WO2022100328A1 - 一种高压电场低温等离子体冷杀菌系统电路和装置 - Google Patents

一种高压电场低温等离子体冷杀菌系统电路和装置 Download PDF

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WO2022100328A1
WO2022100328A1 PCT/CN2021/122952 CN2021122952W WO2022100328A1 WO 2022100328 A1 WO2022100328 A1 WO 2022100328A1 CN 2021122952 W CN2021122952 W CN 2021122952W WO 2022100328 A1 WO2022100328 A1 WO 2022100328A1
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Prior art keywords
voltage
output end
input end
power supply
module
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PCT/CN2021/122952
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English (en)
French (fr)
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万良淏
姚俊
徐龙
万京林
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南京苏曼等离子科技有限公司
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Priority to US17/613,768 priority Critical patent/US20230148634A1/en
Publication of WO2022100328A1 publication Critical patent/WO2022100328A1/zh

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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/015—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with pressure variation, shock, acceleration or shear stress or cavitation
    • A23L3/0155—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with pressure variation, shock, acceleration or shear stress or cavitation using sub- or super-atmospheric pressures, or pressure variations transmitted by a liquid or gas
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/32—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with electric currents without heating effect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/14—Plasma, i.e. ionised gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/26—Accessories or devices or components used for biocidal treatment
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/20—Targets to be treated
    • A61L2202/24—Medical instruments, e.g. endoscopes, catheters, sharps

Definitions

  • the invention relates to the technical field of frequency converter power supply circuits, and more particularly, to a high-voltage electric field low-temperature plasma cold sterilization system circuit and device.
  • Plasma is the fourth state in which matter exists. It consists of an ionized conductive gas that includes six typical particles, namely electrons, positive ions, negative ions, atoms or molecules in excited states, atoms or molecules in ground states, and photons.
  • the ions, electrons, excited atoms, molecules and free radicals enriched in the low temperature plasma space are all active particles, which are easy to react with the material surface. Therefore, it has been widely used in the fields of sterilization, surface modification, thin film deposition, etching processing, device cleaning and so on.
  • High-voltage electric field low-temperature plasma cold sterilization is a new type of food cold sterilization technology in the world.
  • the research was initiated by Purdue University in the United States. It stimulates the medium gas around the food to generate photoelectrons, ions, active free radicals, etc. to contact the surface of microorganisms. lead to the destruction of its cells to achieve bactericidal effect.
  • the United States Department of Agriculture (QSARU, USDA-ARS) began to research and develop a dielectric barrier discharge low-temperature plasma cold sterilization test device. .
  • Japan and South Korea have also begun to study low-temperature plasma cold sterilization technology.
  • the current international research on high-voltage electric field and low-temperature plasma food cooling sterilization is still limited to the laboratory research stage of sterilization efficacy characteristics and mechanisms.
  • Plasma sterilization technology is a new generation of high-tech sterilization technology, which can overcome some of the limitations and shortcomings of existing sterilization methods and improve the effect of sterilization.
  • the low-temperature plasma cold sterilization technology is an important breakthrough in the food cold sterilization and fresh-keeping packaging technology.
  • the sterilization treatment of packaged products will not produce secondary pollution; the plasma comes from the gas inside the package, no chemical residue will be produced, and the safety is high; although the voltage used is very high, the current is small, and the sterilization process is very short, and no heat will be generated. And the energy consumption is very low, the operation is simple and so on. Therefore, high-voltage electric field low-temperature plasma cold sterilization, as a new cold sterilization method, is especially suitable for cold sterilization of heat-sensitive foods (such as fresh livestock, poultry, fish, meat products and conditioning products, fresh fruits and vegetables, and fresh-cut vegetables, etc.).
  • heat-sensitive foods such as fresh livestock, poultry, fish, meat products and conditioning products, fresh fruits and vegetables, and fresh-cut vegetables, etc.
  • the technology can also be applied to the production line to disinfect and sterilize the products.
  • Low-temperature plasmas contain charged particles, high-energy electrons, and electrically neutral reactive particles such as free radicals, excited atoms and molecules.
  • Plasma is generated by high-voltage discharge, accompanied by complex physical and chemical effects, and shows fast and efficient sterilization ability when interacting with microorganisms.
  • the active particles in the plasma will be quickly adsorbed by the material after contacting with the substance. It is the most promising sterilization and disinfection technology, and has broad application prospects in the fields of environment, biology, and medical treatment.
  • the inverter is composed of circuits such as AC-DC-AC (modulated wave), the waveform of its output voltage is a pulsed square wave, and there are many harmonic components, and the voltage and frequency change proportionally at the same time, which cannot be adjusted separately.
  • the function is to control the power control equipment of the AC motor by changing the working power frequency of the motor.
  • a Chinese invention patent application entitled “A Dspace-based fault diagnosis platform for ship shore power system", which discloses shore power system units,
  • the shore power system unit includes an AC power supply, a transformer, a frequency converter, a filter device, a power compensation device, a grid-connected device, and a circuit breaker, and the filter device used is a capacitor.
  • the external characteristics of capacitor filtering are poor, and there is a current impact, especially in the start-stop stage, which is likely to overload the subsequent circuit and damage the circuit.
  • the purpose of the present invention is to overcome the deficiencies in the prior art that the frequency converter can only carry inductive loads but cannot drive capacitive loads, and provides a high-voltage electric field low-temperature plasma cold sterilization system circuit with adjustable output frequency and voltage of the power supply module ; Make the harmonic current entering the voltage regulation module stable.
  • the inverter is connected with a first-stage inductor, so that the clutter of the power supply and high-frequency high-order harmonics are effectively filtered out, which solves the problem that the inverter and the voltage regulator are directly connected with load, causing the inverter and the voltage regulator module to burn out.
  • the high-order harmonics fed back in the process of driving the plasma discharge can also be filtered out to ensure the stable operation of the overall circuit;
  • the second-stage inductor is connected to the voltage regulator, which solves the problem of preventing the circuit from being caused by plasma when the voltage regulation changes.
  • the negative resistance effect is generated during the body discharge process, so that the output voltage is more stable, and the system can operate reliably for a long time.
  • a high-voltage electric field low-temperature plasma cold sterilization device including a high-voltage electric field low-temperature plasma cold sterilization system circuit, which achieves the purpose of generating space plasma under large area and large spacing atmospheric pressure to achieve efficient cold sterilization of packaged food.
  • a high-voltage electric field low-temperature plasma cold sterilization system circuit of the present invention includes a power supply module for outputting harmonic current, a voltage regulation module for adjusting load voltage, current and power, and a switch module for adjusting circuit opening and closing states. And the transformer power supply module that generates high voltage;
  • the power module includes a frequency converter and a first-stage inductance;
  • the frequency converter includes an input end, an output end T1 and an output end T3, the input end is connected to the single-phase AC power supply, the output end T3 is connected to the voltage regulating module, and the output end T1 is connected to the first-stage inductance;
  • the harmonic components in the SPWM sinusoidal pulse width modulation wave output by the inverter can be effectively suppressed, and the frequency spectrum is broadened, so that the harmonic current entering the voltage regulating module is stable, reducing the heating loss of the voltage regulating module and preventing burning;
  • the voltage regulating module includes an input terminal A and an input terminal X, the input terminal A of the voltage regulating module is connected to the first-stage inductor, and the input terminal X is connected to the output terminal T3; the voltage regulating module includes an output terminal a and an output terminal x, and the output terminal a and the output terminal x is connected to the switch module;
  • the switch module includes an input end L1a and an input end L3a, the input end L1a is connected to the output end a of the voltage regulation module, and the input end L3a is connected to the output end x of the voltage regulation module;
  • the switch module includes an output end U1 and an output end U3, the output end U1 and the output end U3 are connected to the power supply module;
  • the power supply module includes an input end L1c and an input end L3c, the input end L1c is connected to the output end U1 of the switch module, and the input end L3c is connected to the output end U3 of the switch module; the power supply module includes four output ends, and the output end is connected to the load.
  • the frequency converter is a single-phase frequency converter
  • the single-phase frequency converter includes an input end L1 and an input end L2, and the input end L1 and the input end L2 are connected to a single-phase AC power supply.
  • the frequency converter is a three-phase frequency converter
  • the three-phase frequency converter includes an input end L1, an input end L2 and an input end L3, and the input end L1, the input end L2 and the input end L3 are connected to the three-phase AC power supply.
  • the voltage regulator module includes an electric voltage regulator and a second-stage inductor
  • the electric voltage regulator includes an input end A and an input end X, and the input end A of the electric voltage regulator is connected to the first-stage inductance
  • the input terminal X of the electric voltage regulator is connected to the output terminal T3 of the single-phase inverter
  • the electric voltage regulator includes an output terminal a and an output terminal x, and the output terminal a of the electric voltage regulator is connected to one end of the second-stage inductance.
  • the second-stage inductor is connected to the back of the device, which solves the problem of avoiding the negative resistance effect when the circuit changes in voltage regulation and making the output voltage stable.
  • the other end of the second-stage inductor is connected to the switch module; the output end x of the electric voltage regulator is connected to the switch module.
  • the output end of the electric voltage regulator is filtered again by the inductance, which is more conducive to the effective suppression of harmonic components.
  • the switch module includes an AC contactor and a solid state relay; the AC contactor has at least six contacts; the solid state relay has an input end L1b and an input end L3b, and an output end U1 and an output end U3; the switch module The input end L1a of the AC contactor is the contact 1 of the AC contactor, the input end L3a of the switch module is the contact 5 of the AC contactor, the contact 1 of the AC contactor is connected with the second-stage inductor, and the contact 5 of the AC contactor is The output end of the electric voltage regulator is connected; the contact 2 of the AC contactor is connected to the input end L1b of the solid state relay, and the contact 5 of the AC contactor is connected to the input end L3b of the solid state relay; Point 4 is reserved; the output end U1 and output end U3 of the solid state relay are connected to the power supply module.
  • the solid state relay is fully isolated in the circuit to reduce interference, increase service life and work stability.
  • the power supply module includes a first transformer, the output end U1 and the output end U3 of the solid state relay are respectively connected to both ends of the primary coil of the first transformer; the output of the secondary coil of the first transformer is connected to the load.
  • the power supply module further includes a second transformer, and the first transformer and the second transformer are connected in parallel. By connecting in parallel, the input voltage of the two transformers can be guaranteed to be the same.
  • the power supply module includes at least two transformers, and the transformers are connected in parallel. Suitable for a variety of loads.
  • a capacitor is connected in parallel between the output end T1 and the output end T3 of the single-phase inverter. Further improve the filtering effect.
  • a high-voltage electric field low-temperature plasma cold sterilization device of the present invention includes a casing and a high-voltage electric field low-temperature plasma cold sterilization system circuit, and the high-voltage electric field low-temperature plasma cold sterilization system circuit is installed in the casing.
  • the output voltage of the power module is controllable, and the harmonic components in the output SPWM sinusoidal pulse width modulation wave are effectively suppressed, and the frequency spectrum is expanded, so that the voltage entering the voltage regulation module is The harmonic current is stable, and the second-stage inductor is connected after the voltage regulator, which solves the problem of avoiding the negative resistance effect when the circuit changes in voltage regulation, and makes the output voltage stable.
  • the high-voltage electric field low-temperature plasma cold sterilization device of the present invention includes a high-voltage electric field low-temperature plasma cold sterilization system circuit, with reasonable structure design, simple principle, and easy popularization and use.
  • Figure 1 is a schematic diagram of the conventional inverter-controlled motor wiring
  • Fig. 2 is the module diagram of the present invention
  • Fig. 3 is the circuit schematic diagram of the present invention.
  • FIG. 4 is a circuit schematic diagram of the present invention.
  • inverter 10, inverter; 20, motor; 100, power supply module; 110, single-phase inverter; 120, first-stage inductor; 130, three-phase inverter; 200, voltage regulator module; 210, electric voltage regulator; 220, 300, switch module; 310, AC contactor; 320, solid state relay; 400, power supply module; 410, first transformer; 420, second transformer.
  • FIG. 1 is a circuit diagram of a conventional inverter using a motor, including the inverter 10 and the motor 20 , and its conventional working principle will not be described here.
  • FIG. 2 is a block diagram of the circuit of the high-voltage electric field low-temperature plasma cold sterilization system circuit of the present invention.
  • a high-voltage electric field low-temperature plasma cold sterilization system circuit comprising a power module 100 for outputting harmonic current, a voltage regulation module 200 for adjusting load voltage, current and power, and a switch module 300 for adjusting circuit opening and closing states and a transformer power supply module 400 that generates high voltage.
  • the power module 100 can be connected to a single-phase power input or a three-phase power input, and outputs a single-phase voltage.
  • the output voltage of the power supply module 100 is controllable, and the harmonic components in the output SPWM sinusoidal pulse width modulation wave are effectively suppressed, and the frequency spectrum is expanded, so that the harmonic current entering the voltage regulation module 200 is stable.
  • the power supply module 100 includes two or three power input terminals. Specifically, when a single-phase power supply (such as AC220) is used, the power supply module 100 includes two power supply input terminals; when a three-phase power supply (such as AC380) is used, the power supply Module 100 includes three power inputs. The power module 100 includes two output terminals, and the output terminals are connected to the voltage regulation module 200 .
  • a single-phase power supply such as AC220
  • a three-phase power supply such as AC380
  • the voltage regulating module 200 is connected between the power module 100 and the load, and adjusts the voltage, current and power applied to the load.
  • the output voltage of the voltage regulation module 200 is controllable.
  • the voltage regulation module 200 includes two input terminals, and the input terminals are connected to the output terminal of the power supply module 100 .
  • the voltage regulation module 200 includes two output terminals, and the output terminals are connected to the switch module 300 .
  • the switch module 300 is connected between the voltage regulation module 200 and the power supply module 400 to control the opening and closing of the circuit, while isolating the power module 100, the voltage regulation module 200 and the power supply module 400, reducing mutual interference and improving service life.
  • the switch module 300 includes two input terminals, and the input terminals are connected to the voltage regulation module 200 .
  • the switch module 300 includes two output terminals, and the output terminals are connected to the power supply module 400 .
  • the switch module 300 can be controlled to open and close in an automatic control manner.
  • the power supply module 400 is the working part of the present invention, and is used for powering the high-voltage electric field low-temperature plasma generating circuit, which can generate high voltage.
  • the power supply module 400 includes two input terminals, and the input terminals are connected to the switch module 300 .
  • the power supply module 400 includes four output terminals, and the output terminals are connected to the low temperature plasma discharge unit (not shown in the figure).
  • the number of output terminals of the power supply module 400 can be adjusted as required.
  • FIG. 3 is a circuit diagram of a circuit of a high-voltage electric field low-temperature plasma cold sterilization system.
  • the power module 100 includes a single-phase inverter 110, and the single-phase inverter 110 includes two input terminals, which are connected to a single-phase power supply (such as AC220).
  • a single-phase power supply such as AC220
  • the single-phase inverter The output terminal T1 of the 110 is connected to one end of the first-stage inductor 120 , and the other end of the first-stage inductor 120 is connected to the voltage regulating module 200 ; the output terminal T3 of the single-phase inverter 110 is connected to the voltage regulating module 200 .
  • a capacitor can also be connected in parallel between the two output terminals T1 and T3 of the single-phase inverter 110 to enhance the filtering effect.
  • the voltage regulator module 200 includes an electric voltage regulator 210, the electric voltage regulator 210 includes two input ends, the input end A of the electric voltage regulator 210 is connected to the first-stage inductor 120; the input end of the electric voltage regulator 210 X is connected to the output terminal T3 of the single-phase inverter 110 .
  • the electric voltage regulator 210 includes two output terminals. The output terminal a of the electric voltage regulator 210 is connected to one end of the second-stage inductance 220, and the other end of the second-stage inductance 220 is connected to the switch module 300; the output terminal x of the electric voltage regulator 210 The switch module 300 is connected.
  • the switch module 300 includes an AC contactor 310 and a solid state relay 320 .
  • the AC contactor 310 has at least six contacts; the solid state relay 320 has two input terminals and two output terminals.
  • the contact 1 of the AC contactor 310 is connected to the second-stage inductor 220 , the contact 5 of the AC contactor 310 is connected to the output terminal x of the electric voltage regulator 210 ; the contact 2 of the AC contactor 310 is connected to the input of the solid state relay 320
  • the terminal L1b is connected, and the contact 6 of the AC contactor 310 is connected to the input terminal L3b of the solid state relay 320; the contact 3 and the contact 4 of the AC contactor 310 are reserved.
  • the above contacts are normally open contacts.
  • the AC contactor 310 can use an automatic control method to control the opening and closing states of its contacts.
  • the power supply and the coil contacts of the AC contactor 310 are connected into a loop through the output signal and output COM of the PLC.
  • the output of the switch quantity is used to control whether the coil of the AC contactor 310 is energized.
  • the output end U1 and the output end U3 of the solid state relay 320 are connected to the power supply module 400 .
  • Most of the existing power supply outputs are continuous waveforms. After using the AC contactor 310 and the solid state relay 320, intermittent discharge can be realized, and intermittent discharge is formed in the time domain to form a pulse waveform.
  • the power supply module 400 includes a first transformer 410 and a second transformer 420.
  • the first transformer 410 and the second transformer 420 are connected in parallel, thereby ensuring that the input voltages at both ends of the first transformer 410 and the second transformer 420 remain the same.
  • the output end U1 and the output end U3 of the solid state relay 320 are respectively connected to the input end L1c and the input end L3c of the first transformer 410 and the second transformer 420, and the primary coils of the first transformer 410 and the second transformer 420 are connected in parallel.
  • the outputs of the secondary coils of the first transformer 410 and the second transformer 420 are respectively connected to loads.
  • the number of transformers can be more than two, which can be set as required.
  • the circuit of the high-voltage electric field low-temperature plasma cold sterilization system circuit of the present embodiment has the same basic circuit connection mode as that of the second embodiment, and the improvements are as follows:
  • the power module 100 includes a three-phase inverter 130, the three-phase inverter 130 includes three input terminals, and is connected to a three-phase power supply (such as AC380).
  • the output terminal T1 of the three-phase inverter 130 is connected to one end of the first-stage inductor 120.
  • the other end of the primary inductor 120 is connected to the voltage regulation module 200 ;
  • the output end T3 of the three-phase inverter 130 is connected to the voltage regulation module 200 .
  • a capacitor can also be connected in parallel between the two output ends T1 and T3 of the three-phase inverter 130 to enhance the filtering effect.
  • the use of three-phase inverters can be applied to some situations that need to be expanded to connect more loads, of course, it is not limited to such situations.
  • the voltage regulation module 200 includes an electric voltage regulator 210, and the electric voltage regulator 210 includes two input ends.
  • the input end A of the electric voltage regulator 210 is connected to the first-stage inductor 120; X is connected to the output terminal T3 of the three-phase inverter 130 .
  • the electric voltage regulator 210 includes two output terminals.
  • the output terminal a of the electric voltage regulator 210 is connected to one end of the second-stage inductance 220, and the other end of the second-stage inductance 220 is connected to the switch module 300; the output terminal x of the electric voltage regulator 210
  • the switch module 300 is connected.
  • the single-phase alternating current is input to the power input terminal of the single-phase inverter 110 ; or the three-phase alternating current is input to the power input terminal of the three-phase inverter 130 .
  • the output end of the single-phase inverter 110 or the three-phase inverter 130 outputs a single-phase AC PWM sinusoidal pulse width modulation wave, and after passing through the first-stage inductor 120, the modulated pulse width output by the single-phase inverter 110 or the three-phase inverter 130
  • the harmonics are filtered and effectively suppressed, and the frequency spectrum is broadened, so that the harmonic current entering the primary coil of the electric voltage regulator 210 is stabilized, and the heating loss of the electric voltage regulator 210 coil is reduced. input power is achieved.
  • the frequency converter output frequency range f is 50-200Hz.
  • the output voltage of the electric voltage regulator 210 is filtered by the second-stage inductor 220, and then enters the input end of the solid state relay 320 through the AC contactor 310 (the contact closing condition is controlled).
  • the solid state relay 320 has an intermittent trigger voltage signal, the solid state relay 320 The on-off is performed at a certain frequency, which plays the role of protecting the terminal high-voltage discharge and heat dissipation control.
  • the pulse voltage of a certain frequency enters the primary coil loops B1 and B2 of the first transformer 410 and the second transformer 420. Due to the principle of electromagnetic induction, the secondary coils B1' and B2' generate high voltage to drive the load.
  • a high-voltage electric field low-temperature plasma cold sterilization device using the high-voltage electric field low-temperature plasma cold sterilization system circuit of embodiment 1 or embodiment 2 or embodiment 3, and comprising a casing, and the high-voltage electric field low-temperature plasma cold sterilization system is electrically arranged in the casing. Inside.
  • the form of the housing is set according to the circuit arrangement of the high-voltage electric field low-temperature plasma cold sterilization system.
  • the applicable field of the present invention is not limited to the field of food, but can also be used in fields that require sterilization and disinfection, such as medical instruments, books and periodicals.

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  • Engineering & Computer Science (AREA)
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  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
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  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Inverter Devices (AREA)

Abstract

一种高压电场低温等离子体冷杀菌系统电路，包括用于输出谐波电流的电源模块（100），用于调整负载电压、电流和功率的调压模块（200），用于调整电路开合状态的开关模块（300）和产生高压的变压器供电模块（400）；电源模块包括单相变频器（110）和第一级电感（120），单相变频器（110）包括输入端和两个输出端，输入端连接交流电源，输出端连接调压模块（200）；在变频器输出端与调压器之间串接电感，使之达到电抗器的功能，使变频器输出的SPWM正弦脉宽调制波中的谐波分量得到有效抑制，并且使频谱展宽，使进入调压模块的谐波电流稳定，减少调压模块的发热损耗，防止烧毁。

Description

一种高压电场低温等离子体冷杀菌系统电路和装置 技术领域
本发明涉及变频器电源电路技术领域，更具体地说，涉及一种高压电场低温等离子体冷杀菌系统电路和装置。
背景技术
等离子体是物质存在的第四种状态。它由电离的导电气体组成，其中包括六种典型的粒子，即电子、正离子、负离子、激发态的原子或分子、基态的原子或分子以及光子。
低温等离子体空间富集的离子、电子、激发态原子、分子及自由基均为活性粒子，易于和材料表面发生反应。因而在灭菌、表面改性、薄膜沉积、刻蚀加工、器件清洗等领域得到广泛应用。
高压电场低温等离子体冷杀菌是目前国际上一种新型的食品冷杀菌技术，2009年由美国普渡大学发起研究，通过激发食品周围介质气体产生光电子、离子、活性自由基团等与微生物表面接触导致其细胞破坏而达到杀菌效果。2012年美国农业部(QSARU,USDA–ARS)开始研究开发介质阻挡放电低温等离子体冷杀菌试验装置，研究生鲜鸡肉等冷杀菌保鲜效能特性，在生鲜肉等生鲜食品中取得良好杀菌效果。近3年，日本、韩国等也开始研究低温等离子体冷杀菌技术。但目前国际关于高压电场低温等离子体食品上冷杀菌研究还局限在杀菌效能特性及机理的实验室研究阶段。
等离子体灭菌技术是新一代的高科技灭菌技术，它能克服现有灭菌方法的一些局限性和不足之处，提高消毒灭菌效果。
与目前广泛采用的热杀菌技术比较，低温等离子体冷杀菌技术是食品冷杀菌保鲜包装技术的重要突破。对包装产品杀菌处理不会产生二次污染；等离子体来源于包装内部气体，不会产生化学残留，安全性高；尽管使用的电压非常高，但电流微小、杀菌过程很短不会产生热量，且能耗很低、操作简便等。因此，高压电场低温等离子体冷杀菌作为一种新的冷杀菌方式，特别适用于对热敏感食品(如生鲜畜禽鱼类肉制品及调理产品、新鲜果蔬及鲜切菜等)冷杀菌。
生鲜调理食品市场消费所占比例越来越大，其货架期短导致浪费严重；传统商业杀菌技术对生鲜产品风味颜色、感官品质等有较大影响，高压电场低温等离子体冷杀菌作为一种国际新兴的非热杀菌技术，具备的高效自动化、冷杀菌无残留、低碳绿色等优势。
本技术还可应用到生产流水线上对产品进行消毒灭菌处理。低温等离子体包含带电粒子、高能电子以及电中性的活性粒子，如自由基、激发态原子和分子等。等离子体由高电压放电 产生，伴随着复杂的物理化学效应，在与微生物作用时体现出了快速高效的灭菌能力，同时等离子体中的活性粒子与物质接触后会很快被材料吸附，吸附后驻留在材料上持续起到灭菌作用，是目前最有前途的杀菌消毒技术，在环境、生物、医疗等领域有广泛的应用前景。
随着变频器技术的普及，变频器的应用也越来越广泛，主要涉及的领域是电机调速的基础电源，来满足电机调速的要求。但是由于变频器是由交流-直流-交流(调制波)等电路构成的，其输出电压的波形为脉冲方波，且谐波成分多，电压和频率同时按比例变化，不可分别调整，常规下作用是通过改变电机工作电源频率方式来控制交流电动机的电力控制设备，不符合作为驱动功率放电的电源使用的，但其作为电源电路的拓展领域在目前不能得到广泛的应用。
比如，名为“一种基于Dspace的船舶岸电系统故障诊断平台”的中国发明专利申请(申请号：201910052776.0，申请日：2019年1月21日)，该申请案公开了岸电系统单元，岸电系统单元包括交流电源、变压器、变频器、滤波装置、功率补偿装置、并网装置、断路器，其中采用的滤波装置为电容。电容滤波外特性较差，有电流冲击，尤其是启停阶段，很可能造成后续电路过载，损坏电路。
发明内容
1.发明要解决的技术问题
本发明的目的在于克服现有技术中变频器只能带载感性负载而不能驱动容性负载的不足，提供了一种高压电场低温等离子体冷杀菌系统电路，电源模块的输出频率和电压可调；使得进入调压模块的谐波电流稳定。变频器外接第一级电感，使得电源的杂波及高频的高次谐波被有效滤掉，解决了变频器与调压器直接连接带载，造成变频器及调压模块会烧毁的故障，同时驱动等离子体放电过程中所反馈回来的高次谐波也可被滤掉，保障整体回路的稳定运行；调压器后接第二级电感，解决了电路在电压调节变化时，避免因等离子体放电过程中产生负阻效应，从而使输出电压更加稳定，系统可长时间可靠运行。
同时提供了一种高压电场低温等离子体冷杀菌装置，包括高压电场低温等离子体冷杀菌系统电路，达到了在大面积大间距大气压下产生空间等离子体达到对包装食品高效冷杀菌的目的。
2.技术方案
为达到上述目的，本发明提供的技术方案为：
本发明的一种高压电场低温等离子体冷杀菌系统电路，包括用于输出谐波电流的电源模 块，用于调整负载电压、电流和功率的调压模块，用于调整电路开合状态的开关模块和产生高压的变压器供电模块；
电源模块包括变频器和第一级电感；变频器包括输入端和输出端T1和输出端T3，输入端连接单相交流电源，输出端T3连接调压模块，输出端T1连接第一级电感；使变频器输出的SPWM正弦脉宽调制波中的谐波分量可得到有效抑制，并且使频谱展宽，使进入调压模块的谐波电流稳定，减少调压模块发热损耗，防止烧毁；
调压模块包括输入端A和输入端X，调压模块的输入端A与第一级电感连接，输入端X与输出端T3连接；调压模块包括输出端a和输出端x，输出端a和输出端x与开关模块连接；
开关模块包括输入端L1a和输入端L3a，输入端L1a与调压模块的输出端a连接，输入端L3a与调压模块的输出端x连接；开关模块包括输出端U1和输出端U3，输出端U1和输出端U3与供电模块连接；
供电模块包括输入端L1c和输入端L3c，输入端L1c与开关模块输出端U1连接，输入端L3c与开关模块输出端U3连接；供电模块包括四个输出端，输出端与负载连接。
作为本发明更进一步的改进，变频器为单相变频器，单相变频器包括输入端L1和输入端L2，输入端L1和输入端L2连接单相交流电源。可以适应单相交流电(AC220)输入。
作为本发明更进一步的改进，变频器为三相变频器，三相变频器包括输入端L1、输入端L2和输入端L3，输入端L1、输入端L2和输入端L3连接三相交流电源。可以适应三相交流电(AC380)输入。
作为本发明更进一步的改进，调压模块包括电动调压器和第二级电感，电动调压器包括输入端A和输入端X，电动调压器的输入端A与第一级电感连接；电动调压器的输入端X与单相变频器输出端T3连接；电动调压器包括输出端a和输出端x，电动调压器的输出端a与第二级电感的一端连接，调压器后接第二级电感，解决了电路在电压调节变化时，避免产生负阻效应，使输出电压稳定。第二级电感的另一端连接开关模块；电动调压器的输出端x连接开关模块。电动调压器输出端再次经过电感进行滤波，更有利于谐波分量的有效抑制。
作为本发明更进一步的改进，开关模块包括交流接触器和固态继电器；交流接触器具有至少六个触点；固态继电器具有输入端L1b和输入端L3b，和输出端U1和输出端U3；开关模块的输入端L1a为交流接触器的触点1，开关模块的输入端L3a为交流接触器的触点5，交流接触器的触点1与第二级电感连接，交流接触器的触点5与电动调压器的输出端连接；交流接触器的触点2与固态继电器的输入端L1b连接，交流接触器的触点5与固态继电器的输入端L3b连接；交流接触器的触点2和触点4备用；固态继电器的输出端U1和输出端U3与供电模块连接。固态继电器作为无触点开关在电路中的充分隔离减少干扰，增加使用寿命 和工作稳定性。因此，在电源回路中，可以形成脉冲电源供电的形式。
作为本发明更进一步的改进，供电模块包括第一变压器，固态继电器的输出端U1和输出端U3分别与第一变压器的初级线圈的两端连接；第一变压器的次级线圈输出连接负载。
作为本发明更进一步的改进，供电模块还包括第二变压器，第一变压器和第二变压器并联连接。通过并联可以保证两个变压器输入电压的一致。
作为本发明更进一步的改进，供电模块包括至少两个变压器，各变压器并联连接。适合多种负载的需要。
作为本发明更进一步的改进，单相变频器输出端T1和输出端T3之间并联有电容。进一步提升滤波效果。
本发明的一种高压电场低温等离子体冷杀菌装置，包括外壳和高压电场低温等离子体冷杀菌系统电路，高压电场低温等离子体冷杀菌系统电路安装在外壳内。
3.有益效果
采用本发明提供的技术方案，与现有技术相比，具有如下有益效果：
本发明的一种高压电场低温等离子体冷杀菌系统电路，电源模块的输出电压可控，且输出的SPWM正弦脉宽调制波中的谐波分量得到有效抑制，频谱得到扩展，使得进入调压模块的谐波电流稳定，调压器后接第二级电感，解决了电路在电压调节变化时，避免产生负阻效应，使输出电压稳定。本发明的一种高压电场低温等离子体冷杀菌装置，包括高压电场低温等离子体冷杀菌系统电路，结构设计合理，原理简单，便于推广使用。
附图说明
图1为常规变频器控制电机接线示意图；
图2为本发明的模块图；
图3为本发明的电路原理图；
图4为本发明的电路原理图。
示意图中的标号说明：
10、变频器；20、电机；100、电源模块；110、单相变频器；120、第一级电感；130、三相变频器；200、调压模块；210、电动调压器；220、第二级电感；300、开关模块；310、交流接触器；320、固态继电器；400、供电模块；410、第一变压器；420、第二变压器。
具体实施方式
为进一步了解本发明的内容，结合附图和实施例对本发明作详细描述。
本说明书附图所绘示的结构、比例、大小等，均仅用以配合说明书所揭示的内容，以供熟悉此技术的人士了解与阅读，并非用以限定本发明可实施的限定条件，故不具技术上的实质意义，任何结构的修饰、比例关系的改变或大小的调整，在不影响本发明所能产生的功效及所能达成的目的下，均应仍落在本发明所揭示的技术内容得能涵盖的范围内。同时，本说明书中所引用的如“上”、“下”、“左”、“右”、“中间”等用语，亦仅为便于叙述的明了，而非用以限定可实施的范围，其相对关系的改变或调整，在无实质变更技术内容下，当亦视为本发明可实施的范畴。
请结合图1，图1为常规变频器使用接电机的电路图，包括变频器10和电机20，其常规工作原理在此不再描述。
下面结合实施例对本发明作进一步的描述。
实施例1
请结合图2，图2是本发明高压电场低温等离子体冷杀菌系统电路的模块图。
一种高压电场低温等离子体冷杀菌系统电路，包括用于输出谐波电流的电源模块100、用于调整负载电压、电流和功率的调压模块200、用于调整电路开合状态的开关模块300和产生高压的变压器供电模块400。
电源模块100可以外接单相电源输入或者三相电源输入，并且输出单相电压。电源模块100的输出电压可控，且输出的SPWM正弦脉宽调制波中的谐波分量得到有效抑制，频谱得到扩展，使得进入调压模块200的谐波电流稳定。
电源模块100包括两个或三个电源输入端，具体地说，当采用单相电源(如AC220)时，电源模块100包括两个电源输入端；当采用三相电源(如AC380)时，电源模块100包括三个电源输入端。电源模块100包括两个输出端，输出端与调压模块200连接。
调压模块200接在电源模块100和负载中间，调整加到负载上的电压、电流和功率。调压模块200的输出电压可控。
调压模块200包括两个输入端，输入端与电源模块100的输出端连接。调压模块200包括两个输出端，输出端与开关模块300连接。
开关模块300接在调压模块200与供电模块400之间，控制电路的开合，同时可以隔离电源模块100、调压模块200与供电模块400，减少互相干扰，提高使用寿命。
开关模块300包括两个输入端，输入端与调压模块200连接。开关模块300包括两个输出端，输出端与供电模块400连接。
优选的，开关模块300可以采用自动控制的方式控制其开合。
供电模块400是本发明的工作部分，用于为高压电场低温等离子体产生电路供电，其可以产生高电压。
供电模块400包括两个输入端，输入端与开关模块300连接。供电模块400包括四个输出端，输出端与低温等离子体放电单元(图中未示出)连接。
优选的，供电模块400的输出端数量可以根据需要进行调整。
实施例2
请结合图3，图3是高压电场低温等离子体冷杀菌系统电路的电路图。本实施例的高压电场低温等离子体冷杀菌系统电路，其中电源模块100包括单相变频器110，单相变频器110包括两个输入端，与单相电源(如AC220)连接，单相变频器110输出端T1与第一级电感120的一端连接，第一级电感120的另一端连接调压模块200；单相变频器110输出端T3连接调压模块200。根据需要，还可以在单相变频器110两个输出端T1和T3之间并联一个电容，增强滤波效果。
再结合图3，调压模块200包括电动调压器210，电动调压器210包括两个输入端，电动调压器210输入端A与第一级电感120连接；电动调压器210输入端X与单相变频器110输出端T3连接。电动调压器210包括两个输出端，电动调压器210输出端a与第二级电感220的一端连接，第二级电感220的另一端连接开关模块300；电动调压器210输出端x连接开关模块300。
优选的，第二级电感感抗＝(1～1.5)×(负载静态时刻的容抗×10 3)，第一级电感感抗＝(0.5～2)×第二级电感感抗。
再结合图3，开关模块300包括交流接触器310和固态继电器320。交流接触器310具有至少六个触点；固态继电器320具有两个输入端和两个输出端。交流接触器310的触点1与第二级电感220连接，交流接触器310的触点5与电动调压器210的输出端x连接；交流接触器310的触点2与固态继电器320的输入端L1b连接，交流接触器310的触点6与固态继电器320的输入端L3b连接；交流接触器310的触点3和触点4备用。基于安全考虑，以上触点均为常开触点。优选的，交流接触器310可以采用自动控制的方式控制其各触点的开合状态，比如采用由PLC的输出信号和输出COM把电源和交流接触器310的线圈触点串成一个回路，通过开关量的输出来控制交流接触器310线圈是否通电。固态继电器320的输出端U1和输出端U3与供电模块400连接。现有的电源输出的大多是连续的波形，采用交流接触器310和固态继电器320后可以实现间断性放电，在时域上形成间断性放电，形成脉冲波形。
结合图3，供电模块400包括第一变压器410和第二变压器420，第一变压器410和第二变压器420并联连接，由此可以保证第一变压器410和第二变压器420两端输入电压保持一 致。固态继电器320的输出端U1和输出端U3分别与第一变压器410和第二变压器420的输入端L1c和输入端L3c连接，第一变压器410和第二变压器420的初级线圈并联。第一变压器410和第二变压器420的次级线圈输出分别连接负载。
优选的，变压器数量可以多于2个，根据需要可进行设置。
实施例3
请结合图4，本实施例的高压电场低温等离子体冷杀菌系统电路，其基本电路连接方式与实施例2相同，改进之处在于：
电源模块100包括三相变频器130，三相变频器130包括三个输入端，与三相电源(如AC380)连接，三相变频器130输出端T1与第一级电感120的一端连接，第一级电感120的另一端连接调压模块200；三相变频器130输出端T3连接调压模块200。根据需要，还可以在三相变频器130两个输出端T1和T3之间并联一个电容，增强滤波效果。使用三相变频器可以适用某些需要扩大的连接更多负载的情况，当然也不仅限于这样的情况。
再结合图4，调压模块200包括电动调压器210，电动调压器210包括两个输入端，电动调压器210输入端A与第一级电感120连接；电动调压器210输入端X与三相变频器130输出端T3连接。电动调压器210包括两个输出端，电动调压器210输出端a与第二级电感220的一端连接，第二级电感220的另一端连接开关模块300；电动调压器210输出端x连接开关模块300。
实施例4
结合图3和图4，采用实施例2或实施例3的高压电场低温等离子体冷杀菌系统电路，本实施例的工作原理为：
单相交流电输入到单相变频器110电源输入端；或三相交流电输入到三相变频器130电源输入端。单相变频器110或三相变频器130输出端输出单相交流的PWM正弦脉宽调制波，经第一级电感120后，将单相变频器110或三相变频器130输出的调制脉宽谐波过滤，并得到有效抑制，并且使频谱展宽，使进入电动调压器210初级线圈的谐波电流稳定，减少电动调压器210线圈发热损耗烧毁，使变频器作为电动调压器210的输入电源得以实现。
变频器输出频率范围f为50——200Hz。电动调压器210输出电压经第二级电感220滤波，经交流接触器310(触点闭合条件受控)进入到固态继电器320输入端，当固态继电器320有间歇性触发电压信号，固态继电器320通断按照一定频率进行，起到保护末端高压放电和散热控制的作用。一定频率脉冲电压进入到第一变压器410和第二变压器420的初级线圈回路B1和B2，由于电磁感应原理，次级线圈B1’和B2’产生高压带动负载。
实施例5
一种高压电场低温等离子体冷杀菌装置，采用实施例1或实施例2或实施例3的高压电场低温等离子体冷杀菌系统电路，并包括外壳，高压电场低温等离子体冷杀菌系统电设置在外壳内。
外壳的形式根据高压电场低温等离子体冷杀菌系统电路的布置设置，可以包括一个底面和三个侧面，另一个侧面敞开，便于安装和维护电路。
值得说明的是，本发明可以应用的领域不仅限于食品领域，还可以用于医疗器械、书籍报刊等需要杀菌消毒的领域。
以上示意性的对本发明及其实施方式进行了描述，该描述没有限制性，附图中所示的也只是本发明的实施方式之一，实际的结构并不局限于此。所以，如果本领域的普通技术人员受其启示，在不脱离本发明创造宗旨的情况下，不经创造性的设计出与该技术方案相似的结构方式及实施例，均应属于本发明的保护范围。

Claims (10)

  1. 一种高压电场低温等离子体冷杀菌系统电路，其特征在于：包括用于输出谐波电流的电源模块，用于调整负载电压、电流和功率的调压模块，用于调整电路开合状态的开关模块和产生高压的变压器供电模块；
    所述电源模块包括变频器和第一级电感；所述变频器包括输入端和输出端T1、T3，所述输入端连接交流电源，所述输出端T3连接所述调压模块，所述输出端T1连接所述第一级电感；
    所述调压模块包括输入端A和输入端X，所述调压模块的输入端A与所述第一级电感连接，所述输入端X与所述输出端T3连接；所述调压模块包括输出端a和输出端x，所述输出端a和所述输出端x与所述开关模块连接；
    所述开关模块包括输入端L1a和输入端L3a，所述输入端L1a与所述调压模块的输出端a连接，所述输入端L3a与所述调压模块的输出端x连接；所述开关模块包括输出端U1和输出端U3，所述输出端U1和所述输出端U3与所述供电模块连接；
    所述供电模块包括输入端L1c和输入端L3c，所述输入端L1c与所述开关模块输出端U1连接，所述输入端L3c与所述开关模块输出端U3连接；所述供电模块包括四个输出端，所述输出端与负载连接。
  2. 根据权利要求1所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述变频器为单相变频器，所述单相变频器包括输入端L1和输入端L3，和输出端T1、输出端T3，所述输入端L1和输入端L2连接单相交流电源。
  3. 根据权利要求1所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述变频器为三相变频器，所述三相变频器包括输入端L1、输入端L2和输入端L3，和输出端T1、输出端T3；所述输入端L1、输入端L2和输入端L3连接三相交流电源。
  4. 根据权利要求1所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述调压模块包括电动调压器和第二级电感，所述电动调压器包括输入端A和输入端X，所述电动调压器的输入端A与所述第一级电感连接；所述电动调压器的输入端X与所述单相变频器输出端T3连接；所述电动调压器包括输出端a和输出端x，所述电动调压器的输出端a与所述第二级电感的一端连接，所述第二级电感的另一端连接所述开关模块；所述电动调压器的输出端x连接所述开关模块。
  5. 根据权利要求4所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述开关模块包括交流接触器和固态继电器；所述交流接触器具有至少六个触点；所述固态继电器具有输入端L1b和输入端L3b，和输出端U1和输出端U3；所述开关模块的输入端L1a为所述交流接触器的触点1，所述开关模块的输入端L3a为所述交流接触器的触点5，所述交流接 触器的触点1与所述第二级电感连接，所述交流接触器的触点5与所述电动调压器的输出端连接；所述交流接触器的触点2与所述固态继电器的输入端L1b连接，所述交流接触器的触点5与所述固态继电器的输入端L3b连接；所述交流接触器的触点2和触点4备用；所述固态继电器的输出端U1和输出端U3与所述供电模块连接。
  6. 根据权利要求5所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述供电模块包括第一变压器，所述固态继电器的输出端U1和输出端U3分别与所述第一变压器的初级线圈的两端连接；所述第一变压器的次级线圈输出连接负载。
  7. 根据权利要求6所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述供电模块还包括第二变压器，所述第一变压器和所述第二变压器并联连接。
  8. 根据权利要求7所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述供电模块包括至少两个变压器，各变压器差分连接。
  9. 根据权利要求1-8任一所述的高压电场低温等离子体冷杀菌系统电路，其特征在于：所述单相变频器输出端T1和输出端T3之间并联有电容。
  10. 一种高压电场低温等离子体冷杀菌装置，其特征在于：包括外壳和权利要求1-9任一所述的高压电场低温等离子体冷杀菌系统电路，所述高压电场低温等离子体冷杀菌系统电路安装在所述外壳内。
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