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
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- 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
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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 invention relates to the technical field of power failure alarm, in particular to a method and a circuit for realizing power failure alarm in a PON remote system.
Background
At present, a power-down warning function is added to a PON far-end system, and when the power supply of an ONU cannot meet the requirement of normal operation of the system, the system automatically sends a signal to a local-end OLT device (optical line terminal) so as to inform the OLT device that the ONU device may not operate normally, and the OLT device will make a corresponding response and record.
The traditional power failure alarm modes are mostly, a reset chip and a large number of electrolytic capacitors are adopted to realize the function, the existing DYING-GASP circuit for power failure alarm generally enables the threshold value to be set to be closer to the input voltage, so that the power failure holding time is ensured to be more than 4ms, the alarm message has sufficient time to be sent out, when the power grid fluctuates, the input voltage is easy to fall below the DYING-GASP threshold value, but is above the lowest voltage at which the system can normally work, and the system can report the DYNG-GASP but does not have power failure, namely false report. The risk of this implementation of generating a DYING-GASP false alarm is high, and a large amount of OTING-GASP electrolytic capacitors can cause a large power-on spike current.
Therefore, it is urgently needed to provide a power failure alarm mode with higher precision, so as to reduce the occurrence of false alarm of power failure alarm.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a circuit for realizing power failure alarm in a PON remote system.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method for realizing power failure alarm in a PON remote system comprises the following steps:
the comparator, the photoelectric conversion module and the PON chip are connected in sequence;
a voltage division circuit is arranged for the comparator;
monitoring the ONU input voltage by using the comparator and the voltage division circuit, and when the ONU input voltage is below a preset alarm voltage, sending a power failure alarm signal to the PON chip by using the photoelectric conversion module; wherein,
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and the alarm voltage is slightly higher than a voltage critical value at which the ONU power supply module in the PON far-end system can not work.
The invention utilizes the matching of the comparator and the photoelectric conversion module, the comparator is matched with the voltage division circuit and is used for monitoring the ONU input voltage, when the ONU input voltage is below the preset alarm voltage, the comparator generates an absorption current, so that the photoelectric conversion module sends a signal to the PON chip, and the PON chip can know that the ONU equipment can not work normally.
On the basis of the above technical solution, the step of providing the voltage dividing circuit specifically includes the steps of:
the method comprises the steps of establishing a first voltage division circuit, wherein the first voltage division circuit comprises a first resistor, a second resistor and a first capacitor which are connected in parallel;
building a second voltage division circuit, wherein the second voltage division circuit comprises a third resistor and a fourth resistor which are connected in series;
connecting the input end of the first voltage division circuit with the ONU input voltage, connecting the input end of the second voltage division circuit with the ground, and connecting the output end of the second voltage division circuit, the output end of the first voltage division circuit and the reference end of the comparator together.
On the basis of the above technical solution, when the system normally works, a monitoring level VR, that is, the voltage of the reference terminal of the comparator, is obtained through the voltage dividing circuit composed of the first resistor, the second resistor, the third resistor and the fourth resistor, and the calculation formula of VR is as follows: VR ═ v (VD-VI) (R1// R2)/(R1// R2+ R3+ R4);
wherein R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, VD is the ONU input voltage, and VI is the voltage output by the output terminal of the comparator;
in the formula, R1// R2 represents the resistance values of R1 and R2 which are connected in parallel, wherein R1 and R2 are 5.9K omega, R3 is 3.6K omega, R4 is 44.2K omega, and the three resistors are all precision resistors.
On the basis of the technical scheme, R1 and R2 are 5.9K omega, R3 is 3.6K omega, and R4 is 44.2K omega;
the comparator is a TL431 adjustable voltage stabilizing diode;
when the input voltage of the reference end of the comparator is more than 2.5V, the triode in the comparator is conducted, a suction current is generated at the output end of the comparator, the current can drive the light-emitting diode at the primary side of the optocoupler to enable the light-emitting diode to emit light, so that the phototriode at the secondary side is conducted, and at the moment, the power failure alarm signal is pulled down to about 0V, so that the power failure alarm signal sent to the PON chip is at a low level, and the alarm signal is not triggered to be reported;
and when the input voltage of the reference end of the comparator is less than 2.5V, the triode in the TL431 is not conducted, no current is generated at the output end of the comparator at the moment, and the output end of the comparator cannot drive the light-emitting diode at the primary side of the optocoupler, so that the phototriode at the secondary side cannot be conducted, and at the moment, the power failure alarm signal sent to the PON chip is pulled up to trigger the reporting of the power failure alarm signal.
On the basis of the technical scheme, the alarm voltage is 43V, and the voltage critical value at which the ONU power supply module cannot operate is 38V.
The invention also discloses a circuit for realizing power failure alarm in the PON far-end system, which comprises:
the device comprises a comparator, a photoelectric conversion module and a PON chip which are connected in sequence, wherein the comparator is provided with a voltage division circuit;
the comparator and the voltage division circuit are used for monitoring ONU input voltage, and when the ONU input voltage is below a preset alarm voltage, the photoelectric conversion module sends a power failure alarm signal to the PON chip;
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and the alarm voltage is slightly higher than a voltage critical value at which the ONU power supply module in the PON far-end system can not work.
On the basis of the above technical solution, the voltage dividing circuit includes:
the first voltage division circuit comprises a first resistor, a second resistor and a first capacitor which are connected in parallel;
the second voltage division circuit comprises a third resistor and a fourth resistor which are connected in series;
the input end of the first voltage division circuit is connected with the ONU input voltage, the input end of the second voltage division circuit is grounded, and the output end of the second voltage division circuit, the output end of the first voltage division circuit and the reference end of the comparator are connected together.
On the basis of the technical scheme, the resistance values of the first resistor and the second resistor are 5.9K omega, the resistance value of the third resistor is 3.6K omega, and the resistance value of the fourth resistor is 44.2K omega.
On the basis of the technical scheme, when the input voltage of the reference end is greater than 2.5V, the suction current output end of the comparator generates suction current for driving the photoelectric conversion module to send signals to the PON chip.
On the basis of the technical scheme, the alarm voltage is 43V, and the voltage critical value at which the ONU power supply module cannot operate is 38V.
Compared with the prior art, the invention has the advantages that:
(1) according to the invention, the comparator is matched with the photoelectric conversion module, when the ONU input voltage is below the preset alarm voltage, the comparator generates an absorption current, so that the photoelectric conversion module sends a signal to the PON chip, and the PON chip can know that the ONU equipment cannot work normally.
Drawings
Fig. 1 is a step diagram of a method for implementing a power failure alarm in a PON remote system in embodiment 1 of the present invention;
fig. 2 is a step diagram of a method for implementing a power failure alarm in a PON remote system in embodiment 2 of the present invention;
FIG. 3 is an internal structural diagram of a TL431 chip in embodiment 3 of the present invention;
fig. 4 is an internal structural view of a KPS2801 in embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a circuit for implementing a power down alarm in a PON remote system according to embodiment 4 of the present invention;
fig. 6 is a schematic structural diagram of a circuit for implementing a power down alarm in a PON remote system in embodiment 5 of the present invention;
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, embodiment 1 of the present invention provides a method for implementing a power failure alarm in a PON remote system, where the method includes the following steps:
s1, sequentially connecting the comparator, the photoelectric conversion module and the PON chip;
s2, providing a voltage divider circuit for the comparator;
s3, monitoring the ONU input voltage by using the comparator and the voltage division circuit, and sending a power failure warning signal to the PON chip by the photoelectric conversion module when the ONU input voltage is below a preset alarm voltage; wherein,
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and the alarm voltage is slightly higher than a voltage critical value at which the ONU power supply module in the PON far-end system cannot work.
The invention utilizes the matching of the comparator and the photoelectric conversion module, and the matching of the comparator and the voltage division circuit, and is used for monitoring the ONU input voltage, when the ONU input voltage is below the preset alarm voltage, the comparator generates an absorption current, so that the photoelectric conversion module sends a signal to the PON chip, and the PON chip can know that the ONU equipment can not work normally.
The setting of the alarm voltage can be selected according to the working requirement of the actual PON remote system and the equipment configuration, and along with the setting of the alarm voltage, the voltage dividing circuit and some electronic components in the circuit are also adjusted according to specific situations.
It should be noted that the comparator may use a TL431 adjustable zener diode, and the photoelectric conversion module may use a KPS2801 chip;
when the photoelectric conversion module is used, the ONU input voltage and the ground level of the PON chip are not shared and components necessary for signal conversion are needed;
the comparator is used for comparing the front voltage with the rear voltage to reach the early warning voltage and generate a warning signal.
It should be noted that the ONU power supply module is configured to supply power to the ONU device.
Example 2
Referring to fig. 2, an embodiment 2 of the present invention provides a method for implementing a power failure alarm in a PON remote system, where the method includes the following steps:
s1, sequentially connecting the comparator, the photoelectric conversion module and the PON chip;
s2, providing a voltage divider circuit for the comparator;
s3, monitoring the ONU input voltage by using the comparator and the voltage division circuit, and sending a power failure warning signal to the PON chip by the photoelectric conversion module when the ONU input voltage is below a preset alarm voltage; wherein,
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and is slightly higher than a voltage critical value at which an ONU power supply module in the PON far-end system cannot work;
the invention utilizes the matching of the comparator and the photoelectric conversion module, and the matching of the comparator and the voltage division circuit, and is used for monitoring the ONU input voltage, when the ONU input voltage is below the preset alarm voltage, the comparator generates an absorption current, so that the photoelectric conversion module sends a signal to the PON chip, and the PON chip can know that the ONU equipment can not work normally.
The setting of the alarm voltage can be selected according to the working requirement of the actual PON remote system and the equipment configuration, and along with the setting of the alarm voltage, the voltage dividing circuit and some electronic components in the circuit are also adjusted according to specific situations.
In this embodiment, the step of providing the voltage divider circuit, i.e., step S2, specifically includes the following steps:
s201, a first voltage division circuit is built, wherein the first voltage division circuit comprises a first resistor, a second resistor and a first capacitor which are connected in parallel;
s202, constructing a second voltage division circuit, wherein the second voltage division circuit comprises a third resistor and a fourth resistor which are connected in series;
and S203, connecting the input end of the first voltage division circuit with the ONU input voltage, connecting the input end of the second voltage division circuit with the ground, and connecting the output end of the second voltage division circuit, the output end of the first voltage division circuit and the reference end of the comparator together.
Example 3
The embodiment of the invention provides a method for realizing power failure alarm in a PON remote system, which comprises the following steps on the basis of the embodiment 2:
the resistance values of the first resistor and the second resistor are 5.9K omega, the resistance value of the third resistor is 3.6K omega, and the resistance value of the fourth resistor is 44.2K omega.
In this embodiment, the voltage at one end of the comparator may be set to 2.5V, when the input voltage at the reference end of the comparator is higher than 2.5V, the output end of the comparator may generate a suction current, and when the input voltage at the reference end of the comparator is lower than 2.5V, no current is generated at the output end of the comparator;
because the photoelectric conversion module uses a KPS2801 chip of COSMO, a primary side input signal is applied to a primary side light emitting diode and a resistor to generate an input current If of the photoelectric conversion module, and If drives the light emitting diode, so that a phototriode on a secondary side is conducted to generate Ic and further generate Vout, and the purpose of transmitting signals is achieved;
the direct drive relationship of the primary side and the secondary side is CTR (current transfer ratio), and Ic < ═ If × CTR is satisfied.
In this embodiment, the comparator is a TL431 chip, the photoelectric conversion module is a KPS2801, the internal structure diagrams of the TL431 chip and the KPS2801 are shown in fig. 3 and 4, the preprocessed ONU input voltage is connected to the anode of the comparator, and a monitoring level VR is sent to the reference terminal of the comparator through the voltage dividing circuit, the output terminal of the comparator is connected to the cathode of the primary light emitting diode of the photoelectric conversion module, and the anode of the light emitting diode is connected to the analog ground of the power supply terminal, that is, 0V;
the output level of the collector electrode of the phototriode on the secondary side of the photoelectric conversion module is sent to the PON chip as a power failure alarm signal, meanwhile, a pull-up resistor is externally connected to 3.3V, when the signal is at a high level, the PON chip can report a power failure alarm message to an OLT through an OMCI (optical network unit management control interface) channel, and the emitter on the secondary side of the photoelectric conversion module is connected with a digital ground.
When the system works normally, the ONU input voltage is 48V, and after passing through a voltage division circuit consisting of a first resistor, a second resistor, a third resistor and a fourth resistor, a monitoring level VR can be obtained, wherein the calculation formula of VR is as follows: VR ═ v (VD-VI) (R1// R2)/(R1// R2+ R3+ R4);
wherein R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, VD is the ONU input voltage, and VI is the voltage output by the output terminal of the comparator;
in the formula, R1// R2 represents the resistance values of R1 and R2 which are connected in parallel, wherein R1 and R2 are 5.9K omega, R3 is 3.6K omega, R4 is 44.2K omega, and three resistors all use precision resistors;
according to the formula calculation, when VD is 48V, VR is 2.79V, the input voltage of the reference end of the comparator is larger than 2.5V, the triode in the TL431 is conducted, a suction current can be generated at the output end of the comparator, the current can drive the light emitting diode at the primary side of the optocoupler to enable the light emitting diode to emit light, so that the phototriode at the secondary side is conducted, the power failure alarm signal is pulled down to about 0V, and therefore the power failure alarm signal sent to the PON chip is at a low level and does not trigger alarm signal reporting;
when the input voltage of the reference end of the comparator is less than 2.5V, the triode in the TL431 is not conducted, no current is generated at the output end of the comparator at the moment, and the light-emitting diode at the primary side of the optocoupler cannot be driven, so that the phototriode at the secondary side cannot be conducted, and at the moment, the power failure alarm signal sent to the PON chip is pulled up to trigger the reporting of the power failure alarm signal;
therefore, with 2.5V as a critical point, the trigger level of the power-down alarm can be calculated to be 43.01V by the formula, that is, when the input voltage of the ONU drops to 43V, the power-down alarm signal is triggered to report;
since the threshold voltage value is only slightly higher than the voltage value at which the ONU power supply module cannot operate, i.e. 38V, the risk of false alarm of the OTING-GASP is greatly reduced.
In this embodiment, when the input voltage of the reference terminal is greater than 2.5V, the sink current output terminal of the comparator generates a sink current for driving the photoelectric conversion module to send a signal to the PON chip.
In this embodiment, the alarm voltage is 43V, the threshold voltage value of the voltage at which the ONU power supply module cannot operate is 38V, and the ONU power supply module cannot operate due to the voltage below 38V.
Example 4
Referring to fig. 5, an embodiment of the present invention provides a circuit for implementing a power down alarm in a PON remote system, where the circuit includes:
the device comprises a comparator, a photoelectric conversion module and a PON chip which are connected in sequence, wherein the comparator is provided with a voltage division circuit;
the comparator and the voltage division circuit are used for monitoring the ONU input voltage, and when the ONU input voltage is below a preset alarm voltage, the photoelectric conversion module sends a power failure alarm signal to the PON chip;
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and is slightly higher than the voltage at which an ONU power module in the PON far-end system cannot work;
the invention utilizes the matching of the comparator and the photoelectric conversion module, and the matching of the comparator and the voltage division circuit, and is used for monitoring the ONU input voltage, when the ONU input voltage is below the preset alarm voltage, the comparator generates an absorption current, so that the photoelectric conversion module sends a signal to the PON chip, and the PON chip can know that the ONU equipment can not work normally.
The setting of the alarm voltage can be selected according to the working requirement of the actual PON remote system and the equipment configuration, and along with the setting of the alarm voltage, the voltage dividing circuit and some electronic components in the circuit are also adjusted according to specific situations.
It should be noted that the comparator may use a TL431 chip, and the photoelectric conversion module may use a KPS2801 chip.
Example 5
Referring to fig. 6, an embodiment of the present invention provides a circuit for implementing a power down alarm in a PON remote system, where the circuit includes:
the device comprises a comparator, a photoelectric conversion module and a PON chip which are connected in sequence, wherein the comparator is provided with a voltage division circuit;
the comparator and the voltage division circuit are used for monitoring the ONU input voltage, and when the ONU input voltage is below a preset alarm voltage, the photoelectric conversion module sends a power failure alarm signal to the PON chip;
the alarm voltage is slightly higher than the voltage critical value that the ONU power supply module in the PON far-end system can not work.
The invention utilizes the matching of the comparator and the photoelectric conversion module, and the matching of the comparator and the voltage division circuit, and is used for monitoring the ONU input voltage, when the ONU input voltage is below the preset alarm voltage, the comparator generates an absorption current, so that the photoelectric conversion module sends a signal to the PON chip, and the PON chip can know that the ONU equipment can not work normally.
The setting of the alarm voltage can be selected according to the working requirement of the actual PON remote system and the equipment configuration, and along with the setting of the alarm voltage, the voltage dividing circuit and some electronic components in the circuit are also adjusted according to specific situations.
In this embodiment, the voltage divider circuit includes:
the first voltage division circuit comprises a first resistor, a second resistor and a first capacitor which are connected in parallel;
the second voltage division circuit comprises a third resistor and a fourth resistor which are connected in series;
the input end of the first voltage division circuit is connected with the ONU input voltage, the input end of the second voltage division circuit is grounded, and the output end of the second voltage division circuit, the output end of the first voltage division circuit and the reference end of the comparator are connected together.
It should be noted that, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, R5 is a fifth resistor, R6 is a sixth resistor, R7 is a seventh resistor, R4 is a fourth resistor, C1 and C2 are a first capacitor and a second capacitor, respectively, and DYING-GASP is used to indicate that the line is used to send signals to the PON chip, thereby performing a power-down alarm;
in addition, the resistance value of the resistor and the capacitance of the capacitor can be set according to requirements;
it should be noted that C2 is used to prevent interference and voltage jitter, and R6 is connected to the operating level of the digital-to-GASP, i.e. maintains a fixed level, and when the line where R7 is located needs to be used to send signals to the PON chip, because the end of R6 maintains a fixed level and is the same as the operating level of the digital-to-GASP, it can be ensured that the power-down alarm can be performed normally, and R7 only plays a role of ordinary series resistance.
Example 6
The embodiment of the invention provides a circuit for realizing power failure alarm in a PON far-end system, which is based on the embodiment 5:
the resistance values of the first resistor and the second resistor are 5.9K omega, the resistance value of the third resistor is 3.6K omega, and the resistance value of the fourth resistor is 44.2K omega.
In this embodiment, the voltage at one end of the comparator may be set to 2.5V, when the input voltage at the reference end of the comparator is higher than 2.5V, the output end of the comparator may generate a suction current, and when the input voltage at the reference end of the comparator is lower than 2.5V, no current is generated at the output end of the comparator;
because the photoelectric conversion module uses a KPS2801 chip of COSMO, a primary side input signal is applied to a primary side light emitting diode and a resistor to generate input current If of an optical coupler, and If drives the light emitting diode, so that a phototriode on a secondary side is conducted to generate Ic and further generate Vout, and the purpose of transmitting signals is achieved;
the direct drive relationship of the primary side and the secondary side is CTR (current transfer ratio), and Ic < ═ If × CTR is satisfied.
In this embodiment, the comparator is a TL431 chip, the photoelectric conversion module is a KPS2801, the preprocessed ONU input voltage is connected to the anode of the comparator, and a monitoring level VR is sent to the reference terminal of the comparator through the voltage divider circuit, the output terminal of the comparator is connected to the cathode of the primary light emitting diode of the photoelectric conversion module, and the anode of the light emitting diode is connected to the analog ground of the power supply terminal, that is, 0V;
the output level of the collector electrode of the phototriode on the secondary side of the photoelectric conversion module is sent to the PON chip as a power failure alarm signal, meanwhile, a pull-up resistor is externally connected to 3.3V, when the signal is at a high level, the PON chip can report a power failure alarm message to an OLT through an OMCI (optical network unit management control interface) channel, and the emitter on the secondary side of the photoelectric conversion module is connected with a digital ground.
When the system works normally, the ONU input voltage is 48V, and after passing through a voltage division circuit consisting of a first resistor, a second resistor, a third resistor and a fourth resistor, a monitoring level VR can be obtained, wherein the calculation formula of VR is as follows: VR ═ v (VD-VI) (R1// R2)/(R1// R2+ R3+ R4);
wherein R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, VD is the ONU input voltage, and VI is the voltage output by the output terminal of the comparator;
in the formula, R1// R2 represents a resistor formed by connecting R1 and R2 in parallel, wherein R1 and R2 are 5.9K omega, R3 is 3.6K omega, R4 is 44.2K omega, and the three resistors are all precision resistors;
according to formula calculation, when VD is 48V, VR is 2.79V, the input voltage of the reference end of the comparator is larger than 2.5V, the triode in the TL431 is conducted, a suction current can be generated at the output end of the comparator, the current can drive the light-emitting diode at the primary side of the optocoupler to enable the light-emitting diode to emit light, so that the phototriode at the secondary side is conducted, the power failure alarm signal is pulled down to about 0V, therefore, the power failure alarm signal sent to the PON chip is at a low level, and the alarm signal is not triggered to be reported;
when the input voltage of the reference end of the comparator is less than 2.5V, the triode in the TL431 is not conducted, no current is generated at the output end of the comparator at the moment, and the light-emitting diode at the primary side of the optocoupler cannot be driven, so that the phototriode at the secondary side cannot be conducted, and at the moment, the power failure alarm signal sent to the PON chip is pulled up to trigger the reporting of the power failure alarm signal;
therefore, with 2.5V as a critical point, the trigger level of the power-down alarm can be calculated to be 43.01V by the formula, that is, when the input voltage of the ONU drops to 43V, the power-down alarm signal is triggered to report;
since the threshold voltage value is only slightly higher than the voltage value at which the ONU power supply module cannot operate, i.e. 38V, the risk of false alarm of the OTING-GASP is greatly reduced.
In this embodiment, when the input voltage of the reference terminal is greater than 2.5V, the sink current output terminal of the comparator generates a sink current for driving the photoelectric conversion module to send a signal to the PON chip.
In this embodiment, the alarm voltage is 43V, the threshold voltage value of the voltage at which the ONU power supply module cannot operate is 38V, and the ONU power supply module cannot operate due to the voltage below 38V.
As shown in fig. 6, 0V on the left side of R5 and 0V on the right side of R4 both represent ground.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone with the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, are within the protection scope.
Claims (10)
1. A method for realizing power failure alarm in a PON remote system is characterized by comprising the following steps:
the comparator, the photoelectric conversion module and the PON chip are connected in sequence;
a voltage division circuit is arranged for the comparator;
monitoring the ONU input voltage by using the comparator and the voltage division circuit, and when the ONU input voltage is below a preset alarm voltage, sending a power failure alarm signal to the PON chip by using the photoelectric conversion module; wherein,
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and the alarm voltage is slightly higher than a voltage critical value at which the ONU power supply module in the PON far-end system can not work.
2. The method of claim 1, wherein the step of configuring the voltage divider circuit specifically comprises the steps of:
the method comprises the steps of establishing a first voltage division circuit, wherein the first voltage division circuit comprises a first resistor, a second resistor and a first capacitor which are connected in parallel;
building a second voltage division circuit, wherein the second voltage division circuit comprises a third resistor and a fourth resistor which are connected in series;
connecting the input end of the first voltage division circuit with the ONU input voltage, connecting the input end of the second voltage division circuit with the ground, and connecting the output end of the second voltage division circuit, the output end of the first voltage division circuit and the reference end of the comparator together.
3. The method for implementing power down alarm in PON remote system according to claim 2, wherein:
when the system works normally, a monitoring level VR is obtained after passing through a voltage division circuit consisting of a first resistor, a second resistor, a third resistor and a fourth resistor, and the calculation formula of VR is as follows: VR ═ v (VD-VI) (R1// R2)/(R1// R2+ R3+ R4);
wherein R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, VD is the ONU input voltage, and VI is the voltage output by the output terminal of the comparator;
in the formula, R1// R2 represents the resistance values of R1 and R2 which are connected in parallel, wherein R1 and R2 are 5.9K omega, R3 is 3.6K omega, R4 is 44.2K omega, and the three resistors are all precision resistors.
4. The method for implementing power down alarm in PON remote system according to claim 3, wherein: r1 and R2 were 5.9K Ω, R3 was 3.6K Ω, and R4 was 44.2K Ω;
the comparator adopts a TL431 chip;
when the input voltage of the reference end of the comparator is more than 2.5V, the triode in the comparator is conducted, a suction current is generated at the output end of the comparator, the current can drive the light-emitting diode at the primary side of the optocoupler to enable the light-emitting diode to emit light, so that the phototriode at the secondary side is conducted, and at the moment, the power failure alarm signal is pulled down to about 0V, so that the power failure alarm signal sent to the PON chip is at a low level, and the alarm signal is not triggered to be reported;
and when the input voltage of the reference end of the comparator is less than 2.5V, the triode in the TL431 is not conducted, no current is generated at the output end of the comparator at the moment, and the output end of the comparator cannot drive the light-emitting diode at the primary side of the optocoupler, so that the phototriode at the secondary side cannot be conducted, and at the moment, the power failure alarm signal sent to the PON chip is pulled up to trigger the reporting of the power failure alarm signal.
5. The method for implementing power down alarm in PON remote system according to claim 4, wherein: the alarm voltage is 43V, and the voltage critical value that the ONU power supply module cannot operate is 38V.
6. A circuit for implementing a power down alarm in a PON remote system, the circuit comprising:
the device comprises a comparator, a photoelectric conversion module and a PON chip which are connected in sequence, wherein the comparator is provided with a voltage division circuit;
the comparator and the voltage division circuit are used for monitoring ONU input voltage, and when the ONU input voltage is below a preset alarm voltage, the photoelectric conversion module sends a power failure alarm signal to the PON chip;
the alarm voltage is a preset minimum voltage value which meets the normal work of the ONU equipment, and the alarm voltage is slightly higher than a voltage critical value at which the ONU power supply module in the PON far-end system can not work.
7. The circuit for implementing a power down alarm in a PON remote system as claimed in claim 6, wherein the voltage divider circuit comprises:
the first voltage division circuit comprises a first resistor, a second resistor and a first capacitor which are connected in parallel;
the second voltage division circuit comprises a third resistor and a fourth resistor which are connected in series;
the input end of the first voltage division circuit is connected with the ONU input voltage, the input end of the second voltage division circuit is grounded, and the output end of the second voltage division circuit, the output end of the first voltage division circuit and the reference end of the comparator are connected together.
8. The circuit for implementing a power down alarm in a PON remote system as claimed in claim 7, wherein:
the resistance values of the first resistor and the second resistor are 5.9K omega, the resistance value of the third resistor is 3.6K omega, and the resistance value of the fourth resistor is 44.2K omega.
9. The circuit for implementing a power down alarm in a PON remote system as claimed in claim 8, wherein: and when the input voltage of the reference end is greater than 2.5V, the suction current output end of the comparator generates suction current for driving the photoelectric conversion module to send signals to the PON chip.
10. The circuit for implementing a power down alarm in a PON remote system as claimed in claim 9, wherein: the alarm voltage is 43V, and the voltage critical value that the ONU power supply module cannot operate 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN109031038A true CN109031038A (en) | 2018-12-18 |
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| 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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| WO2019223161A1 (en) | 2019-11-28 |
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