CN110962549A - Vehicle-mounted air purification and anion generator - Google Patents
Vehicle-mounted air purification and anion generator Download PDFInfo
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- CN110962549A CN110962549A CN201911420829.6A CN201911420829A CN110962549A CN 110962549 A CN110962549 A CN 110962549A CN 201911420829 A CN201911420829 A CN 201911420829A CN 110962549 A CN110962549 A CN 110962549A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/0007—Adding substances other than water to the air, e.g. perfume, oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
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- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60H3/0035—Adding substances other than water to the air, e.g. perfume, oxygen characterised by the control methods for adding the substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
本发明公开了一种车载空气净化与负离子发生器，所述净化器包括壳体、高效过滤网、放电协同光催化净化单元、风机、催化单元、气体检测单元、控制单元、超声雾化单元和电源系统；作为优选方案，还包括负离子发生单元。本发明提供了一种车载空气净化与负离子发生器，这种净化器可以有效净化去除车内空气环境中的甲醛、苯系物、可吸入颗粒物、挥发性有机物、细菌、病毒等有害物质，这种净化器结构简单，操作方便，净化效果良好。
The invention discloses a vehicle-mounted air purification and negative ion generator. The purifier comprises a casing, a high-efficiency filter, a discharge coordinated photocatalytic purification unit, a fan, a catalytic unit, a gas detection unit, a control unit, an ultrasonic atomization unit and a A power supply system; as a preferred solution, a negative ion generating unit is also included. The invention provides a vehicle air purification and negative ion generator. The purifier can effectively purify and remove harmful substances such as formaldehyde, benzene series, inhalable particulate matter, volatile organic compounds, bacteria, viruses and the like in the air environment of the vehicle. The purifier has the advantages of simple structure, convenient operation and good purification effect.
Description
Technical Field
The invention relates to a vehicle-mounted air purification and anion generator, and belongs to the technical field of vehicle products.
Background
With the improvement of technology and the quality of life of people, the number of domestic automobiles is continuously increased at present, while more and more automobile interior decorations and automobile leather articles appear, the content of harmful substances in the air in the automobiles is also continuously improved, according to investigation, 33 formaldehyde in 93 new automobiles exceeds the standard, and in 200 used automobiles, the content of TVOC harmful gas in 90 percent of the automobiles exceeds the standard seriously, and the harmful gas has serious carcinogenesis and other serious disease inducing harm to human bodies.
Nevertheless, the interior air circumstance problem also can not obtain effectual improvement always, and the technique that current air purification device adopted mainly divide into two kinds at present, and one kind is the filtration adsorption-type, mainly uses dust and granule harmful substance in the high-efficient filter screen separation environment, but does not have too big effect to bacterium and toxic gas, filters the adsorption method moreover and has the saturation problem, need regularly change the filter screen, and the consumptive material is not environmental protection. And a large amount of dust particles and viruses are attached to the filter screen after a period of use, so that the filtering efficiency is reduced, the problem that the filter screen becomes a pollution source due to bacterial reproduction exists, the development prospect of the mode is restricted, and the novel air purification technologies such as photocatalysis and plasma are provided, so that the advantages of high-efficiency removal efficiency are taken out of consideration, but the defects are also caused. For example: the photocatalysis technology is that under the condition of ultraviolet irradiation, the catalyst decomposes harmful substances through catalytic action, the sterilization effect is good, but the purification efficiency is too low, the capability is limited, and the purification function of the device is difficult to support independently. The plasma technology is used as a hot door technology for treating air pollution, has the characteristics of low cost, low consumption and high efficiency, but also has the problem of secondary pollution caused by harmful byproducts. Therefore, the standard of air purification is not only to remove the harmful substances originally existing in the air, but also to pay attention to the treatment of the harmful substances generated during the reaction process.
Disclosure of Invention
Therefore, the research and development of the vehicle air purifier with high efficiency, low energy consumption and no pollution has great significance on environmental protection and human body safety, and the invention provides the vehicle air purification and negative ion generator in order to solve the problems in the prior art. The air purifier adopts a discharge combined catalyst, and can effectively purify and remove formaldehyde, benzene series, inhalable particles, volatile organic compounds, bacteria, viruses and other harmful substances in the air environment in the vehicle. The negative ion generator is composed of an ultrasonic atomization unit and a negative ion generation unit, generates enough electrons, mixes the electrons with air behind the front-end air purifier and water mist after ultrasonic atomization and then sends out the mixed electrons, and provides enough negative ions beneficial to a human body for the space in the vehicle. The purifier has simple structure, convenient operation and good purifying effect.
The technical scheme of the invention is as follows:
a vehicle-mounted air purification and anion generator comprises a shell, a high-efficiency filter screen, a discharge cooperation photocatalytic purification unit, a fan, a catalysis unit, a gas detection unit, a control unit, an ultrasonic atomization unit and a power supply system;
the side wall of the shell is provided with a plurality of through holes as air inlets, air enters the shell to form an air inlet area, and the air inlet area is sequentially provided with a cylindrical high-efficiency filter screen and a discharge synergistic photocatalytic purification unit from outside to inside;
the discharge cooperation photocatalytic purification unit is formed by sleeving three layers of insulating pipes along the same axis, uniform conducting layers are arranged outside the outer insulating pipe, on two sides of the middle insulating pipe and on the inner side of the inner insulating pipe, and the conducting layer on the surface of the middle insulating pipe, the conducting layer on the surface of the outer insulating pipe and the conducting layer on the surface of the inner insulating pipe are respectively and correspondingly connected with a high-voltage power supply processed by the power supply system and grounded; filling photocatalyst alumina taking ultraviolet light generated by dielectric barrier discharge as an energy source in two interlayers in the three layers of insulating tubes to form an air purification unit with discharge and photocatalysis cooperated;
the fan is arranged at the bottom of the inner side of the inner-layer insulating pipe, the catalytic unit is filled with a catalyst and sleeved on the inner side of the inner-layer insulating pipe along the same axis of the discharge-cooperated photocatalytic purification unit, the upper side of the catalytic unit is connected with a gas outlet arranged at the top of the shell, the gas detection unit and the ultrasonic atomization unit are arranged beside the gas outlet, and the power supply system is respectively connected to the discharge-cooperated photocatalytic purification unit, the gas detection unit, the control unit, the ultrasonic atomization unit and the fan through processing modules of different circuits; the control unit is connected to the gas detection unit, and the working states of different units are controlled through the PWM driving module according to signals of the gas detection unit.
The efficient filter screen is sequentially provided with an active carbon filter screen, an HEPA filter screen and primary filter cotton from inside to outside.
The catalytic unit can be automatically detached and replaced.
The catalyst in the catalytic unit is spherical manganese dioxide loaded with palladium.
The ultrasonic atomization unit comprises an ultrasonic atomizer and a water storage tank, the ultrasonic atomizer sprays water in the water storage tank out from a nozzle after atomizing the water, and the water mist is mixed with air purified by the discharge and photocatalytic purification unit and then is discharged.
The power supply system is a 12V storage battery, and the processing module of the power supply system comprises a BOOST circuit 1, an inverter BOOST circuit, a BOOST circuit 2, a BOOST voltage stabilizing circuit, a signal generating and controlling circuit, a PWM driving module 1, a PWM driving module 2 and a PWM driving module 3;
the power supply is divided into two branches and respectively supplies power to the discharge cooperation photocatalytic purification unit, the signal generation and control circuit, the ultrasonic atomization unit and the fan;
the first multistage boosting branch circuit sequentially BOOSTs the voltage to V through the BOOST circuit 11Then inverted into alternating current by an inverting booster circuit and the voltage is raised to V2The BOOST circuit 2 BOOSTs the voltage to VH2 to supply power for the discharge and the photocatalytic purification unit;
the second branch circuit raises the voltage to V through the BOOST voltage stabilizing circuit4The power supply is supplied for the signal generation and control circuit, the inverter booster circuit is driven by the PWM driving module 1, the ultrasonic atomization unit is driven by the PWM driving module 2, and the fan is driven by the PWM driving module 3.
As another optimization scheme, on the basis of the technical scheme, the purifier is additionally provided with a negative ion generating unit, the negative ion generating unit is arranged beside the air outlet and positioned above the ultrasonic atomizer, and air purified by the water mist and the discharge cooperative photocatalytic purification unit is mixed with negative ions generated by the negative ion generating unit and then discharged out of the purifier.
The negative ion generating unit is a negative corona discharge reactor and comprises a metal wire electrode, a metal cylinder electrode, an insulating shell, a sealed front end cover and a sealed rear end cover; the metal wire electrode is arranged in the metal cylinder electrode, the metal wire electrode is fixed by the front sealing end cover and the rear sealing end cover, the front sealing end cover is provided with an air inlet, the rear sealing end cover is provided with an air outlet, and the metal cylinder electrode is fixed by the insulating shell, the front sealing end cover and the rear sealing end cover.
The metal wire electrode is made of tungsten, indium or stainless steel.
The processing module of the power supply system also comprises a voltage doubling rectifying circuit and a PWM driving module 4 on the basis of the technical scheme of the non-negative ion generating unit;
the power supply is divided into two branches and respectively supplies power to the discharge cooperation photocatalytic purification unit, the signal generation and control circuit, the fan and the ultrasonic atomization unit;
the first multistage boosting branch circuit sequentially BOOSTs the voltage to V through the BOOST circuit 11Then inverted into AC current by the inverting booster circuitAnd increasing the voltage to V2The BOOST booster circuit 2 BOOSTs the voltage to VH2 to supply power for the discharge-cooperated photocatalytic purification unit, and the AC current is boosted to V voltage by the voltage doubling rectifying circuit3The voltage doubling rectifying circuit supplies power to the negative ion generating unit;
the second branch circuit raises the voltage to V through the BOOST voltage stabilizing circuit4The power supply circuit supplies power for the signal generation and control circuit, then drives the inversion booster circuit through the PWM driving module 1, drives the ultrasonic atomization unit through the PWM driving module 2, drives the fan through the PWM driving module 3, and drives the voltage doubling rectification circuit through the PWM driving module 4.
The invention achieves the following beneficial effects:
the plasma discharge area is loaded with the photocatalyst to jointly treat volatile organic compounds in the air, and the effect and the efficiency are obviously improved. In the contrast patent CN107174879A "a plasma air purifier", the other side's device just decomposes harmful substance through corona discharge plasma reactor, and efficiency is lower, and this device carries on the volatile organic compounds in photocatalyst combined treatment air in the plasma discharge region, and effect, efficiency are showing and are improving. In a comparison patent CN207140742U, "a vehicle-mounted plasma air purifier", the ultraviolet light of the photocatalyst excited by the opposite device is from the built-in ultraviolet lamp, and the ultraviolet light of the photocatalyst excited by the device is from the byproduct ultraviolet light generated in the dielectric barrier discharge process, so that the utilization rate of the product and the efficiency of removing harmful substances are improved, and the plasma air purifier is more energy-saving and environment-friendly. In the comparison patent CN106512719A, "the stacked tubular air purification device compounded by plasma, photocatalyst and nitrogen oxide absorbent", the gas flow direction of the other device is unidirectional, the whole structure of the device occupies a large space and is not suitable for the complex in-vehicle environment, and the gas flow direction route of the device has a simple requirement on the volume of the device, and the whole structure utilizes the space more reasonably.
Drawings
FIG. 1 is a block diagram of a system according to a first embodiment;
FIG. 2 is a schematic structural diagram according to the first embodiment;
FIG. 3 is a power supply processing module according to the first embodiment;
FIG. 4 is a system block diagram of the second embodiment;
FIG. 5 is a schematic structural view of the second embodiment;
FIG. 6 is a schematic view of an anion generating unit in the second embodiment;
FIG. 7 is a power supply processing block of the second embodiment;
FIG. 8 is a circuit diagram of an inverting BOOST circuit and a BOOST BOOST circuit;
FIG. 9 is a PWM generation circuit;
FIG. 10 is a PDM power density modulation scheme;
FIG. 11 is a schematic circuit diagram of a gear shift;
fig. 12 is a negative corona discharge voltage doubler rectifier circuit.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1 and 2, the purifier comprises a shell 1, an efficient filter screen 3, a discharge cooperation photocatalytic purification unit, a fan 12, a catalytic unit 10, a gas detection unit 9, a control unit 8, an ultrasonic atomization unit 13 and a power supply system 6;
the side wall of the shell is provided with a plurality of through holes as air inlets 2, air enters the shell 1 to form an air inlet area, and the air inlet area is sequentially provided with a cylindrical high-efficiency filter screen 3 and a discharge synergistic photocatalytic purification unit from outside to inside;
the discharge cooperation photocatalytic purification unit is formed by sleeving three layers of insulating tubes 4 along the same axis, uniform conducting layers are arranged outside the outer insulating tube, on two sides of the middle insulating tube and on the inner side of the inner insulating tube, and the conducting layer on the surface of the middle insulating tube, the conducting layer on the surface of the outer insulating tube and the conducting layer on the surfaces of the inner insulating tube are respectively and correspondingly connected with a high-voltage power supply processed by a power supply system and grounded; filling photocatalyst alumina 5 taking ultraviolet light generated by dielectric barrier discharge as an energy source in two interlayers in the three layers of insulating tubes to form an air purification unit with discharge and photocatalysis in coordination;
the fan 12 is arranged at the bottom of the inner side of the inner-layer insulating tube, the catalytic unit is filled with a catalyst, the catalytic unit is sleeved on the inner side of the inner-layer insulating tube along the same axis of the discharge-synergetic photocatalytic purification unit, the upper side of the catalytic unit is connected with the gas outlet 7 arranged at the top of the shell, the gas detection unit 9 and the ultrasonic atomization unit 13 are arranged beside the gas outlet 7, and the power supply system 6 is respectively connected to the discharge-synergetic photocatalytic purification unit, the gas detection unit 9, the control unit 8, the ultrasonic atomization unit 13 and the fan 12 through processing modules of different circuits; the control unit 8 is connected to the gas detection unit 9, and controls the working states of different units through the PWM driving module according to the signal of the gas detection unit.
The efficient filter screen is sequentially provided with an active carbon filter screen, an HEPA filter screen and primary filter cotton from inside to outside.
The catalytic unit can be automatically detached and replaced.
The ultrasonic atomization unit 13 comprises an ultrasonic atomizer and a water storage tank, the ultrasonic atomizer atomizes water in the water storage tank and then sprays out from a nozzle, and the water mist is mixed with air purified by the discharge and photocatalytic purification unit and then is discharged
The catalyst in the catalytic unit is spherical manganese dioxide loaded with palladium.
The manganese dioxide supported palladium has the advantages of high catalytic efficiency, simple and harmless catalytic product and the like, meanwhile, the manganese dioxide supported palladium also has a certain removing effect on TVOC gas, and the catalytic unit can play a role in secondary purification and removal of harmful byproducts in the device.
There are a wide variety of catalysts currently used for removing nitrogen oxides and ozone. Such as titanium dioxide, bismuth oxyhalide, and the like. However, titanium dioxide has a large forbidden band width and low photocatalytic quantum efficiency, and nitrogen oxides cannot be efficiently removed. The product obtained by removing nitrogen oxides by bismuth oxyhalide catalysis has poor selectivity and low catalytic efficiency, and a plurality of byproducts are generated.
Under the conditions of temperature and humidity of the working environment of the catalytic unit of the device, compared with three types of solid catalysts, namely molecular sieves, activated carbon and partial metal oxides, the catalytic activity of the metal oxides is highest; and according to the research, the manganese oxide has the highest catalytic activity among a plurality of metal oxides having catalytic effects. In order to further improve the catalytic activity, the invention selects noble metal palladium with high-efficiency catalytic activity as an auxiliary material, and the palladium is attached to the surface of manganese dioxide in a single atom form, so that the composite catalyst has higher catalytic activity.
Considering that the catalyst with larger surface area has higher oxygen vacancy density on the surface, the active sites are more, and the catalytic activity is higher, the invention preferably selects the catalyst with three shapes of rod, sphere and powder, and carries out a plurality of experimental analyses, and the result is shown in table 1, and the catalytic effect of the spherical catalyst is optimal.
| Efficiency of | Circulation of gas | |
| Rod-like | About 78 percent | Is unblocked |
| Spherical shape | About 97 percent | Is unblocked |
| In the form of a powder | 99％ | Is difficult to pass through |
TABLE 1 catalyst shape Effect
As shown in fig. 3, the power supply system is a 12V battery, and the processing module includes a BOOST circuit 1, an inverter BOOST circuit, a BOOST circuit 2, a BOOST voltage regulator circuit, a signal generating and controlling circuit, a PWM driving module 1, a PWM driving module 2, and a PWM driving module 3;
the power supply is divided into two branches and respectively supplies power to the discharge cooperation photocatalytic purification unit, the signal generation and control circuit and the fan;
the first multistage boosting branch circuit sequentially BOOSTs the voltage to V through the BOOST circuit 11，V1About 50V, and then inverted into AC current by the inverter boosting circuit and the voltage is raised to V2，V2About 600V, the BOOST booster circuit 2 BOOSTs the voltage to VH2, and VH2 is about 200V and supplies power for the discharge and the photocatalytic purification unit;
the second branch circuit raises the voltage to V through the BOOST voltage stabilizing circuit4Generally 15V, supplies power for the signal generation and control circuit, drives the inverter booster circuit through the PWM driving module 1, drives the ultrasonic atomization unit through the PWM driving module 2, and drives the fan through the PWM driving module 3.
Example two:
a vehicle-mounted air purification and anion generator comprises a shell 1, a high-efficiency filter screen 3, a discharge cooperation photocatalysis purification unit, a fan 12, a catalysis unit 10, a gas detection unit 9, an ultrasonic atomization unit 13, an anion generation unit 14, a control unit 8 and a power supply system 6;
the side wall of the shell is provided with a plurality of through holes as air inlets 2, air enters the shell 1 to form an air inlet area, and the air inlet area is sequentially provided with a cylindrical high-efficiency filter screen 3 and a discharge synergistic photocatalytic purification unit from outside to inside;
the discharge cooperation photocatalytic purification unit is formed by sleeving three layers of insulating tubes 4 along the same axis, uniform conducting layers are arranged outside the outer insulating tube, on two sides of the middle insulating tube and on the inner side of the inner insulating tube, and the conducting layer on the surface of the middle insulating tube, the conducting layer on the surface of the outer insulating tube and the conducting layer on the surfaces of the inner insulating tube are respectively and correspondingly connected with a high-voltage power supply processed by a power supply system and grounded; filling photocatalyst alumina 5 taking ultraviolet light generated by dielectric barrier discharge as an energy source in two interlayers in the three layers of insulating tubes to form an air purification unit with discharge and photocatalysis in coordination;
the fan 12 is arranged at the bottom of the inner side of the inner-layer insulating tube, the catalytic unit is filled with a catalyst, the catalytic unit is sleeved on the inner side of the inner-layer insulating tube along the same axis of the discharge-synergetic photocatalytic purification unit, the upper side of the catalytic unit is connected with the gas outlet 7 arranged at the top of the shell, the gas detection unit 9 and the ultrasonic atomization unit 13 are arranged beside the gas outlet 7, and the power supply system 6 is respectively connected to the discharge-synergetic photocatalytic purification unit, the gas detection unit 9, the control unit 8, the ultrasonic atomization unit 13 and the fan 12 through processing modules of different circuits; the control unit 8 is connected on the gas detection unit 9, and according to the signal of gas detection unit, through the operating condition of different units of PWM drive module control, anion generation unit 14, ultrasonic atomization unit 13 set up by gas outlet 7, and anion generation unit 14 sets up the top of ultrasonic atomization unit 13, and the air after water smoke, through discharge photocatalysis purification unit purification in coordination with the anion mixture back discharge clarifier that anion generation unit 14 produced.
The efficient filter screen is sequentially provided with an active carbon filter screen, an HEPA filter screen and primary filter cotton from inside to outside.
The catalytic unit can be automatically detached and replaced.
The catalyst in the catalytic unit is spherical manganese dioxide loaded with palladium.
As shown in fig. 6, the negative ion generating unit 14 is a negative corona discharge reactor, and includes a metal wire electrode 14-1, a metal cylinder electrode 14-2, an insulating housing 14-3, a front sealing end cap 14-4, and a rear sealing end cap 14-5; the metal wire electrode 14-1 is arranged in the metal cylinder electrode 14-2, the metal wire electrode 14-1 is fixed by the front sealing end cover 14-4 and the rear sealing end cover 14-5, the front sealing end cover 14-4 is provided with an air inlet 14-6, the rear sealing end cover 14-5 is provided with an air outlet 14-7, and the metal cylinder electrode 14-2 is fixed by the insulating shell 14-3, the front sealing end cover 14-4 and the rear sealing end cover 14-5.
The metal wire electrode is made of tungsten, indium or stainless steel. The reason for using a high purity tungsten needle (99.9%) as a high voltage electrode for the discharge is: the chemical property and the physical property of tungsten are stable: tungsten is stable in air at normal temperature, a compact oxide film is formed at 400-500 ℃, and actual corona discharge cannot reach the temperature at all. High hardness, high melting point, good electron emission performance, and secondary electron emission coefficient (i.e. the ratio of the number of electrons emitted from the surface of tungsten metal bombarded with ions or photons in high energy state to the number of incident ions) of 1.4 deltamMore electrons can be emitted secondarily. Meanwhile, the resistance of the tungsten needle is about 3 times greater than that of copper, so that the corona discharge loop current is smaller and safer. Similarly, the reason why indium metal is used as an electrode material is that, from room temperature to the melting point of indium, indium reacts slowly with oxygen in the air, and the process of forming an oxide film on the surface is extremely slow. Therefore, when a high voltage is applied to the indium electrode, electrons easily escape. Stainless steel is common metal, and is with low costs and discharge and carry out comparatively easily.
In addition, the surface of the wire electrode is a common thread, so that a plurality of sharp points are formed on the surface of the electrode, and the sharp points are beneficial to the escape of electrons, so that the corona discharge effect is enhanced, and more electrons and negative ions are generated.
As shown in fig. 7, the power supply system is a 12V battery, and the processing module further includes a voltage doubling rectifying circuit and a PWM driving module 4 based on an embodiment;
the power supply is divided into two branches and respectively supplies power to the discharge cooperation photocatalytic purification unit, the signal generation and control circuit, the fan and the ultrasonic atomization unit;
the first multistage boosting branch circuit sequentially BOOSTs the voltage to V through the BOOST circuit 11Then inverted into alternating current by an inverting booster circuit and the voltage is raised to V2The BOOST circuit 2 BOOSTs the voltage to VH2, and the AC current is boosted to V through the voltage doubling rectifying circuit3，V3Direct current of about 6000VThe voltage doubling rectifying circuit supplies power to the negative ion generating unit;
the second branch circuit raises the voltage to V through the BOOST voltage stabilizing circuit4The power supply circuit supplies power for the signal generation and control circuit, then drives the inversion booster circuit through the PWM driving module 1, drives the ultrasonic atomization unit through the PWM driving module 2, drives the fan through the PWM driving module 3, and drives the voltage doubling rectification circuit through the PWM driving module 4.
The circuit principle involved in the first and second embodiments is explained below:
boost inverter circuit principle:
as shown in FIG. 8, the present invention uses NE555 timer chip as oscillator, working voltage is 5V, and R is adjustedpThe output frequency can be controlled to 300kHz, and an overcurrent fusing resistor R is adopted6Protection, the duty ratio is modulated by connecting a reset pin of a 555 chip with a PWM wave, a timer is reset by a low logic potential, and then the normal work of the chip can be controlled, and then an input U is regulated and controlled3Square wave of the tube, then C4，C5Composed of a capacitor and U3The thyristor and the transformer T can realize the conversion of DC-AC, and the voltage Vout (Vout is 300-600V) can be amplified by the voltage doubling rectification connected to the rear end of the transformer.
L1And LsThe ratio of the numbers of the knots is 1: 50, let the equivalent capacitance of the DBD discharge reactor be CDBDThen, the excitation oscillation frequency f of the DBD discharge reactor can be calculated by the formula 1O，
In equation 1, Ls and Lm refer to the secondary inductance and the matching inductance of the transformer T4 in fig. 8, respectively.
Signal generation and control circuit:
the PWM control circuit achieves the function of controlling the working gear of the device by outputting PWM with different duty ratios. The working gear is controlled by duty ratio regulation and control of PWM: the duty ratios of the first gear to the fourth gear are 20%, 40%, 60% and 80%, respectively.
Concrete implementNow, the method comprises the following steps: in fig. 9, a schmitt trigger is used, and a rising edge D trigger generates a square wave pulse with a duty ratio of 50%, and a triangular wave signal is obtained through an output end of an inverse integrator circuit. Triangular wave and adjustable input voltage VRThe comparator is used to output a PWM signal with a controllable duty ratio, as shown in fig. 10.
The gear shifting circuit:
control of V by switchRPotential:
in FIG. 11, with push switch SW1, VCC is connected to pull-up resistor R14The switch is pressed to be at CLK1Generates an input pulse, and transmits information to Q according to the input port D1 at the rising edge of the clock pulse1The mouth of the patient is provided with a mouth,
is Q1To the opposite level of the voltage, controlling the switching tube Q4On/off of (Q)1The level pulse is transmitted to CLK2End rising edge trigger handle D2To Q2,
Is Q2To the opposite level of the voltage, controlling the switching tube Q5Make and break of (2). Controlled by two switching tubes, set R15:R16＝1:2,VRAVoltage is output V from formula 2 through operational amplifierRIs provided with R15//R16＝R18，
VRControl V by external pulse control signal input CLK1 terminalRTerminal output voltage, number of pulse signals and VRAnd duty ratio as shown in Table 2 (V)RA＝0.5V)。
TABLE 2 number of pulse signals and VRAnd duty ratio relationship
Voltage doubling rectifying circuit principle:
the output of the inversion booster circuit is connected to a voltage doubling rectifying circuit, and the output is output to the reactor for power supply after the rectification and voltage doubling action of the voltage doubling rectifying circuit.
As shown in FIG. 12, a voltage doubler rectifier circuit for a negative corona discharge device, a previous stage inverter booster circuit outputs a voltage Vout(Vout300-600V), the output voltage can reach after the voltage-doubling rectification
(3000 plus 6500V) can directly supply power to the reaction device.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2605966A (en) * | 2021-04-19 | 2022-10-26 | Respired Ltd | Vehicle ventilation purification device |
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