CN213937078U - Thing networking traffic electronic box - Google Patents

Thing networking traffic electronic box Download PDF

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Publication number
CN213937078U
CN213937078U CN202023175253.2U CN202023175253U CN213937078U CN 213937078 U CN213937078 U CN 213937078U CN 202023175253 U CN202023175253 U CN 202023175253U CN 213937078 U CN213937078 U CN 213937078U
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power supply
module
current
circuit board
alternating current
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房晓辉
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Nanjing Yunyu Information Technology Co ltd
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Nanjing Yunyu Information Technology Co ltd
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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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/248—UPS systems or standby or emergency generators

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Abstract

The utility model discloses an internet of things traffic electric box, wherein a circuit board, a power module, a fan and a camera are arranged inside the electric box; the circuit board includes: the system comprises a power supply management module, an MCU (microprogrammed control unit) processor, a direct-current power supply monitoring module, an alternating-current power supply monitoring module, an NB-IOT (NB-input/output) module, a network port module, an analog input ADC (analog-to-digital converter) detection module, a GPS (global positioning system) module, a temperature and humidity sensor, a camera interface and a fan interface; the fan is connected with the MCU processor through a fan interface; a box door travel switch is arranged on the box door of the electric box; the camera interface is connected with a camera; the MCU processor is communicated with the background server.

Description

Thing networking traffic electronic box
Technical Field
The utility model relates to a thing networking traffic electronic box belongs to thing networking electronic box technical field.
Background
Along with the high-speed development of information, the urban pedestrian volume is continuously increased, the public security environment form is gradually complicated, and the traditional monitoring box of the conventional monitoring and protecting tool cannot meet the industrial requirements.
The traditional monitoring box has the following problems:
the wiring is messy, and the installation difficulty in earlier stage is big. Most of the traditional monitoring boxes are assembled by various scattered products and equipment, and the wiring is scattered. In addition, in the early installation, optical fiber cables of telecom operators and power companies are removed, other functional components are mostly provided by various manufacturers, and the internal connection debugging takes a lot of time.
The intelligent degree is low, and the interconnection degree of each device is low. The traditional monitoring box has no real-time monitoring function on modules such as lightning protection, a power supply and box door opening, temperature and humidity, and the like, so that the state of front-end equipment cannot be fed back, the safety performance of the equipment is easily reduced, and unnecessary faults of the equipment are damaged.
The fault location is difficult, and the detection efficiency is low. When equipment breaks down, the traditional monitoring box can not collect and analyze abnormal data streams and timely acquire front-end data equipment, so that operation and maintenance personnel are difficult to judge fault sources, the attendance times are increased, and the detection efficiency is reduced.
Disclosure of Invention
Utility model purpose: problem and not enough to exist among the prior art, the utility model provides a thing networking traffic electronic box.
The technical scheme is as follows: an Internet of things traffic electric box is characterized in that a circuit board, a power supply module, a fan and a camera are arranged inside the electric box; the circuit board includes: the system comprises a power supply management module, an MCU (microprogrammed control unit) processor, a direct-current power supply monitoring module, an alternating-current power supply monitoring module, an NB-IOT (NB-input/output) module, a network port module, an analog input ADC (analog-to-digital converter) detection module, a GPS (global positioning system) module, a temperature and humidity sensor, a camera interface and a fan interface; the fan is connected with the MCU processor through a fan interface; a box door travel switch is arranged on the box door of the electric box; the camera interface is connected with a camera arranged behind the box door; the MCU processor is communicated with the background server.
The power module comprises a 220V alternating current input alternating current leakage protector, a 220V alternating current to 24V alternating current transformer, a 220V alternating current to 12V direct current power supply and a 12V standby battery; the 220V alternating current leakage protector is used for leakage protection of the electric box, and external 220V alternating current is connected to a 24V alternating current transformer and a 12V direct current power supply after leakage protection, and respectively outputs 24V alternating current and 12V direct current; after the 220V alternating current and the 24V alternating current are subjected to on-off control of a relay of the circuit board and current value measurement of the current transformer, the 220V alternating current and the 24V alternating current are connected to a panel of the electric box to be used as power supply of external equipment; the 12V direct current is connected to the circuit board, on one hand, the circuit board is used as a working power supply of the circuit board and is connected with a power management module of the circuit board, on the other hand, the circuit board is output to a connector of the circuit board through a switching circuit and a direct current detection circuit of the circuit board, and the circuit board is conveniently used as direct current power supply of external equipment; the 12V standby battery is used as a standby power supply of the circuit board, and when the 220V power is cut off, the circuit board can work normally. The 12V direct current output by the power supply module and the 12V direct current of the standby battery respectively supply power to the MCU processor, the fan, the temperature and humidity sensor and the camera through the power supply management module;
the power management module is respectively connected with the 12V output of the power module and the standby battery and is used for switching a power supply, converting power supply voltage and restarting the electric box; the MCU processor is respectively connected with the direct-current power supply monitoring module, the alternating-current power supply monitoring module, the NB-IOT module, the network port module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan interface, the box door travel switch and the camera interface; the MCU processor is used for receiving input signals of the DC power supply monitoring module, the AC power supply monitoring module, the NB-IOT module, the Internet access module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan, the box door travel switch and the camera, and sending the received input information to the background server through the Internet access module, and simultaneously sending control signals to the DC power supply monitoring module, the AC power supply monitoring module, the NB-IOT module, the Internet access module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan, the box door travel switch and the camera.
The GPS module is electrified to send positioning information to the MCU processor; the NB-IOT module adopts a WH-NB73-BA module and carries out AT instruction communication with the MCU processor through a TTL serial port; the camera is connected with the MCU processor through an OV2640 interface; the temperature and humidity sensor adopts an SHT30 chip and sends collected temperature and humidity data to the MCU processor.
The analog input ADC detection module detects input analog quantity connected with external equipment and performs ADC sampling on the MCU processor, and comprises 2 analog quantity detection circuits, wherein one circuit is used for detecting current quantity, and the other circuit is used for detecting voltage quantity;
wherein, the current quantity is detected, the external TA inputs the current I, the current I passes through the ACS712 Hall current detection chip and reaches the ground, and the circuit board and the external equipment are grounded together to form a loop; the ACS712 converts the current signal into a voltage signal, divides the voltage by two resistors, and outputs the voltage signal to an ADC functional pin of the MCU processor for analog quantity detection;
and the other path of voltage detection is to directly divide the voltage analog quantity signal TV of the external equipment through a resistor and output the voltage analog quantity signal TV to an ADC (analog to digital converter) functional pin of the MCU processor for sampling detection.
The box door travel switch is arranged on the box door and transmits on-off signals of the box door travel switch to the MCU processor.
The power supply module comprises a 220V-to-12V switching power supply and a 12V output lithium battery standby power supply; the power management module realizes the switching between the switching power supply and the standby power supply through a PMOS tube.
The alternating current power supply monitoring module is connected in series in the alternating current loop and comprises a relay and a current transformer; the alternating current power supply monitoring module controls the on-off of alternating current through the relay, and realizes the 3.3V pin voltage control and the 5V relay control of the MCU processor through the triode, when the MCU control signal is high level, the triode is conducted, the control pin of the relay is grounded, the control side of the relay is conducted, namely current flows through a coil of the relay, a magnetic field is generated, then the relay switch is closed, and at the moment, a diode lamp of the switching indicator lamp is also conducted; when the MCU control signal is at a low level, the triode is cut off, no current exists at the control side of the relay, and the relay switch is disconnected; the current detection is completed through a current transformer; the transformation ratio of the current transformer is 2000: 1; the controlled alternating current of 220V and 24V is I, then the current of the secondary end of the current transformer is IAuxiliary setConverting the current into a voltage signal through a sampling resistor connected with the mutual inductor in parallel, wherein the signal detected by an ADC (analog to digital converter) functional pin of the MCU is the voltage signal U; and after the MCU processor obtains the voltage value, obtaining the loop current in the alternating current circuit loop.
The direct current power supply monitoring module is arranged in a direct current loop connected with an external load; the circuit board provides a direct current power supply for an external load, and the direct current power supply monitoring module is connected with the external load in series and is grounded together; the direct current power supply monitoring module completes two functions: controlling the on-off of the direct current output according to the MCU instruction to realize the current detection in the direct current loop;
the direct current power supply monitoring module controls the output direct current on-off function through an IRF7324, and the IRF7324 integrates two PMOSs;
the current detection of the dc power supply monitoring module is realized by the hall current detection chip ACS 712.
The MCU processor is an STM32F407ZET6 main control chip.
Has the advantages that: compared with the prior art, the utility model provides a thing networking traffic electronic box has following advantage:
high integration, modular design, convenient installation and replacement, simple maintenance and effective reduction of operation and maintenance cost. The method has great advantages in the aspects of performance expansion, product maintenance and stable operation of equipment.
Data acquisition, remote control and real-time monitoring. And the remote equipment is used for controlling, so that a large amount of field operation and maintenance work can be reduced, and the functions of remote communication, alarm and the like are supported. When the case door meets the condition of illegal opening, most intelligent monitoring cases can feed back the information invaded by the front-end equipment to the background in time, such as a camera, so that the safety of the monitoring case is further enhanced.
Drawings
FIG. 1 is a block diagram of modules of an embodiment of the invention;
FIG. 2 is a schematic diagram of a camera interface of an embodiment of the present invention;
FIG. 3 is a schematic diagram of an external device current analog input detection interface module;
FIG. 4 is a schematic diagram of an external device voltage analog input detection interface module;
FIG. 5 is a schematic diagram of a circuit board power restart;
FIG. 6 is a schematic diagram of AC power supply monitoring module current flow;
FIG. 7 is a schematic circuit diagram of an AC power supply monitoring module;
FIG. 8 is a schematic diagram of a DC power supply monitoring module;
FIG. 9 is a schematic diagram of controlling DC on/off in DC power monitoring;
FIG. 10 is a DC monitoring module DC detection schematic;
FIG. 11 is a schematic representation of an ACS712 connection;
FIG. 12 is a circuit schematic of the fan control module;
fig. 13 is a schematic diagram of the electrical box output power.
Detailed Description
The invention will be further elucidated with reference to the drawings and the specific embodiments.
As shown in fig. 1 and 13, an internet of things traffic electric box is internally provided with a circuit board, a power supply module, a fan and a camera; the power module comprises a 220V alternating current input alternating current leakage protector, a 220V alternating current to 24V alternating current transformer, a 220V alternating current to 12V direct current power supply and a 12V standby battery; the 220V alternating current leakage protector is used for leakage protection of the electric box, and external 220V alternating current is connected to a 24V alternating current transformer and a 12V direct current power supply after leakage protection, and respectively outputs 24V alternating current and 12V direct current; after the 220V alternating current and the 24V alternating current are subjected to on-off control of a relay of the circuit board and current value measurement of the current transformer, the 220V alternating current and the 24V alternating current are connected to a panel of the electric box to be used as power supply of external equipment; the 12V direct current is connected to the circuit board, on one hand, the circuit board is used as a working power supply of the circuit board and is connected with a power management module of the circuit board, on the other hand, the circuit board is output to a connector of the circuit board through a switching circuit and a direct current detection circuit of the circuit board, and the circuit board is conveniently used as direct current power supply of external equipment; the 12V standby battery is used as a standby power supply of the circuit board, and when the 220V power is cut off, the circuit board can work normally. The circuit board includes: the system comprises a power supply management module, an MCU (microprogrammed control unit) processor, a direct-current power supply monitoring module, an alternating-current power supply monitoring module, an NB-IOT (NB-input/output) module, a network port module, an analog input ADC (analog-to-digital converter) detection module, a GPS (global positioning system) module, a temperature and humidity sensor, a camera interface and a fan interface; the fan is connected with the MCU processor through a fan interface; a box door travel switch is arranged on the box door of the electric box; the camera interface is connected with the camera arranged at the rear part of the box door, the camera is used for shooting the state that the box door is opened or closed, and the opening person can be shot in the state that the box door is opened.
And the Internet of things traffic electronic box is in signal connection with the background server.
The 12V direct current output of the power supply module and the 12V direct current of the standby power supply respectively supply power to the MCU processor, the fan, the temperature and humidity sensor and the camera through the power supply management module; the power supply management module is used for switching a power supply, converting power supply voltage and restarting the electric box; the MCU processor is respectively connected with the direct-current power supply monitoring module, the alternating-current power supply monitoring module, the NB-IOT module, the network port module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan interface, the box door travel switch and the camera interface; the system is used for receiving input signals of a direct-current power supply monitoring module, an alternating-current power supply monitoring module, an NB-IOT module, a network port module, an analog input ADC detection module, a GPS module, a temperature and humidity sensor, a fan, a box door travel switch and a camera, sending the received input information to a background server through the network port module, and sending control signals to the direct-current power supply monitoring module, the alternating-current power supply monitoring module, the NB-IOT module, the network port module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan, the box door travel switch and the camera.
The MCU processor is STM32F407ZET6 main control chip, carries out embedded development on the chip, operates UCOSIII system, controls and data transmission to the module in the whole electric cabinet. Direct current power supply monitoring module in STM32F407ZET6 and the electronic box, alternating current power supply monitoring module, NB-IOT module, net gape module, analog input ADC detection module, GPS module, temperature and humidity sensor, fan interface, chamber door travel switch to and the pin concrete coupling of camera interface see table 1.
TABLE 1
Figure BDA0002859277150000041
Figure BDA0002859277150000051
Figure BDA0002859277150000061
The GPS module adopts a Chinese science micro module, the MCU processor communicates with the MCU processor through a serial port (TTL), the GPS module can automatically position after being electrified, and positioning information is sent to the MCU processor through the serial port according to the NMEA-0183 protocol format.
The NB-IOT module adopts a WH-NB73-BA module and carries out AT instruction communication with the MCU processor through a TTL serial port.
The camera is connected with the MCU processor through an OV2640 interface (camera interface), the MCU processor is provided with a special DCMI high-speed interface, low-delay image transmission is carried out with the camera through the OV2640 interface, specifically, the DCMI is connected with the MCU processor in fig. 2, and the camera is inserted into a connector in the drawing.
The temperature and humidity sensor adopts an SHT30 chip and is communicated with the MCU processor through the IIC, the temperature and humidity of the surrounding environment can be automatically measured after the SHT30 is electrified, the MCU processor reads the register content in the SHT30 through the IIC to obtain temperature and humidity data, and according to the size relation between the temperature and humidity data and a set value, a control signal is sent to the fan through the fan interface to control the working state of the fan.
The network port module comprises an RS232 module, an RS485 module and a 100M network module; the RS232 module adopts SP3232 to carry out voltage conversion, converts the TTL level of the MCU serial port logic signal into RS232 level, outputs the RS232 level to a connector and adapts to the butt joint of a corresponding peripheral interface.
The RS485 module adopts SP3485 to carry out voltage conversion, converts TTL level into 485 differential level signals, and outputs the 485 differential level signals to a connector, so that the RS485 module is suitable for butt joint of corresponding peripheral interfaces.
The 100M network module is a PHY chip of the LAN 8720A. STM32F407ZET6 is self-contained with a hardware MAC, so only an external PHY chip is required. The MCU STM32F407ZET6 is connected with the LAN8720A by RMII, and can realize a bandwidth of hundreds of megabits.
The analog input ADC detection module has the main functions of detecting the connection of external equipment and input analog quantity and sampling ADC for the MCU, for example, 2 groups of analog quantity ADC signals in the figure 1 comprise 2 paths of analog quantity detection, one path is current quantity detection and the other path is voltage quantity detection.
In the current amount detection, as shown in fig. 3, an external TA input current I passes through the ACS712 hall current detection chip to ground, and the circuit board and the external device are grounded together to form a loop. The ACS712 converts the current signal into a voltage signal, outputs the voltage signal via out IN fig. 3, and divides the voltage by resistors R40 and R41 to output AD _ IN1 to the ADC function pin of the MCU for analog quantity detection. The voltage division is performed because the ACS712 has no current between IP + and IP-, the VIOUT output is VCC5V (1/2) ═ 2.5V, and the ADC function of the MCU samples voltage in the range of 0-3.3V, so that the range that can be actually measured is only 3.3-2.5 ═ 0.8V, which is obviously too small, so the voltage division is performed, so that the range that can be actually measured is increased to 3.3-2.5 (1/2) × 2.05V. The actual measured range can be changed by changing the ratio of the resistances of R40 and R41.
And the other path of voltage detection, as shown IN fig. 4, directly divides the voltage analog quantity signal TV of the external device through a resistor, and outputs the voltage analog quantity signal AD _ IN2 to an ADC functional pin of the MCU for sampling detection.
And (3) detecting a door switch, specifically, detecting an on-off signal of a door travel switch arranged at the door by the MCU so as to judge whether the door is opened.
The power supply module comprises a 220V-to-12V switching power supply and a 12V output lithium battery standby power supply.
The power management module may perform the following functions: switching between a switching power supply and a standby power supply, voltage conversion and restarting of the circuit board. The switching between the switching power supply and the backup power supply is performed by switching the switching power supply and the backup battery through a PMOS tube, +12BAT backup power supply voltage, +12 represents the supply voltage of the switching power supply, when the switching power supply is powered off, VGS of the PMOS tube is-V +12BAT (1/3), the PMOS tube is turned on, the backup power supply supplies power, namely VCC12VIN is +12BAT, when the switching power supply is powered on, VG is 12V, VGS is 0, the PMOS tube is turned off, and the switching power supply supplies power, namely VCC12VIN is + 12.
The circuit board in the power management module is restarted, namely when the MCU STM32F407 sends a restart signal, the power supply of the circuit board is disconnected, and then the circuit board is automatically powered on after disconnection. As shown in fig. 5, when the MCU control signal is at a high level, the transistor Q1 is turned on, that is, the emitter and the collector of the transistor Q1 are short-circuited, and then a current flows through the coil of the relay K3, so that a magnetic field is generated, which opens the switch of the relay K3, and after the switch is opened, the circuit board is powered off, and VCC5V is 0V, at this time, since the relay K3 is of a normally closed type, the circuit board returns to an initial state after being powered off, and the switch in K3 is closed, and the circuit board is powered on. Therefore, the MCU control signal is formed to send out a high level (effective restart level), and the circuit board is electrified after power failure, so that the restart effect is presented.
The voltage conversion in the power management module, i.e. the voltage of VCC12V in fig. 5 is reduced to obtain the voltage required by the post-stage circuit: 5V, 3.3V and 3.8V. The module is mainly realized by using a special power supply chip as follows: MP2482, AMS1117-3.3, MP 2359.
The alternating current power supply monitoring module is connected in series in an alternating current loop, as shown in fig. 6; in fig. 6, L is the live line of the alternating current, and N is the zero line of the alternating current. The alternating current power supply monitoring module is connected between the live wire and the zero wire in series.
The ac power supply monitoring module is specifically shown in fig. 7, and the content shown in fig. 7 is that ac 24V passes through the ac monitoring module and is output; similarly, the 220V ac power supply monitoring module circuit is the same as that in fig. 7, and is not repeated herein, and the 24V ac is taken as an example for description. The alternating current power supply monitoring module in fig. 7 mainly comprises a relay K5 and a current transformer T2. The alternating current power supply monitoring module carries out on-off control of alternating current through a relay K5, and realizes 3.3V pin voltage control and 5V relay control of the MCU processor through an S8050 NPN triode Q6, when an MCU control signal is high level, the triode Q6 is conducted, a control pin of the relay K5 is grounded, a control side of the relay K5 is conducted, namely current flows through a coil of the relay, a magnetic field is generated, the relay switch is closed, a diode lamp of a switching indicator lamp is also conducted at the moment, and the lamp is bright; when the MCU control signal is at a low level, namely the level is 0, the triode is cut off, no current exists at the control side of the relay, and the relay switch is disconnected. The current detection is accomplished by a current transformer T2. The current exchangeThe transformation ratio of sensor T2 was 2000: 1. The controlled alternating current of 220V and 24V is I (the rated value is 2A). Then the current at the secondary side of the current transformer is IAuxiliary set(nominally 1mA), then through a sampling resistor R connected in parallel with a transformer T210Converting the current into a voltage signal, U ═ IAuxiliary set*R10The signal detected by the ADC functional pin of the MCU is the voltage signal U.
The MCU STM32F407 has 12-bit ADC sampling capability, ADC sampling is carried out on an input voltage signal U, after the MCU obtains a voltage value, the current of the secondary side of a current transformer T2 is obtained, and according to the transformation ratio of the current transformer T2 of 2000:1, the loop current I of an alternating current circuit, namely the loop current I in figure 6, is 2000IAuxiliary set。
The dc power supply monitoring module is in a dc loop connected to an external load, as shown in fig. 8; the circuit board provides direct current power supply for the external load, and the direct current power supply monitoring module is connected with the external load in series and is grounded. The direct current power supply monitoring module completes two functions: and controlling the on-off of the direct current output according to the MCU instruction to realize the current detection in the direct current loop.
The function of controlling the output of the direct current on-off through the IRF7324 in the direct current power supply monitoring module is specifically shown in fig. 9;
the control is carried out through a PMOS tube IRF7324, wherein the IRF7324 integrates two PMOS tubes, S1, G1 and D1 are respectively a source electrode, a grid electrode and a drain electrode of one PMOS tube; s2, G2, D2 are the other. One IRF7324 can control two output circuits. The circuit board includes two 12V output circuits, switching outputs 12_ OUT _1 and 12V _ OUT _2, the two 12V control circuits are the same, in addition, the control circuits of 5V and 9V are the same as those in fig. 9, and are not described herein again, and one 12V is taken as an example for description here. In fig. 9, +12 is the aforementioned switching power supply voltage, which is used as a dc output provider, i.e., a dc input. When the MCU Control signal 12V _ Control _1 is at high level, the pins 1 and 2 of the optical coupler PH1 are switched on, the LED lamp D26 is on to indicate that the LED lamp is in a controlled state at the moment, and meanwhile, the ends 3 and 4 of the optical coupler PH1 are switched on, and then R is switched on130One end of the transistor is grounded, and the voltage of the PMOS tube IRF7324 is V G112V, (2/3) × this time VG1S1When the PMOS transistor is turned on, 12V _ OUT _1 is 12V + 12V- (1/3) × 12V); when the MCU control signal is lowIf the PMOS turns off, 12V _ OUT _1 becomes 0V.
The current detection function of the dc power supply monitoring module is shown in fig. 10; the current detection is realized by a hall current detection chip ACS712, 12V _ OUT _1 output in fig. 9 is used as a chip input, and the ACS712 is connected in series in a loop, and the relationship is shown in fig. 11.
The ACS712 converts the current into a voltage signal, and the resistors R35 and R36 in fig. 10 divide the voltage signal output by the ACS712, thereby increasing the detection range, and then the MCU is connected to the ADC function pin for sampling to obtain the current.
The fan is used for heat dissipation, and the fan control circuit is the same as the control of direct current. The PMOS indicated by arrow 1 in fig. 12 controls the on/off of the fan power supply. When the NPN triode pointed by arrow 2 is conducted when the MCU control signal is high level, the emitter and the collector are equivalent to short circuit, and the V of PMOS isGS＝-R5/(R3+R5) 12V by changing R5And R3A value of such that VGSWhen the voltage is about-4.5V, the PMOS tube is conducted, and the fan is powered by 12V to rotate. When the MCU control voltage is low level, namely 0V, then VGSIf 0, the PMOS is not conducted, and the fan is powered off. This controls the turning on and off of the fan.
The monitoring of the MCU to the fan is the monitoring to the rotating speed of the fan. The adopted fan is a three-wire fan, and the rotating speed signal is an open-drain signal, so that 3.3V is added to an arrow 3 on a circuit to be pulled up (3.3V is obtained by dividing voltage of two resistors R4 and R44), and the rotating speed information can be directly obtained by monitoring the frequency of the signal through the MCU; the MCU controls the rotating speed of the fan by controlling the on-off of the PMOS to form a certain duty ratio so as to adjust the rotating speed.
The electric box MCU regularly uploads the electric box state to the server, and the content of reporting mainly includes: temperature, humidity, real-time current magnitude of each power outlet, power, and the sampled value of the analog input port. The reporting interval time of the contents is 10 s.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a thing networking traffic electronic box which characterized in that: the circuit board, the power supply module, the fan and the camera are arranged in the electric box; the circuit board includes: the system comprises a power supply management module, an MCU (microprogrammed control unit) processor, a direct-current power supply monitoring module, an alternating-current power supply monitoring module, an NB-IOT (NB-input/output) module, a network port module, an analog input ADC (analog-to-digital converter) detection module, a GPS (global positioning system) module, a temperature and humidity sensor, a camera interface and a fan interface; the fan is connected with the MCU processor through a fan interface; a box door travel switch is arranged on the box door of the electric box; the camera interface is connected with a camera arranged behind the box door; the MCU processor is communicated with the background server.
2. The internet of things transport box of claim 1, wherein: the power module comprises a 220V alternating current input alternating current leakage protector, a 220V alternating current to 24V alternating current transformer, a 220V alternating current to 12V direct current power supply and a 12V standby battery; the 220V alternating current leakage protector is used for leakage protection of the electric box, and external 220V alternating current is connected to a 24V alternating current transformer and a 12V direct current power supply after leakage protection, and respectively outputs 24V alternating current and 12V direct current; after the 220V alternating current and the 24V alternating current are subjected to on-off control of a relay of the circuit board and current value measurement of the current transformer, the 220V alternating current and the 24V alternating current are connected to a panel of the electric box to be used as power supply of external equipment; the 12V direct current is connected to the circuit board, on one hand, the circuit board is used as a working power supply of the circuit board and is connected with a power management module of the circuit board, on the other hand, the circuit board is output to a connector assembly of the circuit board through a switching circuit and a direct current detection circuit of the circuit board and is used as direct current power supply of external equipment; the 12V standby battery is used as a standby power supply of the circuit board, and when 220V is powered off, the circuit board can work normally; the 12V direct current output by the power supply module and the 12V direct current of the standby power supply respectively supply power to the MCU processor, the fan, the temperature and humidity sensor and the camera through the power supply management module; the power management module is connected with a 12V direct current and standby battery of the power module and is used for switching a power supply, converting power supply voltage and restarting an electric box; the MCU processor is respectively connected with the direct-current power supply monitoring module, the alternating-current power supply monitoring module, the NB-IOT module, the network port module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan interface, the box door travel switch and the camera interface; the MCU processor is used for receiving input signals of the DC power supply monitoring module, the AC power supply monitoring module, the NB-IOT module, the Internet access module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan, the box door travel switch and the camera, and sending the received input information to the background server through the Internet access module, and simultaneously sending control signals to the DC power supply monitoring module, the AC power supply monitoring module, the NB-IOT module, the Internet access module, the analog input ADC detection module, the GPS module, the temperature and humidity sensor, the fan, the box door travel switch and the camera.
3. The internet of things transport box of claim 1, wherein: the GPS module is electrified to send positioning information to the MCU processor; the NB-IOT module adopts a WH-NB73-BA module and carries out AT instruction communication with the MCU processor through a TTL serial port; the camera is connected with the MCU processor through an OV2640 interface; the temperature and humidity sensor adopts an SHT30 chip and sends collected temperature and humidity data to the MCU processor.
4. The internet of things transport box of claim 1, wherein: the analog input ADC detection module detects input analog quantity connected with external equipment and performs ADC sampling on the MCU processor, and comprises 2 analog quantity detection circuits, wherein one circuit is used for detecting current quantity, and the other circuit is used for detecting voltage quantity;
wherein, the current quantity is detected, the external TA inputs the current I, the current I passes through the ACS712 Hall current detection chip and reaches the ground, and the circuit board and the external equipment are grounded together to form a loop; the ACS712 converts the current signal into a voltage signal, divides the voltage by two resistors, and outputs the voltage signal to an ADC functional pin of the MCU processor for analog quantity detection;
and the other path of voltage detection is to directly divide the voltage analog quantity signal TV of the external equipment through a resistor and output the voltage analog quantity signal TV to an ADC (analog to digital converter) functional pin of the MCU processor for sampling detection.
5. The internet of things transport box of claim 1, wherein: the box door travel switch is arranged on the box door and transmits on-off signals of the box door travel switch to the MCU processor.
6. The internet of things transport box of claim 1, wherein: the power supply module comprises a 220V-to-12V switching power supply and a 12V output lithium battery standby power supply; the power management module realizes the switching between the switching power supply and the standby power supply through a PMOS tube.
7. The internet of things transport box of claim 1, wherein: the alternating current power supply monitoring module is connected in series in the alternating current loop and comprises a relay and a current transformer; the alternating current power supply monitoring module controls the on-off of alternating current through the relay, and realizes the 3.3V pin voltage control and the 5V relay control of the MCU processor through the triode, when the MCU control signal is high level, the triode is conducted, the control pin of the relay is grounded, the control side of the relay is conducted, namely current flows through a coil of the relay, a magnetic field is generated, then the relay switch is closed, and at the moment, a diode lamp of the switching indicator lamp is also conducted; when the MCU control signal is at a low level, the triode is cut off, no current exists at the control side of the relay, and the relay switch is disconnected; the current detection is completed through a current transformer; the transformation ratio of the current transformer is 2000: 1; the controlled alternating current of 220V and 24V is I, then the current of the secondary end of the current transformer is IAuxiliary setConverting the current into a voltage signal through a sampling resistor connected with the mutual inductor in parallel, wherein the signal detected by an ADC (analog to digital converter) functional pin of the MCU is the voltage signal U; and after the MCU processor obtains the voltage value, obtaining the loop current in the alternating current circuit loop.
8. The internet of things transport box of claim 1, wherein: the direct current power supply monitoring module is arranged in a direct current loop connected with an external load; the circuit board provides a direct current power supply for an external load, and the direct current power supply monitoring module is connected with the external load in series and is grounded together; the direct current power supply monitoring module completes two functions: controlling the on-off of the direct current output according to the MCU instruction to realize the current detection in the direct current loop;
the direct current power supply monitoring module controls the output direct current on-off function through an IRF7324, and the IRF7324 integrates two PMOSs;
the current detection of the dc power supply monitoring module is realized by the hall current detection chip ACS 712.
9. The internet of things transport box of claim 1, wherein: the MCU processor is an STM32F407ZET6 main control chip.
CN202023175253.2U 2020-12-25 2020-12-25 Thing networking traffic electronic box Active CN213937078U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115051179A (en) * 2022-06-06 2022-09-13 云控智行科技有限公司 Multifunctional adapter box and roadside sensing equipment box

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115051179A (en) * 2022-06-06 2022-09-13 云控智行科技有限公司 Multifunctional adapter box and roadside sensing equipment box

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