阅读说明：本技术 一种高压电场低温等离子体冷杀菌系统电路和装置 (High-voltage electric field low-temperature plasma cold sterilization system circuit and device ) 是由 万良淏 姚俊 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系统电路和装置,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；电源模块包括单相变频器和第一级电感,变频器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；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。(The invention discloses a high-voltage electric field low-temperature plasma cold sterilization system circuit and device, and belongs to the technical field of frequency converter power circuits. The invention discloses a high-voltage electric field low-temperature plasma cold sterilization system circuit, which comprises a power supply module for outputting harmonic current, a voltage regulating module for regulating load voltage, current and power, a switch module for regulating the switching state of the circuit and a transformer power supply module for generating high voltage; the power module comprises a single-phase frequency converter and a first-stage inductor, the frequency converter comprises an input end and two output ends, the input end is connected with an alternating-current power supply, and the output end is connected with the voltage regulating module; the inductor is connected in series between the output end of the frequency converter and the voltage regulator to achieve the function of the reactor, so that harmonic components in the SPWM sinusoidal pulse width modulation wave output by the frequency converter are effectively inhibited, the frequency spectrum is widened, the harmonic current entering the voltage regulating module is stable, the heating loss of the voltage regulating module is reduced, and the burning is prevented.)

1. The utility model provides a cold sterilization system circuit of high-voltage electric field low temperature plasma which characterized in that: the power supply module is used for outputting harmonic current, the voltage regulating module is used for regulating load voltage, current and power, the switch module is used for regulating the circuit switching state, and the transformer power supply module is used for generating high voltage;

the power supply module comprises a frequency converter and a first-stage inductor; the frequency converter comprises an input end, output ends T1 and T3, the input end is connected with an alternating current power supply, the output end T3 is connected with the voltage regulating module, and the output end T1 is connected with the first-stage inductor;

the voltage regulating module comprises an input end A and an input end X, the input end A of the voltage regulating module is connected with the first-stage inductor, and the input end X is connected with the output end T3; the voltage regulating module comprises an output end a and an output end x, and the output end a and the output end x are connected with the switch module;

the switch module comprises an input end L1a and an input end L3a, the input end L1a is connected with the output end a of the voltage regulating module, and the input end L3a is connected with the output end x of the voltage regulating module; the switch module comprises an output terminal U1 and an output terminal U3, and the output terminal U1 and the output terminal U3 are connected with the power supply module;

the power supply module comprises an input end L1c and an input end L3c, the input end L1c is connected with the output end U1 of the switch module, and the input end L3c is connected with the output end U3 of the switch module; the power supply module comprises four output ends, and the output ends are connected with a load.

2. The high-voltage electric field low-temperature plasma cold sterilization system circuit 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 system circuit 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 system circuit according to claim 1, characterized in that: the voltage regulating module comprises an electric voltage regulator and a second-stage inductor, the electric voltage regulator comprises an input end A and an input end X, and the input end A of the electric voltage regulator is connected with the first-stage inductor; the input end X of the electric voltage regulator is connected with the output end T3 of the single-phase frequency converter; the electric voltage regulator comprises an output end a and an output end x, the output end a of the electric voltage regulator is connected with one end of the second-stage inductor, and the other end of the second-stage inductor is connected with the switch module; and the output end x of the electric voltage regulator is connected with the switch module.

5. The high-voltage electric field low-temperature plasma cold sterilization system circuit according to claim 4, characterized in that: the switch module comprises an alternating current contactor and a solid-state relay; the AC contactor has at least six contacts; the solid-state relay is provided with an input end L1b, an input end L3b, an output end U1 and an output end U3; the input end L1a of the switch module is a contact 1 of the alternating current contactor, the input end L3a of the switch module is a contact 5 of the alternating current contactor, the contact 1 of the alternating current contactor is connected with the second-stage inductor, and the contact 5 of the alternating current contactor is connected with the output end of the electric voltage regulator; the contact 2 of the alternating current contactor is connected with the input end L1b of the solid-state relay, and the contact 5 of the alternating current contactor is connected with the input end L3b of the solid-state relay; the contact 2 and the contact 4 of the alternating current contactor are reserved; the output end U1 and the output end U3 of the solid-state relay are connected with the power supply module.

6. The high-voltage electric field low-temperature plasma cold sterilization system circuit according to claim 5, characterized in that: the power supply module comprises a first transformer, and an output end U1 and an output end U3 of the solid-state relay are respectively connected with two ends of a primary coil of the first transformer; and the output of the secondary coil of the first transformer is connected with a load.

7. The high-voltage electric field low-temperature plasma cold sterilization system circuit according to claim 6, characterized in that: the power supply module further comprises a second transformer, and the first transformer and the second transformer are connected in parallel.

8. The high-voltage electric field low-temperature plasma cold sterilization system circuit according to claim 7, characterized in that: the power supply module comprises at least two transformers, and the transformers are in differential connection.

9. The high-voltage electric field low-temperature plasma cold sterilization system circuit according to any one of claims 1 to 8, 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.

10. The utility model provides a cold sterilizing equipment of high-voltage electric field low temperature plasma which characterized in that: the high-voltage electric field low-temperature plasma cold sterilization system circuit comprises a shell and the high-voltage electric field low-temperature plasma cold sterilization system circuit as claimed in any one of claims 1 to 9, wherein the high-voltage electric field low-temperature plasma cold sterilization system circuit is installed in the shell.

Technical Field

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

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 system circuit, wherein the output frequency and the voltage of a power supply module are adjustable; so that the harmonic current entering the voltage regulating module is stable. 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.

Simultaneously, the high-voltage electric field low-temperature plasma cold sterilization device comprises a high-voltage electric field low-temperature plasma cold sterilization system circuit, and achieves the purpose of generating space plasma under large-area large-space atmospheric pressure to achieve efficient cold sterilization of packaged food.

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 system circuit, which comprises a power supply module for outputting harmonic current, a voltage regulating module for regulating load voltage, current and power, a switch module for regulating the switching state of the circuit and a transformer power supply module for generating high voltage;

the power supply module comprises a frequency converter and a first-stage inductor; the frequency converter comprises an input end, an output end T1 and an output end T3, wherein the input end is connected with a single-phase alternating current power supply, the output end T3 is connected with the voltage regulating module, and the output end T1 is connected with the first-stage inductor; harmonic components in the SPWM sinusoidal pulse width modulation wave output by the frequency converter can be effectively inhibited, the frequency spectrum is widened, the harmonic current entering the voltage regulating module is stable, the heating loss of the voltage regulating module is reduced, and the burning is prevented;

the voltage regulating module comprises an input end A and an input end X, the input end A of the voltage regulating module is connected with the first-stage inductor, and the input end X is connected with the output end T3; the voltage regulating module comprises an output end a and an output end x, and the output end a and the output end x are connected with the switch module;

the switch module comprises an input end L1a and an input end L3a, the input end L1a is connected with the output end a of the voltage regulating module, and the input end L3a is connected with the output end x of the voltage regulating module; the switch module comprises an output end U1 and an output end U3, and the output end U1 and the output end U3 are connected with the power supply module;

the power supply module comprises an input end L1c and an input end L3c, wherein the input end L1c is connected with the output end U1 of the switch module, and the input end L3c is connected with the output end U3 of the switch module; the power supply module comprises four output ends, and the output ends are connected with the load.

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 L2, and the input end L1 and the input end L2 are connected with a single-phase alternating current power supply. Single phase alternating current (AC220) input may be accommodated.

As a further improvement of the present invention, the frequency converter is a three-phase frequency converter, the three-phase frequency converter includes an input terminal L1, an input terminal L2 and an input terminal L3, and 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 (AC380) input may be accommodated.

As a further improvement of the present invention, the voltage regulation module comprises an electric voltage regulator and a second-stage inductor, the electric voltage regulator comprises an input end a and an input end X, and the input end a of the electric voltage regulator is connected with the first-stage inductor; the input end X of the electric voltage regulator is connected with the output end T3 of the single-phase frequency converter; the electric voltage regulator comprises an output end a and an output end x, the output end a of the electric voltage regulator is connected with one end of the second-stage inductor, and the second-stage inductor is connected behind the voltage regulator, so that the problem that a negative resistance effect is avoided when a circuit is adjusted and changed in voltage is solved, and the output voltage is stable. The other end of the second-stage inductor is connected with the switch module; and the output end x of the electric voltage regulator is connected with the switch module. The output end of the electric voltage regulator is filtered by the inductor again, so that effective suppression of harmonic components is facilitated.

As a further improvement of the present invention, the switch module includes an ac contactor and a solid-state relay; the alternating current contactor is provided with at least six contacts; the solid-state relay is provided with an input end L1b, an input end L3b, an output end U1 and an output end U3; an input end L1a of the switch module is a contact 1 of the alternating current contactor, an input end L3a of the switch module is a contact 5 of the alternating current contactor, the contact 1 of the alternating current contactor is connected with the second-stage inductor, and the contact 5 of the alternating current contactor is connected with the output end of the electric voltage regulator; a contact 2 of the alternating current contactor is connected with an input end L1b of the solid-state relay, and a contact 5 of the alternating current contactor is connected with an input end L3b of the solid-state relay; the contact 2 and the contact 4 of the alternating current contactor are reserved; and the output end U1 and the output end U3 of the solid-state relay are connected with the power supply module. The solid-state relay is used as a contactless switch to fully isolate in a circuit, so that interference is reduced, the service life is prolonged, and the working stability is improved. Therefore, in the power supply circuit, a form of pulse power supply can be formed.

As a further improvement of the present invention, the power supply module includes a first transformer, and the output terminal U1 and the output terminal U3 of the solid-state relay are respectively connected to two ends of the primary coil of the first transformer; the secondary coil output of the first transformer is connected with a load.

As a further improvement of the invention, the power supply module further comprises a second transformer, the first transformer and the second transformer being connected in parallel. The input voltages of the two transformers can be ensured to be consistent through parallel connection.

As a further development of the invention, the power supply module comprises at least two transformers, each transformer being connected in parallel. Is suitable for the requirements of various loads.

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. Further improving the filtering effect.

The invention discloses a high-voltage electric field low-temperature plasma cold sterilization device which comprises a shell and a high-voltage electric field low-temperature plasma cold sterilization system circuit, wherein the high-voltage electric field low-temperature plasma cold sterilization system circuit is arranged in the shell.

3. Advantageous effects

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

according to the high-voltage electric field low-temperature plasma cold sterilization system circuit, the output voltage of the power supply module is controllable, the harmonic component in the output SPWM sine pulse width modulation wave is effectively suppressed, the frequency spectrum is expanded, the harmonic current entering the voltage regulation module is stable, the second-stage inductor is connected behind the voltage regulator, the problem that when the voltage of the circuit is regulated and changed, the negative resistance effect is avoided, and the output voltage is stable is solved. The high-voltage electric field low-temperature plasma cold sterilization device comprises a high-voltage electric field low-temperature plasma cold sterilization system circuit, and is reasonable in structural design, simple in principle and convenient to popularize and use.

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 schematic circuit diagram 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.

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 a high-voltage electric field low-temperature plasma cold sterilization system circuit according to the present invention.

A high-voltage electric field low-temperature plasma cold sterilization system circuit comprises a power module 100 for outputting harmonic current, a voltage regulating module 200 for regulating load voltage, current and power, a switch module 300 for regulating the circuit opening and closing state and a transformer power supply module 400 for generating high voltage.

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.

The voltage regulation module 200 is connected between the power module 100 and the load and regulates the voltage, current and power applied to the load. 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.

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.

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.

Example 2

Referring to fig. 3, fig. 3 is a circuit diagram of a high-voltage electric field low-temperature plasma cold sterilization system circuit. In the high-voltage electric field low-temperature plasma cold sterilization system circuit of the present embodiment, the power module 100 includes a single-phase frequency converter 110, the single-phase frequency converter 110 includes two input terminals connected to a single-phase power source (e.g., AC220), an output terminal T1 of the single-phase frequency converter 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 regulation 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. 3 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 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.

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 again 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 outputs are continuous waveforms, and intermittent discharge can be realized after the alternating current contactor 310 and the solid-state relay 320 are adopted, so that intermittent discharge is formed in a time domain, and a pulse waveform is formed.

Referring to fig. 3, 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 both 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.

Preferably, the number of the transformers can be more than 2, and the transformers can be arranged according to requirements.

Example 3

Referring to fig. 4, the basic circuit connection of the high-voltage electric field low-temperature plasma cold sterilization system circuit of the present embodiment is the same as that of embodiment 2, and the improvement is:

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. 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.

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.

Example 4

With reference to fig. 3 and 4, the high-voltage electric field low-temperature plasma cold sterilization system circuit of embodiment 2 or embodiment 3 is adopted, and the working principle of this 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 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.

Example 5

A high-voltage electric field low-temperature plasma cold sterilization device adopts the high-voltage electric field low-temperature plasma cold sterilization system circuit of the embodiment 1, the embodiment 2 or the embodiment 3, and comprises a shell, and the high-voltage electric field low-temperature plasma cold sterilization system is electrically arranged in the shell.

The shell is arranged according to the arrangement of the high-voltage electric field low-temperature plasma cold sterilization system circuit, and can comprise a bottom surface and three side surfaces, and the other side surface is open, so that the circuit is convenient to install and maintain.

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.