Isolation signal transmission system based on optocoupler

Abstract

The utility model relates to the field of information safety transmission, in particular to an isolation signal transmission system based on an optocoupler. The isolation signal transmission system based on the optocoupler comprises a first optocoupler signal transmission system and a second optocoupler signal transmission system. The first optocoupler signal transmission system and the second optocoupler signal transmission system are provided with optocoupler signal transmission circuits with the same number; and each optocoupler signal transmission circuit is used for transmitting 1 bit of data in one signal transmission process. According to the utility model, photoelectric isolation signal transmission of complete physical isolation of internal and external networks can be realized, and a series of problems of high cost, large power consumption, noise, poor stability and short service life existing in relay control signal transmission are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of information security transmission, and in particular to an isolated signal transmission system based on optical couplers. Background Technology

[0002] Due to information security requirements, data transmission between internal and external networks must employ complete physical isolation. Currently, binary 0 and 1 data transmission can be achieved through relay systems controlling signal transmission, thus realizing complete physical isolation between internal and external networks.

[0003] Because data transmission that achieves complete physical isolation between internal and external networks through relay system control signal transmission is costly, consumes a lot of power, is noisy, has poor stability, and has a short service life, there is a need to develop a low-cost, environmentally friendly, and energy-saving alternative to the relay control system. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides an isolation signal transmission system based on optical coupler.

[0005] This invention provides an optical coupler-based isolated signal transmission system, which includes a first optical coupler signal transmission system and a second optical coupler signal transmission system. The first and second optical coupler signal transmission systems are provided with the same number of optical coupler signal transmission circuits. Each optical coupler signal transmission circuit is used to transmit 1 bit of data in one signal transmission process.

[0006] Optionally, the optocoupler signal transmission circuit includes an optocoupler, a control unit disposed at the signal input end of the optocoupler, and a receiving unit disposed at the signal output end of the optocoupler.

[0007] Optionally, the control unit includes a protection module disposed on the first pin of the optocoupler and a control signal indication module disposed on the second pin of the optocoupler.

[0008] Optionally, the protection module consists of a first resistor; the control signal indication module includes a second resistor and a light-emitting diode connected in series.

[0009] Optionally, the resistance value of the first resistor is in the range of 220 to 680 ohms; the resistance value of the second resistor is in the range of 560 to 2700 ohms.

[0010] Optionally, the receiving unit is provided with a signal transmission speed control module.

[0011] Optionally, the signal transmission speed control module is composed of an RC circuit.

[0012] Optionally, the RC circuit includes a third resistor disposed at the fourth pin of the optocoupler and a capacitor disposed between the third and fourth pins of the optocoupler; the resistance value of the third resistor is in the range of 50K to 1M ohms, and the value of the capacitor is in the range of 0.1uF to 22uF.

[0013] Optionally, the values ​​of the third resistor and the capacitor are used to control the signal transmission speed.

[0014] Optionally, the optocoupler signal transmission circuit may be one or more; 1 bit of data may be a high-level signal or a low-level signal.

[0015] The first optical coupler signal transmission system and the second optical coupler signal transmission system serve as the control terminal and receiving terminal of the optical coupler-based isolated signal transmission system, respectively; or,

[0016] The first optical coupler signal transmission system and the second optical coupler signal transmission system serve as the receiving end and the control end of the optical coupler-based isolated signal transmission system, respectively.

[0017] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art:

[0018] The optocoupler-based isolated signal transmission system provided by this utility model includes a first optocoupler signal transmission system and a second optocoupler signal transmission system. Both systems have the same number of optocoupler signal transmission circuits. In a single signal transmission process, each optocoupler circuit can transmit 1 bit of data. This allows the first optocoupler signal transmission system to be deployed on the internal network, outputting high and low level control signals, while the second system is deployed on the external network to receive a high or low level signal, enabling the transmission of a 0 or 1 signal, thus achieving bidirectional information interaction between the internal and external networks. Furthermore, this utility model embodiment uses optocouplers (i.e., optocoupler devices) to achieve isolated signal transmission, enabling completely physically isolated optocoupler-isolated signal command transmission between the internal and external networks. This effectively solves a series of problems associated with relay control signal transmission, such as high cost, high power consumption, noise, poor stability, and short service life. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 Circuit diagrams of the optocoupler-based isolated signal transmission system provided for various embodiments of this utility model;

[0022] Figure 2 The schematic diagram of the optocoupler signal transmission circuit provided for various embodiments of this utility model. Detailed Implementation

[0023] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0024] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0025] Example 1

[0026] This utility model provides an isolated signal transmission system based on an optical coupler, such as... Figure 1 As shown, the optocoupler-based isolated signal transmission system includes a first optocoupler signal transmission system (e.g., MOSI) and a second optocoupler signal transmission system (e.g., MISO); the first optocoupler signal transmission system and the second optocoupler signal transmission system are provided with the same number of optocoupler signal transmission circuits; each optocoupler signal transmission circuit is used to transmit 1 bit of data in one signal transmission process.

[0027] There are one or more optocoupler signal transmission circuits; 1 bit of data is a high-level or low-level signal. Each signal can constitute an instruction.

[0028] A high-level signal is represented by a binary 1, and a low-level signal is represented by a binary 0. The optocoupler-based isolated signal transmission system provided in this embodiment includes a first optocoupler signal transmission system and a second optocoupler signal transmission system. Both systems have the same number of optocoupler signal transmission circuits. In a single signal transmission process, each optocoupler signal transmission circuit can transmit 1 bit of data. Thus, the first optocoupler signal transmission system can be deployed on the internal network to output high and low level control signals, while the second system can be deployed on the external network to receive a high or low level signal, achieving signal 0 or 1 transmission. Alternatively, the systems can be deployed in reverse to achieve bidirectional information exchange between the internal and external networks.

[0029] In addition, this utility model embodiment is based on optocouplers (i.e., optocoupler devices) to realize isolated signal transmission, which can realize optocoupler-isolated signal command transmission with complete physical isolation between internal and external networks, effectively solving a series of problems in relay control signal transmission, such as high cost, high power consumption, noise, poor stability and short service life.

[0030] In some embodiments, the first optical coupler signal transmission system and the second optical coupler signal transmission system serve as the control end and the receiving end of the optical coupler-based isolated signal transmission system, respectively; or, the first optical coupler signal transmission system and the second optical coupler signal transmission system serve as the receiving end and the control end of the optical coupler-based isolated signal transmission system, respectively. This enables bidirectional signal transmission between the internal and external networks.

[0031] Reference Figure 1 As shown, the optocoupler-based isolated signal transmission system includes a set of MOSI and a set of MISO to achieve bidirectional signal transmission between the internal and external networks. Specifically, the MOSI is located on the external network as the control terminal, and the MISO is located on the internal network as the receiving terminal; conversely, the MISO is located on the external network as the receiving terminal and on the internal network as the control terminal. Both the MOSI and MISO groups consist of multiple optocoupler signal transmission circuits, and the specific number of circuits can be set according to system requirements to achieve the transmission of multiple status data.

[0032] In practical implementation, if an 8-bit isolated signal transmission between internal and external networks is required, the first and second optocoupler signal transmission systems can be configured with eight optocoupler signal transmission circuits. These circuits can be combined to transmit 2^8 different signals (commands).

[0033] In some embodiments, the optocoupler signal transmission circuit includes an optocoupler OC1, a control unit Ctrl disposed at the signal input terminal of the optocoupler, and a receiving unit Sign disposed at the signal output terminal of the optocoupler. Optionally, the control unit includes a protection module disposed at a first pin 1 of the optocoupler OC1 and a control signal indication module disposed at a second pin 2 of the optocoupler OC1. The receiving unit is provided with a signal transmission speed control module.

[0034] For example, the protection module consists of a first resistor R1; the control signal indication module includes a second resistor R2 connected in series and a light-emitting diode LED1.

[0035] The signal transmission speed control module is composed of an RC circuit. The RC circuit includes a third resistor R3 located at pin 4 of the optocoupler and a capacitor C1 located between pins 3 and 4 of the optocoupler. Thus, by changing the parameters of the RC circuit at the receiving end, the physical controllability of the transmission speed can be achieved, enabling signal interaction between internal and external networks with limited transmission speed.

[0036] Based on the above embodiments, a specific embodiment is provided, with reference to... Figure 2 As shown, the optocoupler signal transmission circuit includes resistors R1, R2, and R3, as well as a light-emitting diode LED1, an optocoupler OC1, and a capacitor C1. Among these,

[0037] Resistor R1 serves as a protection module for current limiting, protecting the optocoupler's transmitter and preventing damage from overcurrent or overvoltage. Typically, with an input signal voltage of 3.3V, R1 can be selected within the range of 220 to 680 ohms, depending on the drive circuit of the optocoupler's control terminal.

[0038] Resistor R2 and LED1 serve as a control signal indicator module, displaying the current signal transmission status for easy observation. Typically, resistor R2 can be selected from 560 to 2700 ohms, depending on the color of the selected LED.

[0039] The OC1 optocoupler serves as the core component of the isolated signal transmission system, enabling completely physically isolated signal transmission.

[0040] The values ​​of the third resistor R3 and capacitor C1 are used to control the signal transmission speed. Specifically, the RC circuit limits the transmission speed, which can be achieved by changing the parameters of resistor R and capacitor C1. The pull-up speed of the receiving unit's Sign level can be controlled using resistor R3 and capacitor C1. For example, when the capacitor is charging, the more energy it contains, the higher the voltage becomes, and it can only be recognized as a high level after reaching the CMOS high-level threshold. The value of resistor R directly determines the current; a larger current results in faster charging, and a smaller current results in slower charging, thus taking longer to reach the CMOS high-level threshold, thereby controlling the signal transmission speed of the entire system.

[0041] The optocoupler-based isolated signal transmission system provided in the various embodiments of this utility model can realize bidirectional information interaction between internal and external networks, achieving low cost, low power consumption, no noise, high stability, and long service life.

[0042] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0043] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0044] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. An optically coupled isolated signal transmission system, characterized in that, The optocoupler-based isolated signal transmission system includes a first optocoupler signal transmission system and a second optocoupler signal transmission system; the first optocoupler signal transmission system and the second optocoupler signal transmission system are provided with the same number of optocoupler signal transmission circuits; each optocoupler signal transmission circuit is used to transmit 1 bit of data in one signal transmission process.

2. The optocoupler-based isolated signal transmission system according to claim 1, characterized in that, The optocoupler signal transmission circuit includes an optocoupler, a control unit disposed at the signal input end of the optocoupler, and a receiving unit disposed at the signal output end of the optocoupler.

3. The optocoupler-based isolated signal transmission system according to claim 2, characterized in that, The control unit includes a protection module disposed on the first pin of the optocoupler and a control signal indication module disposed on the second pin of the optocoupler.

4. The optocoupler-based isolated signal transmission system according to claim 3, characterized in that, The protection module consists of a first resistor; the control signal indication module includes a second resistor and a light-emitting diode connected in series.

5. The optocoupler-based isolated signal transmission system according to claim 4, characterized in that, The resistance value of the first resistor is in the range of 220 to 680 ohms; the resistance value of the second resistor is in the range of 560 to 2700 ohms.

6. The optocoupler-based isolated signal transmission system according to any one of claims 2-5, characterized in that, The receiving unit is equipped with a signal transmission speed control module.

7. The optocoupler-based isolated signal transmission system according to claim 6, characterized in that, The signal transmission speed control module is composed of an RC circuit.

8. The optocoupler-based isolated signal transmission system according to claim 7, characterized in that, The RC circuit includes a third resistor disposed at the fourth pin of the optocoupler and a capacitor disposed between the third and fourth pins of the optocoupler; the resistance value of the third resistor ranges from 50K to 1M ohms, and the value of the capacitor ranges from 0.1uF to 22uF.

9. The optically coupled isolated signal transmission system according to claim 8, characterized in that, The values ​​of the third resistor and the capacitor are used to control the signal transmission speed.

10. The optocoupler-based isolated signal transmission system according to any one of claims 1-5, characterized in that, The optocoupler signal transmission circuit is one or more; 1 bit of data is a high-level signal or a low-level signal. The first optical coupler signal transmission system and the second optical coupler signal transmission system serve as the control terminal and receiving terminal of the optical coupler-based isolated signal transmission system, respectively; or, The first optical coupler signal transmission system and the second optical coupler signal transmission system serve as the receiving end and the control end of the optical coupler-based isolated signal transmission system, respectively.

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