阅读说明：本技术 一种高压电场低温等离子体冷杀菌装置 (High-voltage electric field low-temperature plasma cold sterilization device ) 是由 万良淏 姚俊 徐龙 万京林 于 2020-11-13 设计创作，主要内容包括：本发明公开了一种高压电场低温等离子体冷杀菌装置,属于变频器电源电路技术领域。本发明的一种高压电场低温等离子体冷杀菌装置,外壳内前部设置有变频器、第一级电感、电动调压器、交流接触器和固态继电器,外壳后部设置有变压器,体积较大的变压器设置在外壳的内侧,体积较小的变频器、第一级电感、电动调压器、第二级电感、交流接触器和固态继电器位于外壳的外侧,便于安装和拆卸,也便于观察各结构的工作情况；变频器外接第一级电感,使得输出电压可控,调制波中的谐波分量抑制,频谱扩展,使得进入调压模块的谐波电流稳定。(The invention discloses a high-voltage electric field low-temperature plasma cold sterilization device, and belongs to the technical field of frequency converter power circuits. According to the high-voltage electric field low-temperature plasma cold sterilization device, the frequency converter, the first-stage inductor, the electric voltage regulator, the alternating current contactor and the solid-state relay are arranged at the front part in the shell, the transformer is arranged at the rear part of the shell, the transformer with the larger volume is arranged at the inner side of the shell, and the frequency converter, the first-stage inductor, the electric voltage regulator, the second-stage inductor, the alternating current contactor and the solid-state relay with the smaller volume are positioned at the outer side of the shell, so that the high-voltage electric field low-temperature plasma cold sterilization device is; the frequency converter is externally connected with a first-stage inductor, so that the output voltage is controllable, harmonic components in the modulated wave are suppressed, the frequency spectrum is expanded, and the harmonic current entering the voltage regulating module is stable.)

1. The utility model provides a cold sterilizing equipment of high-tension electric field low temperature plasma, includes the shell, its characterized in that: a frequency converter, an inductor, an electric voltage regulator, an alternating current contactor, a solid-state relay and a transformer are arranged in the shell; the frequency converter, the inductor, the electric voltage regulator, the alternating current contactor and the solid-state relay are arranged at the front part of the shell, and the transformer is arranged at the rear part of the shell; the input end of the frequency converter is connected with an alternating current power supply, the output end T1 of the frequency converter is connected with the first-stage inductor and then connected with the input end A of the electric voltage regulator, and the output end T3 of the frequency converter is connected with the input end X of the electric voltage regulator; the output end of the electric voltage regulator is connected with the input end of the alternating current contactor, the output end of the alternating current contactor is connected with the input end of the solid-state relay, and the output end of the solid-state relay is connected with the input end of the transformer.

2. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 1, characterized in that: the frequency converter is a single-phase frequency converter, the single-phase frequency converter comprises an input end L1, an input end L3, an output end T1 and an output end T3, and the input end L1 and the input end L2 are connected with a single-phase alternating current power supply.

3. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 1, characterized in that: the frequency converter is a three-phase frequency converter, and the three-phase frequency converter comprises an input end L1, an input end L2, an input end L3, an output end T1 and an output end T3; and the input end L1, the input end L2 and the input end L3 are connected with a three-phase alternating current power supply.

4. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 1, characterized in that: the transformer comprises a first transformer and a second transformer; or, the transformer comprises more than three transformers; and all transformers are connected in parallel; and the back panel is provided with high-voltage output ends, the number of the high-voltage output ends is the same as that of the transformers, and the positions of the high-voltage output ends correspond to the transformers one by one.

5. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 1, characterized in that: the alternating current contactor is provided with at least six contacts; and the output end a of the electric voltage regulator is connected with the contact 1 of the alternating current contactor after the second-stage inductor, and the output end x of the electric voltage regulator is connected with the contact 5 of the alternating current contactor.

6. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 5, wherein: the first-stage inductor is perpendicular to the second-stage inductor.

7. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 6, wherein: the left side wall comprises a left straight section and a left slope section, and the right side wall comprises a right straight section and a right slope section; the rear parts of the left slope section and the right slope section are higher than the front parts.

8. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 6, wherein: the shell comprises a bottom panel, a left side panel, a right side panel and a back panel, wherein the bottom panel is provided with a lead for connecting the frequency converter, the first-stage inductor, the electric voltage regulator, the second-stage inductor, the alternating current contactor, the solid-state relay and the transformer; the left side plate and the right side plate are respectively provided with a heat dissipation hole; the frequency converter is close to the right side plate and close to the heat dissipation hole in the right side plate; the electric voltage regulator is close to the left side plate and close to the heat dissipation hole in the left side plate.

9. The high-voltage electric field low-temperature plasma cold sterilization device according to claim 8, wherein: an exhaust fan is arranged in the heat dissipation hole; and/or, the louvre is two that set up side by side, the converter with the louvre that electronic voltage regulator is close to the front portion, the transformer is close to the louvre at rear portion.

10. The high-voltage electric field low-temperature plasma cold sterilization device according to any one of claims 1 to 9, characterized in that: and a capacitor is connected in parallel between the output end T1 and the output end T3 of the single-phase frequency converter.

Technical Field

The invention relates to the technical field of power circuits of frequency converters, in particular to a high-voltage electric field low-temperature plasma cold sterilization device.

Background

Plasma is the fourth state in which a substance is present. It consists of an ionized conductive gas, which includes six typical species of particles, namely electrons, positive ions, negative ions, excited state atoms or molecules, ground state atoms or molecules, and photons.

Ions, electrons, excited atoms, molecules and free radicals enriched in the low-temperature plasma space are active particles and are easy to react with the surface of a material. Therefore, the method is widely applied to the fields of sterilization, surface modification, film deposition, etching processing, device cleaning and the like.

High-voltage electric field low-temperature plasma cold sterilization is a novel food cold sterilization technology internationally at present, and in 2009, the research is initiated by the university of Pudu, and the sterilization effect is achieved by exciting medium gas around food to generate photoelectrons, ions, active free radicals and the like to contact with the surfaces of microorganisms to cause the destruction of cells of the microorganisms. In 2012, 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, research the cold sterilization and fresh-keeping efficacy characteristics of fresh chicken and the like, and obtain a good sterilization effect in fresh food such as fresh meat and the like. In recent 3 years, low-temperature plasma cold sterilization technology has also been studied in japan, korea, and the like. However, the international research on cold sterilization of food by high-voltage electric field and low-temperature plasma is limited to the laboratory research stage of sterilization performance characteristics and mechanism.

The plasma sterilization technology is a new generation of high-tech sterilization technology, can overcome some limitations and disadvantages of the existing sterilization method, and improves the sterilization effect.

Compared with the thermal sterilization technology widely adopted at present, the low-temperature plasma cold sterilization technology is an important breakthrough of the food cold sterilization and fresh-keeping packaging technology. The packaged product is sterilized without secondary pollution; the plasma comes from gas inside the package, so that no chemical residue is generated, and the safety is high; although the voltage used is very high, the current is small, the sterilization process is short, no heat is generated, the energy consumption is low, the operation is simple and convenient, and the like. Therefore, the high-voltage electric field low-temperature plasma cold sterilization is used as a new cold sterilization mode and is particularly suitable for cold sterilization of heat sensitive foods (such as fresh livestock, poultry, fish, meat products and conditioning products, fresh fruits, vegetables, fresh vegetables and the like).

The market consumption proportion of fresh prepared food is larger and larger, and the waste is serious due to short shelf life of the fresh prepared food; the traditional commercial sterilization technology has great influence on the flavor, color, sensory quality and the like of fresh products, and the high-voltage electric field low-temperature plasma cold sterilization is taken as an international emerging non-thermal sterilization technology and has the advantages of high efficiency and automation, no residue in cold sterilization, low carbon and green performance and the like.

The technology can also be applied to the production line for carrying out disinfection and sterilization treatment on products. The low temperature plasma contains charged particles, energetic electrons, and electrically neutral reactive particles such as radicals, excited atoms, and molecules. The plasma is generated by high-voltage discharge, and along with complex physical and chemical effects, the plasma shows rapid and efficient sterilization capability when acting with microorganisms, and meanwhile, active particles in the plasma are quickly adsorbed by materials after contacting with substances and stay on the materials to continuously play a sterilization role after adsorption, so that the plasma is the most promising sterilization and disinfection technology at present, and has wide application prospects in the fields of environment, biology, medical treatment and the like.

Along with the popularization of the frequency converter technology, the application of the frequency converter is more and more extensive, and the main related field is a basic power supply for motor speed regulation to meet the requirement of the motor speed regulation. However, since the frequency converter is composed of circuits such as ac-dc-ac (modulated wave), the waveform of the output voltage is a pulse square wave, and the harmonic components are many, and the voltage and frequency are changed in proportion at the same time, and cannot be adjusted respectively, the power control device of the ac motor is controlled by changing the working power frequency of the motor under the conventional action, which is not suitable for being used as a power source for driving power discharge, but the frequency converter cannot be widely applied as an expanded field of the power circuit at present.

For example, the application of the Chinese invention patent named as a Dspace-based ship shore power system fault diagnosis platform discloses a shore power system unit, wherein the shore power system unit comprises an alternating current power supply, a transformer, a frequency converter, a filtering device, a power compensation device, a grid-connected device and a circuit breaker, and the adopted filtering device is a capacitor. The external characteristic of the capacitor filtering is poor, current impact exists, and particularly in the starting and stopping stage, the overload of a subsequent circuit is likely to be caused, and the circuit is damaged.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defect that a frequency converter in the prior art can only carry an inductive load but cannot drive a capacitive load, and provides a high-voltage electric field low-temperature plasma cold sterilization device.A transformer with larger volume is arranged at the rear part of a shell, and a single-phase frequency converter with smaller volume, a first-stage inductor, an electric voltage regulator, a second-stage inductor, an alternating current contactor and a solid-state relay are positioned at the front part of the shell, so that the device is convenient to mount and dismount and is also convenient to observe the working conditions of all structures; the frequency converter is externally connected with the first-stage inductor, so that clutter and high-frequency higher harmonics of a power supply are effectively filtered, the problem that the frequency converter and a voltage regulating module are burnt due to the fact that the frequency converter is directly connected with a voltage regulator is solved, meanwhile, the higher harmonics fed back in the plasma discharge process are also filtered, and the stable operation of an integral loop is guaranteed; the second-stage inductor is connected behind the voltage regulator, so that the problem that negative resistance effect is generated in the plasma discharge process when the voltage of the circuit is regulated and changed is solved, the output voltage is more stable, and the system can reliably run for a long time.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention discloses a high-voltage electric field low-temperature plasma cold sterilization device which comprises a shell, wherein a frequency converter, a first-stage inductor, an electric voltage regulator, an alternating current contactor, a solid-state relay and a transformer are arranged in the shell; the frequency converter, the first-stage inductor, the electric voltage regulator, the alternating current contactor and the solid-state relay are arranged at the front part of the shell, and the transformer is arranged at the rear part of the shell; the input end of the frequency converter is connected with an alternating current power supply, the output end T1 of the frequency converter is connected with the first-stage inductor and then connected with the input end A of the electric voltage regulator, and the output end T3 of the frequency converter is connected with the input end X of the electric voltage regulator; the output end of the electric voltage regulator is connected with the input end of the alternating current contactor, the output end of the alternating current contactor is connected with the input end of the solid-state relay, and the output end of the solid-state relay is connected with the input end of the transformer. The circuit is arranged on the bottom panel, so that the connection among the following structures is facilitated, the circuit can be ensured not to be exposed, and the working safety is ensured; the transformer with larger volume is arranged at the rear part of the shell, and the frequency converter with smaller volume, the first-stage inductor, the electric voltage regulator, the second-stage inductor, the alternating current contactor and the solid-state relay are positioned at the front part of the shell, so that the transformer is convenient to mount and dismount and is also convenient to observe the working conditions of all structures; the external first order inductance of converter for output voltage is controllable, and the harmonic component in the SPWM sinusoidal pulse width modulation wave of output obtains effective suppression, and the frequency spectrum obtains the extension, makes the harmonic current who gets into the voltage regulation module stable, and ac contactor and solid state relay can make in power supply loop, form the form of pulse power supply. The structure design is reasonable, the principle is simple, and the popularization and the use are convenient.

As a further improvement of the invention, the frequency converter is a single-phase frequency converter, the single-phase frequency converter comprises an input end L1 and an input end L3, and an output end T1 and an output end T3, and the input end L1 and the input end L2 are connected with a single-phase alternating current power supply. A single phase alternating current (e.g., AC220) power supply may be suitable.

As a further improvement of the present invention, the frequency converter is a three-phase frequency converter, and the three-phase frequency converter includes an input end L1, an input end L2, an input end L3, an output end T1, and an output end T3; the input terminal L1, the input terminal L2, and the input terminal L3 are connected to a three-phase ac power supply. A three-phase alternating current (such as AC380) power supply may be suitable.

As a further improvement of the present invention, the transformer includes a first transformer and a second transformer; or, the transformer comprises more than three transformers; and all transformers are connected in parallel; the back panel is provided with high-voltage output ends, the number of the high-voltage output ends is the same as that of the transformers, and the positions of the high-voltage output ends correspond to the transformers one by one. The number of transformers can be set as required.

As a further improvement of the invention, the device also comprises a second-stage inductor, wherein the alternating current contactor is provided with at least six contacts; the output end a of the electric voltage regulator is connected with the contact 1 of the alternating current contactor after being connected with the second-stage inductor, and the output end x of the electric voltage regulator is connected with the contact 5 of the alternating current contactor. The contact 3 and the contact 4 of the alternating current contactor are spare, the alternating current contactor 310 can control the opening and closing state of each contact in an automatic control mode, an electric voltage regulator, a solid-state relay and a transformer can be isolated, mutual interference is reduced, and the service life is prolonged. The second-stage inductor is connected behind the voltage regulator, so that the problem that a negative resistance effect is avoided when the voltage of the circuit is regulated and changed is solved, and the output voltage is stable.

As a further improvement of the invention, the first-stage inductor is perpendicular to the second-stage inductor. The influence of mutual inductance between the two is reduced.

As a further improvement of the invention, the left side wall comprises a left straight section and a left slope section, and the right side wall comprises a right straight section and a right slope section; the rear parts of the left slope section and the right slope section are higher than the front parts. On the one hand, the installation and the disassembly are convenient, and on the other hand, the bottom panel, the left side panel, the right side panel and the back panel are favorable for effectively forming electromagnetic shielding.

As a further improvement of the invention, the housing comprises a bottom panel, a left side panel, a right side panel and a back panel, wherein the bottom panel is provided with a lead for connecting the frequency converter, the first-stage inductor, the electric voltage regulator, the second-stage inductor, the alternating current contactor, the solid-state relay and the transformer; the left side plate and the right side plate are respectively provided with a heat dissipation hole; the frequency converter is close to the right side plate and close to the heat dissipation hole on the right side plate; the circuit on the bottom panel is convenient for each device to connect, and the electric voltage regulator is close to the left side board and close to the heat dissipation hole on the left side board. The heat dissipation effect is convenient to promote.

As a further improvement of the invention, an exhaust fan is arranged in the heat dissipation hole; and/or, the louvre is two for setting up side by side, and the converter is close to anterior louvre with electronic voltage regulator, and the transformer is close to the louvre at rear portion. Further improving the heat dissipation effect.

As a further improvement of the invention, a capacitor is connected in parallel between the output end T1 and the output end T3 of the single-phase frequency converter. The filtering effect is enhanced.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

the invention relates to a high-voltage electric field low-temperature plasma cold sterilization device which comprises a shell, wherein a transformer with larger volume is arranged at the rear part of the shell, and a single-phase frequency converter, a first-stage inductor, an electric voltage regulator, a second-stage inductor, an alternating current contactor and a solid-state relay with smaller volume are positioned at the front part of the shell, so that the high-voltage electric field low-temperature plasma cold sterilization device is convenient to mount and dismount and is also convenient to observe the working conditions of all structures; the frequency converter is externally connected with a first-stage inductor, so that the output voltage is controllable, harmonic components in the output SPWM sinusoidal pulse width modulation wave are effectively suppressed, the frequency spectrum is expanded, the harmonic current entering the voltage regulating module is stable, and the second-stage inductor is connected behind the voltage regulator, so that the problem that a negative resistance effect is avoided when the voltage regulation of a circuit is changed, and the output voltage is stable is solved. The structure design is reasonable, the principle is simple, and the popularization and the use are convenient.

Drawings

FIG. 1 is a schematic wiring diagram of a conventional inverter-controlled motor;

FIG. 2 is a block diagram of the present invention;

FIG. 3 is a circuit schematic of the present invention;

FIG. 4 is a circuit schematic of the present invention;

FIG. 5 is a schematic view of the apparatus of the present invention.

The reference numerals in the schematic drawings illustrate:

10. a frequency converter; 20. a motor; 100. a power supply module; 110. a single-phase frequency converter; 120. a first stage inductance; 130. a three-phase frequency converter; 200. a voltage regulating module; 210. an electric voltage regulator; 220. a second stage inductance; 300. a switch module; 310. an AC contactor; 320. a solid state relay; 400. a power supply module; 410. a first transformer; 420. a second transformer; 500. a housing; 510. a bottom panel; 520. a left side plate; 521. a left straight section; 522. a left ramp section; 530. a right side plate; 531. a right straight section; 532. a right ramp section; 540. a back panel; 541. a first high voltage output terminal; 542. a second high voltage output terminal.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.

Referring to fig. 1, fig. 1 is a circuit diagram of a conventional inverter using a motor, including an inverter 10 and a motor 20, and the conventional operation principle thereof will not be described herein.

The present invention will be further described with reference to the following examples.

Example 1

Referring to fig. 2, fig. 2 is a block diagram of the high-voltage electric field low-temperature plasma cold sterilization apparatus according to the present invention.

A high-voltage electric field low-temperature plasma cold sterilization device comprises a shell 500, a power supply module 100, a voltage regulating module 200, a switch module 300 and a power supply module 400, wherein the power supply module 100 is positioned in the shell 500 and used for outputting harmonic current, the voltage regulating module 200 is used for regulating load voltage, current and power, the switch module 300 is used for regulating the opening and closing state of a circuit, and the power supply module 400 is used for generating high voltage.

The housing 500 includes four walls, a bottom panel 510, a left side panel 520, a right side panel 530, and a back panel 540. Wherein, the left side plate 520 and the right side plate 530 are respectively provided with heat dissipation holes, preferably two heat dissipation holes are respectively provided, the two heat dissipation holes are horizontally arranged in parallel, one is close to the back plate 540, and the other is far away from the back plate 540; the heat dissipation holes are opened at the lower portions of the left and right side plates 520 and 530. Preferably, an exhaust fan can be arranged in each heat dissipation hole, so that the heat dissipation effect is enhanced. The left plate 520 and the right plate 530 have a left straight section 521 and a right straight section 531 on the rear (near the back plate 540) side, respectively, and have a slope section 522, 532 on the rear forward portion, and the left slope section 522 and the right slope section 532 are both gradually reduced toward the front portion, that is, the height of the front (far from the back plate 540) of the left plate 520 and the right plate 530 is lower than that of the rear portion. The bottom panel 510 is provided with wires for facilitating the connection between the following structures, and also can ensure that the circuit is not exposed and the work safety is ensured.

The power module 100 may be externally connected to a single phase power input or a three phase power input and output a single phase voltage. The output voltage of the power module 100 is controllable, and the harmonic component in the output SPWM sine pulse width modulated wave is effectively suppressed, and the frequency spectrum is expanded, so that the harmonic current entering the voltage regulating module 200 is stable.

The power module 100 includes two or three power inputs, and in particular, when a single phase power supply (e.g., AC220) is used, the power module 100 includes two power inputs; when a three-phase power supply (e.g., AC380) is used, the power module 100 includes three power inputs. The power module 100 includes two output terminals, which are connected to the voltage regulating module 200.

Referring to fig. 3, the power module 100 includes a single-phase inverter 110, the single-phase inverter 110 includes two input terminals connected to a single-phase power source (e.g., AC220), an output terminal T1 of the single-phase inverter 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 end T3 of the single-phase frequency converter 110 is connected with the voltage regulating module 200. According to the requirement, a capacitor can be connected in parallel between the two output ends T1 and T3 of the single-phase frequency converter 110, so that the filtering effect is enhanced.

Referring to fig. 5, the single-phase inverter 110 is located at the rear of the right side plate 530, specifically, at the rear of the heat dissipation holes opened in the right side plate 530 and away from the back plate 540, and is fixed to the bottom plate 510. The first stage inductor 120 is positioned at the middle front of the housing 500 and fixed to the bottom panel 510.

The voltage regulating module 200 is connected between the power module 100 and the load, and the voltage, current and power applied to the load can be regulated by matching with a corresponding trigger control circuit board. The output voltage of the voltage regulating module 200 is controllable.

The voltage regulating module 200 includes two inputs connected to the output of the power module 100. The voltage regulating module 200 includes two output terminals, which are connected to the switch module 300.

Referring to fig. 3, the voltage regulating module 200 includes an electric voltage regulator 210, the electric voltage regulator 210 includes two input terminals, and an input terminal a of the electric voltage regulator 210 is connected to the first stage inductor 120; the input terminal X of the electric voltage regulator 210 is connected to the output terminal T3 of the single-phase inverter 110. The electric voltage regulator 210 comprises two output ends, the output end a of the electric voltage regulator 210 is connected with one end of the second-stage inductor 220, and the other end of the second-stage inductor 220 is connected with the switch module 300; the output terminal x of the electric voltage regulator 210 is connected with the switch module 300.

Referring to fig. 5, the electric regulator 210 is located behind the left side plate 520, specifically, behind a heat dissipation hole opened in the left side plate 520 and away from the back plate 540, and is fixed to the bottom plate 510. The second stage inductor 220 is positioned between the electric regulator 210 and the first stage inductor 120 and is fixed to the bottom panel 510. The second-stage inductor 220 and the first-stage inductor 120 are perpendicular to each other, so that the influence of mutual inductance between the two inductors is reduced.

The switch module 300 is connected between the voltage regulating module 200 and the power supply module 400, controls the opening and closing of the circuit, and can isolate the power supply module 100, the voltage regulating module 200 and the power supply module 400, thereby reducing mutual interference and prolonging the service life.

The switch module 300 includes two inputs connected to the voltage regulation module 200. The switch module 300 includes two output terminals, which are connected to the power supply module 400.

Preferably, the switch module 300 can control the opening and closing thereof in an automatic control manner.

Referring to fig. 3, 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. A contact 1 of the alternating current contactor 310 is connected with the second-stage inductor 220, and a contact 5 of the alternating current contactor 310 is connected with an output end x of the electric voltage regulator 210; the contact 2 of the ac contactor 310 is connected to the input terminal L1b of the solid-state relay 320, and the contact 6 of the ac contactor 310 is connected to the input terminal L3b of the solid-state relay 320; contact 3 and contact 4 of the ac contactor 310 are spare. Based on safety considerations, the contacts are all normally open contacts. Preferably, the ac contactor 310 may control the open/close state of each contact in an automatic control manner, for example, a power source and a coil contact of the ac contactor 310 are connected in a loop by an output signal of a PLC and an output COM, and whether the coil of the ac contactor 310 is energized or not is controlled by the output of a switching value. The output terminal U1 and the output terminal U3 of the solid-state relay 320 are connected to the power supply module 400. Most of the existing power supply output is continuous waveform, and after the alternating current contactor 310 and the solid-state relay 320 are adopted, intermittent discharge can be realized, and the intermittent discharge can be formed in the time domain to form pulse waveform.

Referring to fig. 5, an ac contactor 310 and a solid state relay 320 are located between the single phase inverter 110 and the first stage inductor 120. The ac contactor 310 is close to the single-phase inverter 110, and the solid-state relay 320 is close to the first-stage inductor 120, so as to facilitate connection between the solid-state relay 320 and the power supply module 400.

The power supply module 400 is a working part of the present invention, and is used for supplying power to the high-voltage electric field low-temperature plasma generating circuit, which can generate high voltage.

The power supply module 400 includes two input terminals, which are connected to the switch module 300. The power supply module 400 includes four output terminals, and the output terminals are connected to a low temperature plasma discharge unit (not shown).

Preferably, the number of output terminals of the power supply module 400 can be adjusted as required.

Referring to fig. 3 and 5, the power supply module 400 includes a first transformer 410 and a second transformer 420, and the first transformer 410 and the second transformer 420 are connected in parallel, so that it is ensured that input voltages at two ends of the first transformer 410 and the second transformer 420 are consistent. The output terminal U1 and the output terminal U3 of the solid-state relay 320 are connected to the input terminal L1c and the input terminal L3c of the first transformer 410 and the second transformer 420, respectively, and the primary coils of the first transformer 410 and the second transformer 420 are connected in parallel. The secondary coil outputs of the first transformer 410 and the second transformer 420 are respectively connected to a load.

Due to the relatively large volume of the transformer, the first transformer 410 and the second transformer 420 are disposed on the side of the casing 500 close to the back panel 540 and are disposed parallel to the back panel 540, i.e. behind the left straight section 521 and the right straight section 531, where the heights of the left side plate 520 and the right side plate 530 are relatively high, and at this time, the bottom panel 510, the left side plate 520, the right side plate 530 and the back panel 540 can effectively form an electromagnetic shield to avoid interference between the transformer and the external environment. Meanwhile, the heat dissipation holes on the left and right sidewalls 520 and 530 near the back panel 540 are disposed near the first and second transformers 410 and 420. The back plate 540 has a first high voltage output end 541 opposite to the first transformer 410, and the first high voltage output end 541 is connected to the secondary coil of the first transformer 410; the back plate 540 has a second high voltage output 542 opposite to the second transformer 420, and the second high voltage output 542 is connected to the secondary winding of the second transformer 420.

Preferably, the number of the transformers can be more than 2, and the transformers can be arranged according to requirements. At the same time, the number and position of the high voltage output terminals are consistent with the number of the transformers, i.e. the same number, and the positions are located at the positions where the back plate 540 faces the transformers.

The first transformer 410 and the second transformer 420 with large volume are arranged at the rear part of the shell 500, and the single-phase frequency converter 110, the first-stage inductor 120, the electric voltage regulator 210, the second-stage inductor 220, the alternating current contactor 310 and the solid-state relay 320 with small volume are arranged at the front part of the shell 500, so that the installation and the disassembly are convenient, and the working condition of each structure is convenient to observe.

Example 2

Referring to fig. 4 and 5, the basic structure of the high-voltage electric field low-temperature plasma cold sterilization apparatus of the present embodiment is the same as that of embodiment 1, and the improvement is that:

the power module 100 comprises a three-phase frequency converter 130, the three-phase frequency converter 130 comprises three input ends and is connected with a three-phase power supply (such as AC380), an output end T1 of the three-phase frequency converter 130 is connected with one end of the first-stage inductor 120, and the other end of the first-stage inductor 120 is connected with the voltage regulating module 200; the output end T3 of the three-phase frequency converter 130 is connected with the voltage regulating module 200. According to the requirement, a capacitor can be connected in parallel between the two output ends T1 and T3 of the three-phase frequency converter 130, so that the filtering effect is enhanced.

Referring to fig. 4 again, the voltage regulation module 200 includes an electric voltage regulator 210, the electric voltage regulator 210 includes two input terminals, and an input terminal a of the electric voltage regulator 210 is connected to the first-stage inductor 120; the input terminal X of the electric voltage regulator 210 is connected to the output terminal T3 of the three-phase inverter 130. The electric voltage regulator 210 comprises two output ends, the output end a of the electric voltage regulator 210 is connected with one end of the second-stage inductor 220, and the other end of the second-stage inductor 220 is connected with the switch module 300; the output terminal x of the electric voltage regulator 210 is connected with the switch module 300.

Preferably, the second stage inductance-inductance is (1-1.5) × (capacitance-inductance at the moment of load quiescent × 10³) And the first stage inductance is (0.5-2) multiplied by the second stage inductance.

Referring to fig. 5, the three-phase inverter 130 is located at the rear of the right side plate 530, specifically, at the rear of the louvers formed in the right side plate 530, which are far from the back plate 540, and is fixed to the bottom plate 510. The first stage inductor 120 is positioned at the middle front of the housing 500 and fixed to the bottom panel 510.

Example 3

With reference to fig. 3 and 4, the high-voltage electric field low-temperature plasma cold sterilization device of embodiment 1 or embodiment 2 is adopted, and the working principle of the embodiment is as follows:

the single-phase alternating current is input to the power input end of the single-phase frequency converter 110; or three-phase ac power to the power input of the three-phase inverter 130. The output end of the single-phase frequency converter 110 or the three-phase frequency converter 130 outputs a PWM sine pulse width modulation wave of single-phase alternating current, after passing through the first-stage inductor 120, the PWM sine pulse width modulation wave output by the single-phase frequency converter 110 or the three-phase frequency converter 130 is filtered, effectively suppressed, and the frequency spectrum is widened, so that the harmonic current entering the primary coil of the electric voltage regulator 210 is stable, the heating loss burning of the coil of the electric voltage regulator 210 is reduced, and the frequency converter is used as an input power supply of the electric voltage regulator 210. The use of a three-phase frequency converter can be applied to some situations where more loads need to be connected, which need to be enlarged, and is certainly not limited to such situations.

The output frequency range f of the frequency converter is 50-200 Hz. The output voltage of the electric voltage regulator 210 is filtered by the second-stage inductor 220 and enters the input end of the solid-state relay 320 through the alternating current contactor 310 (the contact closing condition is controlled), when the solid-state relay 320 has an intermittent trigger voltage signal, the solid-state relay 320 is switched on and off according to a certain frequency, and the functions of protecting the high-voltage discharge at the tail end and controlling the heat dissipation are achieved. Pulse voltage with certain frequency enters primary coil loops B1 and B2 of the first transformer 410 and the second transformer 420, and secondary coils B1 'and B2' generate high voltage to drive loads due to the principle of electromagnetic induction.

It is worth to say that the applicable field of the invention is not limited to the food field, but also can be used in the fields of medical appliances, books and periodicals and the like which need sterilization and disinfection.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.