CN219812161U - Intelligent gateway based on 4G channel - Google Patents

Abstract

The utility model provides an intelligent gateway based on a 4G channel, and belongs to the technical field of power communication. The intelligent control system comprises an MCU channel and data processing module, an RS485 communication module and a 4G communication module, wherein the MCU channel and the data processing module are respectively connected with the RS485 communication module and the 4G communication module. The utility model has the functions of intelligent table searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and the like; the belt carrying capacity is strong, the structure is small and exquisite, the reliability is high, and the installation is convenient.

Description

Intelligent gateway based on 4G channel

Technical Field

The utility model provides an intelligent gateway based on a 4G channel, and belongs to the technical field of power communication.

Background

The information disclosed in the background of the utility model is only for enhancement of understanding of the general background of the utility model and is not necessarily to be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

With the development of smart grids, the application requirements of smart circuit breakers are also increasing, and thus the matching gateway is required at the same time. The intelligent gateway is an intelligent collector with edge computing capability, and is matched with intelligent switch equipment (such as a breaker, a measuring switch, a leakage reclosing and other series products) for use; the uplink communication interacts with the cloud server in a 4G mode, and the downlink communication interacts with the switch sub-equipment in an RS485 mode, so that the intelligent network communication system has the functions of intelligent meter searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and the like; the belt carrying capacity is strong, the structure is small and exquisite, the reliability is high, and the installation is convenient.

Disclosure of Invention

The intelligent gateway based on the 4G channel has the functions of intelligent table searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and the like; the belt carrying capacity is strong, the structure is small and exquisite, the reliability is high, and the installation is convenient.

The intelligent gateway based on the 4G channel comprises an MCU channel and data processing module, an RS485 communication module and a 4G communication module, wherein the MCU channel and the data processing module are respectively connected with the RS485 communication module and the 4G communication module.

And the MCU channel and the data processing module are internally provided with a clock chip.

UART communication between the RS485 communication module and the MCU channel and between the RS485 communication module and the data processing module is isolated through an isolation chip U8.

And the 4G communication module is internally provided with a Cat1 module of LCC+LGA and an LDO power supply.

The utility model has the beneficial effects that:

the utility model has the functions of intelligent table searching, file management, data acquisition, data transmission, real-time reporting, event recording, history freezing and the like; the belt carrying capacity is strong, the structure is small and exquisite, the reliability is high, and the installation is convenient.

Drawings

Fig. 1 is a schematic circuit diagram of a hardware design scheme of an intelligent gateway based on a 4G channel according to the present utility model.

Fig. 2 is a schematic circuit diagram of an MCU circuit of the 4G channel-based intelligent gateway according to the present utility model.

Fig. 3 is a schematic circuit structure diagram of the intelligent gateway based on the 4G channel.

Fig. 4 is a schematic circuit diagram of an RS485 isolation circuit diagram of the 4G channel-based intelligent gateway according to the present utility model.

Fig. 5 is a schematic circuit diagram of a 4G circuit of the 4G channel-based intelligent gateway according to the present utility model.

Fig. 6 is a schematic circuit diagram of a level conversion circuit of the intelligent gateway based on the 4G channel.

Fig. 7 is a schematic circuit diagram of a power supply filter circuit of the intelligent gateway based on the 4G channel.

Fig. 8 is a schematic circuit diagram of a SIM card circuit of the 4G channel-based intelligent gateway according to the present utility model.

Fig. 9 is a schematic circuit diagram of an antenna interface of the intelligent gateway based on the 4G channel according to the present utility model.

Detailed Description

The utility model will be further described with reference to the accompanying drawings

According to the fig. 1-9, the intelligent gateway based on the 4G channel provided by the utility model comprises an MCU channel and data processing module, an RS485 communication module and a 4G communication module, wherein the MCU channel and the data processing module are respectively connected with the RS485 communication module and the 4G communication module.

Specifically, the MCU channel and the data processing module are internally provided with clock chips.

Further detailed description: the MCU is internally provided with a clock chip, and is used as a counting clock of the RTC through an external low-speed oscillator (32.768 kHz crystal oscillator), and the clock timing is mainly obtained from a master station after the RTC is electrified, so that the normal operation of the RTC after the RTC is electrified is maintained. When the MCU is powered on, the address information of the intelligent circuit breaker is acquired through the downlink 485 channel, and the address number of the downlink equipment is judged according to the acquired address. And managing the mounted files according to the intelligent search table, managing the file addition of the newly added equipment, the file removal of the invalid equipment, the data difference inquiry among different equipment and the like. The files are stored in FLASH. Meanwhile, after file management is confirmed, the gateway accurately collects power consumption data such as voltage, current, active power, line temperature, leakage current, electric energy and the like of the intelligent switching equipment in real time, waits for inquiring or actively reporting the data, and is beneficial to electric quantity statistics, power grid quality analysis, power consumption safety and the like. And the gateway can exchange data with the local protocol in the remote protocol with different communication protocols and data formats so as to achieve the operations of network interconnection, data inquiry, parameter setting, instruction control and the like.

Specifically, UART communication between the RS485 communication module and the MCU channel and between the RS485 communication module and the data processing module is isolated through an isolation chip U8.

Further detailed description: the signals can be electrically isolated, and performance interference is avoided. The isolation chip is a 3-channel digital isolation chip, and the withstand voltage reaches 5000VRMS. The chip provides two forward isolation channels and one reverse isolation channel. The forward isolation channel transmits a UART_TX signal to the RS485 chip by the MCU, and meanwhile, the other channel is an RD signal of the RS 485. The reverse isolation channel sends a UART_RX signal to the MCU by the RS485 chip.

Because the chip is internally provided with a pull-up function, external pull-up resistors are not needed at the signal ends at both sides. The EN1 pin and the EN2 pin respectively enable the output pins, and are directly connected with the corresponding power ends at two sides without MCU control. The RS485 chip is driven by a 5V power supply. And a Fail-Safe function (Fail-Safe) is built in the chip, so that the output end of the receiver is in a logic high level state when the input end of the receiver is in an open circuit or a short circuit. The chip uses a slew-rate limited driver to significantly reduce EMI and reflections due to improper termination match cables and to achieve error-free data transmission up to 500 kbps. The input impedance of the transceiver is 1/8 unit load, and 256 transceivers can be hung on the bus at maximum, so that half-duplex communication is realized. The I/O port pin has + -15 kV IEC 61000-4-2 contact discharge protection function. The A/B interface of the RS485 chip is externally hung with a bidirectional TVS protection device TVS1, the two-way TVS of the three-port D1 is integrated through the connection of the A/B interface end to the DGND, and the output end of the A/B interface is connected with PPTC resistors F1 and F2 in series.

Specifically, the 4G communication module is internally provided with a Cat1 module of LCC+LGA and an LDO power supply.

Further detailed description: in a poor network environment, the antenna can emit at the maximum emission power, the peak current requirement of the power supply is more than 1A, and the average current requirement is less than 0.7V. The LDO output is configured to output a 4.15V power supply considering the maximum available power supply efficiency. Meanwhile, at the VCC_RF end of the 4G module power supply interface, two large-capacity tantalum capacitors C1 and C2 are added, so that the tantalum capacitors can share part of power supply capacity under the instant large-current power supply condition. Meanwhile, in order to ensure low interference of the 4G module, two filter capacitors C3 and C4 are added at the power supply end.

The LDO power supply arranged in the module changes the input power supply into 1.8V, so that the interface signal of the 4G module is 1.8V level, and level conversion is needed when the interface signal is communicated with the MCU.

MCU drives 4G module level conversion to realize switching on and shutting down, draws down PWRKEY pin and exceeds 1s then releases, makes the module start. The PWRKEY pin has built-in pull-up resistor to vcc_rf, and no pull-up resistor is required to be added externally. The MCU outputs 3.3V level high level, through triode Q5 conversion, and series divider resistor R50 between MCU's I/O mouth and triode's the base simultaneously, triode's projecting pole is connected to GND, and triode's collecting electrode is connected to 4G module's PWRKEY pin. When the triode is on, PWRKEY is connected to GND, and when the triode is off, the built-in pull-up high level output is realized. Meanwhile, a capacitor is connected in parallel between the PWRKEY pin and the GND for filtering, so that interference signals are prevented from being crossly connected to an interface end, and misoperation starting is caused.

The MCU drives the RST pin of the 4G module, and resets the 4G module under the conditions of 4G networking abnormality and the like. The RST input is low for 1s triggering a reset and the module will restart. The system is internally pulled up to 1.8V level by a pull-up resistor, and the pull-up resistor is not needed to be added outside. The RST pin is driven by the two-stage triode, so that the I/O of the MCU is consistent with the RST logic of the 4G module, and the situation that the 4G module cannot work due to reset of the 4G module and the operation such as card writing of a 4G downlink SIM card and the like caused by low level output of the I/O of the MCU when the MCU is not programmed or started is avoided. R54 resistor provides the I/O mouth pull-up drive capability of MCU, R55 is the base bleeder resistor of I/O mouth and triode, R53 is the pull-up drive resistor of the projecting pole of Q8 and Q7 base, connects in parallel a electric capacity between RST pin and the GND and carries out the filtering, prevents interference signal crosstalk to the interface end, avoids the malfunction to lead to 4G module to reset.

The UART interface of the 4G module is 1.8V matching level, and the UART interface of the MCU is 3.3V level, which needs level conversion. The TX of MCU connects RX of 4G, R49 is connected with the base of triode, the triode circuit projecting pole is unanimous with collector level logic, RX_4G connects R48 resistance pull-up level. The RX of MCU connects TX of 4G, R52 is connected with the base of triode, the triode circuit projecting pole is unanimous with collector level logic, MCU_RX connects R51 resistance pull-up level. The SIM card uses a built-in patch SIM card, an ESD protection device D2 is used on an interface of the SIM card, and resistors R45, R46 and R47 are connected in series at a signal end to avoid level mismatch and electrostatic interference.

The 4G module GNSS antenna is externally connected with the SMA connector, is connected with the passive antenna, is connected through a 0 omega resistor, and is reserved with a C31, C32 and L2 matching pi-type network.

The utility model and its embodiments have been described in terms of components which are standard components or which are known to those skilled in the art, whose construction and principle are known to those skilled in the art from technical manuals or by routine experimentation, and are not limited to the embodiments shown in the drawings, but are only one of them, without limiting the actual construction. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims (4)

1. Intelligent gateway based on 4G passageway, its characterized in that: the intelligent control system comprises an MCU channel and data processing module, an RS485 communication module and a 4G communication module, wherein the MCU channel and the data processing module are respectively connected with the RS485 communication module and the 4G communication module.

2. The 4G channel-based intelligent gateway of claim 1, wherein: and the MCU channel and the data processing module are internally provided with a clock chip.

3. The 4G channel-based intelligent gateway of claim 1, wherein: UART communication between the RS485 communication module and the MCU channel and between the RS485 communication module and the data processing module is isolated through an isolation chip U8.

4. The 4G channel-based intelligent gateway of claim 1, wherein: and the 4G communication module is internally provided with a Cat1 module of LCC+LGA and an LDO power supply.