believed as power fail warning
Number, while an external pull-up resistor, to 3.3V, when which is high level, PON chip can pass through OMCI (optical network unit pipe
Reason control interface) channel to OLT reports power down warning message, and the secondary edge emitting pole of photoelectric conversion module connects digitally.
When the systems are operating normally, ONU input voltage be 48V, by by first resistor, second resistance, 3rd resistor with
And the 4th resistance composition bleeder circuit after, the calculation formula that can obtain monitoring level a VR, VR is as follows: VR=(VD-VI) *
(R1//R2)/(R1//R2+R3+R4)；
Wherein R1 is first resistor, and R2 is second resistance, and R3 is 3rd resistor, and R4 is the 4th resistance, and VD is ONU input electricity
Pressure, and VI is then the voltage of the output end output of comparator；
R1//R2 in formula represent R1 it is in parallel with R2 after resistance value, wherein R1 and R2 be 5.9K Ω, R3 be 3.6K Ω, R4
For 44.2K Ω, three kinds of resistance use precision resistance；
It is calculated according to formula, when VD is 48V, VR is 2.79V at this time, and the input voltage of the reference end of comparator is greater than
Triode ON inside 2.5V, TL431 can generate a sucking electric current in the output end of comparator, which can drive light
The light emitting diode of coupling primary side side makes it shine, so that the phototriode of secondary side be made to be connected, power fail warning signal quilt at this time
Pulled down to 0V or so, so when give PON chip power fail warning signal be low level, do not trigger alarm signal and report；
And when the input voltage of the reference end of comparator is less than 2.5V, inside TL431, triode is not turned on, and is compared at this time
The output end of device does not have electric current generation, can not drive the light emitting diode of optocoupler primary side side, therefore the phototriode on secondary side
It cannot be connected, the power fail warning signal for giving PON chip at this time is raised, and triggers power fail warning signal reporting；
It therefore, is 43.01V by the triggering level that above-mentioned formula can calculate power fail warning using 2.5V as critical point,
That is power fail warning signal reporting will be triggered when the input voltage of ONU drops into 43V；
Since the threshold voltage value is only slightly higher than the voltage value that ONU power module can not work, i.e. 38V, so significantly
Reduce the risk of wrong report OTING-GASP.
In the present embodiment, when the input voltage of reference end is greater than 2.5V, the sucking current output terminal of comparator can be generated
For driving photoelectric conversion module to the sucking electric current of PON chip transmission signal.
In the present embodiment, alarm voltage is 43V, and the charge threshold level that ONU power module can not work is 38V, 38V or less
Voltage can not make ONU power module that can not work.
Embodiment 4
Shown in Figure 5, the embodiment of the present invention provides a kind of circuit that power fail warning is realized in PON far end system, should
Circuit includes:
Sequentially connected comparator, photoelectric conversion module and PON chip, comparator are equipped with a bleeder circuit；
Comparator and bleeder circuit are for monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage
When following, photoelectric conversion module sends power fail warning signal to PON chip；
Alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above the distal end PON
The voltage that ONU power module can not work in system；
The present invention is matched using comparator and photoelectric conversion module, and comparator and bleeder circuit match, and is used
In monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage or less, comparator generates a sucking electricity
Stream, so that photoelectric conversion module sends signal to PON chip, so that PON chip can learn that ONU equipment can not be just
Often work.
The setting of alarm voltage can be selected according to the work requirements and device configuration of practical PON far end system, and
With the setting of alarm voltage, the part electronic component in bleeder circuit and this circuit is also adjusted as the case may be.
It should be noted that TL431 chip can be used in comparator, and KPS2801 chip can be used in photoelectric conversion module.
Embodiment 5
Shown in Figure 6, the embodiment of the present invention provides a kind of circuit that power fail warning is realized in PON far end system, should
Circuit includes:
Sequentially connected comparator, photoelectric conversion module and PON chip, comparator are equipped with a bleeder circuit；
Comparator and bleeder circuit are for monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage
When following, photoelectric conversion module sends power fail warning signal to PON chip；
Alarm voltage is slightly above the charge threshold level that ONU power module can not work in PON far end system.
The present invention is matched using comparator and photoelectric conversion module, and comparator and bleeder circuit match, and is used
In monitoring ONU input voltage, when ONU input voltage is located at preset alarm voltage or less, comparator generates a sucking electricity
Stream, so that photoelectric conversion module sends signal to PON chip, so that PON chip can learn that ONU equipment can not be just
Often work.
The setting of alarm voltage can be selected according to the work requirements and device configuration of practical PON far end system, and
With the setting of alarm voltage, the part electronic component in bleeder circuit and this circuit is also adjusted as the case may be.
In the present embodiment, bleeder circuit includes:
First bleeder circuit, the first bleeder circuit include first resistor, second resistance and first capacitor in parallel；
Second bleeder circuit, the second bleeder circuit include concatenated 3rd resistor and the 4th resistance；
The input terminal of first bleeder circuit connects ONU input voltage, the input end grounding of the second bleeder circuit, the second partial pressure
The reference end of the output end of circuit, the output end of the first bleeder circuit and comparator links together.
It should be noted that wherein R1 is first resistor, R2 is second resistance, and R3 is 3rd resistor, and R4 is the 4th resistance,
And R5 is the 5th resistance, R6 is the 6th resistance, and R7 is the 7th resistance, and R4 is the 4th resistance, and C1 and C2 are respectively first capacitor
And second capacitor, DYING-GASP is for indicating that this route for sending signal to PON chip, and then carries out power fail warning；
In addition the resistance value of above-mentioned resistance and the capacitance size of capacitor can be configured according to demand；
It should be noted that C2 for anti-tampering, prevents voltage from shaking, and R6 is due to being the work with DYING-GASP
Make level connection, that is, keeps a fixed level, when the route where R7 is needed for sending signal to PON chip, due to
The end R6 keeps a fixed level and identical as the operation level of DYING-GASP, so can guarantee that power fail warning can be normal
It carries out, and R7 only plays the role of ordinary string resistance.
Embodiment 6
The embodiment of the present invention provides a kind of circuit that power fail warning is realized in PON far end system, on the basis of embodiment 5
It is upper:
The resistance value of first resistor and second resistance is 5.9K Ω, and the resistance value of 3rd resistor is 3.6K Ω, the 4th resistance
Resistance value is 44.2K Ω.
In the present embodiment, the voltage of comparator one end can be set as 2.5V, when the input voltage of the reference end of comparator is high
When 2.5V, the output end of comparator can generate a sucking electric current, and when the input voltage of the reference end of comparator is lower than
When 2.5V, the output end of comparator does not have electric current generation；
Since photoelectric conversion module is applied to primary side using primary side input signal using the KPS2801 chip of COSMO
The input current If, If that optocoupler is generated on light emitting diode and resistance drive light emitting diode, so that the phototriode on secondary side
Conducting generates Ic, and then generates Vout, achievees the purpose that transmit signal；
It is CTR (current transfer ratio) that primary side pair side, which directly drives association, to meet Ic≤If*CTR.
In the present embodiment, comparator selects TL431 chip, and photoelectric conversion module selects KPS2801, and process is pretreated
ONU input voltage accesses the anode of comparator, while being sent into the reference of a monitoring level VR to comparator by bleeder circuit
End, the cathode of the primary side light emitting diode of the output end access photoelectric conversion module of comparator, the anode of light emitting diode connect electricity
The simulation of source, i.e. 0V；
The collector output level of the phototriode on photoelectric conversion module pair side is sent into PON chip and is believed as power fail warning
Number, while an external pull-up resistor, to 3.3V, when which is high level, PON chip can pass through OMCI (optical network unit pipe
Reason control interface) channel to OLT reports power down warning message, and the secondary edge emitting pole of photoelectric conversion module connects digitally.
When the systems are operating normally, ONU input voltage be 48V, by by first resistor, second resistance, 3rd resistor with
And the 4th resistance composition bleeder circuit after, the calculation formula that can obtain monitoring level a VR, VR is as follows: VR=(VD-VI) *
(R1//R2)/(R1//R2+R3+R4)；
Wherein R1 is first resistor, and R2 is second resistance, and R3 is 3rd resistor, and R4 is the 4th resistance, and VD is ONU input electricity
Pressure, and VI is then the voltage of the output end output of comparator；
R1//R2 in formula represent R1 it is in parallel with R2 after resistance, wherein R1 and R2 be 5.9K Ω, R3 be 3.6K Ω, R4
For 44.2K Ω, three kinds of resistance use precision resistance；
It is calculated according to formula, when VD is 48V, VR is 2.79V at this time, and the input voltage of the reference end of comparator is greater than
Triode ON inside 2.5V, TL431 can generate a sucking electric current in the output end of comparator, which can drive light
The light emitting diode of coupling primary side side makes it shine, so that the phototriode of secondary side be made to be connected, power fail warning signal quilt at this time
Pull down to 0V or so, so when give PON chip power fail warning signal be low level, do not trigger alarm signal and report；
And when the input voltage of the reference end of comparator is less than 2.5V, inside TL431, triode is not turned on, and is compared at this time
The output end of device does not have electric current generation, can not drive the light emitting diode of optocoupler primary side side, therefore the phototriode on secondary side
It cannot be connected, the power fail warning signal for giving PON chip at this time is raised, and triggers power fail warning signal reporting；
It therefore, is 43.01V by the triggering level that above-mentioned formula can calculate power fail warning using 2.5V as critical point,
That is power fail warning signal reporting will be triggered when the input voltage of ONU drops into 43V；
Since the threshold voltage value is only slightly higher than the voltage value that ONU power module can not work, i.e. 38V, so significantly
Reduce the risk of wrong report OTING-GASP.
In the present embodiment, when the input voltage of reference end is greater than 2.5V, the sucking current output terminal of comparator can be generated
For driving photoelectric conversion module to the sucking electric current of PON chip transmission signal.
In the present embodiment, alarm voltage is 43V, and the charge threshold level that ONU power module can not work is 38V, 38V or less
Voltage can not make ONU power module that can not work.
It should be noted that as shown in Figure 6, the 0V on the right side of 0V and R4 on the left of R5 indicates to be grounded.
The present invention is not only limited to above-mentioned preferred forms, anyone can show that other are each under the inspiration of the present invention
The product of kind form, however, make any variation in its shape or structure, it is all with identical or similar with the present invention
Technical solution, within its protection scope.
Claims (10)
1. a kind of method for realizing power fail warning in PON far end system, which is characterized in that the described method comprises the following steps:
It is sequentially connected comparator, photoelectric conversion module and PON chip；
A bleeder circuit is arranged to the comparator；
ONU input voltage is monitored using the comparator and the bleeder circuit, when ONU input voltage is located at preset alarm
When below voltage, the photoelectric conversion module sends power fail warning signal to the PON chip；Wherein,
The alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above the distal end PON
The charge threshold level that ONU power module can not work in system.
2. the method for power fail warning is realized in PON far end system as described in claim 1, which is characterized in that the arranging
The step of bleeder circuit specifically includes the following steps:
The first bleeder circuit is set up, first bleeder circuit includes first resistor, second resistance and first capacitor in parallel；
The second bleeder circuit is set up, second bleeder circuit includes concatenated 3rd resistor and the 4th resistance；
The input terminal of first bleeder circuit is connected into the ONU input voltage, the input termination of second bleeder circuit
The reference end on ground, the output end of second bleeder circuit, the output end of first bleeder circuit and the comparator connects
It is connected together.
3. the method for power fail warning is realized in PON far end system as claimed in claim 2, it is characterised in that:
When the systems are operating normally, the partial pressure electricity by being made of first resistor, second resistance, 3rd resistor and the 4th resistance
Lu Hou, the calculation formula that can obtain monitoring level a VR, VR are as follows: VR=(VD-VI) * (R1//R2)/(R1//R2+R3+
R4)；
Wherein R1 is first resistor, and R2 is second resistance, and R3 is 3rd resistor, and R4 is the 4th resistance, and VD is ONU input voltage,
And VI is then the voltage of the output end output of comparator；
R1//R2 in formula represent R1 it is in parallel with R2 after resistance value, wherein R1 and R2 is 5.9K Ω, and R3 is 3.6K Ω, and R4 is
44.2K Ω, three kinds of resistance use precision resistance.
4. the method for power fail warning is realized in PON far end system as claimed in claim 3, it is characterised in that: R1 and R2
It is 3.6K Ω for 5.9K Ω, R3, R4 is 44.2K Ω；
The comparator selects TL431 chip；
When the input voltage of the reference end of comparator is greater than 2.5V, the triode ON inside comparator, in the output of comparator
End can generate a sucking electric current, which can drive the light emitting diode of optocoupler primary side side, so that it is shone, to make secondary side
Phototriode conducting, power fail warning signal is pulled down to 0V or so at this time, so when give the power fail warning of PON chip
Signal is low level, does not trigger alarm signal and reports；
And when the input voltage of the reference end of comparator is less than 2.5V, inside TL431, triode is not turned on, at this time comparator
Output end does not have electric current generation, can not drive the light emitting diode of optocoupler primary side side, therefore the phototriode on secondary side can not
Conducting, the power fail warning signal for giving PON chip at this time are raised, and trigger power fail warning signal reporting.
5. the method for power fail warning is realized in PON far end system as claimed in claim 4, it is characterised in that: the alarm
Voltage is 43V, and the charge threshold level that the ONU power module can not work is 38V.
6. a kind of circuit for realizing power fail warning in PON far end system, which is characterized in that the circuit includes:
Sequentially connected comparator, photoelectric conversion module and PON chip, the comparator are equipped with a bleeder circuit；
The comparator and the bleeder circuit are for monitoring ONU input voltage, when ONU input voltage is located at preset alarm
When below voltage, the photoelectric conversion module sends power fail warning signal to the PON chip；
The alarm voltage is the preset minimum voltage value for meeting ONU equipment normal work, and alarm voltage is slightly above the distal end PON
The charge threshold level that ONU power module can not work in system.
7. the circuit of power fail warning is realized in PON far end system as claimed in claim 6, which is characterized in that the partial pressure
Circuit includes:
First bleeder circuit, first bleeder circuit include first resistor, second resistance and first capacitor in parallel；
Second bleeder circuit, second bleeder circuit include concatenated 3rd resistor and the 4th resistance；
The input terminal connection ONU input voltage of first bleeder circuit, the input end grounding of second bleeder circuit,
The reference end of the output end of second bleeder circuit, the output end of first bleeder circuit and the comparator is connected to
Together.
8. the circuit of power fail warning is realized in PON far end system as claimed in claim 7, it is characterised in that:
The resistance value of the first resistor and the second resistance is 5.9K Ω, and the resistance value of the 3rd resistor is 3.6K Ω, institute
The resistance value for stating the 4th resistance is 44.2K Ω.
9. the circuit of power fail warning is realized in PON far end system as claimed in claim 8, it is characterised in that: when the ginseng
When examining the input voltage at end greater than 2.5V, the sucking current output terminal of the comparator is generated for driving the photoelectric conversion mould
Block sends the sucking electric current of signal to the PON chip.
10. the circuit of power fail warning is realized in PON far end system as claimed in claim 9, it is characterised in that: the alarm
Voltage is 43V, and the charge threshold level that the ONU power module can not work is 38V.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810514977.3A CN109031038A (en) | 2018-05-25 | 2018-05-25 | A kind of method and circuit for realizing power fail warning in PON far end system |
| PCT/CN2018/102944 WO2019223161A1 (en) | 2018-05-25 | 2018-08-29 | Method and circuit for realizing power failure warning in pon remote system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810514977.3A CN109031038A (en) | 2018-05-25 | 2018-05-25 | A kind of method and circuit for realizing power fail warning in PON far end system |
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| Publication Number | Publication Date |
|---|---|
| CN109031038A true CN109031038A (en) | 2018-12-18 |
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ID=64611504
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810514977.3A Pending CN109031038A (en) | 2018-05-25 | 2018-05-25 | A kind of method and circuit for realizing power fail warning in PON far end system |
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| Country | Link |
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| CN (1) | CN109031038A (en) |
| WO (1) | WO2019223161A1 (en) |
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| CN110456139A (en) * | 2019-08-19 | 2019-11-15 | 深圳市双翼科技股份有限公司 | A kind of power fail warning device of PON equipment |
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| WO2019223161A1 (en) | 2019-11-28 |
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