CN216052985U - Intrinsically safe embedded touch screen - Google Patents
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- CN216052985U CN216052985U CN202121931638.9U CN202121931638U CN216052985U CN 216052985 U CN216052985 U CN 216052985U CN 202121931638 U CN202121931638 U CN 202121931638U CN 216052985 U CN216052985 U CN 216052985U
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Abstract
The utility model relates to an intrinsically safe embedded touch screen which comprises a shell and a touch screen body, wherein the touch screen body is embedded into the shell, a closed cavity is formed between the touch screen body and the shell, a CPU (central processing unit) mainboard, an intrinsically safe touch screen driving circuit and an intrinsically safe power supply are arranged in the closed cavity, the intrinsically safe power supply is respectively connected with the CPU mainboard and the touch screen body, and the CPU mainboard is connected with the touch screen body through the intrinsically safe touch screen driving circuit; the intrinsic safety power supply is arranged on an arc extinguishing plug, and the arc extinguishing plug is positioned outside the shell and is connected with the intrinsic safety power supply through a power supply line; an intrinsic safety data interface is further embedded in the shell and connected with the CPU mainboard. The utility model adopts the intrinsic safety power supply to supply power to the CPU mainboard and the touch screen body, thereby ensuring the safety of power supply; in addition, the power supply plug also adopts an arc extinguishing plug, so that sparks can be avoided in the process of plugging the power supply plug; meanwhile, the data interface connected to the CPU mainboard also adopts an intrinsic safety data interface, so that the safety under the mine is ensured from all aspects.
Description
Technical Field
The utility model relates to a touch screen, in particular to an intrinsically safe embedded touch screen.
Background
Because the mine is always in danger of methane explosive gas and coal dust explosion, the working environment of various underground mining electric control systems is severe. At present, many mining electric control systems are provided with independent display screens, the independent display screens adopt common display screens, once a circuit of the display screens breaks down to cause sparks, explosion is easy to cause, and serious threats can be caused to the underground safety of mines.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an intrinsically safe embedded touch screen which is powered by an intrinsic safety power supply and is provided with an arc extinguishing plug and an intrinsic safety data interface, so that sparks generated after a circuit of a display screen breaks down can be completely eradicated, mine explosion is avoided, and the safety under a mine is improved.
The technical scheme for solving the technical problems is as follows: an intrinsically safe embedded touch screen comprises a shell and a touch screen body, wherein the touch screen body is embedded into the shell, a closed cavity is formed between the touch screen body and the shell, and an intrinsically safe circuit is arranged in the closed cavity; the intrinsic safety circuit comprises a CPU mainboard, an intrinsic safety touch screen driving circuit and an intrinsic safety power supply, the intrinsic safety power supply is respectively connected with the CPU mainboard and the touch screen body and respectively supplies power to the CPU mainboard and the touch screen body, and the CPU mainboard is connected with the touch screen body through the intrinsic safety touch screen driving circuit; the intrinsic safety power supply is matched with an arc extinguishing plug, and the arc extinguishing plug is positioned outside the shell and is connected with the intrinsic safety power supply through a power supply line penetrating through the shell; an intrinsic safety data interface is further embedded in the shell and connected with the CPU mainboard.
The utility model has the beneficial effects that: the intrinsically safe embedded touch screen adopts the intrinsic safety power supply to supply power to the CPU mainboard and the touch screen body, so that the power supply safety is ensured; in addition, the power supply plug also adopts an arc extinguishing plug, so that sparks can be avoided in the process of plugging the power supply plug; meanwhile, the data interface connected to the CPU mainboard also adopts an intrinsic safety data interface, so that the safety under the mine is ensured from all aspects.
On the basis of the technical scheme, the utility model can be further improved as follows.
Further, the intrinsically safe touch screen driving circuit comprises a protection sub-circuit and a driving sub-circuit; the CPU main board is connected with the touch screen body through the driving sub-circuit, and the protection sub-circuit is respectively connected with the CPU main board and the driving sub-circuit.
The beneficial effect of adopting the further scheme is that: the intrinsically safe touch screen driving circuit is used for driving the touch screen body to work, and the protective sub-circuit is arranged in the intrinsically safe touch screen driving circuit, so that the safety of the intrinsically safe embedded touch screen in the underground work can be further improved.
Further, the protection sub-circuit comprises a transistor Q1, a triode Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1 and a capacitor C1; the source of the transistor Q1 is grounded, the drain of the transistor Q1 is connected to the base of the triode Q2, the gate of the transistor Q1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is connected to the voltage VCC, and the gate of the transistor Q1 and the collector of the triode Q2 are both connected to the CPU board through the resistor R5; one end of the resistor R1 is connected to the driving sub-circuit, the other end of the resistor R1 is grounded through the inductor L1, one end of the resistor R2 is connected to the driving sub-circuit, the other end of the resistor R2 is grounded through the capacitor C1, one end of the resistor R3 is connected to the driving sub-circuit, and the other end of the resistor R3 is grounded through the resistor R4.
The beneficial effect of adopting the further scheme is that: the protection sub-circuit with the structure has overvoltage protection, short-circuit protection and differential pressure protection, and is simple in structure but comprehensive in protection effect.
Further, the driving sub-circuit comprises a transistor Q3, a transistor Q4, a transistor Q5 and a transistor Q6; the base electrode of the triode Q3 is connected to the first video output end of the CPU mainboard through a resistor R6, the emitter electrode of the triode Q3 is connected to the resistor R1 through a resistor R7, the collector electrode of the triode Q3 is connected to the resistor R2 through a resistor R8, the collector electrode of the triode Q3 is grounded through a capacitor C2, and the collector electrode of the triode Q3 is connected to the X + interface of the touch screen body; the base electrode of the triode Q4 is connected to the second video output end of the CPU mainboard through a resistor R9, the emitter electrode of the triode Q4 is connected to the resistor R1 through a resistor R10, the collector electrode of the triode Q4 is connected to the resistor R3 through a resistor R11, the collector electrode of the triode Q4 is grounded through a capacitor C3, and the collector electrode of the triode Q4 is connected to the Y + interface of the touch screen body; the base electrode of the triode Q5 is connected to the third video output end of the CPU mainboard through a resistor R12, the emitter electrode of the triode Q5 is grounded, and the collector electrode of the triode Q5 is connected to the X-interface of the touch screen body; the base electrode of the triode Q6 is connected to the fourth video output end of the CPU mainboard through a resistor R13, the emitter electrode of the triode Q6 is grounded, and the collector electrode of the triode Q6 is connected to the Y-interface of the touch screen body.
Further, the intrinsic safety power supply comprises an isolation transformer, an AC-DC converter and a voltage stabilizer, and a secondary coil of the isolation transformer is respectively connected with the CPU main board and the touch screen body sequentially through the AC-DC converter and the voltage stabilizer.
Further, the arc extinguishing plug is connected with the primary coil of the isolation transformer through the power supply line.
Further, the intrinsically safe data interface is specifically an intrinsically safe USB data interface.
Furthermore, the intrinsically safe USB data interface comprises a USB interface body and a USB isolation circuit, wherein the USB interface body is connected with the CPU mainboard through the USB isolation circuit.
Further, the USB isolation circuit includes three sets of USB isolation sub-circuits, and the positive data interface, the negative data interface, and the power interface of the USB interface body are respectively connected to the CPU board through the corresponding USB isolation sub-circuits.
Further, the three groups of USB isolation sub-circuits are respectively a first USB isolation sub-circuit, a second USB isolation sub-circuit and a third USB isolation sub-circuit; the first USB isolation sub-circuit comprises a diode D1, a diode D2 and a resistor R14; the forward data interface of the USB interface body is connected with a data input interface of the CPU mainboard through the resistor R14; the cathode of the diode D1 and the cathode of the diode D2 are both connected with the forward data interface of the USB interface body, and the anode of the diode D1 and the anode of the diode D2 are both grounded; the second USB isolation sub-circuit comprises a diode D3, a diode D4 and a resistor R15; the negative data interface of the USB interface body is connected with the other data input interface of the CPU mainboard through the resistor R15; the cathode of the diode D3 and the cathode of the diode D4 are both connected with the negative data interface of the USB interface body, and the anode of the diode D3 and the anode of the diode D4 are both grounded; the third USB isolation sub-circuit comprises a diode D5, a diode D6 and a resistor R16; the power interface of the USB interface body is connected with the VCC interface of the CPU mainboard through the resistor R16; the cathode of the diode D5 and the cathode of the diode D6 are both connected with the power interface of the USB interface body, and the anode of the diode D5 and the anode of the diode D6 are both grounded.
The beneficial effect of adopting the further scheme is that: the USB isolation circuit with the structure can isolate and limit current and voltage, and can limit the energy input into a CPU mainboard within a safe range value, so that the energy of electric sparks or heat effects possibly generated inside the electrical equipment with the touch screen or on connecting wires exposed to a potentially explosive environment can be limited to a level that ignition cannot be generated.
Drawings
FIG. 1 is a block diagram of the overall structure of an intrinsically safe embedded touch screen according to the present invention;
FIG. 2 is a block diagram of an intrinsically safe touch screen driving circuit;
FIG. 3 is a schematic diagram of a specific circuit structure of the protection sub-circuit;
FIG. 4 is a schematic diagram of a specific circuit structure of a driving sub-circuit
FIG. 5 is a block diagram of an intrinsically safe power supply;
fig. 6 is a schematic diagram of a specific circuit structure of the USB isolation circuit.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1, an intrinsically safe embedded touch screen includes a housing and a touch screen body, wherein the touch screen body is embedded in the housing and forms a closed cavity with the housing, and an intrinsically safe circuit is arranged in the closed cavity; the intrinsic safety circuit comprises a CPU mainboard, an intrinsic safety touch screen driving circuit and an intrinsic safety power supply, the intrinsic safety power supply is respectively connected with the CPU mainboard and the touch screen body and respectively supplies power to the CPU mainboard and the touch screen body, and the CPU mainboard is connected with the touch screen body through the intrinsic safety touch screen driving circuit; the intrinsic safety power supply is matched with an arc extinguishing plug, and the arc extinguishing plug is positioned outside the shell and is connected with the intrinsic safety power supply through a power supply line penetrating through the shell; an intrinsic safety data interface is further embedded in the shell and connected with the CPU mainboard.
The intrinsically safe embedded touch screen adopts the intrinsic safety power supply to supply power to the CPU mainboard and the touch screen body, so that the power supply safety is ensured; in addition, the power supply plug also adopts an arc extinguishing plug, so that sparks can be avoided in the process of plugging the power supply plug; meanwhile, the data interface connected to the CPU mainboard also adopts an intrinsic safety data interface, so that the safety under the mine is ensured from all aspects.
In this particular embodiment: as shown in fig. 2, the intrinsically safe touch screen driving circuit includes a protection sub-circuit and a driving sub-circuit; the CPU main board is connected with the touch screen body through the driving sub-circuit, and the protection sub-circuit is respectively connected with the CPU main board and the driving sub-circuit.
The intrinsically safe touch screen driving circuit is used for driving the touch screen body to work, and the protective sub-circuit is arranged in the intrinsically safe touch screen driving circuit, so that the safety of the intrinsically safe embedded touch screen in the underground work can be further improved.
Specifically, as shown in fig. 3, the protection sub-circuit includes a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1, and a capacitor C1; the source of the transistor Q1 is grounded, the drain of the transistor Q1 is connected to the base of the triode Q2, the gate of the transistor Q1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is connected to the voltage VCC, and the gate of the transistor Q1 and the collector of the triode Q2 are both connected to the CPU board through the resistor R5; one end of the resistor R1 is connected to the driving sub-circuit, the other end of the resistor R1 is grounded through the inductor L1, one end of the resistor R2 is connected to the driving sub-circuit, the other end of the resistor R2 is grounded through the capacitor C1, one end of the resistor R3 is connected to the driving sub-circuit, and the other end of the resistor R3 is grounded through the resistor R4.
The protection sub-circuit with the structure has overvoltage protection, short-circuit protection and differential pressure protection, and is simple in structure but comprehensive in protection effect.
Overvoltage protection: when an overvoltage signal is input from the resistor R2, the base of the triode Q2 is pulled to a low level, the triode Q2 is conducted, and therefore the grid of the transistor Q1 is pulled high and enters a self-locking state, and the system can be restarted after power failure, and overvoltage protection is achieved.
Short-circuit protection: when a short-circuit signal is input from the resistor R3, the short-circuit signal is input to the grid electrode of the transistor Q1 through the triode Q2, so that the source electrode and the drain electrode of the transistor Q1 are conducted, the voltage of the drain electrode is pulled low, and the triode Q1 is conducted to form self-locking; similarly, the protection needs to be powered up again to be released, and then short-circuit protection is realized.
Differential pressure protection: when the input voltage has a voltage difference, a voltage difference signal is input to the gate of the transistor Q1 from the resistor R1, the level of the drain electrode of the transistor Q1 is pulled low, the triode Q2 is conducted, and self-locking is formed, so that voltage difference protection is realized.
The protection sub-circuit of the utility model adopts the transistor Q1, realizes overvoltage, short circuit and differential pressure protection by depending on the on-off state of the transistor Q1, and has simple circuit structure, low cost, safety and reliability.
Specifically, as shown in fig. 4, the driving sub-circuit includes a transistor Q3, a transistor Q4, a transistor Q5, and a transistor Q6; the base electrode of the triode Q3 is connected to the first video output end of the CPU mainboard through a resistor R6, the emitter electrode of the triode Q3 is connected to the resistor R1 through a resistor R7, the collector electrode of the triode Q3 is connected to the resistor R2 through a resistor R8, the collector electrode of the triode Q3 is grounded through a capacitor C2, and the collector electrode of the triode Q3 is connected to the X + interface of the touch screen body; the base electrode of the triode Q4 is connected to the second video output end of the CPU mainboard through a resistor R9, the emitter electrode of the triode Q4 is connected to the resistor R1 through a resistor R10, the collector electrode of the triode Q4 is connected to the resistor R3 through a resistor R11, the collector electrode of the triode Q4 is grounded through a capacitor C3, and the collector electrode of the triode Q4 is connected to the Y + interface of the touch screen body; the base electrode of the triode Q5 is connected to the third video output end of the CPU mainboard through a resistor R12, the emitter electrode of the triode Q5 is grounded, and the collector electrode of the triode Q5 is connected to the X-interface of the touch screen body; the base electrode of the triode Q6 is connected to the fourth video output end of the CPU mainboard through a resistor R13, the emitter electrode of the triode Q6 is grounded, and the collector electrode of the triode Q6 is connected to the Y-interface of the touch screen body.
Four triodes (triodes Q3-Q6, two NPN transistors and two PNP transistors), an additional bias resistor (resistor R6, resistor R8, resistor R9, electron R11, resistor R12 and resistor R13), a pull-up resistor (resistor R7 and resistor R10) and a filter capacitor (capacitor C2 and capacitor C3), as shown in fig. 3, where: one end of the resistor R6, one end of the resistor R9, one end of the resistor R12 and one end of the resistor R13 are respectively controlled by a GPC0 pin, a GPC1 pin, a GPC2 pin and a GPC3 pin of a CPU mainboard (on which an ARM7TDM I based S3C44B0X embedded microprocessor is integrated). X +, Y +, X-and Y-are respectively connected to an A/D conversion input interface in the touch screen body.
In this particular embodiment: as shown in fig. 5, the intrinsically safe power supply includes an isolation transformer, an AC-DC converter, and a voltage stabilizer, and a secondary coil of the isolation transformer is respectively connected to the CPU board and the touch screen body through the AC-DC converter and the voltage stabilizer in sequence.
Specifically, the arc extinguishing plug is connected with the primary coil of the isolation transformer through the power supply line. The arc extinguishing plug comprises a shell, a pin and a power supply line, wherein the pin and the power supply line are embedded on the shell, a pin conductor electrically connected with the pin and a power supply line conductor electrically connected with the power supply line are arranged in the shell, the pin conductor is separated from the power supply line conductor, an elastic transition connecting piece is further arranged in the shell, and the elastic transition connecting piece is respectively electrically connected with the pin conductor and the power supply line conductor in the plugging process of the arc extinguishing plug to conduct the pin and the power supply line; the elastic transition connecting piece is respectively disconnected with the pin conductor and the power supply line conductor in the process of pulling out the arc extinguishing plug, and the pin and the power supply line are disconnected. The arc extinguishing plug of this structure can play the effect of arc extinguishing, avoids producing the spark to guarantee the safety under the mine.
In this particular embodiment: the intrinsically safe data interface is specifically an intrinsically safe USB data interface. Specifically, the intrinsically safe USB data interface includes a USB interface body and a USB isolation circuit, and the USB interface body is connected to the CPU motherboard through the USB isolation circuit. The USB isolation circuit comprises three groups of USB isolation sub-circuits, and the positive data interface, the negative data interface and the power interface of the USB interface body are respectively connected with the CPU mainboard through the corresponding USB isolation sub-circuits.
Further, as shown in fig. 6, the three groups of USB isolation sub-circuits are a first USB isolation sub-circuit, a second USB isolation sub-circuit and a third USB isolation sub-circuit, respectively; the first USB isolation sub-circuit comprises a diode D1, a diode D2 and a resistor R14; the forward data interface of the USB interface body is connected with a data input interface of the CPU mainboard through the resistor R14; the cathode of the diode D1 and the cathode of the diode D2 are both connected with the forward data interface of the USB interface body, and the anode of the diode D1 and the anode of the diode D2 are both grounded; the second USB isolation sub-circuit comprises a diode D3, a diode D4 and a resistor R15; the negative data interface of the USB interface body is connected with the other data input interface of the CPU mainboard through the resistor R15; the cathode of the diode D3 and the cathode of the diode D4 are both connected with the negative data interface of the USB interface body, and the anode of the diode D3 and the anode of the diode D4 are both grounded; the third USB isolation sub-circuit comprises a diode D5, a diode D6 and a resistor R16; the power interface of the USB interface body is connected with the VCC interface of the CPU mainboard through the resistor R16; the cathode of the diode D5 and the cathode of the diode D6 are both connected with the power interface of the USB interface body, and the anode of the diode D5 and the anode of the diode D6 are both grounded.
Three groups of USB isolation subcircuits of the USB isolation circuit respectively carry out current limiting and voltage limiting on USB power supply, signal negative and signal positive, wherein the USB power supply is limited to have a voltage not exceeding 6.8V and a current not exceeding 200mA, the signal negative and the signal positive are limited to have a voltage not exceeding 6.8V and a current not exceeding 50 mA. The packaging form of the current limiting resistor (the resistor R14, the resistor R15 and the resistor R16) adopts a winding power resistor, and has a measure for preventing loosening when the wire is broken, and the fault mode of the winding power resistor only has open-circuit fault.
The USB isolation circuit with the structure can isolate and limit current and voltage, and can limit the energy input into a CPU mainboard within a safe range value, so that the energy of electric sparks or heat effects possibly generated inside the electrical equipment with the touch screen or on connecting wires exposed to a potentially explosive environment can be limited to a level that ignition cannot be generated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An intrinsically safe embedded touch screen is characterized in that: the touch screen comprises a shell and a touch screen body, wherein the touch screen body is embedded into the shell, a closed cavity is formed between the touch screen body and the shell, and an intrinsic safety circuit is arranged in the closed cavity; the intrinsic safety circuit comprises a CPU mainboard, an intrinsic safety touch screen driving circuit and an intrinsic safety power supply, the intrinsic safety power supply is respectively connected with the CPU mainboard and the touch screen body and respectively supplies power to the CPU mainboard and the touch screen body, and the CPU mainboard is connected with the touch screen body through the intrinsic safety touch screen driving circuit; the intrinsic safety power supply is provided with an arc extinguishing plug, and the arc extinguishing plug is positioned outside the shell and is connected with the intrinsic safety power supply through a power supply line penetrating through the shell; an intrinsic safety data interface is further embedded in the shell and connected with the CPU mainboard.
2. The intrinsically safe embedded touch screen of claim 1, wherein: the intrinsically safe touch screen driving circuit comprises a protection sub-circuit and a driving sub-circuit; the CPU main board is connected with the touch screen body through the driving sub-circuit, and the protection sub-circuit is respectively connected with the CPU main board and the driving sub-circuit.
3. The intrinsically safe embedded touch screen of claim 2, wherein: the protection sub-circuit comprises a transistor Q1, a triode Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an inductor L1 and a capacitor C1; the source of the transistor Q1 is grounded, the drain of the transistor Q1 is connected to the base of the triode Q2, the gate of the transistor Q1 is connected to the collector of the triode Q2, the emitter of the triode Q2 is connected to the voltage VCC, and the gate of the transistor Q1 and the collector of the triode Q2 are both connected to the CPU board through the resistor R5; one end of the resistor R1 is connected to the driving sub-circuit, the other end of the resistor R1 is grounded through the inductor L1, one end of the resistor R2 is connected to the driving sub-circuit, the other end of the resistor R2 is grounded through the capacitor C1, one end of the resistor R3 is connected to the driving sub-circuit, and the other end of the resistor R3 is grounded through the resistor R4.
4. The intrinsically safe embedded touch screen of claim 3, wherein: the driving sub-circuit comprises a triode Q3, a triode Q4, a triode Q5 and a triode Q6; the base electrode of the triode Q3 is connected to the first video output end of the CPU mainboard through a resistor R6, the emitter electrode of the triode Q3 is connected to the resistor R1 through a resistor R7, the collector electrode of the triode Q3 is connected to the resistor R2 through a resistor R8, the collector electrode of the triode Q3 is grounded through a capacitor C2, and the collector electrode of the triode Q3 is connected to the X + interface of the touch screen body; the base electrode of the triode Q4 is connected to the second video output end of the CPU mainboard through a resistor R9, the emitter electrode of the triode Q4 is connected to the resistor R1 through a resistor R10, the collector electrode of the triode Q4 is connected to the resistor R3 through a resistor R11, the collector electrode of the triode Q4 is grounded through a capacitor C3, and the collector electrode of the triode Q4 is connected to the Y + interface of the touch screen body; the base electrode of the triode Q5 is connected to the third video output end of the CPU mainboard through a resistor R12, the emitter electrode of the triode Q5 is grounded, and the collector electrode of the triode Q5 is connected to the X-interface of the touch screen body; the base electrode of the triode Q6 is connected to the fourth video output end of the CPU mainboard through a resistor R13, the emitter electrode of the triode Q6 is grounded, and the collector electrode of the triode Q6 is connected to the Y-interface of the touch screen body.
5. The intrinsically safe embedded touch screen of any one of claims 1 to 4, wherein: the intrinsic safety power supply comprises an isolation transformer, an AC-DC converter and a voltage stabilizer, wherein a secondary coil of the isolation transformer is respectively connected with the CPU mainboard and the touch screen body sequentially through the AC-DC converter and the voltage stabilizer.
6. The intrinsically safe embedded touch screen of claim 5, wherein: the arc extinguishing plug is connected with the primary coil of the isolation transformer through the power supply line.
7. The intrinsically safe embedded touch screen of any one of claims 1 to 4, wherein: the intrinsically safe data interface is specifically an intrinsically safe USB data interface.
8. The intrinsically safe embedded touch screen of claim 7, wherein: the intrinsically safe USB data interface comprises a USB interface body and a USB isolation circuit, wherein the USB interface body is connected with the CPU mainboard through the USB isolation circuit.
9. The intrinsically safe embedded touch screen of claim 8, wherein: the USB isolation circuit comprises three groups of USB isolation sub-circuits, and the positive data interface, the negative data interface and the power interface of the USB interface body are respectively connected with the CPU mainboard through the corresponding USB isolation sub-circuits.
10. The intrinsically safe embedded touch screen of claim 9, wherein: the three groups of USB isolation sub-circuits are respectively a first USB isolation sub-circuit, a second USB isolation sub-circuit and a third USB isolation sub-circuit; the first USB isolation sub-circuit comprises a diode D1, a diode D2 and a resistor R14; the forward data interface of the USB interface body is connected with a data input interface of the CPU mainboard through the resistor R14; the cathode of the diode D1 and the cathode of the diode D2 are both connected with the forward data interface of the USB interface body, and the anode of the diode D1 and the anode of the diode D2 are both grounded; the second USB isolation sub-circuit comprises a diode D3, a diode D4 and a resistor R15; the negative data interface of the USB interface body is connected with the other data input interface of the CPU mainboard through the resistor R15; the cathode of the diode D3 and the cathode of the diode D4 are both connected with the negative data interface of the USB interface body, and the anode of the diode D3 and the anode of the diode D4 are both grounded; the third USB isolation sub-circuit comprises a diode D5, a diode D6 and a resistor R16; the power interface of the USB interface body is connected with the VCC interface of the CPU mainboard through the resistor R16; the cathode of the diode D5 and the cathode of the diode D6 are both connected with the power interface of the USB interface body, and the anode of the diode D5 and the anode of the diode D6 are both grounded.
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| CN202121931638.9U CN216052985U (en) | 2021-08-16 | 2021-08-16 | Intrinsically safe embedded touch screen |
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| CN202121931638.9U CN216052985U (en) | 2021-08-16 | 2021-08-16 | Intrinsically safe embedded touch screen |
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