Remote transmission on-line pressure gauge based on star flash

Abstract

The utility model relates to the technical field of pressure gauges, in particular to a remote transmission online pressure gauge based on star flash. A pressure transmitter based on a cellular wireless network is replaced, real-time monitoring and acquisition of pressure data are realized, and production efficiency and safety are improved. Compared with a traditional scheme, the power consumption is lower, the speed is higher, the time delay is lower, and the connection is more stable. Due to higher reliability, the pressure transmitter not only can replace a pressure transmitter based on a cellular wireless network, but also can replace a wired pressure transmitter based on 4-20mA transmitting current. Along with continuous progress of science and technology and continuous expansion of the application field, the application prospect of the technology is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure gauges, in particular to a remote transmission online pressure gauge based on star flash. Background Art

[0002] With the continuous development of industrial automation, the demand for monitoring and data collection of field equipment is also increasing. In the fields of petroleum, chemical, electric power, metallurgy, etc., online pressure gauges, as an important sensor device, are widely used in various process flows. However, traditional pressure gauges based on cellular wireless networks (including 4G, 5G, etc.) have some problems in reliability. First, they rely on the quality of local base station signals. If the on-site signal is poor or there is no signal, the pressure gauge will not work. Secondly, these pressure gauges also have inherent problems such as high power consumption, short battery life, poor anti-interference performance, and long signal delay time. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a remote transmission online pressure gauge based on star flash.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A remote online pressure gauge based on Star Flash, including a relay receiver and several terminal collectors, the relay receiver and the terminal collectors are connected by Star Flash wireless communication, the terminal collectors include an AD sampling circuit, an isolation circuit, a main control circuit and a wireless communication circuit; the AD sampling circuit is electrically connected to the main control circuit through the isolation circuit, and the main control circuit establishes a communication connection with the relay receiver through the wireless communication circuit.

[0006] Furthermore, the wireless communication circuit includes a module U2, and the module U2 includes a chip U2A. The model of the chip U2A is EB25, and the seventeenth pin and the eighteenth pin of the chip U2A are electrically connected to the main control circuit respectively.

[0007] Furthermore, it also includes an oscillation circuit, a filtering protection circuit, a level conversion circuit and a voltage dividing circuit;

[0008] The oscillation circuit is electrically connected to the third pin and the fourth pin of the chip U2A;

[0009] One end of the filter protection circuit is electrically connected to the power supply end, and the other end of the filter protection circuit is electrically connected to the tenth pin of the chip U2A;

[0010] The level conversion circuit is electrically connected to the first pin and the twelfth pin of the chip U2A respectively;

[0011] One end of the voltage divider circuit is electrically connected to the power supply end, and the other end of the voltage divider circuit is electrically connected to the seventh pin of the chip U2A.

[0012] Furthermore, the AD sampling circuit includes a chip U4, a differential voltage filter circuit and a temperature measurement unit; the model of the chip U4 is AD7724;

[0013] The differential voltage output by the external pressure sensor is electrically connected to the ninth pin and the tenth pin of the chip U4 through the differential voltage filter circuit;

[0014] The temperature measurement unit is electrically connected to the eighth pin of the chip U4;

[0015] The first pin, the second pin, the fourth pin and the twenty-fourth pin of the chip U4 are electrically connected to the isolation circuit respectively.

[0016] Furthermore, it also includes an interface J3, and the differential voltage filter circuit includes a resistor R22, a resistor R23, a resistor R24, a capacitor C32, a capacitor C33 and a capacitor C34; the fourth pin of the interface J3 is electrically connected to the tenth pin of the chip U4 through the resistor R22, the second pin of the interface J3 is electrically connected to the ninth pin of the chip U4 through the resistor R24, the third pin of the interface J3 is electrically connected to one end of the resistor R23, the other end of the resistor R23 is respectively electrically connected to one end of the capacitor C32 and one end of the capacitor C34, the other end of the capacitor C32 is electrically connected to the tenth pin of the chip U4, the other end of the capacitor C34 is electrically connected to the ninth pin of the chip U4, and the two ends of the capacitor C33 are respectively electrically connected to the ninth pin and the tenth pin of the chip U4.

[0017] Furthermore, the temperature measurement unit includes a diode D3, a resistor R9, a resistor R25 and a capacitor C38; the first pin of the interface J3 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is electrically connected to the positive electrode of the diode D3, one end of the resistor R25, one end of the capacitor C38 and the eighth pin of the chip U4, respectively, the negative electrode of the diode D3 and the other end of the capacitor C38 are both grounded; the other end of the resistor R25 is connected to the power supply VCC.

[0018] Further, it also includes capacitor C37, capacitor C46 and capacitor C48;

[0019] One end of the capacitor C37 is electrically connected to the 20th pin of the chip U4, one end of the capacitor C46 is electrically connected to the 18th pin of the chip U4, one end of the capacitor C48 is electrically connected to the 16th pin of the chip U4, and the 16th pin of the chip U4 is connected to the power supply VCC;

[0020] The other end of the capacitor C37, the other end of the capacitor C46, ​​the other end of the capacitor C48, the seventeenth pin and the nineteenth pin of the chip U4 are all grounded.

[0021] Furthermore, it also includes a capacitor C35, a capacitor C36 and a resistor R16;

[0022] The twenty-second pin of the chip U4 is electrically connected to one end of the capacitor C35, one end of the capacitor C36, one end of the resistor R16 and the power supply VCC respectively, the other end of the capacitor C35 and the other end of the capacitor C36 are both grounded, and the other end of the resistor R16 is electrically connected to the twenty-fourth pin of the chip U4.

[0023] Furthermore, the isolation circuit includes a chip U5, a chip U7, a MOS tube Q1, a transformer T1, a rectifier circuit and a capacitor C25;

[0024] The gate of the MOS tube Q1 is electrically connected to the PWM signal output end of the main control circuit, the collector of the MOS tube Q1 is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the third pin and the fourth pin of the chip U7 through the rectifier circuit, the two ends of the capacitor C25 are electrically connected to the sixth pin and the first pin of the chip U7 respectively, and the sixth pin of the chip U7 is electrically connected to the sixteenth pin of the chip U5.

[0025] Further, the isolation circuit also includes capacitor C15, capacitor C1 and capacitor C6;

[0026] The two ends of the capacitor C15 are electrically connected to the fifteenth pin and the sixteenth pin of the chip U5 respectively, the two ends of the capacitor C1 are electrically connected to the tenth pin and the seventh pin of the chip U5 respectively, and the two ends of the capacitor C6 are electrically connected to the first pin and the second pin of the chip U5 respectively.

[0027] The beneficial effects of the utility model are:

[0028] The utility model provides a remote online pressure gauge based on Star Flash, which replaces the pressure transmitter based on the cellular wireless network, realizes real-time monitoring and collection of pressure data, and improves production efficiency and safety. Compared with traditional solutions, it has lower power consumption, faster speed, lower latency, and more stable connection. Due to its higher reliability, it can not only replace the pressure transmitter based on the cellular wireless network, but also replace the wired pressure transmitter based on 4-20mA transmission current. With the continuous advancement of science and technology and the continuous expansion of application fields, the application prospects of this technology will be broader. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a module schematic diagram of a remote online pressure gauge based on Star Flash of the utility model;

[0030] Figure 2 This is a circuit connection diagram of a main control circuit of a remote online pressure gauge based on Star Flash in the utility model;

[0031] Figure 3 This is a circuit connection diagram of an AD sampling circuit of a remote online pressure gauge based on Star Flash in the utility model;

[0032] Figure 4 It is a circuit connection diagram of a wireless communication circuit of a remote online pressure gauge based on Star Flash in the utility model;

[0033] Figure 5 It is a circuit connection diagram of an isolation circuit of a remote online pressure gauge based on Star Flash in the utility model;

[0034] Description of labels:

[0035] 101. AD sampling circuit; 102. isolation circuit; 103. wireless communication circuit; 104. main control circuit. DETAILED DESCRIPTION

[0036] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0037] Please refer to Figure 1 The utility model provides a remote online pressure gauge based on Star Flash, which includes a relay receiver and several terminal collectors. The relay receiver and the terminal collector are connected by Star Flash wireless communication. The terminal collector includes an AD sampling circuit 101, an isolation circuit 102, a main control circuit 104 and a wireless communication circuit 103; the AD sampling circuit 101 is electrically connected to the main control circuit 104 through the isolation circuit 102, and the main control circuit 104 establishes a communication connection with the relay receiver through the wireless communication circuit 103.

[0038] From the above description, it can be seen that the beneficial effects of the utility model are:

[0039] The utility model provides a remote online pressure gauge based on Star Flash, which replaces the pressure transmitter based on the cellular wireless network, realizes real-time monitoring and collection of pressure data, and improves production efficiency and safety. Compared with traditional solutions, it has lower power consumption, faster speed, lower latency, and more stable connection. Due to its higher reliability, it can not only replace the pressure transmitter based on the cellular wireless network, but also replace the wired pressure transmitter based on 4-20mA transmission current. With the continuous advancement of science and technology and the continuous expansion of application fields, the application prospects of this technology will be broader.

[0040] Furthermore, the wireless communication circuit includes a module U2, and the module U2 includes a chip U2A. The model of the chip U2A is EB25, and the seventeenth pin and the eighteenth pin of the chip U2A are electrically connected to the main control circuit respectively.

[0041] It can be seen from the above description that the wireless communication circuit is electrically connected to the main control circuit through the above method.

[0042] Furthermore, it also includes an oscillation circuit, a filtering protection circuit, a level conversion circuit and a voltage dividing circuit;

[0043] The oscillation circuit is electrically connected to the third pin and the fourth pin of the chip U2A;

[0044] One end of the filter protection circuit is electrically connected to the power supply end, and the other end of the filter protection circuit is electrically connected to the tenth pin of the chip U2A;

[0045] The level conversion circuit is electrically connected to the first pin and the twelfth pin of the chip U2A respectively;

[0046] One end of the voltage divider circuit is electrically connected to the power supply end, and the other end of the voltage divider circuit is electrically connected to the seventh pin of the chip U2A.

[0047] From the above description, it can be seen that the peripheral circuit design of the chip U2A is realized through the above method.

[0048] Furthermore, the AD sampling circuit includes a chip U4, a differential voltage filter circuit and a temperature measurement unit; the model of the chip U4 is AD7724;

[0049] The differential voltage output by the external pressure sensor is electrically connected to the ninth pin and the tenth pin of the chip U4 through the differential voltage filter circuit;

[0050] The temperature measurement unit is electrically connected to the eighth pin of the chip U4;

[0051] The first pin, the second pin, the fourth pin and the twenty-fourth pin of the chip U4 are electrically connected to the isolation circuit respectively.

[0052] It can be seen from the above description that the temperature measurement of the AD sampling circuit is achieved through the above method.

[0053] Furthermore, it also includes an interface J3, and the differential voltage filter circuit includes a resistor R22, a resistor R23, a resistor R24, a capacitor C32, a capacitor C33 and a capacitor C34; the fourth pin of the interface J3 is electrically connected to the tenth pin of the chip U4 through the resistor R22, the second pin of the interface J3 is electrically connected to the ninth pin of the chip U4 through the resistor R24, the third pin of the interface J3 is electrically connected to one end of the resistor R23, the other end of the resistor R23 is respectively electrically connected to one end of the capacitor C32 and one end of the capacitor C34, the other end of the capacitor C32 is electrically connected to the tenth pin of the chip U4, the other end of the capacitor C34 is electrically connected to the ninth pin of the chip U4, and the two ends of the capacitor C33 are respectively electrically connected to the ninth pin and the tenth pin of the chip U4.

[0054] It can be seen from the above description that, in the above manner, the differential voltage output by the pressure sensor is connected to the ninth pin and the tenth pin of the chip U4 through the filtering circuit.

[0055] Furthermore, the temperature measurement unit includes a diode D3, a resistor R9, a resistor R25 and a capacitor C38; the first pin of the interface J3 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is electrically connected to the positive electrode of the diode D3, one end of the resistor R25, one end of the capacitor C38 and the eighth pin of the chip U4, respectively, the negative electrode of the diode D3 and the other end of the capacitor C38 are both grounded; the other end of the resistor R25 is connected to the power supply VCC.

[0056] It can be seen from the above description that, through the above method, the temperature measurement unit utilizes the PN junction temperature drift characteristic of the diode D3, and the eighth pin of the chip U4 calculates the current temperature by sampling the junction voltage of the PN junction.

[0057] Further, it also includes capacitor C37, capacitor C46 and capacitor C48;

[0058] One end of the capacitor C37 is electrically connected to the 20th pin of the chip U4, one end of the capacitor C46 is electrically connected to the 18th pin of the chip U4, one end of the capacitor C48 is electrically connected to the 16th pin of the chip U4, and the 16th pin of the chip U4 is connected to the power supply VCC;

[0059] The other end of the capacitor C37, the other end of the capacitor C46, ​​the other end of the capacitor C48, the seventeenth pin and the nineteenth pin of the chip U4 are all grounded.

[0060] Furthermore, it also includes a capacitor C35, a capacitor C36 and a resistor R16;

[0061] The twenty-second pin of the chip U4 is electrically connected to one end of the capacitor C35, one end of the capacitor C36, one end of the resistor R16 and the power supply VCC respectively, the other end of the capacitor C35 and the other end of the capacitor C36 are both grounded, and the other end of the resistor R16 is electrically connected to the twenty-fourth pin of the chip U4.

[0062] Furthermore, the isolation circuit includes a chip U5, a chip U7, a MOS tube Q1, a transformer T1, a rectifier circuit and a capacitor C25;

[0063] The gate of the MOS tube Q1 is electrically connected to the PWM signal output end of the main control circuit, the collector of the MOS tube Q1 is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the third pin and the fourth pin of the chip U7 through the rectifier circuit, the two ends of the capacitor C25 are electrically connected to the sixth pin and the first pin of the chip U7 respectively, and the sixth pin of the chip U7 is electrically connected to the sixteenth pin of the chip U5.

[0064] It can be seen from the above description that the electrical isolation effect is achieved through the above method.

[0065] Further, the isolation circuit also includes capacitor C15, capacitor C1 and capacitor C6;

[0066] The two ends of the capacitor C15 are electrically connected to the fifteenth pin and the sixteenth pin of the chip U5 respectively, the two ends of the capacitor C1 are electrically connected to the tenth pin and the seventh pin of the chip U5 respectively, and the two ends of the capacitor C6 are electrically connected to the first pin and the second pin of the chip U5 respectively.

[0067] Please refer to Figures 1 to 5 , Embodiment 1 of the present utility model is:

[0068] The utility model provides a remote online pressure gauge based on Star Flash, which includes a relay receiver and several terminal collectors. The relay receiver and the terminal collectors are connected by Star Flash wireless communication. The terminal collector includes an AD sampling circuit 101, an isolation circuit 102, a main control circuit 104 and a wireless communication circuit 103; the AD sampling circuit is electrically connected to the main control circuit through the isolation circuit, and the main control circuit establishes a communication connection with the relay receiver through the wireless communication circuit.

[0069] Specifically, the relay receiver and the terminal collector are connected using the Star Flash 1.0 wireless communication protocol. In order to reduce power consumption, the terminal collector is in sleep mode most of the time. On-demand communication is adopted between the relay receiver and the terminal collector. When the terminal collector needs the pressure value of a certain point, the relay receiver sends a trigger signal to the corresponding terminal collector. This trigger signal contains the machine number of the terminal collector to be awakened, the required working time, and the number of pressure values ​​to be collected. The corresponding terminal collector exits the sleep state and adds a timestamp according to the working time required by the terminal collector and the number of pressure values ​​to be collected to form a data packet and send it to the relay receiver. When the confirmation signal from the relay receiver is received, the terminal collector immediately enters the sleep state to reduce power consumption and wait for the next trigger wake-up.

[0070] According to the response speed requirements from the relay receiver to the terminal collector, the distance between the relay receiver and the terminal collector, and the battery life requirements of the terminal collector, the relay receiver can configure the working mode of the collection terminal. When the relay receiver requires the terminal collector to quickly return the pressure value or the distance between the relay receiver and the terminal collector is far, the terminal collector can be configured to work in SLB mode. When the relay receiver does not have high requirements for the delay of the return pressure of the terminal collector and requires the terminal collector to work with long battery life, the terminal collector can be made to work in SLE mode. In short, the relay receiver and the terminal collector are an organic whole. The relay receiver is not only a data receiving device, but also has powerful management capabilities. Through the different configurations of the relay receiver for the terminal collector and the ability to trigger the required equipment on demand, the pressure collection system can meet the requirements of low power consumption, low latency, and high rate. Because the Star Flash technology uses the Polar code encoding scheme, the communication between the relay receiver and the terminal collector has a strong anti-interference ability and can run stably in industrial and mining enterprises with relatively harsh electromagnetic environments.

[0071] In this embodiment, if Figure 2 As shown, the main control circuit 104 includes a chip U3, a resistor R50, a capacitor C28, a capacitor C9 and a capacitor C39, and the model of the chip U3 is STM32G030C8Tx, wherein the resistor R50 and the capacitor C28 are connected to form a reset circuit connected to the tenth pin of the chip U3 for power-on reset of the chip U3, and the capacitors C9 and C39 are used for filtering the input power of the chip U3. The main control circuit 104 receives the pressure value of the AD sampling circuit 102 and the pressure correction value of the wireless radio frequency circuit 103 through the SPI port to calculate the liquid level, and then outputs the liquid level value through the current transducer circuit, and at the same time, the HART communication circuit outputs the liquid level value to the host computer.

[0072] In this embodiment, if Figure 4As shown, the wireless communication circuit 103 includes a module U2, and the module U2 includes a chip U2A. The model of the chip U2A is EB25, and the seventeenth pin and the eighteenth pin of the chip U2A are electrically connected to the main control circuit respectively.

[0073] The wireless communication circuit also includes an oscillation circuit, a filter protection circuit, a level conversion circuit and a voltage divider circuit;

[0074] The oscillation circuit is electrically connected to the third pin and the fourth pin of the chip U2A;

[0075] One end of the filter protection circuit is electrically connected to the power supply end, and the other end of the filter protection circuit is electrically connected to the tenth pin of the chip U2A;

[0076] The level conversion circuit is electrically connected to the first pin and the twelfth pin of the chip U2A respectively;

[0077] One end of the voltage divider circuit is electrically connected to the power supply end, and the other end of the voltage divider circuit is electrically connected to the seventh pin of the chip U2A.

[0078] The oscillator circuit is composed of capacitor C6, capacitor C7 and crystal oscillator X1, which provides an accurate clock for the circuit second signal. The specific connection method is as follows: Figure 4 The filter protection circuit is composed of diode D2, capacitor C8 and capacitor C13. The specific connection method is as follows: Figure 4 shown.

[0079] Resistor R10 and resistor D5 form a level conversion circuit for 1.8V and 3.3V voltage conversion. Resistor R8, resistor R13, and capacitor C12 form a level conversion circuit for 1.8V and 3.3V voltage conversion. Resistor R7 and diode D4 form a level conversion circuit for 1.8V and 3.3V level conversion. The specific connection method is as follows: Figure 4 shown.

[0080] Resistors R2, R3 and R4 form a voltage divider circuit for feeding back the output voltage of the power chip U1 to the power chip U1. The seventeenth and eighteenth pins of the chip U2A are the TX and RX pins of the serial port, which are connected to the thirty-second and twenty-ninth pins of the main control circuit to form a serial communication circuit.

[0081] Resistors R11 and R12 form a voltage divider circuit to transfer the input voltage to chip U2A for undervoltage protection. The specific connection method is as follows: Figure 4 shown.

[0082] In this embodiment, if Figure 3As shown, the AD sampling circuit 101 includes a chip U4, a differential voltage filter circuit and a temperature measurement unit; the model of the chip U4 is AD7724;

[0083] The differential voltage output by the external pressure sensor is electrically connected to the ninth pin and the tenth pin of the chip U4 through the differential voltage filter circuit;

[0084] The temperature measurement unit is electrically connected to the eighth pin of the chip U4;

[0085] The first pin, the second pin, the fourth pin and the twenty-fourth pin of the chip U4 are electrically connected to the isolation circuit respectively.

[0086] The AD sampling circuit also includes an interface J3, and the differential voltage filter circuit includes a resistor R22, a resistor R23, a resistor R24, a capacitor C32, a capacitor C33 and a capacitor C34; the fourth pin of the interface J3 is electrically connected to the tenth pin of the chip U4 through the resistor R22, the second pin of the interface J3 is electrically connected to the ninth pin of the chip U4 through the resistor R24, the third pin of the interface J3 is electrically connected to one end of the resistor R23, the other end of the resistor R23 is respectively electrically connected to one end of the capacitor C32 and one end of the capacitor C34, the other end of the capacitor C32 is electrically connected to the tenth pin of the chip U4, the other end of the capacitor C34 is electrically connected to the ninth pin of the chip U4, and the two ends of the capacitor C33 are respectively electrically connected to the ninth pin and the tenth pin of the chip U4.

[0087] The temperature measurement unit includes a diode D3, a resistor R9, a resistor R25 and a capacitor C38; the first pin of the interface J3 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is electrically connected to the positive electrode of the diode D3, one end of the resistor R25, one end of the capacitor C38 and the eighth pin of the chip U4 respectively, the negative electrode of the diode D3 and the other end of the capacitor C38 are both grounded; the other end of the resistor R25 is connected to the power supply VCC.

[0088] Resistor R22, resistor R23, resistor R24, capacitor C32, capacitor C33 and capacitor C34 are connected to form a differential voltage filter circuit. The differential voltage output by the pressure sensor is connected to the ninth pin and the tenth pin of the chip U4 through the differential voltage filter circuit. Resistor R25, diode D3 and capacitor C38 form a temperature measurement unit. This temperature measurement unit utilizes the PN junction temperature drift characteristics of diode D3. The eighth pin of chip U4 calculates the current temperature by sampling the junction voltage of the PN junction. The first pin, the second pin, the fourth pin and the twenty-fourth pin of chip U4 are the SPI interface of chip U4.

[0089] The AD sampling circuit also includes a capacitor C37, a capacitor C46 and a capacitor C48;

[0090] One end of the capacitor C37 is electrically connected to the 20th pin of the chip U4, one end of the capacitor C46 is electrically connected to the 18th pin of the chip U4, one end of the capacitor C48 is electrically connected to the 16th pin of the chip U4, and the 16th pin of the chip U4 is connected to the power supply VCC;

[0091] The other end of the capacitor C37, the other end of the capacitor C46, ​​the other end of the capacitor C48, the seventeenth pin and the nineteenth pin of the chip U4 are all grounded.

[0092] The AD sampling circuit also includes a capacitor C35, a capacitor C36 and a resistor R16;

[0093] The twenty-second pin of the chip U4 is electrically connected to one end of the capacitor C35, one end of the capacitor C36, one end of the resistor R16 and the power supply VCC respectively, the other end of the capacitor C35 and the other end of the capacitor C36 are both grounded, and the other end of the resistor R16 is electrically connected to the twenty-fourth pin of the chip U4.

[0094] The isolation circuit 102 includes a chip U5, a chip U7, a MOS tube Q1, a transformer T1, a rectifier circuit, a capacitor C25, a capacitor C15, a capacitor C1 and a capacitor C6; the model of the chip U7 is MAX6103, and the model of the chip U5 is ADUM1441ARQZ.

[0095] The gate of the MOS tube Q1 is electrically connected to the PWM signal output terminal of the main control circuit, the collector of the MOS tube Q1 is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the third pin and the fourth pin of the chip U7 through the rectifier circuit, the two ends of the capacitor C25 are electrically connected to the sixth pin and the first pin of the chip U7 respectively, and the sixth pin of the chip U7 is electrically connected to the sixteenth pin of the chip U5. Among them, the rectifier circuit is composed of a diode D6 and a capacitor C13 and a capacitor C40, and the specific connection method is as follows: Figure 5 shown.

[0096] The two ends of the capacitor C15 are electrically connected to the fifteenth pin and the sixteenth pin of the chip U5 respectively, the two ends of the capacitor C1 are electrically connected to the tenth pin and the seventh pin of the chip U5 respectively, and the two ends of the capacitor C6 are electrically connected to the first pin and the second pin of the chip U5 respectively.

[0097] The gate of MOS tube Q1 receives the PWM signal from the microcontroller, controls the on and off of transformer T1, and the current is transferred from the primary of T1 to the secondary. The secondary oscillating current forms a secondary power supply through the rectifier circuit composed of diode D6, capacitor C13 and capacitor C40. The secondary power supply forms a stable 3 volt voltage after passing through chip U7 and C25. Chip U5, capacitor C6 and capacitor C15 form an SPI signal isolation circuit. After the power supply and signal are isolated, the AD sampling circuit is electrically isolated from the microcontroller.

[0098] In summary, the utility model provides a remote online pressure gauge based on Star Flash, which replaces the pressure transmitter based on cellular wireless network, realizes real-time monitoring and collection of pressure data, and improves production efficiency and safety. Compared with traditional solutions, it has lower power consumption, faster speed, lower latency, and more stable connection. Due to its higher reliability, it can not only replace the pressure transmitter based on cellular wireless network, but also replace the wired pressure transmitter based on 4-20mA transmission current. With the continuous advancement of science and technology and the continuous expansion of application fields, the application prospects of this technology will be broader.

[0099] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A remote online pressure gauge based on star flash, characterized in that: It includes a relay receiver and several terminal collectors, the relay receiver and the terminal collectors are connected by star flash wireless communication, and the terminal collectors include AD sampling circuit, isolation circuit, main control circuit and wireless communication circuit; the AD sampling circuit is electrically connected to the main control circuit through the isolation circuit, and the main control circuit establishes a communication connection with the relay receiver through the wireless communication circuit.

2. A remote online pressure gauge based on star flash according to claim 1, characterized in that: The wireless communication circuit includes a module U2, and the module U2 includes a chip U2A. The model of the chip U2A is EB25. The seventeenth pin and the eighteenth pin of the chip U2A are electrically connected to the main control circuit respectively.

3. A remote online pressure gauge based on star flash according to claim 2, characterized in that: It also includes an oscillation circuit, a filtering protection circuit, a level conversion circuit and a voltage divider circuit; The oscillation circuit is electrically connected to the third pin and the fourth pin of the chip U2A; One end of the filter protection circuit is electrically connected to the power supply end, and the other end of the filter protection circuit is electrically connected to the tenth pin of the chip U2A; The level conversion circuit is electrically connected to the first pin and the twelfth pin of the chip U2A respectively; One end of the voltage divider circuit is electrically connected to the power supply end, and the other end of the voltage divider circuit is electrically connected to the seventh pin of the chip U2A.

4. A remote online pressure gauge based on star flash according to claim 2, characterized in that: The AD sampling circuit includes a chip U4, a differential voltage filter circuit and a temperature measurement unit; the model of the chip U4 is AD7724; The differential voltage output by the external pressure sensor is electrically connected to the ninth pin and the tenth pin of the chip U4 through the differential voltage filter circuit; The temperature measurement unit is electrically connected to the eighth pin of the chip U4; The first pin, the second pin, the fourth pin and the twenty-fourth pin of the chip U4 are electrically connected to the isolation circuit respectively.

5. The remote online pressure gauge based on star flash according to claim 4 is characterized in that: It also includes an interface J3, and the differential voltage filter circuit includes a resistor R22, a resistor R23, a resistor R24, a capacitor C32, a capacitor C33 and a capacitor C34; the fourth pin of the interface J3 is electrically connected to the tenth pin of the chip U4 through the resistor R22, the second pin of the interface J3 is electrically connected to the ninth pin of the chip U4 through the resistor R24, the third pin of the interface J3 is electrically connected to one end of the resistor R23, the other end of the resistor R23 is respectively electrically connected to one end of the capacitor C32 and one end of the capacitor C34, the other end of the capacitor C32 is electrically connected to the tenth pin of the chip U4, the other end of the capacitor C34 is electrically connected to the ninth pin of the chip U4, and the two ends of the capacitor C33 are respectively electrically connected to the ninth pin and the tenth pin of the chip U4.

6. A remote online pressure gauge based on star flash according to claim 5, characterized in that: The temperature measurement unit includes a diode D3, a resistor R9, a resistor R25 and a capacitor C38; the first pin of the interface J3 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is electrically connected to the positive electrode of the diode D3, one end of the resistor R25, one end of the capacitor C38 and the eighth pin of the chip U4 respectively, the negative electrode of the diode D3 and the other end of the capacitor C38 are both grounded; the other end of the resistor R25 is connected to the power supply VCC.

7. The remote online pressure gauge based on star flash according to claim 5 is characterized in that: Also includes capacitor C37, capacitor C46 and capacitor C48; One end of the capacitor C37 is electrically connected to the 20th pin of the chip U4, one end of the capacitor C46 is electrically connected to the 18th pin of the chip U4, one end of the capacitor C48 is electrically connected to the 16th pin of the chip U4, and the 16th pin of the chip U4 is connected to the power supply VCC; The other end of the capacitor C37, the other end of the capacitor C46, ​​the other end of the capacitor C48, the seventeenth pin and the nineteenth pin of the chip U4 are all grounded.

8. The remote online pressure gauge based on star flash according to claim 5 is characterized in that: Also includes capacitor C35, capacitor C36 and resistor R16; The 22nd pin of the chip U4 is electrically connected to one end of the capacitor C35, one end of the capacitor C36, one end of the resistor R16 and the power supply VCC respectively, the other end of the capacitor C35 and the other end of the capacitor C36 are both grounded, and the other end of the resistor R16 is electrically connected to the 24th pin of the chip U4.

9. The remote online pressure gauge based on star flash according to claim 4 is characterized in that: The isolation circuit includes a chip U5, a chip U7, a MOS tube Q1, a transformer T1, a rectifier circuit and a capacitor C25; The gate of the MOS tube Q1 is electrically connected to the PWM signal output end of the main control circuit, the collector of the MOS tube Q1 is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the third pin and the fourth pin of the chip U7 through the rectifier circuit, the two ends of the capacitor C25 are electrically connected to the sixth pin and the first pin of the chip U7 respectively, and the sixth pin of the chip U7 is electrically connected to the sixteenth pin of the chip U5.

10. The remote online pressure gauge based on star flash according to claim 9, characterized in that: The isolation circuit also includes a capacitor C15, a capacitor C1 and a capacitor C6; The two ends of the capacitor C15 are electrically connected to the fifteenth pin and the sixteenth pin of the chip U5 respectively, the two ends of the capacitor C1 are electrically connected to the tenth pin and the seventh pin of the chip U5 respectively, and the two ends of the capacitor C6 are electrically connected to the first pin and the second pin of the chip U5 respectively.

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