CN109450095B

CN109450095B - Remote monitoring method for low-voltage direct-current power supply

Info

Publication number: CN109450095B
Application number: CN201811478673.2A
Authority: CN
Inventors: 江泳; 汪赐; 詹伟胜; 鲍天立; 贾永晓; 李孝纣
Original assignee: Zhejiang Yongji Intelligent Technology Co ltd
Current assignee: Zhejiang Yongji Intelligent Technology Co ltd
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2024-02-27
Anticipated expiration: 2038-12-05
Also published as: CN109450095A

Abstract

The invention discloses a remote monitoring system of a low-voltage direct-current power supply, which comprises a monitoring platform, and a plurality of acquisition modules which are connected with the monitoring platform in a communication manner and are used for transmitting the running state of the low-voltage direct-current power supply to the monitoring platform. The acquisition module comprises a data acquisition unit, a metering chip unit, a microprocessor unit, a data transmission unit, a power supply unit, a direct current output unit, a display screen unit, a physical key unit, a fault alarm unit and a switching value input detection unit. The invention also discloses a monitoring implementation method of the low-voltage direct-current power supply remote monitoring system. Through the scheme, the power supply monitoring system has the advantages of simple structure, comprehensive monitoring, reliable action and the like, and has high practical value and popularization value in the technical field of power supply monitoring.

Description

Remote monitoring method for low-voltage direct-current power supply

Technical Field

The invention relates to the technical field of power supply monitoring, in particular to a remote monitoring method for a low-voltage direct-current power supply.

Background

With the continuous development of monitoring, communication and power supply technologies, low-voltage direct current electric equipment is widely popularized. Because the low-voltage direct current electric equipment is numerous, and the equipment circuit is more complicated, most of traditional low-voltage direct current power supply monitoring adopts a manual inspection mode, and the workload is large, especially low-voltage direct current power supply equipment distributed.

Therefore, a remote monitoring method for the low-voltage direct-current power supply needs to be provided, so that the operation states of the low-voltage direct-current power supply and the monitoring equipment are remotely controlled, and the operation data are acquired.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a remote monitoring method for a low-voltage direct-current power supply, which adopts the following technical scheme:

the remote monitoring method of the low-voltage direct-current power supply comprises a monitoring platform, a plurality of acquisition modules, a plurality of monitoring modules and a control module, wherein the plurality of acquisition modules are in communication connection with the monitoring platform and are used for transmitting the running state of the low-voltage direct-current power supply to the monitoring platform, and any one of the acquisition modules comprises:

the array data acquisition unit is hung on the low-voltage direct-current power supply and used for acquiring voltage signals and current signals of the low-voltage direct-current power supply.

And the metering chip unit is of the type INA226, is connected with any group of data acquisition units, and is used for storing the voltage signals and the current signals acquired by the data acquisition units and converting the voltage signals and the current signals into digital voltage parameters and current parameters respectively.

The microprocessor unit is of a model STM32F103RCT6, is respectively connected with the array data acquisition unit and the metering chip unit and is used for extracting digital voltage parameters and current parameters stored by the metering chip unit; and judging the power supply state of the low-voltage direct-current power supply, and issuing a fault signal.

And the data transmission unit is connected with the microprocessor unit and used for transmitting data corresponding to the power supply state of the low-voltage direct-current power supply to the monitoring platform.

And the power supply unit is respectively connected with the low-voltage direct-current power switch and the microprocessor unit and is used for providing working power supply for the microprocessor unit.

And the direct current output unit is respectively connected with the power supply unit and the microprocessor unit, and is used for receiving the high and low levels issued by the microprocessor unit and driving and controlling the on and off of the low-voltage direct current power supply.

And the display screen unit is connected with the microprocessor unit and used for displaying a voltage signal and a current signal of the low-voltage direct-current power supply.

And the physical key unit is connected with the microprocessor unit and is combined with the display screen unit to realize man-machine interaction and operation.

The fault alarm unit is connected with the microprocessor unit and used for receiving fault signals issued by the microprocessor unit and

the switching value input detection unit is connected with the microprocessor unit and used for detecting the switching state of the low-voltage direct-current power supply switch.

Further, any group of data acquisition units have the same structure and comprise a voltage and current acquisition chip U2B, a capacitor C2B, a resistor R8B, a resistor R2B and a resistor R9B, wherein the SDA pin is connected with a serial port PB15 of the microprocessor unit, the SCL pin is connected with a serial port PC6 of the microprocessor unit, the model INA226 is connected between a VIN+ pin and a VIN-pin of the voltage and current acquisition chip U2B, and the resistor R8B, the resistor R2B and the resistor R9B are connected between the VIN+ pin and the VIN-pin of the voltage and current acquisition chip U2B after being connected in series; the resistor R2B is connected in series with a low-voltage direct-current power supply.

Further, the data transmission unit comprises at least one path of RS485 communication circuit, one path of RJ45 Ethernet interface circuit and one path of 2G/4G communication interface circuit which are connected with the microprocessor unit; the RS485 communication circuit, the RJ45 Ethernet interface circuit and the 2G/4G communication interface circuit are all connected with the power supply unit;

any RS485 communication circuit comprises a communication chip U10 with RO pin connected with serial port PB11 of the microprocessor unit, DI pin connected with serial port PB10 of the microprocessor unit, VCC pin connected with the power supply unit and model SP3485E, a triode Q6 with base connected on DI pin of the communication chip U10 in current limiting way through a resistor R39 and emitter grounded, a resistor R36 connected between DI pin and VCC pin of the communication chip U10, a resistor R37 connected between collector of the triode Q6 and VCC pin of the communication chip U10, a capacitor C38 with one end connected with VCC pin of the communication chip U10 and the other end grounded, a resistor R45 connected between B pin and a pin of the communication chip U10 after being connected in series, a resistor R46 and a resistor R47 with one end grounded, a resistor R48 with one end connected with a pin of the communication chip U10 and the other end grounded, and a bi-directional protection tube with one input connected between the resistor R45 and the resistor R46 and the other input connected between the resistor R46 and the resistor R47 and the output grounded;

The RJ45 Ethernet interface circuit comprises an Ethernet communication chip U7A which is connected with the microprocessor unit and is provided with a model W5500, a network port transformer U8 which is connected with the Ethernet communication chip U7A and is provided with a model H1102NL, and an RI45 interface which is connected with the network port transformer U8;

the 2G/4G communication interface circuit comprises a four-frequency GSM/GPRS module U3 which is connected with the microprocessor unit and is provided with a SIM800C, a first IPEX connector which is connected with a GSM_ANT pin of the four-frequency GSM/GPRS module U3, and a second IPEX connector which is connected with a BT_ANT pin of the four-frequency GSM/GPRS module U3.

Preferably, the power supply unit includes a dc conversion chip U1 having a VIN pin connected to a low-voltage dc power switch and having a model MP1584EN, a resistor R3 having one end connected to an FPEQ pin of the dc conversion chip U1 and the other end grounded, a capacitor C1 and a resistor R1 having one end connected to a COMP pin of the dc conversion chip U1 and the other end grounded, a capacitor C2 having one end connected to a VIN pin of the dc conversion chip U1 and the other end grounded, a resistor R6 having one end connected to an EN pin of the dc conversion chip U1 and the other end grounded, a resistor R5 connected between an EN pin and a VIN pin of the dc conversion chip U1, a capacitor C3 connected between a BST pin and a SW pin of the dc conversion chip U1, an inductor L1 and a capacitor C5 having one end connected to a ground after being connected in series, a diode D1 having an output end connected to a SW pin of the dc conversion chip U1 and having the other end grounded, a resistor R4 having one end connected to a resistor b 1 and the other end connected to a resistor R2 and the other end connected to a resistor R1.

Further, the direct current output unit comprises a darlington transistor array U8B connected with the microprocessor unit, and a plurality of direct current relays connected with the output of the darlington transistor array U8B and used for switching on and switching off a low-voltage direct current power supply.

Further, the fault alarm unit includes a resistor R22 with one end connected to the serial port PB4 of the microprocessor unit, a transistor Q3 with a base connected to the other end of the resistor R22 and an emitter grounded, and a buzzer FM1 connected between the collector of the transistor Q3 and the power supply unit.

A method for realizing remote monitoring of a low-voltage direct-current power supply comprises the following steps:

and H0, resetting and initializing the acquisition module, and setting an overvoltage threshold value, an undervoltage threshold value and an overcurrent protection threshold value of any low-voltage direct-current power supply.

And step H1, collecting voltage signals and current signals of any low-voltage direct current power supply by using a data collecting unit.

And step H2, converting the voltage signal and the current signal into digital voltage parameters and digital current parameters respectively.

And step H3, calculating the actual voltage value, the current value and the power of any low-voltage direct-current power supply, judging whether any digital actual voltage value and current value exceed the overvoltage threshold value, the undervoltage threshold value and the overcurrent protection threshold value corresponding to the low-voltage direct-current power supply, and triggering a direct-current output unit to disconnect the low-voltage direct-current power supply of the corresponding circuit by the microprocessor unit if the actual voltage value and the current value exceed the overvoltage threshold value, the undervoltage threshold value and the overcurrent protection threshold value corresponding to the low-voltage direct-current power supply.

Further, in the step H0, the resetting and initial acquisition module includes the following steps:

the hardware reset comprises the reset of a display screen unit, a physical key unit, an array data acquisition unit and a fault alarm unit.

And starting the microprocessor unit, and establishing a sending buffer annular queue for storing abnormal data to be sent to the monitoring platform.

Further, in the step H3, calculating the actual voltage value, the current value and the power of any low-voltage dc power supply includes the following steps:

step H31, reading digital voltage parameters, current parameters and power parameters stored in the metering chip unit; the digital voltage parameter and the digital current parameter are effective values; the voltage parameter is an internal voltage register value and the current parameter is a value of an internal shunt register.

Step H32, calculating an actual voltage value, a current value and a power parameter of any low-voltage direct current power supply, wherein an actual voltage value calculation expression is as follows:

Voltage＝Voltage_LSB*Voltage_register (3-1)

the Voltage is an actual Voltage value, the voltage_LSB is a single fixed parameter value of the metering chip, the value is 0.00125, and the voltage_register is an internal Voltage register value of the metering chip unit;

The expression of the actual current value of the low-voltage direct-current power supply is as follows:

the Current is an actual Current value, the ShuntVoltage is a value of an internal shunt register of the metering chip unit, and the calization register is a value of an internal calibration register of the metering chip;

the expression of the values of the internal calibration registers is:

wherein, the current_LSB is the set value of the LSB of the Current register of the metering chip unit, R _SHUNT A current sampling value corresponding to the current signal acquired by the data acquisition unit Maximum Expected Current is the maximum expected current;

calculating a power parameter according to formulas (3-1) and (3-2), expressed as:

preferably, in the step H3, it is determined whether any digital voltage parameter and current parameter exceeds an overvoltage threshold, an undervoltage threshold and an overcurrent protection threshold corresponding to the low-voltage dc power supply, including the following steps:

in step H331, the microprocessor unit extracts the actual voltage value of any low-voltage dc power supply, determines whether the actual voltage value is greater than an overvoltage threshold or greater than an undervoltage threshold, if yes, proceeds to step H332, otherwise proceeds to step H333.

Step H332, a microprocessor unit is utilized to issue a high level to a direct current output unit, a low-voltage direct current power supply of a corresponding path is disconnected, a port number and a current actual voltage value corresponding to the low-voltage direct current power supply on the direct current output unit are recorded, and the port number and the current actual voltage value are added into a buffer annular queue; and transmitting the port number in the buffer annular queue and the current actual voltage value to a monitoring platform by using the data transmission unit.

Step H333, judging whether the actual current value of the low-voltage direct-current power supply is greater than an overcurrent protection threshold value, if yes, entering step H334; otherwise, step H335 is entered.

Step H334, a microprocessor unit is utilized to send high level to a direct current output unit, a low-voltage direct current power supply of a corresponding path is disconnected, a port number and a current actual current value corresponding to the low-voltage direct current power supply on the direct current output unit are recorded, and the port number and the current actual current value are added into a buffer annular queue; and transmitting the port number in the buffer annular queue and the current actual current value to a monitoring platform by using the data transmission unit.

Step H335, the microprocessor unit judges whether the ratio of the effective value of the current actual voltage value to the effective value of the actual current value is larger than the ratio of the effective value of the actual voltage value to the effective value of the actual current value at the moment before the low-voltage direct-current power supply; if yes, go to step H336; if the difference is smaller than the preset value, the step H337 is entered; if equal, go to step H338.

Step H336, calculating the current fluctuation percentage Fluctuating value of the voltage and the current, which is expressed as:

Fluctuating value＝(VALUE_NEW–VALUE_OLD)*100/VALUE

_OL(3-6)

wherein, value_new is the ratio of the effective VALUE of the current actual voltage VALUE to the effective VALUE of the actual current VALUE, and value_old is the ratio of the effective VALUE of the actual voltage VALUE to the effective VALUE of the actual current VALUE at the previous moment;

And adding a port number corresponding to the low-voltage direct-current power supply and the fluctuation percentage Fluctuating value of the voltage and the current into a buffer annular queue, and sending the buffer annular queue to a monitoring platform.

Step H337, calculating the current fluctuation percentage Fluctuating value of the voltage and the current, which is expressed as:

Fluctuating value＝(VALUE_OLD–VALUE_NEW)*

100/VALUE_NEW(3-7)

And step H338, the microprocessor unit reads the feedback value of the switching of the low-voltage direct-current power supply detected by the switching value input detection unit and sends the feedback value to the monitoring platform.

Compared with the prior art, the invention has the following beneficial effects:

the invention skillfully sets the data acquisition unit to acquire the voltage signal and the current signal of the low-voltage direct-current power supply, and stores the acquired voltage signal and current signal into the metering chip unit. The invention utilizes the microprocessor unit to extract the voltage parameter and the current parameter at any moment, compares the voltage parameter and the current parameter with an overvoltage threshold value, an undervoltage threshold value and an overcurrent protection threshold value, confirms the fault type, and sends the port number of the fault low-voltage direct-current power supply and the fault voltage or current to the monitoring platform. In addition, the invention realizes the trend change monitoring of the power supply state by judging the fluctuation percentage of the low-voltage direct-current power supply for normal power supply. If and only if any low voltage DC power source fails, the failure loop is cut off through the DC output unit. In order to ensure reliable data acquisition by the data acquisition unit, the switching state of the low-voltage direct-current power supply switch is detected by the switching value input detection unit, so that the monitoring of the multi-loop low-voltage direct-current voltage running state is realized. Through the scheme, the power supply monitoring system has the advantages of simple structure, comprehensive monitoring, reliable action and the like, and has high practical value and popularization value in the technical field of power supply monitoring.

Drawings

For a clearer description of the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope of protection, and other related drawings may be obtained according to these drawings without the need of inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic circuit diagram of a microprocessor unit and a fault alarm unit of the present invention.

Fig. 3 is a schematic circuit diagram of the power supply unit of the present invention.

Fig. 4 is a schematic circuit diagram of a physical key unit according to the present invention.

Fig. 5 is a schematic diagram of a 2G/4G communication interface circuit according to the present invention.

Fig. 6 is a schematic circuit diagram of the dc output unit of the present invention.

Fig. 7 is a schematic circuit diagram of a data acquisition unit according to the present invention.

Fig. 8 is a schematic circuit diagram of a metering chip unit of the present invention.

Fig. 9 is a schematic diagram of a temperature and humidity acquisition circuit according to the present invention.

Fig. 10 is a schematic diagram of an LCD display circuit according to the present invention.

Fig. 11 is a schematic diagram of an RS485 communication circuit according to the invention.

FIG. 12 is a schematic diagram of a 2G/4G communication interface circuit according to the present invention.

Fig. 13 is a schematic diagram of an RJ45 ethernet interface circuit according to the present invention (i).

Fig. 14 is a schematic diagram of an RJ45 ethernet interface circuit according to the present invention (ii).

FIG. 15 is a timing diagram of a communication protocol frame between a microprocessor unit and a microchip unit according to the present invention.

FIG. 16 is a timing diagram illustrating the read of a communication protocol frame between a microprocessor unit and a microchip unit according to the present invention.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the present invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

Examples

As shown in fig. 1 to 14, the embodiment provides a remote monitoring method for a low-voltage dc power supply, which comprises a monitoring platform, a plurality of acquisition modules connected with the monitoring platform in a communication manner and used for transmitting the running state of the low-voltage dc power supply to the monitoring platform, wherein any one of the acquisition modules comprises an array data acquisition unit which is hung on the low-voltage dc power supply and used for acquiring the voltage signal and the current signal of the low-voltage dc power supply, a metering chip unit which is connected with any one of the data acquisition units, used for storing the voltage signal and the current signal acquired by the data acquisition unit and respectively converting the voltage signal and the current signal into digital voltage parameters and the current parameters and is of the type INA226, an STM32F103RCT6 microprocessor unit which is respectively connected with the array data acquisition unit and the metering chip unit and used for extracting the digital voltage parameters and the current parameters stored by the metering chip unit and judging the power supply state of the low-voltage dc power supply and issuing fault signals, the system comprises a microprocessor unit, a data transmission unit corresponding to the power supply state of the low-voltage direct current power supply, a power supply unit, a direct current output unit, a display screen unit, a physical key unit, a fault alarm unit and a control unit, wherein the data transmission unit is connected with the microprocessor unit and is used for transmitting the power supply state of the low-voltage direct current power supply to a monitoring platform, the power supply unit is respectively connected with a low-voltage direct current power supply switch and the microprocessor unit and is used for providing working power supply for the microprocessor unit, the direct current output unit is respectively connected with the power supply unit and the microprocessor unit and is used for receiving the high and low levels issued by the microprocessor unit to drive and control the closing and opening of the low-voltage direct current power supply, the display screen unit is connected with the microprocessor unit and is used for displaying the voltage signal and the current signal of the low-voltage direct current power supply, the physical key unit is connected with the microprocessor unit and is combined with the display screen unit to realize man-machine interaction and operation, the fault alarm unit is connected with the microprocessor unit and is used for receiving fault signal issued by the microprocessor unit, and the switching value input detection unit is connected with the microprocessor unit and used for detecting the switching state of the low-voltage direct-current power supply switch.

In this embodiment, the microprocessor unit and the metering chip unit pass through the write timing logic and the read timing logic of the IIC bus communication protocol, as shown in fig. 15 and 16, the IIC serial bus includes a data line SDA and a clock line SCL. The procedure for writing the single metering chip calibration register is exemplified as follows: the current sampling circuit ua calculates a calibration value CLA (16 bits). When the IIC bus is idle, the SDA and SCL lines are pulled high By the pull-up device, the master device generates a Start condition Start By (Start bit) via the serial buses SDA and SCL, and the first frame data (8 bits) is sent to include the slave device's 7-bit physical address (high 7 bits) determined By the physical level to which the A0, A1 pins of the metering chip are connected, and the 1-bit read/write bits (low bits, 1 stands for read, and 0 stands for write). If the physical address is correctly sent, the slave device will respond to an ACK By bit, then the master device sends second frame data (8 bits) P0-P7 as the metering chip calibration register address, and similarly, the slave device will respond to an ACK By bit after receiving. The master device then transmits the calibration value CLA (16 bits), and the third frame data (8 bits) D8-D15 is the upper 8 bits of CLA, and similarly, the slave device will respond to an acknowledgement bit ACK By after receiving. The fourth frame data (8 bits) D0-D7 is the lower 8 bits of CLA, the slave device will respond an acknowledgement bit ACK By after receiving, and finally the master device generates a Stop By, the calibration is completed, and the slave device is informed to end the communication. The master device is a microprocessor unit a10, and the slave device is a metering chip unit A1. Since the other register flows of the write metering chip are similar to those described above, they will not be described in detail. When the IIC bus is idle, the master device generates a Start condition Start By (Start bit) through the serial buses SDA, SCL, and then sends the first frame data (8 bits) including the 7-bit physical address (high 7 bits) of the slave device, where the physical address is determined By the physical level connected to the A0, A1-bit read-write bit (low bit, 1 represents read, and 0 represents write) of the metering chip, if the physical address is sent correctly, the slave device will respond to a response bit ACK By after receiving, and it should be noted that if the currently read register address is not the last written or read register address, the register address needs to be resent, and the sending method is the same as the above calibration flow, so that it will not be described. The slave device will then first return the upper 8 bits (second frame data) D8-D15 of the 16-bit current data, and the host device will then return the lower 8 bits (third frame data) D0-D7 of the 16-bit current data in response to an acknowledgement bit ACK By after reception is completed. After the main device receives the current, a Stop condition Stop By is generated, and the current reading is completed. The slave device is notified to end the communication. The master device is a microprocessor unit a10, and the slave device is a metering chip unit A1. Since the flow of other registers of the read metering chip is similar to that described above, it will not be described in detail.

The following briefly describes a schematic structural diagram of each unit of the acquisition module. The data acquisition unit comprises a voltage and current acquisition chip U2B, a capacitor C2B, a resistor R8B, a resistor R2B and a resistor R9B, wherein the SDA pin is connected with a serial port PB15 of the microprocessor unit, the SCL pin is connected with a serial port PC6 of the microprocessor unit, the model INA226 is connected between a VIN+ pin and a VIN-pin of the voltage and current acquisition chip U2B, and the resistor R8B, the resistor R2B and the resistor R9B are connected between a VIN+ pin and a VIN-pin of the voltage and current acquisition chip U2B after being connected in series. The resistor R2B is connected in series with a low-voltage direct current power supply. The data acquisition unit comprises a current/voltage sampling circuit, wherein the current sampling circuit consists of a sampling resistor R2B, and the voltage sampling circuit consists of a capacitor C3. The collected voltage and current signals are converted into digital voltage parameters and digital current parameters by an ADC (analog-to-digital converter) in the metering chip, wherein the ADC is converted into the prior art, and the description is omitted herein. In this embodiment, the dc output unit includes a darlington transistor array U8B connected to the microprocessor unit, and several dc relays connected to the outputs of the darlington transistor array U8B for switching on and off the low voltage dc power supply. The microprocessor unit cuts off the direct current relay corresponding to the fault circuit by issuing high level so as to realize fault removal. Meanwhile, a high level is issued to the fault alarm unit through the microprocessor unit to realize fault alarm, wherein the fault alarm unit comprises a resistor R22 with one end connected with a serial port PB4 of the microprocessor unit, a triode Q3 with a base connected with the other end of the resistor R22 and a grounded emitter, and a buzzer FM1 connected between a collector of the triode Q3 and a power supply unit.

Meanwhile, in order to obtain direct current 4.2V and 3.3V direct current power supply, a power supply unit is skillfully provided, which comprises a direct current conversion chip U1 with VIN pin connected with a low voltage direct current power switch and model MP1584EN, a resistor R3 with one end connected with an FPEQ pin of the direct current conversion chip U1 and the other end grounded, a capacitor C1 and a resistor R1 with the other end grounded connected with COMP pin of the direct current conversion chip U1 after being connected in series, a capacitor C2 with one end connected with VIN pin of the direct current conversion chip U1 and the other end grounded connected with C2, a resistor R5 with one end connected with EN pin of the direct current conversion chip U1 and the other end grounded, a capacitor C3 connected between BST pin of the direct current conversion chip U1 and SW pin, an inductor L1 and a capacitor C5 with the other end grounded after being connected in series, an inductor D1 and a capacitor C5 with the other end connected with SW pin of the direct current conversion chip U1, an inductor D1 and a resistor D1 with the other end connected with FB pin of the direct current conversion chip U1 and the other end grounded, and a resistor R4 connected between the other end of the direct current conversion chip U1 and the resistor R1.

In this embodiment, in order to cope with installation and use in various environments, the data transmission unit includes at least one path of RS485 communication circuit, one path of RJ45 ethernet interface circuit and one path of 2G/4G communication interface circuit connected with the microprocessor unit; and the RS485 communication circuit, the RJ45 Ethernet interface circuit and the 2G/4G communication interface circuit are all connected with the power supply unit. The RS485 communication circuit comprises a communication chip U10, a triode Q6, a resistor R36, a resistor R37 and a capacitor C38, wherein the RO pin is connected with a serial port PB11 of a microprocessor unit, the DI pin is connected with a serial port PB10 of the microprocessor unit, the VCC pin is connected with a power supply unit, the model is SP3485E, the base electrode is connected to the DI pin of the communication chip U10 in a current limiting way through a resistor R39, the emitter electrode is grounded, the resistor R36 is connected between the DI pin and the VCC pin of the communication chip U10, the resistor R37 is connected between the collector electrode of the triode Q6 and the VCC pin of the communication chip U10, one end of the resistor R37 is connected with the VCC pin of the communication chip U10, the other end of the resistor C38 is grounded, the resistor R45, the resistor R46 and the resistor R47 are connected between the B pin and the A pin of the communication chip U10 after being connected in series, the other end of the resistor R38 is grounded, the resistor R48 is connected with the A pin of the communication chip U10, the other end of the resistor is grounded, and the resistor R9 is connected between the resistor R45 and the output of the resistor is grounded. Meanwhile, the RJ45 ethernet interface circuit includes an ethernet communication chip U7A connected to the microprocessor unit and having a model W5500, a network port transformer U8 connected to the ethernet communication chip U7A and having a model H1102NL, and an RI45 interface connected to the network port transformer U8. In addition, the 2G/4G communication interface circuit comprises a four-frequency GSM/GPRS module U3 which is connected with the microprocessor unit and is provided with a SIM800C, a first IPEX connector which is connected with a GSM_ANT pin of the four-frequency GSM/GPRS module U3, and a second IPEX connector which is connected with a BT_ANT pin of the four-frequency GSM/GPRS module U3.

Briefly described below, the 2G/4G and RJ45 Ethernet port telecommunications protocols are shown in the following table:

name of the name

BOF

CRC16

LENGTH

FALG

CMD

DATA

EOF

Number of bytes

1

2

1

Variable

1

Value taking

0xBD

Custom

0x01

Custom

0xDB

Remarks

Frame header

Packet verification

Pack length

Encryption

Bag type

Data

Frame end

The 1 st byte BOF is the frame header 0xBD, the 2 nd and 3 rd bytes are CRC16 high and low bit check, the 4 th and 5 th bytes LENGTH are the data high and low bit LENGTH, the 6 th byte FALG is the encryption identification, and the 7 th byte CMD is the command identification number. The 8 th byte DATA starts to be a variable length DATA portion. The last byte EOF is frame tail 0xDB.

In addition, the specific content of the DATA segment is as follows:

name of the name

COUNT

CH1

CH2

CH3

CH4

CH5

CH6

Bytes

1

7

Remarks

Number of channels

Channel 1 data

Channel 2 data

Channel 3 data

Channel 4 data

Channel 5 data

Channel 6 data

The acquisition module in the remote communication protocol uploads DATA segments, and when CMD is decimal 28, channel voltage and current DATA are represented. The variable length data portion format is defined as follows, with byte 1 being channel number 6. Byte 2 begins with the voltage, current data for channel 1. Each channel data length is 7 bytes.

Meanwhile, the channel is set as follows:

the 1 st byte is a channel number 1, the 2 nd byte is a channel type value 1, the direct current channel is represented, the 3 rd byte and the 4 th byte are voltage high and low values on the channel, the 5 th byte and the 6 th byte are current high and low values on the channel, the 7 th byte is a channel state, wherein the 1 st bit represents overvoltage, the 2 nd bit represents undervoltage, the 3 rd bit represents overcurrent, the 4 th bit represents electric leakage (an external intelligent sensor can only use the bit), the 5 th bit represents channel hardware fault, the 6 th bit represents the direct current channel, the 7 th bit represents the current channel is switched on or off, and the 8 th bit represents whether IIC protocol communication is normal or not. Bytes 8 to 14 are the voltage and current data of the 2 nd channel. The 15 th byte to 21 st byte are the voltage and current data of the 3 rd channel. Bytes 22 to 28 are the voltage and current data of the 4 th channel. The 29 th byte to the 35 th byte are the voltage and current data of the 5 th channel. Bytes 36 to 42 are voltage and current data of the 6 th channel.

The following briefly describes a method for implementing remote monitoring of a low-voltage direct-current power supply, which comprises the following steps:

and H0, resetting and initializing the acquisition module, and setting an overvoltage threshold value, an undervoltage threshold value and an overcurrent protection threshold value of any low-voltage direct-current power supply. Specifically, the hardware reset includes the reset of the display screen unit, the physical key unit, the array data acquisition unit and the fault alarm unit. And starting the microprocessor unit, and establishing a sending buffer annular queue for storing abnormal data to be sent to the monitoring platform.

And step H1, collecting voltage signals and current signals of any low-voltage direct current power supply by using a data collecting unit. In this embodiment, the sampling unit collects the monitored instantaneous voltage and current analog signals of the power output port. The sampling unit converts the monitored instantaneous voltage and current analog signals of the power output port into analog signals in a metering range required by the metering chip. The sampling unit transmits the converted analog signals to the metering chip unit.

And H2, converting the voltage signal and the current signal into digital voltage parameters and digital current parameters respectively by the metering chip unit.

Specifically, calculating the actual voltage value, current value and power of any low-voltage direct current power supply, including the following steps:

Voltage＝Voltage_LSB*Voltage_register (3-1)

the expression of the values of the internal calibration registers is:

in this embodiment, determining whether any digital voltage parameter and current parameter exceeds an overvoltage threshold, an undervoltage threshold, and an overcurrent protection threshold corresponding to the low-voltage dc power supply includes the following steps:

Fluctuating value＝(VALUE_NEW–VALUE_OLD)*100/VALUE

_OL(3-6)

Fluctuating value＝(VALUE_OLD–VALUE_NEW)*

100/VALUE_NEW(3-7)

In this embodiment, the microprocessor unit monitors the data transmission unit in real time that no data is transmitted, and when receiving the data of the monitoring platform, the microprocessor unit controls the dc output unit to turn off or turn on the power output port currently required to be controlled through the relay, and feeds back the operation result to the monitoring platform. When an output port is over-current, the over-current protection mechanism is set according to the design requirement of the maximum load of the channel line, the over-current protection threshold value is set to 3000 milliamperes, the number of times of over-current superposition is 3, and each time is respectively 10 seconds, 30 seconds and 60 seconds. When the collected current exceeds the protection threshold value, the channel switch is immediately disconnected, the electric equipment under the fault channel is isolated, and meanwhile, the counting unit increases the overcurrent count. The retry will not be in progress after the number of coincidence times reaches 3, keeping the end member port open all the time. The microprocessor unit controls abnormal data of the data transmission unit to be sent to the monitoring platform to inform maintenance personnel of processing faults, after the maintenance personnel is expected to remove the faults, the monitoring platform can confirm the fault removal and reopen the channel, and meanwhile, the counting unit clears the overcurrent count. Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and has wide market prospect in the technical field of power supply monitoring.

The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention, but all changes made by adopting the design principle of the present invention and performing non-creative work on the basis thereof shall fall within the scope of the present invention.

Claims

1. The utility model provides a low voltage direct current power supply remote monitoring method, includes the monitor platform, is connected with monitor platform communication, is used for to the several collection module of monitor platform transmission low voltage direct current power supply running state, its characterized in that, arbitrary collection module includes:

the array data acquisition unit is hung on the low-voltage direct-current power supply and is used for acquiring voltage signals and current signals of the low-voltage direct-current power supply;

the metering chip unit is of the type INA226, is connected with any group of data acquisition units, and is used for storing the voltage signals and the current signals acquired by the data acquisition units and converting the voltage signals and the current signals into digital voltage parameters and digital current parameters respectively;

the microprocessor unit is of a model STM32F103RCT6, is respectively connected with the array data acquisition unit and the metering chip unit and is used for extracting digital voltage parameters and current parameters stored by the metering chip unit; judging the power supply state of the low-voltage direct-current power supply, and issuing a fault signal;

The data transmission unit is connected with the microprocessor unit and used for transmitting data corresponding to the power supply state of the low-voltage direct-current power supply to the monitoring platform;

the power supply unit is respectively connected with the low-voltage direct-current power switch and the microprocessor unit and is used for providing working power supply for the microprocessor unit;

the direct current output unit is respectively connected with the power supply unit and the microprocessor unit, and is used for receiving the high and low levels issued by the microprocessor unit and driving and controlling the on and off of the low-voltage direct current power supply;

the display screen unit is connected with the microprocessor unit and used for displaying a voltage signal and a current signal of the low-voltage direct-current power supply;

the physical key unit is connected with the microprocessor unit and combined with the display screen unit to realize man-machine interaction and operation;

the switching value input detection unit is connected with the microprocessor unit and used for detecting the switching state of the low-voltage direct-current power supply switch;

the method for realizing remote monitoring of the low-voltage direct-current power supply comprises the following steps:

step H0, resetting and initializing a collection module, and setting an overvoltage threshold value, an undervoltage threshold value and an overcurrent protection threshold value of any low-voltage direct-current power supply;

Step H1, collecting voltage signals and current signals of any low-voltage direct current power supply by using a data collecting unit;

step H2, converting the voltage signal and the current signal into digital voltage parameters and digital current parameters respectively;

step H3, calculating the actual voltage value, current value and power of any low-voltage direct-current power supply, judging whether any digital actual voltage value and current value exceed the overvoltage threshold value, the undervoltage threshold value and the overcurrent protection threshold value corresponding to the low-voltage direct-current power supply, and triggering a direct-current output unit to disconnect the low-voltage direct-current power supply of the corresponding path by the microprocessor unit if the actual voltage value and the current value exceed the overvoltage threshold value, the undervoltage threshold value and the overcurrent protection threshold value corresponding to the low-voltage direct-current power supply;

in the step H3, calculating an actual voltage value, a current value and power of any low-voltage dc power supply, including the following steps:

step H31, reading digital voltage parameters, current parameters and power parameters stored in the metering chip unit; the digital voltage parameter and the digital current parameter are effective values; the voltage parameter is an internal voltage register value, and the current parameter is a numerical value of an internal shunt register;

Voltage ＝ Voltage_LSB * Voltage_register (3-1)

the expression of the values of the internal calibration registers is:

wherein, the current_LSB is the set value of the LSB of the Current register of the metering chip unit, R _SHUNT A current sampling value corresponding to the current signal acquired by the data acquisition unit,

maximum Expected Current is the maximum expected current;

2. the method for remotely monitoring a low-voltage direct-current power supply according to claim 1, wherein any group of data acquisition units have the same structure and comprise a voltage and current acquisition chip U2B, a capacitor C2B, a resistor R8B, a resistor R2B and a resistor R9B, wherein the SDA pin is connected with a serial port PB15 of a microprocessor unit, the SCL pin is connected with a serial port PC6 of the microprocessor unit, the voltage and current acquisition chip U2B is of a model INA226, the capacitor C2B is connected between a VIN+ pin and a VIN-pin of the voltage and current acquisition chip U2B, and the resistor R8B, the resistor R2B and the resistor R9B are connected between the VIN+ pin and the VIN-pin of the voltage and current acquisition chip U2B after being connected in series; the resistor R2B is connected in series with a low-voltage direct-current power supply.

3. The method for remotely monitoring a low-voltage direct-current power supply according to claim 2, wherein the data transmission unit comprises at least one path of RS485 communication circuit, one path of RJ45 Ethernet interface circuit and one path of 2G/4G communication interface circuit which are connected with the microprocessor unit; the RS485 communication circuit, the RJ45 Ethernet interface circuit and the 2G/4G communication interface circuit are all connected with the power supply unit;

4. The remote monitoring method of a low-voltage dc power supply according to claim 1, wherein the power supply unit includes a dc conversion chip U1 having a VIN pin connected to the low-voltage dc power supply switch and a model MP1584EN, a resistor R3 having one end connected to the FPEQ pin of the dc conversion chip U1 and the other end grounded, a capacitor C1 and a resistor R1 having one end connected to the COMP pin of the dc conversion chip U1 and the other end grounded, a capacitor C2 having one end connected to the VIN pin of the dc conversion chip U1 and the other end grounded, a resistor R6 having one end connected to the EN pin of the dc conversion chip U1 and the other end grounded, a capacitor C3 having one end connected to the BST pin of the dc conversion chip U1 and the SW pin, an inductor L1 and a capacitor C5 having one end connected to the SW pin of the dc conversion chip U1 and the other end grounded, a diode D1 and the other end connected to the resistor R1 and the other end of the dc conversion chip U1 and the resistor R5 connected between the EN pin of the dc conversion chip U1 and the other end grounded.

5. A method of remote monitoring of a low voltage dc power supply according to claim 3 or 4, characterized in that the dc output unit comprises a darlington transistor array U8B connected to the microprocessor unit, and a number of dc relays connected to the outputs of the darlington transistor array U8B for switching on and off the power supply of the low voltage dc power supply.

6. The remote monitoring method of a low voltage dc power supply according to claim 1, wherein the fault alarm unit comprises a resistor R22 having one end connected to a serial port PB4 of the microprocessor unit, a transistor Q3 having a base connected to the other end of the resistor R22 and an emitter grounded, and a buzzer FM1 connected between a collector of the transistor Q3 and the power supply unit.

7. The method for remotely monitoring a low voltage dc power supply according to claim 1, wherein in the step H0, the resetting and initial acquisition module comprises the steps of:

hardware reset, including reset of display screen unit, physical key unit, array data acquisition unit and fault alarm unit;

8. The method for remotely monitoring a low-voltage dc power supply according to claim 1, wherein in the step H3, it is determined whether any digital voltage parameter and current parameter exceeds an overvoltage threshold, an undervoltage threshold and an overcurrent protection threshold corresponding to the low-voltage dc power supply, and the method comprises the following steps:

step H331, the microprocessor unit extracts the actual voltage value of any low-voltage direct current power supply, judges whether the actual voltage value is larger than an overvoltage threshold value or larger than an undervoltage threshold value, if yes, enters step H332, otherwise, enters step H333;

step H332, a microprocessor unit is utilized to issue a high level to a direct current output unit, a low-voltage direct current power supply of a corresponding path is disconnected, a port number and a current actual voltage value corresponding to the low-voltage direct current power supply on the direct current output unit are recorded, and the port number and the current actual voltage value are added into a buffer annular queue; transmitting the port number in the buffer annular queue and the current actual voltage value to a monitoring platform by utilizing the data transmission unit;

step H333, judging whether the actual current value of the low-voltage direct-current power supply is greater than an overcurrent protection threshold value, if yes, entering step H334; otherwise, enter step H335;

Step H334, a microprocessor unit is utilized to send high level to a direct current output unit, a low-voltage direct current power supply of a corresponding path is disconnected, a port number and a current actual current value corresponding to the low-voltage direct current power supply on the direct current output unit are recorded, and the port number and the current actual current value are added into a buffer annular queue; transmitting the port number in the buffer annular queue and the current actual current value to a monitoring platform by utilizing the data transmission unit;

step H335, the microprocessor unit judges whether the ratio of the effective value of the current actual voltage value to the effective value of the actual current value is larger than the ratio of the effective value of the actual voltage value to the effective value of the actual current value at the moment before the low-voltage direct-current power supply; if yes, go to step H336; if the difference is smaller than the preset value, the step H337 is entered; if so, go to step H338;

Fluctuating value＝(VALUE_NEW–VALUE_OLD)*100/VALUE_OL(3-6)

Adding a port number corresponding to the low-voltage direct-current power supply and the fluctuation percentage Fluctuating value of voltage and current into a buffer annular queue, and sending the buffer annular queue to a monitoring platform;

Fluctuating value＝(VALUE_OLD–VALUE_NEW)*

100/VALUE_NEW(3-7)