Cell voltage monitoring circuit and device

Abstract

The invention discloses a cell voltage monitoring circuit and equipment. The cell voltage monitoring circuit comprises a voltage acquisition module, an isolation module and a monitoring module. The voltage acquisition module accesses a to-be-monitored cell voltage signal and is used for converting the acquired to-be-monitored cell voltage signal into a digital signal; the isolation module comprises a power isolation unit and a digital isolation unit, the digital isolation unit is connected with the voltage acquisition module and used for isolating and transmitting digital signals to the monitoring module, and the power isolation unit is connected with a first power signal and connected with the voltage acquisition module; the power isolation unit is used for isolating and outputting the first power signal to the voltage acquisition module; and the monitoring module is connected with the digital isolation unit and is used for monitoring the voltage signal of the to-be-monitored cell according to the digital signal output by the digital isolation unit. According to the cell voltage monitoring circuit provided by the invention, high voltage can be effectively isolated, and the safety of the monitoring circuit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit design, and in particular to a cell voltage monitoring circuit and equipment. Background Art

[0002] The electrolyzer is the core device in the water electrolysis hydrogen production equipment. The cell voltage of the electrolyzer reflects the working status of the electrolyzer. Therefore, real-time monitoring of the cell voltage of the electrolyzer is of great significance to the safety of the equipment.

[0003] During the electrolysis process, the voltage of each electrolytic cell chamber is about 1.8V, but the entire electrolytic cell system may contain dozens to hundreds of chambers, so the accumulated input voltage is very high. When monitoring the voltage, the traditional chamber voltage monitoring system generally uses optocoupler isolation and other methods to isolate the input and monitoring signals, but it is often difficult to ensure sufficient electrical insulation safety. Once the insulation fails, the high voltage may directly enter the control room, causing serious safety accidents. Summary of the invention

[0004] The present invention provides a cell voltage monitoring circuit and device to solve the problem in the prior art that it is difficult to ensure sufficient electrical insulation safety.

[0005] According to one aspect of the present invention, a cell voltage monitoring circuit is provided, comprising a voltage acquisition module, an isolation module and a monitoring module;

[0006] The voltage acquisition module is connected to the voltage signal of the chamber to be monitored, and the voltage acquisition module is used to convert the collected voltage signal of the chamber to be monitored into a digital signal;

[0007] The isolation module includes a power isolation unit and a digital isolation unit, the digital isolation unit is connected to the voltage acquisition module, the digital isolation unit is used to isolate and transmit the digital signal to the monitoring module, the power isolation unit is connected to the first power signal, the power isolation unit is connected to the voltage acquisition module, and the power isolation unit is used to isolate and output the first power signal to the voltage acquisition module;

[0008] The monitoring module is connected to the digital isolation unit, and is used to monitor the voltage signal of the chamber to be monitored according to the digital signal output by the digital isolation unit.

[0009] Optionally, the power isolation unit includes an isolation transformer, the input end of the isolation transformer is connected to the first power end, the output end of the isolation transformer is connected to the voltage acquisition module, and the isolation transformer is used to isolate and output the first power supply signal and supply power to the voltage acquisition module.

[0010] Optionally, the digital isolation unit includes a first signal conversion subunit, a second signal conversion subunit, a transmitting end and a receiving end, the first end of the first signal conversion subunit is connected to the input end of the digital isolation unit, the second end of the first signal conversion subunit is connected to the transmitting end, the first signal conversion subunit is used to convert the input digital signal into an electric field signal and output it through the transmitting end, the receiving end is used to receive the electric field signal of the transmitting end, the first end of the second signal conversion subunit is connected to the receiving end, the second end of the second signal conversion subunit is connected to the output end of the digital isolation unit, and the second signal conversion subunit is used to convert the electric field signal of the receiving end into a digital signal.

[0011] Optionally, the voltage acquisition module includes an input unit and an analog-to-digital conversion unit, the analog-to-digital conversion unit is connected to the input unit, the input unit is connected to at least one voltage signal of the chamber to be monitored, the input unit is used to transmit the connected voltage signal of the chamber to be monitored to the analog-to-digital conversion unit, and the analog-to-digital conversion unit is used to convert the analog signal into a digital signal.

[0012] Optionally, the input unit includes at least one input channel, and the input channel includes a first resistor, a first inductor and a first capacitor. The first end of the first resistor is connected to the voltage signal of the chamber to be monitored, the second end of the first resistor is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the first capacitor and the analog-to-digital conversion unit, the second end of the first capacitor is grounded, and a first diode is connected between the at least one input channel.

[0013] Optionally, the analog-to-digital conversion unit includes an analog-to-digital conversion chip, and the analog-to-digital conversion chip is used to convert an input analog signal into a digital signal.

[0014] Optionally, the monitoring module includes a control unit, a power supply unit and a current detection unit, the control unit is connected to the isolation module, the control unit is used to perform voltage monitoring according to the digital signal output by the isolation module, the power supply unit is connected to the control unit, the power supply unit is used to power the control unit, the current detection unit is connected to the control unit and the power supply unit, the current detection unit is used to detect the working current of the power supply unit and output a detection signal, and the control unit is also used to determine the working status of the power supply unit based on the detection signal.

[0015] Optionally, the power supply unit includes a power conversion chip, an input end of the power conversion chip is connected to the first power signal, and the power conversion chip is used to convert the first power signal into a second power signal.

[0016] Optionally, the control unit includes a microcontroller, the current detection unit includes a current detection chip, the input end of the current detection chip is connected to the power supply unit, and the output end of the current detection chip is connected to the microcontroller.

[0017] According to another aspect of the present invention, there is provided a device comprising the chamber voltage monitoring circuit.

[0018] The technical solution of the embodiment of the present invention provides a chamber voltage monitoring circuit, wherein a voltage acquisition module is connected to the chamber voltage signal to be monitored, and the voltage acquisition module converts the acquired chamber voltage signal to be monitored into a digital signal. The isolation module includes a power isolation unit and a digital isolation unit. The power isolation unit is provided to isolate and output the first power signal to the voltage acquisition module, and the digital isolation unit is provided to isolate and transmit the digital signal to the monitoring module. The digital isolation unit is provided to realize the isolated transmission of the digital signal in the form of capacitive coupling transmission, which can isolate high voltage, effectively avoid electromagnetic interference, improve the safety of the monitoring circuit, and solve the problem of difficulty in ensuring sufficient electrical insulation safety in the prior art.

[0019] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0021] Figure 1 It is a structural schematic diagram of a cell voltage monitoring circuit provided by an embodiment of the present invention;

[0022] Figure 2 is a circuit diagram of an isolation module provided by an embodiment of the present invention;

[0023] Figure 3 is a circuit diagram of a boost unit provided by an embodiment of the present invention;

[0024] Figure 4 is a circuit diagram of an input unit provided by an embodiment of the present invention;

[0025] Figure 5 is a circuit diagram of an analog-to-digital conversion unit provided by an embodiment of the present invention;

[0026] Figure 6is a circuit diagram of a power supply unit provided in an embodiment of the present invention;

[0027] Figure 7 is a circuit diagram of a control unit provided by an embodiment of the present invention;

[0028] Figure 8 is a circuit diagram of a current detection unit provided by an embodiment of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of a device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] The embodiment of the present invention provides a cell voltage monitoring circuit. Figure 1 is a schematic diagram of a cell voltage monitoring circuit provided by an embodiment of the present invention. Figure 1As shown, the chamber voltage monitoring circuit 100 includes a voltage acquisition module 110, an isolation module 120 and a monitoring module 130; the voltage acquisition module 110 is connected to the chamber voltage signal to be monitored, and the voltage acquisition module 110 is used to convert the collected chamber voltage signal to be monitored into a digital signal; the isolation module 120 includes a power isolation unit 121 and a digital isolation unit 122, the digital isolation unit 122 is connected to the voltage acquisition module 110, and the digital isolation unit 122 is used to isolate and transmit the digital signal to the monitoring module 130, the power isolation unit 121 is connected to the first power signal, the power isolation unit 121 is connected to the voltage acquisition module 110, and the power isolation unit 121 is used to isolate and output the first power signal to the voltage acquisition module 110; the monitoring module 130 is connected to the digital isolation unit 122, and the monitoring module 130 is used to monitor the chamber voltage signal to be monitored according to the digital signal output by the digital isolation unit 122.

[0033] In this embodiment, the cell voltage monitoring circuit 100 is a circuit for monitoring the voltage of each cell in the electrolytic cell. By monitoring the voltage of the cell, abnormal conditions in the electrolysis process can be discovered in time. The voltage acquisition module 110 is a module for collecting the voltage of each cell. The voltage acquisition module 110 can collect multiple cell voltages, which is specifically determined by the number of cells to be monitored. The isolation module 120 is a module for isolating the cell voltage and the signal interference between the monitoring module 130, which improves the stability and accuracy of data transmission. The digital isolation unit 122 is a unit for isolating and transmitting digital signals. It adopts the form of capacitive coupling and transmits signals based on non-conductive media (electric fields), thereby realizing circuit isolation. The power isolation unit 121 is a unit for isolating and transmitting power signals. For example, the power isolation unit 121 includes a transformer. The monitoring module 130 is a module for monitoring the cell voltage signal. For example, the monitoring module 130 includes a data processing device such as a controller.

[0034] In this embodiment, the voltage acquisition module 110 also includes a horn socket and a port protection device. The port protection device can be a transient voltage suppression diode, which can prevent surge pulses from damaging the subsequent circuit components. The voltage acquisition module 110 accesses the voltage signal of the chamber to be monitored through the horn socket, and converts the collected voltage signal of the chamber to be monitored into a digital signal. The digital isolation unit 122 isolates the digital signal and transmits it to the monitoring module 130. The monitoring module 130 monitors the voltage signal of the chamber according to the received digital signal. The power isolation unit 121 isolates and outputs the first power signal to the voltage acquisition module 110 to supply power to the voltage acquisition module 110.

[0035] The technical solution of this embodiment provides a chamber voltage monitoring circuit, in which a voltage acquisition module is connected to the voltage signal of the chamber to be monitored, and the voltage acquisition module converts the acquired voltage signal of the chamber to be monitored into a digital signal. The isolation module includes a power isolation unit and a digital isolation unit. The power isolation unit is set to isolate the first power signal and output it to the voltage acquisition module. The digital isolation unit is set to isolate the digital signal and transmit it to the monitoring module. The digital isolation unit adopts capacitive coupling transmission to realize isolated transmission of digital signals, which can isolate high voltage, effectively avoid electromagnetic interference, improve the safety of the monitoring circuit, and solve the problem of difficulty in ensuring sufficient electrical insulation safety in the prior art.

[0036] Figure 2 is a circuit diagram of an isolation module provided by an embodiment of the present invention, such as Figure 2 As shown, the power isolation unit 121 includes an isolation transformer T1, the input end of the isolation transformer T1 is connected to the first power end V1, the output end of the isolation transformer T1 is connected to the voltage acquisition module 110, and the isolation transformer T1 is used to isolate and output the first power signal and supply power to the voltage acquisition module 110.

[0037] In this embodiment, the isolation transformer T1 is based on the law of electromagnetic induction. The output winding induces an electromotive force corresponding to the input winding to achieve power transfer, while ensuring that the electrical isolation performance between the input (DC-DC primary) and output (DC-DC secondary) circuits meets safety standards and application requirements. The isolation transformer T1 has a strong anti-interference ability to avoid interfering with other electronic devices or being interfered with by other devices. Among them, the voltage of the first power supply signal output by the first power supply terminal V1 is 5V. The voltage acquisition module 110 also includes a boost unit, Figure 3 is a circuit diagram of a boost unit provided in an embodiment of the present invention, such as Figure 3 As shown, the boost unit includes a boost chip U1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a second inductor L2, a second diode D2, a third diode D3, a second resistor R2 and a third resistor R3. The boost chip U1 includes a pin SHDN, a pin Vin, a pin SW, a pin GND and a pin FB. The pin Vin is connected to the first power signal output by the isolation transformer T1. The boost unit boosts the first power signal and outputs a third power signal V3 to power the voltage acquisition module 110, wherein the voltage of the third power signal V3 is 12V.

[0038] Continue to refer Figure 2The digital isolation unit 122 includes a first signal conversion subunit A1, a second signal conversion subunit A2, a transmitting end S and a receiving end RX. The first end of the first signal conversion subunit A1 is connected to the input end of the digital isolation unit 122, and the second end of the first signal conversion subunit A1 is connected to the transmitting end S. The first signal conversion subunit A1 is used to convert the input digital signal into an electric field signal and output it through the transmitting end S. The receiving end RX is used to receive the electric field signal of the transmitting end S. The first end of the second signal conversion subunit A2 is connected to the receiving end RX, and the second end of the second signal conversion subunit A2 is connected to the output end of the digital isolation unit 122. The second signal conversion subunit A2 is used to convert the electric field signal of the receiving end RX into a digital signal.

[0039] In this embodiment, the digital isolation unit 122 is composed of four channels, each of which is composed of a first signal conversion subunit A1, a second signal conversion subunit A2, a transmitter S and a receiver RX. The digital isolation unit 122 can realize bidirectional signal transmission. The digital isolation unit 122 transmits signals based on a non-conductive medium (electric field), that is, it adopts the form of capacitive coupling (the transmitter S and the receiver RX form a capacitor) to realize the isolated transmission of digital signals. The digital isolation unit 122 effectively avoids adverse factors such as electromagnetic interference and electromagnetic pulses by isolating different parts of the circuit, providing a strong guarantee for the stable operation of the circuit.

[0040] Based on the above embodiment, the voltage acquisition module 110 includes an input unit and an analog-to-digital conversion unit. The analog-to-digital conversion unit is connected to the input unit. The input unit is connected to at least one voltage signal of the chamber to be monitored. The input unit is used to transmit the connected voltage signal of the chamber to be monitored to the analog-to-digital conversion unit. The analog-to-digital conversion unit is used to convert the analog signal into a digital signal.

[0041] In this embodiment, the input unit is a unit that connects the voltage of the chamber to be monitored to the voltage acquisition module 110. For example, the input unit can perform signal processing such as filtering and voltage stabilization on the voltage of the chamber to be monitored, so that the chamber voltage connected to the voltage acquisition module 110 is more stable. The analog-to-digital conversion unit is a unit that performs analog-to-digital conversion on the chamber voltage. The analog-to-digital conversion unit converts the analog signal of the connected chamber voltage into a corresponding digital signal. For example, when the voltage value of the chamber voltage exceeds a preset threshold value (abnormal), the digital signal output by the analog-to-digital conversion unit is a high-level signal. When the voltage value of the chamber voltage does not exceed the preset threshold value (normal), the digital signal output by the analog-to-digital conversion unit is a low-level signal.

[0042] Specifically, the input unit includes at least one input channel, and the input channel includes a first resistor R1, a first inductor L1 and a first capacitor C1. The first end of the first resistor R1 is connected to the voltage signal of the chamber to be monitored, the second end of the first resistor R1 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is connected to the first end of the first capacitor C1 and the analog-to-digital conversion unit, the second end of the first capacitor C1 is grounded, and a first diode D1 is connected between at least one input channel.

[0043] For example, Figure 4 is a circuit diagram of an input unit provided in an embodiment of the present invention, such as Figure 4 As shown, the input unit includes 16 input channels, which are connected to 16 cell voltages to be monitored (cell1-cell16) accordingly. The input unit also includes a fourth resistor R4, a first resistor R1 is an anti-surge resistor, and a first diode D1 is a transient voltage suppression diode. The first resistor R1 and the first diode D1 constitute the first-level protection circuit of the input unit, which mainly protects the circuit from overcurrent caused by excessive differential mode surge voltage between different input channels. By selecting the appropriate first resistor R1 and the first diode D1, the input unit can output the current limiting capacity and output voltage that meet the requirements. The first inductor L1 and the first capacitor C1 constitute the second-level protection circuit of the output unit. The first inductor L1 is a magnetic bead. The second-level protection circuit can be used as an LC low-pass filter, which mainly functions to filter out the high-frequency components of the input signal.

[0044] Specifically, Figure 5 is a circuit diagram of an analog-to-digital conversion unit provided in an embodiment of the present invention, such as Figure 5 As shown, the analog-to-digital conversion unit includes an analog-to-digital conversion chip U2 (i.e., an ADC chip), which is used to convert the input analog signal into a digital signal, and the digital signal is transmitted to the monitoring module 130 through the SPI (Serial Peripheral Interface) protocol. The analog-to-digital conversion unit also includes 16 signal amplification paths, which are respectively connected to the output ends (VC1-VC16) of the 16 input channels in the input unit, each amplification path includes a first operational amplifier Y1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8, and the positive input ends of two adjacent first operational amplifiers Y1 are connected to the negative input ends. The analog-to-digital conversion unit also includes an analog switch S and a temperature sensor, the analog switch S is used to select the voltage of the small chamber to be monitored, the temperature sensor converts the collected temperature signal into an electrical signal and transmits it to the ADC chip, the ADC chip converts the electrical signal into a corresponding digital signal and transmits it to the monitoring module through the isolation module, and the monitoring module adjusts the temperature according to the received signal to achieve temperature compensation and reduce the influence of environmental factors on the measurement results.

[0045] Based on the above embodiment, the monitoring module 130 includes a control unit, a power supply unit and a current detection unit. The control unit is connected to the isolation module 120, and the control unit is used to perform voltage monitoring according to the digital signal output by the isolation module 120. The power supply unit is connected to the control unit, and the power supply unit is used to power the control unit. The current detection unit is connected to the control unit and the power supply unit, and the current detection unit is used to detect the working current of the power supply unit and output a detection signal. The control unit is also used to determine the working status of the power supply unit based on the detection signal.

[0046] In this embodiment, the control unit is a unit that processes the received digital signal, and monitors whether the corresponding chamber voltage is normal according to the received digital signal. For example, the control unit includes a microcontroller. The power supply unit is a unit that provides power to the control unit to ensure the normal operation of the control unit. The current detection unit is a unit that detects the working current of the power supply unit. For example, when the current output by the power supply unit is within a preset range, the current detection unit outputs a high-level signal to the control unit, and the control unit operates normally. When the current output by the power supply unit is not within the preset range, the current detection unit outputs a low-level signal to the control unit, and the control unit stops working.

[0047] Specifically, Figure 6 is a circuit diagram of a power supply unit provided in an embodiment of the present invention, such as Figure 6 As shown, the power supply unit includes a power conversion chip U3, an input end of the power conversion chip U3 is connected to a first power signal, and the power conversion chip U3 is used to convert the first power signal into a second power signal.

[0048] In this embodiment, the power supply unit further includes a rail power supply terminal SR1, a fourth diode D4, a fifth diode D5, a sixth diode D6, a third inductor L3, a ninth resistor R9, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16 and a seventeenth capacitor C17, and the rail power supply terminal SR1 includes a 5V power supply terminal and a ground terminal. The power conversion chip U3 includes a pin IN, a pin OUT, a pin GND and a pin EN, the pin IN is connected to the first power signal, the pin OUT is connected to the second power terminal V2, and the second power signal is output, wherein the voltage value of the second power signal is 3.3V.

[0049] Figure 7 is a circuit diagram of a control unit provided by an embodiment of the present invention, Figure 8 is a circuit diagram of a current detection unit provided in an embodiment of the present invention, such as Figure 7 As shown, the control unit includes a microcontroller U4, such as Figure 8As shown, the current detection unit includes a current detection chip U5, an input end of the current detection chip U5 is connected to the power supply unit, and an output end of the current detection chip U5 is connected to the microcontroller U4.

[0050] In this embodiment, reference Figure 8 The current detection chip U5 includes pins REF, GND, Vcc, IN+, IN- and OUT. Pin Vcc is connected to the first power supply terminal V1, pin IN- is connected to the second power supply terminal V2, pin IN+ is connected to the fourth power supply terminal V4, and pin OUT outputs a detection signal. Figure 7 The microcontroller U4 includes pin PA2, pin SWDIO, pin VSS_3, pin VDD_3, pin SWCLK, pin VSS_1, pin VDD_1, pin VBAT, pin VDDA, pin PF0-OSC_OUT, pin PF0-OSC_IN, pin NRST, pin VSSA, pin VDDA, pin VSS_2, pin VDD_2, pin PA8 and pin PA9, and the control unit also includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a first crystal oscillator CY1, a seventh diode D7 and an eighth diode D8. Pin PA2 of the microcontroller U4 is connected to the detection signal output by the current detection unit. The control unit also includes a connector J1. Ports 1-4 of the connector J1 are connected to the digital signal output by the channel in the digital isolation unit 122. The microcontroller U4 monitors the cell voltage based on the received digital signal.

[0051] Based on the above embodiment, the chamber voltage monitoring circuit also includes an alarm module. The control unit monitors the received digital signal and outputs a monitoring signal. The monitoring signal is transmitted to the alarm module through a communication bus. The communication bus can use a CAN bus. When the monitoring signal is abnormal, the alarm module outputs an alarm signal so that timely measures can be taken to avoid safety accidents.

[0052] The embodiment of the present invention further provides a device, Fig. 9 is a schematic diagram of the structure of the device provided by the embodiment of the present invention, such as Fig. 9 As shown, the device 10 provided in this embodiment includes the cell voltage monitoring circuit 100 in any of the above embodiments. The device 10 is a monitoring device including the cell voltage monitoring circuit 100. The cell voltage monitoring circuit 100 in the above embodiment is applied to the device 10, so that the device 10 has the ability to isolate high voltage, and the high voltage isolation can reach 4000VAC, which effectively avoids electromagnetic interference, improves the safety of the device, and ensures electrical safety under extreme working conditions.

[0053] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0054] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cell voltage monitoring circuit, characterized in that: Including voltage acquisition module, isolation module and monitoring module; The voltage acquisition module is connected to the voltage signal of the chamber to be monitored, and the voltage acquisition module is used to convert the collected voltage signal of the chamber to be monitored into a digital signal; The isolation module includes a power isolation unit and a digital isolation unit, the digital isolation unit is connected to the voltage acquisition module, the digital isolation unit is used to isolate and transmit the digital signal to the monitoring module, the power isolation unit is connected to the first power signal, the power isolation unit is connected to the voltage acquisition module, and the power isolation unit is used to isolate and output the first power signal to the voltage acquisition module; The monitoring module is connected to the digital isolation unit, and is used to monitor the voltage signal of the chamber to be monitored according to the digital signal output by the digital isolation unit.

2. The cell voltage monitoring circuit according to claim 1, characterized in that: The power isolation unit includes an isolation transformer, the input end of the isolation transformer is connected to the first power end, the output end of the isolation transformer is connected to the voltage acquisition module, and the isolation transformer is used to isolate and output the first power signal and supply power to the voltage acquisition module.

3. The cell voltage monitoring circuit according to claim 1, characterized in that: The digital isolation unit includes a first signal conversion subunit, a second signal conversion subunit, a transmitting end and a receiving end. The first end of the first signal conversion subunit is connected to the input end of the digital isolation unit, the second end of the first signal conversion subunit is connected to the transmitting end, the first signal conversion subunit is used to convert the input digital signal into an electric field signal and output it through the transmitting end, the receiving end is used to receive the electric field signal of the transmitting end, the first end of the second signal conversion subunit is connected to the receiving end, the second end of the second signal conversion subunit is connected to the output end of the digital isolation unit, and the second signal conversion subunit is used to convert the electric field signal of the receiving end into a digital signal.

4. The cell voltage monitoring circuit according to claim 1, characterized in that: The voltage acquisition module includes an input unit and an analog-to-digital conversion unit, the analog-to-digital conversion unit is connected to the input unit, the input unit is connected to at least one voltage signal of the chamber to be monitored, the input unit is used to transmit the connected voltage signal of the chamber to be monitored to the analog-to-digital conversion unit, and the analog-to-digital conversion unit is used to convert the analog signal into a digital signal.

5. The cell voltage monitoring circuit according to claim 4, characterized in that: The input unit includes at least one input channel, and the input channel includes a first resistor, a first inductor and a first capacitor. The first end of the first resistor is connected to the voltage signal of the chamber to be monitored, the second end of the first resistor is connected to the first end of the first inductor, the second end of the first inductor is connected to the first end of the first capacitor and the analog-to-digital conversion unit, the second end of the first capacitor is grounded, and a first diode is connected between the at least one input channel.

6. The cell voltage monitoring circuit according to claim 4, characterized in that: The analog-to-digital conversion unit includes an analog-to-digital conversion chip, and the analog-to-digital conversion chip is used to convert an input analog signal into a digital signal.

7. The cell voltage monitoring circuit according to claim 1, characterized in that: The monitoring module includes a control unit, a power supply unit and a current detection unit. The control unit is connected to the isolation module, and the control unit is used to perform voltage monitoring according to the digital signal output by the isolation module. The power supply unit is connected to the control unit, and the power supply unit is used to supply power to the control unit. The current detection unit is connected to the control unit and the power supply unit, and the current detection unit is used to detect the working current of the power supply unit and output a detection signal. The control unit is also used to determine the working state of the power supply unit according to the detection signal.

8. The cell voltage monitoring circuit according to claim 7, characterized in that: The power supply unit includes a power conversion chip, an input end of the power conversion chip is connected to the first power signal, and the power conversion chip is used to convert the first power signal into a second power signal.

9. The cell voltage monitoring circuit according to claim 7, characterized in that: The control unit includes a microcontroller, the current detection unit includes a current detection chip, the input end of the current detection chip is connected to the power supply unit, and the output end of the current detection chip is connected to the microcontroller.

10. A device, characterized in that: It includes the chamber voltage monitoring circuit described in any one of claims 1-9.

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