Edge gateway

Abstract

The utility model discloses an edge gateway, which comprises a processor and a switching power supply module, and the switching power supply module is electrically connected with the processor. The switching power supply module comprises a switching power supply output circuit, the switching power supply output circuit comprises a protection circuit, the protection circuit comprises a voltage stabilizing diode, a silicon controlled rectifier, a first resistor, a second resistor and a third capacitor, the anode of the silicon controlled rectifier is connected with the anode of the output end of the processor, and the cathode of the silicon controlled rectifier is connected with the grounding end; two ends of the first resistor are respectively connected with a control electrode of the silicon controlled rectifier and an anode of the Zener diode, two ends of the second resistor are respectively connected with the anode of the Zener diode and a grounding end, a cathode of the Zener diode is connected with an output end anode of the processor, and two ends of the third capacitor are respectively connected with a cathode of the silicon controlled rectifier and a control electrode of the silicon controlled rectifier. Under the conditions of high current and high voltage, the voltage stabilizing diode and the silicon controlled rectifier of the protection circuit can quickly disconnect the power supply output circuit, overvoltage protection is carried out on the edge gateway, and the explosion-proof effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gateway, in particular to an edge gateway. BACKGROUND

[0002] The edge gateway is a gateway deployed at the edge of the network, which connects the physical and digital world through network connection, protocol conversion and other functions, and provides lightweight connection management, real-time data analysis and application management functions.

[0003] When the edge gateway works in the coal, oil, chemical, shipbuilding, textile and other industries, it often faces the environment where explosive gas exists. The edge gateway used in these environments needs to take certain protective measures to ensure the normal operation of the equipment in the dangerous environment. Relevant statistics show that about 70% of the circuits that fail are caused by power supply failure. Therefore, the edge gateway needs to quickly disconnect the transmission circuit under high current and high voltage conditions to avoid high energy igniting combustible gas and dust in the surrounding environment, thereby playing a role in explosion protection. SUMMARY

[0004] In order to solve the problems of the prior art, the purpose of the present application is to provide an edge gateway which can quickly disconnect the transmission circuit under high current and high voltage conditions to avoid high energy igniting combustible gas and dust in the surrounding environment, thereby playing a role in explosion protection.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] An edge gateway comprises a processor and a switching power supply module, the switching power supply module is electrically connected with the processor to supply power to the processor; the switching power supply module comprises a switching power supply output circuit, the switching power supply output circuit comprises a protection circuit, the protection circuit comprises a zener diode, a silicon controlled rectifier, a first resistor, a second resistor and a third capacitor, the anode of the silicon controlled rectifier is connected with the positive output terminal of the processor, the cathode of the silicon controlled rectifier is connected with the ground terminal, the two ends of the first resistor are connected with the control electrode of the silicon controlled rectifier and the anode of the zener diode respectively, the two ends of the second resistor are connected with the anode of the zener diode and the ground terminal respectively, the cathode of the zener diode is connected with the positive output terminal of the processor, and the two ends of the third capacitor are connected with the cathode of the silicon controlled rectifier and the control electrode of the silicon controlled rectifier respectively.

[0007] As a preferred technical scheme, the switching power supply output circuit comprises at least two protection circuits, and the at least two protection circuits are connected in parallel between the positive output terminal of the processor and the ground terminal.

[0008] As a preferred technical solution, the switching power supply output circuit comprises a first protection circuit and a second protection circuit; the first protection circuit comprises a stabilizing diode D2, a thyristor D3, a first resistor R3, a second resistor R5 and a third capacitor C3, the anode of the thyristor D3 is connected with the positive pole of the output end of the processor, the cathode of the thyristor D3 is connected with the ground end, the two ends of the first resistor R3 are connected with the control electrode of the thyristor D3 and the anode of the stabilizing diode D2 respectively, the two ends of the second resistor R5 are connected with the anode of the stabilizing diode D2 and the ground end respectively, the cathode of the stabilizing diode D2 is connected with the positive pole of the output end of the processor, and the two ends of the third capacitor C3 are connected with the cathode of the thyristor D3 and the control electrode of the thyristor D3 respectively; the second protection circuit comprises a stabilizing diode D4, a thyristor D9, a first resistor R9, a second resistor R10 and a third capacitor C9, the anode of the thyristor D9 is connected with the positive pole of the output end of the processor, the cathode of the thyristor D9 is connected with the ground end, the two ends of the first resistor R9 are connected with the control electrode of the thyristor D9 and the anode of the stabilizing diode D4 respectively, the two ends of the second resistor R10 are connected with the anode of the stabilizing diode D4 and the ground end respectively, the cathode of the stabilizing diode D4 is connected with the positive pole of the output end of the processor, and the two ends of the third capacitor C9 are connected with the cathode of the thyristor D9 and the control electrode of the thyristor D9 respectively.

[0009] As a preferred technical solution, the switching power supply module further comprises a power input circuit, the power input circuit comprises a power anti-reverse connection unit, a filter unit, an overvoltage protection unit and a power conversion module connected in sequence, the power anti-reverse connection unit is connected in series at the positive pole of the power supply, one end of the filter unit is connected with the power anti-reverse connection unit, the other end of the filter unit is connected with the ground end, the overvoltage protection unit is connected in parallel at the two ends of the filter unit, the input end of the power conversion module is connected with the overvoltage protection unit, and the output end of the power conversion module is connected with the input end of the processor.

[0010] As a preferred technical solution, the power anti-reverse connection unit comprises a first diode D7 and a second diode D1, the anode of the first diode D7 is connected with the positive pole of the power supply, and the cathode of the first diode D7 is connected with the anode of the second diode D1, the filter unit comprises a first capacitor C1 and a second capacitor C2, the two ends of the first capacitor C1 are connected with the cathode of the second diode D1 and the ground end respectively, the two ends of the second capacitor C2 are connected with the two ends of the first capacitor C1 respectively, and the overvoltage protection unit comprises a transient voltage suppression diode TVS1, the two ends of the transient voltage suppression diode TVS1 are connected with the two ends of the second capacitor C2 respectively.

[0011] As a preferred technical solution, the edge gateway further comprises a switch and a wireless communication module, the switch comprises a first switch and a second switch, the first switch is in communication connection with the processor, the processor communicates with the outside through the first switch, the second switch is in communication connection with the processor, and the wireless communication module is in communication connection with the second switch, the processor communicates with the outside through the second switch and the wireless communication module.

[0012] As a preferred technical solution, the wireless communication module comprises a WiFi module and a Zigbee module, and the WiFi module and the Zigbee module are in communication connection with the second switch respectively.

[0013] Compared with the prior art, the application has the beneficial effects that:

[0014] The edge gateway provided by the application has the power output circuit of the switching power supply module with the protection circuit, and in the case of high current and high voltage, the voltage stabilizing diode and the thyristor of the protection circuit can quickly disconnect the power output circuit, so that the overvoltage protection of the edge gateway is realized, the combustible gas and dust in the surrounding environment are prevented from being ignited by high energy, and the explosion-proof effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of an edge gateway provided by an embodiment of the application;

[0016] Figure 2 is a circuit diagram of a power input circuit of a switching power supply module provided by an embodiment of the application;

[0017] Figure 3 is a circuit diagram of a power output circuit of a switching power supply module provided by an embodiment of the application.

[0018] Wherein, 100, edge gateway; 11, processor; 12, switching power supply module; 131, first switch; 132, second switch; 14, wireless communication module; 15, watchdog circuit. DETAILED DESCRIPTION

[0019] The application will be described in detail below with reference to the specific embodiments shown in the drawings, but these embodiments do not limit the application, and the changes in structure, method or function made by those skilled in the art based on these embodiments are all included in the protection scope of the application.

[0020] As Figure 1 shown, the application provides an edge gateway 100, which comprises a processor 11, a switching power supply module 12, a switch, a wireless communication module 14 and a watchdog circuit 15.

[0021] The processor 11 ensures that the edge gateway 100 can efficiently handle various tasks, including network connection, protocol conversion, real-time data analysis, etc. In the present application, the processor 11 adopts an ARM core board with a model number of AM3354, which can be easily purchased in the market.

[0022] The switching power supply module 12 is electrically connected with the processor 11. The switching power supply module 12 provides a stable working voltage for the edge gateway 100, and prevents the explosion of flammable and explosive gases in the surrounding environment when the edge gateway 100 occurs open circuit or short circuit failure. The switching power supply module 12 includes a power input circuit and a power output circuit.

[0023] The switch includes a first switch 131 and a second switch 132. The first switch 131 is in communication connection with the processor 11, and the processor 11 realizes the external wired communication function through the first switch 131. The second switch 132 is in communication connection with the processor 11, and the wireless communication module 14 is in communication connection with the second switch 132. The second switch 132 provides optical-electric signal forwarding between the wireless communication module 14 and the processor 11, and the processor 11 realizes the external wireless communication function through the second switch 132 and the wireless communication module 14. In the present application, the first switch 131 adopts a 3-electric 2-optical switch produced by Shenzhen Sanwang Communication Technology Co., Ltd.; and the second switch 132 adopts a 5-port switch.

[0024] In the present application, the wireless communication module 14 includes a WiFi module and a Zigbee module, and the WiFi module and the Zigbee module are respectively in communication connection with the second switch 132. The Zigbee module is well-known for its small data transmission, low power consumption and excellent stability, and is particularly suitable for industrial applications. For the needs of efficient and stable connection, it is an ideal choice. On the other hand, although the WiFi module supports larger data transmission, its short-distance connection and relatively low stability are more suitable for home and commercial environments, and are more common for daily data transmission and network connection.

[0025] The watchdog circuit 15 is in electrical connection with the processor 11. The watchdog circuit 15 monitors the running state of the edge gateway 100, and automatically triggers the edge gateway 100 to restart when the edge gateway 100 fails, to ensure the normal operation of the edge gateway 100. The watchdog circuit 15 is a prior art, and will not be described herein.

[0026] As shown in FIG. 1, the edge gateway 100 includes a processor 11, a switching power supply module 12, a switch, a wireless communication module 14 and a watchdog circuit 15. Figure 2As shown, the power input circuit includes a reverse polarity protection unit, a filtering unit, an overvoltage protection unit, and a power conversion module connected in sequence. The reverse polarity protection unit is connected in series with the positive terminal of the power supply to prevent reverse polarity. One end of the filtering unit is connected to the reverse polarity protection unit, and the other end is connected to the ground terminal to effectively filter out interference from the input signal. The overvoltage protection unit is connected in parallel across the filtering unit to provide overvoltage protection for the device. The input terminal of the power conversion module is connected to the overvoltage protection unit, and the output terminal of the power conversion module is connected to the processor 11. The power conversion module is used for voltage conversion to input a suitable voltage to the processor 11.

[0027] In one implementation, the reverse connection protection unit includes a first diode D7 and a second diode D1. The anode of the first diode D7 is connected to the positive terminal of the power supply, and the cathode of the first diode D7 is connected to the anode of the second diode D1. The filtering unit includes a first capacitor C1 and a second capacitor C2. The two ends of the first capacitor C1 are connected to the cathode of the second diode D1 and the ground terminal, respectively. The two ends of the second capacitor C2 are connected to the two ends of the first capacitor C1, respectively. The overvoltage protection unit includes a transient voltage suppressor diode TVS1. The two ends of the transient voltage suppressor diode TVS1 are connected to the two ends of the second capacitor C2, respectively.

[0028] In this application, the first diode D7 and the second diode D1 are B530C-13-F type diodes, with a maximum operating current of 5A and a maximum reverse voltage of 21V. The highest voltage of the associated power supply is 12.5V, and the maximum voltage 12.5V × safety factor 1.5 = 18.7V, which is less than the maximum reverse voltage of 21V; the maximum current of the associated power supply is 1.5A, and the maximum current 1.5A × safety factor 1.5 = 2.25A, which is less than 5A. Therefore, the selected first diode D7 and second diode D1 meet the intrinsic safety requirements. The first capacitor C1 is a 1μF / 50V capacitor, and the second capacitor C2 is a 1nF / 50V capacitor. The transient voltage suppressor diode TVS1 is an SMDJ36CA type transient voltage suppressor diode. The power conversion module is a DC / DC power conversion module, which converts the 12V DC signal into a 5V DC signal.

[0029] like Figure 3 As shown, the power output circuit includes a protection circuit. The protection circuit includes a Zener diode, a silicon controlled rectifier (SCR), a first resistor, a second resistor, and a third capacitor. The anode of the SCR is connected to the positive terminal of the processor 11 output, and the cathode of the SCR is connected to ground. The two ends of the first resistor are connected to the control electrode of the SCR and the anode of the Zener diode, respectively. The two ends of the second resistor are connected to the anode of the Zener diode and ground, respectively. The cathode of the Zener diode is connected to the positive terminal of the processor 11 output. The two ends of the third capacitor are connected to the cathode of the SCR and the control electrode of the SCR, respectively.

[0030] When the voltage across the zener diode is broken, the voltage across the zener diode remains substantially unchanged. Thus, when the zener diode is connected to the output circuit of the power supply, if the voltage of the power supply fluctuates or the voltage at each point in the output circuit of the power supply changes due to other reasons, the voltage across the load will remain substantially unchanged. The thyristor is also called a silicon controlled rectifier. When a forward voltage is applied between the anode and the cathode of the thyristor, if the voltage of the control electrode of the thyristor is zero, the thyristor is cut off. However, when a power source is applied between the cathode and the control electrode of the thyristor, the thyristor is turned on. When the thyristor is turned on, the control electrode power source is removed, and the thyristor remains in the on state. Therefore, when the charging voltage across the third capacitor is too high, the thyristor will be triggered to turn on and quickly disconnect the output circuit of the power supply.

[0031] In summary, in the case of high current and high voltage, the zener diode and the thyristor of the protection circuit can quickly disconnect the output circuit of the power supply, protect the edge gateway 100 from overvoltage, and avoid igniting the combustible gas and dust in the surrounding environment with high energy, thereby playing a role in explosion prevention.

[0032] As an implementation manner, the switching power supply output circuit includes at least two protection circuits connected in parallel between the positive output terminal of the processor 11 and the ground terminal. When one or more protection circuits fail, the other protection circuits play a protective role for the edge gateway 100.

[0033] In this application, the switching power supply output circuit includes a first protection circuit and a second protection circuit. The first protection circuit includes a zener diode D2, a thyristor D3, a first resistor R3, a second resistor R5, and a third capacitor C3. The anode of the thyristor D3 is connected to the positive output terminal of the processor 11, and the cathode of the thyristor D3 is connected to the ground terminal. The two ends of the first resistor R3 are respectively connected to the control electrode of the thyristor D3 and the anode of the zener diode D2. The two ends of the second resistor R5 are respectively connected to the anode of the zener diode D2 and the ground terminal. The cathode of the zener diode D2 is connected to the positive output terminal of the processor 11. The two ends of the third capacitor C3 are respectively connected to the cathode of the thyristor D3 and the control electrode of the thyristor D3. The second protection circuit includes a zener diode D4, a thyristor D9, a first resistor R9, a second resistor R10, and a third capacitor C9. The anode of the thyristor D9 is connected to the positive output terminal of the processor 11, and the cathode of the thyristor D9 is connected to the ground terminal. The two ends of the first resistor R9 are respectively connected to the control electrode of the thyristor D9 and the anode of the zener diode D4. The two ends of the second resistor R10 are respectively connected to the anode of the zener diode D4 and the ground terminal. The cathode of the zener diode D4 is connected to the positive output terminal of the processor 11. The two ends of the third capacitor C9 are respectively connected to the cathode of the thyristor D9 and the control electrode of the thyristor D9.

[0034] The steady voltage diode D2, D4 is selected from the type ZMM5V1, the steady voltage of which is 5.1V, the power is 1W, and the stable voltage is 4.8V-5.4V. When the highest input voltage 12.5V is applied to the steady voltage diode, the conduction current of the second resistance short circuit is U÷R=(12.5V-4.8V)÷10KΩ=0.77mA, and the conduction current of the thyristor control electrode is 15mA, so the power of the steady voltage diode is U×I=5.4V×(0.77+15)mA×safety factor 1.5=0.128W<the rated power of the steady voltage diode 0.5W, and the selected steady voltage diode meets the intrinsic safety requirement. The thyristors D3, D9 are selected from the type JCT151K-800R, the rated current of which is 12A, and the working voltage is 800V. The highest voltage input in the circuit is 12.5V, the maximum short circuit current is 1.5A, and the maximum short circuit current is 1.5A×safety factor 1.5=2.25A<the rated current of the thyristor 12A, and the selected thyristor meets the intrinsic safety requirement.

[0035] The resistance value of the first resistance R3, R9 is 100Ω. The resistance value of the second resistance R5, R10 is 10KΩ.

[0036] The third capacitor C9 is of the specification 100nF / 50V.

[0037] It should be noted that the "first", "second", and similar words used in the specification and claims of the present application do not represent any order, quantity, or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not represent a quantity limitation, but represent the existence of at least one. "Multiple" or "several" means at least two. Unless otherwise indicated, "before", "after", "left", "right", "below", and / or "above" and similar words are only for convenience of explanation, and are not limited to a position or spatial orientation. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect.

[0038] The singular forms "a", "said" and "the" used in the specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein means and includes any or all possible combinations of one or more associated listed items.

[0039] It should be understood that all the modifications and variations can be made according to the above description by those skilled in the art, and all these modifications and variations shall belong to the protection scope of the claims attached to the present application.

Claims

1. An edge gateway, comprising: processor; A switching power supply module, which is electrically connected to the processor to supply power to the processor; Its features are, The switching power supply module includes a switching power supply output circuit, which includes a protection circuit. The protection circuit includes a Zener diode, a thyristor, a first resistor, a second resistor, and a third capacitor. The anode of the thyristor is connected to the positive output terminal of the processor, and the cathode of the thyristor is connected to ground. The two ends of the first resistor are respectively connected to the control electrode of the thyristor and the anode of the Zener diode. The two ends of the second resistor are respectively connected to the anode of the Zener diode and ground. The cathode of the Zener diode is connected to the positive output terminal of the processor. The two ends of the third capacitor are respectively connected to the cathode of the thyristor and the control electrode of the thyristor.

2. The edge gateway as described in claim 1, characterized in that, The switching power supply output circuit includes at least two of the protection circuits, and the at least two protection circuits are connected in parallel between the positive terminal of the processor's output and the ground terminal.

3. The edge gateway as described in claim 1 or 2, characterized in that, The switching power supply output circuit includes a first protection circuit and a second protection circuit. The first protection circuit includes a Zener diode D2, a silicon controlled rectifier (SCR) D3, a first resistor R3, a second resistor R5, and a third capacitor C3. The anode of the SCR D3 is connected to the positive terminal of the processor output, and the cathode of the SCR D3 is connected to the ground terminal. The two ends of the first resistor R3 are respectively connected to the control electrode of the SCR D3 and the anode of the Zener diode D2. The two ends of the second resistor R5 are respectively connected to the anode of the Zener diode D2 and the ground terminal. The cathode of the Zener diode D2 is connected to the positive terminal of the processor output. The two ends of the third capacitor C3 are respectively connected to the cathode of the SCR D3 and the control electrode of the SCR D3. The second protection circuit includes a Zener diode D4, a silicon controlled rectifier (SCR) D9, a first resistor R9, a second resistor R10, and a third capacitor C9. The anode of the SCR D9 is connected to the positive terminal of the processor output, and the cathode of the SCR D9 is connected to the ground terminal. The two ends of the first resistor R9 are connected to the control electrode of the SCR D9 and the anode of the Zener diode D4, respectively. The two ends of the second resistor R10 are connected to the anode of the Zener diode D4 and the ground terminal, respectively. The cathode of the Zener diode D4 is connected to the positive terminal of the processor output. The two ends of the third capacitor C9 are connected to the cathode of the SCR D9 and the control electrode of the SCR D9, respectively.

4. The edge gateway as described in claim 1, characterized in that, The switching power supply module further includes a power input circuit, which comprises a reverse connection protection unit, a filtering unit, an overvoltage protection unit, and a power conversion module connected in sequence. The reverse connection protection unit is connected in series with the positive terminal of the power supply. One end of the filtering unit is connected to the reverse connection protection unit, and the other end of the filtering unit is connected to the ground terminal. The overvoltage protection unit is connected in parallel across the filtering unit. The input terminal of the power conversion module is connected to the overvoltage protection unit, and the output terminal of the power conversion module is connected to the input terminal of the processor.

5. The edge gateway as described in claim 4, characterized in that, The reverse connection protection unit includes a first diode D7 and a second diode D1. The anode of the first diode D7 is connected to the positive terminal of the power supply, and the cathode of the first diode D7 is connected to the anode of the second diode D1. The filtering unit includes a first capacitor C1 and a second capacitor C2. The two ends of the first capacitor C1 are connected to the cathode of the second diode D1 and the ground terminal, respectively. The two ends of the second capacitor C2 are connected to the two ends of the first capacitor C1, respectively. The overvoltage protection unit includes a transient voltage suppression diode TVS1. The two ends of the transient voltage suppression diode TVS1 are connected to the two ends of the second capacitor C2, respectively.

6. The edge gateway as described in claim 1, characterized in that, The edge gateway further includes a switch and a wireless communication module. The switch includes a first switch and a second switch. The first switch is communicatively connected to the processor, and the processor communicates externally via the first switch through wired communication. The second switch is communicatively connected to the processor, and the wireless communication module is communicatively connected to the second switch, and the processor communicates externally wirelessly via the second switch and the wireless communication module.

7. The edge gateway as described in claim 6, characterized in that, The wireless communication module includes a WiFi module and a Zigbee module, and the WiFi module and the Zigbee module are respectively connected to the second switch for communication.

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