CN103055332A - Atmospheric dielectric barrier discharge plasma sterilization device - Google Patents
Atmospheric dielectric barrier discharge plasma sterilization device Download PDFInfo
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- CN103055332A CN103055332A CN2012105898021A CN201210589802A CN103055332A CN 103055332 A CN103055332 A CN 103055332A CN 2012105898021 A CN2012105898021 A CN 2012105898021A CN 201210589802 A CN201210589802 A CN 201210589802A CN 103055332 A CN103055332 A CN 103055332A
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- 230000001954 sterilising effect Effects 0.000 title claims abstract description 75
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 64
- 230000004888 barrier function Effects 0.000 title claims abstract description 31
- 238000004458 analytical method Methods 0.000 claims abstract description 18
- 230000015556 catabolic process Effects 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 12
- 229920006351 engineering plastic Polymers 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 4
- 239000007924 injection Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 103
- 238000000034 method Methods 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 9
- 239000007858 starting material Substances 0.000 claims description 9
- 230000007613 environmental effect Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 241000894006 Bacteria Species 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 4
- 230000003115 biocidal effect Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 230000005520 electrodynamics Effects 0.000 claims description 3
- 238000005468 ion implantation Methods 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052756 noble gas Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 206010042566 Superinfection Diseases 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Abstract
The invention provides an atmospheric dielectric barrier discharge plasma sterilization device. The device comprises sensors (a temperature sensor, an air pressure sensor and a wind power sensor), an analysis circuit, a power supply control circuit, a plasma generation device and the like. The device adopts the principles of dielectric barrier discharge, preionization and self-inductance, so that the needed power supply voltage can be effectively reduced, the device volume is decreased, and the actual use of the sterilization device is convenient. And above all, breakdown voltage is reduced to more easily ionize gas, that is, plasma is more easily generated under the atmospheric condition, so that the density of the plasma is increased, and the sterilization efficiency of the device is improved. As thin needle tubing is adopted, the jet speed of the plasma is quickened, and the sterilization range of the plasma sterilization device is improved. In addition, the appearance design is more humanized, so that more convenience is brought to the actual operation; and for materials, heat-resistant and insulative engineering plastics with antibacterial effect after the plasma injection treatment are adopted.
Description
Technical field:
The invention belongs to the plasma discharge technical field, be specifically related to method and the device relevant with the method for plasma dielectric barrier discharge sterilization under the atmospheric pressure.
Background technology:
Plasma sterilization is as a kind of low temperature sterilization method, and its characteristics have: (1) sterilising temp is low, can realize the direct sterilization to organism surface; (2) sterilization speed is fast, generally just can reach sterilization effect in tens seconds in dozens of minutes, is fit to very much emergent management; (3) no coupling product does not produce poisonous residue, to environment and operator safety; (4) sterilization can be carried out effective sterilizing to all angles of complex space, profile comprehensively.
Prior art such as Chinese patent 200880123007.5, utilization has the microwave energy of controlled unionized microwave radiation source and gas (mixture of noble gas or noble gas) combination, produces to be used for the low temperature plasma of sterilizing is waited on the biological tissue surface.Gas and microwave energy can be transferred to plasma generating region along integrated cable assembly.This integrated cable assembly provides the two-way airflow configuration, to allow gas from surface removal.
And for example Chinese patent 200810191718.8, the electrode that utilization is connected with radio frequency or high frequency electric source produces plasma micro-beam stream in insulation tube, be provided with air inlet connector, gas flow control valve switch and on and off switch, gas in the air supply source is when the gap of flowing through between the insulated dielectric tube internal and external electrode, breakdown ionization forms plasma and sprays outside housing, and the plasma line of this ejection can be used for the purpose to cleaning, sterilization and the sterilization on various surfaces.Chinese patent 201020111158.3 for another example, a kind of comb-shaped electrode atmosphere plasma device for sterilization is disclosed, include transparent cover, be provided with the upper and lower electrode of comb shape in the transparent cover, one side of draw-in groove is provided with blower fan, also is provided with airstrainer between blower fan and the draw-in groove, and electrode is connected with the both positive and negative polarity of external high voltage power supply respectively by wire, generation has chemically active particle, can carry out sterilization.
Above-mentioned various device all is short of aspect practicality, safety to some extent, need further improve: during (1) actual use, people wish that bactericidal unit can carry, so therefore supply voltage and volume be restricted, and need to reduce the discharge required voltage by technological means as far as possible.(2) actual sterilization situation is complicated and changeable, and bactericidal unit should be able to according to circumstances produce different electric fields or plasma flexibly, and this also just requires device should be able to control flexibly the occurrence scope of plasma, to improve sterilizing efficiency.(3) need to consider the impact that the environmental factors such as temperature, pressure and plasma density plasma sterilizing efficiency produce.(4) need to consider the safety issue of plasma sterilization device, avoid high pressure that device produces, radio frequency etc. to hurt operator.(5) said apparatus all needs external working gas or aerator, is unfavorable for using under the actual environment.
Summary of the invention:
The present invention is intended to propose a kind of novel plasma sterilization method and device, to improve prior art in the deficiency of the aspects such as practicality, safety, realizes efficient, safety sterilization, reduces device volume, reduces energy consumption and cost, tackles flexibly different situations.
The technical solution used in the present invention is: a kind of atmospheric dielectric barrier discharge plasma sterilization device, and this device comprises: shell and internal circuit; Internal circuit comprises sensor, analysis circuit, voltage control circuit and plasma producing apparatus; Sensor comprises temperature sensor, baroceptor and wind sensor; Sensor is surveyed and is comprised temperature, the environmental condition of air pressure and wind-force, then the data with environmental condition pass to analysis circuit, receive the analysis circuit of ambient parameter, these external environment parameters and pre-stored good parameter are compared, according to comparison result, the instruction template that has set is made corresponding change, the corresponding pre-stored good parameter of this instruction template, namely adjust the size of voltage parameter in the instruction, thereby form new instruction, and voltage control circuit sent instruction, voltage control circuit is regulated the voltage of inputting plasma producing apparatus after receiving instruction, be manual adjustment by external control circuit perhaps, regulated the voltage of plasma producing apparatus according to the judgement of oneself by operator, plasma producing apparatus adopts the method for RF preionization that gas is carried out preionization, in the air gap, form a certain amount of equally distributed initiating electron to reduce breakdown voltage, and then the mode that adopts dielectric barrier discharge is carried out discharge breakdown to the gas of preionization, fully ionization, form plasma, act on body surface, realize safety, cleaning, efficiently sterilization reaches simultaneously flexible control plasma device and produces suitable plasma to improve the purpose of sterilizing efficiency; After the plasma that produces is with killing bacteria, through manual adjustment stop plasma generation or through sensor survey and by the analysis circuit analyzing and processing after, send instruction and regulate plasma producing apparatus by voltage control circuit and stop to produce plasma flow.
Wherein, the engineering plastics (ABS) of described shell main material for processing through Plasma ion implantation, adopt cylindrical design, whole long 10-120cm, drum diameter 2-10cm, two places at a distance of 20cm in the middle of shell are provided with two handgrip parts 24, this handgrip part is the less 1-3cm of diameter for the cylinder body, but herein through thickening, and adopt frosted to process, can not only be better adiabatic, also increase simultaneously the friction between operator's hand and the device, apart from the 1cm place, the voltage knob is set at previous handgrip part, the voltage in the control inputs plasma generator; Apart from the 2cm place, circuit general switch is set at a rear handgrip part, control plasma generation with stop; Be respectively equipped with thereafter gas flowmeter, rare gas loads the position, is the RF preionization electrode of ring-type and the external electrode of plasma producing apparatus at the end of shell.
Wherein, described rare gas adopts argon.
Wherein, rare gas loads the position and adopts loop configuration, inner and outer diameter is respectively 2,3cm, and outer shroud is bossing, and inner circle is female, rare gas gas cylinder external diameter 79cm, the long 1525cm of bottle, rare gas gas cylinder outer shroud is female, rare gas gas cylinder inner circle is jut, this design can make plasma sterilization device and rare gas gas cylinder realize slitless connection, avoids gas leak.
Wherein, plasma producing apparatus comprises that interior electrode, the insulating barrier that is connected with the high-voltage output end positive pole, the external electrode that connects negative pole, cavity, cavity one side ports have the RF preionization electrode of ring-type, not conducting between external electrode and the RF preionization electrode, thickness is that the interior electrode that the Copper Foil of 2mm is made is connected with the positive pole of high-frequency step-up transformer, insulating medium layer is that the teflon plate of 1mm and densely covered aperture consists of by thickness, forms dielectric barrier discharge with the external electrode that is connected with power cathode; The rare gas source of the gas produces rare gas stream like this, behind control damper and gas flowmeter, operator utilize the control damper adjusting gas flow according to the shown gas flow value of gas flowmeter, form working gas in the rare gas stream entrained air; Such gas is after process preionization, realize fully ionization through dielectric barrier discharge again, form the plasma of higher density, air chamber wall and rare gas gas cylinder all adopt the engineering plastics (ABS) that injection is processed through plasma to make lightweight and antibiotic insulation.
Wherein, described external electrode has designed aperture plate, pectination type, the screw type of different-diameter in advance, according to reality sterilization situation, can choose flexibly suitable type, and diameter is large is fit to closely sterilization, and the plasma area of generation is large, and sterilization speed is fast; Although diameter little because the plasma area is less, and sterilization speed is poor than the former, and plasma density is larger, be applicable to the sterilization that the slit is located.
Wherein, plasma producing apparatus carries out preionization by radio-frequency electrode to gas, and utilize high-frequency step-up transformer moment to amplify dc source voltage, this high-frequency step-up transformer is the inductance coil of the electrodynamic capacity 10H-25H of ribbon core, the circuit of realizing this goal comprises: starter, switch, ballast, power supply, high-frequency step-up transformer, after the Closing Switch, voltage is through behind the high-frequency step-up transformer, and the place carries out preionization to gas at the RF preionization electrode, meanwhile, starter, ballast, the electric power generating composition closed-loop path, because resistance is very little in the circuit at this moment, so can form very large electric current in the circuit, the ballast two ends also will form very large voltage so, the Yin Wendu of starter place rises to a certain degree and disconnects, circuit moment disconnection, current break, this moment, ballast can be regarded power supply as, the voltage-drop loading at its two ends on interior electrode and external electrode, thereby make both end voltage reach breakdown voltage.
Principle of the present invention is:
Dielectric barrier discharge is the effective means that obtains nonequilibrium plasma under the atmospheric pressure.It can or be higher than under the atmospheric pressure at atmospheric pressure and produces the low temperature plasma that is rich in all kinds of active particles, in the environment or the antibacterial of organism and body surface kill.
The present invention adopts the dielectric barrier discharge (APDBD) under the atmospheric pressure, and the plasma density of its discharge generation is even, and have the evacuation of need not, power consumption little, utilize atmospherical discharges to need not the advantages such as external working gas.Because dielectric barrier discharge (DBD) can produce a large amount of free radical and quasi-molecule in the discharge process that produces; such as OH, O, NO etc.; their chemical property is very active; be easy to react with other atom, molecule or other free radical and form stable atom or molecule; this charging method is applied in the sterilization; energy Effective Raise sterilizing efficiency, thereby the practicality of raising device.
Structure of the present invention mainly comprises: sensor (temperature sensor, baroceptor, wind sensor), analysis circuit, power control circuit, plasma generator etc.The temperature that sensor detects, air pressure, the wind-force factor, data are passed to analysis circuit, this circuit is processed received environmental condition, analyze, and then power control circuit is sent instruction, after receiving instruction, power control circuit is regulated voltage and the frequency of high-frequency step-up transformer, or by judgement regulation voltage and the frequency of operator according to oneself, realize that the control plasma producing apparatus produces suitable plasma to improve the purpose of sterilizing efficiency flexibly, after the plasma that produces is with killing bacteria, can stops plasma generation or survey through sensor through manual adjustment, and after controlling power circuit after the analysis circuit analysis, stop.
Power control circuit is mainly finished DC voltage to the conversion of square-wave voltage by half-bridge inversion circuit.Under PWM (Pulse Width Modulation) control mode, two switching tube alternations are for high frequency transformer provides pulsewidth adjustable ac square-wave voltage.The high-frequency step-up transformer that the present invention utilizes series resonant converter to consist of, output high frequency sinusoidal voltage better mates high voltage power supply and dielectric barrier discharge load.
The present invention utilizes RF preionization, because preionization is stronger, required breakdown voltage is lower, so between two sparking electrodes, increase pre-ionization electrode, when sterilization, with pre-ionization electrode gas is carried out preionization first, in the air gap, make a certain amount of equally distributed initiating electron, can effectively reduce breakdown voltage.
The present invention utilizes self-inductance to reduce required supply voltage, its essence is by a high-frequency step-up transformer, amplifies the voltage that power supply provides, thereby realizes with lower input voltage, reaches higher breakdown voltage.
Described plasma producing apparatus mainly comprises: 1. the interior electrode that is connected with the high-voltage output end positive pole.2. insulating barrier.3. connect the external electrode of negative pole.In addition, can by changing different external electrode shapes, produce different plasma patterns, to tackle different situations.
Described plasma producing apparatus in shape, adopts the cylinder type design for improving its operability, and not only convenient operation personnel flexible operating can also be saved the storage area.Outside at device, designed handgrip part, in handgrip part front position slightly, switch has been installed and has been regulated button, the handled easily personnel regulate the frequency of plasma generator.
Because described plasma producing apparatus can be worked under various environment, for avoiding directly to contact the superinfection that causes with antibacterial, so the material of device should use anti-biotic material.In addition, owing to need hand-held device to operate, heat-resisting, insulation that material therefor needs is to ensure operator's safety.At last, under the prerequisite that described device requires, also should adopt as far as possible light material more than guaranteeing, so that operator sterilize flexibly, certainly also will consider the intensity of material.Comprehensive above the analysis, the present invention adopts through plasma and injects the engineering plastics of processing as main material.
Circuit is built in the shell that the material of above-mentioned condition makes, and avoids can't working because ambient temperature, humidity etc. causes circuit.
The present invention's advantage compared with prior art is:
The present invention adopts dielectric barrier discharge, preionization and self-inductance, not only can effectively reduce required supply voltage, reduces device volume, is convenient to the actual use of bactericidal unit.The more important thing is, by reducing breakdown voltage, make the easier ionization of gas, also be plasma easier generation under atmospheric condition, thereby increased the density of plasma, improve the sterilizing efficiency of this device.Adopt small needle tube, increased the speed of plasma jet, thereby improved the sterilization scope of plasma sterilization device.In addition, appearance design is more humane, more is conducive to practical operation; On the material, the engineering plastics with antibacterial effect that adopt heat-resisting, insulation and inject to process through plasma.
Description of drawings:
Fig. 1 is the overview flow chart of plasma sterilization device sterilization process of the present invention.
Fig. 2 is the schematic appearance of plasma sterilization device of the present invention.
Fig. 3 is plasma sterilization device internal structure sketch map of the present invention.
Fig. 4 is the power control circuit schematic diagram that plasma sterilization device of the present invention adopts.
Fig. 5 is that the rare gas (this example adopts argon) that plasma sterilization device of the present invention adopts loads the position sketch map, and the sketch map of rare gas container tank.
Fig. 6 is three kinds of dissimilar plasma producing apparatus design drawinies.
Fig. 7 is the control circuit schematic diagram.
Fig. 8 is the half-bridge circuit schematic diagram.
The specific embodiment:
As shown in Figure 1, the embodiment of the invention is comprised of shell and internal circuit; Internal circuit comprises sensor, analysis circuit, voltage control circuit and plasma producing apparatus; Sensor comprises temperature sensor, baroceptor and wind sensor; Sensor is surveyed and is comprised temperature, the environmental condition of air pressure and wind-force, then the data with environmental condition pass to analysis circuit, receive the analysis circuit of ambient parameter, these external environment parameters and pre-stored good parameter are compared, according to comparison result, the instruction template (the corresponding pre-stored good parameter of this instruction template) that has set is made corresponding change, namely adjust the size of voltage parameter in the instruction, thereby form new instruction, and voltage control circuit sent instruction, voltage control circuit is regulated the voltage of inputting plasma producing apparatus after receiving instruction, be manual adjustment by external control circuit perhaps, regulated the voltage of plasma producing apparatus according to the judgement of oneself by operator, plasma producing apparatus adopts the method for RF preionization that gas is carried out preionization, in the air gap, form a certain amount of equally distributed initiating electron to reduce breakdown voltage, and then the mode that adopts dielectric barrier discharge is carried out discharge breakdown to the gas of preionization, fully ionization, form plasma, act on body surface, realize safety, cleaning, efficiently sterilization reaches simultaneously flexible control plasma device and produces suitable plasma to improve the purpose of sterilizing efficiency; After the plasma that produces is with killing bacteria, through manual adjustment stop plasma generation or through sensor survey and by the analysis circuit analyzing and processing after, send instruction and regulate plasma producing apparatus by voltage control circuit and stop to produce plasma flow.
As shown in Figure 2, the engineering plastics (ABS) of plasma sterilization device shell 21 main materials of the present invention for processing through Plasma ion implantation, adopt cylindrical design, whole long 10-120cm, drum diameter 2-10cm, two places at a distance of 20cm in the middle of shell are provided with two handgrip parts 24, this handgrip part is the less 1-3cm of diameter for the cylinder body, but herein through thickening, and adopt frosted to process, can not only be better adiabatic, also increase the friction between operator's hand and the device simultaneously.Apart from the 1cm place, voltage knob 25 is set at previous handgrip part, the voltage in the control inputs plasma generator; Apart from the 2cm place, circuit general switch 23 is set at a rear handgrip part, control plasma generation with stop; Be respectively equipped with thereafter gas flowmeter 28, rare gas (embodiment of the invention employing argon) loads position 22, is the RF preionization electrode 26 of ring-type and the external electrode 27 of plasma producing apparatus at the end of shell.
As shown in Figure 5, rare gas loads position 22 and adopts loop configuration, inner and outer diameter is respectively 2,3cm, and outer shroud 53 is bossing, and inner circle 52 is female, rare gas gas cylinder 54 external diameters 7-9cm, long 15-the 25cm of bottle, rare gas gas cylinder 54 outer shrouds 55 are female, rare gas gas cylinder 54 inner circles 56 are jut, this design can make plasma sterilization device and rare gas gas cylinder 54 realize slitless connection, avoids gas leak.Need to prove that rare gas such as argon have been the auxiliary effects that reduces breakdown voltage, rare gas gas cylinder 54 can be dismantled flexibly, need not load onto when not required, avoids affecting operator's sterilization.
As shown in Figure 3, the core of plasma sterilization device of the present invention is plasma producing apparatus, and plasma producing apparatus comprises that interior electrode 35, the insulating barrier 34 that is connected with the high-voltage output end positive pole, the external electrode 27 that connects negative pole, cavity 31, cavity one side ports have the RF preionization electrode 26 of ring-type.Not conducting between external electrode 27 and the RF preionization electrode 26.
Thickness is that the interior electrode 35 that the Copper Foil of 2mm is made is connected with the positive pole of high-frequency step-up transformer 47, and insulating medium layer 34 is that the teflon plate of 1mm and densely covered aperture consists of by thickness, forms dielectric barrier discharges with the external electrode 27 that is connected with power cathode; Rare gas source of the gas 32 produces rare gas such as argon gas stream like this, behind control damper 33 and gas flowmeter 28, operator utilize control damper 33 adjusting gas flows according to gas flowmeter 28 shown gas flow values, form working gas in the argon gas stream entrained air; Such gas is realized fully ionization through dielectric barrier discharge again through after the preionization, forms the plasma of higher density.Air chamber wall and rare gas gas cylinder all adopt the engineering plastics (ABS) that injection is processed through plasma to make lightweight and antibiotic insulation.
As shown in Figure 6, for external electrode 27, designed in advance aperture plate, pectination type, the screw type of different-diameter.According to reality sterilization situation, can choose flexibly suitable type.The suitable closely sterilization that diameter is large, the plasma area of generation is large, and sterilization speed is fast; Although diameter little because the plasma area is less, and sterilization speed is poor than the former, and plasma density is larger, be applicable to the sterilization that the slit is located.
As shown in Figure 4, this plasma producing apparatus carries out preionization by 26 pairs of gases of radio-frequency electrode, and utilizes the inductance coil of the electrodynamic capacity 10H-25H of high-frequency step-up transformer 47(ribbon core) moment amplification dc source voltage.The circuit of realizing this goal comprises: starter 41, switch 43, ballast 44, power supply 45, high-frequency step-up transformer 47.After the Closing Switch 43, voltage is through behind the high-frequency step-up transformer 47,26 places carry out preionization to gas at the RF preionization electrode, meanwhile, starter 41, ballast 44, power supply 45 consist of the closed-loop path, because resistance is very little in the circuit at this moment, so can form very large electric current in the circuit, ballast 44 two ends also will form very large voltage so.Starter 41 Yin Wendu of place rise to a certain degree and disconnect, and circuit moment disconnects, current break, this moment, ballast 44 can be regarded power supply as, the voltage-drop loading at its two ends on interior electrode 35 and external electrode 27, thereby make both end voltage reach breakdown voltage.
The principle of control circuit 42 as shown in Figure 7.Half-bridge PWM controller adopts the TL598 of TI company, and its output stage adopts push-pull circuit, and switching frequency can reach 300kHz.The control signal of PWM controller output must just can be used for driving IGBT(Insulated Gate Bipolar Transistor after overpower is put and isolated greatly).The power drive chip is selected IXDD404.Such pwm control signal is through overdriving, isolating, realized the isolation between control circuit and the main circuit, simultaneously weak control signal is converted to the driving signal that possesses certain power, this driving signal has negative pressure (negative pulse) to the half-bridge switch pipe, can directly drive half-bridge IGBT and guarantee its reliable turn-off.
The schematic diagram of half-bridge main circuit 48 as shown in Figure 8, under the control that drives signal, half-bridge is arm switch pipe Q1 and Q2 alternate conduction up and down, and forms series resonant circuit, output AC sinusoidal voltage with the elementary leakage inductance of high-tension transformer.
The content that is not described in detail in the description of the present invention belongs to the known prior art of this area professional and technical personnel.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. an atmospheric dielectric barrier discharge plasma sterilization device is characterized in that, this device comprises: shell (21) and internal circuit; Internal circuit comprises sensor, analysis circuit, voltage control circuit and plasma producing apparatus; Sensor comprises temperature sensor, baroceptor and wind sensor; Sensor is surveyed and is comprised temperature, the environmental condition of air pressure and wind-force, then the data with environmental condition pass to analysis circuit, receive the analysis circuit of ambient parameter, these external environment parameters and pre-stored good parameter are compared, according to comparison result, the instruction template that has set is made corresponding change, the corresponding pre-stored good parameter of this instruction template, namely adjust the size of voltage parameter in the instruction, thereby form new instruction, and voltage control circuit sent instruction, voltage control circuit is regulated the voltage of inputting plasma producing apparatus after receiving instruction, be manual adjustment by external control circuit perhaps, regulated the voltage of plasma producing apparatus according to the judgement of oneself by operator, plasma producing apparatus adopts the method for RF preionization that gas is carried out preionization, in the air gap, form a certain amount of equally distributed initiating electron to reduce breakdown voltage, and then the mode that adopts dielectric barrier discharge is carried out discharge breakdown to the gas of preionization, fully ionization, form plasma, act on body surface, realize safety, cleaning, efficiently sterilization reaches simultaneously flexible control plasma device and produces suitable plasma to improve the purpose of sterilizing efficiency; After the plasma that produces is with killing bacteria, through manual adjustment stop plasma generation or through sensor survey and by the analysis circuit analyzing and processing after, send instruction and regulate plasma producing apparatus by voltage control circuit and stop to produce plasma flow.
2. a kind of atmospheric dielectric barrier discharge plasma sterilization device according to claim 1, it is characterized in that, the engineering plastics (ABS) of described shell (21) main material for processing through Plasma ion implantation, adopt cylindrical design, whole long 10-120cm, drum diameter 2-10cm, two places at a distance of 20cm in the middle of shell are provided with two handgrip parts 24, this handgrip part is the less 1-3cm of diameter for the cylinder body, but herein through thickening, and adopt frosted to process, can not only be better adiabatic, the friction between also increasing operator's hand simultaneously and installing, at previous handgrip part apart from the 1cm place, voltage knob (25) is set, the voltage in the control inputs plasma generator; Apart from the 2cm place, circuit general switch (23) is set at a rear handgrip part, control plasma generation with stop; Be respectively equipped with thereafter gas flowmeter (28), rare gas loads position (22), is the RF preionization electrode (26) of ring-type and the external electrode (27) of plasma producing apparatus at the end of shell.
3. a kind of atmospheric dielectric barrier discharge plasma sterilization device according to claim 2 is characterized in that, described rare gas adopts argon.
4. a kind of atmospheric dielectric barrier discharge plasma sterilization device according to claim 2, it is characterized in that, rare gas loads position (22) and adopts loop configuration, inner and outer diameter is respectively 2,3cm, outer shroud (53) is bossing, inner circle (52) is female, rare gas gas cylinder (54) external diameter 79cm, the long 1525cm of bottle, rare gas gas cylinder (54) outer shroud (55) is female, rare gas gas cylinder (54) inner circle (56) is jut, and this design can make plasma sterilization device and rare gas gas cylinder (54) realize slitless connection, avoids gas leak.
5. a kind of atmospheric dielectric barrier discharge plasma sterilization device according to claim 1, it is characterized in that, plasma producing apparatus comprises the interior electrode (35) that is connected with the high-voltage output end positive pole, insulating barrier (34), connect the external electrode (27) of negative pole, cavity (31), cavity one side ports has the RF preionization electrode (26) of ring-type, not conducting between external electrode (27) and the RF preionization electrode (26), thickness is that the interior electrode (35) that the Copper Foil of 2mm is made is connected with the positive pole of high-frequency step-up transformer (47), insulating medium layer (34) is that the teflon plate of 1mm and densely covered aperture consists of by thickness, forms dielectric barrier discharge with the external electrode that is connected with power cathode (27); Rare gas source of the gas (32) produces rare gas stream like this, behind control damper (33) and gas flowmeter (28), operator utilize control damper (33) adjusting gas flow according to the shown gas flow value of gas flowmeter (28), form working gas in the rare gas stream entrained air; Such gas is after process preionization, realize fully ionization through dielectric barrier discharge again, form the plasma of higher density, air chamber wall and rare gas gas cylinder all adopt the engineering plastics (ABS) that injection is processed through plasma to make lightweight and antibiotic insulation.
6. a kind of atmospheric dielectric barrier discharge plasma sterilization device according to claim 5, it is characterized in that, described external electrode (27), aperture plate, pectination type, the screw type of different-diameter have been designed in advance, according to reality sterilization situation, can choose flexibly suitable type, the suitable closely sterilization that diameter is large, the plasma area that produces is large, and sterilization speed is fast; Although diameter little because the plasma area is less, and sterilization speed is poor than the former, and plasma density is larger, be applicable to the sterilization that the slit is located.
7. a kind of atmospheric dielectric barrier discharge plasma sterilization device according to claim 5, it is characterized in that, plasma producing apparatus carries out preionization by radio-frequency electrode (26) to gas, and utilize high-frequency step-up transformer (47) moment to amplify dc source voltage, this high-frequency step-up transformer (47) is the inductance coil of the electrodynamic capacity 10H-25H of ribbon core, the circuit of realizing this goal comprises: starter (41), switch (43), ballast (44), power supply (45), high-frequency step-up transformer (47), after the Closing Switch (43), behind the voltage process high-frequency step-up transformer (47), locate gas is carried out preionization at RF preionization electrode (26), meanwhile, starter (41), ballast (44), power supply (45) consists of the closed-loop path, because resistance is very little in the circuit at this moment, so can form very large electric current in the circuit, ballast (44) two ends also will form very large voltage so, starter (41) is located Yin Wendu and is risen to a certain degree and disconnect, circuit moment disconnection, current break, ballast this moment (44) can be regarded power supply as, the voltage-drop loading at its two ends arrives on interior electrode (35) and the external electrode (27), thereby makes both end voltage reach breakdown voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210589802.1A CN103055332B (en) | 2012-12-31 | 2012-12-31 | Atmospheric dielectric barrier discharge plasma sterilization device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104225638A (en) * | 2014-08-14 | 2014-12-24 | 西安交通大学 | Plasma atomized sterilization device with temperature of lower than 80 DEG C |
| CN105515343A (en) * | 2016-01-22 | 2016-04-20 | 中科新天地（合肥）环保科技有限公司 | Low-temperature plasma discharge power supply device |
| CN107837656A (en) * | 2016-09-20 | 2018-03-27 | 南京克普医疗科技有限公司 | A kind of normal temperature atmospheric pressure plasma equipment for air purge |
| CN112004304A (en) * | 2020-08-13 | 2020-11-27 | 中国科学院合肥物质科学研究院 | Corona composite dielectric barrier discharge plasma jet generating device |
| CN113141699A (en) * | 2020-01-17 | 2021-07-20 | 飞秒科技有限公司 | Plasma device with replaceable handpiece |
| CN115161166A (en) * | 2022-07-27 | 2022-10-11 | 安徽大学 | Experimental device for low temperature plasma inactivation microorganism |
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| GB2411358A (en) * | 2004-02-25 | 2005-08-31 | Jonathan Hugh Lambert Copus | Current and voltage control for electronic microbicidal devices |
| CN1961967A (en) * | 2005-11-11 | 2007-05-16 | Lg电子株式会社 | Sterilizer and method for controlling the same |
| KR20110030827A (en) * | 2009-09-18 | 2011-03-24 | 을지대학교 산학협력단 | Portable sterilization and treatment device for localized region |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104225638A (en) * | 2014-08-14 | 2014-12-24 | 西安交通大学 | Plasma atomized sterilization device with temperature of lower than 80 DEG C |
| CN105515343A (en) * | 2016-01-22 | 2016-04-20 | 中科新天地（合肥）环保科技有限公司 | Low-temperature plasma discharge power supply device |
| CN107837656A (en) * | 2016-09-20 | 2018-03-27 | 南京克普医疗科技有限公司 | A kind of normal temperature atmospheric pressure plasma equipment for air purge |
| CN113141699A (en) * | 2020-01-17 | 2021-07-20 | 飞秒科技有限公司 | Plasma device with replaceable handpiece |
| CN112004304A (en) * | 2020-08-13 | 2020-11-27 | 中国科学院合肥物质科学研究院 | Corona composite dielectric barrier discharge plasma jet generating device |
| CN115161166A (en) * | 2022-07-27 | 2022-10-11 | 安徽大学 | Experimental device for low temperature plasma inactivation microorganism |
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