Calibration system of hydrogen-oxygen sensor

Abstract

The invention provides a calibration system of a hydrogen-oxygen sensor. The calibration system of the hydrogen-oxygen sensor comprises a hydrogen electrolysis cell, an oxygen electrolysis cell, an oxygen treatment unit, a power supply unit, a hydrogen-oxygen mixing tank and a controller, the output end of the controller is electrically connected with the controlled end of the power supply unit, the input end of the controller is used for being electrically connected with the output end of a target hydrogen-oxygen sensor to be calibrated, the power supply end of the hydrogen electrolysis cell is electrically connected with the first output end of the power supply unit, and the power supply end of the oxygen electrolysis cell is electrically connected with the second output end of the power supply unit. The hydrogen electrolytic cell is arranged in the hydrogen-oxygen mixing tank, and the oxygen electrolytic cell is communicated with the hydrogen-oxygen mixing tank through the oxygen treatment unit. The calibration hydrogen and the calibration oxygen are generated in real time through electrolysis and do not need to be stored in advance, and the precision cannot be affected by long-time storage; in addition, the hydrogen electrolytic cell is directly arranged in the hydrogen-oxygen mixing tank, and calibrated hydrogen generated by electrolysis is directly stored in the hydrogen-oxygen mixing tank, so that the gas mixing difficulty is reduced, and the gas mixing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a calibration system for a hydrogen and oxygen sensor. Background Art

[0002] In the hydrogen production system of water electrolysis, the purity of hydrogen must be guaranteed. The hydrogen production equipment will be equipped with an oxygen-in-hydrogen analyzer and an oxygen-in-hydrogen analyzer, which can be collectively referred to as hydrogen and oxygen sensors. In order to ensure the stability and accuracy of the hydrogen and oxygen sensors, they need to be calibrated regularly using calibration gases, which include calibration hydrogen and calibration oxygen.

[0003] Existing hydrogen and oxygen sensor calibrations often use external hydrogen and oxygen storage bottles to mix gases through a proportional valve. Since the flow calibration method requires the use of external hydrogen and oxygen storage bottles, the internal calibration gas will be affected by the surrounding area when stored for a long time, affecting the accuracy of the gas mixing. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a calibration system for a hydrogen and oxygen sensor.

[0005] In one embodiment, the present invention provides a calibration system for a hydrogen and oxygen sensor, the calibration system for the hydrogen and oxygen sensor comprising a hydrogen electrolyzer, an oxygen electrolyzer, an oxygen processing unit, a power supply unit, a hydrogen and oxygen mixing tank, and a controller;

[0006] The output end of the controller is electrically connected to the controlled end of the power supply unit, the input end of the controller is used to be electrically connected to the output end of the target hydrogen and oxygen sensor to be calibrated, the power supply end of the hydrogen electrolyzer is electrically connected to the first output end of the power supply unit, the power supply end of the oxygen electrolyzer is electrically connected to the second output end of the power supply unit, the hydrogen electrolyzer is arranged in the hydrogen and oxygen mixing tank, and the oxygen electrolyzer is connected to the hydrogen and oxygen mixing tank through the oxygen treatment unit;

[0007] The controller is used to output a power control signal to the power supply unit, so that the power supply unit outputs a first power supply to the hydrogen electrolyzer and outputs a second power supply to the oxygen electrolyzer;

[0008] The hydrogen electrolyzer is used to electrolyze and obtain calibrated hydrogen according to the input first power source and the connected first water source;

[0009] The oxygen electrolyzer is used to electrolyze and obtain calibrated oxygen according to the input second power supply and the connected second water source;

[0010] The hydrogen-oxygen mixing tank is used to mix the calibrated hydrogen gas inside itself with the calibrated oxygen connected through the oxygen processing unit to obtain a hydrogen-oxygen mixed gas and transport it to the target hydrogen-oxygen sensor, so that the target hydrogen-oxygen sensor performs calibration detection and feeds back the target detection signal to the controller;

[0011] The controller is also used to obtain a calibration result according to the output power control signal and the input target detection signal.

[0012] In one embodiment, the power supply unit includes a first sub-power supply unit and a second sub-power supply unit;

[0013] The controlled end of the first sub-power supply unit is electrically connected to the first output end of the controller, and the output end of the first sub-power supply unit is electrically connected to the power supply end of the hydrogen electrolyzer, and is used to output the first power supply to the hydrogen electrolyzer according to the first control signal output by the controller;

[0014] The controlled end of the second sub-power supply unit is electrically connected to the second output end of the controller, and the output end of the second sub-power supply unit is electrically connected to the power supply end of the oxygen electrolyzer, and is used to output the second power supply to the oxygen electrolyzer according to the second control signal output by the controller;

[0015] The power control signal includes a first control signal and a second control signal.

[0016] In one embodiment, the first sub-power supply unit includes a first drive circuit and a first power circuit, and the second sub-power supply unit includes a second drive circuit and a second power circuit;

[0017] The controlled end of the first drive circuit is electrically connected to the first output end of the controller, the driving end of the first drive circuit is electrically connected to the controlled end of the first power circuit, the input end of the first power circuit is used to connect to the initial power supply, and the output end of the first power circuit is electrically connected to the power supply end of the hydrogen electrolyzer;

[0018] The controlled end of the second drive circuit is electrically connected to the second output end of the controller, the driving end of the second drive circuit is electrically connected to the controlled end of the second power circuit, the input end of the second power circuit is used to access the initial power supply, and the output end of the second power circuit is electrically connected to the power supply end of the oxygen electrolyzer.

[0019] In one embodiment, the first power circuit includes a first NMOS transistor, a second NMOS transistor, a first inductor and a power relay;

[0020] The gate of the first NMOS tube is electrically connected to the first driving end of the first driving circuit, the gate of the second NMOS tube is electrically connected to the second driving end of the first driving circuit, the drain of the first NMOS tube is used to be electrically connected to the initial power supply, the source of the first NMOS tube is electrically connected to the drain of the second NMOS tube and the first end of the first inductor respectively, the source of the second NMOS tube is used to be grounded, the second end of the first inductor is electrically connected to the first access end of the power relay, the second access end of the power relay is electrically connected to the power supply end of the hydrogen electrolyzer, and the controlled end of the power relay is electrically connected to the first driving end of the controller.

[0021] In one embodiment, the second power circuit includes a triode, an optocoupler, a first PMOS tube, a second PMOS tube, a first resistor, a second resistor, a third NMOS tube, a fourth NMOS tube, a fifth NMOS tube, a sixth NMOS tube, a second inductor, a seventh NMOS tube, an eighth NMOS tube, a ninth NMOS tube, and a tenth NMOS tube;

[0022] The base of the transistor is electrically connected to the second driving end of the controller, the emitter of the transistor is used for grounding, the collector of the transistor is connected in series with the light-emitting diode in the optocoupler, the emitter of the photosensitive transistor in the optocoupler is grounded, the collector of the photosensitive transistor in the optocoupler is electrically connected to the gate of the first PMOS tube, the first end of the first resistor, the gate of the second PMOS tube and the first end of the second resistor, respectively, and the drain of the first PMOS tube and the drain of the second PMOS tube are used for electrically connecting to the initial power supply respectively;

[0023] The source of the first PMOS tube, the second end of the first resistor, the source of the second PMOS tube, and the second end of the second resistor are electrically connected to the drain of the third NMOS tube and the drain of the fourth NMOS tube, respectively; the source of the third NMOS tube and the source of the fourth NMOS tube are electrically connected to the drain of the fifth NMOS tube, the drain of the sixth NMOS tube, and the first end of the second inductor, respectively; the source of the fifth NMOS tube and the source of the sixth NMOS tube are used for grounding, respectively; the gate of the third NMOS tube is electrically connected to the first driving end of the second driving circuit, the gate of the fourth NMOS tube is electrically connected to the second driving end of the second driving circuit, the gate of the fifth NMOS tube is electrically connected to the third driving end of the second driving circuit, and the gate of the sixth NMOS tube is electrically connected to the fourth driving end of the second driving circuit;

[0024] The second end of the second inductor is electrically connected to the drain of the seventh NMOS tube and the drain of the eighth NMOS tube respectively, the source of the seventh NMOS tube is electrically connected to the source of the ninth NMOS tube, the source of the eighth NMOS tube is electrically connected to the source of the tenth NMOS tube, the drain of the ninth NMOS tube and the drain of the tenth NMOS tube are electrically connected to the power supply end of the oxygen electrolyzer respectively, and the gate of the seventh NMOS tube, the gate of the eighth NMOS tube, the gate of the ninth NMOS tube and the gate of the tenth NMOS tube are electrically connected to the third driving end of the controller respectively.

[0025] In one embodiment, the oxygen processing unit includes an oxygen-water vapor separation subunit and an oxygen drying subunit;

[0026] The input port of the oxygen-water vapor separation subunit is connected to the oxygen electrolyzer, the output port of the oxygen-water vapor separation subunit is connected to the input port of the oxygen drying subunit, and the output port of the oxygen drying subunit is connected to the hydrogen-oxygen mixing tank.

[0027] In one embodiment, the calibration system of the hydrogen and oxygen sensor further includes a water supply tank, a heating and temperature-controlled water tank, a temperature sensor, a first water storage tank, a first water pump, a second water storage tank, a second water pump, a first speed sensor, and a second speed sensor;

[0028] The output port of the water replenishment tank is connected to the input port of the heating and temperature-controlling water tank, the output port of the heating and temperature-controlling water tank is connected to the input port of the first water storage tank and the input port of the second water storage tank respectively, the output port of the first water storage tank is connected to the hydrogen electrolyzer, and the output port of the second water storage tank is connected to the oxygen electrolyzer;

[0029] The temperature sensor is arranged in the heating temperature-control water tank and is electrically connected to the controller, the first water pump is arranged in the first water storage tank and is electrically connected to the controller, and the first speed sensor and the second speed sensor are electrically connected to the controller respectively;

[0030] The controller is used to control the heating of the heating temperature-controlled water tank according to the temperature signal fed back by the temperature sensor;

[0031] The controller is used to control the speed of the first water pump according to the first speed signal of the first water pump fed back by the first speed sensor, so as to output the first water source to the hydrogen electrolyzer according to the stored water source in the first water storage tank;

[0032] The controller is used to control the speed of the second water pump according to the second speed signal of the second water pump fed back by the second speed sensor, so as to output the second water source to the oxygen electrolyzer according to the stored water source in the second water storage tank.

[0033] In one embodiment, the output wire group of the temperature sensor adopts a four-wire system.

[0034] In one embodiment, the calibration system of the hydrogen and oxygen sensor further includes an analog quantity acquisition unit and an analog-to-digital conversion unit;

[0035] The input end of the analog quantity acquisition unit is electrically connected to the target hydrogen and oxygen sensor, the temperature sensor, the first speed sensor and the second speed sensor respectively, the output end of the analog quantity acquisition unit is electrically connected to the input end of the analog-to-digital conversion unit, and the output end of the analog-to-digital conversion unit is electrically connected to the input end of the controller.

[0036] In one embodiment, the analog quantity acquisition unit includes a temperature analog quantum acquisition unit, and the temperature analog quantum acquisition unit includes a first operational amplifier, a second operational amplifier and a third PMOS tube;

[0037] The inverting input terminal of the first operational amplifier and the source of the third PMOS tube are respectively used to access the working voltage, the non-inverting input terminal of the first operational amplifier is used to access the reference voltage, the output terminal of the first operational amplifier is electrically connected to the gate of the third PMOS tube, the non-inverting input terminal of the second operational amplifier is respectively electrically connected to the drain of the third PMOS tube, the first line of the temperature sensor and the second line of the temperature sensor, the inverting input terminal of the second operational amplifier is respectively electrically connected to the third line of the temperature sensor and the fourth line of the temperature sensor, and the output terminal of the second operational amplifier is electrically connected to the analog-to-digital conversion unit.

[0038] Through the calibration system of the hydrogen and oxygen sensor, a controlled power supply unit is used, so that the power supply unit outputs the first power supply and the second power supply for electrolysis to the hydrogen electrolyzer and the oxygen electrolyzer respectively according to demand under the control of the controller, so that the hydrogen electrolyzer and the oxygen electrolyzer produce corresponding amounts of calibration hydrogen and calibration oxygen, which are finally mixed in the hydrogen and oxygen mixing tank. In this process, the calibration hydrogen and calibration oxygen are generated in real time by electrolysis, without the need for pre-storage, and the accuracy will not be affected by long-term storage; in addition, the hydrogen electrolyzer is directly arranged in the hydrogen and oxygen mixing tank, and the calibration hydrogen generated by electrolysis is directly stored in the hydrogen and oxygen mixing tank, which reduces the difficulty of mixing and improves the efficiency of mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 Schematic diagram of the structure of a calibration system for hydrogen and oxygen sensors in one embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a specific circuit implementation of a first power circuit in one embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a specific circuit implementation of a second power circuit in one embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the structure of a temperature sensor in one embodiment of the present invention;

[0044] Figure 5 A schematic diagram of a specific circuit implementation of a temperature simulation quantum acquisition unit in one embodiment of the present invention;

[0045] Figure 6 A schematic diagram of a specific circuit implementation of a speed simulation quantum acquisition unit in one embodiment of the present invention;

[0046] Figure 7 The figure is a schematic diagram of a specific circuit implementation of a liquid level simulation quantum acquisition unit in one embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any person skilled in the art to implement and use the present invention, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present invention obscure. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0049] like Figure 1 As shown, in one embodiment, the present invention provides a calibration system for a hydrogen and oxygen sensor, and the calibration system for the hydrogen and oxygen sensor includes a hydrogen electrolyzer, an oxygen electrolyzer, an oxygen processing unit, a power supply unit, a hydrogen and oxygen mixing tank, and a controller.

[0050] It should be noted that in Figure 1 In the figure, thin solid lines represent power supply lines or signal lines, and thick solid lines represent gas pipelines or liquid pipelines.

[0051] Among them, the output end of the controller is electrically connected to the controlled end of the power supply unit, the input end of the controller is used to be electrically connected to the output end of the target hydrogen and oxygen sensor to be calibrated, the power supply end of the hydrogen electrolyzer is electrically connected to the first output end of the power supply unit, the power supply end of the oxygen electrolyzer is electrically connected to the second output end of the power supply unit, the hydrogen electrolyzer is arranged in the hydrogen and oxygen mixing tank, and the oxygen electrolyzer is connected to the hydrogen and oxygen mixing tank through the oxygen treatment unit.

[0052] Among them, the controller includes MCU (single-chip microcomputer) and the like.

[0053] The controller is used to output a power control signal to the power unit, so that the power unit outputs the first power to the hydrogen electrolyzer and outputs the second power to the oxygen electrolyzer.

[0054] Among them, the first power supply and the second power supply are used to provide the first electrolysis current and the second electrolysis current to the hydrogen electrolysis cell respectively. Electrolysis currents of different sizes can produce different amounts of hydrogen or oxygen, so that the controller can determine the corresponding electrolysis current according to the gas volume demand, and then send the corresponding power control signal to the power supply unit, so that the power supply unit generates the first power supply corresponding to the first electrolysis current and the second power supply corresponding to the second electrolysis current.

[0055] Specifically, the power supply unit includes a first sub-power supply unit and a second sub-power supply unit.

[0056] The controlled end of the first sub-power supply unit is electrically connected to the first output end of the controller, and the output end of the first sub-power supply unit is electrically connected to the power supply end of the hydrogen electrolyzer, and is used to output the first power to the hydrogen electrolyzer according to the first control signal output by the controller; the controlled end of the second sub-power supply unit is electrically connected to the second output end of the controller, and the output end of the second sub-power supply unit is electrically connected to the power supply end of the oxygen electrolyzer, and is used to output the second power to the oxygen electrolyzer according to the second control signal output by the controller; the power supply control signal includes a first control signal and a second control signal.

[0057] Among them, in this embodiment, two independent sub-power supply units can be used to realize the power supply of the hydrogen electrolyzer and the oxygen electrolyzer respectively, so that the independence of power supply control can be improved, and the control accuracy can be improved to a certain extent. Of course, in other embodiments, the power supply unit can also adopt a dual-channel structure, so as to realize the power supply of the hydrogen electrolyzer and the oxygen electrolyzer respectively.

[0058] The hydrogen electrolyzer is used for obtaining calibrated hydrogen by electrolysis according to the input first power source and the connected first water source.

[0059] The first water source can be pre-stored in the hydrogen electrolyzer or injected into the hydrogen electrolyzer in real time. Under the action of the first power source, based on the principle of hydrogen production by electrolysis, the first water source is electrolyzed into hydrogen, and the generated hydrogen can be used as calibration hydrogen for calibration.

[0060] The oxygen electrolyzer is used for obtaining calibrated oxygen by electrolysis according to the input second power supply and the connected second water source.

[0061] The second water source can be pre-stored in the oxygen electrolysis tank or injected into the oxygen electrolysis tank in real time. Under the action of the second power source, based on the principle of electrolytic oxygen production, the second water source is electrolyzed into oxygen, and the generated oxygen can be used as calibration oxygen for calibration.

[0062] The hydrogen-oxygen mixing tank is used to mix the calibrated hydrogen gas inside itself with the calibrated oxygen connected through the oxygen processing unit to obtain a hydrogen-oxygen mixed gas and transport it to the target hydrogen-oxygen sensor, so that the target hydrogen-oxygen sensor can perform calibration detection and feedback the target detection signal to the controller.

[0063] Among them, when calibration hydrogen and calibration oxygen exist in the hydrogen-oxygen mixing tank at the same time, as the gas molecules diffuse, the purpose of gas mixing is achieved in the hydrogen-oxygen mixing tank, and the final hydrogen-oxygen mixed gas used for calibration is obtained.

[0064] Among them, the target hydrogen and oxygen sensor itself has the function of hydrogen and oxygen detection. If the target hydrogen and oxygen sensor is an oxygen-in-hydrogen sensor, it can output a target detection signal representing the concentration or proportion of oxygen in hydrogen; if the target hydrogen and oxygen sensor is a hydrogen-in-oxygen sensor, it can output a target detection signal representing the concentration or proportion of hydrogen in oxygen.

[0065] The controller is also used to obtain a calibration result according to the output power control signal and the input target detection signal.

[0066] Among them, the controller controls the power supply unit to generate the corresponding first power supply and second power supply according to the required calibration hydrogen and calibration oxygen in advance, so the controller can determine the proportion of hydrogen and oxygen in the hydrogen and oxygen mixed gas delivered to the target hydrogen and oxygen sensor. When the target detection signal fed back by the target hydrogen and oxygen sensor is obtained, the proportion of hydrogen and oxygen in the hydrogen and oxygen mixed gas detected by the target hydrogen and oxygen sensor can be determined according to the target detection signal. By comparing the two, it can be obtained whether the detection result of the target hydrogen and oxygen sensor is correct and how much deviation exists, which is used as the calibration result. The target hydrogen and oxygen sensor can be adjusted according to the calibration result to achieve complete calibration.

[0067] Through the calibration system of the hydrogen and oxygen sensor, a controlled power supply unit is used, so that the power supply unit outputs the first power supply and the second power supply for electrolysis to the hydrogen electrolyzer and the oxygen electrolyzer respectively according to demand under the control of the controller, so that the hydrogen electrolyzer and the oxygen electrolyzer produce corresponding amounts of calibration hydrogen and calibration oxygen, which are finally mixed in the hydrogen and oxygen mixing tank. In this process, the calibration hydrogen and calibration oxygen are generated in real time by electrolysis, without the need for pre-storage, and the accuracy will not be affected by long-term storage; in addition, the hydrogen electrolyzer is directly arranged in the hydrogen and oxygen mixing tank, and the calibration hydrogen generated by electrolysis is directly stored in the hydrogen and oxygen mixing tank, which reduces the difficulty of mixing and improves the efficiency of mixing.

[0068] In one embodiment, the first sub-power supply unit includes a first drive circuit and a first power circuit, the controlled end of the first drive circuit is electrically connected to the first output end of the controller, the driving end of the first drive circuit is electrically connected to the controlled end of the first power circuit, the input end of the first power circuit is used to connect to the initial power supply, and the output end of the first power circuit is electrically connected to the power supply end of the hydrogen electrolyzer.

[0069] Among them, the first power circuit is used to control the on-off of the line between the initial power supply and the hydrogen electrolyzer. The first power circuit usually uses multiple power devices to implement the corresponding control function, which requires multiple drive signals, and the number of signals directly output by the controller is usually small, which requires a corresponding drive circuit to realize the transmission of drive control. In addition, in some scenarios, the first power circuit usually corresponds to a high-voltage environment, which requires a relatively high-voltage drive signal to achieve drive, while the controller usually corresponds to a low-voltage environment, which can only output a relatively low-voltage signal, which makes the drive circuit also play the function of drive amplification.

[0070] In one embodiment, the second sub-power supply unit includes a second drive circuit and a second power circuit, the controlled end of the second drive circuit is electrically connected to the second output end of the controller, the driving end of the second drive circuit is electrically connected to the controlled end of the second power circuit, the input end of the second power circuit is used to connect to the initial power supply, and the output end of the second power circuit is electrically connected to the power supply end of the oxygen electrolyzer.

[0071] The second power circuit and the second drive circuit are similar, and the specific details can refer to the above-mentioned first power circuit and the first drive circuit.

[0072] like Figure 2 As shown, in one embodiment, the first power circuit includes a first NMOS transistor Q12, a second NMOS transistor Q13, a first inductor L6 and a power relay RELAY1.

[0073] Among them, the gate of the first NMOS tube Q12 is electrically connected to the first driving end of the first driving circuit to access the driving signal H_MOS1, the gate of the second NMOS tube Q13 is electrically connected to the second driving end of the first driving circuit to access the driving signal L_MOS1, the drain of the first NMOS tube Q12 is used to be electrically connected to the initial power supply to access the voltage signal VIN, the source of the first NMOS tube Q12 is electrically connected to the drain of the second NMOS tube Q13 and the first end of the first inductor L6 respectively, the source of the second NMOS tube Q13 is used to be grounded, the second end of the first inductor L6 is electrically connected to the first access end of the power relay RELAY1, the second access end of the power relay RELAY1 is electrically connected to the power supply end of the hydrogen electrolyzer to output the voltage signal VOUT2+, and the controlled end of the power relay RELAY1 is electrically connected to the first driving end of the controller to access the driving signal RELAY_ON1.

[0074] When the first NMOS tube Q12 is turned on but the second NMOS tube Q13 is turned off, the first inductor L6 is charged. When the first NMOS tube Q12 is turned off but the second NMOS tube Q13 is turned on, the first inductor L6 is discharged. The charging and discharging of the first inductor L6 is used to realize the output of voltage. The magnitude of the output voltage depends on the conduction duty ratio of the first NMOS tube Q12 and the second NMOS tube Q13. For example, Figure 2 As shown, the duty cycle of the driving signal H_MOS1 driving the first NMOS transistor Q12 is D1, and the duty cycle of the driving signal L_MOS1 driving the second NMOS transistor Q13 is 1-D1. When D1 takes a positive value near 0.5, ultra-low voltage output can be achieved.

[0075] When the output voltage signal VOUT2+ is required, the controller may send a low-level driving signal RELAY_ON1 to turn on the power relay RELAY1 .

[0076] like Figure 3 As shown, in one embodiment, the second power circuit includes a transistor Q9, an optocoupler U3, a first PMOS tube Q1, a second PMOS tube Q6, a first resistor R14, a second resistor R3, a third NMOS tube Q2, a fourth NMOS tube Q3, a fifth NMOS tube Q10, a sixth NMOS tube Q11, a second inductor L2, a seventh NMOS tube Q4, an eighth NMOS tube Q7, a ninth NMOS tube Q5 and a tenth NMOS tube Q8.

[0077] Among them, the base of the transistor Q9 is electrically connected to the second driving end of the controller to access the driving signal MCU_PMOS_ON, the emitter of the transistor Q9 is used for grounding, the collector of the transistor Q9 is connected in series with the light-emitting diode in the optocoupler U3, the emitter of the photosensitive transistor Q9 in the optocoupler U3 is grounded, and the collector of the photosensitive transistor Q9 in the optocoupler U3 is electrically connected to the gate of the first PMOS tube Q1, the first end of the first resistor R14, the gate of the second PMOS tube Q6 and the first end of the second resistor R3, respectively, and the drain of the first PMOS tube Q1 and the drain of the second PMOS tube Q6 are respectively used to be electrically connected to the initial power supply to access the voltage signal PVIN.

[0078] Among them, the source of the first PMOS transistor Q1, the second end of the first resistor R14, the source of the second PMOS transistor Q6, and the second end of the second resistor R3 are electrically connected to the drain of the third NMOS transistor Q2 and the drain of the fourth NMOS transistor Q3, respectively; the source of the third NMOS transistor Q2 and the source of the fourth NMOS transistor Q3 are electrically connected to the drain of the fifth NMOS transistor Q10, the drain of the sixth NMOS transistor Q11, and the first end of the second inductor L2, respectively; the source of the fifth NMOS transistor Q10 and the source of the sixth NMOS transistor Q11 are used for grounding, respectively.

[0079] Among them, the gate of the third NMOS tube Q2 is electrically connected to the first driving end of the second driving circuit to access the driving signal MOS_PWM1A_1; the gate of the fourth NMOS tube Q3 is electrically connected to the second driving end of the second driving circuit to access the driving signal MOS_PWM1A_2; the gate of the fifth NMOS tube Q10 is electrically connected to the third driving end of the second driving circuit to access the driving signal MOS_PWM1B_1; the gate of the sixth NMOS tube Q11 is electrically connected to the fourth driving end of the second driving circuit to access the driving signal MOS_PWM1B_2.

[0080] The second end of the second inductor L2 is electrically connected to the drain of the seventh NMOS tube Q4 and the drain of the eighth NMOS tube Q7, respectively; the source of the seventh NMOS tube Q4 is electrically connected to the source of the ninth NMOS tube Q5; the source of the eighth NMOS tube Q7 is electrically connected to the source of the tenth NMOS tube Q8; the drain of the ninth NMOS tube Q5 and the drain of the tenth NMOS tube Q8 are electrically connected to the power supply end of the oxygen electrolyzer, respectively, to output the voltage signal VOUT1+; the gate of the seventh NMOS tube Q4, the gate of the eighth NMOS tube Q7, the gate of the ninth NMOS tube Q5 and the gate of the tenth NMOS tube Q8 are electrically connected to the third driving end of the controller, respectively, to access the driving signal MOS_ON.

[0081] When the third NMOS tube Q2 and the fourth NMOS tube Q3 are turned on but the fifth NMOS tube Q10 and the sixth NMOS tube Q11 are turned off, the second inductor L2 is charged. When the third NMOS tube Q2 and the fourth NMOS tube Q3 are turned off but the fifth NMOS tube Q10 and the sixth NMOS tube Q11 are turned on, the second inductor L2 is charged. The voltage output is realized by using the charging and discharging of the second inductor L2. The magnitude of the output voltage depends on the conduction duty ratio of the third NMOS tube Q2, the fourth NMOS tube Q3, the fifth NMOS tube Q10 and the sixth NMOS tube Q11. For example, Figure 3 As shown, the duty ratio of the driving signal MOS_PWM1A_1 driving the third NMOS transistor Q2 and the driving signal MOS_PWM1A_2 driving the fourth NMOS transistor Q3 is D, and the duty ratio of the driving signal MOS_PWM1B_1 driving the fifth NMOS transistor Q10 and the driving signal MOS_PWM1B_2 driving the sixth NMOS transistor Q11 is 1-D. When D takes a positive value near 0.5, ultra-low voltage output can be achieved.

[0082] When the voltage signal PVIN needs to be connected, the controller can send a high-level driving signal MCU_PMOS_ON to turn on the transistor Q9, and then the optocoupler U3 is turned on, thereby turning on the first PMOS tube Q1 and the second PMOS tube Q6.

[0083] When the output voltage signal VOUT1+ is required, the controller may send a high-level driving signal MOS_ON to turn on the seventh NMOS transistor Q4 and the eighth NMOS transistor Q7.

[0084] Among them, the ninth NMOS transistor Q5 and the tenth NMOS transistor Q10 which are connected in reverse series with the seventh NMOS transistor Q4 and the eighth NMOS transistor Q7 can play a role in preventing reverse flow.

[0085] In summary, the circuit composed of the first PMOS transistor Q1, the third NMOS transistor Q2, the ninth NMOS transistor Q7, the tenth NMOS transistor Q8, etc. can realize functions such as charge and discharge voltage matching control, reverse connection protection, and current backflow.

[0086] like Figure 1 As shown, in one embodiment, the oxygen processing unit includes an oxygen-water vapor separation subunit and an oxygen drying subunit.

[0087] The input port of the oxygen-water vapor separation subunit is connected to the oxygen electrolyzer, the output port of the oxygen-water vapor separation subunit is connected to the input port of the oxygen drying subunit, and the output port of the oxygen drying subunit is connected to the hydrogen-oxygen mixing tank.

[0088] Among them, the oxygen-water vapor separation subunit is used for preliminary separation of oxygen and water vapor, the oxygen drying subunit is used for complete separation of oxygen and water vapor, and the calibrated oxygen output by the oxygen-water vapor separation subunit enters the hydrogen-oxygen mixing tank through the gas valve controlled by the controller.

[0089] like Figure 1 As shown, in one embodiment, the calibration system of the hydrogen and oxygen sensor also includes a water replenishment tank, a heating and temperature control water tank, a temperature sensor, a first water storage tank, a first water pump, a second water storage tank, a second water pump, a first speed sensor (not shown in the figure) and a second speed sensor (not shown in the figure).

[0090] The output port of the water replenishment tank is connected to the input port of the heating and temperature-controlling water tank, the output port of the heating and temperature-controlling water tank is respectively connected to the input port of the first water storage tank and the input port of the second water storage tank, the output port of the first water storage tank is connected to the hydrogen electrolyzer, and the output port of the second water storage tank is connected to the oxygen electrolyzer. The temperature sensor is arranged in the heating and temperature-controlling water tank and is electrically connected to the controller, the first water pump is arranged in the first water storage tank and is electrically connected to the controller, and the first speed sensor and the second speed sensor are respectively electrically connected to the controller.

[0091] The controller is used to control the heating of the heating temperature-controlled water tank according to the temperature signal fed back by the temperature sensor.

[0092] Among them, a water source with a suitable temperature can improve the electrolysis efficiency.

[0093] The controller is used to control the speed of the first water pump according to the first speed signal of the first water pump fed back by the first speed sensor, so as to output the first water source to the hydrogen electrolyzer according to the stored water source in the first water storage tank.

[0094] Among them, the first speed signal detected by the first water pump serves as feedback for the controller to control the first water pump, so that the controller can control the speed of the first water pump according to the water demand, and then transport the first water source of the corresponding water volume to the hydrogen electrolyzer.

[0095] The controller is used to control the speed of the second water pump according to the second speed signal of the second water pump fed back by the second speed sensor, so as to output the second water source to the oxygen electrolyzer according to the stored water source in the second water storage tank.

[0096] Among them, the second speed signal detected by the second water pump serves as feedback for the controller to control the second water pump, so that the controller can control the speed of the second water pump according to the water demand, and then transport the second water source of the corresponding amount of water to the oxygen electrolysis tank.

[0097] like Figure 4 As shown, in one embodiment, the output wire group of the temperature sensor adopts a four-wire system.

[0098] Among them, the core of the temperature sensor is RTD (platinum resistance temperature sensor), which uses RTD's ability to sense temperature to achieve temperature detection.

[0099] like Figure 1 As shown, in one embodiment, the calibration system of the hydrogen and oxygen sensor further includes an analog quantity acquisition unit and an analog-to-digital conversion unit.

[0100] Among them, the input end of the analog quantity acquisition unit is electrically connected to the target hydrogen and oxygen sensor, the temperature sensor, the first speed sensor and the second speed sensor respectively, the output end of the analog quantity acquisition unit is electrically connected to the input end of the analog-to-digital conversion unit, and the output end of the analog-to-digital conversion unit is electrically connected to the input end of the controller.

[0101] Among them, since the signals collected by each sensor are analog quantities, an analog quantity collection unit is required to realize the collection, and an analog-to-digital conversion unit is used to realize the conversion so that it can be processed by the controller.

[0102] like Figure 5 As shown, in one embodiment, the analog quantity acquisition unit includes a temperature analog quantum acquisition unit, and the temperature analog quantum acquisition unit includes a first operational amplifier U21A, a second operational amplifier U21B and a third PMOS tube Q19.

[0103] Among them, the inverting input terminal of the first operational amplifier U21A and the source of the third PMOS tube Q19 are respectively used to access the working voltage (such as the working voltage of +5VA), the non-inverting input terminal of the first operational amplifier U21A is used to access the reference voltage (such as the reference voltage of +2.5V), the output terminal of the first operational amplifier U21A is electrically connected to the gate of the third PMOS tube Q19, the non-inverting input terminal of the second operational amplifier U21B is respectively electrically connected to the drain of the third PMOS tube Q19, the first line of the temperature sensor (such as pin 1 of the terminal J4) and the second line of the temperature sensor (such as pin 2 of the terminal J4), the inverting input terminal of the second operational amplifier U21B is respectively electrically connected to the third line of the temperature sensor (such as pin 3 of the terminal J4) and the fourth line of the temperature sensor (such as pin 4 of the terminal J4), and the output terminal of the second operational amplifier is electrically connected to the analog-to-digital conversion unit to output the temperature analog signal TEMP_SENSE.

[0104] Reference Figure 4 and Figure 5, the 2.5VREF precision reference voltage source is realized through the first operational amplifier U21A to form a constant voltage source, and the constant voltage source forms a constant current source through the third PMOS tube Q19 and RTD to eliminate the line resistance error corresponding to the 4-wire RTD. The second U21B is a high input impedance operational amplifier, and the excitation current flows through the first line, RTD and the fourth line. Since no current flows through the second line and the third line, the digital-to-analog conversion unit can accurately measure the voltage of the RTD in the temperature sensor. In the figure, the four-wire system only needs to configure one excitation source to achieve the purpose of eliminating the line group error.

[0105] like Figure 6 As shown, in one embodiment, the analog quantity acquisition unit includes a rotation speed analog quantum acquisition unit, and the rotation speed analog quantum acquisition unit includes a third operational amplifier U22A, a fourth operational amplifier U22B, a fifth operational amplifier U23A and a sixth operational amplifier U23B.

[0106] in, Figure 6 Terminal J7 in is used for electrical connection with the speed sensor.

[0107] Among them, the output end of the third operational amplifier U22A is electrically connected to the analog-to-digital conversion unit to output the speed analog signal AIN1_SENSE; the output end of the fifth operational amplifier U23A is electrically connected to the analog-to-digital conversion unit to output the speed analog signal AIN2_SENSE.

[0108] like Figure 7 As shown, in one embodiment, the analog quantity acquisition unit includes a liquid level analog quantity acquisition unit, and the liquid level analog quantity acquisition unit includes an optical coupler U25, an optical coupler U26, an optical coupler U27, an optical coupler U28, and an optical coupler U29.

[0109] in, Figure 7 Terminal J6 in is used for electrical connection with the liquid level sensor.

[0110] Among them, the output end of the optocoupler U25 is electrically connected to the controller to output the liquid level digital signal MCU_EXTI1; the output end of the optocoupler U26 is electrically connected to the controller to output the liquid level digital signal MCU_EXTI2; the output end of the optocoupler U27 is electrically connected to the controller to output the liquid level digital signal MCU_EXTI3; the output end of the optocoupler U28 is electrically connected to the controller to output the liquid level digital signal MCU_EXTI4; the output end of the optocoupler U29 is electrically connected to the controller to output the liquid level digital signal MCU_EXTI5.

[0111] like Figure 1 As shown, in one embodiment, the calibration system of the hydrogen and oxygen sensors further includes a vacuum control unit.

[0112] The vacuum control unit is electrically connected to the controller and is used to vacuum the hydrogen-oxygen mixing tank before the calibrated hydrogen and calibrated oxygen appear in the hydrogen-oxygen mixing tank under the control of the controller.

[0113] The above is a detailed introduction to a calibration system for a hydrogen and oxygen sensor provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

[0114] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A calibration system for a hydrogen and oxygen sensor, characterized in that: The calibration system of the hydrogen and oxygen sensor includes a hydrogen electrolyzer, an oxygen electrolyzer, an oxygen processing unit, a power supply unit, a hydrogen and oxygen mixing tank and a controller; The output end of the controller is electrically connected to the controlled end of the power supply unit, the input end of the controller is used to be electrically connected to the output end of the target hydrogen and oxygen sensor to be calibrated, the power supply end of the hydrogen electrolyzer is electrically connected to the first output end of the power supply unit, the power supply end of the oxygen electrolyzer is electrically connected to the second output end of the power supply unit, the hydrogen electrolyzer is arranged in the hydrogen and oxygen mixing tank, and the oxygen electrolyzer is connected to the hydrogen and oxygen mixing tank through the oxygen processing unit; The controller is used to output a power control signal to the power supply unit, so that the power supply unit outputs a first power supply to the hydrogen electrolyzer and outputs a second power supply to the oxygen electrolyzer; The hydrogen electrolyzer is used to electrolyze the first power source input and the first water source connected to obtain calibrated hydrogen; The oxygen electrolyzer is used to electrolyze the second power supply input and the second water source connected to obtain calibrated oxygen; The hydrogen-oxygen mixing tank is used to mix the calibration hydrogen gas inside the tank with the calibration oxygen gas connected through the oxygen processing unit to obtain a hydrogen-oxygen mixed gas and transport it to the target hydrogen-oxygen sensor, so that the target hydrogen-oxygen sensor performs calibration detection and feeds back a target detection signal to the controller; The controller is also used to obtain a calibration result according to the output power control signal and the input target detection signal.

2. The calibration system for hydrogen and oxygen sensors according to claim 1, characterized in that: The power supply unit comprises a first sub-power supply unit and a second sub-power supply unit; The controlled end of the first sub-power supply unit is electrically connected to the first output end of the controller, and the output end of the first sub-power supply unit is electrically connected to the power supply end of the hydrogen electrolyzer, and is used to output the first power supply to the hydrogen electrolyzer according to the first control signal output by the controller; The controlled end of the second sub-power supply unit is electrically connected to the second output end of the controller, and the output end of the second sub-power supply unit is electrically connected to the power supply end of the oxygen electrolyzer, and is used to output the second power supply to the oxygen electrolyzer according to the second control signal output by the controller; The power control signal includes a first control signal and a second control signal.

3. The calibration system for hydrogen and oxygen sensors according to claim 2, characterized in that: The first sub-power supply unit includes a first drive circuit and a first power circuit, and the second sub-power supply unit includes a second drive circuit and a second power circuit; The controlled end of the first drive circuit is electrically connected to the first output end of the controller, the driving end of the first drive circuit is electrically connected to the controlled end of the first power circuit, the input end of the first power circuit is used to connect to the initial power supply, and the output end of the first power circuit is electrically connected to the power supply end of the hydrogen electrolyzer; The controlled end of the second drive circuit is electrically connected to the second output end of the controller, the driving end of the second drive circuit is electrically connected to the controlled end of the second power circuit, the input end of the second power circuit is used to connect to the initial power supply, and the output end of the second power circuit is electrically connected to the power supply end of the oxygen electrolyzer.

4. The calibration system for hydrogen and oxygen sensors according to claim 3, characterized in that: The first power circuit includes a first NMOS transistor, a second NMOS transistor, a first inductor and a power relay; The gate of the first NMOS tube is electrically connected to the first driving end of the first driving circuit, the gate of the second NMOS tube is electrically connected to the second driving end of the first driving circuit, the drain of the first NMOS tube is used to be electrically connected to the initial power supply, the source of the first NMOS tube is electrically connected to the drain of the second NMOS tube and the first end of the first inductor respectively, the source of the second NMOS tube is used to be grounded, the second end of the first inductor is electrically connected to the first access end of the power relay, the second access end of the power relay is electrically connected to the power supply end of the hydrogen electrolyzer, and the controlled end of the power relay is electrically connected to the first driving end of the controller.

5. The calibration system for hydrogen and oxygen sensors according to claim 3, characterized in that: The second power circuit includes a triode, an optocoupler, a first PMOS tube, a second PMOS tube, a first resistor, a second resistor, a third NMOS tube, a fourth NMOS tube, a fifth NMOS tube, a sixth NMOS tube, a second inductor, a seventh NMOS tube, an eighth NMOS tube, a ninth NMOS tube and a tenth NMOS tube; The base of the transistor is electrically connected to the second driving end of the controller, the emitter of the transistor is used for grounding, the collector of the transistor is connected in series with the light-emitting diode in the optocoupler, the emitter of the photosensitive transistor in the optocoupler is grounded, the collector of the photosensitive transistor in the optocoupler is electrically connected to the gate of the first PMOS tube, the first end of the first resistor, the gate of the second PMOS tube and the first end of the second resistor respectively, and the drain of the first PMOS tube and the drain of the second PMOS tube are used for electrically connecting to the initial power supply respectively; The source of the first PMOS tube, the second end of the first resistor, the source of the second PMOS tube and the second end of the second resistor are electrically connected to the drain of the third NMOS tube and the drain of the fourth NMOS tube respectively, the source of the third NMOS tube and the source of the fourth NMOS tube are electrically connected to the drain of the fifth NMOS tube, the drain of the sixth NMOS tube and the first end of the second inductor respectively, the source of the fifth NMOS tube and the source of the sixth NMOS tube are used for grounding respectively, the gate of the third NMOS tube is electrically connected to the first driving end of the second driving circuit, the gate of the fourth NMOS tube is electrically connected to the second driving end of the second driving circuit, the gate of the fifth NMOS tube is electrically connected to the third driving end of the second driving circuit, and the gate of the sixth NMOS tube is electrically connected to the fourth driving end of the second driving circuit; The second end of the second inductor is electrically connected to the drain of the seventh NMOS tube and the drain of the eighth NMOS tube respectively, the source of the seventh NMOS tube is electrically connected to the source of the ninth NMOS tube, the source of the eighth NMOS tube is electrically connected to the source of the tenth NMOS tube, the drain of the ninth NMOS tube and the drain of the tenth NMOS tube are electrically connected to the power supply terminal of the oxygen electrolyzer respectively, and the gate of the seventh NMOS tube, the gate of the eighth NMOS tube, the gate of the ninth NMOS tube and the gate of the tenth NMOS tube are electrically connected to the third driving terminal of the controller respectively.

6. The calibration system for hydrogen and oxygen sensors according to claim 1, characterized in that: The oxygen processing unit includes an oxygen-water vapor separation subunit and an oxygen drying subunit; The input port of the oxygen-water vapor separation subunit is connected to the oxygen electrolysis cell, the output port of the oxygen-water vapor separation subunit is connected to the input port of the oxygen drying subunit, and the output port of the oxygen drying subunit is connected to the hydrogen-oxygen mixing tank.

7. The calibration system for hydrogen and oxygen sensors according to claim 1, characterized in that: The calibration system of the hydrogen and oxygen sensor also includes a water supply tank, a heating and temperature control water tank, a temperature sensor, a first water storage tank, a first water pump, a second water storage tank, a second water pump, a first speed sensor and a second speed sensor; The output port of the water replenishment tank is communicated with the input port of the heating and temperature-controlling water tank, the output port of the heating and temperature-controlling water tank is communicated with the input port of the first water storage tank and the input port of the second water storage tank respectively, the output port of the first water storage tank is communicated with the hydrogen electrolyzer, and the output port of the second water storage tank is communicated with the oxygen electrolyzer; The temperature sensor is arranged in the heating temperature-control water tank and is electrically connected to the controller, the first water pump is arranged in the first water storage tank and is electrically connected to the controller, and the first speed sensor and the second speed sensor are electrically connected to the controller respectively; The controller is used to control the heating of the heating and temperature-controlled water tank according to the temperature signal fed back by the temperature sensor; The controller is used to control the speed of the first water pump according to the first speed signal of the first water pump fed back by the first speed sensor, so as to output the first water source to the hydrogen electrolyzer according to the stored water source in the first water storage tank; The controller is used to control the speed of the second water pump according to the second speed signal of the second water pump fed back by the second speed sensor, so as to output the second water source to the oxygen electrolyzer according to the stored water source in the second water storage tank.

8. The calibration system for hydrogen and oxygen sensors according to claim 7, characterized in that: The output wire group of the temperature sensor adopts a four-wire system.

9. The calibration system for hydrogen and oxygen sensors according to claim 8, characterized in that: The calibration system of the hydrogen and oxygen sensor also includes an analog quantity acquisition unit and an analog-to-digital conversion unit; The input end of the analog quantity acquisition unit is electrically connected to the target hydrogen and oxygen sensor, the temperature sensor, the first speed sensor and the second speed sensor respectively, the output end of the analog quantity acquisition unit is electrically connected to the input end of the analog-to-digital conversion unit, and the output end of the analog-to-digital conversion unit is electrically connected to the input end of the controller.

10. The calibration system for hydrogen and oxygen sensors according to claim 9, characterized in that: The analog quantity acquisition unit includes a temperature simulation quantum acquisition unit, and the temperature simulation quantum acquisition unit includes a first operational amplifier, a second operational amplifier and a third PMOS tube; The inverting input terminal of the first operational amplifier and the source of the third PMOS tube are respectively used to access the working voltage, the non-inverting input terminal of the first operational amplifier is used to access the reference voltage, the output terminal of the first operational amplifier is electrically connected to the gate of the third PMOS tube, the non-inverting input terminal of the second operational amplifier is respectively electrically connected to the drain of the third PMOS tube, the first line of the temperature sensor and the second line of the temperature sensor, the inverting input terminal of the second operational amplifier is respectively electrically connected to the third line of the temperature sensor and the fourth line of the temperature sensor, and the output terminal of the second operational amplifier is electrically connected to the analog-to-digital conversion unit.

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