Mine personnel positioning card reader and control method

Abstract

The invention discloses a mine personnel positioning card reader and a control method. The mine personnel positioning card reader comprises a single chip computer unit, a wireless radio frequency transmission chip, a wireless radio frequency receiving chip, a display module, an alarm module, an RS485 communication module and a power module. The power module provides working power for the single chip computer unit, the wireless radio frequency transmission chip, the wireless radio frequency receiving chip, the display module, the alarm module and the RS485 communication module. The wireless radio frequency transmission chip, the wireless radio frequency receiving chip, the display module, the alarm module and the RS485 communication module are respectively connected to the single chip computer unit. The invention receives and identifies and locates radio frequency signals emitted by wireless positioning identification cards worn by underground personnel, dynamically acquires the real-time positions of the underground personnel, and the hardware circuit of the personnel positioning card reader suppresses the large current impact generated when connecting to an external power supply and the high-frequency electromagnetic interference contained in an external 18V power supply circuit.

Description

Technical Field

[0001] The invention relates to a mine personnel positioning card reader and a control method thereof, belonging to the technical field of wireless communication. Background Art

[0002] Mine personnel positioning is an important part of the real-time management system of mine personnel. In recent years, mine personnel positioning has been widely used. Personnel positioning can observe the relative position of mine workers in the mine in real time through ground software, and can provide managers with a clear positioning interface for on-site work management. Ground dispatch can promptly notify personnel at relevant locations to pay attention to work safety based on the sensor data of each location given by the environmental safety monitoring system, which plays a very important role in mine safety production. The previous personnel positioning methods mainly include contactless RFID cards, camera face image capture and recognition, iris attendance, face attendance, etc. These methods require personnel to actively cooperate to complete, which is inconvenient to use and will also cause incomplete detection data. Recently, wireless radio frequency chips are used to make personnel positioning identification cards, and the positioning identification card reader base station receives the wireless signal emitted by the positioning identification card. The technology of personnel positioning identification has gradually developed and applied, so that underground workers can be positioned without active cooperation. However, the prior art has the following technical problems: 1. When a huge number of positioning identification cards simultaneously send out wireless radio frequency signals near a positioning identification card reader base station, it is easy to cause congestion in the wireless communication channel and collision of multiple wireless communication signals, thereby causing the positioning identification signal data to be lost or confused, or even the positioning identification system to be paralyzed, endangering underground safety; 2. The power supply circuit part of the mine personnel positioning card reader is prone to large current shock and failure when connected to an external power supply, and the external 18V power supply circuit contains high-frequency electromagnetic interference, which affects the stability of the positioning card reader system. Summary of the invention

[0003] The purpose of the present invention is to provide a mine personnel positioning card reader and control method, which can receive and identify the radio frequency signals emitted by the wireless positioning identification cards worn by underground personnel, dynamically obtain the real-time position of the underground personnel, and the hardware circuit of the personnel positioning card reader can suppress the large current impact generated when connecting to the external power supply and the high-frequency electromagnetic interference contained in the external 18V power supply circuit.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A mine personnel positioning card reader, comprising a single-chip unit 1, a wireless radio frequency transmission chip 201, a wireless radio frequency receiving chip 202, a display module 3, an alarm module 4, an RS485 communication module 5, and a power module 6. The power module 6 provides working power for the single-chip unit 1, the wireless radio frequency transmission chip 201, the wireless radio frequency receiving chip 202, the display module 3, the alarm module 4, and the RS485 communication module 5; the wireless radio frequency transmission chip 201, the wireless radio frequency receiving chip 202, the display module 3, the alarm module 4, and the RS485 communication module 5 are respectively connected to the single-chip unit 1; the single-chip unit 1 provides a unified precision clock to control the wireless radio frequency transmission chip The chip 201 and the wireless RF receiving chip 202 send and receive signal data with the external personnel positioning identification card. The wireless RF transmitting chip 201 sends beacon information to the external personnel positioning identification card in a 2-second period. The main control microcontroller sets the wireless RF receiving chip 202 in the receiving working mode to receive the report data from the personnel positioning identification card in real time to complete the wireless reception of the ID data of the personnel positioning; the RS485 communication module 5 communicates with the ground host and transmits the card reading information to the ground host. The model of the main control 32-bit microcontroller is STM32F103RET6, and the model of the wireless RF transmitting chip and the wireless RF transmitting chip are TICC2500.

[0006] A method for controlling a mine personnel positioning card reader, the method comprising the following steps:

[0007] (1) Through the radio frequency transmission module, the beacon information of the positioning card reader is sent at a 2 millisecond interval to provide the identification card with an accurate time slot control beacon to prevent wireless collision conflicts when a card reader communicates with multiple identification cards at the same time;

[0008] (2) If there is an identification card within the effective distance of the card reader, the identification card will answer the identification card ID according to the result of the collision avoidance calculation, and the RF receiving module will collect the ID data answered by the identification card;

[0009] (3) The ground host sends a call to the local positioning card reader through the interface, requesting the return of the data of the read identification card. The local positioning card reader packages the read data and sends it to the host through the RS485 module;

[0010] (4) The ground host sends a search command through the interface. After parsing, this positioning card reader adds the information of the called identification card to the beacon through the radio frequency transmission module. When the corresponding identification card is nearby and responds to this positioning card reader, this positioning card reader displays the identification card information on the display module and sends an alarm sound through the alarm module.

[0011] The purpose of the present invention can also be further achieved by the following technical measures:

[0012] The above-mentioned mine personnel positioning card reader, wherein the power module includes a diode D21, a capacitor C21, a resistor R21, a resistor R23, an N-MOS tube Q21, a common mode inductor H21, a transient suppression diode D1, a diode D2, and a capacitor C1. The model of the N-MOS tube Q21 is SI2318, the model of the common mode inductor H21 is W501, the model of the transient suppression diode D1 is 5KP20A, and the models of the diode D21 and the diode D2 are Schottky diodes SS14; the cathode of the diode D21 is connected to an 18V external intrinsically safe power supply, the anode of the diode D21 is grounded after passing through the capacitor C21, and the two ends of the resistor R21 are connected to the diode D 21 in parallel, the G pole of the N-MOS tube Q21 is connected to the anode of the diode D21, the S pole of the N-MOS tube Q21 is grounded, the D pole of the N-MOS tube Q21 is grounded, the two ends of the resistor R23 are connected between the S pole and the D pole of the N-MOS tube Q21, the 3rd pin of the common-mode inductor H21 is connected to the 18V external intrinsically safe power supply, the 4th pin of the common-mode inductor H21 is grounded, the 1st pin of the common-mode inductor H21 is grounded, the 2nd pin of the common-mode inductor H21 is connected to the anode of the diode D2, the anode of the instantaneous suppression diode D1 is grounded, the cathode of the instantaneous suppression diode D1 is connected to the 2nd pin of the common-mode inductor H21, one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected to the cathode of the diode D2.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] It solves the problem of spatial data collision when multiple personnel positioning wireless identification cards are read simultaneously, and can read up to 1,000 cards within 2 seconds. A slow start circuit is set in the power supply part to suppress the large current impact generated when connecting to the external power supply and the high-frequency electromagnetic interference contained in the external 18V power supply circuit, ensuring the stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the positioning card reader system of the present invention;

[0016] Figure 2 The circuit diagram of the main control single chip unit of the present invention;

[0017] Figure 3 Circuit diagram of the wireless radio frequency transmitting chip and the wireless radio frequency receiving chip of the present invention;

[0018] Figure 4 The circuit diagram of the external communication part of the present invention;

[0019] Figure 5 Circuit diagram of the alarm output part of the present invention;

[0020] Figure 6 Circuit diagram of the power supply part of the present invention;

[0021] Figure 7This is the circuit diagram of the 5V switching power supply module;

[0022] Figure 8 This is the circuit diagram of the 3.3V voltage regulator chip;

[0023] Fig. 9 The figure is a flow chart of the positioning card reader control method. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, the mine personnel positioning card reader of the present invention includes a single-chip unit 1, a wireless radio frequency transmission chip 201, a wireless radio frequency receiving chip 202, a display module 3, an alarm module 4, an RS485 communication module 5, and a power module 6. The power module 6 provides working power for the single-chip unit 1, the wireless radio frequency transmission chip 201, the wireless radio frequency receiving chip 202, the display module 3, the alarm module 4, and the RS485 communication module 5; the wireless radio frequency transmission chip 201, the wireless radio frequency receiving chip 202, the display module 3, the alarm module 4, and the RS485 communication module 5 are respectively connected to the single-chip unit 1. The single-chip unit 1 provides a unified precision clock to control the wireless radio frequency transmission chip 201 and the wireless radio frequency receiving chip 202 to read the personnel positioning identification card signal. The wireless radio frequency transmission chip 201 sends beacon information in a 2-second period. The main control single-chip sets the wireless radio frequency receiving chip 202 in the receiving working mode to receive the report data from the positioning identification card in real time, and completes the ID wireless receiving work of the personnel positioning. The RS485 communication module 5 communicates with the ground host and transmits the card reading information to the ground host. The model of the main control 32-bit microcontroller is STM32F103RET6, and the models of the wireless radio frequency transmission chip 201 and the wireless radio frequency transmission chip 202 are TICC2500.

[0026] The above hardware is arranged on a PCB board. The main control 32-bit single-chip microcomputer provides a unified precision clock. By controlling the wireless RF transmitting chip and the wireless RF receiving chip, the signal of the personnel positioning identification card is accurately read to prevent wireless collision. The external RS485 communication module is remotely connected to the communication interface to transmit the card reading information to the ground host. This circuit provides a data resolution cycle with an accuracy of 2ms, which can prevent wireless tag data collision as much as possible and improve the tag recognition rate of mine personnel positioning.

[0027] like Figure 2The circuit diagram of the specific embodiment of the single-chip unit is shown. The single-chip unit 1 is composed of a 32-bit single-chip STM32F103RET6 as the core. The Y101 8MHz crystal provides the single-chip precise operating clock to ensure that the system can accurately distinguish the 2ms working time slot. The Y103 32.768kHz crystal provides the single-chip time clock. U102 FM24CL256 provides data storage function, caches the identification card data read by the card reader, communicates with the main control single-chip through I2C_SCL, I2C_SDA, and I2C_WP, and is controlled by the main control single-chip to complete data access. U103 DS1302 real-time clock chip is used as a backup real-time clock for the system and to verify the real-time clock of the main control microcontroller. The chip completes data communication with the main control microcontroller through SCLK and SDATA; the COM5_TX and COM5_RX serial ports of the main control microcontroller communicate with the wireless RF transmitting chip 201 of the wireless module; the COM2_TX and COM2_RX serial ports communicate with the wireless RF receiving chip 202 of the wireless module; the COM1_TX and COM1_RX1 serial ports communicate with the external communication module U5; the FMQKZ and BJDKZ signal pins communicate with the alarm output module, and the COM4_TX and COM4_RX serial ports communicate with the display module.

[0028] like Figure 3 The circuit diagram of the specific embodiment of the wireless module is shown, which includes a wireless RF transmitting chip 201 and a wireless RF receiving chip 202. The wireless RF transmitting chip 201 completes data communication with the main control microcontroller through the COM5_TX, COM5_RX serial ports, and the main control microcontroller controls the wireless RF transmitting chip 201 to send beacon information in a 2-second cycle. The wireless RF receiving chip 202 completes data communication with the main control microcontroller through the COM2_TX, COM2_RX serial ports. The main control microcontroller sets the wireless receiving module in the receiving working mode, receives the report data from the positioning identification card in real time, and completes the ID wireless receiving work of the personnel positioning.

[0029] like Figure 4 The circuit diagram of the RS485 communication module is shown as a specific embodiment. The RS485 communication module 5 is composed of U5 communication control chip STC8F2K16S2, U51 signal magnetic isolation chip HM2401B, U52 RS485 communication chip and auxiliary components to complete the communication between the positioning card reader and the host computer. U5 communicates with the main control microcontroller through the COM1_RX1 and COM1_TX signal pins to exchange external communication data.

[0030] like Figure 5The circuit diagram of the specific embodiment of the alarm output part is shown, which includes U6 amplifier comparator LM358DR2G, Q61NPN transistor 9014, Q201 PNP transistor 9015 and auxiliary components. When the card reader is about to alarm, the main control microcontroller FMQKZ outputs a high level, drives Q61 to conduct, U6 works to form a frequency oscillator, and drives the J6 buzzer to sound an alarm; at the same time, the main control microcontroller BJDKZ signal inputs high and low levels according to a 1-second cycle, drives Q201 to conduct and cut off, and controls the J7 alarm LED light to flash. Achieve the alarm prompt effect.

[0031] like Figure 6 The circuit diagram of a specific embodiment of the power module is shown, and the power module includes a diode D21, a capacitor C21, a resistor R21, a resistor R23, an N-MOS tube Q21, a common mode inductor H21, a transient suppression diode D1, a diode D2, and a capacitor C1. The model of the N-MOS tube Q21 is SI2318, the model of the common mode inductor H21 is W501, the model of the transient suppression diode D1 is 5KP20A, and the models of the diode D21 and the diode D2 are Schottky diodes SS14; the cathode of the diode D21 is connected to an 18V external intrinsically safe power supply, the anode of the diode D21 is grounded after passing through the capacitor C21, and both ends of the resistor R21 are connected to the diode D21 is connected in parallel, the G pole of the N-MOS tube Q21 is connected to the anode of the diode D21, the S pole of the N-MOS tube Q21 is grounded, the D pole of the N-MOS tube Q21 is grounded, the two ends of the resistor R23 are connected between the S pole and the D pole of the N-MOS tube Q21, the 3rd pin of the common-mode inductor H21 is connected to the 18V external intrinsically safe power supply, the 4th pin of the common-mode inductor H21 is grounded, the 1st pin of the common-mode inductor H21 is grounded, the 2nd pin of the common-mode inductor H21 is connected to the anode of the diode D2, the anode of the instantaneous suppression diode D1 is grounded, the cathode of the instantaneous suppression diode D1 is connected to the 2nd pin of the common-mode inductor H21, one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected to the cathode of the diode D2.

[0032] In the above circuit, diode D21, resistor R21, capacitor C21, N-MOS tube Q21, and resistor R23 form a slow start circuit, so that the device will not generate a large current shock when connected to the power supply. At the beginning of power-on, Q21 is in the off state, and the resistor R23 in series in the power supply circuit is a 100-ohm resistor, thereby limiting the overall current of the internal circuit and preventing the formation of an instantaneous large current; at the same time, the 18V power supply current passes through R21 to charge C21. After a charging time of about 50 milliseconds, the positive terminal voltage of C21 reaches the turn-on voltage of the Q21 N-MOS tube, and Q21 is turned on and is in a low-resistance state, and the circuit smoothly enters a normal working state; the above circuit prevents the intrinsically safe power supply from malfunctioning due to the impact current, thereby improving the stability of the system. H21 is a common-mode inductor, and its function is to prevent high-frequency electromagnetic interference in the external 18V power supply circuit. The instantaneous suppression diode D1 is a lightning arrester, and D2 is a Schottky diode, and its function is to prevent the internal components of the circuit from burning due to incorrect external 18V input polarity. Figure 7 , 8 As shown, the 18V safety power output by the anode of the diode D2 can be stepped down to DC5V and DC3.3V by the universal chips VR1, VR2 (VR1 is a 5V switching power module, VR2 is an AM1117-3.3V voltage regulator chip) and the auxiliary circuits for use.

[0033] like Fig. 9 As shown in the figure, the specific implementation steps for positioning the card reader control for mine personnel are:

[0034] 1. The card reader is powered on and initialized to set the parameters of each module. The working cycle of the wireless RF transmitting chip 201 and the wireless RF receiving chip 202 is set to 2ms. The wireless RF transmitting chip 201 is controlled to send the positioning time stamp data regularly. The time stamp data contains the answer sequence information of the identification card. The beacon data format is: FF 7E XX X1 X2 CRCLCRCH, where the two bytes X1 X2 are the time information of the beacon, the two bytes of integer data are low-order in front and high-order in the back, and the data ranges from 0-1000. FF 7E is the data packet frame header, XX is the address of the card reader, CRCL, CRCH is the CRC-16 checksum, the low byte is in front and the high byte is in the back. The data packet can be used to inform the identification card of the current time slot data, which is used to control the answer of the identification card.

[0035] 2. When the identification card passes near the card reader, it detects the beacon data of the card reader and sets its own response time according to the time slot information in the beacon. When the wireless RF receiving chip 202 receives the identification card data, it sends it to the main control microcontroller through an interrupt. The data format is F4 H1 H2 H3 CRCL CRCH, where H1 and H2 are the identification card number information, the two-byte integer data has the low bit in front and the high bit in the back, and the data ranges from 0 to 10000. The battery power: the highest bit of the H2 byte, the emergency rescue mark H2 byte is the lowest bit, and H3 is the signal field strength data of the identification card, the data ranges from 0 to 255, the larger the value, the higher the field strength. CRCL, CRCH are CRC-16 checksums, with the low byte in front and the high byte in the back.

[0036] 3. The main control microcontroller communicates with the ground computer through the RS485 communication module, and uses general technology to return the received identification card data and execute control instructions as required.

[0037] The present invention solves the spatial data collision problem when multiple personnel positioning wireless identification cards are read simultaneously through the configuration of the above hardware and control method, and can read up to 1,000 cards within 2 seconds, achieving practical value.

[0038] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A mine personnel positioning card reader, comprising a single-chip unit, a wireless radio frequency transmission chip, a wireless radio frequency receiving chip, a display module, an alarm module, an RS485 communication module, and a power module, wherein the power module provides working power for the single-chip unit, the wireless radio frequency transmission chip, the wireless radio frequency receiving chip, the display module, the alarm module, and the RS485 communication module; the wireless radio frequency transmission chip, the wireless radio frequency receiving chip, the display module, the alarm module, and the RS485 communication module are respectively connected to the single-chip unit; the single-chip unit provides a unified precision clock to control the wireless radio frequency transmission chip, the wireless radio frequency receiving chip, and the external The personnel positioning identification card of the department sends and receives signal data. The wireless radio frequency transmission chip sends beacon information to the external personnel positioning identification card in a 2-second period. The main control microcontroller sets the wireless radio frequency receiving chip in the receiving working mode to receive the report data from the personnel positioning identification card in real time to complete the wireless reception of the ID data of the personnel positioning; the RS485 communication module communicates with the ground host to transmit the card reading information to the ground host. The model of the main control 32-bit microcontroller of the microcontroller unit is STM32F103RET6, and the model of the wireless radio frequency transmission chip and the wireless radio frequency transmission chip are TICC2500; It is characterized in that The power module includes a diode D21, a capacitor C21, a resistor R21, a resistor R23, an N-MOS tube Q21, a common mode inductor H21, a transient suppression diode D1, a diode D2, and a capacitor C1. The model of the N-MOS tube Q21 is SI2318, the model of the common mode inductor H21 is W501, the model of the transient suppression diode D1 is 5KP20A, and the models of the diode D21 and the diode D2 are Schottky diodes SS14. The cathode of the diode D21 is connected to an 18V external intrinsically safe power supply, the anode of the diode D21 is grounded after passing through the capacitor C21, the two ends of the resistor R21 are connected in parallel with the diode D21, and the N The G pole of the -MOS tube Q21 is connected to the anode of the diode D21, the S pole of the N-MOS tube Q21 is grounded, the D pole of the N-MOS tube Q21 is grounded, the two ends of the resistor R23 are connected between the S pole and the D pole of the N-MOS tube Q21, the 3rd pin of the common mode inductor H21 is connected to the 18V external intrinsically safe power supply, the 4th pin of the common mode inductor H21 is grounded, the 1st pin of the common mode inductor H21 is grounded, the 2nd pin of the common mode inductor H21 is connected to the anode of the diode D2, the anode of the instantaneous suppression diode D1 is grounded, the cathode of the instantaneous suppression diode D1 is connected to the 2nd pin of the common mode inductor H21, one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected to the cathode of the diode D2.

2. The control method of the mine personnel positioning card reader according to claim 1, characterized in that: It includes the following steps: (1) Through the radio frequency transmission module, the beacon information of the positioning card reader is sent at a 2 millisecond interval to provide the identification card with an accurate time slot control beacon to prevent wireless collision conflicts when a card reader communicates with multiple identification cards at the same time; (2) If there is an identification card within the effective distance of the card reader, the identification card will answer the identification card ID according to the result of the collision avoidance calculation, and the RF receiving module will collect the ID data answered by the identification card; (3) The ground host sends a call to the local positioning card reader through the interface, requesting the return of the data of the read identification card. The local positioning card reader packages the read data and sends it to the host through the RS485 module; (4) The ground host sends a search command through the interface. After parsing, this positioning card reader adds the information of the called identification card to the beacon through the radio frequency transmission module. When the corresponding identification card is nearby and responds to this positioning card reader, this positioning card reader displays the identification card information on the display module and sends an alarm sound through the alarm module.

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