Bias voltage configuration method and system for electrochemical sensor

Abstract

The invention discloses a bias voltage configuration method and system for an electrochemical sensor, the system comprises an electrochemical signal processing module, a bias voltage configuration module and a main control module, and the electrochemical signal processing module is used for providing adaptive working voltage for the sensor and transmitting a current signal output by a working electrode of the sensor to the main control module; the bias voltage configuration module outputs a first voltage and a second voltage, and configures the first voltage to adjust the bias voltage; and the main control module is used for controlling the bias configuration module and the electrochemical signal processing module. The intelligent configuration of the bias voltage is realized through the control of the main control module, the system is suitable for electrochemical sensors with different bias voltages, different measuring ranges and different sensitivities, corresponding parameters are automatically matched according to the types, the measuring ranges and the sensitivities of the sensors, a hardware circuit is shared, and the hardware cost, the management cost and the labor cost of products can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical sensors, and more particularly to a bias configuration method and system for electrochemical sensors. Background Art

[0002] With the progress of industrialization, environmental pollution issues have become increasingly prominent, especially the toxic gases emitted by industries have become more and more threatening to air quality. These toxic gases not only damage the ecological environment, but also pose a direct threat to human health, such as causing respiratory diseases and nervous system damage. People have also realized this and started to detect various gases, so more and more gas detectors have entered the market.

[0003] Gas detector is an instrument tool for detecting gas leakage concentration. It mainly uses gas sensors to detect the types of gases in the environment. Gas sensors are sensors used to detect the composition and content of gases. However, different electrochemical sensors have two types of biased and unbiased operation. Biased operation means that there needs to be a voltage difference between the counter electrode and the working electrode; unbiased operation means that there does not need to be a voltage difference between the counter electrode and the working electrode.

[0004] In practical applications, it is always necessary to design different bias configuration circuits according to different electrochemical sensors and adjust the bias between the sensor counter electrode and the working electrode, which is time-consuming and labor-intensive. For users, if they need to measure different gases, they need to purchase and use different sensor circuits, which increases the cost of use.

[0005] The above shortcomings need to be improved. Summary of the invention

[0006] In order to solve or alleviate the problems in the above-mentioned prior art that different electrochemical sensors have different operating voltages, circuit design is required for different electrochemical sensors, production is time-consuming and labor-intensive, and the user cost is high, the present invention provides a bias configuration method and system for an electrochemical sensor.

[0007] The technical solution of the present invention is as follows:

[0008] A bias configuration method for an electrochemical sensor, comprising the following steps:

[0009] S1. Input basic parameters of sensor bias adjustment to the main control module;

[0010] S2. According to the sensor bias voltage, the basic parameters are adjusted, and the main control module sends control instructions to the bias voltage configuration module and the electrochemical signal processing module respectively;

[0011] S3, the bias configuration module receives a control instruction, configures a first voltage, and outputs the first voltage and the second voltage to the electrochemical signal processing module;

[0012] S4. The electrochemical signal processing module transmits the first voltage to the sensor counter electrode, transmits the second voltage to the sensor working electrode, and amplifies and conditions the current signal output by the sensor working electrode and transmits it to the main control module for analog-to-digital conversion.

[0013] A bias configuration system for an electrochemical sensor, applying the above-mentioned bias configuration method for an electrochemical sensor, comprises an electrochemical signal processing module, a bias configuration module, and a main control module, wherein the electrochemical signal processing module is used to provide an adaptive working voltage to the sensor and transmit the current signal output by the working electrode of the sensor to the main control module; the bias configuration module outputs the first voltage and the second voltage, the first voltage is transmitted to the sensor counter electrode, the second voltage is transmitted to the sensor working electrode, and the first voltage is configured to adjust the bias between the first voltage and the second voltage; the main control module is used to control the bias amount of the bias configuration module.

[0014] The above-mentioned bias configuration system for an electrochemical sensor, the bias configuration module includes a plurality of voltage-dividing resistors connected in series, a short-circuit control switch is arranged between adjacent voltage-dividing resistors, the short-circuit control switch is used to short-circuit the voltage-dividing resistors of the subsequent stage to configure different first voltages, and the main control module controls the on and off of the short-circuit control switch.

[0015] Further, the short-circuit control switch is a triode, the collector of the triode is connected between the voltage-dividing resistors, the base is connected to the main control module, and the emitter is grounded;

[0016] And / or, the short-circuit control switch is a MOS tube, the source of the MOS tube is connected between the voltage-dividing resistors, the gate is connected to the main control module, and the drain is grounded.

[0017] The above-mentioned bias configuration system for an electrochemical sensor, the bias configuration module includes a first operational amplifier circuit and a second operational amplifier circuit, the first operational amplifier circuit and the second operational amplifier circuit are electrically connected to the main control module respectively, the first operational amplifier circuit is used to output the first voltage delivered to the sensor counter electrode, and the second operational amplifier circuit is used to output the second voltage delivered to the sensor working electrode.

[0018] The above-mentioned bias configuration system for an electrochemical sensor, the bias configuration module includes a first digital-to-analog conversion circuit and a second digital-to-analog conversion circuit, the first digital-to-analog conversion circuit and the second digital-to-analog conversion circuit are both electrically connected to the main control module, the first digital-to-analog conversion circuit is used to output the first voltage delivered to the sensor counter electrode, and the second digital-to-analog conversion circuit is used to output the second voltage delivered to the sensor working electrode.

[0019] In the above-mentioned bias configuration system for an electrochemical sensor, the main control module includes a microcontroller, and the pins of the microcontroller are electrically connected to the bias configuration module.

[0020] Furthermore, the microcontroller is a programmable controller.

[0021] Furthermore, the main control module includes an analog-to-digital conversion circuit electrically connected to the microcontroller, the analog-to-digital conversion circuit is electrically connected to the electrochemical signal processing output terminal, and the main control module is used to adjust the amplification factor of the analog-to-digital conversion circuit.

[0022] Furthermore, the electrochemical signal processing module includes a signal amplification circuit, which is used to amplify the current signal output by the working electrode of the sensor and transmit it to the main control module. The main control module is used to control the amplification factor of the signal amplification circuit and adapt the input signal width of the analog-to-digital conversion module of the main control module.

[0023] The above-mentioned bias configuration system for an electrochemical sensor, the signal amplification circuit includes a third operational amplifier circuit and a fourth operational amplifier circuit, the third operational amplifier circuit is electrically connected to the first voltage output end of the bias configuration module and the sensor counter electrode, the fourth operational amplifier circuit is electrically connected to the second voltage output end of the bias configuration module and the sensor working electrode, and the fourth operational amplifier circuit is electrically connected to the main control module.

[0024] Furthermore, the electrochemical signal processing module includes a first filtering circuit, a second filtering circuit and a third filtering circuit, the first filtering circuit is connected between the third operational amplifier circuit and the sensor reference electrode, the second filtering circuit is connected between the third operational amplifier circuit and the first voltage output terminal of the bias configuration module, and the third filtering circuit is connected between the fourth operational amplifier circuit and the second voltage output terminal of the bias configuration module.

[0025] The present invention according to the above scheme has the beneficial effect that the bias configuration system of the present invention can be applied to biased and unbiased electrochemical sensors, and can reduce product design costs. Compared with traditional technology, in order to meet the bias requirements of different sensors, it is necessary to design a variety of different circuits, increase the design complexity, and increase production costs. However, the present application realizes intelligent configuration of bias through the control of the main control module, so that the same sensor circuit can be compatible with multiple sensor types, improving the flexibility and versatility of the product. At the same time, the system realizes intelligent control of sensor production. During the sensor production process, the bias configuration of the sensor can be automatically completed by setting the corresponding bias parameters through software, thereby improving production efficiency. In addition, after maintaining and upgrading the sensor, it can be reconfigured for easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a system architecture diagram of the present invention;

[0028] Figure 2 This is a circuit diagram of a microcontroller of a main control module in Embodiment 2 of the present invention;

[0029] Figure 3 A circuit diagram of an analog-to-digital conversion circuit of a main control module according to Embodiment 2 of the present invention;

[0030] Figure 4 is a circuit diagram of a bias configuration module according to Embodiment 2 of the present invention;

[0031] Figure 5 is a circuit diagram of an electrochemical signal processing module according to Embodiment 2 of the present invention;

[0032] Figure 6 A circuit diagram of a microcontroller of a main control module according to Embodiment 3 of the present invention;

[0033] Figure 7 A circuit diagram of an analog-to-digital conversion circuit of a main control module according to Embodiment 3 of the present invention;

[0034] Figure 8 is a circuit diagram of a bias configuration module according to Embodiment 3 of the present invention;

[0035] Fig. 9 is a circuit diagram of a bias configuration module according to Embodiment 4 of the present invention;

[0036] Fig.10 It is a diagram of the method steps of the present invention.

[0037] Among them, the reference numerals in the figures are: 1. electrochemical signal processing module; 2. bias configuration module; 3. main control module. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] It should be noted that when a component is referred to as being "fixed" or "set" or "connected" to another component, it may be located directly or indirectly on the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and should not be construed as limitations on the present technical solution. The terms "first", "second", etc. are only used for the convenience of description and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0040] Example 1

[0041] A bias configuration method for an electrochemical sensor according to an embodiment of the present invention comprises the following steps:

[0042] S1. Input the basic parameters of sensor bias adjustment to the main control module, including sensor bias, range, and accuracy;

[0043] S2. According to the sensor bias voltage, the basic parameters are adjusted, and the main control module sends control instructions to the bias voltage configuration module and the electrochemical signal processing module respectively;

[0044] S3, the bias configuration module receives the control instruction, configures the first voltage, and outputs the first voltage and the second voltage to the electrochemical signal processing module;

[0045] S4, the electrochemical signal processing module transmits the first voltage to the sensor counter electrode, the second voltage to the sensor working electrode, and amplifies and conditions the current signal output by the sensor working electrode and transmits it to the main control module for analog-to-digital conversion to input the data into the microcontroller.

[0046] Example 2

[0047] like Figure 1As shown, a bias configuration system for an electrochemical sensor described in one embodiment of the present invention applies the above-mentioned bias configuration method for an electrochemical sensor, including an electrochemical signal processing module 1, a bias configuration module 2, and a main control module 3. The electrochemical signal processing module 1 is used to provide an adaptive working voltage to the sensor, and processes the current signal output by the working electrode of the sensor and transmits it to the main control module 3 for analog-to-digital conversion 3; the bias configuration module 2 outputs a first voltage VC and a second voltage VA, the first voltage VC is transmitted to the sensor counter electrode, and the second voltage VA is transmitted to the sensor working electrode, and the first voltage VC is configured to adjust the bias between the first voltage VC and the second voltage VA; the main control module 3 is used to control the bias amount of the bias configuration module 2, as well as control the amplification factor of the electrochemical signal processing module 1, and adapt the input signal width of the main control module 3 for analog-to-digital conversion.

[0048] When working, the main control module 3 automatically controls the bias configuration module 2 to output the corresponding bias amount according to the type of sensor, and automatically configures the signal amplification multiple of the electrochemical signal processing module 1 according to the range and sensitivity of the sensor, so that the output signal quantity meets the needs of the range. The main control module 3 sends a control instruction to the bias configuration module 2. After receiving the instruction, the bias configuration module 2 configures the first voltage VC and outputs the first voltage VC and the second voltage VA. The bias value = the first voltage VC-the second voltage VA. When the first voltage VC is greater than the second voltage VA, the bias is a positive bias; when the first voltage VC is less than the second voltage VA, the bias is a negative bias; when the first voltage VC is equal to the second voltage VA, the bias is zero bias. The first voltage is transmitted to the sensor counter electrode through the electrochemical signal processing module 1, and the second voltage is transmitted to the sensor working electrode. The normal working voltage of the sensor ensures the normal working of the sensor. In addition, the electrochemical signal processing module 1 amplifies the current signal detected by the sensor, and then feeds the amplified signal back to the main control module 3 through analog-to-digital conversion. The main control module 3 compares the feedback value with the preset value to reflect the detection result of the sensor.

[0049] In this embodiment, the bias configuration system can be applied to biased and unbiased electrochemical sensors, and can reduce product design costs. Compared with traditional technologies, in order to meet the bias requirements of different sensors, it is necessary to design a variety of different circuits, increase the complexity of the design, and the production cost is high. However, this application is controlled by the main control module 3, and the intelligent configuration of the bias is realized. It can be applied to electrochemical sensors with different biases, different ranges, and different sensitivities, and automatically match the corresponding parameters according to the sensor type, range, and sensitivity. The hardware circuit is shared, which effectively reduces the product hardware cost, management cost, and labor cost; and the same sensor circuit can be compatible with multiple sensor types, improving the flexibility and versatility of the product. At the same time, this system realizes intelligent control of sensor production. During the sensor production process, the bias configuration of the sensor can be automatically completed by setting the corresponding bias parameters through software, thereby improving production efficiency. In addition, after maintaining and upgrading the sensor, it can be reconfigured for easy maintenance.

[0050] The bias configuration module 2 includes a plurality of voltage-dividing resistors connected in series, and a short-circuit control switch is provided between adjacent voltage-dividing resistors. The short-circuit control switch is used to short-circuit the subsequent voltage-dividing resistors to configure different first voltages. The main control module 3 controls the on and off of the short-circuit control switch.

[0051] The short-circuit control switch is a triode, the collector of the triode is connected between the voltage-dividing resistors, the base is connected to the main control module 3, and the emitter is grounded.

[0052] The main control module 3 includes a microcontroller, and the pins of the microcontroller are electrically connected to the bias configuration module 2 .

[0053] Specifically, Figures 2 to 4As shown, the model of the microcontroller U2 is HC32L110C6PA. The bias configuration module 2 includes a first voltage-dividing resistor R11, a second voltage-dividing resistor R12, a third voltage-dividing resistor R13, a fourth voltage-dividing resistor R14, and a fifth voltage-dividing resistor R15, wherein the resistance values ​​of the first voltage-dividing resistor R11, the second voltage-dividing resistor R12, the third voltage-dividing resistor R13, the fourth voltage-dividing resistor R14, and the fifth voltage-dividing resistor R15 are 20KΩ, 13.7KΩ, 1.96KΩ, 4.32KΩ, and 23.2KΩ, respectively, to achieve 0mV, +200mV, +300mV, and -600mV bias. The short-circuit control switch includes a first transistor Q1, a second transistor Q2, and a third transistor Q3. The collector of the first transistor Q1 is connected between the second voltage-dividing resistor R12 and the third voltage-dividing resistor R13, the emitter is grounded, and the base is controlled by pin 3 VP300 of the main control module; the collector of the second transistor Q2 is connected between the fourth voltage-dividing resistor R14 and the fifth voltage-dividing resistor R15, the emitter is grounded, and the base is controlled by pin 3 VN600 of the main control module; the collector of the third transistor Q3 is connected between the third voltage-dividing resistor R13 and the fourth voltage-dividing resistor R14, the emitter is grounded, and the base is controlled by pin 3 VP200 of the main control module; the resistance value of the voltage-dividing resistor controls the on-off adjustment of the transistor through the burned program, and the resistance value and quantity of the voltage-dividing resistor can be selected according to needs, not limited to the already set bias requirements.

[0054] The output circuit of the second voltage is provided with a voltage follower circuit, and the voltage follower circuit includes an amplifier U4, which is used to enhance the bias driving capability and stability.

[0055] In practical applications, the short-circuit control switch may be a MOS tube, the source of the MOS tube is connected between the voltage-dividing resistors, the gate is connected to the main control module, and the drain is grounded.

[0056] The electrochemical signal processing module 1 includes a third operational amplifier circuit and a fourth operational amplifier circuit, the third operational amplifier circuit is electrically connected to the first voltage output terminal of the bias configuration module 2 and the sensor counter electrode, the fourth operational amplifier circuit is electrically connected to the second voltage output terminal of the bias configuration module 2 and the sensor working electrode, and the fourth operational amplifier circuit is electrically connected to the main control module 3.

[0057] The electrochemical signal processing module 1 includes a first filter circuit, a second filter circuit and a third filter circuit. The first filter circuit is connected between the third operational amplifier circuit and the sensor reference electrode, the second filter circuit is connected between the third operational amplifier circuit and the first voltage output terminal of the bias configuration module 2, and the third filter circuit is connected between the fourth operational amplifier circuit and the second voltage output terminal of the bias configuration module 2.

[0058] Specifically, Figure 5As shown, the first voltage and the second voltage are respectively connected to the positive input terminals of the third operational amplifier U1.1 of the third operational amplifier circuit and the fourth operational amplifier U1.2 of the fourth operational amplifier circuit, the counter electrode of the sensor is connected to the output terminal of the third amplifier U1.1, the reference electrode is connected to the reverse input terminal of the third amplifier U1.1 through resistors R3 and R4 and to the output terminal of the third amplifier U1.1 through resistor R4 and capacitor C4, and the working electrode is connected to the reference electrode and the reverse input terminal and output terminal of the fourth operational amplifier U1.2. The first filter circuit, the second filter circuit and the third filter circuit include capacitors C4, C7 and C8 respectively, and one end of the capacitors C7 and C8 is grounded. The first voltage VC is filtered by capacitor C7, and the second voltage VA is filtered by capacitor C8.

[0059] The main control module 3 includes an analog-to-digital conversion circuit electrically connected to the microcontroller, and the analog-to-digital conversion circuit is electrically connected to the output end of the electrochemical signal processing module.

[0060] Specifically, Figure 3 As shown, the analog-to-digital conversion circuit includes an analog-to-digital conversion chip U3, model ADS1110A0. The output end of the fourth operational amplifier U1.2 is connected to the Vin+ pin of the analog-to-digital conversion chip U3. The output signal of the working electrode of the sensor is amplified by the amplifier resistor R6, output to the analog-to-digital conversion chip U3 for processing, and then connected to the SCL and SDA pins of the microcontroller. The sensor detection result is fed back, and the analog-to-digital conversion chip U2 converts the feedback signal into a digital signal and sends it to the microcontroller U1. In actual application, the resistance value of the amplifier resistor R6 can be selected as needed, or a digital potentiometer can be used, and the digital potentiometer is controlled by the microcontroller U2 to facilitate the adjustment of the amplification factor. At the same time, the analog-to-digital conversion chip is used to switch the amplification factor according to the needs, which can effectively process the electrochemical signal of the sensor.

[0061] Example 3

[0062] like Figures 6 to 8 As shown, the difference from Example 2 is that the bias configuration module 2 includes a first operational amplifier circuit and a second operational amplifier circuit, the first operational amplifier circuit and the second operational amplifier circuit respectively include a first operational amplifier U5.1 and a second operational amplifier U5.2, the first operational amplifier circuit and the second operational amplifier circuit are respectively electrically connected to the main control module 3, that is, the first operational amplifier circuit and the second operational amplifier circuit are respectively connected to the digital-to-analog conversion outputs DAC_VC and DAC_VA of the main control module 3, the first operational amplifier circuit is used to output a first voltage delivered to the sensor counter electrode, and the second operational amplifier circuit is used to output a second voltage delivered to the sensor working electrode.

[0063] A microcontroller is a programmable controller.

[0064] Specifically, the programmable controller is a single-chip microcomputer, model STM32L431RCT6, and the analog-to-digital conversion circuit includes an analog-to-digital conversion chip U2, model ADS1110A0. It should be noted that the programmable controller and the analog-to-digital conversion chip include but are not limited to the two chips listed. The voltage is output to the positive input terminal of the operational amplifier through the DAC pin of the single-chip microcomputer, and the output terminal is connected to the ADC pin of the single-chip microcomputer to verify the accuracy of the voltage. The first voltage and the second voltage can be adjusted to improve the voltage accuracy. The DAC pin can convert a digital signal into an analog voltage signal, that is, the single-chip microcomputer U1 is integrated with a digital-to-analog conversion function, and can output any value of 0 to 3.3V according to different bias requirements. The operational amplifiers U5.1 and U5.2 are used as emitter followers here to increase the driving ability and stability of the signal. Therefore, DAC can output any voltage signal of 0 to 3.3V according to the control of the single-chip microcomputer, and operational amplifiers U5.1 and U5.2 will output the same voltage signal. The size of the signal depends on the bias value required by the sensor. For example, DAC VC outputs 0.9V and DAC VA outputs 0.6V, then the bias value is DAC VC-DAC VA=0.3V, that is, +300mV. When different electrochemical sensors require different bias voltages, the bias voltage can be automatically adjusted by simply inputting the sensor type, range, sensitivity and other parameters through the serial port without modifying the software and hardware.

[0065] Example 4

[0066] like Figure 6 , Figure 7 and Fig. 9 As shown, the difference from Example 3 is that the bias configuration module 2 includes a first digital-to-analog conversion circuit and a second digital-to-analog conversion circuit, and the first digital-to-analog conversion circuit and the second digital-to-analog conversion circuit are both electrically connected to the main control module 3, that is, the first digital-to-analog conversion circuit and the second digital-to-analog conversion circuit are both connected to the I2C bus (SCL1, SDA1) of the main control module, and the first digital-to-analog conversion circuit is used to output a first voltage delivered to the sensor counter electrode, and the second digital-to-analog conversion circuit is used to output a second voltage delivered to the sensor working electrode.

[0067] Specifically, the first digital-to-analog conversion circuit includes an analog-to-digital conversion chip U3, and the second digital-to-analog conversion circuit includes an analog-to-digital conversion chip U4, that is, the digital-to-analog conversion function is externalized to the single-chip microcomputer U1, and the analog-to-digital conversion chip U3 outputs a first voltage and the analog-to-digital conversion chip U4 outputs a second voltage through the single-chip microcomputer U1 pins SCL1 and SDA1, and the single-chip microcomputer pins VC and VA are used for voltage detection, which can achieve precise control of the voltage and improve the voltage accuracy. Similarly, when different electrochemical sensors require different bias voltages, the bias voltage can be automatically adjusted by simply inputting the sensor type, range, sensitivity and other parameters through the serial port without modifying the software and hardware.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bias configuration method for an electrochemical sensor, characterized in that: The following steps are involved: S1. Input basic parameters of sensor bias adjustment to the main control module; S2. According to the sensor bias voltage, the basic parameters are adjusted, and the main control module sends control instructions to the bias voltage configuration module and the electrochemical signal processing module respectively; S3, the bias configuration module receives a control instruction, configures a first voltage, and outputs the first voltage and the second voltage to the electrochemical signal processing module; S4. The electrochemical signal processing module transmits the first voltage to the sensor counter electrode, transmits the second voltage to the sensor working electrode, and amplifies and conditions the current signal output by the sensor working electrode and transmits it to the main control module for analog-to-digital conversion.

2. A bias configuration system for an electrochemical sensor, characterized in that: The bias configuration method for an electrochemical sensor according to claim 1 comprises: An electrochemical signal processing module, which is used to provide an adaptive working voltage to the sensor and transmit the current signal output by the working electrode of the sensor to the main control module; A bias configuration module, wherein the bias configuration module outputs the first voltage and the second voltage, wherein the first voltage is delivered to the sensor counter electrode, and the second voltage is delivered to the sensor working electrode, and the first voltage is configured to adjust a bias between the first voltage and the second voltage; A main control module, the main control module is used to control the bias amount of the bias configuration module.

3. A bias configuration system for an electrochemical sensor according to claim 2, characterized in that: The bias configuration module includes a plurality of voltage-dividing resistors connected in series, and a short-circuit control switch is arranged between adjacent voltage-dividing resistors. The short-circuit control switch is used to short-circuit the voltage-dividing resistors at the subsequent stage to configure different first voltages. The main control module controls the on and off of the short-circuit control switch.

4. A bias configuration system for an electrochemical sensor according to claim 3, characterized in that: The short-circuit control switch is a triode, the collector of the triode is connected between the voltage-dividing resistors, the base is connected to the main control module, and the emitter is grounded; Alternatively, the short-circuit control switch is a MOS tube, a source of the MOS tube is connected between the voltage-dividing resistors, a gate is connected to the main control module, and a drain is grounded.

5. A bias configuration system for an electrochemical sensor according to claim 2, characterized in that: The bias configuration module includes a first operational amplifier circuit and a second operational amplifier circuit, the first operational amplifier circuit and the second operational amplifier circuit are electrically connected to the main control module respectively, the first operational amplifier circuit is used to output the first voltage to the sensor counter electrode, and the second operational amplifier circuit is used to output the second voltage to the sensor working electrode.

6. A bias configuration system for an electrochemical sensor according to claim 2, characterized in that: The bias configuration module includes a first digital-to-analog conversion circuit and a second digital-to-analog conversion circuit, both of which are electrically connected to the main control module, the first digital-to-analog conversion circuit is used to output the first voltage to the sensor counter electrode, and the second digital-to-analog conversion circuit is used to output the second voltage to the sensor working electrode.

7. A bias configuration system for an electrochemical sensor according to any one of claims 2 to 6, characterized in that: The main control module includes a microcontroller, a pin of the microcontroller is electrically connected to the bias configuration module, the main control module includes an analog-to-digital conversion circuit electrically connected to the microcontroller, the analog-to-digital conversion circuit is electrically connected to the output end of the electrochemical signal processing module, and the main control module is used to adjust the amplification factor of the analog-to-digital conversion circuit.

8. A bias configuration system for an electrochemical sensor according to any one of claims 2 to 6, characterized in that: The electrochemical signal processing module includes a signal amplification circuit, which is used to amplify the current signal output by the working electrode of the sensor and transmit it to the main control module. The main control module is used to control the amplification factor of the signal amplification circuit and adapt the input signal width of the main control module for analog-to-digital conversion.

9. A bias configuration system for an electrochemical sensor according to any one of claim 8, characterized in that: The signal amplification circuit includes a third operational amplifier circuit and a fourth operational amplifier circuit, the third operational amplifier circuit is electrically connected to the first voltage output end of the bias configuration module and the sensor counter electrode, the fourth operational amplifier circuit is electrically connected to the second voltage output end of the bias configuration module and the sensor working electrode, and the fourth operational amplifier circuit is electrically connected to the main control module.

10. A bias configuration system for an electrochemical sensor according to claim 9, characterized in that: The electrochemical signal processing module includes a first filter circuit, a second filter circuit and a third filter circuit. The first filter circuit is connected between the third operational amplifier circuit and the sensor reference electrode, the second filter circuit is connected between the third operational amplifier circuit and the first voltage output terminal of the bias configuration module, and the third filter circuit is connected between the fourth operational amplifier circuit and the second voltage output terminal of the bias configuration module.

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