Device for measuring dielectric capacitance parameter of dielectric barrier discharge device
Patent Information
- Application Number
- CN202522070609.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-09-25
AI Technical Summary
[0005]本申请通过提供一种介质阻挡放电装置的介质电容参数测量装置，解决了现有技术中DBD介质电容参数测量装置存在操作复杂、精度低的技术问题，实现了高精度、低成本、便捷化的DBD介质电容参数测量
[0022]1.该介质电容参数测量装置操作便捷，装置集成主电路模块、驱动模块和主控芯片模块，输入端直接连接直流电源，输出端直接连接DBD装置电极，无需复杂接线，通过固定谐振电感与DBD装置构成谐振回路，结合电流传感器实时检测电流信号，确保参数测量的准确性；
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Figure CN224788844U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dielectric barrier discharge technology, and in particular to a dielectric capacitance parameter measuring device for a dielectric barrier discharge device. Background Technology
[0002] Dielectric barrier discharge (DBD) is a gas discharge technique that involves placing an insulating dielectric between two electrodes. DBD can produce non-equilibrium plasma in a pressure range from low to atmospheric, and this technology is widely used in various fields such as ozone generation, waste gas treatment, chemical analysis, and materials processing.
[0003] Because of the presence of an insulating dielectric barrier layer, the structure of a DBD (Dielectric Degrader) is similar to that of a capacitor. Therefore, a DBD device can be considered as a capacitor consisting of electrodes, a dielectric layer, and a discharge gap. Consequently, a high-voltage alternating current must be applied across the electrodes for the DBD device to achieve stable discharge. Applying too low a voltage to the electrodes will lead to discharge failure, while applying too high a voltage will cause damage to the dielectric layer. Since the DBD dielectric capacitance parameter directly affects the breakdown voltage, measuring the DBD dielectric capacitance parameter is crucial for designing the electrode voltage.
[0004] Common methods for calculating DBD dielectric capacitance parameters include the Lissajous graph method, emission spectroscopy method, and geometric calculation method. While the geometric calculation method is simple to operate, its measurement accuracy is low, making it unsuitable for devices requiring high-precision DBD parameters. The Lissajous graph method uses the XY mode of an oscilloscope to acquire voltage-charge Lissajous graphs, offering higher accuracy than the geometric calculation method. A standard Lissajous graph presents a parallelogram shape, and DBD circuit parameters are calculated from the slopes of the four sides. However, at high frequencies, the Lissajous graph distorts into a warped circle, making it difficult to obtain accurate parameters from the graph. Therefore, this method has significant errors at high frequencies. The emission spectroscopy method requires expensive equipment such as spectrometers and demands a high level of expertise, making it difficult to operate. Currently, there is a lack of high-precision, low-cost, and easy-to-operate DBD dielectric capacitance parameter measurement devices. Utility Model Content
[0005] This application provides a dielectric capacitance parameter measuring device for a dielectric barrier discharge (DBD) device, which solves the technical problems of complex operation and low accuracy in existing DBD dielectric capacitance parameter measuring devices, and realizes high-precision, low-cost, and convenient DBD dielectric capacitance parameter measurement.
[0006] This application provides a dielectric capacitance parameter measuring device for a dielectric barrier discharge device, comprising:
[0007] The main circuit module has an input terminal connected to a DC power supply and an output terminal connected to the two electrodes of the dielectric barrier discharge device under test. The main circuit module includes an inverter full-bridge, a fixed resonant inductor, and a current sensor. The input terminal of the inverter full-bridge is the input terminal of the main circuit module. The output terminal of the inverter full-bridge is formed by connecting the fixed resonant inductor in series. The current sensor is set on the output branch of the inverter full-bridge to detect the output current of the inverter full-bridge.
[0008] The drive module is electrically connected to the main circuit module and is used to drive the main circuit module to operate;
[0009] The main control chip module is electrically connected to both the drive module and the main circuit module, and is used to output control signals to the drive module and receive detection signals fed back by the main circuit module.
[0010] The advantages of the above embodiment are as follows: the dielectric capacitance parameter measuring device is connected to a DC power supply at its input and directly connected to the two electrodes of the DBD device at its output. During measurement, it captures the operating frequency at the point of maximum current, which is the resonant frequency. By measuring the resonant frequency and the fixed inductance value within the device, the DBD parameter value can be calculated according to a fixed formula. This dielectric capacitance parameter measuring device is easy to operate, requires few devices, has high accuracy, and can meet the parameter measurement requirements at all DBD operating frequencies.
[0011] Based on the above embodiments, this application can be further improved as follows:
[0012] In one embodiment of this application, the input terminal of the main circuit module is provided with a first interface J1 and a second interface J2, wherein the first interface J1 is used to connect to the positive terminal of the DC power supply, and the second interface J2 is used to connect to the negative terminal of the DC power supply.
[0013] The output terminal of the main circuit module is provided with a third interface J3 and a fourth interface J4, which are used to connect the two electrodes of the dielectric barrier discharge device under test, respectively.
[0014] In one embodiment of this application, the inverter full bridge includes four switching transistors, namely a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3 and a fourth switching transistor Q4, which constitute an inverter full bridge.
[0015] In one embodiment of this application, the drive module is configured to receive four PWM signals PWM1, PWM2, PWM3, and PWM4 output by the main control chip module, and output four drive signals G1, G2, G3, and G4, which are respectively connected to the inverter full bridge in the main circuit module. By precisely controlling the output of the drive module through the PWM signals, the switching frequency of the inverter full bridge can be flexibly adjusted, achieving dynamic tracking of the resonant frequency, meeting the operating frequency requirements of different DBD devices, and expanding the applicability of the device.
[0016] In one embodiment of this application, the inverter full bridge further includes four resistors R1, R2, R3, and R4. The four drive signals G1, G2, G3, and G4 are respectively connected to the four switching transistors of the inverter full bridge through the four resistors R1, R2, R3, and R4. The resistors serve as current limiting protection, preventing overcurrent of the drive signals from damaging the switching transistors, improving the operating stability and service life of the device, and reducing maintenance costs.
[0017] In one embodiment of this application, the main control chip module includes a main control chip U7 and a serial port screen interface P1;
[0018] The signal input terminal of the main control chip U7 is electrically connected to the output terminal ADCIN1 of the current sensor in the main circuit module, and is used to receive the current signal detected by the current sensor.
[0019] The signal output terminal of the main control chip U7 is electrically connected to the signal input terminal of the drive module, and is used to output PWM control signals to the drive module;
[0020] The serial port screen interface P1 is electrically connected to the main control chip U7 and is used to connect to an external display device to display measurement results. The main control chip can process the current signal and adjust the PWM frequency in real time to realize automated parameter measurement; the serial port screen interface directly outputs the results without the need for additional data post-processing, solving the problem of complex operation in the prior art and improving user convenience.
[0021] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:
[0022] 1. This dielectric capacitance parameter measuring device is easy to operate. The device integrates a main circuit module, a drive module, and a main control chip module. The input end is directly connected to a DC power supply, and the output end is directly connected to the electrodes of the DBD device. No complicated wiring is required. A resonant circuit is formed with the DBD device through a fixed resonant inductor. Combined with a current sensor to detect the current signal in real time, the accuracy of parameter measurement is ensured.
[0023] 2. This dielectric capacitance parameter measuring device has a wide range of applications. It can be adapted to DBD devices with different operating frequencies by adjusting the PWM signal frequency, thus meeting the parameter measurement requirements of the entire frequency range.
[0024] 3. This dielectric capacitance parameter measurement device is low in cost and does not require expensive equipment such as oscilloscopes and spectrometers, thus reducing hardware costs. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0026] Figure 1 This is a schematic diagram of the dielectric barrier discharge structure in an embodiment of this application;
[0027] Figure 2 This is a schematic diagram of the equivalent circuit for dielectric barrier discharge in an embodiment of this application, wherein... Figure 2 (a) is the equivalent model when no discharge occurs. Figure 2 (b) is the equivalent model when discharge occurs;
[0028] Figure 3 This is a circuit diagram of a dielectric capacitance parameter measuring device for a dielectric barrier discharge apparatus according to an embodiment of this application;
[0029] Figure 4 This is a circuit diagram of the main circuit module in an embodiment of this application;
[0030] Figure 5 This is a circuit diagram of the driving module in an embodiment of this application;
[0031] Figure 6 This is a circuit diagram of the main control chip module in an embodiment of this application;
[0032] Figure 7 This is a flowchart of the parameter measurement process in an embodiment of this application. Detailed Implementation
[0033] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0036] The dielectric barrier discharge structure referred to in this application is as follows: Figure 1 As shown, a dielectric film of thickness d is deposited on each of the two parallel electrode plates. An AC power supply is connected to the positive and negative electrode plates, driving gas discharge between the dielectric plates. The equivalent circuit diagram of dielectric barrier discharge is shown below. Figure 2 As shown, Figure 2 (a) is the circuit model when no discharge occurs, where C d Indicates dielectric capacitance, C g This represents the air gap capacitance. When the AC voltage U ab Discharge begins after the volume increases to a level sufficient to break down the gas between the dielectric barrier layers. The equivalent model during discharge is as follows: Figure 2 As shown in (b). When the DBD is not discharging, C can be easily measured using a conventional LCR bridge. d and C g The difficulty lies in measuring the total series capacitance (C) separately during DBD discharge. d Therefore, a method is needed to measure the dielectric capacitance C during discharge. d Improved methods.
[0037] This application provides a dielectric capacitance parameter measuring device for a dielectric barrier discharge (DBD) device, which solves the technical problems of complex operation and low accuracy in existing DBD dielectric capacitance parameter measuring devices, and realizes high-precision, low-cost, and convenient DBD dielectric capacitance parameter measurement.
[0038] The technical solution in this application is to solve the above problems, and the overall approach is as follows:
[0039] Example:
[0040] like Figure 3 As shown, a dielectric capacitance parameter measuring device for a dielectric barrier discharge device includes a main circuit module, a drive module, and a main control chip module.
[0041] Main circuit module such as Figure 4 As shown, J1 and J2 are respectively connected to DC voltage source U. in The positive and negative terminals of the inverter, along with switching transistors Q1, Q2, Q3, and Q4, form a full-bridge inverter. A fixed resonant inductor L1 and a current sensor U5 are located on the output branch of the full-bridge inverter. J3 and J4 are connected to the positive and negative electrodes of the DBD device under test, respectively. The current sensor U5 detects the output current and outputs an inverter current signal ADCIN1, which is then transmitted to the main control chip U7.
[0042] Driver modules such as Figure 5 As shown, the input terminals of U1, U2, U3, and U4 receive four variable frequency PWM signals transmitted by the main control chip U7, and output drive signals G1, G2, G3, and G4, which are connected to the control terminals of the switching transistors Q1, Q2, Q3, and Q4 in the inverter full bridge through resistors R1, R2, R3, and R4, respectively, to drive the switching transistors to turn on / off at a preset frequency.
[0043] Main control chip module such as Figure 6 As shown, its signal input terminal (pin 11) is connected to the output terminal ADCIN1 of the current sensor U5 for acquiring current signals; the main control chip adjusts the output PWM frequency according to the preset program, and the signal output terminal outputs four PWM signals (PWM1-PWM4) to the drive module; the serial port screen interface P1 (such as the USART interface) is connected to an external serial port screen for displaying measurement results.
[0044] During operation, the DC power supply is input to the main circuit module via J1 and J2. The main control chip U7 controls the inverter full bridge through the drive module to convert the DC power into AC power, which is then applied to the DBD device under test through the fixed resonant inductor L1. The current sensor U5 detects the output current in real time and feeds it back to the main control chip U7. The main control chip U7 adjusts the frequency of the PWM signal to make the circuit reach the resonant state, and finally displays the DBD parameter measurement results through the serial port screen.
[0045] The measurement process is as follows Figure 7 As shown:
[0046] The main control chip U7 increases the PWM drive frequency according to the preset program and detects the inverter current signal ADCIN1;
[0047] When the inverter current signal ADCIN1 reaches its maximum, the corresponding PWM frequency f0 is the resonant frequency of the inductor L1 and the dielectric capacitance Cd.
[0048] according to The value of the dielectric capacitance Cd can be derived.
[0049] The main control chip U7 displays the calculated capacitance value directly to the serial port screen via serial communication.
[0050] Optionally, the current sensor U5 can be a CC6920 series (such as CC6920SO-40A or CC6920SO-50A); the drive modules U1-U4 can be IXDD614Y1 (high-speed gate driver, one for each of U1-U4); and the main control chip U7 can be an STM32F103C8T6 (ARM Cortex-M3 core microcontroller).
[0051] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:
[0052] 1. This dielectric capacitance parameter measuring device is easy to operate. The device integrates a main circuit module, a drive module, and a main control chip module. The input end is directly connected to a DC power supply, and the output end is directly connected to the electrodes of the DBD device. No complicated wiring is required. A resonant circuit is formed with the DBD device through a fixed resonant inductor. Combined with a current sensor to detect the current signal in real time, the accuracy of parameter measurement is ensured.
[0053] 2. This dielectric capacitance parameter measuring device has a wide range of applications. It can be adapted to DBD devices with different operating frequencies by adjusting the PWM signal frequency, thus meeting the parameter measurement requirements of the entire frequency range.
[0054] 3. This dielectric capacitance parameter measurement device is low in cost, eliminating the need for expensive equipment such as oscilloscopes and spectrometers, thus reducing hardware costs;
[0055] 4. The dielectric capacitance parameter measurement device provides intuitive results: it can directly output measurement results via a serial port screen interface connected to a display device, without the need for additional data post-processing.
[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A dielectric capacitance parameter measuring device for a dielectric barrier discharge device, characterized in that, include: The main circuit module has an input terminal connected to a DC power supply and an output terminal connected to the two electrodes of the dielectric barrier discharge device under test. The main circuit module includes an inverter full-bridge, a fixed resonant inductor, and a current sensor. The input terminal of the inverter full-bridge is the input terminal of the main circuit module. The output terminal of the inverter full-bridge is formed by connecting the fixed resonant inductor in series. The current sensor is set on the output branch of the inverter full-bridge to detect the output current of the inverter full-bridge. The drive module is electrically connected to the main circuit module and is used to drive the main circuit module to operate; The main control chip module is electrically connected to both the drive module and the main circuit module, and is used to output control signals to the drive module and receive detection signals fed back by the main circuit module.
2. The dielectric capacitance parameter measuring device according to claim 1, characterized in that: The main circuit module has a first interface J1 and a second interface J2 at its input terminal. The first interface J1 is used to connect to the positive terminal of the DC power supply, and the second interface J2 is used to connect to the negative terminal of the DC power supply. The output terminal of the main circuit module is provided with a third interface J3 and a fourth interface J4, which are used to connect the two electrodes of the dielectric barrier discharge device under test, respectively.
3. The dielectric capacitance parameter measuring device according to claim 1, characterized in that: The inverter full bridge includes four switching transistors, namely the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3 and the fourth switching transistor Q4, which constitute the inverter full bridge.
4. The dielectric capacitance parameter measuring device according to claim 1, characterized in that: The drive module is configured to receive four PWM signals PWM1, PWM2, PWM3, and PWM4 output by the main control chip module, and output four drive signals G1, G2, G3, and G4. The four drive signals are respectively connected to the inverter full bridge in the main circuit module.
5. The dielectric capacitance parameter measuring device according to claim 4, characterized in that: The inverter full bridge also includes four resistors R1, R2, R3, and R4. The four drive signals G1, G2, G3, and G4 are respectively connected to the four switching transistors of the inverter full bridge through the four resistors R1, R2, R3, and R4.
6. The dielectric capacitance parameter measuring device according to claim 4, characterized in that: The main control chip module includes a main control chip U7 and a serial port screen interface P1; The signal input terminal of the main control chip U7 is electrically connected to the output terminal of the current sensor in the main circuit module, and is used to receive the current signal detected by the current sensor. The signal output terminal of the main control chip U7 is electrically connected to the signal input terminal of the drive module, and is used to output PWM control signals to the drive module; The serial port screen interface P1 is electrically connected to the main control chip U7 and is used to connect to an external display device to display the measurement results.