PLC driving power supply circuit structure

Abstract

The utility model relates to a PLC driving power supply circuit structure, which comprises a constant current driving power supply board, the constant current driving power supply board is used for providing stable voltage and current output, the constant current driving power supply board is electrically connected with a processor module, the constant current driving power supply board is connected with a PLC communication board through a power supply communication interface, and the PLC communication board is bidirectionally connected with the processor module; the PLC communication board comprises a transmitting circuit module and a receiving circuit module which are connected with each other, the transmitting end of the processor module is connected with the transmitting circuit module, the receiving circuit module is connected with the receiving end of the processor module, and the processor module transmits data through the transmitting circuit module so as to control accessed field equipment. The processor module analyzes PLC data through receiving feedback of the circuit module so as to perform control detection. According to the utility model, the PLC system integration is simplified, the PLC communication efficiency is further improved, and the compatibility of the PLC system is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current circuit relay control, in particular to a PLC drive power supply circuit structure. Background Art

[0002] The main disadvantages of PLC drive power circuits include high circuit complexity, strict requirements on components, and the risk of failure. These problems may affect the stability and reliability of the PLC system, thereby increasing maintenance costs.

[0003] In most existing PLC systems, the communication module and the power module are integrated together. However, since the driving power supply uses a large number of switching tubes to achieve corresponding control, this increases the complexity of the circuit and the difficulty of maintenance, which makes the synchronization of the desired circuit more difficult, which leads to reduced circuit efficiency and unstable performance.

[0004] Such an integrated PLC drive power circuit structure requires good parameter consistency of components such as switching tubes, which puts higher requirements on the selection and matching of components. The quality of components directly affects the stability and reliability of the entire power circuit. Therefore, high-quality components are needed to reduce the risk of failure, which greatly increases the production cost. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, the utility model aims to provide a PLC driving power supply circuit structure. The utility model simplifies the PLC system integration, further improves the PLC communication efficiency, and also improves the compatibility of the PLC system.

[0006] The utility model discloses a PLC driving power supply circuit structure, comprising a constant current driving power supply board, the constant current driving power supply board is used to provide stable voltage and current output, the constant current driving power supply board is electrically connected to a processor module, the constant current driving power supply board is connected to a PLC communication board through a power supply communication interface, and the PLC communication board is bidirectionally connected to the processor module;

[0007] The PLC communication board includes a sending circuit module and a receiving circuit module that are connected to each other. The sending end of the processor module is connected to the sending circuit module, and the receiving circuit module is connected to the receiving end of the processor module. The processor module sends data through the sending circuit module to control the connected field equipment. The processor module parses PLC data through feedback from the receiving circuit module to perform control detection.

[0008] In one embodiment, the transmitting circuit module includes a TXD transmitting end connected to the processor module, the TXD transmitting end is respectively connected to a first TXD data circuit and a second TXD data circuit, the first TXD data circuit and the second TXD data circuit are connected to pin 4 of the coupler L7 through a capacitor C47 after the intersection, pin 2 and pin 1 of the coupler L7 are the transmitting ends of data transmission, pin 3 of the coupler L7 is connected to a common end, a bidirectional breakdown diode D15 is connected in parallel between pin 4 and pin 3 of the coupler L7, and a resistor R53 is also connected between the intersection of the first TXD data circuit and the second TXD data circuit and the common end.

[0009] In one embodiment, the first TXD data circuit includes a capacitor C46 connected to the TXD transmitting end, the other end of the capacitor C46 is respectively connected to the positive electrode of the resistor R51 and the voltage-stabilizing diode D11, the other end of the resistor R51 is respectively connected to the resistor R50 and the base of the NPN transistor U18, the cathode of the voltage-stabilizing diode D11, the other end of the resistor R50 and the collector of the NPN transistor U18 are connected to a 12V power supply, the emitter of the NPN transistor U18 is connected to the positive electrode of the voltage-stabilizing diode D13, and the cathode of the voltage-stabilizing diode D13 intersects with the second TXD data circuit.

[0010] In one embodiment, the second TXD data circuit includes a capacitor C48 connected to the TXD transmitting end, the other end of the capacitor C48 is respectively connected to the resistor R52 and the cathode of the Zener diode D17, the other end of the resistor R52 is respectively connected to the resistor R54 and the base of the PNP transistor U19, the anode of the Zener diode D17, the other end of the resistor R54 and the collector of the PNP transistor U19 are connected to a common end, the emitter of the PNP transistor U19 is connected to the cathode of the Zener diode D14, and the anode of the Zener diode D14 intersects with the first TXD data circuit.

[0011] In one embodiment, the receiving circuit module includes a capacitor C49 connected to pin 4 of the coupler L7, the other end of the capacitor C49 is respectively connected to the negative electrode of the resistor R59, the resistor R61 and the voltage-stabilizing diode D19, the other end of the resistor R59 is respectively connected to the resistor R58 and one end of the capacitor C51, the other end of the resistor R58 is connected to the inverting input terminal of the comparator U20 and one end of the capacitor C50, the positive electrode of the voltage-stabilizing diode D19, the other end of the resistor R61, the other end of the capacitor C51 and the positive electrode of the voltage-stabilizing diode D19. The other end of the capacitor C50 is connected to the common end, the output end of the comparator U20 is respectively connected to the cathode of the voltage zener diode D18, the resistor R57 and the resistor R55, the anode of the voltage zener diode D18 is connected to the processor module and outputs PLC data, the other end of the resistor R57 is connected to a 3.3V power supply, the other end of the resistor R55 is respectively connected to the non-inverting input end of the comparator U20, the resistor R56 and the resistor R60, the other end of the resistor R56 is connected to a 12V power supply, and the other end of the resistor R60 is connected to the common end.

[0012] In one embodiment, two power supply terminals of the comparator U20 are respectively connected to a 12V power supply and a common terminal.

[0013] In one embodiment, the processor module is a 32-bit processor of model STM32F103.

[0014] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0015] 1. The utility model simplifies the integration of the PLC system. The modular design of the communication board and the power board facilitates integration into the PLC system and reduces the workload of external wiring and configuration. It further improves the PLC communication efficiency and adopts efficient encoding and decoding technology of the processor module to reduce delays and errors in the data transmission process, enhance data processing capabilities, and quickly process large amounts of data. It also improves system compatibility. The PLC communication board supports multiple communication standards and protocols and can communicate with equipment from different manufacturers. The independent design of the power board is replaceable and compatible with multiple input voltage ranges to adapt to power grid standards in different regions.

[0016] 2. The two TXD data circuits of the utility model realize the redundant design of the system, which can maintain the normal operation of the system even when some components fail, and improve the reliability of the PLC system, reduce high-frequency interference, and the filter capacitor C47 can effectively suppress the high-frequency interference signal in the power supply line and reduce the impact on the normal operation of the PLC. Through this optimized design, the PLC control system can maintain stability and reliability in a complex industrial environment.

[0017] 3. By optimizing the communication protocol and enhancing the signal processing capability, the utility model enables the PLC communication board to transmit and exchange data more quickly, realizes robust PLC communication by using digital signal control, and improves the transmission quality and reliability of signals. The PLC communication board adopts advanced power management technologies, such as overvoltage protection and overcurrent protection, to ensure stable output of power under various working conditions. The processor module supports complex data algorithms, such as data encryption, compression and error correction, to ensure the accuracy and security of data transmission.

[0018] 4. The high reliability of the communication board and power board reduces the failure rate, thereby reducing the maintenance frequency and cost. The diagnosability and testability in the circuit design facilitate rapid problem location and repair. The use of long-life components and high-durability design extends the service life of the system and further reduces long-term maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a connection diagram of a PLC drive power supply circuit structure of the utility model;

[0020] Figure 2 It is a circuit diagram of the PLC communication board of the utility model. DETAILED DESCRIPTION

[0021] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, which can be said to be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 and Figure 2 As shown, a PLC drive power circuit structure of the utility model includes a constant current drive power board, the constant current drive power board is electrically connected to the processor module, the constant current drive power board is used to provide stable voltage and current output, the constant current drive power board is connected to the PLC communication board through the power supply communication interface, and the PLC communication board is bidirectionally connected to the processor module;

[0024] The PLC communication board includes a sending circuit module and a receiving circuit module that are connected to each other. The sending end of the processor module is connected to the sending circuit module, and the receiving circuit module is connected to the receiving end of the processor module. The processor module sends data through the sending circuit module to control the connected field equipment. The processor module parses the PLC data through the feedback of the receiving circuit module to perform control detection.

[0025] The utility model simplifies the integration of the PLC system. The modular design of the communication board and the power board facilitates integration into the PLC system, reducing the workload of external wiring and configuration. It further improves the efficiency of PLC communication, adopts the efficient encoding and decoding technology of the processor module, reduces the delay and error in the data transmission process, and can enhance the data processing capability and quickly process large amounts of data. It also improves the system compatibility. The PLC communication board supports a variety of communication standards and protocols and can communicate with equipment from different manufacturers. The independent design of the power board is replaceable and compatible with a variety of input voltage ranges to adapt to the power grid standards of different regions. The sending circuit module in the PLC communication board can be connected to a variety of field equipment interfaces, such as sensors, actuators, etc., to achieve real-time control of data and use the receiving circuit module to collect feedback from field equipment. The constant current drive power board provides stable voltage and current output to ensure the stable operation of connected loads such as LEDs. For example, the model LZC8620 can be used, and a reliable LED dimming drive solution can be used to achieve AC100~265V or DC200~300V input and DC23~46V output dimming drive solutions. The constant current drive power board contains multiple protection mechanisms, such as short circuit protection and overload protection, to prevent circuit damage. Electrical isolation design can also be added to ensure that power grid fluctuations will not affect the normal operation of the PLC system. It has power factor correction function, reduces power harmonic pollution, and improves power efficiency and quality.

[0026] In one embodiment, the transmitting circuit module includes a TXD transmitting end connected to the processor module, the TXD transmitting end is respectively connected to the first TXD data circuit and the second TXD data circuit, the first TXD data circuit and the second TXD data circuit are connected to the pin 4 of the coupler L7 through the capacitor C47 after the intersection, the pin 2 and the pin 1 of the coupler L7 are the transmitting ends of data transmission, the pin 3 of the coupler L7 is connected to the common end, the bidirectional breakdown diode D15 is connected in parallel between the pin 4 and the pin 3 of the coupler L7, and the intersection of the first TXD data circuit and the second TXD data circuit and the common end is also connected with a resistor R53. The two TXD data circuits of the utility model realize the redundant design of the system, even when some components fail, the normal operation of the system can be maintained, and the reliability of the PLC system is improved, and high-frequency interference is reduced. The filter capacitor C47 can effectively suppress the high-frequency interference signal in the power supply line and reduce the impact on the normal operation of the PLC. Through this optimized design, the control system of the PLC can maintain stability and reliability in a complex industrial environment. This structure uses the pin 2 and the pin 1 of the coupler L7 as the transmitting end of data transmission to connect with the field equipment, thereby realizing the transmission of the control signal. The bidirectional breakdown diode D15 connected in parallel between pin 4 and pin 3 of coupler L7 has the main function of providing protection when the circuit pressure is relatively large. For example, when an incompatible device is connected or the receiving and transmitting signal is too large, causing the voltage in the circuit to exceed the load voltage, the bidirectional breakdown diode D25 will automatically break down and short-circuit, thus preventing the line from burning and protecting other components in the line.

[0027] Furthermore, the first TXD data circuit includes a capacitor C46 connected to the TXD transmitting end, the other end of the capacitor C46 is respectively connected to the resistor R51 and the positive electrode of the voltage-stabilizing diode D11, the other end of the resistor R51 is respectively connected to the resistor R50 and the base of the NPN transistor U18, the negative electrode of the voltage-stabilizing diode D11, the other end of the resistor R50 and the collector of the NPN transistor U18 are connected to the 12V power supply, the emitter of the NPN transistor U18 is connected to the positive electrode of the voltage-stabilizing diode D13, and the negative electrode of the voltage-stabilizing diode D13 intersects with the second TXD data circuit. Generally speaking, the processor module inputs a signal from the TXD transmitting end to the transmitting circuit module, and a TXD data path is filtered through the capacitor C46, ​​and the base current of the NPN transistor U18 changes, thereby controlling the current amplification of the NPN transistor U18 from the collector to the emitter, so that the current passing through the voltage-stabilizing diode D13 is amplified. In addition, the second TXD data circuit includes a capacitor C48 connected to the TXD transmitting end, the other end of the capacitor C48 is respectively connected to the resistor R52 and the cathode of the voltage-stabilizing diode D17, the other end of the resistor R52 is respectively connected to the resistor R54 and the base of the PNP transistor U19, the anode of the voltage-stabilizing diode D17, the other end of the resistor R54 and the collector of the PNP transistor U19 are connected to the common end, the emitter of the PNP transistor U19 is connected to the cathode of the voltage-stabilizing diode D14, and the anode of the voltage-stabilizing diode D14 intersects with the first TXD data circuit. Similarly, the other TXD data realizes the filtering function through the capacitor C48, and the base current of the PNP transistor U19 changes, thereby controlling the current from the emitter to the collector of the PNP transistor U19 to increase, and then the current passing through the voltage-stabilizing diode D14 will increase. The two TXD data are merged and combined through different states of NPN transistor U18 and PNP transistor U19, including cut-off state, amplification state and saturation state, to realize the sending of control signals.

[0028] In addition, the receiving circuit module includes a capacitor C49 connected to pin 4 of the coupler L7, the other end of the capacitor C49 is respectively connected to the negative electrode of the resistor R59, the resistor R61 and the voltage-stabilizing diode D19, the other end of the resistor R59 is respectively connected to the resistor R58 and one end of the capacitor C51, the other end of the resistor R58 is connected to the inverting input terminal of the comparator U20 and one end of the capacitor C50, the positive electrode of the voltage-stabilizing diode D19, the other end of the resistor R61, the other end of the capacitor C51 and the other end of the capacitor C50 are all connected to the common terminal, the output terminal of the comparator U20 is respectively connected to the negative electrode of the voltage-stabilizing diode D18, the resistor R57 and the resistor R55, the positive electrode of the voltage-stabilizing diode D18 is connected to the processor module and outputs PLC data, the other end of the resistor R57 is connected to the 3.3V power supply, the other end of the resistor R55 is respectively connected to the non-inverting input terminal of the comparator U20, the resistor R56 and the resistor R60, the other end of the resistor R56 is connected to the 12V power supply, and the other end of the resistor R60 is connected to the common terminal. The receiving circuit module mainly collects feedback from the on-site external device through pin 4 of the coupler L7 to achieve control detection. After filtering by capacitor C49, it uses voltage division and current shunting by various resistors to connect to the inverting input of the comparator U20, while the positive input of the comparator U20 inputs a constant voltage power supply, that is, an analog voltage signal is compared with a reference voltage, and the output at the output end of the comparator U20 is a binary signal 0 or 1. When the difference in input voltage increases or decreases and the positive and negative signs remain unchanged, its output remains constant.

[0029] By optimizing the communication protocol and enhancing the signal processing capability, the utility model enables the PLC communication board to transmit and exchange data more quickly, realizes robust PLC communication by using digital signal control, and improves the transmission quality and reliability of the signal. Advanced power management technology is adopted in the PLC communication board, such as overvoltage protection and overcurrent protection of the voltage-stabilizing diodes D11, D17 and D19, to ensure the stable output of the power supply under various working conditions. The high reliability of the PLC communication board and the constant current drive power board reduces the failure rate, thereby reducing the maintenance frequency and cost. The diagnosability and testability in the circuit design facilitate rapid problem location and maintenance. The use of long-life components and high-durability design prolongs the service life of the system and further reduces the long-term maintenance cost.

[0030] In one embodiment, the two power supply terminals of the comparator U20 are connected to a 12V power supply and a common terminal respectively. The comparator U20 can use an operational amplifier without negative feedback, so the analog circuit is powered by a single power supply. The processor module is a 32-bit processor of model STM32F103. The 32-bit MCU processor provides powerful computing power, with a clock frequency of up to 48MHz, responsible for processing the received and sent data, and realizing functions such as control. The processor module supports complex data algorithms, such as data encryption, compression and error correction, to ensure the accuracy and security of data transmission.

[0031] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application.

[0032] In the figure, the description of the positional relationship is only for illustrative purposes and cannot be understood as a limitation of this patent; obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not limitations on the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A PLC drive power circuit structure, characterized in that: It includes a constant current drive power supply board, which is used to provide stable voltage and current output, the constant current drive power supply board is electrically connected to the processor module, the constant current drive power supply board is connected to the PLC communication board through the power supply communication interface, and the PLC communication board is bidirectionally connected to the processor module; The PLC communication board includes a sending circuit module and a receiving circuit module that are connected to each other. The sending end of the processor module is connected to the sending circuit module, and the receiving circuit module is connected to the receiving end of the processor module. The processor module sends data through the sending circuit module to control the connected field equipment. The processor module parses PLC data through feedback from the receiving circuit module to perform control detection.

2. According to the PLC driving power supply circuit structure of claim 1, it is characterized in that: The sending circuit module includes a TXD sending end connected to the processor module, the TXD sending end is respectively connected to a first TXD data circuit and a second TXD data circuit, the first TXD data circuit and the second TXD data circuit are connected to pin 4 of the coupler L7 through a capacitor C47 after intersection, pin 2 and pin 1 of the coupler L7 are sending ends for data transmission, pin 3 of the coupler L7 is connected to a common end, a bidirectional breakdown diode D15 is connected in parallel between pin 4 and pin 3 of the coupler L7, and a resistor R53 is also connected between the intersection of the first TXD data circuit and the second TXD data circuit and the common end.

3. A PLC driving power supply circuit structure according to claim 2, characterized in that: The first TXD data circuit includes a capacitor C46 connected to the TXD transmitting end, the other end of the capacitor C46 is respectively connected to the positive electrode of the resistor R51 and the voltage-stabilizing diode D11, the other end of the resistor R51 is respectively connected to the resistor R50 and the base of the NPN transistor U18, the cathode of the voltage-stabilizing diode D11, the other end of the resistor R50 and the collector of the NPN transistor U18 are connected to a 12V power supply, the emitter of the NPN transistor U18 is connected to the anode of the voltage-stabilizing diode D13, and the cathode of the voltage-stabilizing diode D13 intersects with the second TXD data circuit.

4. A PLC driving power supply circuit structure according to claim 2 or 3, characterized in that: The second TXD data circuit includes a capacitor C48 connected to the TXD transmitting end, the other end of the capacitor C48 is respectively connected to the resistor R52 and the cathode of the voltage-stabilizing diode D17, the other end of the resistor R52 is respectively connected to the resistor R54 and the base of the PNP transistor U19, the anode of the voltage-stabilizing diode D17, the other end of the resistor R54 and the collector of the PNP transistor U19 are connected to a common end, the emitter of the PNP transistor U19 is connected to the cathode of the voltage-stabilizing diode D14, and the anode of the voltage-stabilizing diode D14 intersects with the first TXD data circuit.

5. A PLC drive power circuit structure according to claim 4, characterized in that: The receiving circuit module includes a capacitor C49 connected to pin 4 of the coupler L7, the other end of the capacitor C49 is respectively connected to the cathode of the resistor R59, the resistor R61 and the voltage-stabilizing diode D19, the other end of the resistor R59 is respectively connected to the resistor R58 and one end of the capacitor C51, the other end of the resistor R58 is connected to the inverting input terminal of the comparator U20 and one end of the capacitor C50, the anode of the voltage-stabilizing diode D19, the other end of the resistor R61, the other end of the capacitor C51 and the capacitor C50. The other end of C50 is connected to the common end, the output end of the comparator U20 is respectively connected to the cathode of the voltage zener diode D18, the resistor R57 and the resistor R55, the anode of the voltage zener diode D18 is connected to the processor module and outputs PLC data, the other end of the resistor R57 is connected to the 3.3V power supply, the other end of the resistor R55 is respectively connected to the non-inverting input end of the comparator U20, the resistor R56 and the resistor R60, the other end of the resistor R56 is connected to the 12V power supply, and the other end of the resistor R60 is connected to the common end.

6. A PLC drive power circuit structure according to claim 5, characterized in that: The two power supply terminals of the comparator U20 are respectively connected to a 12V power supply and a common terminal.

7. A PLC drive power circuit structure according to claim 1, characterized in that: The processor module is a 32-bit processor of model STM32F103.

Images