Anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system

Abstract

The utility model discloses an anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system which comprises a switching power supply, an RC filter, a PLC controller, an on-site sensor, a shielding twisted-pair cable, a DC signal isolation module, a cable shielding layer, a shielding grounding device and a shielding grounding body. The RC filter is respectively connected with the field sensor and the PLC through direct current power supply, the field sensor is connected with the direct current signal isolation module through a connecting wire, the connecting wire adopts a shielded twisted pair cable, and a shielded grounding device is arranged between the field sensor and the direct current signal isolation module. According to the anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system provided by the utility model, the RC filter ensures that the power supply of the field sensor and the PLC is low in interference, and the shielding layer of the shielding twisted-pair cable is grounded at a single end, so that the analog quantity signal output to the PLC is accurate and free of interference.

Description

Technical Field

[0001] The utility model relates to the technical field of AEM electrolytic hydrogen production electrical control, in particular to an electromagnetic interference-resistant AEM electrolytic hydrogen production electrical control system. Background Technique

[0002] Hydrogen is a clean energy source, and electrolytic water hydrogen production is an efficient and clean hydrogen production technology. Currently, the main electrolytic hydrogen production processes include: alkaline electrolytic water technology, proton exchange membrane electrolytic water technology, and anion exchange membrane electrolytic water technology (AEM). Among them, the anion exchange membrane electrolytic water technology (AEM) is considered a hydrogen production technology with great development prospects due to its unique advantages of low cost and high efficiency.

[0003] Currently, the control equipment of AEM water electrolysis hydrogen production devices usually uses a PLC controller. During the operation of the hydrogen production equipment, the physical quantity values of the monitoring points are collected by on-site sensors and then converted into analog signals and transmitted to the PLC controller. Since the analog signal belongs to an electrical signal, it is easily affected by electromagnetic interference during transmission. Eventually, there is a deviation between the analog signal value received by the PLC controller and the actual physical value on-site. The system will not be able to accurately know the current state of the equipment, which may lead to unstable control or no action of the entire system, thus affecting the hydrogen production effect and safety of the system. Content of the Utility Model

[0004] The purpose of the utility model is to provide an electromagnetic interference-resistant AEM electrolytic hydrogen production electrical control system. The RC filter ensures that the power supply for the on-site sensors and the PLC controller is low-interference, which can improve their service life. The single-end grounding of the shielding layer of the shielded twisted pair cable can suppress the potential difference to eliminate the interference of electromagnetic waves on the analog signal. The DC signal isolation module can isolate the series current, electromagnetic, and harmonics mixed in the analog signal, so as to ensure that the analog signal output to the PLC controller is accurate and interference-free.

[0005] The utility model provides an electromagnetic interference-resistant AEM electrolytic hydrogen production electrical control system, including a switching power supply, an RC filter, a PLC controller, on-site sensors, shielded twisted pair cables, a DC signal isolation module, a cable shielding layer, a shielding grounding device, and a shielding grounding body. The switching power supply is connected to the RC filter. The RC filter is respectively connected to the on-site sensors and the PLC controller through DC power supply. The on-site sensors are connected to the DC signal isolation module through connection lines. The connection lines use shielded twisted pair cables. There is a shielding grounding device between the on-site sensors and the DC signal isolation module. The DC signal isolation module is connected to the PLC controller.

[0006] Preferably, the output end of the switching power supply and the RC filter are connected in series.

[0007] Preferably, a cable shielding layer is provided on the outer side of the shielded twisted pair cable.

[0008] Preferably, the on-site sensors include temperature sensors, liquid level sensors, flow sensors, pressure sensors, differential pressure sensors, and voltage sensors.

[0009] Preferably, the cable shielding layer on one side of the on-site sensor is treated with suspension.

[0010] Preferably, the on-site sensor is connected to the input end of the DC signal isolation module through a connecting wire, and the output end of the DC signal isolation module is connected to the PLC controller.

[0011] Preferably, the shielding grounding device is connected to the shielding grounding body.

[0012] Therefore, the present utility model adopts the above-mentioned anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system. The RC filter ensures that the power supply for the on-site sensor and the PLC controller has low interference, which can improve their service life. The single-end grounding of the shielded twisted pair cable shielding layer can suppress the potential difference to eliminate the interference of electromagnetic waves on the analog signal. The DC signal isolation module can isolate the series current, electromagnetic, and harmonics mixed in the analog signal, so as to ensure that the analog signal output to the PLC controller is accurate and interference-free.

[0013] Next, through the drawings and embodiments, the technical solutions of the present utility model will be further described in detail. Description of the Drawings

[0014] Figure 1 It is the overall schematic diagram of an anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system of the present utility model.

[0015] Reference Numerals

[0016] 1. Switching power supply; 2. RC filter; 3. PLC controller; 4. On-site sensor; 5. Shielded twisted pair cable; 6. DC signal isolation module; 7. Cable shielding layer; 8. Shielding grounding device; 9. Shielding grounding body. Detailed Embodiments

[0017] The technical solutions of the present utility model will be further described below through the drawings and embodiments.

[0018] Unless otherwise defined, the technical terms or scientific terms used in the present utility model should have the ordinary meaning understood by those with ordinary skills in the field to which the present utility model belongs.

[0019] In the present utility model, words such as "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Words such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0020] Embodiment 1

[0021] As Figure 1 shown, an anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system of the present utility model includes a switching power supply 1, an RC filter 2, a PLC controller 3, a field sensor 4, a shielded twisted pair cable 5, a DC signal isolation module 6, a cable shielding layer 7, a shielding grounding device 8 and a shielding grounding body 9. First, the switching power supply 1 is connected to the RC filter 2 and the output end of the switching power supply 1 and the RC filter 2 are connected in series to reduce the ripple voltage and noise in the direct current output by the switching power supply 1, ensuring that the power supply for the PLC controller 3 and the field sensor 4 is free of interference from miscellaneous waves. The RC filter 2 is respectively connected to the field sensor 4 and the PLC controller 3 through DC power supply.

[0022] The field sensor 4 is connected to the input end of the DC signal isolation module 6 through a connecting wire; the connecting wire uses a shielded twisted pair cable 5; the outside of the shielded twisted pair cable 5 is provided with a cable shielding layer 7.

[0023] The field sensor 4 includes a temperature sensor, a liquid level sensor, a flow sensor, a pressure sensor, a differential pressure sensor, and a voltage sensor.

[0024] During operation, the temperature sensor converts the monitored liquid supply temperature value into an analog signal output. During the operation of the system, the liquid level sensor converts the detected liquid supply level value into an analog signal output. During the operation of the system, the flow sensor converts the monitored liquid supply flow value into an analog signal output. During operation, the pressure sensor converts the monitored liquid supply pressure value into an analog signal output. During the operation of the system, the differential pressure sensor converts the monitored liquid supply pressure difference value into an analog signal output. During the operation of the system, the voltage sensor converts the monitored electrolytic cell voltage value into an analog signal output.

[0025] When the shielded twisted pair cable 5 is routed, it is avoided to be close to the cable with large current. A shielding grounding device is provided between the field sensor 4 and the DC signal isolation module 6.

[0026] The cable shielding layer 7 on the side of the on-site sensor 4 is suspended, and the cable shielding layer 7 on the input end side of the DC signal isolation module 6 is connected to the shielding grounding device 8. The shielding grounding device 8 is connected to the shielding grounding body 9, which can introduce the external interference signal into the ground and suppress the potential difference to eliminate the interference of electromagnetic waves on the analog signal.

[0027] The output end of the DC signal isolation module 6 is connected to the PLC controller 3; the received analog signal is isolated and converted by the DC signal isolation module 6 and output to the PLC controller 3. The DC signal isolation module 6 can isolate the cross current, electromagnetic wave, and harmonic wave mixed in the analog signal, significantly improving the quality of the analog signal. Thus, the analog signal value received by the PLC controller 3 is basically the same as the physical quantity value monitored by the on-site sensor 4.

[0028] Working principle: The on-site sensor 4 can convert the physical quantity value to be monitored during the operation of the on-site equipment into an analog signal.

[0029] Perform RC filtering on the switching power supply 1 to reduce the interference of the power supply to the on-site sensor 4; the signal connection cable of the on-site sensor 4 uses a shielded twisted pair cable 5, and the cable shielding layer 7 is connected to the ground in a single-ended manner to suppress the potential difference to eliminate electromagnetic interference; the received analog signal of the on-site sensor 4 is isolated and converted by the DC signal isolation module 6 and output to the PLC controller 3.

[0030] Therefore, the present utility model adopts the above-mentioned anti-electromagnetic interference AEM electrolytic hydrogen production electrical control system. The RC filter ensures that the power supply for the on-site sensor and the PLC controller has low interference and can improve its service life. The single-ended grounding of the shielded twisted pair cable shielding layer can suppress the potential difference to eliminate the interference of electromagnetic waves on the analog signal, and the DC signal isolation module can isolate the cross current, electromagnetic wave, and harmonic wave mixed in the analog signal, thereby ensuring that the analog signal output to the PLC controller is accurate and interference-free, realizing the automatic and precise control of the system.

[0031] The above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions of the present utility model or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present utility model.

Claims

1. An anti-electromagnetic interference AEM electrolysis hydrogen production electrical control system, characterized in that: It includes a switching power supply, an RC filter, a PLC controller, a field sensor, a shielded twisted pair cable, a DC signal isolation module, a cable shielding layer, a shielded grounding device and a shielded grounding body. The switching power supply is connected to the RC filter. The RC filter is respectively connected to the field sensor and the PLC controller through DC power supply. The field sensor is connected to the DC signal isolation module through a connecting line. The connecting line adopts a shielded twisted pair cable. A shielded grounding device is provided between the field sensor and the DC signal isolation module. The DC signal isolation module is connected to the PLC controller.

2. According to the electromagnetic interference resistant AEM electrolysis hydrogen production electrical control system of claim 1, it is characterized in that: The switching power supply output terminal and the RC filter are connected in series.

3. The anti-electromagnetic interference AEM electrolysis hydrogen production electrical control system according to claim 1 is characterized in that: A cable shielding layer is arranged on the outer side of the shielded twisted pair cable.

4. The anti-electromagnetic interference AEM electrolysis hydrogen production electrical control system according to claim 1 is characterized in that: The field sensors include temperature sensors, liquid level sensors, flow sensors, pressure sensors, differential pressure sensors and voltage sensors.

5. The anti-electromagnetic interference AEM electrolysis hydrogen production electrical control system according to claim 1 is characterized in that: The cable shielding layer on one side of the field sensor is suspended.

6. The anti-electromagnetic interference AEM electrolysis hydrogen production electrical control system according to claim 1 is characterized in that: The field sensor is connected to the input end of the DC signal isolation module through a connecting line, and the output end of the DC signal isolation module is connected to the PLC controller.

7. The anti-electromagnetic interference AEM electrolysis hydrogen production electrical control system according to claim 1 is characterized in that: The shielding grounding device is connected to the shielding grounding body.

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