CN109540220B - Water condensation detection circuit and explosion-proof junction box internal environment detector - Google Patents
Water condensation detection circuit and explosion-proof junction box internal environment detector Download PDFInfo
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- CN109540220B CN109540220B CN201811622972.9A CN201811622972A CN109540220B CN 109540220 B CN109540220 B CN 109540220B CN 201811622972 A CN201811622972 A CN 201811622972A CN 109540220 B CN109540220 B CN 109540220B
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- 238000001514 detection method Methods 0.000 title claims abstract description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 238000009833 condensation Methods 0.000 title claims abstract description 93
- 230000005494 condensation Effects 0.000 title claims abstract description 93
- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 229910000679 solder Inorganic materials 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 39
- 238000004880 explosion Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 150000003071 polychlorinated biphenyls Chemical class 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 1
- 239000011572 manganese Substances 0.000 description 17
- 238000012423 maintenance Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
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- 238000005065 mining Methods 0.000 description 2
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- XOMKZKJEJBZBJJ-UHFFFAOYSA-N 1,2-dichloro-3-phenylbenzene Chemical compound ClC1=CC=CC(C=2C=CC=CC=2)=C1Cl XOMKZKJEJBZBJJ-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
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- 238000005507 spraying Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention provides a water condensation detection circuit which comprises a processor, a power supply circuit, a divider resistor, a filter capacitor and a PCB (printed circuit board) M1, wherein the divider resistor is connected with the processor; an upper printed line and a lower printed line which are not communicated with each other are arranged on the PCB M1 in a crossing manner, and no solder resist is coated on the upper printed line and the lower printed line; the upper printed line is connected with the power supply through the voltage dividing resistor, the lower printed line is grounded through the filter capacitor, and the lower printed line is also connected with the processor and is used for outputting water condensation detection voltage to the processor; and the processor judges whether the water condensation phenomenon exists or not according to the water condensation detection voltage. The invention also provides an internal environment detector of the explosion-proof junction box based on the water condensation detection circuit.
Description
Technical Field
The invention relates to the field of environment detection, in particular to a water condensation detection circuit and an internal environment detector of an explosion-proof junction box.
Background
The electric appliance cabinet, the explosion-proof junction box and the like of the on-site instrument of the coastal petrochemical enterprises cause water inflow or condensation phenomena due to poor sealing of valve wiring, spraying under the condition of temperature difference or other accidents, equipment malfunction such as interlocking parking or equipment misoperation, false alarm and the like, and customers cannot find out in time when water inflow or condensation occurs due to the fact that the explosion-proof junction box is sealed mostly, and if the efficiency is too low for periodic maintenance only by manpower, the safety management cost is high and passive.
The product or the patent for detecting whether water is condensed in the explosion-proof junction box is not found in the market at present, the patent for detecting the temperature and the humidity in the explosion-proof junction box is found, but through long-term test and on-site industrial and mining simulation, the linear relation between the humidity and the water condensation is found, and especially when the explosion-proof junction box is sprayed by water and water enters under the unexpected condition, the temperature and the humidity value are not changed in real time. For detecting water condensation, a condensation detection sensor is currently available in the market, long-term experiments on the condensation sensor show that the sensor is manufactured by utilizing a humidity sensitive material, when water inlet maintenance is found in the industrial and mining test process, the sensor is not wiped for hundreds of times, desorption occurs on the humidity sensitive material, and the detection sensitivity is greatly reduced.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a water condensation detection circuit and an explosion-proof junction box internal environment detector.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the water condensation detection circuit comprises a processor, a power supply circuit, a divider resistor, a filter capacitor and a PCB (printed circuit board) M1;
an upper printed line and a lower printed line which are not communicated with each other are arranged on the PCB M1 in a crossing manner, and no solder resist is coated on the upper printed line and the lower printed line;
the upper printed line is connected with the power supply through the voltage dividing resistor, the lower printed line is grounded through the filter capacitor, and the lower printed line is also connected with the processor and is used for outputting water condensation detection voltage to the processor;
and the processor judges whether the water condensation phenomenon exists or not according to the water condensation detection voltage.
Based on the above, the water condensation detection circuit comprises a divider resistor, a filter capacitor and cascaded PCB boards M1-Mn, wherein n is more than 1; an upper printed line and a lower printed line are arranged on each PCB in a crossing way, no solder resist is covered on the upper printed line and the lower printed line, and the upper printed line is not communicated with the lower printed line;
the 1 end of the PCB M1 is connected with the power supply through the voltage dividing resistor, the 2 end of the PCB M1 is grounded through the filter capacitor, and the 2 end of the PCB M1 is also connected with the processor; the 3 ends of the PCB M1 are connected with the 1 end or the 3 end of the PCB M2 through cascading resistors, and the 4 ends of the PCB M1 are connected with the 2 end or the 4 end of the PCB M2 through cascading resistors and are sequentially cascaded until the ends are cascaded to the PCB Mn.
Based on the above, the resistances between the upper printed wiring and the lower printed wiring on the PCBs M1 to Mn are the same, and the pitches between the upper printed wiring and the lower printed wiring on the PCBs M1 to Mn may be the same or different.
Based on the above, the cascade resistances between the PCB boards M1-Mn may be the same or different.
The invention also provides an internal environment detector of the explosion-proof junction box, which comprises the water condensation detection circuit, a temperature and humidity detection circuit, an alarm circuit and a wireless communication circuit,
the processor judges whether a water condensation phenomenon exists according to the water condensation detection voltage;
the temperature and humidity detection circuit is connected with the processor and used for detecting temperature and humidity data in the explosion-proof junction box and transmitting the temperature and humidity data to the processor;
the processor compares the temperature and humidity data with a preset temperature and humidity threshold value respectively, controls the alarm circuit to alarm when the temperature and humidity data is greater than or equal to the preset temperature and humidity threshold value or when a water condensation phenomenon exists, and transmits alarm information to an external monitoring center through the wireless communication circuit;
the power supply is respectively connected with the temperature and humidity detection circuit, the alarm circuit and the wireless communication circuit and is used for supplying power to the temperature and humidity detection circuit, the alarm circuit and the wireless communication circuit.
Based on the above, the processor communicates with the external monitoring center according to the first time interval when no alarm is given, and communicates with the external monitoring center according to the second time interval when the alarm is given and the alarm time length is greater than or equal to the preset alarm time length threshold.
Based on the above, the internal environment detector of the explosion-proof junction box further comprises a shell, one end of the shell is a transparent lampshade, the other end of the shell is provided with a sealing thread head, and the shell is installed in the explosion-proof junction box through the sealing thread head; the processor, the NBIOT wireless communication circuit, the power supply and the alarm circuit are arranged inside the shell, and the environment monitoring unit is arranged outside the shell and is connected with the processor and the power supply through cable wires.
Based on the above, the internal environment detector of the explosion-proof junction box further comprises a clock unit connected with the processor, the clock unit sends a trigger signal to the processor every a first preset time length, the processor runs a second preset time length under the triggering of the trigger signal, the temperature and humidity detection circuit is controlled to collect temperature and humidity data in real time, the water condensation detection circuit is controlled to output water condensation detection voltage in real time, and an alarm is given according to the temperature and humidity data and the water condensation detection voltage.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, in particular, the invention designs a water condensation detection circuit by utilizing the detection mode of the PCB cross wiring, judges whether the water condensation phenomenon exists or not by the resistance change condition between the upper printed line and the lower printed line, does not reduce the sensitivity along with the change of the wiping times, enhances the maintainability of the product, can flexibly cascade each module, expands the detection coverage of the product, and can change the shape of the PCB according to the installation space condition, thereby leading the product to have more flexibility.
The invention also designs an explosion-proof junction box internal environment detector based on the water condensation detection circuit, when the temperature or humidity of the explosion-proof junction box internal environment detector is abnormal or water inlet or water condensation phenomenon exists in the explosion-proof junction box, the explosion-proof junction box internal environment detector carries out local alarm and uploads alarm information to an external monitoring center through the wireless communication circuit, the external monitoring center can also push the alarm information to mobile phones of related management personnel or maintenance personnel in real time, and the specific position of the explosion-proof junction box to be maintained is positioned, so that the related management personnel or maintenance personnel can timely acquire the abnormal information when the explosion-proof junction box is abnormal, and the management efficiency is high.
Drawings
Fig. 1 is a circuit schematic of the water condensation detection circuit in embodiment 1 of the present invention.
Fig. 2 is a circuit schematic of the water condensation detection circuit in embodiment 2 of the present invention.
Fig. 3 is a schematic block diagram of an internal environment detector of an explosion-proof junction box according to embodiment 3 of the present invention.
Fig. 4 is a schematic view showing the structure of an internal environment detector of an explosion-proof junction box according to embodiment 3 of the present invention.
Fig. 5 is a circuit schematic of the power supply according to embodiment 3 of the present invention.
Fig. 6 is a circuit schematic diagram of the temperature and humidity detecting circuit in embodiment 3 of the present invention.
Fig. 7 is a circuit schematic of the alarm circuit in embodiment 3 of the present invention.
Fig. 8 is a circuit diagram of a wireless communication circuit according to embodiment 3 of the present invention.
In the figure, 1. A housing; 2. a transparent lampshade; 3. sealing the thread head; 4. a temperature and humidity detection circuit; and 5. A PCB board.
Detailed Description
The technical scheme of the invention is further described in detail through the following specific embodiments.
Example 1
As shown in fig. 1, the invention provides a water condensation detection circuit, which comprises a processor, a power supply circuit, a divider resistor R1, a filter capacitor C5 and a PCB board M1;
an upper printed line and a lower printed line which are not communicated with each other are arranged on the PCB M1 in a crossing manner, and no solder resist is coated on the upper printed line and the lower printed line;
the upper printed line is connected with the power supply through the voltage dividing resistor R1, the lower printed line is grounded through the filter capacitor C5, and the lower printed line is also connected with the processor and is used for outputting water condensation detection voltage to the processor;
and the processor judges whether the water condensation phenomenon exists or not according to the water condensation detection voltage.
When the anti-explosion wiring box is used, the PCB is tightly attached to the inner wall of the bottom of the anti-explosion wiring box, and when water is condensed on the PCB M1, the resistance between the upper printed line and the lower printed line which are mutually interacted on the PCB can be changed rapidly; normally, when no water is condensed, the resistance between the upper printed line and the lower printed line approaches infinity, and when water is condensed, condensed water drops can be communicated with the upper printed line and the lower printed line, so that the resistance between the upper printed line and the lower printed line is smaller than 100K; the resistance value of the abrupt change can lead to the abrupt change of the water condensation detection voltage output to the processor end, and the processor can judge that the water condensation phenomenon exists in the explosion-proof junction box according to the change condition of the water condensation detection voltage.
Compared with the traditional water condensation detection circuit, the sensitivity of the water condensation detection circuit is not reduced along with the change of the wiping times in the maintenance process.
The resistor R1 provides voltage for the water condensation detection circuit and converts the resistance change of the PCB M1 into voltage change, and the filter capacitor C5 can filter interference signals of space and lines; preferably, the voltage dividing resistor R1 is a 2M resistor, and the filter capacitor C5 is a 0.47uF capacitor.
In addition, the line spacing between the upper printed line and the lower printed line on the PCB board M1 may be designed to be different line spacing according to the size of the condensed water drop to be detected, such as 0.2mm,0.3mm,0.4mm,0.6mm,0.7mm,0.8mm,1.0mm, etc., so as to realize detection of the water drop with a specific size; for example, when the line spacing between the upper printed wiring and the lower printed wiring on the PCB board M1 is 0.2mm, detection of condensation water drops in the explosion-proof junction box of not less than 0.2mm can be achieved.
Example 2
This embodiment differs from embodiment 1 in that:
as shown in FIG. 2, the water condensation detection circuit comprises cascaded PCB boards M1-Mn, wherein n is greater than 1; the voltage dividing resistor R1 at the 1 end of the PCB M1 is connected with the power supply, the 2 end of the PCB M1 is grounded through the filter capacitor C5, and the 2 end of the PCB M1 is also connected with the processor and is used for outputting a water condensation detection voltage signal to the processor; the 3 ends of the PCB M1 are connected with the 1 end or the 3 end of the PCB M2 through a cascading resistor R, and the 4 ends of the PCB M1 are connected with the 2 end or the 4 end of the PCB M2 through a cascading resistor R and are sequentially cascaded until the ends are cascaded to the PCB Mn.
The line spacing between the upper printed line and the lower printed line on the PCB M1 to the PCB Mn is the same, and the resistance values between the upper printed line and the lower printed line on the PCB M1 to the PCB Mn are the same. The resistance value of each cascade resistor R between the PCB M1 and the PCB Mn can be the same or different, and 0-10K resistor can be selected according to specific application.
When the anti-explosion wiring box is used, the PCB M1 to the PCB Mn are arranged on the inner wall of the anti-explosion wiring box according to different heights, water condensation detection voltage values when condensation water drops which enable the upper printed wiring and the lower printed wiring to be communicated on any one or more PCBs are pre-calculated, and the water condensation detection voltage values are stored in a form of a table; when the water condensation detection voltage changes suddenly, the processor can judge which one or more PCB boards have condensation water drops according to the voltage value of the water condensation detection voltage in a table look-up mode, so that the water accumulation height in the explosion-proof junction box is determined.
Example 3
This embodiment differs from embodiment 2 in that: the line spacing between the upper printed line and the lower printed line on the PCB M1-Mn is different, the resistance values between the upper printed line and the lower printed line on the PCB M1-Mn are the same, and the resistance values of each cascade resistor R between the PCB M1-Mn are different.
For example, the line spacing between the upper and lower tracks on the PCB M1 is 0.1mm, the line spacing between the upper and lower tracks on the PCB M2 is 0.2mm, the line spacing between the upper and lower tracks on the PCB Mn is 1mm, and the resistance value of each cascading resistor between the PCB M1 and the PCB Mn may be 0-10 k according to the specific application.
When the anti-explosion wiring box is used, the PCB M1 to the PCB Mn are arranged on the inner wall of the anti-explosion wiring box according to the same height, water condensation detection voltage values when condensation water drops which enable the upper printed wiring and the lower printed wiring to be communicated on any one or more PCBs are pre-calculated, and the water condensation detection voltage values are stored in a form of a table; when the water condensation detection voltage changes suddenly, the processor can judge which one or more PCB boards are provided with condensed water drops which enable the upper printed line and the lower printed line to be communicated in a table look-up mode according to the voltage value of the water condensation detection voltage, so that detection of water drops with different sizes is realized.
Example 4
As shown in fig. 3, the present invention provides an explosion-proof junction box internal environment detector, which comprises the above water condensation detection circuit, temperature and humidity detection circuit, alarm circuit and wireless communication circuit,
the processor judges whether a water condensation phenomenon exists according to the water condensation detection voltage;
the temperature and humidity detection circuit is connected with the processor and used for detecting temperature and humidity data in the explosion-proof junction box and transmitting the temperature and humidity data to the processor;
the processor compares the temperature and humidity data with a preset temperature and humidity threshold value respectively, controls the alarm circuit to alarm when the temperature and humidity data is greater than or equal to the preset temperature and humidity threshold value or when a water condensation phenomenon exists, and transmits alarm information to an external monitoring center through the wireless communication circuit;
the power supply is respectively connected with the temperature and humidity detection circuit, the alarm circuit and the wireless communication circuit and is used for supplying power to the temperature and humidity detection circuit, the alarm circuit and the wireless communication circuit.
In a specific application, as shown in fig. 4, the internal environment detector of the explosion-proof junction box further comprises a shell 1, wherein one end of the shell 1 is a transparent lampshade 2, the other end of the shell 1 is provided with a sealing thread head 3, and the shell 1 is installed in the explosion-proof junction box through the sealing thread head 3; the processor, the NBIOT wireless communication circuit, the power supply, the alarm circuit, the divider resistor R1 and the filter capacitor C5 of the water condensation detection circuit are arranged inside the shell 1, and the temperature and humidity detection circuit 4 and the PCB 5 of the water condensation detection circuit are arranged outside the shell 1 and connected with the processor and the power supply through cable wires.
As shown in fig. 5, the power supply includes a battery, a MOSFET tube 1, a MOSFET tube 2 and a DC/DC power conversion chip, preferably, the battery is a CR123A non-rechargeable lithium manganese battery, the rated voltage is 3.0V, the rated capacity is 1300mAh, and the battery outputs a power supply voltage BAT-V; the grid electrodes of the MOSFET 1 and the MOSFET 2 are respectively connected with the processor, the source electrodes of the MOSFET 1 and the MOSFET 2 are respectively connected with a power supply voltage BAT-V, the drain electrode of the MOSFET 2 outputs a power supply voltage POW-SENSOR, the drain electrode of the MOSFET 1 is connected with the input pin of the DC/DC conversion chip, and the output pin of the DC/DC conversion chip outputs a power supply voltage V-NBIOT.
As shown in fig. 6, the temperature and humidity detection circuit includes a digital output temperature and humidity detection chip U2, and preferably, the digital output temperature and humidity detection chip U2 is an HTU21DF; the SCL pin of the digital output temperature and humidity detection chip U2 and the SDA pin of the digital output temperature and humidity detection chip U2 are respectively connected with the processor and are used for realizing communication between the digital output temperature and humidity detection chip U2 and the processor; the VDD pin of the digital output temperature and humidity detection chip U2 is connected with the power supply voltage POW-SENSOR, the GND pin of the digital output temperature and humidity detection chip U2 is grounded, and a filter capacitor C6 is further arranged between the VDD pin of the digital output temperature and humidity detection chip U2 and the GND pin of the digital output temperature and humidity detection chip U2.
As shown in fig. 7, the alarm circuit includes a MOSFET T1, a resistor R4, a resistor R5, and an alarm LED lamp D2, where a gate of the MOSFET T1 is connected to the processor through the resistor R4, a source of the MOSFET T1 is grounded, and a drain of the MOSFET T1 is connected to a power supply voltage BAT-V through the resistor R5 and the alarm LED lamp D2.
Preferably, the resistance value of the resistor R4 is 100K, the resistance value of the resistor R5 is 200K, the alarm LED lamp D2 is a red LED, and the MOSFET tube T1 is an N-communication MOSFET tube NDS331N; when water is condensed, the processor periodically outputs high level to trigger the MOSFET T1 to be conducted, so that the alarm LED lamp D2 flashes to prompt an alarm.
As shown in fig. 8, the wireless communication circuit includes an NBIOT wireless communication module DL101_nbiot and an overvoltage protection TVS tube D, a VCC3V3 pin of the NBIOT wireless communication module DL101_nbiot is connected with a power supply voltage V-NBIOT, a GND pin of the NBIOT wireless communication module DL101_nbiot is grounded, and the overvoltage protection TVS tube D1, a capacitor C2, a capacitor C3 and a capacitor C4 are further connected in parallel between the VCC3V3 pin of the NBIOT wireless communication module DL101_nbiot and the GND pin of the NBIOT wireless communication module DL 101_nbiot; and an antenna is also inserted into an antenna socket of the NBIOT wireless communication module DL 101_NBIOT.
Preferably, the receiving frequency of the wireless communication circuit is 869 MHz-894 MHz, and the transmitting frequency is 823 MHz-849 MHz; the capacitor C1 is a tantalum electrolytic capacitor, and the capacitance value is 10uF; the capacitor C2, the capacitor C3 and the capacitor C4 are ceramic chip capacitors, wherein the capacitance value of the capacitor C2 is 22pF, the capacitance value of the capacitor C3 is 100pF, and the capacitance value of the capacitor C4 is 0.1uF; the capacitors C1-C4 are used for filtering interference signals of the power supply voltage V-NBIOT; the model of the overvoltage protection TVS tube D1 is NSPM2051, and is used for providing surge voltage bearing capacity of the NBIOT wireless communication circuit.
Preferably, the processor is a singlechip STM32L031G6U6, the singlechip STM32L031G6U6 is a Cortex-M0+ -based 32-bit ultra-low power consumption MCU, the processor has Flash 32KB,8KB SRAM,1KB EEPROM,12bit ADC, the working voltage range is 1.65-3.6V, and the working temperature range is-40-125 ℃; the operating current in standby mode was 0.23uA and in stop mode was 0.35uA.
The internal environment detector of the explosion-proof junction box detects the temperature and humidity inside the explosion-proof junction box in real time through the temperature and humidity detection circuit, detects whether water inflow or water condensation phenomenon exists in the explosion-proof junction box in real time through the water condensation detection circuit, gives a local alarm when the temperature or humidity is abnormal or the water inflow or water condensation phenomenon exists in the explosion-proof junction box, uploads alarm information to an external monitoring center through the wireless communication circuit, and the external monitoring center can also push the alarm information to mobile phones of relevant management personnel or maintenance personnel in real time and position the specific position of the explosion-proof junction box to be maintained, so that the relevant management personnel or maintenance personnel can timely learn abnormal information when the explosion-proof junction box is abnormal, and the management efficiency is high.
Example 5
This embodiment differs from embodiment 4 in that: the processor is communicated with the external monitoring center according to a first time interval when no alarm exists, and is communicated with the external monitoring center according to a second time interval when the alarm exists and the alarm time length is greater than or equal to a preset alarm time length threshold value.
The workflow of the environment detector in this embodiment is set as follows: under normal conditions, if the first time interval is over, the processor starts the wireless communication circuit when judging that no alarm exists according to the temperature and humidity data and the water condensation detection voltage, and uploads the maximum value of the temperature data, the maximum value of the humidity information and whether the water condensation phenomenon exists in the first time interval to an external monitoring center;
if in the first time interval, when the processor judges that an alarm exists according to the temperature and humidity data and the water condensation detection voltage, the processor immediately starts the wireless communication circuit, uploads the temperature data, the humidity data and whether the water condensation phenomenon exists at the current moment to the external monitoring center, and starts timing at the same time.
Preferably, the first time interval is 24h, and the second time interval is 30min.
Example 6
This embodiment differs from embodiment 5 in that: the internal environment detector of the explosion-proof junction box further comprises a clock unit connected with the processor, the clock unit sends a trigger signal to the processor every a first preset time length, the processor runs a second preset time length under the triggering of the trigger signal, the temperature and humidity detection circuit is controlled to collect temperature and humidity data in real time, the water condensation detection circuit is controlled to output water condensation detection voltage in real time, and an alarm is given according to the temperature and humidity data and the water condensation detection voltage.
Preferably, the first preset time is 100s, the second preset time is 1s, that is, the environment detector works for 1s to detect the temperature, humidity and water condensation condition, if no abnormality exists, the detector is dormant for 100s, and then the detection is started, if no abnormality exists, the dormancy is continued, and the process is repeated.
By the method, the working mode of the processor can be set to be an operation mode and the dormant mode to be an alternating mode of working and dormant, the purpose of saving energy consumption is achieved, and the duty ratio of the first preset time and the second preset time can be adjusted according to actual requirements.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (10)
1. A water condensation detection circuit, characterized in that: the water condensation detection circuit comprises a processor, a power supply, a divider resistor, a filter capacitor and cascaded PCB boards M1-Mn, wherein n is more than 1; an upper printed line and a lower printed line are arranged on each PCB in a crossing way, no solder resist is covered on the upper printed line and the lower printed line, and the upper printed line is not communicated with the lower printed line;
the 1 end of the PCB M1 is connected with the power supply through the voltage dividing resistor, the 2 end of the PCB M1 is grounded through the filter capacitor, and the 2 end of the PCB M1 is also connected with the processor; the 3 end of the PCB M1 is connected with the 1 end or the 3 end of the PCB M2 through a cascading resistor, and the 4 end of the PCB M1 is connected with the 2 end or the 4 end of the PCB M2 through a cascading resistor and is sequentially cascaded until being cascaded to the PCB Mn;
when the anti-explosion wiring box is used, the PCB M1 to the PCB Mn are arranged on the inner wall of the anti-explosion wiring box according to different heights, water condensation detection voltage values when condensation water drops which enable the upper printed wiring and the lower printed wiring to be communicated on any one or more PCBs are pre-calculated, and the water condensation detection voltage values are stored in a form of a table; when the water condensation detection voltage changes suddenly, the processor can judge which one or more PCB boards have condensation water drops according to the voltage value of the water condensation detection voltage in a table look-up mode, so that the water accumulation height in the explosion-proof junction box is determined.
2. The water condensation detection circuit according to claim 1, wherein: and the resistance and resistance values between the upper printed wiring and the lower printed wiring on the PCB boards M1-Mn are the same.
3. The water condensation detection circuit according to claim 1, wherein: and the cascade resistances among the PCB boards M1-Mn are the same.
4. The water condensation detection circuit according to claim 1, wherein: the cascade resistances among the PCB boards M1-Mn are different.
5. An explosion-proof junction box internal environment detector comprising the water condensation detection circuit according to any one of claims 1 to 4, characterized in that: also comprises a temperature and humidity detection circuit, an alarm circuit and a wireless communication circuit,
the processor judges whether a water condensation phenomenon exists according to the water condensation detection voltage;
the temperature and humidity detection circuit is connected with the processor and used for detecting temperature and humidity data in the explosion-proof junction box and transmitting the temperature and humidity data to the processor;
the processor compares the temperature and humidity data with a preset temperature and humidity threshold value respectively, controls the alarm circuit to alarm when the temperature and humidity data is greater than or equal to the preset temperature and humidity threshold value or when a water condensation phenomenon exists, and transmits alarm information to an external monitoring center through the wireless communication circuit;
the power supply is respectively connected with the temperature and humidity detection circuit, the alarm circuit and the wireless communication circuit and is used for supplying power to the temperature and humidity detection circuit, the alarm circuit and the wireless communication circuit.
6. The explosion-proof junction box internal environment detector according to claim 5, wherein: the temperature and humidity detection circuit comprises a digital output temperature and humidity detection chip U2, wherein an SCL pin of the digital output temperature and humidity detection chip U2 and an SDA pin of the digital output temperature and humidity detection chip U2 are respectively connected with the processor and used for realizing communication between the digital output temperature and humidity detection chip U2 and the processor; the VDD pin of the digital output temperature and humidity detection chip U2 is connected with the power supply, the GND pin of the digital output temperature and humidity detection chip U2 is grounded, and a capacitor C6 is further arranged between the VDD pin of the digital output temperature and humidity detection chip U2 and the GND pin of the digital output temperature and humidity detection chip U2.
7. The explosion-proof junction box internal environment detector according to claim 5, wherein: the alarm circuit comprises a MOSFET T1, a resistor R4, a resistor R5 and an alarm LED lamp D2, wherein the grid electrode of the MOSFET T1 is connected with the processor through the resistor R4, the source electrode of the MOSFET T1 is grounded, and the drain electrode of the MOSFET T1 is connected with the power supply through the resistor R5 and the alarm LED lamp D2;
the wireless communication circuit comprises an NBIOT wireless communication module DL101_NBIOT and an overvoltage protection TVS tube D, wherein a VCC3V3 pin of the NBIOT wireless communication module DL101_NBIOT is connected with the power supply, a GND pin of the NBIOT wireless communication module DL101_NBIOT is grounded, and the overvoltage protection TVS tube D and a filter capacitor are connected in parallel between the VCC3V3 pin of the NBIOT wireless communication module DL101_NBIOT and the GND pin of the NBIOT wireless communication module DL 101_NBIOT; and an antenna is also inserted into an antenna socket of the NBIOT wireless communication module DL 101_NBIOT.
8. The explosion-proof junction box internal environment detector according to claim 5, wherein: the processor is communicated with the external monitoring center according to a first time interval when no alarm exists, and is communicated with the external monitoring center according to a second time interval when the alarm exists and the alarm time length is greater than or equal to a preset alarm time length threshold value.
9. The explosion-proof junction box internal environment detector according to claim 5, wherein: the internal environment detector of the explosion-proof junction box further comprises a clock unit connected with the processor, the clock unit sends a trigger signal to the processor every a first preset time length, the processor runs a second preset time length under the triggering of the trigger signal, the temperature and humidity detection circuit is controlled to collect temperature and humidity data in real time, the water condensation detection circuit is controlled to output water condensation detection voltage in real time, and an alarm is given according to the temperature and humidity data and the water condensation detection voltage.
10. The explosion-proof junction box internal environment detector according to any one of claims 5 to 9, wherein: the internal environment detector of the explosion-proof junction box further comprises a shell, one end of the shell is a transparent lampshade, the other end of the shell is provided with a sealing thread head, and the shell is installed in the explosion-proof junction box through the sealing thread head; the processor, the wireless communication circuit, the power supply and the alarm circuit are arranged inside the shell, and the temperature and humidity detection circuit and the PCB boards M1-Mn of the water condensation detection circuit are arranged outside the shell and connected with the processor and the power supply through cable conductors.
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| CN110553747A (en) * | 2019-08-30 | 2019-12-10 | 华为技术有限公司 | device, method and system for detecting thermal runaway of electrical equipment |
| CN110554070B (en) * | 2019-09-25 | 2021-10-22 | 安徽帕维尔智能技术有限公司 | Dew condensation sensor and dew condensation detection device and method prepared by same |
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