A redundant power supply system and a programmable logic controller

Abstract

This utility model discloses a redundant power supply system and a programmable logic controller (PLC), relating to the field of equipment power supply technology. The redundant power supply system includes a first power supply regulator, a second power supply regulator, and multiple redundant power supply circuits. The first and second power supply regulators are used to receive AC power from an external power source and convert it to DC power. The first power input terminal of each redundant power supply circuit is connected to the power output terminal of the first power supply regulator to receive DC power from it. The second power input terminal of each redundant power supply circuit is connected to the power output terminal of the second power supply regulator to receive DC power from it. The power output terminal of each redundant power supply circuit is connected to the PLC to supply power to the PLC based on DC power. The technical solution disclosed in this utility model can improve the power supply stability of the PLC.

Description

Technical Field

[0001] This utility model relates to the field of equipment power supply technology, and in particular to a redundant power supply system and a programmable logic controller. Background Technology

[0002] In the field of modern industrial automation, Programmable Logic Controllers (PLCs) play a crucial role. As the heart of factory automation, PLCs control the operation of machinery and processes by executing preset programs, greatly improving production flexibility and efficiency. PLCs can not only quickly respond to real-time changes on the production line but also ensure operational consistency and accuracy, reducing human error. Furthermore, PLCs support complex data processing and communication functions, facilitating integration into a wider range of manufacturing execution systems for comprehensive production monitoring and management. By optimizing resource utilization and improving productivity, PLCs provide a strong competitive advantage to various industries and are one of the key technologies driving the development of intelligent manufacturing. Therefore, ensuring the stability and reliability of the power supply to programmable logic controllers is crucial for guaranteeing continuous production and maintaining a safe operating environment.

[0003] Currently, most existing PLC power supply systems rely on a single power supply circuit to power the PLC. However, this approach has significant limitations and risks. The single power supply circuit increases the risk of PLC system downtime. If the power supply circuit fails, it cannot supply power to the PLC, causing the entire PLC control system to immediately malfunction, leading to a sudden production line interruption and potentially significant economic losses. Therefore, existing power supply methods offer relatively low power supply stability for programmable logic controllers. Utility Model Content

[0004] In view of this, the present invention provides a redundant power supply system and a programmable logic controller, the main purpose of which is to solve the technical problem of low power supply stability for programmable logic controllers.

[0005] To achieve the above objectives, this utility model first provides a redundant power supply system for powering a programmable logic controller. The redundant power supply system includes a first power supply regulator, a second power supply regulator, and multiple redundant power supply circuits. The first power supply regulator and the second power supply regulator are used to connect AC power from an external power source and convert the AC power into DC power.

[0006] The first power input terminal of each of the redundant power supply circuits is connected to the power output terminal of the first power supply regulator to receive DC power from the first power supply regulator.

[0007] The second power input terminal of each of the redundant power supply circuits is connected to the power output terminal of the second power supply regulator to receive DC power from the second power supply regulator;

[0008] The power output terminal of each of the redundant power supply circuits is connected to the programmable logic controller (PLC) for supplying power to the PLC based on DC power.

[0009] In one embodiment of this utility model, the first power supply regulator and the second power supply regulator are uninterruptible power supply devices.

[0010] In one embodiment of this utility model, the redundant power supply circuit includes a first DC-DC converter, a second DC-DC converter, a first power interface circuit, and a second power interface circuit; the first positive terminal of the first DC-DC converter is connected to the positive output terminal of the first power supply regulator, and the first negative terminal of the first DC-DC converter is connected to the negative output terminal of the first power supply regulator to receive DC power from the first power supply regulator; the second positive terminal of the first DC-DC converter is connected to the positive input terminal of the first power interface circuit, and the second negative terminal of the first DC-DC converter is connected to the negative input terminal of the first power interface circuit to output DC power to the first power interface circuit; the positive output terminal of the first power interface circuit is connected to the positive terminal of the programmable logic controller, and the negative output terminal of the first power interface circuit is connected to the positive terminal of the programmable logic controller. The first positive terminal of the second DC-DC converter is connected to the negative terminal of the programmable logic controller (PLC) to supply power to the PLC; the first positive terminal of the second DC-DC converter is connected to the positive output terminal of the second power supply regulator, and the first negative terminal of the second DC-DC converter is connected to the negative output terminal of the second power supply regulator to receive DC power from the second power supply regulator; the second positive terminal of the second DC-DC converter is connected to the positive input terminal of the second power interface circuit, and the second negative terminal of the second DC-DC converter is connected to the negative input terminal of the second power interface circuit to output DC power to the second power interface circuit; the positive output terminal of the second power interface circuit is connected to the positive terminal of the PLC, and the negative output terminal of the second power interface circuit is connected to the negative terminal of the PLC to supply power to the PLC.

[0011] In one embodiment of this utility model, the redundant power supply circuit further includes a first diode and a second diode; the anode of the first diode is connected to the positive output terminal of the first power interface circuit, and the cathode of the first diode is connected to the positive terminal of the programmable logic controller; the anode of the second diode is connected to the positive output terminal of the second power interface circuit, and the cathode of the second diode is connected to the positive terminal of the programmable logic controller.

[0012] In one embodiment of this utility model, the cathode terminal of the first diode is connected to the cathode terminal of the second diode; the negative output terminal of the first power interface circuit is connected to the negative output terminal of the second power interface circuit.

[0013] In one embodiment of this utility model, the redundant power supply circuit further includes a microcontroller, a voltage and current sampling circuit, and a communication circuit; the first positive terminal of the voltage and current sampling circuit is connected to the second positive terminal of the first DC-DC converter, and the first negative terminal of the voltage and current sampling circuit is connected to the second negative terminal of the first DC-DC converter, to determine the first voltage value and the first current value of the DC power output by the first DC-DC converter, and send the first voltage value and the first current value to the microcontroller; the second positive terminal of the voltage and current sampling circuit is connected to the second positive terminal of the second DC-DC converter, and the second negative terminal of the voltage and current sampling circuit is connected to the second negative terminal of the second DC-DC converter, to determine the second voltage value and the second current value of the DC power output by the second DC-DC converter, and send the second voltage value and the second current value to the microcontroller; the signal output terminal of the microcontroller is connected to the first interactive terminal of the communication circuit, and the second interactive terminal of the communication circuit is connected to the interactive terminal of the programmable logic controller, to establish a communication connection between the microcontroller and the programmable logic controller.

[0014] In one embodiment of this utility model, the communication circuit includes a first communication unit and a second communication unit; the signal output terminal of the microcontroller is connected to the first interaction terminal of the first communication unit and the first interaction terminal of the second communication unit respectively; the second interaction terminal of the first communication unit is connected to the interaction terminal of the programmable logic controller to establish a communication connection between the microcontroller and the programmable logic controller through the first communication unit; the second interaction terminal of the second communication unit is connected to the interaction terminal of the programmable logic controller to establish a communication connection between the microcontroller and the programmable logic controller through the second communication unit.

[0015] In one embodiment of this utility model, the redundant power supply circuit further includes a power conversion circuit; the positive terminal of the power conversion circuit is connected to the cathode terminal of the first diode and the cathode terminal of the second diode, respectively, and the negative terminal of the power conversion circuit is connected to the negative output terminal of the first power interface circuit and the negative output terminal of the second power interface circuit, respectively, to obtain DC power; the power supply terminal of the power conversion circuit is connected to the power supply terminal of the microcontroller, for supplying power to the microcontroller based on the DC power.

[0016] In one embodiment of this utility model, the redundant power supply circuit further includes a first optocoupler and a second optocoupler; the microcontroller is connected to the positive output terminal and the negative output terminal of the first power supply regulator through the first optocoupler; the microcontroller is connected to the positive output terminal and the negative output terminal of the second power supply regulator through the second optocoupler.

[0017] In addition, to achieve the above objectives, this utility model also proposes a programmable logic controller, which includes the redundant power supply system described above.

[0018] This utility model provides a redundant power supply system and a programmable logic controller (PLC). A first power supply regulator and a second power supply regulator respectively receive AC power from external sources and convert the AC power to DC power. Furthermore, each redundant power supply circuit receives DC power from both the first and second power supply regulators and supplies power to the PLC based on the received DC power. The technical solution provided by this application can supply power to the PLC through multiple redundant power supply circuits. Even if one redundant power supply circuit fails, the PLC can still be powered by other normal redundant power supply circuits, thus improving the power supply stability to the PLC.

[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1This illustration shows one of the structural schematic diagrams of a redundant power supply system provided by an embodiment of the present invention;

[0022] Figure 2 This is a second schematic diagram of a redundant power supply system provided by an embodiment of the present invention;

[0023] Figure 3 The third schematic diagram shows a redundant power supply system provided by an embodiment of the present invention. Detailed Implementation

[0024] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0025] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0026] The following is combined Figures 1 to 3 This invention describes a redundant power supply system and a programmable logic controller according to some embodiments of the present invention.

[0027] like Figure 1 As shown, one embodiment of this utility model proposes a redundant power supply system, such as... Figure 1 As shown, the redundant power supply system includes a first power supply regulator 100, a second power supply regulator 200, and multiple redundant power supply circuits 300. The first power supply regulator 100 and the second power supply regulator 200 are used to receive AC power from an external power source (not shown) and convert the AC power into 24V DC power to supply the DC power to each redundant power supply circuit 300. The external power source can be an external AC power source or the neutral and live wires for transmitting AC power. Specifically, the first power supply regulator 100 and the second power supply regulator 200 are both uninterruptible power supplies (UPS). The UPS can immediately switch to battery power when the mains power is interrupted to continuously power the PLC. Furthermore, the UPS also has protection against power quality problems such as voltage surges, drops, and spikes, preventing damage to the PLC due to power supply issues when an external power source experiences an abnormality.

[0028] Specifically, the first power input terminal of each redundant power supply circuit 300 is connected to the power output terminal of the first power supply regulator 100 to receive DC power from the first power supply regulator 100. Simultaneously, the second power input terminal of each redundant power supply circuit 300 is connected to the power output terminal of the second power supply regulator 200 to receive DC power from the second power supply regulator 200; furthermore, the power output terminal of each redundant power supply circuit is connected to the programmable logic controller 400 to supply power to the programmable logic controller 400 based on DC power.

[0029] Based on this, when either the first power supply regulator 100 or the second power supply regulator 200 fails, each redundant power supply circuit 300 can obtain power from the power supply regulator that is not faulty, thereby improving the stability of the PCL power supply.

[0030] The redundant power supply system provided in this application includes a first power supply regulator and a second power supply regulator, which are used to receive AC power from an external source and convert the AC power into DC power. Furthermore, each redundant power supply circuit receives DC power from both the first and second power supply regulators and supplies power to the programmable logic controller (PLC) based on the received DC power. The technical solution provided in this application enables multiple redundant power supply circuits to jointly power the PLC, and even if one redundant power supply circuit fails, other normal redundant power supply circuits can still supply power to the PLC, thus improving the power supply stability to the PLC.

[0031] In one embodiment, such as Figure 2 As shown, the redundant power supply circuit includes a first DC-DC converter 310, a second DC-DC converter 320, a first power interface circuit 330, and a second power interface circuit 340. The first DC-DC converter 310 and the second DC-DC converter 320 can each be an isolated DC-DC converter. The isolated DC-DC converters provide electrical isolation, ensuring electrical isolation between the first power supply regulator 100 and the programmable logic controller 400 through the first DC-DC converter 310, and ensuring electrical isolation between the second power supply regulator 200 and the programmable logic controller 400 through the second DC-DC converter 320. This protects the programmable logic controller 400 from high-voltage surges and ensures the operational stability of the programmable logic controller 400.

[0032] Specifically, the first positive terminal of the first DC-DC converter 310 is connected to the positive output terminal of the first power supply regulator 100, and the first negative terminal of the first DC-DC converter 310 is connected to the negative output terminal of the first power supply regulator 100, so as to receive DC power from the first power supply regulator 100.

[0033] Furthermore, the second positive terminal of the first DC-DC converter 310 is connected to the positive input terminal of the first power interface circuit 330, and the second negative terminal of the first DC-DC converter 310 is connected to the negative input terminal of the first power interface circuit 330, so as to output DC power to the first power interface circuit 330.

[0034] Furthermore, the positive output terminal of the first power interface circuit 330 is connected to the positive terminal of the programmable logic controller 400, and the negative output terminal of the first power interface circuit 330 is connected to the negative terminal of the programmable logic controller 400, to supply power to the programmable logic controller 400. Here, the first power interface circuit 330 is used to connect the first DC-DC converter 310 to the programmable logic controller 400, so that the first DC-DC converter 310 can output DC power to the programmable logic controller 400. Specifically, the first power interface circuit 330 can be connected to the power supply interface on the backplane of the programmable logic controller 400 to supply power to the programmable logic controller 400.

[0035] Furthermore, the first positive terminal of the second DC-DC converter 320 is connected to the positive output terminal of the second power supply regulator 200, and the first negative terminal of the second DC-DC converter 320 is connected to the negative output terminal of the second power supply regulator 200, so as to receive DC power from the second power supply regulator 200.

[0036] Furthermore, the second positive terminal of the second DC-DC converter 320 is connected to the positive input terminal of the second power interface circuit 340, and the second negative terminal of the second DC-DC converter 320 is connected to the negative input terminal of the second power interface circuit 340, so as to output DC power to the second power interface circuit 340.

[0037] Furthermore, the positive output terminal of the second power interface circuit 340 is connected to the positive terminal of the programmable logic controller 400, and the negative output terminal of the second power interface circuit 340 is connected to the negative terminal of the programmable logic controller 400 to supply power to the programmable logic controller 400. Here, the second power interface circuit 340 is used to connect the second DC-DC converter 320 to the programmable logic controller 400 so that the second DC-DC converter 320 can output DC power to the programmable logic controller 400. Specifically, the second power interface circuit 340 can also be connected to the power supply interface on the backplane of the programmable logic controller 400 to supply power to the programmable logic controller 400.

[0038] The embodiments provided in this application can electrically isolate the programmable logic controller from the first power supply regulator based on the first DC-DC converter, and electrically isolate the programmable logic controller from the second power supply regulator based on the second DC-DC converter, so as to provide electrical protection for the programmable logic controller and improve the power supply stability of the programmable logic controller.

[0039] In one embodiment, such as Figure 2 As shown, the redundant power supply circuit also includes a first diode 350 and a second diode 360, wherein the first diode 350 and the second diode 360 ​​can be anti-reverse diodes, respectively.

[0040] Specifically, the anode of the first diode 350 is connected to the positive output terminal of the first power interface circuit 330, and the cathode of the first diode 350 is connected to the positive terminal of the programmable logic controller 400; the anode of the second diode 360 ​​is connected to the positive output terminal of the second power interface circuit 340, and the cathode of the second diode 360 ​​is connected to the positive terminal of the programmable logic controller 400.

[0041] The embodiments provided in this application can provide reverse connection protection for the redundant power supply system based on the first diode and the second diode, preventing the redundant power supply circuit in the redundant power supply system from being subjected to voltage or current surges, thereby improving the power supply stability of the redundant power supply system.

[0042] In one embodiment, such as Figure 3 As shown, the cathode of the first diode 350 is connected to the cathode of the second diode 360; the negative output terminal of the first power interface circuit 330 is connected to the negative output terminal of the second power interface circuit 340.

[0043] Furthermore, the redundant power supply circuit also includes a microcontroller (MCU), a voltage and current sampling circuit 370, and a communication circuit 380. The MCU is communicatively connected to both the voltage and current sampling circuit 370 and the communication circuit 380. The MCU can be a computer device with certain data storage and computing capabilities. The voltage and current sampling circuit 370 can collect voltage and current values ​​from the circuit.

[0044] Specifically, the first positive terminal of the voltage and current sampling circuit 370 is connected to the second positive terminal of the first DC-DC converter 310, and the first negative terminal of the voltage and current sampling circuit 370 is connected to the second negative terminal of the first DC-DC converter 310, so as to determine the first voltage value and the first current value of the DC output by the first DC-DC converter, and send the first voltage value and the second current value to the microcontroller MCU; here, the voltage and current sampling circuit 370 may have a first current sensor (not shown in the figure) and a first voltage sensor (not shown in the figure). The first voltage sensor is used to collect the first voltage value of the voltage output from the second positive terminal of the first DC-DC converter 310, and the first current sensor is used to collect the first current value of the current output from the second positive terminal of the first DC-DC converter 310, and send the first voltage value and the first current value in analog form to the microcontroller MCU.

[0045] Furthermore, the second positive terminal of the voltage and current sampling circuit 370 is connected to the second positive terminal of the second DC-DC converter 320, and the second negative terminal of the voltage and current sampling circuit 370 is connected to the second negative terminal of the second DC-DC converter 320, so as to determine the second voltage value and the second current value of the DC output by the second DC-DC converter 320, and send the second voltage value and the second current value to the microcontroller MCU; here, the voltage and current sampling circuit 370 may have a second current sensor (not shown in the figure) and a second voltage sensor (not shown in the figure). The second voltage sensor is used to collect the second voltage value of the voltage output from the second positive terminal of the second DC-DC converter 320, and the second current sensor is used to collect the second current value of the current output from the second positive terminal of the second DC-DC converter 320, and send the second voltage value and the second current value in analog form to the microcontroller MCU.

[0046] Furthermore, the signal output terminal of the microcontroller MCU is connected to the first interaction terminal of the communication circuit 380, and the second interaction terminal of the communication circuit 380 is connected to the interaction terminal of the programmable logic controller 400, so as to establish a communication connection between the microcontroller MCU and the programmable logic controller 400.

[0047] Furthermore, the communication circuit 380 includes a first communication unit RCU1 and a second communication unit RCU2; the first communication unit and the second communication unit can be remote communication units (RCUs), which are components used to realize long-distance data exchange between devices or between devices and control systems. Remote communication units are usually integrated in various application scenarios such as automation systems, IoT devices, and industrial control systems to ensure that data can be effectively transmitted and received.

[0048] Specifically, the signal output terminal of the microcontroller (MCU) is connected to the first interaction terminal of the first communication unit RCU1 and the first interaction terminal of the second communication unit RCU2, respectively. The second interaction terminal of the first communication unit RCU1 is connected to the interaction terminal of the programmable logic controller (PLC) 400 to establish a communication connection between the microcontroller (MCU) and the PLC 400. Furthermore, the second interaction terminal of the second communication unit RCU2 is connected to the interaction terminal of the PLC 400 to establish a communication connection between the microcontroller (MCU) and the PLC 400. Therefore, even if one communication unit malfunctions, the microcontroller (MCU) can still establish a communication connection with the PLC 400 through the other communication unit, ensuring the reliability of communication between the microcontroller (MCU) and the PLC 400.

[0049] The embodiments provided in this application include a microcontroller, a voltage and current sampling circuit, and a communication circuit in the redundant power supply circuit. The voltage and current sampling circuit can collect the voltage and current values ​​of the DC power output from the first DC-DC converter and the second DC-DC converter. In practical use, an existing current and voltage monitoring program can be set in the microcontroller to monitor the voltage and current values ​​output from the first DC-DC converter and the second DC-DC converter, and the monitoring results can be sent to the PLC, providing a hardware foundation for the redundant power supply system to realize the voltage and current monitoring function.

[0050] In one embodiment, such as Figure 3 As shown, the redundant power supply circuit also includes a power conversion circuit 390; wherein, the power conversion circuit 390 can be a power conversion conditioning circuit, which is a circuit used to convert the input power into a power supply suitable for a specific device or system. It has functions such as voltage conversion and voltage regulation to ensure the stability and reliability of the power supply output to the microcontroller MCU.

[0051] Specifically, the positive terminal of the power conversion circuit 390 is connected to the negative terminal of the first diode 350 and the negative terminal of the second diode 360, respectively, and the negative terminal of the power conversion circuit 390 is connected to the negative output terminal of the first power interface circuit 330 and the negative output terminal of the second power interface circuit 340, respectively, to obtain direct current.

[0052] Furthermore, the power supply terminal of the power conversion circuit 390 is connected to the power supply terminal of the microcontroller MCU to supply power to the microcontroller MCU. Here, the main body of the power conversion circuit 390 may include a switching regulator for obtaining DC power from the cathode of the first diode 350 and the negative output terminal of the first power interface circuit 330, or obtaining DC power from the cathode of the second diode 360 ​​and the negative output terminal of the second power interface circuit 340, and performing voltage regulation and conversion on the DC power to convert the obtained DC power voltage into a DC voltage suitable for supplying power to the microcontroller MCU.

[0053] The embodiments provided in this application allow the microcontroller to obtain power from the internal redundant power supply circuit where it resides. As long as any DC-DC converter in the redundant power supply circuit is in normal working condition, the microcontroller can be in operation, thus improving the power supply stability of the microcontroller.

[0054] In one embodiment, such as Figure 3 As shown, the redundant power supply circuit also includes a first optocoupler OC1 and a second optocoupler OC2. Specifically, the microcontroller MCU is connected to the positive output terminal and the negative output terminal of the first power supply regulator 100 through the first optocoupler OC1. Here, the first optocoupler OC1 can establish an electrical connection between the first power supply regulator 100 and the microcontroller MCU, and establish electrical isolation between the first power supply regulator 100 and the microcontroller MCU. In actual operation, if the microcontroller MCU needs to collect the output current and output voltage of the first power supply regulator 100, the first optocoupler OC1 can establish electrical isolation between the first power supply regulator 100 and the microcontroller MCU, preventing the high voltage or high current that may be output by the first power supply regulator 100 from being conducted to the microcontroller MCU, thereby improving the operational stability of the microcontroller MCU.

[0055] Furthermore, the microcontroller (MCU) is connected to both the positive and negative output terminals of the second power supply regulator (200) via the second optocoupler (OC2). This establishes an electrical connection between the second power supply regulator (200) and the MCU, while simultaneously providing electrical isolation between them. Similarly, if the MCU needs to acquire the output current and voltage of the second power supply regulator (200), the second optocoupler (OC2) can provide electrical isolation between them, preventing any high voltage or current output from the second power supply regulator (200) from being conducted to the MCU, thus avoiding damage and improving the MCU's operational stability.

[0056] Furthermore, the redundant power supply circuit may also include a first power acquisition unit (not shown in the figure) and a second power acquisition unit (not shown in the figure), wherein the first power acquisition unit and the second power acquisition unit may be voltage and current acquisition devices such as a power quality analyzer or energy metering ICs. Specifically, the first power acquisition unit may be set at the positive output terminal of the first power supply regulator 100 to acquire the first output voltage value and the first output current value of the DC power output by the first power supply regulator 100; furthermore, the signal output terminal of the first power acquisition unit is connected to the input terminal of the first optocoupler OC1, and the output terminal of the first optocoupler OC1 is connected to the microcontroller MCU, so that the first output voltage value and the first output current value acquired by the first power acquisition unit can be sent to the microcontroller MCU.

[0057] Specifically, the second power acquisition device can be located at the positive output terminal of the second power supply regulator 200 to acquire the second output voltage and second output current values ​​of the DC power output from the second power supply regulator 200. Furthermore, the signal output terminal of the second power acquisition device is connected to the input terminal of the second optocoupler OC2, and the output terminal of the second optocoupler OC2 is connected to the microcontroller MCU, so that the second output voltage and second output current values ​​acquired by the second power acquisition device can be sent to the microcontroller MCU. Based on this, a hardware foundation can be provided for the microcontroller MCU to monitor the voltage and current output by the first power supply regulator 100 and the second power supply regulator 200 in real time.

[0058] The technical solution provided in this application can establish electrical isolation between the microcontroller and the first and second power supply regulators based on the first and second optocouplers. When the microcontroller collects the voltage or current signals output by the first and second power supply regulators, it prevents the microcontroller from being subjected to electrical energy surges and improves the working stability of the microcontroller.

[0059] It should be noted that the selection of microcontrollers, power conversion circuits, communication circuits, voltage and current sampling circuits, and the internal circuit connection method of the redundant power supply system can be determined according to actual conditions, and this embodiment does not impose specific limitations. Furthermore, the connection method of each device can be determined according to the specific selection of the device, and this embodiment also does not impose specific limitations. The circuit function of the redundant power supply system provided in this embodiment is mainly realized through the circuit connection relationship between various circuit modules, and does not depend on the program module in a particular circuit module. In addition, each circuit module in the redundant power supply system can be implemented using analog circuits or digital circuits, and for circuit modules that can have program modules embedded, their module functions can be implemented using program modules provided by existing technologies.

[0060] On the other hand, embodiments of the present invention provide a programmable logic controller (PLC) that includes a redundant power supply system as described above, and the PLC can obtain power through the redundant power supply system.

[0061] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A redundant power supply system for supplying power to a programmable logic controller, characterized in that, The redundant power supply system includes a first power supply regulator, a second power supply regulator, and multiple redundant power supply circuits. The first power supply regulator and the second power supply regulator are used to receive AC power from an external power source and convert the AC power into DC power. The first power input terminal of each of the redundant power supply circuits is connected to the power output terminal of the first power supply regulator to receive DC power from the first power supply regulator. The second power input terminal of each of the redundant power supply circuits is connected to the power output terminal of the second power supply regulator to receive DC power from the second power supply regulator; The power output terminal of each of the redundant power supply circuits is connected to the programmable logic controller (PLC) for supplying power to the PLC based on DC power.

2. The redundant power supply system according to claim 1, characterized in that, The first voltage regulator and the second voltage regulator are both uninterruptible power supply devices.

3. The redundant power supply system according to claim 1, characterized in that, The redundant power supply circuit includes a first DC-DC converter, a second DC-DC converter, a first power interface circuit, and a second power interface circuit. The first positive terminal of the first DC-DC converter is connected to the positive output terminal of the first power supply regulator, and the first negative terminal of the first DC-DC converter is connected to the negative output terminal of the first power supply regulator, so as to receive DC power from the first power supply regulator; The second positive terminal of the first DC-DC converter is connected to the positive input terminal of the first power interface circuit, and the second negative terminal of the first DC-DC converter is connected to the negative input terminal of the first power interface circuit, so as to output DC power to the first power interface circuit. The positive output terminal of the first power interface circuit is connected to the positive terminal of the programmable logic controller, and the negative output terminal of the first power interface circuit is connected to the negative terminal of the programmable logic controller to supply power to the programmable logic controller. The first positive terminal of the second DC-DC converter is connected to the positive output terminal of the second power supply regulator, and the first negative terminal of the second DC-DC converter is connected to the negative output terminal of the second power supply regulator to receive DC power from the second power supply regulator; The second positive terminal of the second DC-DC converter is connected to the positive input terminal of the second power interface circuit, and the second negative terminal of the second DC-DC converter is connected to the negative input terminal of the second power interface circuit, so as to output DC power to the second power interface circuit. The positive output terminal of the second power interface circuit is connected to the positive terminal of the programmable logic controller, and the negative output terminal of the second power interface circuit is connected to the negative terminal of the programmable logic controller to supply power to the programmable logic controller.

4. The redundant power supply system according to claim 3, characterized in that, The redundant power supply circuit also includes a first diode and a second diode; The anode of the first diode is connected to the positive output terminal of the first power interface circuit, and the cathode of the first diode is connected to the positive terminal of the programmable logic controller. The anode of the second diode is connected to the positive output terminal of the second power interface circuit, and the cathode of the second diode is connected to the positive terminal of the programmable logic controller.

5. The redundant power supply system according to claim 4, characterized in that, The cathode of the first diode is connected to the cathode of the second diode; The negative output terminal of the first power interface circuit is connected to the negative output terminal of the second power interface circuit.

6. The redundant power supply system according to claim 4, characterized in that, The redundant power supply circuit also includes a microcontroller, a voltage and current sampling circuit, and a communication circuit. The first positive terminal of the voltage and current sampling circuit is connected to the second positive terminal of the first DC-DC converter, and the first negative terminal of the voltage and current sampling circuit is connected to the second negative terminal of the first DC-DC converter, so as to determine the first voltage value and the first current value of the DC output by the first DC-DC converter, and send the first voltage value and the first current value to the microcontroller. The second positive terminal of the voltage and current sampling circuit is connected to the second positive terminal of the second DC-DC converter, and the second negative terminal of the voltage and current sampling circuit is connected to the second negative terminal of the second DC-DC converter, so as to determine the second voltage value and the second current value of the DC output by the second DC-DC converter, and send the second voltage value and the second current value to the microcontroller; The signal output terminal of the microcontroller is connected to the first interaction terminal of the communication circuit, and the second interaction terminal of the communication circuit is connected to the interaction terminal of the programmable logic controller, so as to establish a communication connection between the microcontroller and the programmable logic controller.

7. The redundant power supply system according to claim 6, characterized in that, The communication circuit includes a first communication unit and a second communication unit; The signal output terminal of the microcontroller is connected to the first interaction terminal of the first communication unit and the first interaction terminal of the second communication unit, respectively. The second interaction terminal of the first communication unit is connected to the interaction terminal of the programmable logic controller to establish a communication connection between the microcontroller and the programmable logic controller through the first communication unit; The second communication unit's second interaction terminal is connected to the programmable logic controller's interaction terminal to establish a communication connection between the microcontroller and the programmable logic controller through the second communication unit.

8. The redundant power supply system according to claim 6, characterized in that, The redundant power supply circuit also includes a power conversion circuit. The positive terminal of the power conversion circuit is connected to the cathode terminal of the first diode and the cathode terminal of the second diode, respectively, and the negative terminal of the power conversion circuit is connected to the negative output terminal of the first power interface circuit and the negative output terminal of the second power interface circuit, respectively, to obtain DC power. The power supply terminal of the power conversion circuit is connected to the power supply terminal of the microcontroller, and is used to supply power to the microcontroller based on the DC power.

9. The redundant power supply system according to claim 6, characterized in that, The redundant power supply circuit also includes a first optocoupler and a second optocoupler. The microcontroller is connected to the positive output terminal and the negative output terminal of the first power supply regulator through the first optocoupler. The microcontroller is connected to the positive output terminal and the negative output terminal of the second power supply regulator via the second optocoupler.

10. A programmable logic controller, characterized in that, The programmable logic controller includes a redundant power supply system as described in any one of claims 1 to 9.

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