Circuit module for explosion-proof touch screen

Abstract

The utility model discloses a circuit module for an explosion-proof touch screen, which comprises a microcontroller and a signal acquisition module, the signal acquisition module is connected with the touch screen, the microcontroller provides driving voltage for the signal acquisition module, a transmitting end and a receiving end of the microcontroller are connected with the signal acquisition module, the microcontroller comprises a high-voltage charge pump and a plurality of capacitors, and the high-voltage charge pump is connected with the signal acquisition module. The driving voltage supplied to the signal acquisition module is boosted through charging and discharging of the capacitor, the sending end of the microcontroller sends an alternating current driving signal to the touch screen through the signal acquisition module, and the receiving end of the microcontroller receives a signal returned by the touch screen through the signal acquisition module; according to the utility model, the high-voltage charge pump in the microcontroller is matched with the capacitor for charging and discharging, so that the driving voltage supplied to the signal acquisition module is increased, and the capacitance touch threshold value is improved, so that when a user finger is separated from the touch screen panel through the glass window panel and the user finger touches the touch screen, the touch screen is touched by the touch screen; and the change of the capacitance signal can still be accurately measured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the industrial explosion -proof measurement technical field, concretely relates to a circuit module for explosion -proof touch screen. BACKGROUND

[0002] In industrial production, the production field such as petroleum, chemical industry, coal will inevitably form explosive hazardous environment;And in the production process, the detection and production equipment are needed, and the explosion source is introduced. In order to the safety of production, the design of these equipment used in hazardous area needs to reach the requirement of explosion -proof grade. The normal operation of equipment needs man -machine interaction, due to the requirement of explosion -proof grade, the display touch screen of man -machine interaction cannot be directly exposed in hazardous area, and needs to be placed in explosion -proof box.

[0003] Resistance touch screen is used as man -machine interaction mode in many equipment due to its low cost and good environmental adaptability;But resistance touch screen obtains position information by changing the resistance between two conductive layers by user exerting pressure on screen surface, and the existence of glass window makes user unable to directly exert pressure on display screen surface, leading to unable man -machine interaction;Some manufacturers solve this problem by making the window structure into openable and closable cover structure, and when needing to set parameters, then unscrewing the screw and opening the window;But this operation can damage the explosion -proof box, leading to that the explosion -proof box still cannot operate in hazardous area.

[0004] Capacitive touch screen capacitive screen control chip generates driving signal periodically, and then is received by receiving electrode, and the charge size is measured. When capacitive screen is pressed, it is equivalent to introducing new capacitance for electrode, thereby changing the charge size measured by receiving electrode to obtain position information. But in the requirement of explosion -proof grade, the thickness of glass window makes that the capacitive sensor adopted by existing capacitive screen cannot accurately identify position information.

[0005] Therefore, it is urgent to need a circuit module for explosion -proof touch screen, which can improve the driving voltage provided to signal acquisition module, thereby improving the threshold of built -in capacitive sensor of touch screen, so that when user's finger touches touch screen, the built -in capacitive sensor can still accurately measure the change of capacitance when user's finger touches touch screen through glass window panel between user's finger and touch screen panel. UTILITY MODEL CONTENTS

[0006] To solve the above problems, the utility model provides a circuit module for explosion -proof touch screen, improves the voltage of signal acquisition module driving electrode plate connected with touch screen through the high -voltage charge pump integrated in microcontroller, and the built -in sensor of touch screen can still accurately measure the change of capacitive signal even through the glass window designed according to explosion -proof grade, thereby improving the threshold of capacitive touch of touch screen.

[0007] The utility model discloses a technical scheme is:

[0008] The utility model provides a circuit module for explosion -proof touch screen, including microcontroller and signal acquisition module, signal acquisition module is used for connecting touch screen, and microcontroller provides drive voltage for signal acquisition module, and its sending end and receiving end are connected with signal acquisition module, and microcontroller includes high -voltage charge pump and a plurality of electric capacity, is used for through the charge of electric capacity and discharges drive voltage of signal acquisition module supply is raised, and the sending end of microcontroller sends the alternating current drive signal to touch screen through signal acquisition module, and the receiving end receives the signal that touch screen returns through signal acquisition module.

[0009] Further, the chip model of the microcontroller is ILI2511.

[0010] Further, the signal acquisition module includes a drive electrode plate, and the drive electrode plate is connected to the microcontroller.

[0011] Further, the signal acquisition module is connected to a sensor built-in in the touch screen, and the signal acquisition module includes a TX transmitter and a RX receiver, one end of the TX transmitter is connected to the transmitting end of the microcontroller, the other end is connected to the touch screen, one end of the RX receiver is connected to the receiving end of the microcontroller, and the other end is connected to the touch screen.

[0012] Further, the high-voltage charge pump cooperates with the capacitor to raise the drive voltage of 3.3V or 5V to 20V.

[0013] Further, the utility model also includes a communication module, and the microcontroller is connected to a main control module through the communication module, the main control module includes a first pin and a second pin, and the first pin and the second pin are respectively used as an SCK clock line and an SCL data line for IIC communication.

[0014] Further, the main control module includes a third pin and a fourth pin, and the third pin and the fourth pin are respectively connected to the drive electrode plate as a RESET reset line and an INT interrupt line.

[0015] Further, the main control module uses a control chip with a model of STM32H743.

[0016] The utility model discloses the beneficial effect:

[0017] The utility model discloses through the high-voltage charge pump in the microcontroller, cooperates with the capacitor and charges and discharges, raises the drive voltage of signal acquisition module supply, improves the threshold value of electric capacity touch, when the user's finger and touch screen panel are apart from the glass window panel, when the user's finger touches the touch screen, still can accurately measure the change of electric capacity signal. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Figure 1 is a connection schematic diagram of the circuit module for the explosion-proof touch screen of the utility model embodiment 1 and the explosion-proof touch screen and the host computer.

[0019] Figure 2 Figure 2 is a microcontroller circuit schematic diagram of the circuit module for the explosion-proof touch screen of the utility model embodiment 1.

[0020] Figure 3 Figure 3 is a main control module circuit schematic diagram of the circuit module for the explosion-proof touch screen of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings and a preferred embodiment.

[0022] The utility model provides a kind of circuit module for explosion-proof touch screen, refer to Figure 1 , circuit module one end connects host computer, the other end connects touch panel, so that host computer and touch panel communicate, touch panel is placed in explosion-proof box body, and staff can still normally use touch panel to carry out man-machine interaction under the condition of explosion-proof box body window.

[0023] The utility model a kind of circuit module for explosion-proof touch screen includes microcontroller and signal acquisition module, microcontroller specifically uses ILI2511 chip, signal acquisition module is used to connect the capacitive sensor built-in in touch screen, signal acquisition module includes TX transmitter and RX receiver, TX transmitter one end connects the transmitting end of microcontroller, the other end connects the capacitive sensor built-in in touch screen, RX receiver one end connects the receiving end of microcontroller, the other end connects the capacitive sensor built-in in touch screen;Microcontroller provides drive voltage to signal acquisition module, and its transmitting end and receiving end and the drive electrode plate of signal acquisition module are connected, the drive electrode plate of signal acquisition module is connected to the built-in capacitive sensor of touch screen, drive voltage is used for the detection of built-in capacitive sensor of touch screen, touch screen is placed in explosion-proof box body and tightly sticks to box body, microcontroller includes high-voltage charge pump and multiple capacitors, for the drive voltage of signal acquisition module is raised by the charge and discharge of capacitor, the transmitting end of microcontroller sends alternating current drive signal to touch screen through signal acquisition module, and receiving end receives the signal that touch screen returns through signal acquisition module.

[0024] Refer to Figure 2The utility model discloses a kind of microcontroller integrated with high-voltage charge pump for the circuit module of explosion-proof touch screen, and microcontroller is a kind of single-chip microcomputer capacitive touch sensor controller, and microcontroller specifically uses ILI2511 chip, it integrates high-speed capacitor-to-digital converter (CDC), a total of 65 channels, chip inside has driving sensing channel, high-voltage charge pump and 32-bit high-performance microcontroller (MCU).Support the maximum TX channel and RX channel total number is 65, there are 18 channels can be made TX channel, also can be made RX channel, other channels can only be made TX channel or only can be made RX channel, the TX channel of microcontroller as sending end, RX channel as receiving end.

[0025] Microcontroller has VTX, VGH, EPAD, C2N, C2P, CIN, CIP, C0N and C0P pins, and the plurality of capacitors connected to the microcontroller are capacitors C6, C7, C8, C9 and C10, C0P and C0N are the positive and negative poles of the first stage of the charge pump, C1P and C1N are the positive and negative poles of the second stage of the charge pump, C2P and C2N are the positive and negative poles of the third stage of the charge pump, one end of the capacitor C6 is connected to the VTX pin, one end of the capacitor C7 is connected to the VGH pin, the other ends of C6 and C7 are connected and grounded, and the high-voltage charge pump cooperates with the capacitors C6 and C7 to charge and discharge, to raise the driving voltage of 3.3V or 5V supplied to the signal acquisition module to about 20V, improve the threshold of the built-in capacitive sensor of the touch screen and the anti-interference capability of the signal acquisition module, make the touch screen more sensitive, so that when the user's finger contacts the explosion-proof box body, the built-in capacitive sensor of the touch screen can detect the change of the capacitance and identify the touch event. One end of C8 is connected to C2N, the other end is connected to C2P, one end of C9 is connected to CIN, the other end is connected to CIP, one end of C10 is connected to C0N, the other end is connected to C0P, C8, C9 and C10, C0P, C0N, C1P, C1N and C2P, C2N pins are used to connect capacitors C8, C9 and C10, and participate in the work of the charge pump.

[0026] The utility model discloses a kind of circuit modules for explosion-proof touch screen, further include communication module, microcontroller is used for and main control module communication connection by communication module, reference Figure 3 , main control module uses the control chip of model STM32H743, and main control module includes first pin PB6 and second pin PB7, and first pin PB6 and second pin PB7 are respectively as IIC communication SCK clock line and SCL data line, and main control module further includes third pin PB14 and fourth pin PB15, and third pin PB14 and fourth pin PB15 are respectively as RESET reset line and INT interrupt line and are connected to driving electrode plate.

[0027] The working procedure of the embodiment in specific application is as follows: when the power is powered on, the main control chip is powered on first, and the preset program is matched to pull the low RESET reset line level through the control PB14 pin, so that the ILI2511 is in a reset state, when the main control circuit and the signal acquisition circuit are normally powered on, the RESET reset level is pulled high, and the working instruction is sent through IIC, so that the ILI2511 starts to work normally; after the microcontroller is powered on, the internal integrated high-voltage charge pump is controlled to cooperate with the output capacitors C6 and C7 to start charging and discharging, so that the power input voltage of 3.3V or 5V is increased to 20V, the touch threshold of the built-in capacitive sensor of the touch screen is improved, the built-in capacitive sensor of the touch screen can detect the change of the capacitance under the condition of being separated by a glass window, a touch event is detected, the microcontroller sends an alternating current driving signal to the built-in capacitive sensor of the touch screen through the transmitting end, receives the signal returned by the touch screen sensor through the receiving end, and judges the touch state by measuring the capacitance charging and discharging time difference according to the prior art, that is, the working principle of most capacitive touch screens on the market, when the touch state is judged, a touch signal is sent to the main control module, the INT interrupt line of the main control module appears a falling edge according to the preset program, the main control triggers an interrupt event to start reading the SCL data line data, the touch signal of the microcontroller is received in real time, the main control module analyzes the touch signal in real time according to the prior art, such as the method for recognizing a touch signal of a capacitive touch screen with the publication number CN115373543A, determines the touch point position, judges the touch point position, judges whether the user contacts the touch screen is an effective touch, obtains an analysis and judgment result, and filters and processes the effective touch point position in the touch point position according to the analysis and judgment result, and obtains touch signal recognition information according to the effective touch point position.

[0028] After the microcontroller of the utility model is powered on, the high-voltage charge pump cooperates with the capacitor to charge and discharge, the driving voltage supplied to the signal acquisition module is increased to about 20V, the threshold of the built-in capacitive sensor of the touch screen and the anti-interference ability of the signal acquisition module are improved, the touch screen is more sensitive, and therefore the built-in sensor of the touch screen can still accurately measure the change of the capacitance signal even through the glass window designed according to the explosion-proof level.

[0029] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principle of the utility model, and these improvements and refinements are also within the protection scope of the utility model.

Claims

1. A circuit module for an explosion-proof touch screen, characterized in that The microcontroller and a signal acquisition module are included, the signal acquisition module is used for connecting a touch screen, the microcontroller provides a driving voltage for the signal acquisition module, and a sending end and a receiving end of the microcontroller are connected with the signal acquisition module, the microcontroller includes a high-voltage charge pump and a plurality of capacitors, the driving voltage supplied to the signal acquisition module is raised by charging and discharging of the capacitors, the sending end of the microcontroller sends an alternating current driving signal to the touch screen through the signal acquisition module, and the receiving end receives a signal returned by the touch screen through the signal acquisition module.

2. The circuit module for an explosion-proof touch screen according to claim 1, characterized in that, The chip model of the microcontroller is ILI2511.

3. The circuit module for an explosion-proof touch screen according to claim 1, wherein The signal acquisition module includes a driving electrode plate, and the driving electrode plate is connected with the microcontroller.

4. The circuit module for an explosion-proof touch screen according to claim 1, wherein The signal acquisition module is connected with a sensor built in the touch screen, the signal acquisition module includes a TX transmitter and a RX receiver, one end of the TX transmitter is connected with the sending end of the microcontroller, the other end is connected with the touch screen, one end of the RX receiver is connected with the receiving end of the microcontroller, and the other end is connected with the touch screen.

5. The circuit module for an explosion-proof touch screen according to claim 1, wherein The high-voltage charge pump cooperates with the capacitors to raise the driving voltage of 3.3V or 5V to 20V.

6. The circuit module for an explosion-proof touch screen according to claim 1, wherein A communication module is further included, the microcontroller is used for communication connection with a master control module through the communication module, the master control module includes a first pin and a second pin, the first pin and the second pin are respectively used as an SCK clock line and an SCL data line of IIC communication.

7. The circuit module for an explosion-proof touch screen according to claim 6, characterized in that The master control module includes a third pin and a fourth pin, the third pin and the fourth pin are respectively connected to the driving electrode plate as a RESET reset line and an INT interrupt line.

8. The circuit module for an explosion-proof touch screen according to claim 6, wherein The master control module adopts a control chip with a model of STM32H743.

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