Method, device and equipment for calculating peak voltage of dielectric barrier discharge load

Abstract

The invention discloses a dielectric barrier discharge load peak voltage calculation method, device and equipment. The peak current appearing moment is obtained through calculation by calculating the dielectric barrier discharge load current, the load current is sampled at the moment to obtain the maximum value of the load current, and the peak voltage of the dielectric barrier discharge load in one period is obtained through a preset fitting equation. Compared with a traditional method for obtaining the peak voltage of the load voltage through a high-voltage voltage transformer, the method provided by the invention has the advantages that the cost is low, and the operating characteristics of the dielectric barrier discharge load are not changed.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a method, device and equipment for calculating a dielectric barrier discharge load peak voltage. Background Art

[0002] In order for the dielectric barrier discharge load to produce a stable discharge phenomenon, the peak voltage applied to it must be stable. To keep the peak voltage on the dielectric barrier discharge load constant, voltage closed-loop control is required. However, to use voltage closed-loop control, the peak voltage of the dielectric barrier discharge load must be obtained in real time. The existing method of obtaining the peak voltage of the dielectric barrier discharge load is to connect a high-voltage transformer in parallel to the load and process the output signal of the high-voltage transformer to obtain the peak voltage of the dielectric barrier discharge load. This solution not only requires the use of expensive high-frequency high-voltage voltage transformers, but the parasitic parameters of the voltage transformer will also affect the operating state of the dielectric barrier discharge load.

[0003] Therefore, it is a technical problem that needs to be solved by those skilled in the art to provide a method, device and apparatus for calculating the peak voltage of a dielectric barrier discharge load that is low-cost and does not change the operating characteristics of the dielectric barrier discharge load. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, device and equipment for calculating the peak voltage of a dielectric barrier discharge load, which is used to solve the defects of the existing method that expensive high-frequency and high-voltage voltage transformers are required and the parasitic parameters of the voltage transformers will affect the operating state of the dielectric barrier discharge load.

[0005] To this end, the present invention provides a method for calculating the peak voltage of a dielectric barrier discharge load, characterized in that the calculation method performs the following steps, including:

[0006] Step 1: After the dielectric barrier discharge load operates normally, obtaining the operating current of the dielectric barrier discharge load through a current transformer;

[0007] Step 2: Inputting the working current into a first zero-crossing comparator to obtain a first square wave signal in phase with the working current;

[0008] Step 3: performing a difference operation on the current value of the working current and the previous value, and inputting the difference into a second zero-crossing comparator to obtain a second square wave signal;

[0009] Step 4: performing an AND operation on the first square wave signal and the second square wave signal to obtain a third square wave signal;

[0010] Step 5: When the falling edge of the third wave signal arrives, the working current is collected, and the value of the working current at this time is used as the maximum value of the load current in the current working cycle;

[0011] Step 6: Make U m (k) = k I I m (k) + C calculation to obtain the maximum value of the load voltage in this working cycle, where U m is the maximum value of the load voltage in the current working cycle, I m (k) is the maximum value of the load current in the current working cycle, k I and C are constants related to the dielectric barrier discharge load structure and gas characteristics, respectively;

[0012] In order to solve the above problems, this patent also provides a dielectric barrier discharge load peak voltage calculation device, which is characterized by including:

[0013] A current acquisition unit, configured to acquire a load current signal at a current sampling moment and a current input signal at a previous moment adjacent to the current sampling moment;

[0014] A current comparison unit, configured to perform a zero-crossing comparison on the working current input and to perform a zero-crossing comparison after taking the difference between the current at the current moment and the current at the previous moment;

[0015] The current peak sampling moment forming unit performs a logic AND operation on the output signals of the two current comparison units, and the falling edge of the formed signal is the current peak sampling moment;

[0016] The load voltage peak value calculation unit is used to perform mathematical operations on the working current peak current of the dielectric barrier discharge load to obtain the load voltage peak value of the current cycle.

[0017] In order to solve the above problems, this patent also provides a dielectric barrier discharge load peak voltage calculation device, which is characterized by including:

[0018] A memory for storing instructions, wherein the instructions include the steps of the method for calculating the dielectric barrier discharge load peak voltage;

[0019] A processor is configured to execute the instructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the calculation principle of dielectric barrier discharge load peak voltage

[0022] Figure 2 Flowchart of the method for calculating the peak voltage of dielectric barrier discharge load provided by the embodiment of the present invention

[0023] Figure 3 The dielectric barrier discharge load voltage waveform provided by the embodiment of the present invention

[0024] Figure 4 A comparison diagram of the actual peak value of the dielectric barrier discharge load voltage provided by an embodiment of the present invention and the voltage peak value obtained by the dielectric barrier discharge load peak voltage calculation method provided by the present invention DETAILED DESCRIPTION

[0025] The core of the present invention is to provide a method, device and equipment for calculating the peak voltage of a dielectric barrier discharge load, which is low-cost and does not change the operating characteristics of the dielectric barrier discharge load.

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0027] The following dielectric barrier discharge ozone generator is used as the dielectric barrier discharge load. The given dielectric barrier discharge ozone generator body parameters and power supply parameters and attached Figure 2 The present invention is described in further detail.

[0028] Ozone generator parameters: discharge voltage 1800V, air gap equivalent capacitance 0.1491μF, dielectric barrier capacitance 0.5749μF;

[0029] Power supply parameters: The circuit adopts a series resonant circuit, main circuit parameters: DC voltage 350V, resonant inductance: 29mH, step-up transformer primary-to-secondary turns ratio 1:4.

[0030] Step 1: Set the control current of the power supply to make the ozone generator work in a stable state;

[0031] Step 2: Use a current transformer with a suitable ratio to collect the working current of the ozone generator;

[0032] Step 3: Convert the current signal output by the transformer into a voltage signal;

[0033] Step 4: Input the voltage signal converted in step 3 into the zero-crossing comparator to obtain a first square wave signal in phase with the working current;

[0034] Step 5: Perform a difference operation on the current value of the working current and the previous value, and input the difference into another zero-crossing comparator to obtain a second square wave signal;

[0035] Step 6: Perform an AND operation on the first square wave signal and the second square wave signal to obtain a third square wave signal;

[0036] Step 7: When the falling edge of the third wave signal arrives, collect the working current to obtain the maximum value of the load current in the current working cycle;

[0037] Step 8: Make U m (k) = 18.4 × I m (k) + 102 operation to obtain the maximum value of the load voltage in this working cycle, where U m is the maximum value of the load voltage in the current working cycle, I m (k) is the maximum value of the load current in the current working cycle;

[0038] The above is a detailed introduction to the method, device and equipment for calculating the peak voltage of a dielectric barrier discharge load provided by the present invention. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in several ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0039] It should also be noted that, in this specification, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A method for calculating the peak voltage of a dielectric barrier discharge load, characterized in that: The calculation method performs the following steps, including: Step 1: After the dielectric barrier discharge load operates normally, obtaining the operating current of the dielectric barrier discharge load through a current transformer; Step 2: Inputting the working current into a first zero-crossing comparator to obtain a first square wave signal in phase with the working current; Step 3: performing a difference operation on the current value of the working current and the previous value, and inputting the difference into a second zero-crossing comparator to obtain a second square wave signal; Step 4: performing an AND operation on the first square wave signal and the second square wave signal to obtain a third square wave signal; Step 5: When the falling edge of the third wave signal arrives, the working current is collected, and the value of the working current at this time is used as the maximum value of the load current in the current working cycle; Step 6: Make U m (k) = k I I m (k) + C calculation to obtain the maximum value of the load voltage in this working cycle, where U m is the maximum value of the load voltage in the current working cycle, I m (k) is the maximum value of the load current in the current working cycle, k I and C are constants related to the dielectric barrier discharge load structure and gas characteristics, respectively.

2. A dielectric barrier discharge load peak voltage calculation device, characterized in that: include: A current acquisition unit, configured to acquire a load current signal at a current sampling moment and a current input signal at a previous moment adjacent to the current sampling moment; A current comparison unit, configured to perform a zero-crossing comparison on the working current input and to perform a zero-crossing comparison after taking the difference between the current at the current moment and the current at the previous moment; The current peak sampling moment forming unit performs a logic AND operation on the output signals of the two current comparison units, and the falling edge of the formed signal is the current peak sampling moment; A load voltage peak calculation unit is used to perform mathematical operations on the working current peak current of the dielectric barrier discharge load to obtain the dielectric barrier discharge load voltage peak value of the current cycle, and adopt the method described in claim 1 to calculate the load voltage peak value.

3. A dielectric barrier discharge load peak voltage calculation device, characterized in that: include: A memory for storing instructions, wherein the instructions include the steps of the method for calculating the dielectric barrier discharge load peak voltage according to claim 1; A processor is configured to execute the instructions.

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