Hydrogen ion detection circuit and detection system of hydrogen fuel cell electrolyzer

Abstract

The present invention provides a hydrogen ion detection circuit and a detection system for a hydrogen fuel cell electrolyzer. The hydrogen ion detection circuit includes a hydrogen ion sensitive field effect transistor, a constant current source drive circuit, and a current limiting resistor; the drain of the hydrogen ion sensitive field effect transistor is electrically connected to the output end of the constant current source drive circuit to access the constant current source drive signal output by the constant current source drive circuit, the source of the hydrogen ion sensitive field effect transistor is electrically connected to the first end of the current limiting resistor, and the second end of the current limiting resistor is grounded; the gate of the hydrogen ion sensitive field effect transistor is used to access the bias drive voltage signal output by the control unit; the hydrogen ion sensitive field effect transistor is used to be arranged in the hydrogen fuel cell electrolyzer to feed back the corresponding gate-source voltage signal to the control unit according to the concentration of hydrogen ions in the hydrogen fuel cell electrolyzer. With the hydrogen ion sensitive field effect transistor as the core component, the corresponding hydrogen ion concentration can be determined according to the detected gate-source voltage signal.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a hydrogen ion detection circuit and a detection system for a hydrogen fuel cell electrolyzer. Background Art

[0002] A fuel cell is a device that can convert chemical energy into electrical energy. Its characteristics are high efficiency, environmental protection, and energy saving. With global energy and environmental issues, hydrogen fuel cells are the most promising new generation of green energy. In order to ensure the reliability, stability, and efficiency of hydrogen fuel cells, relevant tests are usually required before leaving the factory or before they are put into use.

[0003] In the prior art, thermal conductivity sensors and optical sensors are usually used to detect hydrogen, but the existing solutions cannot achieve good results when performing hydrogen ion detection. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a hydrogen ion detection circuit and a detection system for a hydrogen fuel cell electrolyzer.

[0005] In a first aspect, in one embodiment, the present invention provides a hydrogen ion detection circuit, the hydrogen ion detection circuit comprising:

[0006] Hydrogen ion sensitive field effect transistor, constant current source drive circuit, current limiting resistor;

[0007] The drain of the hydrogen ion sensitive field effect transistor is electrically connected to the output end of the constant current source driving circuit to receive the constant current source driving signal output by the constant current source driving circuit, the source of the hydrogen ion sensitive field effect transistor is electrically connected to the first end of the current limiting resistor, and the second end of the current limiting resistor is grounded;

[0008] The gate of the hydrogen ion sensitive field effect transistor is used to be electrically connected to the first output terminal of the control unit to access the bias driving voltage signal output by the control unit;

[0009] The gate of the hydrogen ion sensitive field effect transistor is also used to be electrically connected to the first collection terminal of the control unit, and the source of the hydrogen ion sensitive field effect transistor is also used to be electrically connected to the second collection terminal of the control unit;

[0010] The hydrogen ion sensitive field effect transistor is used to be arranged in a hydrogen fuel cell electrolyzer to feed back a corresponding gate-source voltage signal to a control unit according to the concentration of hydrogen ions in the hydrogen fuel cell electrolyzer.

[0011] In one embodiment, the constant current source driving circuit includes a driving amplifier circuit and a first MOS tube;

[0012] The inverting input terminal of the driving amplifier circuit is used to access the first reference voltage signal, the non-inverting input terminal of the driving amplifier circuit is used to access the amplified driving voltage signal, the output terminal of the driving amplifier circuit is electrically connected to the gate of the first MOS tube, the drain of the first MOS tube is connected to the working voltage signal, and the source of the first MOS tube is electrically connected to the drain of the hydrogen ion sensitive field effect transistor.

[0013] In one embodiment, the constant current source driving circuit further includes a comparison circuit, a feedback circuit and a second MOS tube;

[0014] The drain and source of the second MOS tube are respectively connected in series with the drain and source of the hydrogen ion sensitive field effect transistor, the drain and source of the first MOS tube, and the current limiting resistor, the gate of the second MOS tube is electrically connected to the output end of the comparison circuit, the first end of the current limiting resistor is also electrically connected to the non-inverting input end of the feedback circuit, the inverting input end of the feedback circuit is respectively electrically connected to the output end of the feedback circuit and the inverting input end of the comparison circuit, and the non-inverting input end of the comparison circuit is used to access the second reference voltage signal.

[0015] In one embodiment, the inverting input terminal of the driving amplifier circuit is electrically connected to the output terminal of the feedback circuit and the inverting input terminal of the comparison circuit respectively, so as to use the feedback voltage signal output by the feedback circuit as the first reference voltage signal;

[0016] The amplified driving voltage signal connected to the non-inverting input terminal of the driving amplifier circuit is greater than the second reference voltage signal connected to the non-inverting input terminal of the comparison circuit.

[0017] In one embodiment, the non-inverting input terminal of the driving amplifier circuit is used to be electrically connected to the second output terminal of the control unit to receive the amplified driving voltage signal output by the control unit.

[0018] In one embodiment, a detection system for a hydrogen fuel cell electrolyzer includes the hydrogen ion detection circuit and the control unit in any one of the above embodiments.

[0019] In one embodiment, two hydrogen ion detection circuits are provided, and the two hydrogen ion detection circuits serve as an anode hydrogen ion detection circuit and a cathode hydrogen ion detection circuit respectively;

[0020] The anode hydrogen ion detection circuit is used to be arranged at the anode in the hydrogen fuel cell electrolyzer to feed back the corresponding anode gate-source voltage signal to the control unit according to the concentration of hydrogen ions at the anode in the hydrogen fuel cell electrolyzer;

[0021] The cathode hydrogen ion detection circuit is used to be arranged at the cathode in the hydrogen fuel cell electrolyzer, so as to feed back the corresponding cathode gate-source voltage signal to the control unit according to the concentration of hydrogen ions at the cathode in the hydrogen fuel cell electrolyzer;

[0022] The control unit is used to perform hydrogen ion penetration detection on the hydrogen fuel cell electrolyzer according to the anode gate-source voltage signal and the cathode gate-source voltage signal.

[0023] In one embodiment, the detection system of the hydrogen fuel cell electrolyzer further includes an impedance detection circuit;

[0024] The impedance detection circuit includes an adding circuit, a resistive amplifier circuit, and an impedance amplitude-frequency circuit;

[0025] The first input terminal of the adding circuit is used to access the first excitation source to be mixed, and the second input terminal of the adding circuit is used to access the second excitation source to be mixed;

[0026] The output end of the adding circuit is used to be electrically connected to the anode of the hydrogen fuel cell electrolyzer to output the target mixed excitation source to the anode of the hydrogen fuel cell electrolyzer;

[0027] The input end of the resistive amplifier circuit is used to be electrically connected to the cathode of the hydrogen fuel cell electrolyzer to access the AC impedance signal output by the cathode of the hydrogen fuel cell electrolyzer, the output end of the resistive amplifier circuit is electrically connected to the input end of the impedance amplitude-frequency circuit, and the output end of the impedance amplitude-frequency circuit is electrically connected to the third acquisition end of the control unit.

[0028] In one embodiment, the impedance detection circuit further includes a first differential amplifier circuit and a second differential amplifier circuit;

[0029] The input end of the first differential amplifier circuit is used to access the first initial excitation source, and the output end of the first differential amplifier circuit is electrically connected to the first input end of the adding circuit to output the first excitation source to be mixed to the first input end of the adding circuit;

[0030] The input end of the second differential amplifier circuit is used to access the second initial excitation source, and the output end of the second differential amplifier circuit is electrically connected to the second input end of the adding circuit to output the second excitation source to be mixed to the second input end of the adding circuit.

[0031] In one embodiment, the control unit includes a single chip microcomputer.

[0032] Through the above-mentioned hydrogen ion detection circuit and the detection system of the hydrogen fuel cell electrolyzer, with the hydrogen ion sensitive field effect transistor as the core component, the hydrogen ion sensitive field effect transistor can produce a change in channel width as the hydrogen ion concentration changes, thereby generating a change in the induced voltage between the gate and the source, and finally enabling the corresponding control unit to determine the corresponding hydrogen ion concentration according to the detected gate-source voltage signal; in addition, the constant current source drive circuit is used to drive the hydrogen ion sensitive field effect transistor with a constant current, which can ensure the accuracy of the hydrogen ion sensitive field effect transistor detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 It is a structural schematic diagram of a hydrogen ion detection circuit in one embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of a hydrogen ion sensitive field effect transistor in one embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of a constant current source driving circuit in one embodiment of the present invention;

[0037] Figure 4 A schematic diagram of a specific structure of a constant current source driving circuit in one embodiment of the present invention;

[0038] Figure 5 It is a structural schematic diagram of a detection system for a hydrogen fuel cell electrolyzer in one embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the structure of an impedance detection circuit in one embodiment of the present invention;

[0040] Figure 7 It is a schematic diagram of the structure of an adding circuit and a resistive amplifier circuit in one embodiment of the present invention;

[0041] Figure 8 FIG. 4 is a schematic diagram of the structure of a first differential amplifier circuit in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] First, as Figure 1 As shown, in one embodiment, the present invention provides a hydrogen ion detection circuit, which includes a hydrogen ion sensitive field effect transistor Q1, a constant current source drive circuit, and a current limiting resistor Rsense1.

[0045] The drain of the hydrogen ion sensitive field effect transistor Q1 is electrically connected to the output end of the constant current source driving circuit to access the constant current source driving signal output by the constant current source driving circuit, and the source of the hydrogen ion sensitive field effect transistor Q1 is electrically connected to the first end of the current limiting resistor Rsense1, and the second end of the current limiting resistor Rsense1 is grounded.

[0046] Among them, the constant current source driving signal output by the constant current source driving circuit is used to input into the drain of the hydrogen ion sensitive field effect transistor Q1, then flows through the hydrogen ion sensitive field effect transistor Q1, flows out from the source of the hydrogen ion sensitive field effect transistor Q1, and finally passes through the current limiting resistor Rsense1 to the ground, thereby providing driving current for the hydrogen ion sensitive field effect transistor Q1, so that it can work normally.

[0047] The gate of the hydrogen ion sensitive field effect transistor Q1 is used to be electrically connected to the first output terminal of the control unit to access the bias driving voltage signal REF+ output by the control unit.

[0048] The bias driving voltage signal REF+ connected to the gate of the hydrogen ion sensitive field effect transistor Q1 can make its bias voltage reach the turn-on voltage, thereby turning it on.

[0049] The gate of the hydrogen ion sensitive field effect transistor Q1 is also used to be electrically connected to the first collection terminal of the control unit to output a first detection voltage signal AIN+ to the control unit, and the source of the hydrogen ion sensitive field effect transistor Q1 is also used to be electrically connected to the second collection terminal of the control unit to output a second detection voltage signal AIN- to the control unit.

[0050] The hydrogen ion sensitive field effect transistor Q1 is used to be arranged in the hydrogen fuel cell electrolyzer to feed back a corresponding gate-source voltage signal to the control unit according to the concentration of hydrogen ions in the hydrogen fuel cell electrolyzer.

[0051] Among them, the above steps have mentioned that the gate and source of the hydrogen ion sensitive field effect transistor Q1 output the first detection voltage signal AIN+ and the second detection voltage signal AIN- to the control unit respectively, and the difference between the first detection voltage signal AIN+ and the second detection voltage signal AIN- represents the induced voltage between the gate and the source of the hydrogen ion sensitive field effect transistor Q1, that is, the gate-source voltage signal.

[0052] Among them, Figure 2 As shown, the hydrogen ion sensitive field effect transistor Q1 includes a substrate, a channel, a gate insulating layer, an H+ hydrogen sensitive material coating, an inductive contact area, a reference electrode (i.e., a gate), a source and a drain. The constant current source driving circuit, as an adjustable constant current source, sends a corresponding constant current source driving signal to the drain of the hydrogen ion sensitive field effect transistor Q1, and returns from the source of the hydrogen ion sensitive field effect transistor Q1 to form a current loop. In this process, after the inductive contact area on the H+ hydrogen sensitive material coating of the hydrogen ion sensitive field effect transistor Q1 contacts the hydrogen ions, the channel width of the hydrogen ion sensitive field effect transistor Q1 changes, so that a corresponding inductive voltage can be generated between the gate and the source of the hydrogen ion sensitive field effect transistor Q1, and the magnitude of the generated inductive voltage is related to the hydrogen ion concentration contacted by the inductive contact area. In the subsequent process, the control unit can calculate different hydrogen ion concentration values ​​according to the detected gate-source voltage signal and the physical properties of the corresponding semiconductor device.

[0053] Among them, Figure 1 In the embodiment, the resistor R16 and the capacitor C18 are used as a low-pass filter circuit for the first detection voltage signal AIN+, and the resistor R19 and the capacitor C21 are used as a low-pass filter circuit for the second detection voltage signal AIN-.

[0054] Through the above hydrogen ion detection circuit, with the hydrogen ion sensitive field effect transistor as the core component, the hydrogen ion sensitive field effect transistor can produce a change in channel width as the hydrogen ion concentration changes, thereby producing a change in the induced voltage between the gate and the source, and finally enabling the corresponding control unit to determine the corresponding hydrogen ion concentration according to the detected gate-source voltage signal; in addition, the constant current source drive circuit is used to drive the hydrogen ion sensitive field effect transistor with a constant current, which can ensure the accuracy of the hydrogen ion sensitive field effect transistor detection.

[0055] like Figure 3 As shown, in one embodiment, the constant current source driving circuit includes a driving amplifier circuit and a first switching element.

[0056] exist Figure 3 In the embodiment, the inverting input terminal of the driving amplifier circuit is used to access the first reference voltage signal VF_1, the non-inverting input terminal of the driving amplifier circuit is used to access the amplified driving voltage signal VIN1+, the output terminal of the driving amplifier circuit is electrically connected to the driving terminal of the first switching element, the first access terminal of the first switching element is connected to the working voltage signal VCC, and the second access terminal of the first switching element is electrically connected to the drain of the hydrogen ion sensitive field effect transistor Q1.

[0057] The driving amplifier circuit controls its output according to the connected amplified driving voltage signal VIN1+, thereby controlling the on-off of the first switch element, thereby controlling the current drive of the hydrogen ion sensitive field effect transistor Q1, and realizing a controllable constant current source. Specifically, when the first switch element is a MOS tube, the driving amplifier circuit can control the output size of the controller according to the connected amplified driving voltage signal VIN1+, thereby controlling the conduction degree of the MOS tube, thereby controlling the size of the current on the hydrogen ion sensitive field effect transistor Q1, and realizing an adjustable constant current source.

[0058] like Figure 3 As shown, in one embodiment, the constant current source driving circuit further includes a comparison circuit, a feedback circuit and a second switching element.

[0059] exist Figure 3 In the embodiment, the first access terminal and the second access terminal of the second switch element are respectively connected in series with the drain and source of the hydrogen ion sensitive field effect transistor Q1, the first access terminal and the second access terminal of the first switch element, and the current limiting resistor Rsense1, the driving end of the second switch element is electrically connected to the output end of the comparison circuit, the first end of the current limiting resistor Rsense1 is also electrically connected to the non-inverting input end of the feedback circuit, the inverting input end of the feedback circuit is respectively electrically connected to the output end of the feedback circuit and the inverting input end of the comparison circuit to output the feedback voltage signal VF, and the non-inverting input end of the comparison circuit is used to access the second reference voltage signal VIN2+.

[0060] The voltage of the feedback voltage signal VF is determined by the current flowing through the hydrogen ion sensitive field effect transistor Q1 and the resistance value of the current limiting resistor Rsense1. When the current is too large, the voltage of the feedback voltage signal VF is greater than the voltage of the second reference voltage signal VIN2+, so that the comparison circuit controls the second switch element to be in an off state, thereby interrupting the driving current of the hydrogen ion sensitive field effect transistor Q1 and realizing overcurrent control.

[0061] like Figure 3 As shown, in one embodiment, the inverting input terminal of the driving amplifier circuit is electrically connected to the output terminal of the feedback circuit and the inverting input terminal of the comparison circuit respectively, so as to use the feedback voltage signal VF output by the feedback circuit as the first reference voltage signal VF_1.

[0062] The amplified driving voltage signal VIN1+ connected to the non-inverting input terminal of the driving amplifier circuit is greater than the second reference voltage signal VIN2+ connected to the non-inverting input terminal of the comparison circuit.

[0063] Among them, under normal circumstances, to achieve adjustable output of the driving amplifier circuit, it is only necessary that the voltage connected to its inverting input terminal is less than the voltage connected to its non-inverting input terminal. Therefore, in this embodiment, the feedback voltage signal VF output by the feedback circuit can be directly used as the first reference voltage signal VF_1. In this case, it is only necessary to ensure that the amplified driving voltage signal VIN1+ is greater than the second reference voltage signal VIN2+ to ensure that when the comparison circuit interrupts the second switching element, the driving amplifier circuit will not interrupt the first switching element at the same time. In other words, the driving amplifier circuit serves as the control basis of the adjustable constant current, and the comparison circuit serves as the control basis of the overcurrent.

[0064] In one embodiment, the non-inverting input terminal of the driving amplifier circuit is used to be electrically connected to the second output terminal of the control unit to receive the amplified driving voltage signal output by the control unit.

[0065] Among them, the above-mentioned embodiment has mentioned that the driving amplifier circuit controls the magnitude of the driving current of the hydrogen ion sensitive field effect transistor based on the connected amplified driving voltage signal. In order to make the adjustment of the amplified driving voltage signal more flexible, it can be directly output by the control unit. The control unit can obtain the real-time driving current on the hydrogen ion sensitive field effect transistor, and thus adjust and control the driving current based on the obtained driving current, and output the amplified driving voltage signal of the corresponding voltage magnitude.

[0066] like Figure 4As shown, the driving amplifier circuit includes an operational amplifier U1, the comparison circuit includes an operational amplifier U5, the feedback circuit includes an operational amplifier U7A, the first switch element includes a first MOS tube Q5, the second switch element includes a second MOS tube Q8, and the inductor L1, the capacitor C1, the inductor L3 and the capacitor C3 are respectively the filter circuits of the positive and negative power supplies of the operational amplifier U1. The gain multiple of the operational amplifier U1 can be set in advance by setting the resistance value of the gain resistor R3. For example, the gain multiple can be set to 1, and the corresponding driving current is Isense1=VIN1+ / Rsense1. Different constant current sources can be obtained by changing the amplified driving voltage signal VIN1+. The current limiting resistor Rsense1 also serves as a current detection resistor, which feeds back to the operational amplifier U7A in the form of voltage. When Rsense1*Isense1 exceeds VIN2+, the second MOS tube Q8 is turned off and the driving current is interrupted. Different driving current overcurrent upper limits can be obtained by setting VIN2+.

[0067] In a second aspect, in one embodiment, a detection system for a hydrogen fuel cell electrolyzer includes a hydrogen ion detection circuit and a control unit in any one of the above embodiments.

[0068] Through the above-mentioned detection system of the hydrogen fuel cell electrolyzer, with the hydrogen ion sensitive field effect transistor as the core component, the hydrogen ion sensitive field effect transistor can produce a change in channel width as the hydrogen ion concentration changes, thereby generating a change in the induced voltage between the gate and the source, and finally enabling the corresponding control unit to determine the corresponding hydrogen ion concentration based on the detected gate-source voltage signal; in addition, the constant current source drive circuit is used to drive the hydrogen ion sensitive field effect transistor with a constant current, which can ensure the accuracy of the hydrogen ion sensitive field effect transistor detection.

[0069] like Figure 5 As shown, in one embodiment, two hydrogen ion detection circuits are provided, and the two hydrogen ion detection circuits serve as an anode hydrogen ion detection circuit and a cathode hydrogen ion detection circuit respectively.

[0070] The anode hydrogen ion detection circuit is used to be arranged at the anode in the hydrogen fuel cell electrolyzer to feed back the corresponding anode gate-source voltage signal to the control unit according to the concentration of hydrogen ions at the anode in the hydrogen fuel cell electrolyzer;

[0071] The cathode hydrogen ion detection circuit is used to be arranged at the cathode in the hydrogen fuel cell electrolyzer, so as to feed back the corresponding cathode gate-source voltage signal to the control unit according to the concentration of hydrogen ions at the cathode in the hydrogen fuel cell electrolyzer;

[0072] The control unit is used to perform hydrogen ion penetration detection on the hydrogen fuel cell electrolyzer according to the anode gate-source voltage signal and the cathode gate-source voltage signal.

[0073] The control unit is electrically connected to the anode hydrogen ion detection circuit and the cathode hydrogen ion detection circuit respectively through an acquisition circuit (such as a high-precision ADC sampling chip).

[0074] The working principle of hydrogen production by electrolysis is that water molecules are first decomposed into oxygen and hydrogen ions (H+) under the catalytic action of the anode catalyst (such as the precious metal iridium catalyst), and then the hydrogen ions pass through the proton exchange membrane between the cathode and the cathode, and then generate hydrogen under the catalysis of the cathode catalyst (such as the precious metal platinum catalyst). The hydrogen produced at the cathode and the oxygen produced at the anode are separated by the proton exchange membrane. Therefore, the control unit can detect the hydrogen ion concentration of the anode of the electrolyzer and the hydrogen ion concentration of the cathode of the electrolyzer respectively, and thus judge the penetration rate and hydrogen ion conversion value of the hydrogen ions in the electrolyzer based on the difference in concentration between the two.

[0075] Among them, Figure 5 A hydrogen sensor may also be included, which is used to detect the hydrogen concentration generated by the cathode of the electrolytic cell and feed it back to the control unit so that the control unit can perform more comprehensive detection and judgment on the electrolytic cell.

[0076] In one embodiment, the detection system for a hydrogen fuel cell electrolyzer further includes an impedance detection circuit.

[0077] like Figure 6 As shown, the impedance detection circuit includes an adding circuit, a resistive amplifier circuit, and an impedance amplitude-frequency circuit.

[0078] The first input terminal of the adding circuit is used to access the first excitation source to be mixed, and the second input terminal of the adding circuit is used to access the second excitation source to be mixed.

[0079] The first excitation source to be mixed and the second excitation source to be mixed are excitation sources of different types. As an example, the first excitation source to be mixed may be a square wave signal, and the second excitation source to be mixed may be a triangle wave signal.

[0080] The output end of the adding circuit is used to be electrically connected to the anode of the hydrogen fuel cell electrolyzer to output the target mixed excitation source to the anode of the hydrogen fuel cell electrolyzer.

[0081] The adding circuit is used to superimpose the two connected excitation sources to obtain the corresponding target mixed excitation source. Mixed frequency excitation can better realize the detection of electrochemical impedance of the electrolytic cell.

[0082] The input end of the resistive amplifier circuit is used to be electrically connected to the cathode of the hydrogen fuel cell electrolyzer to access the AC impedance signal output by the cathode of the hydrogen fuel cell electrolyzer, the output end of the resistive amplifier circuit is electrically connected to the input end of the impedance amplitude-frequency circuit, and the output end of the impedance amplitude-frequency circuit is electrically connected to the third acquisition end of the control unit.

[0083] The resistive amplifier circuit is used to amplify the AC impedance signal output from the cathode of the electrolytic cell. The impedance amplitude-frequency circuit is used to obtain the spectrum of the AC impedance of the electrolytic cell according to the amplified AC impedance signal, and the control unit finally performs impedance analysis and detection according to the spectrum.

[0084] like Figure 6 As shown, in one embodiment, the impedance detection circuit further includes a first differential amplifier circuit and a second differential amplifier circuit.

[0085] The input end of the first differential amplifier circuit is used to access the first initial excitation source, and the output end of the first differential amplifier circuit is electrically connected to the first input end of the adding circuit to output the first excitation source to be mixed to the first input end of the adding circuit.

[0086] The input end of the second differential amplifier circuit is used to access the second initial excitation source, and the output end of the second differential amplifier circuit is electrically connected to the second input end of the adding circuit to output the second excitation source to be mixed to the second input end of the adding circuit.

[0087] like Figure 7 As shown, the adding circuit includes an adder composed of an operational amplifier U17B, which superimposes the first excitation source TRIAN1 to be mixed connected to the resistor R86 and the second excitation source SINE1 to be mixed connected to the resistor R87 to obtain the mixed target mixed excitation source MIX_DRV. The resistive amplifier circuit includes an operational amplifier U18A, which amplifies the AC impedance signal connected from the cathode of the electrolytic cell and outputs the amplified AC impedance signal MIX_WAVE.

[0088] like Figure 8 As shown, the first differential amplifier circuit includes an operational amplifier U16B and an operational amplifier U16A.

[0089] The operational amplifier U16B outputs the first intermediate excitation source TRIAN_DRV according to the connected first initial excitation source (including TRIAN_DRV+ and TRIAN_DRV-).

[0090] The operational amplifier U16A is used for impedance matching, and the operational amplifier 16A outputs the first excitation source to be mixed TRIAN1 according to the connected first intermediate excitation source TRIAN_DRV.

[0091] It should be noted that the specific structure of the second differential amplifier circuit can be completely the same as that of the first differential amplifier circuit, so the specific structure of the second differential amplifier circuit can refer to the first differential amplifier circuit. Specifically, the first operational amplifier in the second differential amplifier circuit outputs the second intermediate excitation source SINE_DRV according to the connected second initial excitation source (including SINE_DRV+ and SINE_DRV-), and the second operational amplifier in the second differential amplifier circuit outputs the second excitation source SINE1 to be mixed according to the connected second intermediate excitation source SINE_DRV.

[0092] In one embodiment, the control unit includes a single chip microcomputer.

[0093] It should be noted that the components in the drawings that are not mentioned in the above embodiments are all components that realize the basic functions of the circuit. Their specific functions can be referred to the relevant existing technologies and will not be described in detail here.

[0094] The above is a detailed introduction to a hydrogen ion detection circuit and a detection system for a hydrogen fuel cell electrolyzer provided by the present invention. Specific examples are used herein 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 of the present invention and its core idea; 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 methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0095] 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 hydrogen ion detection circuit, It is characterized in that The hydrogen ion detection circuit comprises: Hydrogen ion sensitive field effect transistor, constant current source drive circuit, current limiting resistor; The drain of the hydrogen ion sensitive field effect transistor is electrically connected to the output end of the constant current source driving circuit to access the constant current source driving signal output by the constant current source driving circuit, the source of the hydrogen ion sensitive field effect transistor is electrically connected to the first end of the current limiting resistor, and the second end of the current limiting resistor is grounded; The gate of the hydrogen ion sensitive field effect transistor is used to be electrically connected to the first output terminal of the control unit to receive the bias driving voltage signal output by the control unit; The gate of the hydrogen ion sensitive field effect transistor is also used to be electrically connected to the first collection terminal of the control unit, and the source of the hydrogen ion sensitive field effect transistor is also used to be electrically connected to the second collection terminal of the control unit; The hydrogen ion sensitive field effect transistor is used to be arranged in a hydrogen fuel cell electrolyzer to feed back a corresponding gate-source voltage signal to the control unit according to the concentration of hydrogen ions in the hydrogen fuel cell electrolyzer.

2. The hydrogen ion detection circuit according to claim 1, It is characterized in that The constant current source driving circuit comprises a driving amplifier circuit and a first MOS tube; The inverting input terminal of the driving amplifier circuit is used to access a first reference voltage signal, the non-inverting input terminal of the driving amplifier circuit is used to access an amplified driving voltage signal, the output terminal of the driving amplifier circuit is electrically connected to the gate of the first MOS tube, the drain of the first MOS tube is connected to an operating voltage signal, and the source of the first MOS tube is electrically connected to the drain of the hydrogen ion sensitive field effect transistor.

3. The hydrogen ion detection circuit according to claim 2, It is characterized in that The constant current source driving circuit also includes a comparison circuit, a feedback circuit and a second MOS tube; The drain and source of the second MOS tube are respectively connected in series with the drain and source of the hydrogen ion sensitive field effect transistor, the drain and source of the first MOS tube, and the current limiting resistor, the gate of the second MOS tube is electrically connected to the output end of the comparison circuit, the first end of the current limiting resistor is also electrically connected to the non-inverting input end of the feedback circuit, the inverting input end of the feedback circuit is respectively electrically connected to the output end of the feedback circuit and the inverting input end of the comparison circuit, and the non-inverting input end of the comparison circuit is used to access the second reference voltage signal.

4. The hydrogen ion detection circuit according to claim 3, It is characterized in that The inverting input terminal of the driving amplifier circuit is electrically connected to the output terminal of the feedback circuit and the inverting input terminal of the comparison circuit respectively, so as to use the feedback voltage signal output by the feedback circuit as the first reference voltage signal; The amplified driving voltage signal connected to the non-inverting input terminal of the driving amplifier circuit is greater than the second reference voltage signal connected to the non-inverting input terminal of the comparison circuit.

5. The hydrogen ion detection circuit according to claim 2, It is characterized in that The non-inverting input terminal of the driving amplifier circuit is used to be electrically connected to the second output terminal of the control unit to receive the amplified driving voltage signal output by the control unit.

6. A detection system for a hydrogen fuel cell electrolyzer, It is characterized in that The detection system of the hydrogen fuel cell electrolyzer comprises the hydrogen ion detection circuit and control unit according to any one of claims 1 to 5.

7. The detection system for a hydrogen fuel cell electrolyzer according to claim 6, It is characterized in that The hydrogen ion detection circuits are provided with two, and the two hydrogen ion detection circuits are used as an anode hydrogen ion detection circuit and a cathode hydrogen ion detection circuit respectively; The anode hydrogen ion detection circuit is used to be arranged at the anode in the hydrogen fuel cell electrolyzer, so as to feed back the corresponding anode gate-source voltage signal to the control unit according to the concentration of hydrogen ions at the anode in the hydrogen fuel cell electrolyzer; The cathode hydrogen ion detection circuit is used to be arranged at the cathode in the hydrogen fuel cell electrolyzer to feed back the corresponding cathode gate-source voltage signal to the control unit according to the concentration of hydrogen ions at the cathode in the hydrogen fuel cell electrolyzer; The control unit is used to perform hydrogen ion penetration detection on the hydrogen fuel cell electrolyzer according to the anode gate-source voltage signal and the cathode gate-source voltage signal.

8. The detection system for a hydrogen fuel cell electrolyzer according to claim 6, It is characterized in that The detection system of the hydrogen fuel cell electrolyzer also includes an impedance detection circuit; The impedance detection circuit includes an adding circuit, a resistive amplifier circuit, and an impedance amplitude-frequency circuit; The first input end of the adding circuit is used to access a first excitation source to be mixed, and the second input end of the adding circuit is used to access a second excitation source to be mixed; The output end of the adding circuit is used to be electrically connected to the anode of the hydrogen fuel cell electrolyzer to output the target mixed excitation source to the anode of the hydrogen fuel cell electrolyzer; The input end of the resistive amplifier circuit is used to be electrically connected to the cathode of the hydrogen fuel cell electrolyzer to access the AC impedance signal output by the cathode of the hydrogen fuel cell electrolyzer, the output end of the resistive amplifier circuit is electrically connected to the input end of the impedance amplitude-frequency circuit, and the output end of the impedance amplitude-frequency circuit is electrically connected to the third acquisition end of the control unit.

9. The detection system for a hydrogen fuel cell electrolyzer according to claim 8, It is characterized in that The impedance detection circuit also includes a first differential amplifier circuit and a second differential amplifier circuit; The input end of the first differential amplifier circuit is used to access the first initial excitation source, and the output end of the first differential amplifier circuit is electrically connected to the first input end of the adding circuit to output the first excitation source to be mixed to the first input end of the adding circuit; The input end of the second differential amplifier circuit is used to access the second initial excitation source, and the output end of the second differential amplifier circuit is electrically connected to the second input end of the adding circuit to output the second excitation source to be mixed to the second input end of the adding circuit.

10. A detection system for a hydrogen fuel cell electrolyzer according to any one of claims 6 to 9, It is characterized in that The control unit includes a single chip microcomputer.

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