Surge protection circuit and signal input and output device
By designing surge protection circuits in the signal input and output device and using physical isolation modules to prevent signal interference, the inaccurate data acquisition and equipment damage caused by electromagnetic wave interference in industrial sites are solved, and the stability of the device is ensured.
Patent Information
- Application Number
- CN202420878724.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-24
AI Technical Summary
Existing signal input and output devices are susceptible to electromagnetic wave interference in industrial sites, resulting in inaccurate data acquisition or equipment damage, and lack of effective surge protection measures.
A surge protection circuit including main control module, power module, CAN transceiver module, USB to CAN bus control module, IO expansion module, input isolation module and output isolation module was designed to prevent signals by physically isolating the input and output signals. Interference to ensure the working stability of the device.
It realizes physical isolation between the input signal and the output signal, prevents signal interference, improves the working stability of the signal input and output device, and avoids data acquisition errors and equipment damage caused by electromagnetic wave interference.
Smart Images
Figure CN222169326U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of signal input and output devices, in particular to a surge protection circuit and a signal input and output device. Background Art
[0002] In the prior art, signal input and output devices such as bus modules are widely used in industrial automatic control systems. The signal input and output device is provided with at least one network port, which is connected to the host control system for data transmission. The input end of the signal input and output device is connected to industrial equipment such as reed relays, operating switches, measuring instruments, temperature sensors, flow sensors, pressure sensors, and liquid level transmitters through a connecting cable to collect data from the industrial equipment; or, the output end of the signal input and output device is connected to the industrial equipment to realize the remote control function of the industrial equipment.
[0003] However, there are many industrial field devices, complicated connecting cables, and large electromagnetic interference. When the existing signal input and output devices receive electromagnetic interference, it is easy to cause inaccurate data collection or even damage the equipment. Therefore, inventing a reliable surge protection circuit and signal input and output device is an urgent problem to be solved by technicians in this field. Utility Model Content
[0004] The purpose of the present application is to provide a surge protection circuit and a signal input and output device. In this solution, physical isolation of input signals and output signals can be achieved to prevent signal interference, play an isolation control and protection role, and ensure the working stability of the signal input and output device.
[0005] In order to solve the above technical problems, the present application provides a surge protection circuit, including a main control module, a power module, a CAN transceiver module, a USB to CAN bus control module, an IO expansion module, an input isolation module and an output isolation module;
[0006] The power supply module is electrically connected to the main control module, the CAN transceiver module, the USB to CAN bus control module, the IO expansion module, the input isolation module and the output isolation module respectively;
[0007] The USB to CAN bus control module is electrically connected to the CAN transceiver module, the CAN transceiver module is electrically connected to the main control module, and the host computer is electrically connected to the USB to CAN bus control module;
[0008] The main control module is electrically connected to the IO expansion module, the IO expansion module is electrically connected to the input isolation module, the input isolation module is electrically connected to the output isolation module, and the output isolation module is electrically connected to the output load.
[0009] Preferably, the surge protection circuit further includes a signal processing module;
[0010] The signal processing module is electrically connected to the CAN transceiver module.
[0011] Preferably, the signal processing module includes a common mode filtering unit and an electrostatic protection unit;
[0012] The common mode filtering unit is electrically connected to the CAN transceiver module, and the electrostatic protection unit is electrically connected to the common mode filtering unit.
[0013] Preferably, the surge protection circuit further includes a switch control module;
[0014] The switch control module is electrically connected to the main control module, the power module and the IO expansion module respectively.
[0015] Preferably, the input isolation module comprises a first input isolation unit;
[0016] The first input isolation unit is electrically connected to the IO expansion module and the output isolation module respectively.
[0017] Preferably, the first input isolation unit comprises a first static electronic unit and a first input isolation sub-unit;
[0018] The first input isolation sub-unit is electrically connected to the IO expansion module, the power module and the first static sub-unit respectively, and the first static sub-unit is electrically connected to the power module and the output isolation module respectively.
[0019] Preferably, the input isolation module further comprises a second input isolation unit;
[0020] The second input isolation unit is electrically connected to the IO expansion module and the output isolation module respectively.
[0021] Preferably, the output isolation module comprises a first output isolation unit;
[0022] The first output isolation unit is electrically connected to the power module, the input isolation module and the output load respectively.
[0023] Preferably, the first output isolation unit comprises a first switch sub-unit and a first output isolation sub-unit;
[0024] The first output isolation sub-unit is electrically connected to the power module, the first switch sub-unit and the output load respectively, and the first switch sub-unit is electrically connected to the input isolation module.
[0025] In order to solve the above technical problems, the present application provides a signal input and output device, including the above-mentioned surge protection circuit.
[0026] A surge protection circuit and a signal input and output device of the utility model have the following beneficial effects. A surge protection circuit disclosed in the utility model includes a main control module, a CAN transceiver module, a USB to CAN bus control module, an IO expansion module, an input isolation module and an output isolation module; the USB to CAN bus control module is electrically connected to the CAN transceiver module, the CAN transceiver module is electrically connected to the main control module, and the host computer is electrically connected to the USB to CAN bus control module; the main control module is electrically connected to the IO expansion module, the IO expansion module is electrically connected to the input isolation module, the input isolation module is electrically connected to the output isolation module, and the output isolation module is electrically connected to the output load. Therefore, the utility model can realize the physical isolation of input and output signals, prevent signal interference, play an isolation control and protection role, and ensure the working stability of the signal input and output device. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:
[0028] Figure 1 It is a schematic diagram of a principle block diagram of a surge protection circuit of a preferred embodiment of the utility model;
[0029] Figure 2 It is a schematic diagram of a principle block diagram of a surge protection circuit of a preferred embodiment of the utility model;
[0030] Figure 3 This is a circuit schematic diagram of a common mode filter unit of a preferred embodiment of the utility model;
[0031] Figure 4 This is a circuit schematic diagram of an electrostatic protection unit of a preferred embodiment of the utility model;
[0032] Figure 5 This is a circuit diagram of a USB to CAN bus control module of a preferred embodiment of the utility model
[0033] Figure 6 This is a circuit schematic diagram of a CAN transceiver module of a preferred embodiment of the utility model;
[0034] Figure 7This is a circuit schematic diagram of a switch control module of a preferred embodiment of the utility model;
[0035] Figure 8 This is a circuit schematic diagram of an IO expansion module of a preferred embodiment of the utility model;
[0036] Fig. 9 This is a circuit schematic diagram of an input isolation module of a preferred embodiment of the utility model;
[0037] Fig.10 The utility model is a circuit diagram of an output isolation module of a preferred embodiment. DETAILED DESCRIPTION
[0038] The core of this application is to provide a surge protection circuit and a signal input and output device. In this solution, it is possible to achieve physical isolation of input signals and output signals, prevent signal interference, play an isolation control and protection role, and ensure the working stability of the signal input and output device.
[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0040] See also Figure 1 , Figure 1 A schematic block diagram of a surge protection circuit provided in the present application, comprising a main control module 1, a power module 2, a CAN transceiver module 3, a USB to CAN bus control module 4, an IO expansion module 5, an input isolation module 6 and an output isolation module 7;
[0041] The power module 2 is electrically connected to the main control module 1, the CAN transceiver module 3, the USB to CAN bus control module 4, the IO expansion module 5, the input isolation module 6 and the output isolation module 7 respectively;
[0042] The USB to CAN bus control module 4 is electrically connected to the CAN transceiver module 3, the CAN transceiver module 3 is electrically connected to the main control module 1, and the host computer is electrically connected to the USB to CAN bus control module 4;
[0043] The main control module 1 is electrically connected to the IO expansion module 5 , the IO expansion module 5 is electrically connected to the input isolation module 6 , the input isolation module 6 is electrically connected to the output isolation module 7 , and the output isolation module 7 is electrically connected to the output load.
[0044] In the prior art, there are many industrial field devices, complicated connecting cables, and large electromagnetic interference. When the existing signal input and output devices receive electromagnetic interference, it is easy to cause inaccurate data collection, or even damage the equipment.
[0045] In response to the above shortcomings, in this application, physical isolation of input signals and output signals is achieved through the cooperation of the main control module 1, the power module 2, the CAN transceiver module 3, the USB to CAN bus control module 4, the IO expansion module 5, the input isolation module 6 and the output isolation module 7.
[0046] Specifically, in this embodiment, the main control module 1 is set to MCU (Microcontroller Unit), also known as a single-chip microcomputer (Single Chip Microcomputer) or a single-chip microcomputer, which appropriately reduces the frequency and specifications of the central processing unit (CPU), and integrates peripheral interfaces such as memory, timer, USB, A / D conversion, UART, PLC, DMA, and even LCD drive circuits on a single chip to form a chip-level computer.
[0047] Specifically, in this embodiment, the network connection line is connected to the host computer and the USB interface respectively, the USB to CAN bus control module 4 is used to realize the conversion of USB signals to CAN signals, the CAN transceiver module 3 is used to cooperate with the main control module 1 to realize the transceiver control of CAN communication signals; the IO expansion module 5 is used to realize the expansion of input and output signal ports to meet the needs of more scenarios; the input isolation module 6 and the output isolation module 7 are respectively used to physically isolate the input signal and the output signal so that they do not interfere with each other, thereby playing a role of isolation control and protection.
[0048] In summary, the present application provides a surge protection circuit, which includes a main control module 1, a CAN transceiver module 3, a USB to CAN bus control module 4, an IO expansion module 5, an input isolation module 6 and an output isolation module 7; the USB to CAN bus control module 4 is electrically connected to the CAN transceiver module 3, the CAN transceiver module 3 is electrically connected to the main control module 1, and the host computer is electrically connected to the USB to CAN bus control module 4; the main control module 1 is electrically connected to the IO expansion module 5, the IO expansion module 5 is electrically connected to the input isolation module 6, the input isolation module 6 is electrically connected to the output isolation module 7, and the output isolation module 7 is electrically connected to the output load. Therefore, the utility model can achieve physical isolation of input signals and output signals, prevent signal interference, play an isolation control and protection role, and ensure the working stability of the signal input and output device.
[0049] Based on the above embodiments:
[0050] Please refer to Figure 2 , Figure 2 A schematic diagram of a surge protection circuit provided in this application.
[0051] Please refer to Figure 3 , Figure 3 A circuit schematic diagram of a common-mode filtering unit provided in this application.
[0052] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of an electrostatic protection unit provided in this application.
[0053] As a preferred embodiment, a surge protection circuit further includes a signal processing module 8;
[0054] The signal processing module 8 is electrically connected to the CAN transceiver module 3 .
[0055] As a preferred embodiment, the signal processing module 8 includes a common mode filtering unit 81 and an electrostatic protection unit 82;
[0056] The common mode filter unit 81 is electrically connected to the CAN transceiver module 3 , and the electrostatic protection unit 82 is electrically connected to the common mode filter unit 81 .
[0057] Specifically, in this embodiment, the common mode filtering unit 81 is implemented by a common mode filter, and is used for filtering the CAN communication signal of the CAN transceiver module 3; the electrostatic protection unit 82 is implemented by an electrostatic suppression diode, and is used for implementing electrostatic protection of the CAN communication signal of the CAN transceiver module 3. Therefore, the utility model has high reliability.
[0058] Please refer to Figure 5 , Figure 5 A circuit schematic diagram of a USB to CAN bus control module provided in this application.
[0059] Specifically, in this embodiment, the chip model of the USB to CAN bus control module is set to F81604. In another preferred embodiment, the chip model of the USB to CAN bus control module is not specifically limited.
[0060] Please refer to Figure 6 , Figure 6 A circuit schematic diagram of a CAN transceiver module provided in this application.
[0061] Specifically, in this embodiment, the chip model of the CAN transceiver module is set to NSi 1050DDBR. In another preferred embodiment, the chip model of the CAN transceiver module is not specifically limited.
[0062] Please refer to Figure 7 , Figure 7 A circuit schematic diagram of a switch control module provided in this application.
[0063] As a preferred embodiment, a surge protection circuit further includes a switch control module 9;
[0064] The switch control module 9 is electrically connected to the main control module 1 , the power module 2 and the IO expansion module 5 respectively.
[0065] Specifically, the switch control module 9 is disposed between the main control module 1 and the IO expansion module 5 , and is used to implement the main control module 1 to enable the working switch of the IO expansion module 5 .
[0066] Please refer to Figure 8 , Figure 8 A circuit schematic diagram of an IO expansion module provided in this application.
[0067] Specifically, in this embodiment, the chip model of the IO expansion module is set to TCA9555PWR. In another preferred embodiment, the chip model of the IO expansion module is not specifically limited.
[0068] Please refer to Fig. 9 , Fig. 9 A circuit schematic diagram of an input isolation module provided in this application.
[0069] As a preferred embodiment, the input isolation module 6 includes a first input isolation unit 61;
[0070] The first input isolation unit is electrically connected to the IO expansion module 5 and the output isolation module 7 respectively.
[0071] As a preferred embodiment, the input isolation module 6 further includes a second input isolation unit;
[0072] The second input isolation unit is electrically connected to the IO expansion module 5 and the output isolation module 7 respectively.
[0073] It is worth noting that in the present application, the input isolation module 6 also includes a third input isolation unit, a fourth input isolation unit, etc. Each input signal port is matched with an input isolation unit, and the number of input isolation units and the number of input signal ports can be set as needed, and are not specifically limited here.
[0074] As a preferred embodiment, the first input isolation unit 61 includes a first static electronic unit 611 and a first input isolation sub-unit 612;
[0075] The first input isolation sub-unit 611 is electrically connected to the IO expansion module 5 , the power module 2 and the first electrostatic sub-unit 611 , respectively. The first electrostatic sub-unit is electrically connected to the power module 2 and the output isolation module 7 , respectively.
[0076] Specifically, the first electrostatic subunit 611 is used to implement electrostatic protection of signal input to ensure the reliability of signal input; the first input isolation subunit 612 is set as an optical coupler isolator, model LTV354T. It can be understood that the first input isolation subunit 612 is used to implement photoelectric isolation between input and output signals, isolate interference, and enhance protection.
[0077] Please refer to Fig.10 , Fig.10 A circuit schematic diagram of an output isolation module provided in this application.
[0078] As a preferred embodiment, the output isolation module 7 includes a first output isolation unit 71;
[0079] The first output isolation unit is electrically connected to the power module 2 , the input isolation module 6 and the output load respectively.
[0080] It is worth noting that in the present application, the output isolation module 7 also includes a second output isolation unit, a third output isolation unit, etc. Each output signal port is matched with an output isolation unit, and the number of output isolation units and the number of output signal ports can be set as needed, and are not specifically limited here.
[0081] As a preferred embodiment, the first output isolation unit 71 includes a first switch sub-unit 711 and a first output isolation sub-unit 712;
[0082] The first output isolation sub-unit 712 is electrically connected to the power module 2 , the first switch sub-unit 711 and the output load respectively, and the first switch sub-unit 711 is electrically connected to the input isolation module 6 .
[0083] Specifically, the first switch subunit 711 is used to realize the switch control of the output signal to ensure the controllability of the signal output; the first output isolation subunit 712 is set as an optical coupler isolator, model EL357NG. It can be understood that the first output isolation subunit 712 is used to realize the photoelectric isolation between the input and output signals, isolate interference, and enhance protection.
[0084] Therefore, in the present application, the input signal and the output signal are physically isolated by an optical coupler, thereby effectively eliminating interference.
[0085] The present application also provides a signal input and output device, including a surge protection circuit.
[0086] For an introduction to a surge protection circuit provided in the present application, please refer to the above-mentioned embodiment, and the present application will not go into details here.
[0087] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.
[0088] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A surge protection circuit, characterized in that: Including main control module, power module, CAN transceiver module, USB to CAN bus control module, IO expansion module, input isolation module and output isolation module; The power supply module is electrically connected to the main control module, the CAN transceiver module, the USB to CAN bus control module, the IO expansion module, the input isolation module and the output isolation module respectively; The USB to CAN bus control module is electrically connected to the CAN transceiver module, the CAN transceiver module is electrically connected to the main control module, and the host computer is electrically connected to the USB to CAN bus control module; The main control module is electrically connected to the IO expansion module, the IO expansion module is electrically connected to the input isolation module, the input isolation module is electrically connected to the output isolation module, and the output isolation module is electrically connected to the output load.
2. A surge protection circuit according to claim 1, characterized in that: The surge protection circuit further includes a signal processing module; The signal processing module is electrically connected to the CAN transceiver module.
3. A surge protection circuit according to claim 2, characterized in that: The signal processing module includes a common mode filtering unit and an electrostatic protection unit; The common mode filtering unit is electrically connected to the CAN transceiver module, and the electrostatic protection unit is electrically connected to the common mode filtering unit.
4. A surge protection circuit according to claim 1, characterized in that: The surge protection circuit further includes a switch control module; The switch control module is electrically connected to the main control module, the power module and the IO expansion module respectively.
5. A surge protection circuit according to claim 1, characterized in that: The input isolation module comprises a first input isolation unit; The first input isolation unit is electrically connected to the IO expansion module and the output isolation module respectively.
6. A surge protection circuit according to claim 5, characterized in that: The first input isolation unit includes a first static electronic unit and a first input isolation subunit; The first input isolation sub-unit is electrically connected to the IO expansion module, the power module and the first static sub-unit respectively, and the first static sub-unit is electrically connected to the power module and the output isolation module respectively.
7. A surge protection circuit according to claim 5, characterized in that: The input isolation module also includes a second input isolation unit; The second input isolation unit is electrically connected to the IO expansion module and the output isolation module respectively.
8. A surge protection circuit according to claim 1, characterized in that: The output isolation module comprises a first output isolation unit; The first output isolation unit is electrically connected to the power module, the input isolation module and the output load respectively.
9. A surge protection circuit according to claim 8, characterized in that: The first output isolation unit includes a first switch sub-unit and a first output isolation sub-unit; The first output isolation sub-unit is electrically connected to the power module, the first switch sub-unit and the output load respectively, and the first switch sub-unit is electrically connected to the input isolation module.
10. A signal input and output device, characterized in that: A surge protection circuit comprising any one of claims 1 to 9.