Electrolytic hydrogen production system, filter circuit and filter device
By introducing a filter circuit into the water electrolysis hydrogen production system, the problem of unstable rectified current was solved, the stability and purity of gas produced by the electrolyzer were achieved, the adjustment frequency of the pneumatic diaphragm valve was reduced, and the stability and safety of the system were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-04-03
AI Technical Summary
In existing water electrolysis hydrogen production technology, the rectified current control relies on feedback from current transformers, which leads to unstable rectified current, affecting the gas production and purity of the electrolyzer, increasing the adjustment frequency of the pneumatic diaphragm valve, and thus affecting the system's stability and safety.
A filtering circuit is adopted, including a filtering unit, a power supply unit, a crystal oscillator unit, and a signal transmission unit. By filtering the current feedback signal output by the rectifier module, high-frequency noise and interference are removed, thereby achieving the stability of the current feedback signal. Combined with a PID control algorithm, the output current is adjusted.
This achieves stable output of rectified current, improves the stability and purity of gas produced by the electrolytic cell, reduces the adjustment frequency of the pneumatic diaphragm valve, and enhances the overall efficiency and safety of the system.
Smart Images
Figure CN224083408U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of hydrogen production technology, and in particular to an electrolytic hydrogen production system and a filter circuit and filter device. Background Technology
[0002] In existing water electrolysis hydrogen production technology, rectifier current control is achieved by using feedback signals from current transformers in the rectifier cabinet, combined with PID control algorithms, to adjust the output current so that it approaches the set current value.
[0003] However, due to the accuracy limitations and inherent characteristics of current transformers, the feedback current often fluctuates around the set value, leading to unstable gas production in the electrolyzer. This instability further causes pressure fluctuations inside the electrolyzer, which in turn affects the pressure stability of the downstream separation equipment, increases the adjustment frequency of the pneumatic diaphragm valve, causes excessive level differences between the hydrogen and oxygen separators, and reduces the purity of the produced gas. Utility Model Content
[0004] The main objective of this application is to provide an electrolytic hydrogen production system and a filter circuit and filter device to solve the problem of unstable rectified current output, achieve stable rectified current output, ensure the stability and purity of gas produced by the electrolytic cell, and reduce the adjustment frequency of the pneumatic diaphragm valve.
[0005] To achieve the above objectives, this application provides a filter circuit for an electrolytic hydrogen production system, including a filter unit, a power supply unit, a crystal oscillator unit, and a signal transmission unit.
[0006] One end of the power supply unit is connected to an external power supply, the other end of the power supply unit is connected to the filter unit, and the crystal oscillator unit is connected to the filter unit;
[0007] One end of the signal transmission unit is connected to the rectifier module in the electrolytic hydrogen production system, and the other end of the signal transmission unit is connected to the filter unit. The filter unit is used to filter the current feedback signal transmitted by the signal transmission unit. The current feedback signal is generated by the rectifier module.
[0008] Optionally, the signal transmission unit includes a first resistor, a second resistor, a first connection terminal, and a second connection terminal; one end of the first resistor serves as the first connection terminal of the signal transmission unit, the other end of the first resistor is connected to one end of the second resistor to form a first node, the other end of the second resistor serves as the second connection terminal of the signal transmission unit and is grounded; the first node is connected to the filtering unit.
[0009] Optionally, the filtering unit includes a microcontroller, and the power supply unit includes a third resistor; one end of the third resistor is connected to the external power supply and forms a second node, and the other end of the third resistor is connected to the reset pin of the microcontroller; the second node is connected to the power supply pin of the microcontroller.
[0010] Optionally, the power supply unit further includes a first capacitor and a second capacitor; one end of the first capacitor is connected to the power supply pin of the microcontroller, and the other end of the first capacitor is grounded to form a third node, the third node being grounded; one end of the second capacitor is connected to the power supply pin of the microcontroller and the third node, and the other end of the second capacitor is connected to the third node.
[0011] Optionally, the crystal oscillator unit includes a crystal oscillator; the crystal oscillator is connected in parallel between the first crystal oscillator pin and the second crystal oscillator pin of the microcontroller.
[0012] Optionally, the crystal oscillator unit further includes a third capacitor and a fourth capacitor; the third capacitor and the fourth capacitor are connected in series and then in parallel across the two ends of the crystal oscillator, and the third capacitor and the fourth capacitor are grounded.
[0013] In addition, to achieve the above objectives, this application also provides a filtering device for an electrolytic hydrogen production system, including the filtering circuit described above.
[0014] This application also provides an electrolytic hydrogen production system, including a filter device, a rectifier module, a control module, and an electrolyzer as described above; the filter device, the control module, and the electrolyzer are respectively connected to the rectifier module, and the filter device is used to receive and filter the current feedback signal output by the rectifier module, and output the filtered current feedback signal to the rectifier module.
[0015] Optionally, the electrolytic hydrogen production system further includes a separation module, a buffer module, and a hydrogen application terminal; the separation module is connected to the electrolytic cell, the buffer module is connected to the separation module, and the hydrogen application terminal is connected to the buffer module.
[0016] Optionally, the rectifier module is a rectifier cabinet.
[0017] The filtering circuit of the electrolytic hydrogen production system of this application transmits the current feedback signal output by the rectifier module to the filtering unit through the signal transmission unit. The filtering unit then filters the current feedback signal, thereby making the current feedback signal more stable and reducing the fluctuation of the rectified current output value caused by hardware precision and signal mutation. The electrolytic hydrogen production system uses the filtered current feedback signal to adjust the current output, which can make the gas production of the electrolytic hydrogen production system more stable, the control of the separation and post-processing equipment more stable, ensure the stability of gas production in the electrolyzer and the purity of the gas, and reduce the adjustment frequency of the pneumatic diaphragm valve. Attached Figure Description
[0018] Figure 1 This is one of the structural schematic diagrams of the filter circuit in the embodiments of this application;
[0019] Figure 2 This is a second schematic diagram of the filter circuit in an embodiment of this application;
[0020] Figure 3 This is a schematic diagram of the structure of the electrolytic hydrogen production system according to an embodiment of this application;
[0021] Figure 4 This is a specific example of the rectified current feedback curve before filtering in this application;
[0022] Figure 5 This is a specific example of the filtered rectified current feedback curve in this application;
[0023] In the diagram, 110 is the filtering unit; 120 is the power supply unit; 130 is the crystal oscillator unit; 140 is the signal transmission unit; 310 is the filtering device; 320 is the rectifier module; 330 is the control module; 340 is the electrolytic cell; 350 is the separation module; 360 is the buffer module; and 370 is the hydrogen application end.
[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0026] In the water electrolysis hydrogen production industry, the stability of current feedback is crucial for ensuring the gas production efficiency and gas purity of the electrolyzer. Current technology primarily relies on feedback from the rectifier cabinet's current transformer to control the output of the current PID (proportional-integral-derivative) controller, thereby adjusting the actual current to approximate the setpoint. However, due to transformer accuracy issues, this current feedback mechanism often causes current oscillations around the setpoint, leading to instability in the electrolyzer's gas production. Specifically, when the current feedback is unstable, the internal pressure of the electrolyzer fluctuates, affecting not only the electrolyzer's own gas production efficiency but also directly causing pressure fluctuations in the downstream separation equipment. To maintain normal system operation, the pneumatic diaphragm valve at the separation outlet must frequently adjust its opening to cope with constantly changing pressure conditions. This process not only increases the valve adjustment frequency but also increases the workload of equipment maintenance, severely impacting the stability and reliability of the entire system.
[0027] Furthermore, the unstable gas production from the electrolyzer leads to excessively large liquid level differences between the hydrogen and oxygen separation tanks, further deteriorating the gas separation effect and potentially posing safety risks. Simultaneously, gas purity is also significantly affected, failing to meet the high standards required for industrial applications. The root cause of these problems lies in the inherent characteristics of the rectifier cabinet's current transformer and the unstable fluctuations in its feedback current. Although the current transformer can provide some current feedback information, its accuracy limitations and response speed issues make it difficult to achieve precise current control, thus causing the aforementioned series of problems.
[0028] Therefore, this application provides an electrolytic hydrogen production system and a filter circuit and filter device. This addresses the problem of unstable gas production in the electrolyzer caused by current feedback fluctuations, reduces or even eliminates various drawbacks caused by current transformer feedback errors, thereby improving the overall efficiency and safety of water electrolysis hydrogen production, achieving stable output of rectified current, ensuring the stability and purity of gas produced by the electrolyzer, and reducing the adjustment frequency of the pneumatic diaphragm valve.
[0029] Figure 1 This is one of the structural schematic diagrams of the filter circuit in the embodiments of this application, such as... Figure 1 As shown, the filter circuit may include a filter unit 110, a power supply unit 120, a crystal oscillator unit 130, and a signal transmission unit 140.
[0030] One end of the power supply unit 120 is connected to an external power supply, and the other end of the power supply unit 120 is connected to the filter unit 110. The crystal oscillator unit 130 is connected to the filter unit 110. One end of the signal transmission unit 140 is connected to the rectifier module 320 in the electrolytic hydrogen production system, and the other end of the signal transmission unit 140 is connected to the filter unit 110. The filter unit 110 is used to filter the current feedback signal transmitted by the signal transmission unit 140. The current feedback signal is generated by the rectifier module 320.
[0031] In this embodiment, the filtering circuit includes a filtering unit 110, a power supply unit 120, a crystal oscillator unit 130, and a signal transmission unit 140. The power supply unit 120 is connected to the filtering unit 110 and can supply power to the filtering unit 110 so that the filtering unit 110 can work normally. The power supply unit 120 can be connected to an external power supply, which can be a 5V DC power supply.
[0032] The crystal oscillator unit 130 can be composed of a crystal oscillator Rx, capacitors, etc. The crystal oscillator unit 130 is connected to the filter unit 110, and provides a basic clock signal to the filter unit 110. Specifically, the main function of the crystal oscillator unit 130 is to generate a high-precision, high-stability clock signal, which serves as the system's basic clock source, providing a time reference for subsequent circuits. Through the high-precision clock signal provided by the crystal oscillator unit 130, the system can achieve precise time control and synchronous operation.
[0033] One end of the signal transmission unit 140 can be connected to the rectifier module 320 of the electrolytic hydrogen production system, and the other end can be connected to the filter unit 110. In this embodiment, the rectifier module 320 can receive a set current sent by the control module 330 in the electrolytic hydrogen production system, and the rectifier module 320 generates a current feedback signal based on the set current. Further, the rectifier module 320 can first output the current feedback signal to the filter circuit so that the filter circuit can filter the current feedback signal. The signal transmission unit 140 in the filter circuit receives the current feedback signal and transmits the current feedback signal to the filter unit 110. After the filter unit 110 filters the current feedback signal, it feeds the filtered current feedback signal back to the rectifier module 320 so that the rectifier module 320 can use the filtered current feedback signal to regulate the output current output to the electrolyzer 340.
[0034] Understandably, existing electrolytic hydrogen production systems typically employ closed-loop control strategies to control the rectified current. Specifically, the rectifier module 320 in the electrolytic hydrogen production system collects the feedback value of the rectified current in real time through a current transformer and compares it with a preset set current to determine the deviation between the current rectified current and the set current. Based on the comparison result, the actual output current of the rectifier module 320 is adjusted through a feedback adjustment mechanism. This adjustment process usually relies on a PID (Proportional-Integral-Derivative) control algorithm. The PID controller calculates the corresponding control quantity based on the magnitude and trend of the current deviation and applies it to the rectifier module 320 to adjust its output current, gradually bringing it closer to the set current. However, due to factors such as the accuracy of the current transformer, the collected current feedback value fluctuates, thus affecting the adjustment accuracy of the rectified current.
[0035] In this embodiment, the current feedback signal is filtered by the filtering unit 110 to remove high-frequency noise and interference components, making the current feedback signal smoother and more stable, thereby reducing its fluctuation. When the current output from the rectifier module 320 to the electrolytic cell 340 is more stable, the gas production of the electrolytic cell 340 will also be more stable and uniform, thus ensuring the stability and purity of the gas produced by the electrolytic cell 340. Furthermore, due to the reduced fluctuation of the rectified current, the pressure fluctuation inside the electrolytic cell 340 and the downstream separation equipment also decreases, thereby reducing the adjustment frequency of the pneumatic diaphragm valve.
[0036] In some implementations, the filtering unit 110 performs filtering processing on the current feedback signal in the following specific manner:
[0037] First, the current feedback signal undergoes analog-to-digital (AD) conversion. This step converts the analog current signal into a digital signal for subsequent digital processing. During the conversion, the filter unit 110 filters out interference signals outside the measurement range, ensuring that only the valid current feedback signal enters the subsequent processing stage.
[0038] Furthermore, the current feedback signal after AD conversion is subjected to amplitude limiting filtering. The purpose of amplitude limiting filtering is to eliminate outliers or abrupt changes in the signal. By setting a reasonable upper and lower limit range, signal values exceeding the range are restricted to the boundaries, thereby avoiding the impact of extreme values on subsequent processing.
[0039] The filter unit 110 continuously samples N data points (i.e., current feedback values) and performs sliding processing on these data. Specifically, first, a maximum and a minimum value are removed from the N data points to eliminate possible outliers. Then, the remaining N-2 data points are grouped together and subjected to continuous sliding processing. The sliding processing method involves sampling a new data point each time, adding it to the data group, and simultaneously removing the oldest data point, thereby maintaining the continuity and dynamic updating of the data group.
[0040] Furthermore, the N-2 data sets obtained after the sliding process are fed into a queue of fixed length N-2. Each time a new data point is sampled, it is placed at the tail of the queue, while the data at the head of the queue is removed. This queue structure ensures the first-in, first-out (FIFO) property of the data, so that the data in the queue is always the latest N-2 sampled points.
[0041] The filtering unit 110 performs an arithmetic average operation on the N-2 data points stored in the queue. Specifically, the filtering unit 110 adds up all the data in the queue and divides the sum by the number of data points N-2 to obtain an average value. This average value is the filtered current feedback value. By performing an arithmetic average operation, the current signal can be further smoothed, reducing the impact of random noise and fluctuations.
[0042] Finally, the filtered current feedback signal (i.e., the current feedback value) is transmitted to the rectifier module 320. The rectifier module 320 uses this filtered current feedback signal as input and, in conjunction with a PID control algorithm, precisely adjusts the output rectified current. In this way, the electrolytic hydrogen production system can achieve more stable and precise current control, thereby improving the gas production stability of the electrolyzer 340.
[0043] Figure 2 This is a second schematic diagram of the filter circuit in an embodiment of this application.
[0044] like Figure 2 As shown, in some embodiments, the signal transmission unit 140 includes a first resistor R1, a second resistor R2, a first connection terminal IN+, and a second connection terminal IN-.
[0045] In this configuration, one end of the first resistor R1 serves as the first connection terminal IN+ of the signal transmission unit 140, the other end of the first resistor R1 is connected to one end of the second resistor R2 to form the first node N1, and the other end of the second resistor R2 serves as the second connection terminal IN- of the signal transmission unit 140 and is grounded; the first node N1 is connected to the filter unit 110.
[0046] In this embodiment, the first resistor R1 and the second resistor R2 can be 10K resistors. The first resistor R1 and the second resistor R2 are connected in series, and the filter unit 110 is connected between the first resistor R1 and the second resistor R2. In addition, one end of the first resistor R1 is the first connection terminal IN+ of the signal transmission unit 140, and one end of the second resistor R2 is the second connection terminal IN- of the signal transmission unit 140.
[0047] When the rectifier module 320 inputs a current feedback signal to the filter circuit, the current feedback signal enters the filter circuit through the first connection terminal IN+ and the second connection terminal IN-, and then enters the filter unit 110 through the first resistor R1 and the second resistor R2. In this embodiment, the first resistor R1 and the second resistor R2 can be used to set the bias voltage of the input current feedback signal, ensuring that the current feedback signal input to the filter circuit is within the voltage range suitable for the AD converter in the filter unit 110. In addition, the first resistor R1 and the second resistor R2 can also play a certain current limiting role.
[0048] In some embodiments, the filter unit 110 includes a microcontroller U1, and the power supply unit 120 includes a third resistor R3, a first capacitor C1, and a second capacitor C2.
[0049] In this configuration, one end of the third resistor R3 is connected to an external power supply, forming the second node N2, and the other end of the third resistor R3 is connected to the reset pin RST of the microcontroller U1; the second node N2 is connected to the power supply pin VCC of the microcontroller U1. One end of the first capacitor C1 is connected to the power supply pin VCC of the microcontroller U1, and the other end of the first capacitor C1 is grounded, forming the third node N3, which is grounded; one end of the second capacitor C2 is connected to the power supply pin VCC of the microcontroller U1 and the third node N3, and the other end of the second capacitor C2 is connected to the third node N3.
[0050] It should be noted that the microcontroller U1 can be an STC2052AD microcontroller; the external power supply can be a 5V DC power supply; the first capacitor C1 and the second capacitor C2 can be 0.1μF capacitors; and the third resistor R3 can be a 10K resistor.
[0051] In this embodiment, the power supply unit 120 can provide power to the entire filter circuit. The third resistor R3 in the power supply unit 120 can play a certain current limiting role, and the first capacitor C1 and the second capacitor C2 can play a certain decoupling role. The first capacitor C1 and the second capacitor C2 are placed close to the microcontroller U1 to reduce noise on the power line and ensure a stable power supply.
[0052] Continue to refer to Figure 2 In some embodiments, the crystal oscillator unit 130 includes a crystal oscillator Rx, a third capacitor C3, and a fourth capacitor C4.
[0053] The crystal oscillator Rx is connected in parallel between the first crystal pin XTAL1 and the second crystal pin XTAL2 of the microcontroller U1. The third capacitor C3 and the fourth capacitor C4 are connected in series and then in parallel across the two ends of the crystal oscillator Rx, and the third capacitor C3 and the fourth capacitor C4 are grounded.
[0054] Specifically, one end of the crystal oscillator Rx can be connected to the first crystal oscillator pin XTAL1 of the microcontroller U1, and the other end of the crystal oscillator Rx can be connected to the second crystal oscillator pin XTAL2 of the microcontroller U1. One end of the third capacitor C3 can be connected to the first crystal oscillator pin XTAL1 of the microcontroller U1, and the other end of the third capacitor C3 is grounded. One end of the fourth capacitor C4 can be connected to the second crystal oscillator pin XTAL2 of the microcontroller U1, and the other end of the fourth capacitor C4 is grounded.
[0055] It should be noted that the third capacitor C3 and the fourth capacitor C4 can be 20pF capacitors, and the crystal oscillator Rx can be a 16M crystal oscillator.
[0056] In this embodiment, the crystal oscillator Rx provides the clock signal for the system. The third capacitor C3 and the fourth capacitor C4, together with the crystal oscillator Rx, form an oscillation circuit. The values of the third capacitor C3 and the fourth capacitor C4 affect the operating frequency of the crystal oscillator Rx. Therefore, setting the values of the third capacitor C3 and the fourth capacitor C4 ensures that the crystal oscillator Rx operates stably at an appropriate frequency. Furthermore, the third capacitor C3 and the fourth capacitor C4 also play a certain filtering role to improve the quality of the clock signal.
[0057] Continue to refer to Figure 2 In some implementations, the first resistor R1 and the second resistor R2 can be connected to the P1.5 pin of the microcontroller U1; the filter circuit may also include a first output terminal OUT+ and a second output terminal OUT-.
[0058] The first output terminal OUT+ can be connected to pin P3.4 of the microcontroller U1, and the second output terminal OUT- can be connected to the ground pin GND of the microcontroller U1. Furthermore, the ground pin GND of the microcontroller U1 is grounded. In this embodiment, after the microcontroller U1 filters the current feedback signal, it can output the filtered current feedback signal to the rectifier module 320 through the first output terminal OUT+ and the second output terminal OUT-.
[0059] Based on the above embodiments, this application also provides a filtering device for an electrolytic hydrogen production system, which may include the filtering circuit described above.
[0060] It should be noted that for details not disclosed in the filtering device of the electrolytic hydrogen production system in this embodiment, please refer to the details disclosed in the embodiment of the filtering circuit of the electrolytic hydrogen production system in this specification, which will not be repeated here.
[0061] Based on the above embodiments, this application also provides an electrolytic hydrogen production system. Figure 3 This is a schematic diagram of the electrolytic hydrogen production system according to an embodiment of this application. Figure 3 As shown, the electrolytic hydrogen production system may include the filter device 310, rectifier module 320, control module 330 and electrolytic cell 340 as described above.
[0062] The filter device 310, control module 330, and electrolytic cell 340 are respectively connected to the rectifier module 320. The filter device 310 is used to receive and filter the current feedback signal output by the rectifier module 320, and output the filtered current feedback signal to the rectifier module 320.
[0063] It should be noted that the control module 330 can be a system control cabinet that is already available on the market, and the rectifier module 320 can be a rectifier cabinet that is already available on the market.
[0064] The control module 330 is the core control unit of the entire electrolysis hydrogen production system, responsible for monitoring and regulating the operating status of each subsystem. Specifically, the control module 330 can set the current of the rectifier module 320 to ensure a stable power input to the electrolyzer 340. Furthermore, it can monitor and control valves, instruments, and other equipment in the downstream separation module 350 to ensure a stable and reliable hydrogen and oxygen separation process. It can also control and monitor the buffer device to ensure that hydrogen storage and supply meet the application requirements.
[0065] The main task of the rectifier module 320 is to provide the electrical energy required for hydrogen production to the electrolyzer 340, and it also has a current regulation function. Specifically, the rectifier module 320 can convert the input AC power into the DC power required by the electrolyzer 340, and adjust the output current according to the given current from the control module 330 to ensure the stable operation of the electrolyzer 340. The electrolyzer 340 is the core device for water electrolysis hydrogen production, responsible for decomposing water into hydrogen and oxygen.
[0066] In the process of hydrogen production through water electrolysis, the control module 330 first outputs a given current value to the rectifier module 320, which then adjusts the output current according to the given current value. Simultaneously, the current transformer in the rectifier module 320 collects a current feedback signal, which is then output to the filter device 310. The filter device 310 filters the current feedback signal before transmitting it back to the rectifier module 320. Based on the filtered current feedback signal, the rectifier module 320 uses a PID control algorithm to control and adjust the output current to the electrolyzer 340.
[0067] In some embodiments, the electrolytic hydrogen production system further includes a separation module 350, a buffer module 360, and a hydrogen application terminal 370; the separation module 350 is connected to the electrolyzer 340, the buffer module 360 is connected to the separation module 350, and the hydrogen application terminal 370 is connected to the buffer module 360.
[0068] In this embodiment, the separation module 350 is used to separate the hydrogen and oxygen produced by the electrolyzer 340. Specifically, the separation module 350 separates the hydrogen and oxygen in the mixed gas using physical or chemical methods to ensure the purity and stability of the separated gas.
[0069] The buffer module 360 (such as a hydrogen balloon tank) is used to store the hydrogen separated by the separation module 350, providing a stable gas source for the hydrogen application terminal 370. The buffer module 360 can also adjust the pressure and flow rate of the hydrogen to meet the specific needs of the application terminal.
[0070] Hydrogen application end 370 refers to various industries or equipment that use hydrogen, such as the chemical industry and fuel cells. Specifically, hydrogen application end 370 uses hydrogen as a raw material or energy source to carry out corresponding production or power generation processes. No specific definition of hydrogen application end 370 is given here.
[0071] The filtering effect of the filtering device 310 in this embodiment will be described in detail below through a specific example.
[0072] In this example, assume a given current value of 100A and a filter queue length of N = 8. The 20 randomly sampled rectified current feedback values (i.e., current feedback signals) before filtering are: 101.2, 99.5, 97.6, 104.2, 99.5, 98.6, 102.5, 101.6, 100.8, 99.2, 98.3, 97.6, 98.5, 99.7, 100.2, 101, 101.6, 102.2, 103.4, and 102.7, in A. Figure 4 This is a specific example of the rectified current feedback curve before filtering in this application. Figure 4In the diagram, the horizontal axis represents the sampling point number, and the vertical axis represents the rectified current feedback value. For example... Figure 4 As shown, the data in the rectified current feedback curve before filtering fluctuates significantly, with a maximum amplitude of 6.6A (from 97.6A to 104.2A).
[0073] The process of filtering the current feedback signal using the filtering device 310 of this application embodiment is as follows: the length of the filtering queue is 8 (N=8), and the initial data is the first 8 sample values: [101.2, 99.5, 97.6, 104.2, 99.5, 98.6, 102.5, 101.6]. The 8 data points in the queue are sorted, and one maximum value (104.2) and one minimum value (97.6) are removed, leaving 6 data points: [99.5, 99.5, 98.6, 101.2, 101.6, 102.5]. The arithmetic mean of the remaining 6 data points is calculated as: (99.5+99.5+98.6+101.2+101.6+102.5) / 6≈100.483, and the first data point after filtering is 100.483.
[0074] The queue is updated by sliding. When a new sampled value of 100.8 is sampled, it is added to the tail of the queue, while the value of 101.2 at the head of the queue is removed. The updated queue is: [99.5, 97.6, 104.2, 99.5, 98.6, 102.5, 101.6, 100.8]. The value of the second data point is then calculated using the same method. This process is repeated continuously. Finally, after filtering the 20 randomly sampled rectified current feedback values, the first 13 data points are: 100.483, 100.417, 100.367, 100.367, 99.667, 99.5, 99.683, 99.45, 99.45, 99.483, 99.883, 100.533, 101.233. Figure 5 This is a specific example of the filtered rectified current feedback curve from this application. Figure 5 In the diagram, the horizontal axis represents the sampling point number, and the vertical axis represents the rectified current feedback value. For example... Figure 5 As shown, the fluctuations in the rectified current feedback curve after filtering are significantly reduced, with a maximum amplitude of 1.783A (from 99.45A to 101.233A). Compared to the maximum amplitude of 6.6A before filtering, the data after filtering is smoother and more stable.
[0075] Therefore, when the filtered current feedback signal is used in PID control, control oscillations caused by data interference and sudden changes can be effectively avoided. This makes the rectified current output more stable, resulting in a more uniform gas production from the electrolyzer 340 and higher gas purity. The application of the filter device 310 makes the overall system operation more stable, reduces pressure fluctuations in the downstream separation module 350 and the adjustment frequency of the pneumatic diaphragm valve, making the overall operation of the electrolytic hydrogen production system more efficient and reliable.
[0076] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A filter circuit for an electrolytic hydrogen generation system, characterized by, The filter unit, the power supply unit, the crystal oscillator unit and the signal transmission unit are included. One end of the power supply unit is connected with an external power supply, and the other end of the power supply unit is connected with the filter unit. One end of the signal transmission unit is connected with a rectification module in an electrolytic hydrogen production system, and the other end of the signal transmission unit is connected with the filter unit.
2. The filter circuit of the electrolytic hydrogen generator system according to claim 1, characterized by, The signal transmission unit includes a first resistor, a second resistor, a first connection end and a second connection end. One end of the first resistor is the first connection end of the signal transmission unit, and the other end of the first resistor is connected with one end of the second resistor to form a first node. The first node is connected with the filter unit.
3. The filter circuit of the electrolytic hydrogen generator system according to claim 1, wherein, The power supply unit includes a third resistor. One end of the third resistor is connected with the external power supply to form a second node, and the other end of the third resistor is connected with a reset pin of the single-chip microcomputer. The second node is connected with a power supply pin of the single-chip microcomputer.
4. The filter circuit of the electrolytic hydrogen generator system according to claim 3, characterized by, The power supply unit further includes a first capacitor and a second capacitor. One end of the first capacitor is connected with the power supply pin of the single-chip microcomputer, and the other end of the first capacitor is grounded to form a third node. One end of the second capacitor is connected with the power supply pin of the single-chip microcomputer and the third node, and the other end of the second capacitor is connected with the third node.
5. The filter circuit of the electrolytic hydrogen generator system according to claim 3, wherein, The crystal oscillator unit includes a crystal oscillator. The crystal oscillator is connected in parallel between a first crystal oscillator pin and a second crystal oscillator pin of the single-chip microcomputer.
6. The filter circuit of the electrolytic hydrogen generator system according to claim 5, wherein, The crystal oscillator unit further includes a third capacitor and a fourth capacitor. The third capacitor and the fourth capacitor are connected in series and then connected in parallel across the crystal oscillator, and the third capacitor and the fourth capacitor are grounded.
7. A filtering device for an electrolytic hydrogen production system, characterized in that The filter circuit includes the filter circuit according to any one of claims 1-6.
8. An electrolytic hydrogen production system, characterized by, The filter device, the rectification module, the control module and the electrolytic tank are included. The filter device, the control module and the electrolytic tank are respectively connected with the rectification module, and the filter device is used for receiving and filtering a current feedback signal output by the rectification module and outputting the filtered current feedback signal to the rectification module.
9. The electrolytic hydrogen generation system of claim 8, wherein, The electrolytic hydrogen production system further includes a separation module, a buffer module and a hydrogen application end. The separation module is connected with the electrolytic tank, the buffer module is connected with the separation module, and the hydrogen application end is connected with the buffer module.
10. The electrolytic hydrogen generation system of claim 8, wherein, The rectification module is a rectification cabinet.