Acquisition control system and method based on carrier communication

Abstract

The invention discloses an acquisition control system and method based on carrier communication, and belongs to the technical field of electronic communication, the acquisition control system comprises a loop control card, a plurality of sensors and a plurality of interface modules correspondingly connected with the sensors, and the plurality of interface modules are connected with the loop control card through two buses; the loop control card is used for outputting a first carrier signal containing a power supply voltage and a carrier instruction to the interface module and receiving a second carrier signal output by the interface module, and the carrier instruction is obtained by modulating the power supply voltage by the loop control card; the second carrier signal is obtained by modulating a sampling signal output by the sensor by the interface module. The carrier command is loaded to the power supply voltage through the loop control card to form the first carrier signal, the first carrier signal is output to the interface module through the two buses, the second carrier signal modulated by the interface module is received, a line body layout in which power supply and signal transmission are separated is replaced, and therefore the complexity of an acquisition control system is simplified.

Description

Technical Field

[0001] This application relates to the field of electronic communication technology, specifically to a data acquisition and control system and method based on carrier communication. Background Technology

[0002] In the field of ship damage control monitoring and acquisition systems, the traditional signal acquisition method for related damage control monitoring systems is to directly connect acquisition boxes, junction boxes, and sensors. The power supply lines and signal transmission lines need to be separate, so repeated wiring is required in the same compartment. However, for the shipbuilding industry, it is necessary to collect various types of information for damage control monitoring systems and compartment damage and flooding alarm systems, including but not limited to equipment data such as watertight door status, flooding information, temperature information, and pressure information. Therefore, the acquisition system is extremely large, with many boxes that are scattered and complex wiring. Summary of the Invention

[0003] This invention provides a data acquisition and control system and method based on carrier communication, aiming to solve the problem that the wiring of the data acquisition and control system is complicated because the power supply line and the signal transmission line need to be separated.

[0004] In a first aspect, this application provides a data acquisition and control system based on carrier communication, including a loop control card, multiple sensors and multiple interface modules connected to each of the sensors, wherein the multiple interface modules are connected to the loop control card via a two-wire bus.

[0005] The loop control card is used to output a first carrier signal containing a power supply voltage and a carrier command to the interface module, and to receive a second carrier signal output by the interface module. The carrier command is obtained by the loop control card modulating the power supply voltage; the second carrier signal is obtained by the interface module modulating the sampling signal output by the sensor.

[0006] In one embodiment of this application, the loop control card includes:

[0007] The carrier transceiver module is used to receive control signals, modulate the power supply voltage according to the control signals to output the first carrier signal, and is also used to receive the second carrier signal and shape the second carrier signal.

[0008] A control module, connected to the carrier transceiver module, is used to output the control signal and to receive the shaped second carrier signal;

[0009] A communication module is connected to the control module, and the control module is connected to the host computer through the communication module.

[0010] In one embodiment of this application, when a single loop control card is provided, the loop control card is connected to the host computer;

[0011] The acquisition and control system also includes an integrated control unit, and multiple loop control cards are used to connect to the host computer through the integrated control unit when multiple loop control cards are available.

[0012] In one embodiment of this application, the carrier transceiver module includes a first carrier transceiver unit and a second carrier transceiver unit. According to the control signal, the first carrier transceiver unit and the second carrier transceiver unit are used to alternately output the first carrier signal and receive the second carrier signal.

[0013] In one embodiment of this application, a plurality of interface modules are connected to the loop control card via a two-bus interface to form a control loop. The loop control card has a first bus interface and a second bus interface for connecting the two-bus interface. The positive terminal of the first bus interface is connected to the first end of the first interface module in the control loop. The first end of each subsequent interface module in the control loop is connected to the first end of the previous interface module. The first end of the nth interface module in the control loop is connected to the positive terminal of the first bus interface. The negative terminal of the first bus interface is connected to the second end of each interface module in the control loop and to the negative terminal of the second bus interface.

[0014] The carrier transceiver module outputs the first carrier signal and receives the second carrier signal through the first bus interface and the second bus interface. In the event of a fault in the control loop, the first bus interface forms a first loop with the interface module in the control loop located before the fault point, and the second bus interface forms a second loop with the interface module in the control loop located after the fault point.

[0015] In one embodiment of this application, the first carrier transceiver unit and the second carrier transceiver unit have the same structure, including:

[0016] A current limiting section is used to limit the current value of the two buses;

[0017] A waveform generator is configured to modulate the power supply voltage according to the control signal to obtain the first carrier signal;

[0018] The receiving unit is used to receive the second carrier signal;

[0019] The waveform shaping unit is used to shape the second carrier signal and output the shaped signal to the control module.

[0020] In one embodiment of this application, the carrier transceiver module further includes a detection and protection unit connected to the first carrier transceiver unit and the second carrier transceiver unit.

[0021] In one embodiment of this application, multiple loop control cards are connected to the integrated control unit via a communication bus; the multiple loop control cards are connected to an external power supply via a power bus and receive power supply voltage, wherein the power supply voltage is generated by the carrier transceiver module based on the power supply voltage.

[0022] In one embodiment of this application, the loop control card further includes:

[0023] A power conversion module is used to receive the power supply voltage, convert the power supply voltage, and output it to the control module and the communication module.

[0024] A temperature and humidity detection module is used to connect to the control module and output temperature and humidity data.

[0025] In one embodiment of this application, the circuit control card has a display component and a maintenance interface on its panel. The display component and the maintenance interface are connected to the control module. The display component is used to output fault signals and analyze data, and the maintenance interface is used to receive debugging data.

[0026] In one embodiment of this application, the communication module has multiple redundant communication transceivers.

[0027] In one embodiment of this application, the carrier command includes a start bit, a command bit, and a synchronization bit.

[0028] Secondly, embodiments of this application provide a carrier communication-based acquisition and control method, applied to the carrier communication-based acquisition and control system, comprising the following steps:

[0029] The loop control card modulates the power supply voltage to obtain a first carrier signal containing the power supply voltage and carrier command. The loop control card outputs the first carrier signal to multiple interface modules connected to each sensor via a two-bus.

[0030] The sensor outputs a sampling signal according to the carrier command, the interface module modulates the sampling signal to obtain a second carrier signal, and outputs it to the loop control card through the two buses.

[0031] The beneficial effects of this application are: this application uses a loop control card to load carrier commands onto the power supply voltage to form a first carrier signal, outputs it to the interface module through a two-bus interface, and receives the second carrier signal modulated by the interface module, replacing the separate line layout of power supply and signal transmission, thereby simplifying the complexity of the acquisition and control system. Attached Figure Description

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

[0033] Figure 1 This is an architecture diagram of the data acquisition and control system provided in the embodiments of this application;

[0034] Figure 2 This is another architecture diagram of the data acquisition and control system provided in the embodiments of this application;

[0035] Figure 3 This is an architecture diagram of the loop control card provided in the embodiments of this application;

[0036] Figure 4 This is a schematic diagram of a two-bus connection provided in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of a loop fault connection provided in an embodiment of this application;

[0038] Figure 6 This is a panel structure diagram of the loop control card provided in the embodiments of this application;

[0039] Figure 7 This is a waveform diagram of the first carrier signal provided in the embodiments of this application;

[0040] Figure 8 This is a power conversion circuit diagram provided in an embodiment of this application;

[0041] Figure 9 This is a liquid crystal display driving circuit diagram provided in an embodiment of this application;

[0042] Figure 10 This is a circuit diagram of a communication transceiver driver provided in an embodiment of this application;

[0043] Figure 11 This is a circuit diagram for temperature and humidity detection provided in an embodiment of this application.

[0044] In the attached image:

[0045] 1. Loop control card; 11. Control module; 12. Carrier transceiver module; 121. First carrier transceiver unit; 122. Second carrier transceiver unit; 123. Detection and protection unit; 13. Communication module; 131. First communication transceiver; 132. Second communication transceiver; 133. Communication interface; 14. Power conversion module; 141. First voltage conversion unit; 142. Power isolation unit; 143. Second voltage conversion unit; 15. Display component; 151. LCD screen; 152. Indicator light; 16. Temperature and humidity detection unit; 17. Maintenance interface; 181. First bus interface; 182. Second bus interface; 183. Power interface; 191. First channel component; 192. Second channel component; 1 93. Loop control card addressing unit; 2. Interface module; 3. Host computer; 4. Integrated control unit; 5. External power supply; 6. Control loop; 7. Control host; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; C4. Fourth capacitor; C5. Fifth capacitor; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; R6. Sixth resistor; R7. Seventh resistor; L1. First common mode inductor; L2. Second common mode inductor; L3. Common mode filter; TVS1. Bidirectional transient suppression diode; D1. First diode; D2. Second diode; First transistor Q1; U1. Power conversion chip; U2. Isolated transceiver; U3. Temperature and humidity chip. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] A data acquisition and control system based on carrier communication, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a loop control card 1, multiple sensors and multiple interface modules 2 connected to each sensor. The multiple interface modules 2 are connected to the loop control card 1 via a two-wire bus.

[0049] The loop control card 1 is used to output a first carrier signal containing the power supply voltage and carrier command to the interface module 2, and to receive a second carrier signal output by the interface module 2. The carrier command is obtained by the loop control card 1 modulating the power supply voltage; the second carrier signal is obtained by the interface module 2 modulating the sampling signal output by the sensor.

[0050] In one alternative embodiment, the loop control card 1 includes:

[0051] The carrier transceiver module 12 is used to receive control signals, modulate the power supply voltage according to the control signals to output a first carrier signal, and also to receive a second carrier signal and shape the second carrier signal.

[0052] The control module 11 is connected to the carrier transceiver module 12 and is used to output control signals and to receive the shaped second carrier signal.

[0053] Communication module 13 connects to control module 11, and control module 11 connects to host computer 3 through communication module 13;

[0054] The power conversion module 14 is used to receive the power supply voltage, convert the power supply voltage, and output it to the control module 11 and the communication module 13.

[0055] The temperature and humidity detection module is used to connect to the control module 11 and output temperature and humidity data;

[0056] The loop control card addressing unit 193 is used to assign a unique address identifier to each loop control card 1.

[0057] The control card 1 has a display component 15 and a maintenance interface 17 on its panel. The display component 15 and the maintenance interface 17 are connected to the control module 11. The display component 15 is used to output fault signals and analyze data, and the maintenance interface 17 is used to receive debugging data.

[0058] Specifically, this application is mainly aimed at various information used in the shipbuilding industry for damage control monitoring systems and cabin damage and flooding alarm systems. The data sampled by the sensor includes, but is not limited to, watertight door status, flooding information, temperature information, pressure information, etc. The interface module 2 of this application can be set inside the sensor, or it can be an external independent interface module 2. It only needs to have signal modulation function and data transmission and reception function. The interface module 2 is connected to a two-bus and the signal acquisition and fault alarm information processing are completed by carrier modulation through the loop control card 1, and then sent to the host computer 3 for display and alarm.

[0059] This application employs a carrier communication-based signal acquisition and transmission method, changing the traditional direct connection method, thereby simplifying the acquisition system and reducing cost, weight, and equipment power consumption. It utilizes a carrier two-wire bus to perform loop acquisition of measurement point signals within the same area, accommodating both digital and analog signals, and uses carrier communication technology to transmit the measurement point information to the host computer.

[0060] In one alternative embodiment, please further refer to Figure 1 As shown, when a single loop control card 1 is provided, the loop control card 1 is connected to the host computer 3.

[0061] Specifically, the system of this application mainly includes a loop control card 1 and a sensor interface module 2, which can realize the acquisition, processing, and transmission of switch signals and analog signals. The interface module 2 can acquire voltage, current, or switch contact signals, process the signals to obtain a second carrier signal, and transmit it to the loop control card 1 via a two-wire bus. The loop control card 1, through the communication module 13, uploads all sensor signals of the loop to the host computer 3, realizing the status monitoring of the measurement point signals in the same area. The communication module 13 of this application can use CAN communication. The loop control card 1 acquires, processes, and transmits the signals of the immersion sensor and door switch sensor through the carrier two-wire bus, and uploads them to the host computer 3 through the CAN channel. The loop control card 1 can realize the short-circuit protection of the control loop 6 and monitor the measurement points on the same loop.

[0062] Specifically, the carrier communication is a wired master-slave communication mode based on a two-bus interface. That is, the two-bus interface provides power to the slave device (the sensor in this application) and transmits communication signals. The sensor mainly collects voltage, switch alarm signals, etc. from the transmitter through the interface module 2. After signal conversion, the collected data is uploaded to the loop control card 1 in the protocol communication mode, and then the loop control card 1 uploads it to the host computer 3 through the communication module 13.

[0063] The power conversion module 14 of this application uses a power conversion chip U1 with a wide voltage input range, wide temperature range, and protection performance to provide power, ensuring adaptability to fluctuations in the external power supply 5. The control module 11 uses a domestically produced low-power microprocessor with a built-in precision RC oscillator, resulting in low power consumption. To ensure the measurement accuracy of the interface module 2, the analog-to-digital conversion uses a reference source with 1 / 1000 accuracy, and the sampling resistor also uses a device with 1 / 1000 accuracy and low temperature drift. After amplification, tracking, and noise filtering, the signal is transmitted to the signal acquisition terminal of the control module 11, where the control module 11 calculates, stores, and uploads the measured values.

[0064] This application allows the host computer 3 to operate via an interface, setting the total load capacity of each loop control card 1 and configuring the type of each address interface module 2 on the two-wire bus, such as a switch module or voltage module. It can also set the alarm value for each address. These operating parameters are permanently stored locally by the loop control card 1 and the interface module 2 until modified by the host computer 3. The loop control card 1 integrates an LCD display 151. When the host computer 3 loses control and any address in the loop meets the alarm conditions, the loop control card 1 displays the alarm address on the LCD screen and issues an alarm signal.

[0065] In one alternative embodiment, such as Figure 2 As shown, it also includes an integrated control unit 4, multiple loop control cards 1 and the integrated control unit 4 are installed in the control host 7. The multiple loop control cards 1 are used to connect to the host computer 3 through the integrated control unit 4 when multiple loop control cards 1 are available.

[0066] Specifically, multiple loop control cards 1 are connected to the integrated control unit 4 via a communication bus; multiple loop control cards 1 are connected to an external power supply 5 via a power supply bus to receive the power supply voltage, which is generated by the carrier transceiver module 12 based on the power supply voltage.

[0067] In one alternative embodiment, such as Figure 3 , Figure 4 As shown, the carrier transceiver module 12 includes a first carrier transceiver unit 121 and a second carrier transceiver unit 122. According to the control signal, the first carrier transceiver unit 121 and the second carrier transceiver unit 122 alternately output a first carrier signal and receive a second carrier signal.

[0068] In one alternative embodiment, such as Figure 5 As shown, multiple interface modules 2 are connected to the loop control card 1 via a two-bus interface to form a control loop 6. The loop control card 1 has a first bus interface 181 and a second bus interface 182 for connecting the two-bus interface. The positive terminal of the first bus interface 181 is connected to the first end of the first interface module 2 in the control loop 6. The first end of each subsequent interface module 2 in the control loop 6 is connected to the first end of the previous interface module 2. The first end of the nth interface module 2 in the control loop 6 is connected to the positive terminal of the first bus interface 181. The negative terminal of the first bus interface 181 is connected to the second end of each interface module 2 in the control loop 6 and to the negative terminal of the second bus interface 182.

[0069] The carrier transceiver module 12 outputs a first carrier signal and receives a second carrier signal through the first bus interface 181 and the second bus interface 182. In the event of a fault in the control loop 6, the first bus interface 181 and the interface module 2 located before the fault point in the control loop 6 form a first loop, and the second bus interface 182 and the interface module 2 located after the fault point in the control loop 6 form a second loop.

[0070] Specifically, the bus input / output of the loop control card 1 in this application is designed with redundant first carrier transceiver unit 121 and second carrier transceiver unit 122. When there is no open or short circuit in the control loop 6, but the signal waveform of one set of carrier transceiver units is abnormal, the other set of carrier transceiver units will act as the main transceiver device to ensure the normal operation of the loop. Thus, the first carrier transceiver unit 121 and the second carrier transceiver unit 122 serve as backups for each other, reducing the utilization rate of power components by 50% and extending the service life of components. When an open or short circuit occurs at any point in the control loop 6, the two sets of circuits, the first carrier transceiver unit 121 and the second carrier transceiver unit 122, combine to complete signal acquisition and transmission without affecting the operation of the loop, realizing open and short circuit protection, and uploading the fault location to the host computer 3.

[0071] The carrier transceiver module 12 of this application also includes a detection and protection unit 123, which is connected to the first carrier transceiver unit 121 and the second carrier transceiver unit 122. After the first carrier transceiver unit 121 and the second carrier transceiver unit 122 are connected to the detection and protection unit 123, they are respectively connected to the first bus interface 181 and the second bus interface 182 through the first channel component 191. The first channel component 191 adopts a dual-channel electromagnetic compatibility (EMC) filter to filter out channel noise.

[0072] More specifically, the control module 11 of this application uses a PY32F072R1BT6 chip, wherein the microcontroller is a high-performance 32-bit... -M0+ core, a wide voltage (1.7~5.5V) operating MCU. Embedded with up to 128KB Flash memory and 16KB Static Random Access Memory, with a maximum operating frequency of 72MHz. The chip integrates multiple communication peripherals: one 12-bit analog-to-digital converter, two digital-to-analog converters, 13 timers, one USB interface, one CAN interface, three comparators, three operational amplifiers, and one LCD driver. The chip operates at a temperature of -40℃~85℃ and provides two low-power operating modes: sleep mode and stop mode, to meet various low-power applications.

[0073] The control module 11 of this application is the core of the loop control card 1. It works with the hardware to realize the control function of the board. According to the communication protocol requirements, it controls the carrier circuit to send the inspection carrier command to the two buses, and collects the alarm and fault light status information fed back by the front-end interface module 2. After the software performs composite logic judgment, the final result is uploaded to the host computer 3.

[0074] The power conversion module 14 of the loop control card 1 in this application includes a first voltage conversion unit 141, a power isolation unit 142, and a second voltage conversion unit 143. The first voltage conversion unit 141 is connected to the power interface 183 through the second channel component 192, receives a 32V power supply voltage, converts it to 5V, and transmits it to the communication module 13 through the power isolation unit 142. The second channel component 192 also uses an electromagnetic compatibility filter. The second voltage conversion unit 143 is connected to the output terminal of the first voltage conversion unit 141 and is used to convert the 5V voltage to 3.3V to power the control module 11.

[0075] The panel of the circuit control card 1 in this application is as follows: Figure 6 As shown, the loop operation parameters sent by the host computer 3 are received through the redundant CAN port and permanently stored until an authorized operator modifies them through the host computer 3. In the event of a failure of the host computer 3, if the power supply to the loop control card 1 is normal, it can operate independently according to the stored parameters, and the loop alarms, faults, etc. will be displayed by the panel indicator light 152 and the LCD screen 151.

[0076] In one optional embodiment, the first carrier transceiver unit 121 and the second carrier transceiver unit 122 have the same structure, including:

[0077] The current limiting section is used to limit the current value of the two buses;

[0078] The waveform generator is used to modulate the power supply voltage according to the control signal to obtain the first carrier signal;

[0079] The receiving unit is used to receive the second carrier signal;

[0080] The waveform shaping unit is used to shape the second carrier signal and output the shaped signal to the control module 11.

[0081] Specifically, the key hardware of the two-bus system is controlled by the microcontroller port output at different timings through software, so that different voltages are generated at the positive terminal of the bus to realize serial data loading and receive the return data from the front-end interface module 2 at the corresponding data bits.

[0082] The carrier transceiver module 12 of this application is divided into a first carrier transceiver unit 121 and a second carrier transceiver unit 122. The first carrier transceiver unit 121 and the second carrier transceiver unit 122 are respectively composed of a current limiting section, a waveform generation section, a waveform shaping section, and a code receiving section. The first carrier transceiver unit 121 and the second carrier transceiver unit 122 are independent circuits and are hot-standby for each other, working alternately to extend the service life of the devices and greatly improve the reliability of the system. They can detect both open circuit points and short circuit points on the bus, and report line faults in a timely manner.

[0083] More specifically, the communication module 13 has multiple redundant communication transceivers. In this embodiment, two communication transceivers are used as an example, including a first communication transceiver 131 and a second communication transceiver 132. The communication transceivers are connected to the host computer 3 through the communication interface 133, and the communication interface 133 is also configured to be redundant.

[0084] The loop control card 1 of this application is connected to an external power supply 5 via a power interface 183. The power supply voltage is 32V. The power supply voltage of this application is generated based on the power supply voltage and can be the same as or different from the power supply voltage. The current limiting unit is set to a current value of 2A to ensure that no larger current is output after a short circuit in the external bus, thus protecting the external power supply 5. This application also includes a main loop power switch, a carrier-end electronic switch, and a waveform shaping and discharge switch, all controlled by the control module 11. The main loop power switch can cut off the loop power supply when a short circuit in the bus is detected. When the carrier output is at a high end, the carrier-end electronic switch closes, and the waveform shaping and discharge switch pulls the bus to a low end with a steep falling edge, shaping it into a complete and regular waveform. The bus interface of this application is a differential port. Data is collected and parsed by the control module 11. The carrier-end electronic switch and the waveform shaping and discharge switch are logically controlled by the control module 11 to load serial data onto the two buses and synchronously receive the sampling data from the sensor feedback.

[0085] In one alternative embodiment, such as Figure 7As shown, the carrier command includes a start bit, a command bit, and a synchronization bit. The start bit of the carrier command in this application is the start signal for loading data onto the two-wire bus, informing the front-end sensor to be ready to receive data. The command bit includes the address and the command, which is the address of the addressed sensor and the information type, such as the front-end device at a certain address reporting its operating status, outputting analog signals, resetting, turning off indicator lights, or outputting control peripherals. The synchronization bit is the synchronization bit for the feedback information from the front-end devices such as sensors, similar to the serial data line (SDA) and serial clock line (SCL) in IIC communication. Packet synchronization is for identifying data unit boundaries, and query synchronization is for coordinating the timing of access for multiple devices. A combination of packet synchronization and query synchronization is used for data synchronization transmission and parsing to solve the problem of fast and reliable data propagation.

[0086] In one specific embodiment, the circuit diagram of the power conversion chip U1 of the loop control card 1 of this application is as follows: Figure 8 As shown, it includes:

[0087] The first diode D1 and the second diode D2 have their positive terminals used to receive the input voltage and prevent reverse connection.

[0088] The first capacitor C1 has its first terminal connected to the negative terminals of the first diode D1 and the second diode D2, and its second terminal grounded, and is used to filter the input voltage.

[0089] The power conversion chip U1 has its input terminal connected to the negative terminals of the first diode D1 and the second diode D2. It receives the voltage filtered by the first capacitor C1 and converts the voltage.

[0090] The second capacitor C2 and the third capacitor C3 have their first terminals connected to the input terminal of the power conversion chip U1, and their second terminals grounded, for filtering the output voltage of the power conversion chip U1.

[0091] In one specific embodiment, the liquid crystal display driving circuit of the loop control card 1 of this application is as follows: Figure 9As shown, the LCD screen 151 of this application uses a domestically produced color LCD screen with a resolution of 240*135, adopts a half-duplex high-speed communication mode, and has an external dimension of 17.6*31mm. The LCD display driving circuit includes a first transistor Q1. The base of the first transistor Q1 receives the LCD driving signal through a first resistor R1. When the LCD driving signal output is low, the LCD screen backlight power supply operates. The collector of the first transistor Q1 is connected to a 3.3V voltage. The emitter of the first transistor Q1 is connected to a second resistor R2, which is a backlight power supply current limiting resistor that can be adjusted according to the backlight brightness. The circuit also includes a third resistor R3. The first end of the third resistor R3 is connected to a 3.3V voltage, and the second end of the third resistor R3 is connected to the base of the first transistor Q1.

[0092] In one specific embodiment, the communication transceiver drive circuit of the loop control card 1 of this application is as follows: Figure 10 As shown, it includes:

[0093] The fourth capacitor C4 has its first terminal used to receive 3.3V voltage, and its second terminal grounded.

[0094] The isolated transceiver U2 has its differential signal pins connected to the common-mode filter L3. The output of the common-mode filter L3 is connected to the first common-mode inductor L1 and the second common-mode inductor L2, respectively. The first common-mode inductor L1 corresponds to the CANH line, and the second common-mode inductor L2 corresponds to the CANL line.

[0095] The fourth resistor, R4, is connected across the CANH and CANL lines.

[0096] The bidirectional transient voltage suppressor diode TVS1 has its two electrodes connected to the CANH line and the CANL line, respectively, and its common terminal is grounded.

[0097] The communication transceiver described in this application employs an isolated transceiver U2. The logic input and output buffers within the isolated transceiver U2 are isolated by a silicon dioxide (SiO2) insulating gate, capable of withstanding isolation voltages up to 5000 VRMS (60s) (wide-body SOIC package) and a typical CMTI of ±150kV / μs. The insulating gate blocks ground loops between the logic side and the bus side, helping to reduce noise from high ground potential differences between ports and ensuring correct data transmission. The maximum communication rate of this device is 1 Mbit / s.

[0098] In one specific embodiment, the temperature and humidity detection circuit of the loop control card 1 of this application is as follows: Figure 11 As shown, it includes:

[0099] Temperature and humidity chip U3 receives 3.3V voltage after its power supply pin is connected in series with the fifth resistor R5.

[0100] The fifth capacitor C5 has its first terminal connected to the power supply pin of the temperature and humidity chip U3, and its second terminal grounded.

[0101] The sixth resistor R6 and the seventh resistor R7 are connected to a 3.3V voltage at their first ends. The sixth resistor R6 is connected to the first output pin of the temperature and humidity chip U3 (specifically the SCL pin of the temperature and humidity chip U3), and the seventh resistor R7 is connected to the second output pin of the temperature and humidity chip U3 (specifically the SDA pin of the temperature and humidity chip U3).

[0102] The temperature and humidity chip U3 of this application communicates with the control module 11 via IIC to detect the temperature and humidity values ​​in the environment in real time. The device has a temperature measurement range of -40℃ to 120℃ and a humidity measurement range of 0 to 100%RH, with high accuracy and small error. The temperature and humidity monitoring function on the loop control card 1 is an additional safety detection function, and the detected values ​​can be uploaded to the host computer 3 via the communication interface 133.

[0103] Embodiments of this application also provide a carrier communication-based acquisition and control method, applied to a carrier communication-based acquisition and control system, comprising the following steps:

[0104] The loop control card modulates the power supply voltage to obtain a first carrier signal containing the power supply voltage and carrier command. The loop control card outputs the first carrier signal to multiple interface modules connected to each sensor via a two-bus.

[0105] The sensor outputs a sampling signal according to the carrier command, the interface module modulates the sampling signal to obtain a second carrier signal, and outputs it to the loop control card through the two buses.

[0106] The above provides a detailed description of a carrier communication-based data acquisition and control system and method provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A data acquisition and control system based on carrier communication, characterized in that, The system includes a loop control card, multiple sensors, and multiple interface modules connected to each of the sensors. The multiple interface modules are connected to the loop control card via a two-wire bus. The loop control card is used to output a first carrier signal containing a power supply voltage and a carrier command to the interface module, and to receive a second carrier signal output by the interface module. The carrier command is obtained by the loop control card modulating the power supply voltage; the second carrier signal is obtained by the interface module modulating the sampling signal output by the sensor.

2. The data acquisition and control system based on carrier communication according to claim 1, characterized in that, The loop control card includes: The carrier transceiver module is used to receive control signals, modulate the power supply voltage according to the control signals to output the first carrier signal, and is also used to receive the second carrier signal and shape the second carrier signal. A control module, connected to the carrier transceiver module, is used to output the control signal and to receive the shaped second carrier signal; A communication module is connected to the control module, and the control module is connected to the host computer (3) through the communication module.

3. The data acquisition and control system based on carrier communication according to claim 2, characterized in that, In the case of having a single loop control card, the loop control card is connected to the host computer (3); The acquisition and control system also includes an integrated control unit, and multiple loop control cards are used to connect to the host computer (3) through the integrated control unit when multiple loop control cards are available.

4. The data acquisition and control system based on carrier communication according to claim 2, characterized in that, The carrier transceiver module includes a first carrier transceiver unit and a second carrier transceiver unit. According to the control signal, the first carrier transceiver unit and the second carrier transceiver unit are used to alternately output the first carrier signal and receive the second carrier signal.

5. The data acquisition and control system based on carrier communication according to claim 4, characterized in that, Multiple interface modules are connected to the loop control card via a two-bus system to form a control loop (6). The loop control card has a first bus interface and a second bus interface for connecting the two-bus system. The positive terminal of the first bus interface is connected to the first end of the first interface module in the control loop (6). The first end of each subsequent interface module in the control loop (6) is connected to the first end of the previous interface module. The first end of the nth interface module in the control loop (6) is connected to the positive terminal of the first bus interface. The negative terminal of the first bus interface is connected to the second end of each interface module in the control loop (6) and to the negative terminal of the second bus interface. The carrier transceiver module outputs the first carrier signal and receives the second carrier signal through the first bus interface and the second bus interface. In the event of a fault in the control loop (6), the first bus interface forms a first loop with the interface module in the control loop (6) located before the fault point, and the second bus interface forms a second loop with the interface module (2) in the control loop (6) located after the fault point.

6. The data acquisition and control system based on carrier communication according to claim 4, characterized in that, The first carrier transceiver unit and the second carrier transceiver unit have the same structure, including: A current limiting section is used to limit the current value of the two buses; A waveform generator is configured to modulate the power supply voltage according to the control signal to obtain the first carrier signal; The receiving unit is used to receive the second carrier signal; The waveform shaping unit is used to shape the second carrier signal and output the shaped signal to the control module.

7. The data acquisition and control system based on carrier communication according to claim 4, characterized in that, The carrier transceiver module further includes a detection and protection unit, which is connected to the first carrier transceiver unit and the second carrier transceiver unit.

8. The data acquisition and control system based on carrier communication according to claim 3, characterized in that, Multiple loop control cards are connected to the integrated control unit via a communication bus; multiple loop control cards are connected to an external power supply (5) via a power supply bus to receive power supply voltage, which is generated by the carrier transceiver module based on the power supply voltage.

9. The data acquisition and control system based on carrier communication according to claim 8, characterized in that, The loop control card also includes: A power conversion module is used to receive the power supply voltage, convert the power supply voltage, and output it to the control module and the communication module. A temperature and humidity detection module is used to connect to the control module and output temperature and humidity data.

10. The data acquisition and control system based on carrier communication according to claim 2, characterized in that, The circuit control card has a display component and a maintenance interface on its panel. The display component and the maintenance interface are connected to the control module. The display component is used to output fault signals and analyze data. The maintenance interface is used to receive debugging data.

11. The data acquisition and control system based on carrier communication according to claim 2, characterized in that, The communication module has multiple redundant communication transceivers.

12. The data acquisition and control system based on carrier communication according to claim 1, characterized in that, The carrier command includes a start bit, a command bit, and a synchronization bit.

13. A data acquisition and control method based on carrier communication, characterized in that, The data acquisition and control system based on carrier communication as described in any one of claims 1-12 includes the following steps: The loop control card modulates the power supply voltage to obtain a first carrier signal containing the power supply voltage and carrier command. The loop control card outputs the first carrier signal to multiple interface modules connected to each sensor via a two-bus. The sensor outputs a sampling signal according to the carrier command, the interface module modulates the sampling signal to obtain a second carrier signal, and outputs it to the loop control card through the two buses.

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