CN113922484A - System and method for reporting power failure of Wi-SUN network - Google Patents
System and method for reporting power failure of Wi-SUN network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a system and a method for reporting power failure of a Wi-SUN network, which comprise an external power supply module, a voltage monitoring module for detecting the voltage state of the external power supply, a Wi-SUN communication module, a charging control module, an energy storage module, a discharging control module, a boosting module and a method for reporting power failure of the Wi-SUN network. The external power supply module supplies power to the Wi-SUN communication module, the energy storage module can be charged through the charging control module, when the voltage monitoring module detects that the voltage value of the external power supply falls to a set threshold value, a power failure event is triggered, current data are reported to the background control center through the Wi-SUN network, the charging control module closes a charging circuit of the energy storage module, the energy storage module supplies power to the Wi-SUN communication module after boosting through the discharging control module and the boosting module, product cost can be effectively saved, influences of product size on the system are reduced, and the requirement that a large-data-volume message uploading task can be achieved after the external power supply of the Wi-SUN communication equipment is powered down is met.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a system and a method for reporting power failure of a Wi-SUN network.
Background
Wi-SUN is a networking technology defined from a physical layer to a transport layer, and in recent years, based on advanced networking and self-repairing technology, strong security encryption mechanism, 802.15.4 and other standard standards, it is continuously widely used in various fields, for example: electricity meter, photovoltaic energy, smart cities, and the like. In many Wi-SUN technical applications, the device is required to have a power failure reporting function in many scenes, and the explanation is as follows: when the external power supply of the equipment fails and loses power, continuous power supply needs to be realized through an additional circuit, and the task of reporting current data and power failure events to the background control center is completed.
Some power failure reporting schemes have been implemented in some network communication technologies. Most of the realized methods also adopt charging of a super capacitor as a standby power supply, and when an external power supply fails due to a fault, the standby power supply is started to continuously supply power for a period of time to realize data reporting. However, this method has certain disadvantages: in order to reduce the design difficulty, most of schemes adopt a super capacitor voltage reduction mode to provide a standby power supply, so that the discharge voltage of the super capacitor cannot reach a low enough level, the internal charge energy of the super capacitor cannot be utilized more efficiently, the duration of the standby power supply is further influenced, and the application scene requirements reported by a large amount of data cannot be met; the design of a driving circuit and a voltage detection circuit of the standby power supply is too complex, the flexibility is not enough under the condition that the actual circuit debugging and the product volume are limited, and the limitation on the actual application of the scheme is large.
For example, chinese patent CN106297241B, published 2019, 8, 20, an intelligent electric energy meter GPRS power down reporting system includes a main circuit power supply and an auxiliary circuit power supply, the main circuit power supply is connected to a switch module, an MCU unit and an optical coupler are connected to a circuit of the main circuit power supply and the switch module, the auxiliary circuit power supply is connected to a charging module, the charging module is connected to a diode first and then to an energy storage module, the energy storage module is connected to a diode first and then to the switch module, the auxiliary circuit power supply is connected to a diode first and then to the switch module, the switch module is connected to a diode first and then to a GPRS module, and the GPRS module is connected to the optical coupler. The GPRS power-down reporting function is realized through the cooperation of a hardware circuit and a software algorithm. However, the power failure reporting circuit is too complex and is easily influenced by the product volume factor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the prior power failure reporting system has the technical problem of poor universality caused by too complex composition circuit and easy product volume limitation. The system and the method for reporting the power failure of the Wi-SUN network are not easily influenced by the product size and have strong universality.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a system that is used for Wi-SUN network to fall power and reports, includes external power source module, is used for detecting external power source voltage state's voltage monitoring module, Wi-SUN communication module, the control module that charges, energy storage module, discharge control module and the module of stepping up, voltage monitoring module respectively with external power source module with Wi-SUN communication module connects, external power source module respectively with Wi-SUN communication module with the control module that charges is connected, charge control module loops through energy storage module with discharge control module with the module of stepping up is connected, the module of stepping up with Wi-SUN communication module connects. A system for reporting power failure of a Wi-SUN network is characterized in that an external power supply module supplies power to a Wi-SUN communication module, an energy storage module can be charged through a charging control module, when a voltage monitoring module detects that the voltage value of the external power supply falls to a set threshold value, a power failure event is triggered, current data are reported to a background control center through the Wi-SUN network, a charging circuit of the energy storage module is closed through the charging control module, the energy storage module supplies power to the Wi-SUN communication module after being boosted through the discharging control module and a boosting module, and after communication equipment in the Wi-SUN network is powered down, an effective self-starting power failure management circuit continuously provides a working power supply for the Wi-SUN module by using a standby power supply, and reporting of the power failure event and related data is completed.
Preferably, the boost module comprises a boost circuit, the boost circuit comprises a chip U1, an LX terminal of the chip U1 is connected with the energy storage and charging terminal through an inductor L1, an IN terminal of the chip U1 is connected with one terminal of a capacitor C4 and a voltage input terminal respectively, the other terminal of the capacitor C4 is grounded, an EN terminal of the chip U1 is connected with one terminal of a resistor R17 and a collector of a transistor Q3 respectively, one terminal of a resistor R17 is connected with the voltage input terminal, an emitter of the transistor Q3 is grounded, a base of the transistor Q3 is connected with one terminal of a resistor R21 and one terminal of a resistor R22 respectively, the other terminal of the resistor R21 is connected with the external power output terminal, the other terminal of the resistor R22 is grounded, a GND terminal of the chip U1 is grounded, an FB terminal of the chip U1 is connected with one terminal of a resistor R12 and one terminal of a resistor 15 respectively, the other terminal of the resistor R12 is grounded, the other terminal of the resistor R12 is connected with an OUT terminal of the chip U82 1 and one terminal of the capacitor C8653, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, the OUT terminal of the chip U1 is connected with the anode of the voltage reference chip D2, and the cathode of the voltage reference chip D2 is connected with the voltage input terminal.
The IN end of the chip U1 is connected with one end of a capacitor C4 and a voltage input end, namely the f end, respectively, the negative electrode of a voltage reference chip D2 is connected with the voltage input end, namely the g end, and the output end of a voltage reduction unit, namely the C end, are connected with a charging port of the Wi-SUN communication module, and the voltage reference chip is used for replacing the C end with the g end to supply power for the Wi-SUN communication module when power failure occurs.
The boost DC/DC chip U1 selected here can be SY7072 chip, and its biggest characteristic is that when the low voltage is less than 2V input, its biggest output current can still meet 800mA (the current is about 700mA when the Wi-SUN module emits at maximum power 30 dBm). Therefore, the discharge efficiency of the front-end super capacitor is high, and the requirement of the standby power supply for a long time after power failure can be met. When the external power supply VCC _12 is supplying power normally, the transistor Q3 is turned off, and the U1 stops working because the enable pin is pulled down; when VCC _12 is powered down, the transistor Q3 is disconnected, the U1 starts to work because the enable pin is pulled high, and at the moment, the Wi-SUN module power supply is obtained by discharging through the super capacitor and boosting. D2 is used for preventing VCC-5 power from flowing back to the DC/DC front end when the external power supply supplies power, and plays a role in isolation.
Preferably, the protection device further comprises a protection module, the protection module is connected with the energy storage module, the protection module comprises a protection circuit, the protection circuit comprises a resistor R10, a resistor R11, a resistor R14, a resistor R18, a resistor R19, a resistor R20, a voltage reference chip D3, a voltage reference chip D4, a capacitor C3 and a capacitor C5, one end of the resistor R10 is connected with the energy storage charging end and one end of the resistor R11, the other end of the resistor R11 is connected with the negative electrode of the voltage reference chip D3, the other end of the resistor R10 is connected with the control end of the voltage reference chip D3 and one end of the resistor R14, the other end of the resistor R14 is connected with the negative electrode of the capacitor C3 and the positive electrode of the voltage reference chip D3, and the positive electrode of the capacitor C3 is connected with the energy storage charging end; one end of a resistor R18 is connected with the anode of a capacitor C5 and one end of a resistor R19 respectively, the other end of the resistor R19 is connected with the cathode of a voltage reference chip D4, the other end of a resistor R18 is connected with the control end of a voltage reference chip D4 and one end of a resistor R20 respectively, the other end of the resistor R20 is connected with the cathode of a capacitor C5 and the anode of a voltage reference chip D4 respectively, the anode of a capacitor C5 is connected with the cathode of a capacitor C3, and the cathode of a capacitor C5 is grounded.
The voltage reference chips D3 and D4 may be TL431 chips, where the a terminal is an anode, the K terminal is a cathode, the VREF terminal is a control terminal, that is, the control terminal is a third connection port of the voltage reference chip except the anode and the cathode, the capacitor C3 and the capacitor C5 may be super capacitors that the energy storage module needs to be protected, and the anode of the capacitor C3 is connected to the energy storage charging terminal, that is, the D terminal. The mode of connecting two 25F/2.7V super capacitors in series is adopted, the requirement of 5V charging voltage can be met, and the design of the energy storage power supply is simplified. Because the capacitance value precision of the super capacitor is generally high, if no special treatment is carried out, the condition that the two capacitors are unbalanced in charging is easy to occur, and the super capacitor can be damaged in serious cases. D3 and D4 are voltage reference chips and form a capacitance protection circuit together with a resistor. Taking the capacitor C3 as an example, when the voltage across the capacitor exceeds 2.7V, the voltage value obtained by dividing the voltage by the resistors R10 and R14 exceeds the reference voltage of D3, and the D3 will increase its reverse current to release the charge energy on C3 until the voltage value across the capacitor is less than 2.7V; the same principle is applied to the protection process of the capacitor C5.
Preferably, the voltage monitoring module comprises a voltage monitoring circuit, the voltage monitoring circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with the external power connection end, the other end of the resistor R1 is respectively connected with the comparator input end and one end of the resistor R2, and the other end of the resistor R2 is grounded.
The voltage monitoring circuit is used for monitoring the power state of an external power supply constantly, one end of the resistor R1 is connected with the external power supply connection end, namely the end a, the other end of the resistor R1 is connected with the resistor R2 and the input end of the comparator, namely the end b, the other end of the resistor R2 is grounded, when the voltage value drops to a set threshold value, the voltage collected by the input I/O end, namely the end b, of the comparator of the Wi-SUN communication module is lower than the voltage of an internal reference source, and at the moment, a power failure event is triggered and simultaneously current data are reported to the background control center through the Wi-SUN network.
The monitoring circuit samples the external power supply voltage in a resistance voltage division mode, the obtained voltage value is compared with the reference threshold value of the internal comparator of the Wi-SUN module, and the values of the resistors R1 and R2 can be actually selected according to the external power supply voltage and the threshold value of the comparator.
Preferably, the charging control module comprises a charging control circuit, the charging control circuit comprises a current-limiting resistor R3, a current-limiting resistor R4, a current-limiting resistor R5, a current-limiting resistor R6, a transistor Q1, a transistor Q2, a resistor R7, a resistor R8 and a resistor R13, the current-limiting resistor R3, the current-limiting resistor R4, the current-limiting resistor R5 and the current-limiting resistor R6 are sequentially connected in parallel to form a current-limiting resistor parallel circuit, the current-limiting resistor parallel circuit is connected with the source of the transistor Q1, the drain of the transistor Q1 is connected with the energy storage charging terminal, the gate of the transistor Q1 is connected with the collectors of the resistor R7 and the transistor Q2, the base of the transistor Q2 is connected with the resistor R8 and the resistor R13, and the emitter of the transistor Q2 is grounded.
One end of the current-limiting resistor parallel circuit is connected with the source of the transistor Q1, the other end of the current-limiting resistor parallel circuit is connected with the c end, namely the output end of the voltage-reducing unit, at the moment, the c end voltage is VCC _5, namely the working voltage of the Wi-SUN module, the drain of the transistor Q1 is connected with the energy storage charging end, namely the d end, the charging voltage VCC _ CAP of the energy storage charging end, the grid of the transistor Q1 is connected with the collectors of the resistor R7 and the transistor Q2 respectively, the other end of the resistor R7 is connected with the c end, the base of the transistor Q2 is connected with the resistor R8 and the resistor R13 respectively, the other end of the resistor R8 is connected with the output end of an external power supply, namely the e end, and the emitter of the transistor Q2 and the other end of the electrode resistor R13 are grounded. The function of the charge control circuit is to charge the super capacitor. When the voltage value is normal, the transistor Q2 is turned on, the gate of the transistor Q1 is at a low level, so that the Q1 is turned on, at the moment, the voltage VCC _5 (namely the working voltage of the Wi-SUN module) starts to provide a charging voltage VCC _ CAP for the super capacitor at the rear end, and the resistors R3-R6 form a current-limiting resistor parallel circuit, so that the transistor Q1 is prevented from being burnt by too high current at the initial charging moment and the stability of the power supply VCC _5 is prevented from being influenced by too large load.
Preferably, the energy storage module comprises a plurality of supercapacitors. The super capacitor has the advantages of high efficiency, quick charge and discharge, long-term floating charge and the like.
Preferably, the external power module includes an external power supply unit and a voltage reduction unit, and the external power supply unit is connected to the Wi-SUN communication module through the voltage reduction unit. The working voltage VCC of the Wi-SUN communication module is generally DC5V, and when the adopted external power supply voltage, namely the power supply voltage of the external power supply unit, is higher than the working voltage of the Wi-SUN communication module, a voltage reduction DC/DC transformer, namely a voltage reduction unit, outputs 5V to provide a normal working power supply for the Wi-SUN module.
A method for reporting power failure of a Wi-SUN network utilizes any one of the systems, and comprises the following steps:
s1: the voltage monitoring module detects that the power supply voltage of the external power supply module is lower than a threshold value;
s2: the voltage monitoring module sends a data reporting instruction to the Wi-SUN communication module through the input end of the comparator;
s3: the charging control module closes a charging channel of the energy storage module;
s4: the energy storage module supplies power to the Wi-SUN communication module through the discharge control module and the boosting module;
s5: and the Wi-SUN communication module reports the current data to the background control center. By the method, after the communication equipment in the Wi-SUN network is powered off, the power-off management circuit is effectively and automatically started, and the standby power supply is used for continuously providing a working power supply for the Wi-SUN module, so that the Wi-SUN module can finish the reporting of the power-off event and related data.
The substantial effects of the invention are as follows: the external power supply module of the invention supplies power to the Wi-SUN communication module, and can also charge the energy storage module through the charging control module, when the voltage monitoring module detects that the voltage value of the external power supply falls to a set threshold value, a power-down event is triggered, the current data is reported to a background control center through a Wi-SUN network, a charging control module closes a charging circuit of an energy storage module, the energy storage module supplies power to a Wi-SUN communication module after boosting through a boosting module and a discharging control module, and after communication equipment in the Wi-SUN network is powered off, the effective self-starting power-down management circuit utilizes the standby power supply to continuously provide a working power supply for the Wi-SUN module, can effectively save the product cost, reduce the influence of the product volume on the system, and can realize the message uploading task of large data volume after the external power supply of the Wi-SUN communication equipment is powered down.
Drawings
FIG. 1 is a schematic composition diagram of the present embodiment;
FIG. 2 is a circuit diagram of a voltage monitoring circuit according to the present embodiment;
FIG. 3 is a circuit diagram of a charge control circuit according to the present embodiment;
FIG. 4 is a circuit diagram of the protection circuit of the present embodiment;
FIG. 5 is a circuit diagram of the boosting circuit of the present embodiment;
FIG. 6 is a flowchart illustrating steps performed in this embodiment.
Wherein: 1. the device comprises an external power supply module, 2, a voltage monitoring module, 3, a Wi-SUN communication module, 4, a charging control module, 5, an energy storage module, 6, a discharging control module, 7, a boosting module, 8, an external power supply unit, 9, a voltage reduction unit, 10 and a protection module.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The utility model provides a system for Wi-SUN network falls electric and reports, as shown in figure 1, including external power supply module 1, a voltage monitoring module 2 for detecting external power supply voltage state, Wi-SUN communication module 3, charging control module 4, energy storage module 5, discharging control module 6 and boost module 7, voltage monitoring module 2 is connected with external power supply module 1 and Wi-SUN communication module 3 respectively, external power supply module 1 is connected with Wi-SUN communication module 3 and charging control module 4 respectively, external power supply module 1 includes external power supply unit 8 and voltage step-down unit 9, external power supply unit 8 is connected with Wi-SUN communication module 3 through voltage step-down unit 9. The operating voltage VCC of the Wi-SUN communication module is generally DC5V, and when the external power supply voltage adopted, i.e., the power supply voltage of the external power supply unit 8, is higher than the operating voltage of the Wi-SUN communication module, a step-down DC/DC transformer, i.e., the step-down unit 9, outputs 5V to provide a normal operating power supply for the Wi-SUN module. The charging control module 4 is connected with the boosting module 7 sequentially through the energy storage module 5 and the discharging control module 6, and the energy storage module 5 comprises a plurality of super capacitors. The super capacitor has the advantages of high efficiency, quick charge and discharge, long-term floating charge and the like. The boost module 7 is connected with the Wi-SUN communication module 3.
The voltage monitoring module 2 includes a voltage monitoring circuit, as shown in fig. 2, the voltage monitoring circuit includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to the external power connection terminal, the other end of the resistor R1 is connected to the comparator input terminal and one end of the resistor R2, and the other end of the resistor R2 is grounded.
The voltage monitoring circuit is used for monitoring the power state of an external power supply constantly, one end of the resistor R1 is connected with the external power supply connection end, namely the end a, the other end of the resistor R1 is connected with the resistor R2 and the input end of the comparator, namely the end b, the other end of the resistor R2 is grounded, when the voltage value drops to a set threshold value, the voltage collected by the input I/O end, namely the end b, of the comparator of the Wi-SUN communication module is lower than the voltage of an internal reference source, and at the moment, a power failure event is triggered and simultaneously current data are reported to the background control center through the Wi-SUN network. The monitoring circuit samples the external power supply voltage in a resistance voltage division mode, the obtained voltage value is compared with the reference threshold value of the internal comparator of the Wi-SUN module, and the values of the resistors R1 and R2 can be actually selected according to the external power supply voltage and the threshold value of the comparator.
The charging control module 4 includes a charging control circuit, as shown in fig. 3, the charging control circuit includes a current-limiting resistor R3, a current-limiting resistor R4, a current-limiting resistor R5, a current-limiting resistor R6, a transistor Q1, a transistor Q2, a resistor R7, a resistor R8, a resistor R13, a current-limiting resistor R3, a current-limiting resistor R4, a current-limiting resistor R5, and a current-limiting resistor R6, which are sequentially connected in parallel to form a current-limiting resistor parallel circuit, the current-limiting resistor parallel circuit is connected to the source of the transistor Q1, the drain of the transistor Q1 is connected to the energy storage charging terminal, the gate of the transistor Q1 is connected to the collectors of the resistor R7 and the transistor Q2, the base of the transistor Q2 is connected to the resistor R8 and the resistor R13, and the emitter of the transistor Q2 is grounded.
One end of the current-limiting resistor parallel circuit is connected with the source of the transistor Q1, the other end of the current-limiting resistor parallel circuit is connected with the c end, namely the output end of the voltage-reducing unit 9, at the moment, the c end voltage is VCC _5, namely the working voltage of the Wi-SUN module, the drain of the transistor Q1 is connected with the energy storage charging end, namely the d end, the charging voltage VCC _ CAP of the energy storage charging end, the grid of the transistor Q1 is connected with the collectors of the resistor R7 and the transistor Q2 respectively, the other end of the resistor R7 is connected with the c end, the base of the transistor Q2 is connected with the resistor R8 and the resistor R13 respectively, the other end of the resistor R8 is connected with the output end of an external power supply, namely the e end, and the emitter of the transistor Q2 and the other end of the electrode resistor R13 are grounded. The function of the charge control circuit is to charge the super capacitor. When the voltage value is normal, the transistor Q2 is turned on, the gate of the transistor Q1 is at a low level, so that the Q1 is turned on, at the moment, the voltage VCC _5 (namely the working voltage of the Wi-SUN module) starts to provide a charging voltage VCC _ CAP for the super capacitor at the rear end, and the resistors R3-R6 form a current-limiting resistor parallel circuit, so that the transistor Q1 is prevented from being burnt by too high current at the initial charging moment and the stability of the power supply VCC _5 is prevented from being influenced by too large load.
The protection circuit comprises a resistor R10, a resistor R11, a resistor R14, a resistor R18, a resistor R19, a resistor R20, a voltage reference chip D3, a voltage reference chip D4, a capacitor C3 and a capacitor C5, wherein one end of the resistor R10 is connected with an energy storage charging end and one end of the resistor R11 respectively, the other end of the resistor R11 is connected with the negative electrode of the voltage reference chip D3, the other end of the resistor R10 is connected with a control end of the voltage reference chip D3 and one end of the resistor R14 respectively, the other end of the resistor R14 is connected with the negative electrode of the capacitor C3 and the positive electrode of the voltage reference chip D3 respectively, and the positive electrode of the capacitor C3 is connected with the energy storage charging end; one end of a resistor R18 is connected with the anode of a capacitor C5 and one end of a resistor R19 respectively, the other end of the resistor R19 is connected with the cathode of a voltage reference chip D4, the other end of a resistor R18 is connected with the control end of a voltage reference chip D4 and one end of a resistor R20 respectively, the other end of the resistor R20 is connected with the cathode of a capacitor C5 and the anode of a voltage reference chip D4 respectively, the anode of a capacitor C5 is connected with the cathode of a capacitor C3, and the cathode of a capacitor C5 is grounded.
The voltage reference chips D3 and D4 may be TL431 chips, where the a terminal is an anode, the K terminal is a cathode, the VREF terminal is a control terminal, that is, the control terminal is a third connection port of the voltage reference chip except the anode and the cathode, the capacitor C3 and the capacitor C5 may be a super capacitor that the energy storage module 5 needs to protect, and the anode of the capacitor C3 is connected to the energy storage charging terminal, that is, the D terminal. The mode of connecting two 25F/2.7V super capacitors in series is adopted, the requirement of 5V charging voltage can be met, and the design of the energy storage power supply is simplified. Because the capacitance value precision of the super capacitor is generally high, if no special treatment is carried out, the condition that the two capacitors are unbalanced in charging is easy to occur, and the super capacitor can be damaged in serious cases. D3 and D4 are voltage reference chips and form a capacitance protection circuit together with a resistor. Taking the capacitor C3 as an example, when the voltage across the capacitor exceeds 2.7V, the voltage value obtained by dividing the voltage by the resistors R10 and R14 exceeds the reference voltage of D3, and the D3 will increase its reverse current to release the charge energy on C3 until the voltage value across the capacitor is less than 2.7V; the same principle is applied to the protection process of the capacitor C5.
The boost module 7 includes a boost circuit, as shown IN fig. 5, the boost circuit includes a chip U1, an LX terminal of the chip U1 is connected to the energy storage charging terminal through an inductor L1, an IN terminal of the chip U1 is connected to one terminal of a capacitor C4 and the voltage input terminal, the other terminal of the capacitor C4 is grounded, an EN terminal of the chip U1 is connected to one terminal of a resistor R17 and the collector of a transistor Q3, one terminal of the resistor R17 is connected to the voltage input terminal, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to one terminal of a resistor R21 and one terminal of a resistor R22, the other terminal of the resistor R21 is connected to the external power supply output terminal, the other terminal of the resistor R22 is grounded, the GND terminal of the chip U1 is grounded, the FB terminal of the chip U1 is connected to one terminal of the resistor R12 and one terminal of the resistor 57315, the other terminal of the resistor R12 is connected to the OUT terminal of the chip U1, and one terminal of the capacitor C8653 are connected to one terminal of the capacitor C84 2, the other end of the capacitor C1 and the other end of the capacitor C2 are both grounded, the OUT terminal of the chip U1 is connected with the anode of the voltage reference chip D2, and the cathode of the voltage reference chip D2 is connected with the voltage input terminal.
The IN end of the chip U1 is connected with one end of the capacitor C4 and a voltage input end, namely the f end, respectively, the negative electrode of the voltage reference chip D2 is connected with the voltage input end, namely the g end, and the output end, namely the C end, of the voltage reduction unit 9 are both connected with the charging port of the Wi-SUN communication module 3, and are used for supplying power to the Wi-SUN communication module 3 by replacing the C end with the g end when power failure occurs. The boost DC/DC chip U1 selected here can be SY7072 chip, and its biggest characteristic is that when the low voltage is less than 2V input, its biggest output current can still meet 800mA (the current is about 700mA when the Wi-SUN module emits at maximum power 30 dBm). Therefore, the discharge efficiency of the front-end super capacitor is high, and the requirement of the standby power supply for a long time after power failure can be met. When the external power supply VCC _12 is supplying power normally, the transistor Q3 is turned off, and the U1 stops working because the enable pin is pulled down; when VCC _12 is powered down, the transistor Q3 is disconnected, the U1 starts to work because the enable pin is pulled high, and at the moment, the Wi-SUN module power supply is obtained by discharging through the super capacitor and boosting. D2 is used for preventing VCC-5 power from flowing back to the DC/DC front end when the external power supply supplies power, and plays a role in isolation.
The embodiment includes a method for reporting a Wi-SUN network power failure, as shown in fig. 6, including the following steps:
s1: the voltage monitoring module 2 detects that the power supply voltage of the external power supply module 1 is lower than a threshold value;
s2: the voltage monitoring module 2 sends a data reporting instruction to the Wi-SUN communication module 3 through the input end of the comparator;
s3: the charging control module 4 closes a charging channel of the energy storage module 5;
s4: the energy storage module 5 supplies power to the Wi-SUN communication module 3 through the discharge control module 6 and the boosting module 7;
s5: and the Wi-SUN communication module 3 reports the current data to the background control center. By the method, after the communication equipment in the Wi-SUN network is powered off, the power-off management circuit is effectively and automatically started, and the standby power supply is used for continuously providing a working power supply for the Wi-SUN module, so that the Wi-SUN module can finish the reporting of the power-off event and related data.
In this embodiment, the external power module 1 supplies power to the Wi-SUN communication module 3, or charges the energy storage module 5 through the charging control module 4, when the voltage monitoring module 2 detects that the voltage value of the external power falls to a set threshold, a power-down event is triggered, current data is reported to a background control center through the Wi-SUN network, the charging control module 4 closes a charging circuit of the energy storage module 5, the energy storage module 5 supplies power to the Wi-SUN communication module 3 after boosting through the discharging control module 6 and the boosting module 7, so that after the power-down of the communication equipment in the Wi-SUN network is realized, an effective self-starting power-down management circuit is started, and a standby power supply is continuously used for providing a working power supply for the Wi-SUN module, the system has a simple and ingenious structure, can effectively save the product cost, reduce the influence of the product volume on the system, and meet the requirement after the external power supply of the Wi-SUN communication equipment is powered down, the message uploading task with large data volume can be realized.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. A system for reporting power failure of a Wi-SUN network is characterized by comprising an external power supply module (1), a voltage monitoring module (2) for detecting the voltage state of the external power supply, a Wi-SUN communication module (3), a charging control module (4), an energy storage module (5), a discharging control module (6) and a boosting module (7), the voltage monitoring module (2) is respectively connected with an external power supply module (1) and the Wi-SUN communication module (3), the external power supply module (1) is respectively connected with the Wi-SUN communication module (3) and the charging control module (4), the charging control module (4) is connected with the boosting module (7) through the energy storage module (5) and the discharging control module (6) in sequence, the boosting module (7) is connected with the Wi-SUN communication module (3).
2. The system for Wi-SUN network power-down reporting according to claim 1, wherein the boost module (7) comprises a boost circuit, the boost circuit comprises a chip U1, the LX terminal of a chip U1 is connected with the energy storage charging terminal through an inductor L1, the IN terminal of a chip U1 is respectively connected with one end of a capacitor C4 and the voltage input terminal, the other end of a capacitor C4 is grounded, the EN terminal of a chip U1 is respectively connected with one end of a resistor R17 and the collector of a transistor Q3, one end of a resistor R17 is connected with the voltage input terminal, the emitter of a transistor Q3 is grounded, the base of a transistor Q3 is respectively connected with one end of a resistor R21 and one end of a resistor R22, the other end of a resistor R21 is connected with the external power output terminal, the other end of a resistor R22 is grounded, the GND terminal of a chip U1 is grounded, the FB terminal of a chip U1 is respectively connected with one end of a resistor R12 and one end of a resistor R15, the other end of the resistor 15 is grounded, the other end of the resistor R12 is connected with the OUT end of the chip U1, the OUT end of the chip U1 is connected with one end of the capacitor C1 and one end of the capacitor C2 respectively, the other end of the capacitor C1 and the other end of the capacitor C2 are grounded, the OUT end of the chip U1 is connected with the anode of the voltage reference chip D2, and the cathode of the voltage reference chip D2 is connected with the voltage input end.
3. The system for Wi-SUN network power-down reporting according to claim 1 or 2, characterized in that the device also comprises a protection module (10), the protection module (10) is connected with the energy storage module (5), the protection module (10) comprises a protection circuit, the protection circuit comprises a resistor R10, a resistor R11, a resistor R14, a resistor R18, a resistor R19, a resistor R20, a voltage reference chip D3, a voltage reference chip D4, a capacitor C3 and a capacitor C5, one end of the resistor R10 is connected with an energy storage charging end and one end of the resistor R11 respectively, the other end of the resistor R11 is connected with the negative electrode of the voltage reference chip D3, the other end of the resistor R10 is connected with the control end of the voltage reference chip D3 and one end of the resistor R14 respectively, the other end of the resistor R14 is connected with the negative electrode of the capacitor C3 and the positive electrode of the voltage reference chip D3 respectively, and the positive electrode of the capacitor C3 is connected with the energy storage charging end; one end of a resistor R18 is connected with the anode of a capacitor C5 and one end of a resistor R19 respectively, the other end of the resistor R19 is connected with the cathode of a voltage reference chip D4, the other end of a resistor R18 is connected with the control end of a voltage reference chip D4 and one end of a resistor R20 respectively, the other end of the resistor R20 is connected with the cathode of a capacitor C5 and the anode of a voltage reference chip D4 respectively, the anode of a capacitor C5 is connected with the cathode of a capacitor C3, and the cathode of a capacitor C5 is grounded.
4. The system for Wi-SUN network power-down reporting according to claim 3, wherein the voltage monitoring module (2) comprises a voltage monitoring circuit, the voltage monitoring circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected to the external power connection terminal, the other end of the resistor R1 is connected to the comparator input terminal and one end of the resistor R2, and the other end of the resistor R2 is grounded.
5. The system for Wi-SUN network power-down reporting according to claim 1 or 2, wherein the charging control module (4) comprises a charging control circuit, the charging control circuit comprises a current-limiting resistor R3, a current-limiting resistor R4, a current-limiting resistor R5, a current-limiting resistor R6, a transistor Q1, a transistor Q2, a resistor R7, a resistor R8 and a resistor R13, the current-limiting resistor R3, the current-limiting resistor R4, the current-limiting resistor R5 and the current-limiting resistor R6 are sequentially connected in parallel to form a current-limiting resistor parallel circuit, the current-limiting resistor parallel circuit is connected with a source of the transistor Q1, a drain of the transistor Q1 is connected with the energy storage charging terminal, a gate of the transistor Q1 is connected with collectors of the resistor R7 and the transistor Q2, bases of the transistor Q2 are connected with the resistor R8 and the resistor R13, and an emitter of the transistor Q2 is grounded.
6. The system for Wi-SUN network power down reporting according to claim 1, 2 or 4, wherein the energy storage module (5) comprises a plurality of super capacitors.
7. The system for Wi-SUN network power failure reporting according to claim 1 or 2, wherein the external power supply module (1) comprises an external power supply unit (8) and a voltage reduction unit (9), and the external power supply unit (8) is connected with the Wi-SUN communication module (3) through the voltage reduction unit (9).
8. A method for Wi-SUN network power-down reporting, using any one of the systems of claims 1-7, comprising the steps of:
s1: the voltage monitoring module (2) detects that the power supply voltage of the external power supply module (1) is lower than a threshold value;
s2: the voltage monitoring module (2) sends a data reporting instruction to the Wi-SUN communication module (3) through the input end of the comparator;
s3: the charging control module (4) closes a charging channel of the energy storage module (5);
s4: the energy storage module (5) supplies power to the Wi-SUN communication module (3) through the discharge control module (6) and the boost module (7);
s5: and the Wi-SUN communication module (3) reports the current data to the background control center.
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