An explosion-proof touch panel

Abstract

An explosion-proof touch panel provided by the present invention relates to the technical field of touch panels and includes a touch printing layer, an explosion-proof panel, a control circuit board, and a data line. The touch printing layer is disposed on the explosion-proof panel and is used for sensing touch operations and converting them into electrical signals. The touch printing layer interface is connected to the data line, and the data line is connected to the control circuit board. The control circuit board integrates a power supply circuit, a touch signal detection circuit, a data processing circuit, and a USB interface circuit. The explosion-proof touch panel of the present invention can be connected to an external device through the USB interface to add a touch function thereto, significantly improving the operation convenience. Moreover, the power supply voltage of the USB is monitored in real time through the power management unit, and the preset algorithm is used to analyze the voltage change trend. When the voltage is unstable, the parameters of the voltage stabilizing chip can be quickly adjusted to ensure stable power supply to the control circuit board, avoid device failures caused by voltage fluctuations, and ensure the operation stability of the touch panel.

Description

Technical Field

[0001] The present invention relates to the technical field of touch panels, and in particular to an explosion-proof touch panel. Background Art

[0002] In industrial fields such as petroleum, chemical industry, and coal mines where there are flammable and explosive hazards, conventional industrial control computers and computer terminals often only have basic display functions and lack touch operation functions. In order to improve the convenience and efficiency of operation, in many cases, it is necessary to expand the touch function of the equipment.

[0003] However, ordinary touch panels on the current market either do not have explosion-proof performance and cannot be directly applied to some high-risk and extremely cold environments, or need to be controlled by connecting external devices such as mice or keyboards.

[0004] At the same time, even if there are some touch panels with explosion-proof functions, there are also problems such as poor power supply stability. When the voltage fluctuates, it is easy to affect the normal operation of the equipment, and it cannot operate and control the screen sensitively and accurately, and cannot well meet the actual needs of industrial production. Summary of the Invention

[0005] The present invention aims to provide an explosion-proof touch panel to solve the deficiencies of existing touch panels in explosion-proof environment applications, achieve safe, accurate, and efficient touch operations, and ensure stable, safe, and reliable power supply.

[0006] To solve the above technical problems, an explosion-proof touch panel provided by the present invention includes a touch printing layer, an explosion-proof panel, a control circuit board, and a data cable. The touch printing layer is disposed on the explosion-proof panel and is used to sense touch operations and convert them into electrical signals; the touch printing layer interface is connected to the data cable, and the data cable is connected to the control circuit board;

[0007] The control circuit board integrates a power supply circuit, a touch signal detection circuit, a data processing circuit, and a USB interface circuit;

[0008] The power supply circuit is used to convert external electrical energy into a stable voltage for use by the control circuit board;

[0009] The touch signal detection circuit consists of a touch printing layer and capacitance and resistance elements to form a touch sensing unit, and is used to transmit the capacitance change signal generated by touch to the data processing circuit after amplification and analog-to-digital conversion;

[0010] The data processing circuit is used to convert digital signals into touch point coordinate information according to a preset algorithm and is also responsible for data interaction with external devices;

[0011] The USB interface circuit follows the general USB standard and is used to achieve data transmission with external devices.

[0012] Preferably, the coordinate conversion algorithm adopted by the data processing circuit is as follows:

[0013] Identify the touch sensing units on the touch printing layer. Assume there are m sensing units in the horizontal direction and n sensing units in the vertical direction on the touch printing layer. The horizontal spacing between each sensing unit is and the vertical spacing is . After digital signal processing, the horizontal count value and the vertical count value are obtained. The calculation formula for the touch point coordinates is: , , where X is the horizontal coordinate and Y is the vertical coordinate.

[0014] Preferably, the data transmission system between the control circuit board and the external device adopts a data encryption and verification mechanism. The control circuit board encrypts the touch point coordinate data using the AES algorithm and adds a CRC verification code. The external device decrypts and verifies it after receiving. If the verification fails, it requests retransmission.

[0015] Preferably, the control circuit board also includes a power management unit; the power management unit is used to monitor the power status and adjust the parameters of the voltage stabilizing chip in the power circuit when the power status is abnormal;

[0016] The power management unit also has a low-power management function; the low-power management function is used to analyze the operation information of the touch printing layer to determine whether to enter the low-power mode; the low-power mode is used to trigger the operating frequency and power of the control chip to be at the lowest operating level;

[0017] In the low-power mode, if a new touch operation is detected, the system is quickly awakened to restore the touch panel to the normal working state.

[0018] Preferably, the power management unit is used to monitor and judge the power status. The specific steps are as follows:

[0019] The USB power supply voltage is monitored in real time through a built-in voltage monitoring circuit; the voltage monitoring circuit includes a resistor voltage divider and an analog-to-digital converter;

[0020] The USB power supply voltage is divided by a set ratio to obtain a voltage value suitable for the input range of the ADC ; There are two resistors in the resistor voltage divider, denoted as R1 and R2; then the voltage division formula is: ;

[0021] Then, the analog voltage signal is converted into a digital signal D using the analog-to-digital converter. Specifically: Identify that the resolution of the analog-to-digital converter is N bits and the reference voltage is , then the digital signal D and the analog voltage have the following relationship: ; thus, the actual USB supply voltage is calculated;

[0022] Then, analyze the change trend of the actual USB supply voltage to obtain the voltage trend value;

[0023] Then, compare the USB supply voltage and the voltage trend value with their preset threshold values to determine whether the current voltage is stable. If the voltage is unstable, the parameters of the voltage regulator chip need to be adjusted;

[0024] Preferably, comparing the USB supply voltage and the voltage trend value with their preset threshold values to determine whether the current voltage is stable is specifically as follows:

[0025] Set the preset voltage range corresponding to the USB supply voltage and the preset reasonable trend range corresponding to the voltage trend value;

[0026] Compare the USB supply voltage with the preset voltage range as follows:

[0027] If the USB supply voltage is within the preset voltage range , it means that the USB supply voltage is stable and no adjustment is required;

[0028] If the USB supply voltage is not within the preset voltage range , it means that the USB supply voltage is unstable and the parameters of the voltage regulator chip need to be adjusted;

[0029] Compare the voltage trend value with the preset reasonable trend range:

[0030] If the voltage trend value is within the preset reasonable trend range, it means that the USB supply voltage is stable and no adjustment is required;

[0031] If the voltage trend value is not within the preset reasonable trend range, it means that the USB supply voltage is unstable and the parameters of the voltage regulator chip need to be adjusted.

[0032] Preferably, analyzing the change trend of the actual USB supply voltage specifically has the following analysis process:

[0033] Set the voltage monitoring period, divide the voltage monitoring period into several monitoring partitions and number them in chronological order, and obtain the USB supply voltage at any moment in the monitoring partition , calculate the voltage difference by subtracting the minimum USB supply voltage from the maximum USB supply voltage in the monitored partition; identify all the voltage differences within the voltage monitoring period and calculate them using the standard deviation formula to obtain the differential pressure trend value;

[0034] Calculate the partition voltage trend value for the USB supply voltage in the monitored partition using the standard deviation formula; identify the start time of the monitored partition, and calculate the time difference between the start time of the monitored partition and the current time to obtain the zone time difference; perform normalized weighted processing on the partition voltage trend value, the zone time difference, and the differential pressure trend value to obtain the voltage trend value.

[0035] Preferably, if the voltage is unstable, the parameters of the voltage regulator chip need to be adjusted. The specific adjustment steps are as follows:

[0036] Step 1, obtain the current state parameters and voltage trend value of the voltage regulator chip. The current state parameters include the current output voltage and the current feedback resistance ;

[0037] Step 2, set the expected output voltage of the voltage regulator chip. Based on the expected output voltage, the current output voltage and the current feedback resistance perform processing to obtain the target value Rm of the feedback resistance that needs to be adjusted;

[0038] Step 3, use a digital potentiometer as the feedback resistance , according to the resolution of the digital potentiometer , convert the target value of the feedback resistance into the setting value S of the digital potentiometer. The formula is , where represents the minimum resistance adjustment step of the digital potentiometer; send the setting value S to the digital potentiometer through the communication interface to achieve the adjustment of the feedback resistance;

[0039] Step 4, after adjusting the feedback resistance, monitor the output voltage of the voltage regulator chip again, and calculate the difference between the actual output voltage and the expected output voltage and record it as the adjustment difference; if the absolute value of the adjustment difference is greater than its preset error threshold, re - execute Steps 1 to 3; set the number of times of re - execution, and when the preset number of re - execution times is reached, generate an alarm notification and send it to the preset operation and maintenance personnel; the alarm notification includes the voltage trend value, the output voltage value, and the USB supply voltage value.

[0040] Preferably, analyze the operation information of the touch printing layer to determine whether to enter the low - power mode. The specific steps are as follows:

[0041] Monitor the touch operation signal output by the touch signal detection circuit;

[0042] Identify the moment when the touch imprint layer is closest to the current moment when generating a touch operation signal as the initial moment, calculate the time difference between the current moment and the initial moment to obtain the touch time difference; set a touch time threshold. If a touch operation signal is generated again before the touch time difference reaches the touch time threshold, update the moment when the touch operation signal is generated most recently; when the touch time difference is greater than its touch time threshold, determine that the touch panel is in an idle state and trigger the entry into the low-power mode.

[0043] Compared with the related art, an explosion-proof touch panel provided by the present invention has the following beneficial effects:

[0044] 1. The explosion-proof touch panel of the present invention can be connected to an external device through a USB interface to add a touch function thereto, significantly improving the operation convenience; at the same time, the explosion-proof panel is made of a special material, which can effectively reduce the damage caused to the external device by external bumps, effectively ensuring the service life of the external device.

[0045] 2. The present invention monitors the USB power supply voltage in real time through a power management unit, analyzes the voltage change trend by using a preset algorithm, and can quickly adjust the parameters of the voltage regulator chip when the voltage is unstable, ensuring stable power supply to the control circuit board, avoiding equipment failures caused by voltage fluctuations, and ensuring the operation stability of the touch panel; in addition, its low-power management function can automatically enter the low-power mode when the device is idle, reducing the chip operating frequency and power, reducing energy consumption, extending the service life of the device, and improving energy utilization efficiency.

[0046] 3. The explosion-proof touch panel of the present invention does not require other operating objects such as a mouse and a keyboard, and can directly perform touch operations through the touch panel on the box body, which not only improves the operation sensitivity, efficiency and safety, avoids the inconvenience and potential hazards brought by searching for and operating external devices in a complex environment, but also adapts to complex operating environments, is not affected by factors such as narrow spaces, vibrations, and corrosive substances, and simplifies the operation process, providing an efficient and safe operation solution for industrial production.

[0047] In summary, an explosion-proof touch panel proposed by the present invention solves the deficiencies in the application of the touch panel in an explosion-proof environment, realizes safe, accurate and efficient touch operations, and at the same time ensures stable, safe and reliable power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic structural diagram of an explosion-proof touch panel provided by the present invention;

[0049] Figure 2 is a principle block diagram of a control circuit board provided by the present invention.

[0050] Reference numerals in the figure: 1, touch imprint layer; 2, explosion-proof panel; 3, data line; 4, control circuit board. Detailed implementation manners

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0052] The terms used in this disclosure are only for the purpose of describing specific embodiments, and are not intended to limit this disclosure. The singular forms of "group", "class" and "the" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0053] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0054] Please refer to in combination Figure 1 - Figure 2 . An explosion-proof touch panel includes a touch printing layer 1, an explosion-proof panel 2, a control circuit board 4, and a data line 3. The touch printing layer 1 is disposed on the explosion-proof panel 2 and is used to sense touch operations and convert them into electrical signals; the interface of the touch printing layer 1 is connected to the data line 3, and the data line 3 is connected to the control circuit board 4; it should be noted that the explosion-proof panel 2 is made of special tempered explosion-proof glass, which is a prior art and will not be elaborated herein;

[0055] The control circuit board 4 integrates a power supply circuit, a touch signal detection circuit, a data processing circuit, and a USB interface circuit;

[0056] The power supply circuit is used to convert external electrical energy into a stable voltage for use by the control circuit board 4;

[0057] The touch signal detection circuit consists of a touch printing layer 1 and capacitance and resistance elements to form a touch sensing unit, and is used to transmit the capacitance change signal generated by touch to the data processing circuit after amplification and analog-to-digital conversion;

[0058] The data processing circuit is used to convert digital signals into touch point coordinate information according to a preset algorithm, and is also responsible for data interaction with external devices;

[0059] The USB interface circuit complies with the general USB standard and is used to implement data transmission with external devices.

[0060] It should be noted that this product can be applied to industrial fields with explosive and flammable hazards such as petroleum, chemical industry, and coal mines. To meet the explosion-proof requirements, conventional industrial control computers and computer terminals often add explosion-proof screens. However, this makes the device operation relatively cumbersome. During actual use, operators still need to operate with the help of a mouse or keyboard. In some scenarios with complex working conditions and limited space, finding and operating the mouse and keyboard not only wastes time but may also pose safety hazards due to incorrect operations.

[0061] In sharp contrast, for the explosion-proof touch panel provided by the present invention, when a user performs a touch operation on the touch printing layer 1, the touch printing layer 1 can quickly sense the touch action and convert it into an electrical signal; these electrical signals are transmitted to the control circuit board 4 through the data line 3. The control circuit board 4 integrates a power supply circuit, a touch signal detection circuit, a data processing circuit, and a USB interface circuit; the touch signal detection circuit amplifies and performs analog-to-digital conversion on the capacitance change signal generated by the touch and then transmits it to the data processing circuit. The data processing circuit then converts the digital signal into touch point coordinate information according to a preset algorithm and sends the encrypted coordinate data to an external industrial control computer or computer terminal through the USB interface circuit. The entire process does not require a mouse, keyboard, or any other operating object, realizing convenient operation on the industrial control computer or computer terminal directly on the touch panel.

[0062] In this application, the coordinate conversion algorithm adopted by the data processing circuit is as follows:

[0063] Identify the touch sensing units on the touch printing layer 1. Assume that there are m sensing units in the horizontal direction and n sensing units in the vertical direction on the touch printing layer 1. The horizontal distance between each sensing unit is and the vertical distance is After digital signal processing, the horizontal count value and the vertical count value are obtained. The touch point coordinate calculation formula is: where X is the horizontal coordinate and Y is the vertical coordinate.

[0064] In this application, the data transmission system between the control circuit board 4 and external devices adopts a data encryption and verification mechanism. The control circuit board 4 encrypts the touch point coordinate data with the AES algorithm and adds a CRC verification code. The external device decrypts and verifies it after receiving. If the verification fails, it requests retransmission.

[0065] In this application, the control circuit board 4 also includes a power management unit; the power management unit is used to monitor the power status and adjust the parameters of the voltage stabilizing chip in the power supply circuit when the power status is abnormal.​

[0066] The power management unit also has a low-power management function; the low-power management function is used to analyze the operation information of the touch printing layer 1 to determine whether to enter the low-power mode; the low-power mode is used to trigger the operating frequency and power of the control chip to be at the lowest operating level;

[0067] In the low-power mode, if a new touch operation is detected, the system is quickly awakened to restore the touch panel to its normal working state.

[0068] In this application, the power management unit is used to monitor and judge the power supply state. The specific steps are as follows:

[0069] The USB power supply voltage is monitored in real time through a built-in voltage monitoring circuit; the voltage monitoring circuit includes a resistor voltage divider and an analog-to-digital converter;

[0070] The USB power supply voltage is divided by a set ratio to obtain a voltage value suitable for the ADC input range ; there are two resistors in the resistor voltage divider, denoted as R1 and R2; then the voltage division formula is: ;

[0071] Then, the analog voltage signal is converted into a digital signal D by using the analog-to-digital converter. Specifically: identify that the resolution of the analog-to-digital converter is N bits and the reference voltage is , then the relationship between the digital signal D and the analog voltage is: ; thus, the actual USB power supply voltage is calculated ;

[0072] Then, analyze the change trend of the actual USB power supply voltage to obtain a voltage trend value;

[0073] Then, compare the USB power supply voltage, the voltage trend value with their preset thresholds to judge whether the current voltage is stable. If the voltage is unstable, the parameters of the voltage regulator chip need to be adjusted;

[0074] In this application, comparing the USB power supply voltage, the voltage trend value with their preset thresholds to judge whether the current voltage is stable is specifically:

[0075] Set a preset voltage range corresponding to the USB power supply voltage and a preset reasonable trend range corresponding to the voltage trend value;

[0076] Compare the USB power supply voltage with the preset voltage range :

[0077] If the USB power supply voltage within a preset voltage range it indicates that the USB power supply voltage is stable and does not need to be adjusted;

[0078] If the USB power supply voltage is not within the preset voltage range it indicates that the USB power supply voltage is unstable and the parameters of the voltage regulator chip need to be adjusted;

[0079] Compare the voltage trend value with the preset reasonable trend range:

[0080] If the voltage trend value is within the preset reasonable trend range, it indicates that the USB power supply voltage is stable and does not need to be adjusted;

[0081] If the voltage trend value is not within the preset reasonable trend range, it indicates that the USB power supply voltage is unstable and the parameters of the voltage regulator chip need to be adjusted.

[0082] In this application, analyze the change trend of the actual USB power supply voltage The specific analysis process is as follows:

[0083] Set the voltage monitoring period, divide the voltage monitoring period into several monitoring partitions according to the time sequence and number them as i, and obtain the USB power supply voltage at any moment in the monitoring partition Calculate the difference between the maximum and minimum USB power supply voltages in the monitoring partition to obtain the partial voltage difference; identify all the partial voltage differences within the voltage monitoring period and calculate them using the standard deviation formula to obtain the partial pressure difference trend value AD1;

[0084] Calculate the partition voltage trend value AD2 for the USB power supply voltage in the monitoring partition using the standard deviation formula;

[0085] Identify the start time of the monitoring partition, and calculate the time difference between the start time of the monitoring partition and the current time to obtain the zone time difference AD3;

[0086] Perform normalization and weighted processing on the partition voltage trend value, the zone time difference, and the partial pressure difference trend value to obtain the voltage trend value AD. The calculation logic is: ; where i represents the number of the monitoring partition, iAD2 and iAD3 respectively represent the partition voltage trend value and the zone time difference corresponding to the monitoring partition i, ia2 and ia3 respectively represent the weights corresponding to the partition voltage trend value and the zone time difference of the monitoring partition i, and a1 represents the weight corresponding to the partial pressure difference trend value.

[0087] In this application, if the voltage is unstable, the parameters of the voltage regulator chip need to be adjusted. The specific adjustment steps are as follows:

[0088] Step 1: Obtain the current state parameters and voltage trend value of the voltage regulator chip. The current state parameters include the current output voltage and the current feedback resistor ;

[0089] Step 2: Set the expected output voltage of the voltage regulator chip. Based on the expected output voltage, the current output voltage and the current feedback resistor perform processing. Take the difference between the current output voltage and the expected output voltage as the expected voltage difference. Perform normalized weighted calculation on the expected voltage difference and the voltage trend value to obtain the resistance adjustment coefficient, and use the resistance adjustment coefficient to adjust the current feedback resistor to obtain the target value Rm of the feedback resistor to be adjusted;

[0090] Step 3: Use a digital potentiometer as the feedback resistor , and according to the resolution of the digital potentiometer , convert the target value of the feedback resistor into the setting value S of the digital potentiometer. The formula is , where represents the minimum resistance adjustment step of the digital potentiometer; send the setting value S to the digital potentiometer through the communication interface to achieve the adjustment of the feedback resistor;

[0091] Step 4: After adjusting the feedback resistor, monitor the output voltage of the voltage regulator chip again, and calculate the difference between the actual output voltage and the expected output voltage and record it as the adjustment difference; if the absolute value of the adjustment difference is greater than its preset error threshold, re - execute Steps 1 to 3; set the number of re - executions, and when the preset number of re - executions is reached, generate an alarm notification and send it to the preset operation and maintenance personnel; the alarm notification includes the voltage trend value, the output voltage value, and the USB power supply voltage value.

[0092] In this application, analyze the operation information of the touch printing layer 1 to determine whether to enter the low - power mode. The specific steps are as follows:

[0093] Monitor the touch operation signal output by the touch signal detection circuit;

[0094] Identify the moment when the touch printing layer 1 generated the touch operation signal closest to the current moment as the initial moment, calculate the time difference between the current moment and the initial moment to obtain the touch time difference; set a touch time threshold. If a touch operation signal is generated again before the touch time difference reaches the touch time threshold, update the moment when the touch operation signal was generated most recently; when the touch time difference is greater than its touch time threshold, determine that the touch panel is in a non - operating state and trigger the entry into the low - power mode.

[0095] The working principle of the present invention is as follows:

[0096] During use, connect the explosion-proof touch panel to an external device, such as an industrial computer, a computer terminal, etc., through the USB interface of the data cable 3; after the device is powered on, the touch panel automatically completes initialization, including the startup of the power circuit, the calibration of the touch signal detection circuit, and the initialization configuration of the data processing circuit and each system; the user performs a touch operation on the touch printing layer 1, and the touch signal passes through the touch signal detection circuit and the data processing circuit in sequence, and sends the encrypted touch point coordinate data to the external device; the external device decrypts and verifies the received data and executes the corresponding operation instructions according to the touch operation type; during use, the power management unit monitors the power status in real time, automatically adjusts the working mode, and ensures the stable operation of the touch panel; when the touch panel has no operation for a long time, it automatically enters the low-power mode; when a new touch operation is detected, the system is quickly awakened and returns to the normal working state.

[0097] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed in this disclosure. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0098] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. An explosion-proof touch panel, comprising a touch printing layer (1), an explosion-proof panel (2), a control circuit board (4), and a data line (3), characterized in that, The touch imprint layer (1) is disposed on the explosion-proof panel (2) for sensing touch operations and converting them into electrical signals; the interface of the touch imprint layer (1) is connected to the data line (3), and the data line (3) is connected to the control circuit board (4); The control circuit board (4) integrates a power supply circuit, a touch signal detection circuit, a data processing circuit, and a USB interface circuit; The power supply circuit is used to convert external electrical energy into a stable voltage for use by the control circuit board (4); The touch signal detection circuit consists of the touch imprint layer (1) and capacitance and resistance elements to form a touch sensing unit, and the capacitance change signal generated by touch is amplified and converted by analog-to-digital conversion and then transmitted to the data processing circuit; The data processing circuit is used to convert digital signals into touch point coordinate information according to a preset algorithm and is also responsible for data interaction with external devices; The USB interface circuit follows the general USB standard and is used to achieve data transmission with external devices; A power management unit is further included on the control circuit board (4); The power management unit is used to monitor the power status and adjust the parameters of the voltage regulator chip in the power supply circuit when the power status is abnormal; The specific steps for the power management unit to monitor the power status and make a judgment are as follows: The USB power supply voltage is monitored in real time through a built-in voltage monitoring circuit to calculate the actual USB power supply voltage; the change trend of the actual USB power supply voltage is analyzed, and the specific analysis process is as follows: A voltage monitoring period is set, the voltage monitoring period is divided into several monitoring partitions in chronological order, the USB power supply voltage at any moment in the monitoring partition is obtained, and the difference between the maximum and minimum USB power supply voltages in the monitoring partition is calculated to obtain a partial voltage difference value; All the partial voltage difference values within the voltage monitoring period are identified and calculated using the standard deviation formula to obtain a partial pressure difference trend value; The USB power supply voltage in the monitoring partition is calculated using the standard deviation formula to obtain a partition voltage trend value; The starting moment of the monitoring partition is identified, and the time difference between the starting moment of the monitoring partition and the current moment is calculated to obtain a zone time difference value; The partition voltage trend value, the zone time difference value, and the partial pressure difference trend value are subjected to normalized weighted processing to obtain a voltage trend value; the USB power supply voltage, the voltage trend value, and their preset thresholds are compared to determine whether the current voltage is stable. If the voltage is unstable, the parameters of the voltage regulator chip need to be adjusted.

2. The explosion-proof touch panel according to claim 1, characterized in that, The coordinate conversion algorithm adopted by the data processing circuit is as follows: Identify the touch sensing units on the touch printing layer (1). Assume that there are m sensing units in the horizontal direction and n sensing units in the vertical direction on the touch printing layer (1). The horizontal spacing between each sensing unit is and the vertical spacing is . After digital signal processing, the horizontal count value and the vertical count value are obtained. The calculation formula for the touch point coordinates is: , , where X is the horizontal coordinate and Y is the vertical coordinate.

3. An explosion-proof touch panel according to claim 1, characterized in that, The data transmission system between the control circuit board (4) and external devices adopts a data encryption and verification mechanism. The control circuit board (4) encrypts the touch point coordinate data using the AES algorithm and adds a CRC verification code. After receiving, the external device decrypts and verifies. If the verification fails, it requests retransmission.

4. An explosion-proof touch panel according to claim 1, characterized in that, The power management unit also has a low-power management function; The low-power management function is used to analyze the operation information of the touch imprint layer (1) to determine whether to enter the low-power mode; the low-power mode is used to trigger the operating frequency and power of the control chip to be at the lowest operating level; In the low-power mode, if a new touch operation is detected, the system is quickly awakened to restore the touch panel to the normal working state.

5. An explosion-proof touch panel according to claim 1, characterized in that, Compare the USB power supply voltage, the voltage trend value with their preset thresholds to determine whether the current voltage is stable. Specifically: Set the preset voltage range corresponding to the USB power supply voltage and the preset reasonable trend range corresponding to the voltage trend value; Compare the USB supply voltage with a preset voltage range as follows: If the USB power supply voltage is within a preset voltage range , it indicates that the USB power supply voltage is stable and does not need to be adjusted; If the USB power supply voltage is not within the preset voltage range , it means that the USB power supply voltage is unstable and the parameters of the voltage regulator chip need to be adjusted; Compare the voltage trend value with the preset reasonable trend range: If the voltage trend value is within the preset reasonable trend range, it indicates that the USB power supply voltage is stable and no adjustment is required; If the voltage trend value is not within the preset reasonable trend range, it indicates that the USB power supply voltage is unstable and the parameters of the voltage regulator chip need to be adjusted.

6. The explosion-proof touch panel according to claim 5, wherein, If the voltage is unstable, the parameters of the voltage regulator chip need to be adjusted. The specific adjustment steps are as follows: Step 1: Obtain the current state parameters and voltage trend value of the voltage regulator chip. The current state parameters include the current output voltage and the current feedback resistor ; Step 2: Set the expected output voltage of the voltage regulator chip. Based on the expected output voltage, the current output voltage and the current feedback resistor perform processing to obtain the target value Rm of the feedback resistor that needs to be adjusted to; Step 3: Use a digital potentiometer as the feedback resistor , according to the resolution of the digital potentiometer , convert the target value of the feedback resistor into the setting value S of the digital potentiometer. The formula is , where represents the minimum resistance adjustment step of the digital potentiometer; send the setting value S to the digital potentiometer through the communication interface to realize the adjustment of the feedback resistor; Step 4, after adjusting the feedback resistor, monitor the output voltage of the voltage regulator chip again, and calculate the difference between the actual output voltage and the expected output voltage, which is recorded as the adjustment difference; if the absolute value of the adjustment difference is greater than its preset error threshold, re-execute Steps 1 to 3; Set the number of re-executions. When the preset number of re-executions is reached, generate an alarm notification and send it to the preset operation and maintenance personnel; the alarm notification includes the voltage trend value, the output voltage value, and the USB power supply voltage value.

7. An explosion-proof touch panel according to claim 4, characterized in that, Analyze the operation information of the touch imprint layer (1) to determine whether to enter the low-power mode. The specific steps are as follows: Monitor the touch operation signal output by the touch signal detection circuit; Identify the moment closest to the current moment when the touch imprint layer (1) generates a touch operation signal as the initial moment, and calculate the time difference between the current moment and the initial moment to obtain the touch time difference; Set a touch time threshold. If a touch operation signal is generated again before the touch time difference reaches the touch time threshold, update the moment closest to the current moment when the touch operation signal is generated; when the touch time difference is greater than its touch time threshold, determine that the touch panel is in a no-operation state and trigger the entry into the low-power mode.

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