Full-isolation high-synchronization electrochemical signal acquisition circuit and electrochemical workstation

Abstract

The utility model provides a kind of full isolation high synchronous electrochemical signal acquisition circuit and electrochemical workstation, electrochemical workstation uses full isolation high synchronous electrochemical signal acquisition circuit, the circuit includes: power supply circuit, magnetic coupler, control module, flyback switching power supply feedback side, multiple flyback switching power supply secondary side, digital-analog conversion module, electrochemistry front stage, transconductance system and electrolytic cell;The digital-analog conversion module includes DAC and ADC;The isolation of digital signal is realized by flyback switching power supply and magnetic coupler, realizes the complete decoupling of three-electrode electrolytic cell system in electricity, and each electrolytic cell measurement electrode group is floating with the reference potential of electrolytic cell system itself, and does not affect the potential difference measurement in electrode and Faraday current measurement. Realize that the influence of measuring tool to measuring body is reduced to minimum.

Description

Technical Field

[0001] This utility model relates to the field of signal detection technology in the electrochemical industry, and in particular to a fully isolated high-synchronization electrochemical signal acquisition circuit and an electrochemical workstation. Background Technology

[0002] When conducting multi-electrolytic cell systems, we generally use multichannel electrochemical workstations for measurements. Existing electrochemical workstations inevitably have some degree of electrical coupling in their measuring components, particularly between individual modules. This means that within each module, there exists a reference potential related to the electrochemical detector. However, sometimes the potential of the electrolytic cells themselves fluctuates, and multiple cells need to be measured simultaneously and independently. For example, certain biological electrochemical tests, especially those involving interconnected yet independent electrical systems requiring strict simultaneous time measurements, present challenges when using general multichannel electrochemical workstations. For instance, in biological tests, the organism itself has its own potential, and different parts of the organism exhibit potential differences. These biological reference electrical signals may be crucial parameters for the organism's function. Coupling at the electrochemical workstation can affect the organism's potential, pulling it closer to the workstation's reference potential. This could potentially influence the organism's operation, leading to biased experimental results. Secondly, microprocessor-based electrochemical workstations may be affected by the sequential execution of programs. That is, the measurement request of system 1 is sent first, followed by the measurement request of system 2. In interconnected electrochemical electrolysis cells, such as different parts of a living organism, we sometimes need to strictly and simultaneously measure the microcurrent changes at different locations. Therefore, multi-channel acquisition using microprocessor-based electrochemical workstations has its limitations. Utility Model Content

[0003] To address the aforementioned problems, this invention innovatively proposes a fully isolated high-synchronization electrochemical signal acquisition circuit and electrochemical workstation. Through the isolation of digital signals using a flyback switching power supply and magnetic couplers, complete electrical decoupling of the three-electrode electrolytic cell system is achieved. Each electrolytic cell's measuring electrode group floats with the reference potential of the electrolytic cell system itself, without affecting the measurement of potential difference and Faraday current in the electrodes. This minimizes the influence of the measuring instrument on the measured object.

[0004] Specifically, this utility model also provides a fully isolated high-synchronization electrochemical signal acquisition circuit, the circuit including: a power supply circuit, a magnetic coupler, a control module, a flyback switching power supply feedback side, multiple flyback switching power supply secondary sides, a digital-to-analog conversion module, an electrochemical front-end, a transconductance system, and an electrolytic cell; the digital-to-analog conversion module includes a DAC and an ADC; the power supply circuit includes a power chip and a flyback switching power supply primary side;

[0005] The primary side of the flyback switching power supply is connected to an external power source and is regulated by the voltage regulator circuit; the regulated voltage is sent to the secondary side of the plurality of flyback switching power supplies via a magnetic coupler; the magnetic coupler is connected to the control module.

[0006] The secondary side of the flyback switching power supply is connected to a digital-to-analog converter module, which is connected to the electrolytic cell through an electrochemical front-end and a transconductance system.

[0007] The power chip and the primary side of the flyback switching power supply also include:

[0008] The REF and VCC pins of the power chip are connected to capacitors C27 and C30 respectively and then connected to the DGND terminal; the COMP pin is connected to resistor R51, which is in parallel with capacitor C25; the FB pin is connected to resistor R53 and then to the power supply; resistor R54 is connected in parallel with resistor R53 and grounded; the CS pin is connected to capacitor C31 and then grounded; the RC pin is connected to capacitor C31 and then grounded; the OUT pin is connected to the input terminal of the magnetic coupler through a protection circuit as the primary side of the flyback switching power supply; the input terminal of the magnetic coupler is also connected in parallel with capacitors C21, C22, C23 and C24; the input terminal of the magnetic coupler is connected to the low-side gate LG and the input terminal IG.

[0009] The protection circuit includes a resistor R48 and a diode D20 connected in parallel with the resistor R48.

[0010] The control module includes a microprocessor and an FPGA; the microprocessor and the FPGA are powered by a flyback switching power supply feedback side; the microprocessor is used to send a digital request signal to the FPGA, and the FPGA simultaneously sends the corresponding request to the corresponding magnetic coupler.

[0011] As another preferred embodiment, the present invention also provides an electrochemical workstation, wherein the electrochemical workstation employs the fully isolated high-synchronization electrochemical signal acquisition circuit described above. Attached Figure Description

[0012] Figure 1 This is the basic configuration diagram of the fully isolated high-synchronization electrochemical signal acquisition circuit described in this utility model.

[0013] Figure 2 This is a circuit diagram of another fully isolated high-synchronization electrochemical signal acquisition circuit described in this utility model. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] Example 1, as Figures 1-2 As shown, this utility model provides a fully isolated high-synchronization electrochemical signal acquisition circuit. The circuit includes: a power supply circuit, a magnetic coupler, a control module, a flyback switching power supply feedback side, multiple flyback switching power supply secondary sides, a digital-to-analog converter module, an electrochemical front-end, a transconductance system, and an electrolytic cell; the digital-to-analog converter module includes a DAC and an ADC; the power supply circuit includes a power chip and a flyback switching power supply primary side.

[0016] The magnetic coupler is responsible for transmitting the regulated voltage from the primary side of the flyback switching power supply to the secondary side via electromagnetic induction. The magnetic coupler ensures electrical isolation of the power system, avoids ground loop interference, and also provides necessary power isolation to improve the system's anti-interference capability and safety.

[0017] The electrochemical preamplifier is responsible for amplifying the signal from the electrolytic cell and transmitting it to the transconductance system. Its main function is to amplify and filter weak electrochemical signals to ensure signal quality.

[0018] The electrolytic cell is the core component of the entire electrochemical signal acquisition system, used to carry out electrochemical reactions. The state and behavior of the electrolytic cell directly affect signal acquisition and analysis, while the transconductance system helps control the operating state of the electrolytic cell.

[0019] The primary side of the flyback switching power supply is connected to an external power source and is regulated by the voltage regulator circuit; the regulated voltage is sent to the secondary side of the plurality of flyback switching power supplies via a magnetic coupler; the magnetic coupler is connected to the control module.

[0020] The secondary side of the flyback switching power supply is connected to a digital-to-analog converter module, which is connected to the electrolytic cell through an electrochemical front-end and a transconductance system.

[0021] This application achieves full isolation through a flyback switching power supply and a magnetic coupler, avoiding ground loop problems and signal noise interference. This design effectively improves the system's anti-interference capability, especially in high-precision electrochemical signal acquisition applications, providing higher stability and signal quality.

[0022] The power chip and the primary side of the flyback switching power supply also include:

[0023] The REF and VCC pins of the power chip are connected to capacitors C27 and C30 respectively and then connected to the DGND terminal; the COMP pin is connected to resistor R51, which is in parallel with capacitor C25; the FB pin is connected to resistor R53 and then to the power supply; resistor R54 is connected in parallel with resistor R53 and grounded; the CS pin is connected to capacitor C31 and then grounded; the RC pin is connected to capacitor C31 and then grounded; the OUT pin is connected to the input terminal of the magnetic coupler through a protection circuit as the primary side of the flyback switching power supply; the input terminal of the magnetic coupler is also connected in parallel with capacitors C21, C22, C23 and C24; the input terminal of the magnetic coupler is connected to the low-side gate LG and the input terminal IG.

[0024] The protection circuit includes a resistor R48 and a diode D20 connected in parallel with the resistor R48.

[0025] The control module includes a microprocessor and an FPGA; the microprocessor and the FPGA are powered by a flyback switching power supply feedback side; the microprocessor is used to send a digital request signal to the FPGA, and the FPGA simultaneously sends the corresponding request to the corresponding magnetic coupler.

[0026] In Example 3, this utility model also provides an electrochemical workstation, wherein the electrochemical workstation adopts the fully isolated high-synchronization electrochemical signal acquisition circuit as described in Example 2 above.

[0027] The electrochemical workstation described in this application employs a fully isolated, high-synchronization electrochemical signal acquisition circuit, ensuring high accuracy and synchronization during signal acquisition. This characteristic is crucial for the precise measurement of minute currents and voltages in electrochemical experiments. Because the electrochemical signal acquisition circuit utilizes a fully isolated flyback switching power supply design, the workstation effectively avoids ground loop noise interference, thereby improving signal quality and enhancing the system's anti-interference capability. This workstation supports the synchronous acquisition and processing of multiple electrochemical signal channels, enabling simultaneous monitoring of multiple electrolytic cells or electrochemical reaction processes. This multi-channel synchronous acquisition capability is ideally suited for various electrochemical analysis and experimental needs, such as simultaneously detecting electrochemical signals from multiple sensors or multiple experimental points.

[0028] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fully isolated high-synchronization electrochemical signal acquisition circuit, characterized in that, The circuit includes: a power supply circuit, a magnetic coupler, a control module, a flyback switching power supply feedback side, multiple flyback switching power supply secondary sides, a digital-to-analog converter module, an electrochemical front-end, a transconductance system, and an electrolytic cell; the digital-to-analog converter module includes a DAC and an ADC; the power supply circuit includes a power chip and a flyback switching power supply primary side. The primary side of the flyback switching power supply is connected to an external power source and is regulated by the voltage regulator circuit; the regulated voltage is sent to the secondary side of the plurality of flyback switching power supplies via a magnetic coupler; the magnetic coupler is connected to the control module. The secondary side of the flyback switching power supply is connected to a digital-to-analog converter module, which is connected to the electrolytic cell through an electrochemical front-end and a transconductance system.

2. The circuit according to claim 1, characterized in that, The power chip and the primary side of the flyback switching power supply also include: The REF and VCC pins of the power chip are connected to capacitors C27 and C30 respectively and then connected to the DGND terminal; the COMP pin is connected to resistor R51, which is connected in parallel with capacitor C25; the FB pin is connected to resistor R53 and then connected to the power supply; resistor R54 is connected in parallel with resistor R53 and grounded; the CS pin is connected to capacitor C31 and then grounded; the RC pin is connected to capacitor C31 and then grounded; the OUT pin is connected to the input terminal of the magnetic coupler through a protection circuit as the primary side of the flyback switching power supply; the input terminal of the magnetic coupler is also connected in parallel with capacitors C21, C22, C23 and C24; the input terminal of the magnetic coupler is connected to the low-side gate LG and the input terminal IG.

3. The circuit according to claim 2, characterized in that, The protection circuit includes a resistor R48 and a diode D20 connected in parallel with the resistor R48.

4. The circuit according to claim 3, characterized in that, The control module includes a microprocessor and an FPGA; the microprocessor and the FPGA are powered by a flyback switching power supply feedback side; the microprocessor is used to send a digital request signal to the FPGA, and the FPGA simultaneously sends the corresponding request to the corresponding magnetic coupler.

5. An electrochemical workstation, characterized in that: The fully isolated high-synchronization electrochemical signal acquisition circuit as described in any one of claims 1-4 is adopted.

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