Pressure control device

Abstract

The utility model relates to a pressure control device, which belongs to the technical field of monitoring equipment and comprises a pressure sensor, a pressure signal conditioning circuit, a master control circuit, a relay control circuit, a display circuit and a power supply circuit for supplying power to the whole device. The pressure sensor is connected to the input end of the pressure signal conditioning circuit, the output end of the pressure signal conditioning circuit is connected to the input end of the main control circuit through a 2IC bus, and the relay control circuit and the display circuit are both connected to the output end of the main control circuit. According to the utility model, the relay control circuit is introduced, so that the main control circuit can directly drive a high-power load without relying on a microcontroller in a controlled device for secondary conversion, thereby reducing the problem of unstable control caused by the fault of the microcontroller or communication delay, and enhancing the overall stability and response speed of the system.

Description

Technical Field

[0001] This utility model belongs to the field of monitoring equipment technology, and specifically relates to a pressure control device. Background Technology

[0002] Pressure control devices play a crucial role in industrial production, environmental monitoring, and various automated control systems. Their core function is to accurately sense changes in external pressure and adjust corresponding actuators accordingly to achieve precise control of the system state. Early pressure control devices primarily relied on simple mechanical pressure gauges, whose detection accuracy was limited and could not meet the increasingly stringent pressure precision requirements of modern applications. With the development of electronic technology, some electronic pressure control devices have emerged; however, existing pressure control devices face a series of challenges and shortcomings in their design and application.

[0003] On the one hand, the signal conditioning circuit of the pressure sensor in traditional pressure control devices often adopts a relatively simple circuit structure, and the signal amplification and other processing are not refined enough, resulting in low signal quality and susceptibility to external interference, which in turn affects the accuracy of subsequent measurement and control.

[0004] On the other hand, the control principle of traditional pressure control devices is relatively simple. It mainly involves the main control module of the pressure control device sending control commands to the microcontroller of the controlled equipment to achieve equipment startup and control. However, this design has a significant drawback: the main control module cannot directly drive the controlled equipment, but must rely on the microcontroller inside the controlled equipment for secondary conversion. This indirect control mode not only increases the complexity of the system, but may also lead to inaccurate or untimely execution of control commands due to microcontroller failure or communication delays, thus affecting the system's stability and response speed. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, where traditional pressure control devices cannot directly drive the controlled equipment and must rely on the microcontroller inside the controlled equipment for secondary conversion. This can lead to inaccurate and untimely execution of control commands due to microcontroller failure or communication delays, affecting the stability and response speed of the system. The invention provides a pressure control device to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pressure control device includes a pressure sensor, a pressure signal conditioning circuit, a main control circuit, a relay control circuit, a display circuit, and a power supply circuit that supplies power to the entire device.

[0008] The pressure sensor is connected to the input of the pressure signal conditioning circuit, and the output of the pressure signal conditioning circuit is connected to the input of the main control circuit via the 2IC bus. The relay control circuit and the display circuit are both connected to the output of the main control circuit.

[0009] Further improvements to this technical solution include a pressure signal conditioning circuit comprising a signal conditioning amplifier chip U1, resistors R1, R2, and R3, an amplifier U2, a pressure sensor interface P1, a resistor R4, a transistor Q1, a resistor R5, a field-effect transistor Q2, capacitors C1 and C2, a resistor R6, a 2IC interface P1, a resistor R7, and a capacitor C3.

[0010] The first pin of the signal conditioning amplifier chip U1 is connected to the first terminals of resistors R1 and R2. The second terminal of resistor R1 is connected to the first terminal of resistor R3 and the non-inverting input of amplifier U2. The second terminal of resistor R3 is grounded. The inverting input of amplifier U2 is connected to the first pin of pressure sensor interface P1 and the first terminal of resistor R4. The second terminal of resistor R4 is grounded. The output of amplifier U2 is connected to the second pin of pressure sensor interface P1. The second terminal of resistor R2 is connected to the base of transistor Q1. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to the first terminal of resistor R5 and the gate of field-effect transistor Q2. The second terminal of resistor R5 and the gate of field-effect transistor Q2 are connected to the... The sources of all transistors are connected to the power supply. The drain of the field-effect transistor Q2 is connected to the power supply terminal of the amplifier U2. The second pin of the signal conditioning amplifier chip U1 is connected to the third pin of the pressure sensing interface P1 and grounded through capacitor C1. The third pin of the signal conditioning amplifier chip U1 is connected to the fourth pin of the pressure sensing interface P1 and grounded through capacitor C2. The fourth pin of the signal conditioning amplifier chip U1 is connected to the first pin of the 2IC interface P2 and grounded through resistor R6. The fifth pin of the signal conditioning amplifier chip U1 is connected to the second pin of the 2IC interface P2 and grounded through resistor R7. The sixth pin of the signal conditioning amplifier chip U1 is connected to the power supply and grounded through capacitor C3.

[0011] A further improvement to this technical solution is that the signal conditioning and amplification chip U1 adopts the JHM1203 signal conditioning and amplification chip.

[0012] Further improvements to this technical solution include a main control circuit comprising a main control chip U3, resistors R8 and R9, a 2IC interface P3, resistors R10, R11, R12, and R13.

[0013] The first pin of the main control chip U3 is connected to the first end of resistor R9 and the first pin of the 2IC interface P3 through resistor R8. The second pin of the main control chip U3 is connected to the first end of resistor R11 and the second pin of the 2IC interface P3 through resistor R10. The third pin of the 2IC interface P3, the second end of resistor R9, and the second end of resistor R11 are all connected to the power supply. The third pin of the main control chip U3 is connected to the power supply through resistor R12 and grounded through capacitor C4. The fourth pin of the main control chip U3 is grounded through resistor R13.

[0014] Further improvements to this technical solution include the use of an STM32F103C8T6 microcontroller as the main control chip U3.

[0015] Further improvements to this technical solution include a relay control circuit comprising resistor R14, resistor R15, transistor Q3, diode D1, relay K1, and control interface P4.

[0016] The first end of resistor R14 is connected to the main control chip U3. The second end of resistor R14 is connected to the first end of resistor R15 and the base of transistor Q3. The second end of resistor R15 and the emitter of transistor Q3 are both grounded. The collector of transistor Q3 is connected to the positive terminal of diode D1 and the first end of the coil of relay K1. The negative terminal of diode D1 and the second end of the coil of relay K1 are both connected to the power supply. The first end of the normally open switch of relay K1 is connected to the first pin of control interface P1. The second end of the normally open switch of relay K1 is connected to the second pin of control interface P1.

[0017] Further improvements to this technical solution include a display circuit comprising resistor R16, LED D2, resistor R17, LED D3, resistor R18, LED D4, resistor R19, resistor R20, transistor Q4, resistor R21, diode D5, digital tube D6, resistors R22 to R29, transistor Q5, resistor R30, transistor Q6, resistor R31, transistor Q7, resistor R32, transistor Q8, and resistor R33.

[0018] The anode of LED D2 is connected to a 3.3V power supply, and the cathode of LED D2 is connected to the main control chip U3 through resistor R16. The anode of LED D3 is connected to a 3.3V power supply, and the cathode of LED D3 is connected to the main control chip U3 through resistor R17. The anode of LED D4 is connected to a 3.3V power supply, and the cathode of LED D4 is connected to the main control chip U3 through resistor R18. The anode of diode D5 is connected to a 3.3V power supply, and the cathode of diode D5 is connected to transistor Q4 through resistor R19. The collector of transistor Q4 is grounded, the emitter of transistor Q4 is grounded, the base of transistor Q4 is connected to the first terminals of resistor R20 and resistor R21, the second terminal of resistor R20 is grounded, the second terminal of resistor R21 is connected to the main control chip U3, the first pin of digital tube D6 is connected to the main control chip U3 through resistor R22, the second pin of digital tube D6 is connected to the main control chip U3 through resistor R23, the third pin of digital tube D6 is connected to the main control chip U3 through resistor R24, and the fourth pin of digital tube D6 is connected to the main control chip U3 through resistor R25. 3. Pin 5 of digital tube D6 is connected to the main control chip U3 through resistor R26; pin 6 of digital tube D6 is connected to the main control chip U3 through resistor R27; pin 7 of digital tube D6 is connected to the main control chip U3 through resistor R28; pin 8 of digital tube D6 is connected to the main control chip U3 through resistor R29; pin 9 of digital tube D6 is connected to the collector of transistor Q5; the emitter of transistor Q5 is grounded; the base of transistor Q5 is connected to the main control chip U3 and grounded through resistor R30; pin 10 of digital tube D6... The collector of transistor Q6 is connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, the base of transistor Q6 is connected to the main control chip U3 and grounded through resistor R31, the eleventh pin of digital tube D6 is connected to the collector of transistor Q7, the emitter of transistor Q7 is grounded, the base of transistor Q7 is connected to the main control chip U3 and grounded through resistor R32, the twelfth pin of digital tube D6 is connected to the collector of transistor Q8, the emitter of transistor Q8 is grounded, the base of transistor Q8 is connected to the main control chip U3 and grounded through resistor R33.

[0019] Further improvements to this technical solution include an alarm circuit comprising resistors R34 and R35, transistor Q9, and buzzer interface P5.

[0020] The first end of resistor R34 is connected to the main control chip U3. The second end of resistor R34 is connected to the first end of resistor R35 and the base of transistor Q9. The second end of resistor R35 and the emitter of transistor Q9 are both grounded. The collector of transistor Q9 is connected to the first pin of buzzer interface P5. The second pin of buzzer interface P1 is connected to the power supply.

[0021] Further improvements to this technical solution include a power supply circuit comprising a power interface P6, a capacitor C5, a fuse F1, a diode D7, a diode D8, a capacitor C6, a capacitor C7, a step-down chip U4, a capacitor C8, a capacitor C9, a ceramic chip capacitor U5, a diode D9, a diode D10, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a voltage regulator U6, a capacitor C15, and a capacitor C16.

[0022] The first pin of power interface P6 is grounded through capacitor C5, the second pin of power interface P6 is grounded, the third pin of power interface P6 is connected to the positive terminal of diode D7 through fuse F1, the negative terminal of diode D7 is connected to the positive terminal of diode D8, the negative terminal of diode D8 is connected to the 12V port, the first terminal of capacitor C6, the first terminal of capacitor C7, and the input pin of buck chip U4, the second terminal of capacitor C6, the second terminal of capacitor C7, and the ground pin of buck chip U4 are all grounded, the output pin of buck chip U4 is connected to the input terminal of ceramic chip capacitor U5, and is grounded through parallel capacitors C8 and C9, the output terminal of ceramic chip capacitor U5 is connected to the negative terminal of diode D9, the negative terminal of diode D10, the 5V power supply terminal, the first terminal of capacitor C10, and the first terminal of capacitor C11, the positive terminals of diode D9, diode D10, the second terminal of capacitor C10, and the second terminal of capacitor C11 are all grounded;

[0023] The input pin of regulator U6 is connected to the V power supply terminal and grounded through parallel capacitors C12, C13 and C14. The output pin of regulator U6 is connected to the VCC power supply terminal and grounded through parallel capacitors C15 and C16.

[0024] Further improvements to this technical solution include an active identification module and a 4G communication module, with the active identification module connected to the main control circuit via the 4G communication module.

[0025] The beneficial effects of this utility model are as follows:

[0026] By employing a designed pressure signal conditioning circuit, particularly integrating the JHM1203 signal conditioning and amplification chip U1, the chip effectively amplifies and finely processes the weak signal output by the pressure sensor, significantly improving signal quality. Through the configuration of components such as resistors, capacitors, amplifiers, and field-effect transistors in the circuit, the signal's anti-interference capability is enhanced, effectively resisting external noise interference and ensuring the accuracy of subsequent measurement and control.

[0027] The introduction of relay control circuits enables the main control circuit to directly drive high-power loads, such as motors and solenoid valves, without relying on the microcontroller inside the controlled equipment for secondary conversion, thus reducing system complexity. The addition of relay control circuits improves the efficiency and accuracy of control command execution, reduces control instability caused by microcontroller failure or communication delays, and enhances the overall stability and response speed of the system.

[0028] The display circuit design combines light-emitting diodes and digital tubes, enabling real-time and intuitive display of the operating status of the voltage control device and the controlled equipment.

[0029] The addition of an alarm circuit can promptly issue an alert when the system malfunctions or fails, reminding users to take appropriate measures and effectively avoiding potential safety hazards.

[0030] Furthermore, the design principle of this utility model is reliable, the structure is simple, and it has a very wide range of application prospects.

[0031] It is evident that this utility model has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0032] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic block diagram of the pressure control device.

[0034] Figure 2 This is a schematic diagram of a pressure signal conditioning circuit.

[0035] Figure 3 This is the schematic diagram of the main control circuit.

[0036] Figure 4 This is a schematic diagram of a relay control circuit.

[0037] Figure 5 This is the schematic diagram of the display circuit.

[0038] Figure 6 This is the schematic diagram of the alarm circuit.

[0039] Figure 7 This is the schematic diagram of the power supply circuit.

[0040] 110 is a pressure sensor, 120 is a pressure signal conditioning circuit, 130 is a main control circuit, 140 is a relay control circuit, 150 is a display circuit, 160 is a power supply circuit, 170 is an alarm circuit, 180 is an active identification module, and 190 is a 4G communication module. Detailed Implementation

[0041] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0043] like Figure 1 As shown, this utility model provides a pressure control device, including a pressure sensor, a pressure signal conditioning circuit, a main control circuit, a relay control circuit, a display circuit, and a power supply circuit for powering the entire device; the pressure sensor is connected to the input terminal of the pressure signal conditioning circuit, the output terminal of the pressure signal conditioning circuit is connected to the input terminal of the main control circuit through a 2IC bus, and the relay control circuit and the display circuit are both connected to the output terminal of the main control circuit.

[0044] like Figure 2As shown, the pressure signal conditioning circuit includes a signal conditioning amplifier chip U1, resistors R1, R2, and R3, amplifier U2, pressure sensor interface P1, resistor R4, transistor Q1, resistor R5, field-effect transistor Q2, capacitors C1 and C2, resistor R6, 2IC interface P1, resistor R7, and capacitor C3. The first pin of the signal conditioning amplifier chip U1 is connected to the first terminals of resistors R1 and R2. The second terminal of resistor R1 is connected to the first terminal of resistor R3 and the non-inverting input of amplifier U2. The second terminal of resistor R3 is grounded. The inverting input of amplifier U2 is connected to the first pin of pressure sensor interface P1 and the first terminal of resistor R4. The second terminal of resistor R4 is grounded. The output of amplifier U2 is connected to the second pin of pressure sensor interface P1. The second terminal of resistor R2 is connected to the base of transistor Q1. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to the first terminal of resistor R5 and the gate of MOSFET Q2. The second terminal of resistor R5 and the source of MOSFET Q2 are both connected to the power supply. The drain of MOSFET Q2 is connected to the power supply terminal of amplifier U2. The second pin of signal conditioning amplifier chip U1 is connected to the third pin of pressure sensing interface P1 and grounded through capacitor C1. The third pin of signal conditioning amplifier chip U1 is connected to the fourth pin of pressure sensing interface P1 and grounded through capacitor C2. The fourth pin of signal conditioning amplifier chip U1 is connected to the first pin of 2IC interface P2 and grounded through resistor R6. The fifth pin of signal conditioning amplifier chip U1 is connected to the second pin of 2IC interface P2 and grounded through resistor R7. The sixth pin of signal conditioning amplifier chip U1 is connected to the power supply and grounded through capacitor C3. The signal conditioning amplifier chip U1 is a JHM1203 model.

[0045] Specifically, the signal conditioning amplifier chip U1 is a JHM1203 model. This chip features high precision, low noise, and low power consumption, making it ideal for amplifying and conditioning pressure signals. The first pin of the signal conditioning amplifier chip U1 is connected to the common terminal of resistors R1 and R2 to receive the input signal and perform preliminary processing. Resistors R1 and R2 form a voltage divider circuit, dividing the input signal and sending it to the non-inverting input of amplifier U2. Resistor R3 serves as the feedback resistor for amplifier U2, used to set the amplification factor. Amplifier U2 further amplifies the weak signal output from the pressure sensor. Its non-inverting input is connected to the common terminal of resistors R1 and R3, and its inverting input is connected to the common terminal of pressure sensor interface P1 and resistor R4. The output of amplifier U2 is connected to the second pin of pressure sensor interface P1, providing the amplified signal. Resistor R4 serves as the inverting input resistor for amplifier U2, forming a feedback network with pressure sensor interface P1 to ensure the stability of the amplifier. Transistor Q1 and MOSFET Q2 form an automatic adjustment circuit to adjust the supply voltage of amplifier U2 according to the output signal, thereby achieving further fine processing of the signal. Resistor R5 serves as the load resistor for transistor Q1. The gate of MOSFET Q2 is connected to the collector of transistor Q1, and the drain is connected to the power supply terminal of amplifier U2. Capacitors C1 and C2 are connected to the second and third pins of signal conditioning amplifier chip U1, respectively, and grounded through ground, to filter out high-frequency noise and improve the signal's anti-interference capability. Resistors R6 and R7 are connected to the fourth and fifth pins of signal conditioning amplifier chip U1, respectively, and powered through the power supply, to set the chip's operating point. Capacitor C3 is connected to the sixth pin of signal conditioning amplifier chip U1 and ground to stabilize the chip's supply voltage.

[0046] This invention improves signal quality by employing the aforementioned pressure signal conditioning circuit. The JHM1203 signal conditioning amplifier chip features high precision and low noise, effectively amplifying and finely processing the weak signal output from the pressure sensor, significantly improving signal quality. The rational configuration of components such as resistors, capacitors, amplifiers, and field-effect transistors in the circuit enhances the signal's anti-interference capability, effectively resisting external noise interference and ensuring the accuracy of subsequent measurements and control. By adjusting the resistance value of resistor R3, the amplification factor of amplifier U2 can be easily changed, thus adapting to the output signal range of different pressure sensors. The automatic adjustment circuit composed of transistor Q1 and field-effect transistor Q2 can adjust its supply voltage according to the output signal of amplifier U2, ensuring the stability of the circuit under various operating conditions.

[0047] like Figure 3As shown, the main control circuit includes a main control chip U3, resistors R8 and R9, a 2IC interface P3, resistors R10, R11, R12, and R13. The first pin of the main control chip U3 is connected to the first end of resistor R9 and the first pin of the 2IC interface P3 via resistor R8. The second pin of the main control chip U3 is connected to the first end of resistor R11 and the second pin of the 2IC interface P3 via resistor R10. The third pin of the 2IC interface P3, the second end of resistor R9, and the second end of resistor R11 are all connected to the power supply. The third pin of the main control chip U3 is connected to the power supply via resistor R12 and grounded via capacitor C4. The fourth pin of the main control chip U3 is grounded via resistor R13. The main control chip U3 uses an STM32F103C8T6 microcontroller.

[0048] like Figure 4 As shown, the relay control circuit includes resistor R14, resistor R15, transistor Q3, diode D1, relay K1, and control interface P4. The first end of resistor R14 is connected to the main control chip U3, the second end of resistor R14 is connected to the first end of resistor R15 and the base of transistor Q3, the second end of resistor R15 and the emitter of transistor Q3 are both grounded, the collector of transistor Q3 is connected to the anode of diode D1 and the first end of the relay K1 coil, the cathode of diode D1 and the second end of the relay K1 coil are both connected to the power supply, the first end of the normally open switch of relay K1 is connected to the first pin of control interface P1, and the second end of the normally open switch of relay K1 is connected to the second pin of control interface P1.

[0049] Specifically, resistor R14 acts as a current-limiting resistor, with its first terminal connected to the control signal output pin of the main control chip U3. The main function of resistor R14 is to limit current and protect the main control chip from short circuits or overload damage. The second terminal of resistor R14 is connected to the first terminal of resistor R15 and the base of transistor Q3. Resistor R15 acts as a pull-down resistor, connected to ground, ensuring that transistor Q3 is in the off state when not receiving a control signal. Transistor Q3 is used as an electronic switch in this circuit. When the main control chip U3 outputs a high-level control signal, the base of transistor Q3 receives sufficient voltage through the voltage divider of resistors R14 and R15, causing it to conduct. The collector of transistor Q3 is connected to the anode of diode D1 and the first terminal of the relay K1 coil. When transistor Q3 conducts, the relay K1 coil receives power, generating a magnetic field that closes the normally open switch of relay K1. Diode D1 is used as a freewheeling diode in this circuit, with its cathode connected to the power supply and its anode connected to the first terminal of the relay K1 coil. When the coil of relay K1 is de-energized, a back electromotive force (EMF) is generated due to the rapid disappearance of the magnetic field in the coil. Diode D1 provides a discharge path, preventing this back EMF from damaging transistor Q3 or other circuit components. The normally open switch terminal of relay K1 is connected to the first pin of control interface P1, and the second terminal is connected to the second pin of control interface P1. When relay K1 is closed, a circuit is formed between these two pins, enabling control of external circuits or devices.

[0050] This invention enhances the circuit's anti-interference capability and stability by utilizing the current-limiting and pull-down effects of resistors R14 and R15, as well as the protective function of diode D1, ensuring accurate control of relay K1. Transistor Q3, used as an electronic switch, can quickly respond to the control signals of the main control chip U3, achieving precise control of relay K1. The current-limiting effect of resistor R14 protects the output pins of the main control chip U3, preventing damage due to excessive current. The design of the control interface P1 allows this relay control circuit to be easily connected to other circuits or devices, achieving a modular design that facilitates subsequent expansion and maintenance.

[0051] like Figure 5As shown, the display circuit includes resistor R16, LED D2, resistor R17, LED D3, resistor R18, LED D4, resistor R19, resistor R20, transistor Q4, resistor R21, diode D5, digital tube D6, resistors R22 to R29, transistor Q5, resistor R30, transistor Q6, resistor R31, transistor Q7, resistor R32, transistor Q8, and resistor R33. The positive terminal of LED D2 is connected to a 3.3V power supply, and the negative terminal of LED D2 is connected to the main control chip U3 through resistor R16. The positive terminal of LED D3 is connected to a 3.3V power supply. The negative terminal of diode D3 is connected to the main control chip U3 through resistor R17. The positive terminal of LED D4 is connected to the 3.3V power supply, and the negative terminal of LED D4 is connected to the main control chip U3 through resistor R18. The positive terminal of diode D5 is connected to the 3.3V power supply, and the negative terminal of diode D5 is connected to the collector of transistor Q4 through resistor R19. The emitter of transistor Q4 is grounded. The base of transistor Q4 is connected to the first terminals of resistors R20 and R21. The second terminal of resistor R20 is grounded, and the second terminal of resistor R21 is connected to the main control chip U3. The first pin of digital tube D6 is connected to the main control chip U3 through resistor R22. The second pin is connected to the main control chip U3 through resistor R23. The third pin of the digital tube D6 is connected to the main control chip U3 through resistor R24. The fourth pin of the digital tube D6 is connected to the main control chip U3 through resistor R25. The fifth pin of the digital tube D6 is connected to the main control chip U3 through resistor R26. The sixth pin of the digital tube D6 is connected to the main control chip U3 through resistor R27. The seventh pin of the digital tube D6 is connected to the main control chip U3 through resistor R28. The eighth pin of the digital tube D6 is connected to the main control chip U3 through resistor R29. The ninth pin of the digital tube D6 is connected to the collector of transistor Q5. The emitter of transistor Q5 is grounded. The base of transistor Q5 is connected to the main control chip U3 and grounded through resistor R30. The tenth pin of digital tube D6 is connected to the collector of transistor Q6. The emitter of transistor Q6 is grounded. The base of transistor Q6 is connected to the main control chip U3 and grounded through resistor R31. The eleventh pin of digital tube D6 is connected to the collector of transistor Q7. The emitter of transistor Q7 is grounded. The base of transistor Q7 is connected to the main control chip U3 and grounded through resistor R32. The twelfth pin of digital tube D6 is connected to the collector of transistor Q8. The emitter of transistor Q8 is grounded. The base of transistor Q8 is connected to the main control chip U3 and grounded through resistor R33.

[0052] Specifically, the anodes of LEDs D2, D3, and D4 are all connected to a 3.3V power supply, while their cathodes are connected to the GPIO (General-Purpose Input / Output Ports) pins of the main control chip U3 via resistors R16, R17, and R18, respectively. These resistors act as current-limiting resistors to protect the LEDs and the main control chip from damage caused by excessive current. When the corresponding GPIO pin of the main control chip U3 outputs a high level, the corresponding LED will light up. The anode of diode D5 is connected to a 3.3V power supply, and its cathode is connected to the collector of transistor Q4 via resistor R19. The emitter of transistor Q4 is grounded, and its base is connected to the main control chip U3 via resistors R20 and R21, where R20 acts as a pull-down resistor and R21 is used to transmit control signals. Pins 1 to 8 of the digital tube D6 are connected to the GPIO pins of the main control chip U3 via resistors R22 to R29, respectively, to control the on / off state of each segment of the digital tube, thereby displaying different numbers or characters. These resistors also act as current-limiting resistors, protecting the digital tube and the main control chip. Pins 9 to 12 of the digital tube D6 are connected to the collectors of transistors Q5, Q6, Q7, and Q8, respectively. The emitters of these transistors are all grounded, and their bases are connected to the main control chip U3 through resistors R30, R31, R32, and R33, and grounded through an additional resistor. This configuration allows the main control chip to switch the common anode or common cathode of the digital tube by controlling the conduction and cutoff of the transistors, thereby controlling the display of the entire digital tube.

[0053] This invention protects components such as LEDs, digital tubes, and transistors from damage caused by excessive current through the current-limiting effect of resistors, thereby enhancing the stability and reliability of the circuit. The main control chip U3 controls the LEDs and digital tubes by controlling the level states of the GPIO pins, ensuring the accuracy of the displayed content.

[0054] like Figure 6 As shown, the voltage control device also includes an alarm circuit comprising resistor R34, resistor R35, transistor Q9, and buzzer interface P5; the first end of resistor R34 is connected to the main control chip U3, the second end of resistor R34 is connected to the first end of resistor R35 and the base of transistor Q9, the second end of resistor R35 and the emitter of transistor Q9 are both grounded, the collector of transistor Q9 is connected to the first pin of buzzer interface P5, and the second pin of buzzer interface P5 is connected to the power supply.

[0055] Specifically, resistor R34 acts as a current-limiting resistor, with its first end connected to the alarm signal output pin (assuming it's a GPIO pin) of the main control chip U3. The main function of resistor R34 is to limit current and protect the main control chip from short circuits or overload damage. The second end of resistor R34 is connected to the first end of resistor R35 and the base of transistor Q9. Resistor R35 acts as a pull-down resistor, connected to ground, ensuring that transistor Q9 is in the off state when not receiving an alarm signal. Transistor Q9 functions as an electronic switch in this circuit. When the main control chip U3 outputs a high-level alarm signal, the base of transistor Q9 receives sufficient voltage through the voltage division of resistors R34 and R35, causing it to conduct. The collector of transistor Q9 is connected to the first pin of the buzzer interface P5. When transistor Q9 is on, the buzzer receives power, thus emitting an audible alarm. The second pin of the buzzer interface P5 is connected to the power supply, forming the power supply circuit for the buzzer together with the collector of transistor Q9. When transistor Q9 is turned on, a path is formed between the two pins of buzzer interface P5, and the buzzer starts to work.

[0056] This invention integrates an alarm circuit, enabling the voltage control device to promptly issue an audible alarm when an abnormality is detected, alerting operators to take appropriate measures and thus enhancing system safety. The main control chip U3 can quickly output an alarm signal, and through the rapid response of transistor Q9, the buzzer is activated instantly, improving the system's response speed to abnormal situations. The current-limiting function of resistors R34 and R35 not only protects the main control chip and transistor Q9 but also helps reduce circuit power consumption and extend the equipment's lifespan.

[0057] like Figure 7As shown, the power supply circuit includes a power interface P6, capacitor C5, fuse F1, diodes D7 and D8, capacitors C6 and C7, a step-down chip U4, capacitors C8 and C9, a ceramic chip capacitor U5, diodes D9 and D10, capacitors C10, C11, C12, C13, and C14, a voltage regulator U6, capacitors C15 and C16. The first pin of the power interface P6 is grounded through capacitor C5, the second pin of the power interface P6 is grounded, and the third pin of the power interface P6 is connected to the positive terminal of diode D7 through fuse F1. The negative terminal of diode D7 is connected to the positive terminal of diode D8, and the negative terminal of diode D8 is connected to the 12V port, the first terminal of capacitor C6, the first terminal of capacitor C7, and the input pin of the step-down chip U4. The second terminals of capacitor C6 and C7, and the ground pin of buck chip U4 are all grounded. The output pin of buck chip U4 is connected to the input terminal of ceramic chip capacitor U5 and grounded through parallel capacitors C8 and C9. The output terminal of ceramic chip capacitor U5 is connected to the negative terminals of diode D9 and D10, the 5V power supply terminal, the first terminal of capacitor C10, and the first terminal of capacitor C11. The positive terminals of diode D9 and D10, the second terminal of capacitor C10, and the second terminal of capacitor C11 are all grounded. The input pin of regulator U6 is connected to the V power supply terminal and grounded through parallel capacitors C12, C13, and C14. The output pin of regulator U6 is connected to the VCC power supply terminal and grounded through parallel capacitors C15 and C16.

[0058] The pressure control device also includes an active identification module and a 4G communication module. The active identification module is connected to the main control circuit via the 4G communication module. The active identification module is a module capable of generating and sending unique device identification information. This module typically includes components such as a memory, processor, and communication interface. In this embodiment, the active identification module is connected to the 4G communication module through its communication interface. When the pressure control device is activated or remote identification is required, the active identification module reads the device identification information stored therein and sends it to a remote server or control center via the 4G communication module.

[0059] The working principle of this pressure control device is as follows: a pressure sensor detects the pressure of the device under test and transmits the detected pressure signal to the pressure signal conditioning circuit for signal processing. The processed pressure signal is then transmitted to the main control circuit, which performs threshold judgment. At the same time, the main control circuit controls the display circuit to display the pressure value. When the received pressure signal exceeds the preset pressure threshold, the main control circuit sends a trigger signal to the relay control circuit and an alarm circuit to trigger a buzzer alarm.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure control device, characterized in that, It includes a pressure sensor, a pressure signal conditioning circuit, a main control circuit, a relay control circuit, a display circuit, and a power supply circuit that powers the entire device. The pressure sensor is connected to the input of the pressure signal conditioning circuit, and the output of the pressure signal conditioning circuit is connected to the input of the main control circuit via the 2IC bus. The relay control circuit and the display circuit are both connected to the output of the main control circuit. The pressure signal conditioning circuit includes a signal conditioning amplifier chip U1, resistors R1, R2, and R3, amplifier U2, pressure sensor interface P1, resistor R4, transistor Q1, resistor R5, field-effect transistor Q2, capacitor C1, capacitor C2, resistor R6, 2IC interface P1, resistor R7, and capacitor C3. The first pin of the signal conditioning amplifier chip U1 is connected to the first terminals of resistors R1 and R2. The second terminal of resistor R1 is connected to the first terminal of resistor R3 and the non-inverting input of amplifier U2. The second terminal of resistor R3 is grounded. The inverting input of amplifier U2 is connected to the first pin of pressure sensor interface P1 and the first terminal of resistor R4. The second terminal of resistor R4 is grounded. The output of amplifier U2 is connected to the second pin of pressure sensor interface P1. The second terminal of resistor R2 is connected to the base of transistor Q1. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to the first terminal of resistor R5 and the gate of field-effect transistor Q2. The second terminal of resistor R5 and the gate of field-effect transistor Q2 are connected to the... The sources of all transistors are connected to the power supply. The drain of the field-effect transistor Q2 is connected to the power supply terminal of the amplifier U2. The second pin of the signal conditioning amplifier chip U1 is connected to the third pin of the pressure sensing interface P1 and grounded through capacitor C1. The third pin of the signal conditioning amplifier chip U1 is connected to the fourth pin of the pressure sensing interface P1 and grounded through capacitor C2. The fourth pin of the signal conditioning amplifier chip U1 is connected to the first pin of the 2IC interface P2 and grounded through resistor R6. The fifth pin of the signal conditioning amplifier chip U1 is connected to the second pin of the 2IC interface P2 and grounded through resistor R7. The sixth pin of the signal conditioning amplifier chip U1 is connected to the power supply and grounded through capacitor C3.

2. The pressure control device according to claim 1, characterized in that, The signal conditioning and amplification chip U1 uses the JHM1203 signal conditioning and amplification chip.

3. The pressure control device according to claim 1, characterized in that, The main control circuit includes the main control chip U3, resistors R8 and R9, 2IC interface P3, resistors R10, R11, R12, and R13; The first pin of the main control chip U3 is connected to the first end of resistor R9 and the first pin of the 2IC interface P3 through resistor R8. The second pin of the main control chip U3 is connected to the first end of resistor R11 and the second pin of the 2IC interface P3 through resistor R10. The third pin of the 2IC interface P3, the second end of resistor R9, and the second end of resistor R11 are all connected to the power supply. The third pin of the main control chip U3 is connected to the power supply through resistor R12 and grounded through capacitor C4. The fourth pin of the main control chip U3 is grounded through resistor R13.

4. The pressure control device according to claim 3, characterized in that, The main control chip U3 uses a microcontroller with the model number STM32F103C8T6.

5. The pressure control device according to claim 3, characterized in that, The relay control circuit includes resistor R14, resistor R15, transistor Q3, diode D1, relay K1, and control interface P4; The first end of resistor R14 is connected to the main control chip U3. The second end of resistor R14 is connected to the first end of resistor R15 and the base of transistor Q3. The second end of resistor R15 and the emitter of transistor Q3 are both grounded. The collector of transistor Q3 is connected to the positive terminal of diode D1 and the first end of the coil of relay K1. The negative terminal of diode D1 and the second end of the coil of relay K1 are both connected to the power supply. The first end of the normally open switch of relay K1 is connected to the first pin of control interface P1. The second end of the normally open switch of relay K1 is connected to the second pin of control interface P1.

6. The pressure control device according to claim 3, characterized in that, The display circuit includes resistor R16, LED D2, resistor R17, LED D3, resistor R18, LED D4, resistor R19, resistor R20, transistor Q4, resistor R21, diode D5, digital tube D6, resistors R22 to R29, transistor Q5, resistor R30, transistor Q6, resistor R31, transistor Q7, resistor R32, transistor Q8, and resistor R33; The anode of LED D2 is connected to a 3.3V power supply, and the cathode of LED D2 is connected to the main control chip U3 through resistor R16. The anode of LED D3 is connected to a 3.3V power supply, and the cathode of LED D3 is connected to the main control chip U3 through resistor R17. The anode of LED D4 is connected to a 3.3V power supply, and the cathode of LED D4 is connected to the main control chip U3 through resistor R18. The anode of diode D5 is connected to a 3.3V power supply, and the cathode of diode D5 is connected to transistor Q4 through resistor R19. The collector of transistor Q4 is grounded, the emitter of transistor Q4 is grounded, the base of transistor Q4 is connected to the first terminals of resistor R20 and resistor R21, the second terminal of resistor R20 is grounded, the second terminal of resistor R21 is connected to the main control chip U3, the first pin of digital tube D6 is connected to the main control chip U3 through resistor R22, the second pin of digital tube D6 is connected to the main control chip U3 through resistor R23, the third pin of digital tube D6 is connected to the main control chip U3 through resistor R24, and the fourth pin of digital tube D6 is connected to the main control chip U3 through resistor R25.

3. Pin 5 of digital tube D6 is connected to the main control chip U3 through resistor R26; pin 6 of digital tube D6 is connected to the main control chip U3 through resistor R27; pin 7 of digital tube D6 is connected to the main control chip U3 through resistor R28; pin 8 of digital tube D6 is connected to the main control chip U3 through resistor R29; pin 9 of digital tube D6 is connected to the collector of transistor Q5; the emitter of transistor Q5 is grounded; the base of transistor Q5 is connected to the main control chip U3 and grounded through resistor R30; pin 10 of digital tube D6... The collector of transistor Q6 is connected to the collector of transistor Q6, the emitter of transistor Q6 is grounded, the base of transistor Q6 is connected to the main control chip U3 and grounded through resistor R31, the eleventh pin of digital tube D6 is connected to the collector of transistor Q7, the emitter of transistor Q7 is grounded, the base of transistor Q7 is connected to the main control chip U3 and grounded through resistor R32, the twelfth pin of digital tube D6 is connected to the collector of transistor Q8, the emitter of transistor Q8 is grounded, the base of transistor Q8 is connected to the main control chip U3 and grounded through resistor R33.

7. The pressure control device according to claim 3, characterized in that, It also includes an alarm circuit consisting of resistor R34, resistor R35, transistor Q9, and buzzer interface P5; The first end of resistor R34 is connected to the main control chip U3. The second end of resistor R34 is connected to the first end of resistor R35 and the base of transistor Q9. The second end of resistor R35 and the emitter of transistor Q9 are both grounded. The collector of transistor Q9 is connected to the first pin of buzzer interface P5. The second pin of buzzer interface P1 is connected to the power supply.

8. The pressure control device according to claim 1, characterized in that, The power supply circuit includes power interface P6, capacitor C5, fuse F1, diode D7, diode D8, capacitor C6, capacitor C7, step-down chip U4, capacitor C8, capacitor C9, ceramic chip capacitor U5, diode D9, diode D10, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, voltage regulator U6, capacitor C15, and capacitor C16; The first pin of power interface P6 is grounded through capacitor C5, the second pin of power interface P6 is grounded, the third pin of power interface P6 is connected to the positive terminal of diode D7 through fuse F1, the negative terminal of diode D7 is connected to the positive terminal of diode D8, the negative terminal of diode D8 is connected to the 12V port, the first terminal of capacitor C6, the first terminal of capacitor C7, and the input pin of buck chip U4, the second terminal of capacitor C6, the second terminal of capacitor C7, and the ground pin of buck chip U4 are all grounded, the output pin of buck chip U4 is connected to the input terminal of ceramic chip capacitor U5, and is grounded through parallel capacitors C8 and C9, the output terminal of ceramic chip capacitor U5 is connected to the negative terminal of diode D9, the negative terminal of diode D10, the 5V power supply terminal, the first terminal of capacitor C10, and the first terminal of capacitor C11, the positive terminals of diode D9, diode D10, the second terminal of capacitor C10, and the second terminal of capacitor C11 are all grounded; The input pin of regulator U6 is connected to the V power supply terminal and grounded through parallel capacitors C12, C13 and C14. The output pin of regulator U6 is connected to the VCC power supply terminal and grounded through parallel capacitors C15 and C16.

9. The pressure control device according to claim 1, characterized in that, It also includes an active identification module and a 4G communication module, with the active identification module connected to the main control circuit via the 4G communication module.

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