Membrane electrode power supply system and method based on electrical isolation

Abstract

The invention discloses a membrane electrode power supply system and method based on electrical isolation, and relates to the technical field of electrochemical sensors, the membrane electrode power supply system comprises an electrode host, the electrode host comprises a membrane electrode sensitive assembly, a processing circuit board, a two-wire system loop power supply and output terminal and an NFC wireless interaction module; the membrane electrode sensitive assembly, the two-wire loop power supply and output terminal and the NFC wireless interaction module are electrically connected with the processing circuit board so as to realize signal interaction and processing; the electrode host supports double power supply paths, two-wire loop power supply is used as a first power supply path, NFC wireless power supply is used as a second power supply path, and the two power supply paths are mutually independent.

Description

Technical Field

[0001] This invention relates to the field of electrochemical sensor technology, specifically to a membrane electrode power supply system and method based on electrical isolation. Background Technology

[0002] In the field of electrochemical membrane electrode sensing and industrial process control, traditional electrochemical membrane electrodes are widely used in water quality monitoring, industrial water treatment, chemical reaction process control and other scenarios. However, with the increasing demand for the reliability, adaptability and intelligent management of sensing systems in industrial sites, traditional technologies have many inherent defects and are difficult to meet the actual application requirements.

[0003] Traditional membrane electrodes mostly rely on a single two-wire loop power supply. Once the loop fails or the power supply is interrupted, the sensor stops immediately, with no secondary power supply guarantee. Some wireless power supply solutions do not achieve electrical isolation from the industrial loop, making them susceptible to common-mode interference that causes signal distortion. They are also difficult to be compatible with traditional controllers, requiring additional system modifications, which compromises compatibility and fails to guarantee continuous power supply. The operating potential is fixed at the factory and cannot be dynamically adjusted according to different membrane materials and the object being measured. Furthermore, they only support a single electrode structure. They cannot monitor the voltage of the counter electrode and the reference electrode, nor do they have a means of detecting loop resistance. Traditional analog membrane electrodes only output analog signals, and sensor calibration and configuration require on-site operation. Some digital membrane electrodes lack NFC functionality, making wireless power supply interaction impossible in harsh or deep-water environments. The electrodes are also difficult to seal, and they lack a graded low-power design, making it difficult to meet the needs of long-term silent monitoring and hindering digital management. Summary of the Invention

[0004] The purpose of this invention is to provide a membrane electrode power supply system and method based on electrical isolation to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a membrane electrode power supply system based on electrical isolation, comprising: The electrode host includes a membrane electrode sensing component, a processing circuit board, a two-wire loop power supply and output terminal, and an NFC wireless interaction module. The NFC wireless interaction module is built into the electrode host. The membrane electrode sensitive component, the two-wire loop power supply and output terminal and the NFC wireless interaction module are electrically connected to the processing circuit board to realize the interactive processing between signals. The electrode host supports dual power supply paths, with a two-wire loop power supply as the first power supply path and NFC wireless power supply as the second power supply path; and the two power supply paths are independent of each other.

[0006] In conjunction with the first aspect, in a first implementation of the first aspect of this application, the processing circuit board includes: The processing circuit board includes an analog front end, a low-power microcontroller, a loop power supply circuit, an NFC communication circuit, and power supply switching and voltage regulation components. The loop power supply circuit is used to adapt to two-wire loop power supply, the NFC communication circuit is used to adapt to NFC wireless power supply, and the power supply switching and voltage regulation components are used to realize the switching of dual power supply paths.

[0007] In conjunction with the first aspect, in the second implementation of the first aspect of this application, the loop power supply circuit includes: The loop power supply circuit includes a rectifier element and a power management element; the rectifier element is connected to the two-wire loop power supply and output terminal to realize the positive and negative connection self-adaptation of the two-wire loop power supply; the power management element converts the connected loop power supply into a first supply voltage and outputs it to the power supply switching and voltage regulation element.

[0008] In conjunction with the first aspect, in the third implementation of the first aspect of this application, the NFC communication circuit includes: The NFC communication circuit includes an energy harvesting element, which is connected to the NFC wireless interaction module. It harvests NFC wireless energy through near-field coupling, converts it into a second power supply voltage, and outputs it to the power supply switching and voltage regulation element.

[0009] In conjunction with the first aspect, in the fourth implementation of the first aspect of this application, the power supply switching and voltage regulation element includes: The power supply switching and voltage regulation components include a diode selection network and a dual-channel voltage regulator chip. The diode selection network includes a first diode and a second diode. The anode of the first diode is connected to the first power supply voltage terminal corresponding to the two-wire loop power supply, and the anode of the second diode is connected to the second power supply voltage terminal corresponding to the NFC wireless power supply. The cathodes of both diodes are connected to the dual-channel voltage regulator chip. The output voltage of the dual-channel voltage regulator chip powers the analog front end of the processing circuit board and the low-power microcontroller, realizing the switching of dual power supply paths.

[0010] In conjunction with the first aspect, in the fifth implementation of the first aspect of this application, the NFC wireless interaction module includes: The NFC wireless interaction module includes an NFC antenna, which receives external NFC wireless power and transmits it to the energy harvesting element of the NFC communication circuit; it supports bidirectional data exchange with smartphone NFC.

[0011] In conjunction with the first aspect, in the sixth implementation of the first aspect of this application, the two-wire loop power supply and output terminal includes: The two-wire loop power supply and output terminals include a power supply input terminal, which is connected to the rectifier element of the loop power supply circuit for accessing the two-wire loop power supply. It works with the rectifier element to achieve adaptive access for the positive and negative connections of the first power supply path.

[0012] In conjunction with the first aspect, in the seventh implementation of the first aspect of this application, the electrode host further includes: An NFC adapter is provided, which can establish a communication connection with an NFC wireless interaction module to achieve power supply and bidirectional data exchange.

[0013] In conjunction with the first aspect, in the eighth implementation of the first aspect of this application, the NFC adapter includes: The NFC adapter includes an NFC transmitting antenna assembly, an adapter processing circuit board, and a packaging structure. The NFC adapter is connected to the electrode host through the packaging structure. The adapter processing circuit board includes a power supply circuit, an industrial communication circuit, and a general communication circuit. The power supply circuit is connected to an external power source and converted to a suitable power supply voltage; the NFC transmitting antenna assembly, driven by the power supply circuit, transmits wireless energy to the NFC wireless interaction module of the electrode host, providing an energy source for the second power supply path; the industrial communication circuit is adapted to the industrial controller and supports serial communication protocols; the general communication circuit is adapted to the computer terminal and supports virtual serial port protocols.

[0014] In a second aspect, the present invention provides a membrane electrode power supply method based on electrical isolation, comprising: After the system starts up, it is connected to the two-wire loop power supply and the output terminal to form the first power supply path and output the first power supply voltage. When the NFC adapter is configured, the NFC adapter is connected to the external power supply, which is converted into the adaptation voltage by the power supply circuit. Then, the wireless energy is transmitted to the NFC wireless interaction module through the NFC transmitting antenna component, and then converted into the second power supply voltage by the energy harvesting element to form the second power supply path. Based on the power supply switching and the selection network composed of the first and second diodes in the voltage regulator components of the processing circuit board, automatic switching of the power supply path is realized. When the two-wire loop power supply and the NFC adapter power supply are connected in parallel, the first and second diodes select the power supply path with the higher voltage to conduct. When only the two-wire loop power supply is connected, the first diode conducts and the second diode is cut off, and the first supply voltage is used for power supply. When the two-wire loop power supply is disconnected and the NFC adapter is configured, the second diode conducts and the first diode is cut off, and the system switches to the second supply voltage. The power supply voltage, which is turned on by the gating network, is regulated by a dual-channel voltage regulator chip, and the output stable voltage supplies power to the analog front end of the processing circuit board and the low-power microcontroller respectively. During system operation, the power supply status is monitored in real time. When the current power supply path is interrupted, the system switches to another power supply path through the diode gating network.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a dual power supply path design with a two-wire loop first power supply and an NFC wireless second power supply. By switching through a diode selection network and combining isolation design, complete electrical isolation between the NFC path and the industrial loop is achieved, ensuring continuous power supply.

[0016] 2. This invention supports dynamic configuration of electrochemical working potential, is compatible with two-electrode and three-electrode structures, and collects the counter electrode voltage and reference electrode voltage to realize electrode working status diagnosis.

[0017] 3. This invention integrates NFC wireless interaction, industrial communication and universal interface, and is compatible with multi-terminal interaction scenarios such as mobile phones, industrial controllers and computers, to realize parameter configuration, data reading and status management. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the electrode host of a membrane electrode power supply system based on electrical isolation according to the present invention; Figure 2 This is a processing circuit diagram of a membrane electrode power supply system based on electrical isolation according to the present invention; Figure 3 This is a diagram of the power supply switching and voltage regulation components of a membrane electrode power supply system based on electrical isolation according to the present invention; Figure 4 This is a diagram of a two-wire loop power supply and output terminals for a membrane electrode power supply system based on electrical isolation according to the present invention. Figure 5 This is a diagram of an NFC wireless interaction module based on an electrically isolated membrane electrode power supply system according to the present invention. Figure 6 This is a diagram of an NFC transmitting antenna assembly for an electrically isolated membrane electrode power supply system according to the present invention; Figure 7 This is an RS485 industrial communication circuit diagram of a membrane electrode power supply system based on electrical isolation according to the present invention. Figure 8 This is a DC-DC conversion diagram of a membrane electrode power supply system based on electrical isolation according to the present invention; Figure 9 This is a voltage regulation diagram of an LDO in an electrically isolated membrane electrode power supply system according to the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Figures 1-9 As shown, the present invention provides a technical solution. like Figure 1 The diagram shows the electrode host structure of an electrically isolated membrane electrode power supply system. This invention provides an electrically isolated membrane electrode power supply system, comprising: The electrode host includes a membrane electroelectrode sensing component, a processing circuit board, a two-wire loop power supply and output terminal, an NFC wireless interaction module, and a housing. The membrane electroelectrode sensing component further includes a working electrode, a reference electrode, a counter electrode, and membrane material. The processing circuit board includes an analog front-end, a low-power microcontroller, a loop power supply circuit, an NFC communication circuit, power supply switching and voltage regulation components, and host auxiliary components. The two-wire loop power supply and output terminal consists of a power input terminal and a current output terminal. The NFC wireless interaction module includes an NFC antenna and an NFC interaction matching component. All components are connected in hardware to form a functional closed loop, jointly supporting the realization of dual power supply paths and multi-terminal interaction functions. To further refine the functional breakdown and power supply path adaptation logic of the processing circuit board, the following section combines... Figure 2 Please provide a detailed explanation.

[0021] like Figure 2 The circuit diagram of an electrically isolated membrane electrode power supply system is shown. This invention provides an electrically isolated membrane electrode power supply system, comprising: The analog front-end uses the ADA4505-1ARJZ-R7 chip, integrating a reference electrode buffer, a counter electrode drive, and a transimpedance amplification (TIA) circuit. The counter electrode interface H1 connects to an external counter electrode, the reference electrode interface H3 connects to an external reference electrode, and the working electrode interface H2 connects to an external working electrode. When a two-electrode structure is used, the H1 and H3 interfaces are short-circuited by a 0Ω resistor R3, forming an electrochemical reaction loop adapted to the two-electrode structure. The working electrode current is converted into a working electrode voltage signal by the transimpedance amplification (TIA) circuit, simultaneously with the analog front-end... The counter electrode voltage V_CE is acquired through the counter electrode voltage pin, and the reference electrode voltage V_RE is acquired through the reference electrode voltage pin. The working electrode voltage signal, counter electrode voltage signal, and reference electrode voltage signal are connected to the ADC interface of the low-power microcontroller MCU. The low-power microcontroller MCU performs sampling, filtering, calibration conversion, and 4–20mA mapping algorithm on the received signals, and manages multiple power supply and communication modes. Among them, the counter electrode voltage serves as the diagnostic basis for the electrode's working status. When the electrode cannot establish a constant potential in air, the counter electrode voltage is equal to the power supply voltage or 0V. The analog front-end adopts a dual-path power supply design. The loop power supply path is connected through the power input terminal P1, and the positive and negative connection self-adaptation is achieved through the rectifier element D1. The VREG voltage output by the power management element U6 is the first power supply voltage. When the NFC adapter is configured, the NFC antenna of the NFC power supply path is connected through the corresponding interface H6. Wireless energy harvesting is achieved through near-field coupling of the energy harvesting element U11, and the V_EH voltage is output as the second power supply voltage. The energy harvesting element U11 communicates with the low-power microcontroller MCU through the communication pins NFC_GPO, I2C_SCL and I2C_SDA to realize parameter transmission and update interrupt.

[0022] The switching of dual power supply paths is handled by Figure 3 The power supply switching and voltage regulation components are executed by a selection network consisting of a first diode D4 and a second diode D5, and dual-channel voltage regulator chips REF3020AIDBZR and REF35102QDBVR. The anode of D4 is connected to the first power supply VREG voltage terminal, and the anode of D5 is connected to the second power supply V_EH voltage terminal; both cathodes are connected to the dual-channel voltage regulator chips. The dual-channel voltage regulator chips REF3020AIDBZR and REF35102QDBVR supply power to the analog front-end and the low-power microcontroller MCU, respectively. When the loop power supply and the NFC adapter power supply are connected in parallel, the higher voltage power supply path is automatically selected and turned on via D4 and D5. When only the loop power supply is connected, D4 is turned on and D5 is turned off, prioritizing the first power supply voltage. When the loop is disconnected and the NFC adapter is configured, D5 is turned on and D4 is turned off, switching to the second power supply to ensure continuous power supply. The input voltage of this component comes from the first and second power supply paths. The external connection of the first power supply path needs to be implemented through a dedicated terminal, specifically... Figure 4 Detailed explanation.

[0023] like Figure 4 The diagram shows a two-wire loop power supply and output terminal diagram of an electrically isolated membrane electrode power supply system. This invention provides an electrically isolated membrane electrode power supply system, comprising: The power input terminal adopts model WJ15EDGRC-3.81-2P, and the series rectifier element D1 realizes positive and negative connection self-adaptation; the current output terminal is connected to the power management element U6 of the loop power supply circuit. The low power microcontroller MCU outputs a voltage signal through the analog output port LOOP_DAC to control the power management element to linearly map the concentration signal into a 4–20mA analog current output.

[0024] Corresponding to the first power supply path, the energy reception and multi-terminal interaction functions of the second power supply path are provided by... Figure 5 The NFC wireless interaction module is implemented as follows: The NFC interaction matching element includes a matching capacitor and an interaction-side current-limiting resistor; the NFC antenna is connected to the energy harvesting element U11 of the NFC communication circuit through the corresponding interface H6, and is mounted on a flexible FPC material fitted to the shell; the matching capacitor C15 is a 100nF multilayer ceramic capacitor, used for filtering and forming a 13.56MHz resonant circuit with the antenna; the interaction-side current-limiting resistor R5 is a 20kΩ thin film resistor, which limits the current flowing into the energy harvesting element; when an NFC-enabled smartphone is brought close to the NFC antenna, after the energy harvesting element U11 forwards the command, a bidirectional data exchange link can be established with the low-power microcontroller MCU.

[0025] When configuring an NFC adapter, this module needs to work with the adapter's transmitting component to achieve wireless power and data transmission, specifically by... Figure 6 The NFC transmitting antenna assembly is complete: The NFC transmitting antenna adopts a rectangular spiral structure etched on a PCB and operates at a frequency of 13.56MHz. The transmitting antenna matching components include 270nH inductors L1 and L2, 680pF capacitors C16 and C17, 180pF capacitors C18 and C34, 120pF capacitor C29, and a 3.9Ω transmitting-side current-limiting resistor R4.1, forming an impedance matching network to adapt the NFC transmitting and receiving front end. The component transmits wireless energy to the legitimate electrode host and simultaneously receives and forwards measurement data.

[0026] like Figure 7 The RS485 industrial communication circuit diagram of an electrically isolated membrane electrode power supply system is shown. This invention provides an electrically isolated membrane electrode power supply system, comprising: The RS485 industrial communication circuit uses the isolated industrial communication chip CA-IS2092A as its core. The differential signal interfaces A and B of the chip are connected to the RS485 industrial communication terminals through 10kΩ matching resistors R20 and R21. The data transceiver interfaces RO and DI are connected to the serial communication interface UART of the NFC adapter MCU. The transceiver control interfaces RE and DE are shorted and the transceiver mode is controlled by the IO interface of the NFC adapter MCU. The circuit is equipped with SMF12CA transient suppression diodes D7, D8 and D9 to protect against ESD, supports the Modbus RTU protocol, and is compatible with industrial controller communication.

[0027] The power for both the RS485 industrial communication circuit and the NFC transmitting antenna assembly is provided by a dedicated power supply circuit, such as... Figure 8 A DC-DC conversion diagram of an electrically isolated membrane electrode power supply system and Figure 9 The LDO voltage regulator diagram of an electrically isolated membrane electrode power supply system is shown. The two form a two-stage power supply architecture to provide stable power to all components of the NFC adapter, specifically: The power supply circuit adopts a two-stage architecture of DC-DC conversion and LDO regulation. The DC-DC conversion chip LV2842XLVDDCR converts the +24V voltage input from the field power supply terminal to +5V to power the USB general communication circuit. The LDO regulator chip TPS78233DDCR converts +5V to 3V3 to power the NFC transmitter and receiver front-end, NFC adapter MCU and RS485 industrial communication circuit. The circuit is equipped with filtering components to suppress ripple, and the reserved enable pin SHDN# is controlled by the NFC adapter MCU to turn off the power to reduce power consumption when there is no valid electrode host.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A membrane electrode power supply system based on electrical isolation, characterized in that, include: The electrode host includes a membrane electrode sensing component, a processing circuit board, a two-wire loop power supply and output terminal, and an NFC wireless interaction module. The NFC wireless interaction module is a built-in component of the electrode host. The membrane electrode sensing component, the two-wire loop power supply and output terminal, and the NFC wireless interaction module are electrically connected to the processing circuit board to realize signal interaction and processing. The electrode host supports dual power supply paths, with a two-wire loop power supply as the first power supply path and NFC wireless power supply as the second power supply path, and the two power supply paths are independent of each other.

2. The membrane electrode power supply system based on electrical isolation according to claim 1, characterized in that, The processing circuit board includes: The processing circuit board includes an analog front end, a low-power microcontroller, a loop power supply circuit, an NFC communication circuit, and power supply switching and voltage regulation components. The loop power supply circuit is used to adapt to two-wire loop power supply, the NFC communication circuit is used to adapt to NFC wireless power supply, and the power supply switching and voltage regulation components are used to realize the switching of dual power supply paths.

3. The membrane electrode power supply system based on electrical isolation according to claim 2, characterized in that, The loop power supply circuit includes: The loop power supply circuit includes a rectifier element and a power management element; the rectifier element is connected to the two-wire loop power supply and output terminal to realize the positive and negative connection self-adaptation of the two-wire loop power supply; the power management element converts the connected loop power supply into a first supply voltage and outputs it to the power supply switching and voltage regulation element.

4. The membrane electrode power supply system based on electrical isolation according to claim 2, characterized in that, The NFC communication circuit includes: The NFC communication circuit includes an energy harvesting element, which is connected to the NFC wireless interaction module. It harvests NFC wireless energy through near-field coupling, converts it into a second power supply voltage, and outputs it to the power supply switching and voltage regulation element.

5. A membrane electrode power supply system based on electrical isolation according to claim 2, characterized in that, The power supply switching and voltage regulation components include: The power supply switching and voltage regulation components include a diode selection network and a dual-channel voltage regulator chip. The diode selection network includes a first diode and a second diode. The anode of the first diode is connected to the first power supply voltage terminal corresponding to the two-wire loop power supply, and the anode of the second diode is connected to the second power supply voltage terminal corresponding to the NFC wireless power supply. The cathodes of both diodes are connected to the dual-channel voltage regulator chip. The output voltage of the dual-channel voltage regulator chip powers the analog front end of the processing circuit board and the low-power microcontroller, realizing the switching of dual power supply paths.

6. The membrane electrode power supply system based on electrical isolation according to claim 1, characterized in that, The NFC wireless interaction module includes: The NFC wireless interaction module includes an NFC antenna, which receives external NFC wireless power and transmits it to the energy harvesting element of the NFC communication circuit; it supports bidirectional data exchange with smartphone NFC.

7. The membrane electrode power supply system based on electrical isolation according to claim 1, characterized in that, The two-wire loop power supply and output terminals include: The two-wire loop power supply and output terminals include a power supply input terminal, which is connected to the rectifier element of the loop power supply circuit for accessing the two-wire loop power supply. It works with the rectifier element to achieve adaptive access for the positive and negative connections of the first power supply path.

8. The membrane electrode power supply system based on electrical isolation according to claim 1, characterized in that, The electrode host also includes: An NFC adapter is provided, which can establish a communication connection with an NFC wireless interaction module to achieve power supply and bidirectional data exchange.

9. A membrane electrode power supply system based on electrical isolation according to claim 8, characterized in that, The NFC adapter includes: The NFC adapter includes an NFC transmitting antenna assembly, an adapter processing circuit board, and a packaging structure. The NFC adapter is connected to the electrode host through the packaging structure. The adapter processing circuit board includes a power supply circuit, an industrial communication circuit, and a general communication circuit. The power supply circuit is connected to an external power source and converted to a suitable power supply voltage; the NFC transmitting antenna assembly, driven by the power supply circuit, transmits wireless energy to the NFC wireless interaction module of the electrode host, providing an energy source for the second power supply path; the industrial communication circuit is adapted to the industrial controller and supports serial communication protocols; the general communication circuit is adapted to the computer terminal and supports virtual serial port protocols.

10. A membrane electrode power supply method based on electrical isolation, using the membrane electrode power supply system based on electrical isolation according to any one of claims 1-9, characterized in that, include: After the system starts up, it is connected to the two-wire loop power supply and the output terminal to form the first power supply path and output the first power supply voltage. When the NFC adapter is configured, the NFC adapter is connected to the external power supply, which is converted into the adaptation voltage by the power supply circuit. Then, the wireless energy is transmitted to the NFC wireless interaction module through the NFC transmitting antenna component, and then converted into the second power supply voltage by the energy harvesting element to form the second power supply path. Based on the power supply switching and the selection network composed of the first and second diodes in the voltage regulator components of the processing circuit board, automatic switching of the power supply path is realized. When the two-wire loop power supply and the NFC adapter power supply are connected in parallel, the first and second diodes select the power supply path with the higher voltage to conduct. When only the two-wire loop power supply is connected, the first diode conducts and the second diode is cut off, and the first supply voltage is used for power supply. When the two-wire loop power supply is disconnected and the NFC adapter is configured, the second diode conducts and the first diode is cut off, and the system switches to the second supply voltage. The power supply voltage, which is turned on by the gating network, is regulated by a dual-channel voltage regulator chip, and the output stable voltage supplies power to the analog front end of the processing circuit board and the low-power microcontroller respectively. During system operation, the power supply status is monitored in real time. When the current power supply path is interrupted, the system switches to another power supply path through the diode gating network.

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