Intrinsic safety power supply parameter information acquisition device for mining monitoring substation

Abstract

The invention discloses a mining monitoring substation intrinsic safety power supply parameter information acquisition device, which comprises an intrinsic safety power supply acquisition module, a monitoring substation mainboard MCU (Microprogrammed Control Unit) unit, a voltage acquisition unit, a photoelectric isolation unit and a transformer power supply isolation unit, the transformer power supply isolation unit is connected with the intrinsic safety power supply acquisition module and provides an isolation power supply for the intrinsic safety power supply acquisition module, the voltage acquisition unit acquires input voltage of an intrinsic safety power supply, and the voltage acquisition unit is connected with the intrinsic safety power supply acquisition module and outputs acquired voltage signals to the intrinsic safety power supply acquisition module. The intrinsically safe power supply acquisition module performs analog-to-digital conversion on a voltage signal and converts the voltage signal into a current signal, the optoelectronic isolation unit performs optical coupling isolation on the signal, and the intrinsically safe power supply acquisition module passes through the optoelectronic isolation unit and then is connected with the monitoring substation mainboard MCU unit to realize data communication. According to the invention, accurate acquisition of voltage and current parameters of the intrinsic safety power supply is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal mine safety monitoring, and particularly relates to a kind of mine monitoring substation intrinsic safety power parameter information acquisition devices. BACKGROUND

[0002] In the coal mine safety monitoring system, the existing monitoring substation power supply can usually only collect parameters such as power supply AC / DC state, battery charging / discharging state and battery voltage, and the design scheme is mainly used to solve the remote monitoring of intrinsic safety power supply state, backup battery state and AC power supply state. However, with the continuous progress of coal mine safety production technology and the increasing requirements of customers for the functions of the monitoring system, more detailed state parameter collection of the intrinsic safety power supply of the mine monitoring substation becomes crucial. Accurate collection of voltage and current parameters of each intrinsic safety power supply and conversion of the collected information into real-time energy consumption for real-time display not only enables effective monitoring of the real-time energy consumption of the intrinsic safety power supply, but also provides accurate data basis for the monitoring master station to accurately judge the real-time energy consumption of the entire device, and helps to guide the reasonable number of intrinsic safety power supply equipment. In addition, while realizing new functions, the original power information collection function of the monitoring substation mainboard needs to be retained. However, the existing technology has deficiencies in this regard and cannot meet the above new functional requirements. SUMMARY

[0003] The present application aims to provide a kind of mine monitoring substation intrinsic safety power parameter information acquisition device, through the optimization design and function extension of mine monitoring substation mainboard, realize the accurate collection of intrinsic safety power voltage and current parameters, retain the original power information collection function, and provide more comprehensive and accurate power state information for the coal mine safety monitoring system.

[0004] The purpose of the present application is achieved by the following technical solution:

[0005] A kind of mine monitoring substation intrinsic safety power parameter information acquisition device, including intrinsic safety power acquisition module, monitoring substation mainboard MCU unit, voltage acquisition unit, optoelectronic isolation unit, transformer power isolation unit, the transformer power isolation unit converts 3.3V power supply into isolated power supply S3.3V, the transformer power isolation unit is connected with intrinsic safety power acquisition module, provides isolated power supply for intrinsic safety power acquisition module, the voltage acquisition unit collects the input voltage of intrinsic safety power supply, the voltage acquisition unit is connected with intrinsic safety power acquisition module, and the voltage signal collected is output to intrinsic safety power acquisition module, intrinsic safety power acquisition module carries out analog-digital conversion to voltage signal, and obtains current signal by converting voltage signal, the optoelectronic isolation unit carries out photoelectric isolation to signal, intrinsic safety power acquisition module is connected with monitoring substation mainboard MCU unit after passing through optoelectronic isolation unit, realizes data communication.

[0006] The object of the present application can also be further achieved by the following technical measures:

[0007] The voltage acquisition unit is connected to the input end of the intrinsically safe power supply of the monitoring substation mainboard, and the voltage at one end of the sampling resistor is taken as the input voltage of the intrinsically safe power supply.

[0008] The voltage difference V1-V2=△V between the two ends of the sampling resistor is calculated, and the real-time current is calculated by the formula I=△V / R to perform current sampling, and R is the sampling resistor value.

[0009] The photoelectric isolation unit adopts EL3H7 type optocoupler U2 and EL3H7 type optocoupler U3 for isolation to realize data communication; U2 is connected to the TX2 pin of the intrinsically safe power supply acquisition module MCU, U3 is connected to the PA15 pin of the intrinsically safe power supply acquisition module MCU, and after the monitoring substation mainboard MCU pulls down the level of the CTR control signal through the optocoupler U3, PA15 pulls up the level, controls the TX2 pin to send data, and the TX2 pin of the intrinsically safe power supply acquisition module MCU outputs the signal OUT to the monitoring substation mainboard MCU after isolation through the U2 optocoupler.

[0010] The transformer power supply isolation unit adopts MX6505 as a transformer driver and MXPP6-3K6110 as an isolation transformer, and the input power is output to the isolation transformer through the transformer driver, and the isolation transformer outputs an isolated power supply.

[0011] Compared with the prior art, the present application has the following advantages:

[0012] 1. The present application realizes accurate acquisition of intrinsically safe power supply voltage and current parameters, and compared with the prior art, can provide more detailed and accurate power supply state information for the coal mine safety monitoring system, and help the monitoring master station to more accurately judge the real-time energy consumption of the whole machine device.

[0013] 2. By processing the acquired voltage and current parameters, the actual output power of the intrinsically safe power supply and the sustainable power supply time of the backup battery can be calculated in real time, which provides an important basis for decision-making for decision-makers, facilitates timely adjustment of the operation strategy of the monitoring substation, and ensures the safety production of coal mines.

[0014] 3. The modular design idea is adopted, the intrinsically safe power supply acquisition module is welded on the mining monitoring substation mainboard, the structure is compact, easy to install and maintain, and the original power supply information acquisition function is retained, which does not affect the normal operation of the original system, and has good compatibility and expansibility.

[0015] 4. In the hardware design, multiple isolation technologies such as power supply isolation and data communication isolation are adopted, which effectively avoids signal interference and improves the stability and reliability of the system, and is suitable for the complex electromagnetic environment of coal mines. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a principle block diagram of the intrinsic safety power supply parameter acquisition module;

[0017] Figure 2 is a specific embodiment circuit principle diagram of the transformer power supply isolation unit;

[0018] Figure 3 is a specific embodiment circuit principle diagram of the voltage acquisition unit;

[0019] Figure 4 is a specific embodiment circuit principle diagram of the intrinsic safety power supply acquisition module;

[0020] Figure 5 is a specific embodiment circuit principle diagram of the optoelectronic isolation unit;

[0021] Figure 6 is a schematic diagram of the connection between the multi-channel intrinsic safety power supply parameter acquisition module and the monitoring substation MCU. DETAILED DESCRIPTION

[0022] The application will be further described below in combination with the drawings and specific embodiments.

[0023] As shown in Figure 1 , the mine monitoring substation intrinsic safety power supply parameter information acquisition device of the application comprises an intrinsic safety power supply acquisition module, a voltage monitoring substation mainboard MCU unit, a voltage acquisition unit, an optoelectronic isolation unit, and a transformer power supply isolation unit. The transformer power supply isolation unit converts a 3.3V power supply into an isolated power supply S3.3V. The transformer power supply isolation unit is connected with the intrinsic safety power supply acquisition module and provides an isolated power supply for the intrinsic safety power supply acquisition module. The voltage acquisition unit acquires the input voltage of the intrinsic safety power supply. The voltage acquisition unit is connected with the intrinsic safety power supply acquisition module, outputs the acquired voltage signal to the intrinsic safety power supply acquisition module, and the intrinsic safety power supply acquisition module performs analog-to-digital conversion on the voltage signal and converts the voltage signal into a current signal. The optoelectronic isolation unit performs optocoupler isolation on the signal. The intrinsic safety power supply acquisition module is connected with the voltage monitoring substation mainboard MCU unit after passing through the optoelectronic isolation unit, and data communication is realized.

[0024] Because the intrinsic safety power supply of the mine monitoring substation is an isolated power supply, the power supplies are not grounded to each other, so the power supply of the intrinsic safety power supply acquisition module is designed in the form of transformer power supply isolation. The specific embodiment is as follows Figure 2As shown, the transformer power isolation unit uses the MX6505 (U4) as the transformer driver and the MXPP6-3K6110 (U5) isolation transformer. This isolation transformer provides electrical isolation between the input and output, preventing high voltage or noise from being transmitted to sensitive circuits through the power lines. The transformer power isolation unit converts the 3.3V power supply into an isolated power supply, S3.3V.

[0025] like Figure 3 As shown, the specific embodiment of the voltage acquisition unit:

[0026] Voltage sampling: A 0.47Ω resistor is connected in series to each intrinsically safe power input on the monitoring substation mainboard. Voltage sampling is performed using the voltage across the resistor. VM1 and VM2 are the voltage values ​​taken at both ends. VM1 is connected to the module MCU's PA1 pin via resistor R3 for analog-to-digital conversion and voltage detection (V1). VM2 is connected to the module MCU's PB0 pin via resistor R5 for analog-to-digital conversion and voltage detection (V2). The module MCU uses the voltage at V1 as the input voltage for the intrinsically safe power supply.

[0027] Current sampling: The voltage signal from a 0.47Ω resistor is sampled, and the voltage difference across the resistor is calculated as V1-V2 = △V. Given the sampling resistor R, the real-time current is calculated using the formula I = △V / R. To ensure the stability of the displayed current value, the calculated current is smoothed and the average value obtained from multiple samplings is used as the output current value.

[0028] like Figure 4 The figure shows the circuit schematic diagram of a specific embodiment of the intrinsically safe power acquisition module. The intrinsically safe power acquisition module uses STM32L031G6U6 (U1) as the module MCU, which is responsible for processing and transmitting the collected signals.

[0029] like Figure 5 This is a schematic circuit diagram of a specific embodiment of the optoelectronic isolation unit, which implements data communication isolation. Because the monitoring substation mainboard MCU and the module acquisition MCU are powered by different power supplies, EL3H7 optocouplers U2 and U3 are used for isolation to achieve data communication. U2 is connected to the module MCU's TX2 pin, and U3 is connected to the module MCU's PA15 pin. After the monitoring substation mainboard MCU controls the signal CTR to a low level through optocoupler U3, PA15 is pulled high, controlling the TX2 pin to send data. After the module MCU pin TX2 is isolated by the U2 optocoupler, it outputs the signal OUT to the monitoring substation mainboard MCU. The mainboard MCU displays and processes the data.

[0030] like Figure 6The shown is a schematic diagram of the connection between the multi-channel intrinsically safe power parameter acquisition module and the monitoring substation MCU, which shows the specific connection mode between the five-channel intrinsically safe power acquisition module, the AC state and the battery state acquisition part (the original function module part) and the monitoring substation mainboard MCU. The TX2 of the five-channel intrinsically safe power acquisition module, the TX of the AC state and the battery state are uniformly connected to the RX of the monitoring substation mainboard. The monitoring substation mainboard realizes data acquisition of the corresponding module by controlling the CRT level of each module.

[0031] The monitoring substation mainboard designs five-channel intrinsically safe power acquisition modules, and retains the original power state and battery state acquisition part. The software part and the hardware part of the intrinsically safe acquisition module are completely the same. The purpose is to upload the voltage and current of the intrinsically safe power output to the center station for display and calculation. The display is to pay attention to the working state of the intrinsically safe power, and the calculation is to calculate the actual output power of the current intrinsically safe power through the data of each intrinsically safe power, so as to calculate the time that the backup battery can continue to supply power, so that the decision maker can know the working state of the backup power of the monitoring substation in real time.

[0032] The intrinsically safe power acquisition module adopts modular design, and the module finished product is welded on the mine monitoring substation mainboard. A total of five acquisition modules are provided for acquiring the voltage and current of five intrinsically safe power. In the welding process, the welding process requirements are strictly followed to prevent pin short circuit.

[0033] Software configuration: according to the hardware design, the corresponding software program is written and burned into the module MCU and the monitoring substation mainboard MCU. In the software running process, the module MCU samples the voltage and current of the intrinsically safe power according to the set sampling frequency, and performs calculation and smoothing processing, and then transmits the processed data to the monitoring substation mainboard MCU through optical coupling isolation. After receiving the data, the monitoring substation mainboard MCU displays and further processes, and uploads the related data to the center station. At the same time, the software program also needs to manage and process the original power state and battery state acquisition function, to ensure the normal operation of the whole system.

[0034] In addition to the above embodiments, the present application can also have other implementation manners, and any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope of the present application.

Claims

1. A mine monitoring substation intrinsically safe power supply parameter information acquisition device, characterized in that: It includes an intrinsically safe power supply acquisition module, a monitoring substation mainboard MCU unit, a voltage acquisition unit, a photoelectric isolation unit, and a transformer power supply isolation unit. The transformer power supply isolation unit converts a 3.3V power supply into an isolated power supply S3.3V. The transformer power supply isolation unit is connected to the intrinsically safe power supply acquisition module to provide an isolated power supply for the intrinsically safe power supply acquisition module. The voltage acquisition unit acquires the input voltage of the intrinsically safe power supply. The voltage acquisition unit is connected to the intrinsically safe power supply acquisition module and outputs the acquired voltage signal to the intrinsically safe power supply acquisition module. The intrinsically safe power supply acquisition module performs analog-to-digital conversion on the voltage signal and converts the voltage signal into a current signal. The photoelectric isolation unit performs optical coupling isolation on the signal. The intrinsically safe power supply acquisition module is connected to the monitoring substation mainboard MCU unit after passing through the photoelectric isolation unit to realize data communication.

2. The intrinsically safe power supply parameter information acquisition device for a mine monitoring substation according to claim 1, characterized in that: The voltage acquisition unit connects a sampling resistor in series to each intrinsically safe power input of the monitoring substation mainboard, takes the voltage at one end of the sampling resistor as the input voltage of the intrinsically safe power supply; calculates the voltage difference V1-V2=△V across the sampling resistor, calculates the real-time current through the formula I=△V / R for current sampling, and R is the sampling resistor value.

3. The intrinsically safe power supply parameter information acquisition device for a mine monitoring substation according to claim 1, characterized in that: The photoelectric isolation unit adopts EL3H7 optocoupler U2 and EL3H7 optocoupler U3 for isolation to realize data communication; U2 is connected to the TX2 pin of the intrinsically safe power acquisition module MCU, and U3 is connected to the PA15 pin of the intrinsically safe power acquisition module MCU. After the monitoring substation mainboard MCU controls the signal CTR to a low level through the optocoupler U3, PA15 pulls the level high to control the TX2 pin to send data. The TX2 pin of the intrinsically safe power acquisition module MCU is isolated by the U2 optocoupler and outputs the signal OUT to the monitoring substation mainboard MCU.

4. The intrinsically safe power supply parameter information acquisition device for a mine monitoring substation according to claim 1, characterized in that: The transformer power isolation unit uses MX6505 as a transformer driver and MXPP6-3K6110 as an isolation transformer. The input power is output to the isolation transformer through the transformer driver, and the isolation transformer outputs isolated power.

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