阅读说明：本技术 一种低电压、低电磁干扰的纳秒脉冲-直流组合式介质阻挡放电产生装置及产生方法 (Low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generation device and method ) 是由 吴云 朱益飞 卞栋梁 宗豪华 张志波 宋慧敏 贾敏 于 2020-05-20 设计创作，主要内容包括：提供一种低电压、低电磁干扰的纳秒脉冲-直流组合式介质阻挡放电产生装置,包括：平板型正电极(5)、平板型负电极(9)、第一介质(15)、第二介质(16)、第一交流-直流转换器(3)、第二交流-直流转换器(7)、第一开关(2)、第二开关(6)、交流市电电源(1)、正弦高电压发生器(4)、微型纳秒脉冲低压信号发生器(8)和一根金属针(10)。金属针(10)的输入端接微型纳秒脉冲低压信号发生器(8)的输出端,金属针(10)的另一端悬空置于第一介质(15)与第二介质(16)之间接近正中间的任意位置。还提供一种相应的纳秒脉冲-直流组合式介质阻挡放电产生方法。本发明用于解决介质阻挡放电情况下,实现低电压、低功率条件下的纳秒脉冲放电。本发明能够解决电源重量大、成本高、电磁干扰严重的缺点。(The utility model provides a low voltage, low electromagnetic interference's nanosecond pulse-direct current combination formula dielectric barrier discharge produces device, includes: the device comprises a flat positive electrode (5), a flat negative electrode (9), a first medium (15), a second medium (16), a first alternating current-direct current converter (3), a second alternating current-direct current converter (7), a first switch (2), a second switch (6), an alternating current mains supply (1), a sine high-voltage generator (4), a micro nanosecond pulse low-voltage signal generator (8) and a metal needle (10). The input end of the metal needle (10) is connected with the output end of the micro nanosecond pulse low-voltage signal generator (8), and the other end of the metal needle (10) is suspended at any position between the first medium (15) and the second medium (16) and close to the middle of the first medium and the second medium. A corresponding nanosecond pulse-direct current combined dielectric barrier discharge generation method is also provided. The invention is used for realizing nanosecond pulse discharge under the conditions of low voltage and low power under the condition of dielectric barrier discharge. The invention can solve the defects of heavy weight, high cost and serious electromagnetic interference of the power supply.)

1. A low-voltage low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generating device is characterized by comprising: the device comprises a flat positive electrode (5), a flat negative electrode (9), a first medium (15), a second medium (16), a first alternating current-direct current converter (3), a second alternating current-direct current converter (7), a first switch (2), a second switch (6), an alternating current mains supply (1), a direct current high-voltage generator (4), a micro nanosecond pulse low-voltage signal generator (8) and a metal needle (10); wherein

The alternating current commercial power supply (1) is introduced into commercial power, and the negative end of the alternating current commercial power supply is grounded;

one end of the first switch (2) is connected with the output end of the alternating current commercial power supply (1);

the input end of the first alternating current-direct current converter (3) is connected with the other end of the first switch (2);

the input end of the direct-current high-voltage generator (4) is connected with the output end of the first alternating-current-direct-current converter (3);

the positive electrode (5) is connected with the output end of the direct-current high-voltage generator (4);

a rectangular block-shaped first medium (15), wherein a positive electrode (5) is attached to the left side surface of the first medium (15), and the positive electrode (5) covers the left side surface of the first medium (15);

the flat negative electrode (9) is grounded; a first medium (15) and a second medium (16) are arranged between the positive electrode (5) and the negative electrode (9) at intervals, and the positive electrode (5) and the negative electrode (9) are arranged back to back;

a rectangular block-shaped second medium (16) with a negative electrode (9) attached to the right side surface thereof, the negative electrode (9) covering the right side surface of the second medium (16);

one end of the second switch (6) is connected with the output end of the alternating current commercial power supply (1);

the input end of the second AC-DC converter (7) is connected with the other end of the second switch (6);

the input end of the micro nanosecond pulse low-voltage signal generator (8) is connected with the output end of the first alternating current-direct current converter (3);

the input end of the metal needle (10) is connected with the output end of the micro nanosecond pulse low-voltage signal generator (8), and the other end of the metal needle (10) is suspended between the first medium (15) and the second medium (16) and is close to the middle.

2. The method for generating low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge by using the device of claim 1 is characterized by comprising the following steps:

step 1: the alternating current commercial power supply (1) is connected, and the equipment is electrified;

step 2: closing the first switch (2), and rectifying an output signal of the alternating current commercial power supply (1) into a direct current voltage signal through a first alternating current-direct current converter (3);

step 3: the direct current voltage signal output by the first alternating current-direct current converter (3) enters a direct current high voltage generator (4) and then is boosted to high-voltage direct current;

step 4: the second switch (6) is closed, and the output signal of the alternating current commercial power supply (1) is rectified into a direct current voltage signal through a second alternating current-direct current converter (7);

step 5: a direct current voltage signal output by the second alternating current-direct current converter (7) enters a micro nanosecond pulse low-voltage signal generator (8) and then is rectified into a micro nanosecond pulse signal;

step 6: after a nanosecond pulse signal output by the micro nanosecond pulse low-voltage signal generator (8) reaches the metal needle (10), a strong local electric field is formed at the tip of the metal needle (10), and the local electric field and an original direct-current high-voltage electric field between media are superposed to reach a plasma ionization threshold value to initiate discharge;

step 7: the overall discharge intensity and frequency of the dielectric barrier discharge can be controlled by controlling the amplitude and frequency of the output voltage of the micro nanosecond pulse low-voltage signal generator (8).

Technical Field

The invention relates to the field of electrical physics, in particular to a low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generating device and a generating method.

Background

Nanosecond pulse discharge refers to pulse discharge caused by applying an ultrashort high-voltage pulse with a rising edge in a nanosecond time scale between two electrodes. Because the propagation time scale of nanosecond pulse discharge is equivalent to the voltage rise time scale, the discharge has high electric field intensity and is widely applied to ignition combustion supporting, gas purification and biomedicine.

An important application scenario of nanosecond pulse discharge is dielectric barrier discharge (dielectric barrier discharge), which is essentially a breakdown process of a gas between two insulating media under the action of nanosecond pulse voltage. In order to realize discharge in dielectric barrier discharge, a high electric field is required, and thus a nanosecond pulse power supply is required to generate a high-voltage pulse.

The common defects of the existing nanosecond pulse power supply are as follows: the main reasons for this are that in order to form a discharge, 220V ac mains needs to be boosted to a specific pulse high-voltage waveform, since the boosting stage number is very high, and in order to ensure the discharge power under a large load, heavy equipment such as a transformer and a magnetic compression ring needs to be integrated into the power supply, and the electromagnetic interference is severe. On the other hand, if the pulse waveform voltage is lowered, the gas cannot be broken down to form discharge, and the effect of nanosecond pulse discharge is difficult to be exhibited.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generating device, which comprises: the device comprises a flat positive electrode 5, a flat negative electrode 9, a first medium 15, a second medium 16, a first alternating current-direct current converter 3, a second alternating current-direct current converter 7, a first switch 2, a second switch 6, an alternating current mains supply 1, a direct current high-voltage generator 4, a micro nanosecond pulse low-voltage signal generator 8 and a metal needle 10; wherein

The AC commercial power supply 1 introduces commercial power, and the negative end thereof is grounded;

one end of the first switch 2 is connected with the output end of the alternating current commercial power supply 1;

the input end of the first AC-DC converter 3 is connected with the other end of the first switch 2;

the input end of the direct-current high-voltage generator 4 is connected with the output end of the first alternating-current-direct-current converter 3;

the positive electrode 5 is connected with the output end of the direct-current high-voltage generator 4;

a rectangular block-shaped first dielectric 15, the left side surface of which is attached with a positive electrode 5, the positive electrode 5 covering the left side surface of the first dielectric 15;

the flat negative electrode 9 is grounded; a first medium 15 and a second medium 16 are arranged between the positive electrode 5 and the negative electrode 9, and the positive electrode 5 and the negative electrode 9 are arranged back to back;

a rectangular block-shaped second medium 16 having a right side surface to which the negative electrode 9 is attached, the negative electrode 9 covering the right side surface of the second medium 16;

one end of the second switch 6 is connected with the output end of the alternating current commercial power supply 1;

the input end of the second AC-DC converter 7 is connected with the other end of the second switch 6;

the input end of the micro nanosecond pulse low-voltage signal generator 8 is connected with the output end of the first alternating current-direct current converter 3;

the input end of the metal needle 10 is connected with the output end of the micro nanosecond pulse low-voltage signal generator 8, and the other end of the metal needle 10 is suspended between the first medium 15 and the second medium 16 and is close to the middle.

In addition, the invention also provides a method for realizing low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generation by using the device of claim 1, which comprises the following steps:

step 1: the alternating current commercial power supply 1 is switched on, and the equipment is electrified;

step 2: the first switch 2 is closed, and the output signal of the alternating current commercial power supply 1 is rectified into a direct current voltage signal through the first alternating current-direct current converter 3;

step 3: the direct current voltage signal output by the first alternating current-direct current converter 3 is boosted to high-voltage direct current after entering the direct current high-voltage generator 4;

step 4: the second switch 6 is closed, and the output signal of the ac mains supply 1 is rectified into a dc voltage signal by the second ac-dc converter 7;

step 5: a direct current voltage signal output by the second alternating current-direct current converter 7 enters the micro nanosecond pulse low-voltage signal generator 8 and then is rectified into a micro nanosecond pulse signal;

step 6: after the nanosecond pulse signal output by the micro nanosecond pulse low-voltage signal generator 8 reaches the metal needle 10, a strong local electric field is formed at the tip of the metal needle 10, and the local electric field and an original direct-current high-voltage electric field between media are superposed to reach a plasma ionization threshold value to initiate discharge;

step 7: by controlling the amplitude and frequency of the output voltage of the micro nanosecond pulse low-voltage signal generator 8, the overall discharge intensity and frequency of the dielectric barrier discharge can be controlled.

The invention is used for realizing nanosecond pulse discharge under the conditions of low voltage and low power under the condition of dielectric barrier discharge. The invention can solve the defects of heavy weight, high cost and serious electromagnetic interference of the power supply.

Drawings

FIG. 1 is a schematic diagram showing the composition structure of a low-voltage and low-electromagnetic interference nanosecond pulse-DC combined dielectric barrier discharge generating device according to the invention;

fig. 2 shows a low-voltage and low-electromagnetic interference nanosecond pulse-dc combined dielectric barrier discharge generation method according to the present invention.

Detailed Description

The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.

The invention is realized by a low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generating device, as shown in figure 1, the device of the invention comprises: the device comprises a flat positive electrode 5, a flat negative electrode 9, a first medium 15, a second medium 16, a first alternating current-direct current converter 3, a second alternating current-direct current converter 7, a first switch 2, a second switch 6, an alternating current mains supply 1, a direct current high-voltage generator 4, a micro nanosecond pulse low-voltage signal generator 8 and a metal fine needle 10. The components are specifically described below.

The AC commercial power supply 1 introduces commercial power, and the negative end thereof is grounded;

one end of the first switch 2 is connected with the output end of the alternating current commercial power supply 1;

the input end of the first AC-DC converter 3 is connected with the other end of the first switch 2;

the input end of the direct-current high-voltage generator 4 is connected with the output end of the first alternating-current-direct-current converter 3;

the positive electrode 5 is connected with the output end of the direct-current high-voltage generator 4;

a rectangular block-shaped first dielectric 15, the left side surface of which is attached with a positive electrode 5, the positive electrode 5 can completely cover the left side surface of the first dielectric 15;

the flat negative electrode 9 is grounded; a first medium 15 and a second medium 16 are arranged between the positive electrode 5 and the negative electrode 9, and the positive electrode 5 and the negative electrode 9 are arranged back to back;

a rectangular block-shaped second medium 16, the right side surface of which is attached with the negative electrode 9, and the negative electrode 9 can completely cover the right side surface of the second medium 16;

one end of the second switch 6 is connected with the output end of the alternating current commercial power supply 1;

the input end of the second AC-DC converter 7 is connected with the other end of the second switch 6;

the input end of the micro nanosecond pulse low-voltage signal generator 8 is connected with the output end of the first alternating current-direct current converter 3;

the input end of the metal fine needle 10 is connected with the output end of the micro nanosecond pulse low-voltage signal generator 8, and the other end of the metal fine needle 10 is suspended between the first medium 15 and the second medium 16 (close to any position in the middle).

The invention relates to a low-voltage and low-electromagnetic interference nanosecond pulse-direct current combined dielectric barrier discharge generation method, which comprises the following implementation steps (as shown in figure 2):

step 1: the alternating current commercial power supply 1 is switched on, and the equipment is electrified;

step 2: the first switch 2 is closed, and the output signal of the alternating current commercial power supply 1 is rectified into a direct current voltage signal through the first alternating current-direct current converter 3;

step 3: the direct current voltage signal output by the first alternating current-direct current converter 3 is boosted to high-voltage direct current after entering the direct current high-voltage generator 4;

step 4: the second switch 6 is closed, and the output signal of the ac mains supply 1 is rectified into a dc voltage signal by the second ac-dc converter 7;

step 5: a direct current voltage signal output by the second alternating current-direct current converter 7 enters the micro nanosecond pulse low-voltage signal generator 8 and then is rectified into a micro nanosecond pulse signal;

step 6: after the nanosecond pulse signal output by the micro nanosecond pulse low-voltage signal generator 8 reaches the metal fine needle 10, a strong local electric field is formed at the tip of the metal fine needle 10, and the local electric field and an original direct-current high-voltage electric field between media are superposed to reach a plasma ionization threshold value to initiate discharge;

step 7: by controlling the amplitude and frequency of the output voltage of the micro nanosecond pulse low-voltage signal generator 8, the overall discharge intensity and frequency of the dielectric barrier discharge can be controlled.

The device of the invention has simple use method. The nanosecond pulse discharge with low voltage, low power and low electromagnetic interference can be generated in a direct current-nanosecond superposition mode only by controlling the simultaneous on-off of the two switches.

Compared with the existing high-voltage nanosecond-based pulse source, the invention has the following advantages:

1) the weight is extremely light. Because a large boosting device and a waveform compression device are not arranged, the total weight of the inverter, the high-voltage pack and the micro nanosecond pulse power supply is only 1kg and is less than 10% of that of the common high-voltage nanosecond pulse source;

2) the cost is extremely low. Because large capacitors and high-power switching devices do not need to be purchased, the element cost of the scheme is only 1-10% of that of a common high-voltage nanosecond pulse power supply;

3) the electromagnetic interference is weak. Because the voltage pulse amplitude that miniature nanosecond pulse module produced is very low power less, can not produce huge electromagnetic interference like traditional nanosecond pulse source, have practical value.