High-voltage pulse generation circuit, working method and application based on pre-boost structure

Abstract

The present invention discloses a high-voltage pulse generation circuit, operating method, and application based on a pre-boost structure, belonging to the field of high-voltage pulse power supplies. The circuit comprises a DC power supply, a pre-Sepic boost circuit, and a pulse forming module connected in sequence. The pulse forming module comprises a plurality of cascaded Marx high-voltage pulse circuits, thereby utilizing the pre-Sepic boost circuit to boost the DC power supply, and transmitting the boosted electrical energy to the pulse forming module. The parallel charge pump pressure and series discharge of the Marx high-voltage pulse circuit are utilized to form a high-voltage pulse on the load. By utilizing the above-mentioned high-voltage pulse generation circuit, operating method, and application based on the pre-boost structure, the traditional Marx circuit is optimized through a Sepic boost converter, thereby achieving the goal of increasing voltage gain, reducing the number of components and cost, while reducing component voltage stress, and improving system efficiency, power density, reliability, and circuit life.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage pulse power supplies, and in particular to a high-voltage pulse generating circuit based on a pre-boost structure, a working method and an application thereof. Background Art

[0002] As a classic all-solid-state power pulse generator, the Marx circuit mainly realizes the parallel charging and series discharging process of capacitors by controlling the on-off of the switch tube, thereby generating high-voltage pulses on the load.

[0003] With the rapid development of semiconductor technology, Marx circuits, with their compact size and stable output waveform, have been widely used in fields such as biomedicine, industrial waste treatment, electrostatic precipitation, microwave weapons, and plasma research. However, with the continuous advancement of various application fields, higher performance requirements are being placed on pulse power supplies, especially in terms of high voltage gain, miniaturization, and high power density.

[0004] Currently, there are two common approaches to meeting the high voltage gain requirements of pulse power supplies. One is to increase the number of charge and discharge units in the Marx generator. Theoretically, this should improve voltage gain. However, in practice, as the number of Marx circuit stages increases, the number of switching devices in the circuit also increases. This not only significantly increases overall switching losses but also rapidly reduces circuit efficiency. Furthermore, more devices mean a larger circuit size and higher costs. These factors have severely restricted the further application of Marx circuits in the high-voltage pulse field.

[0005] Another approach is to increase the voltage level of the capacitor in the Marx generator's charge and discharge unit to improve the overall circuit voltage gain. This approach can, to a certain extent, reduce circuit size, reduce switching transistor power loss, and lower costs. However, this approach also faces some technical challenges in practice, such as how to safely and effectively increase the capacitor voltage, and the impact of the increase on circuit stability and reliability. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-voltage pulse generation circuit, a working method and an application based on a pre-boost structure to solve the above technical problems.

[0007] To achieve the above objectives, the present invention provides a high-voltage pulse generation circuit based on a pre-boost structure, comprising a DC power supply, a pre-Sepic boost circuit and a pulse forming module connected in sequence, wherein the pulse forming module includes multiple cascaded Marx high-voltage pulse circuits, thereby realizing the use of the pre-Sepic boost circuit to boost the DC power supply and transmit the boosted electric energy to the pulse forming module, and utilizing the parallel charge pump pressure and series discharge of the Marx high-voltage pulse circuit to form a high-voltage pulse on the load.

[0008] Preferably, the pre-Sepic boost circuit includes an inductor ,inductance ,capacitance and switch tube ,inductance One end of the DC power supply The positive electrode is connected to the other end of the capacitor and inductance With DC power supply The negative pole is connected, and the inductor and capacitors There is a switch tube between The drain of the switch tube The source is connected to the DC power supply The negative pole and inductor between.

[0009] Preferably, the pulse forming module includes A cascaded Marx high voltage pulse circuit, Level Marx high voltage pulse circuit including capacitor ,diode , thyristor and switch tube , and ;

[0010] Thyristor The anode of the capacitor is connected to and inductance Between thyristors The anode capacitor With diode The anode of the diode is connected to The cathode of the inductor is connected to and switch tube between the cathodes of the diodes, and ,diode ,diode To diode Connect in series in the same circuit in the same phase;

[0011] Switching tube The drain of the thyristor is connected to and capacitors Between the switch tube The source of the diode is connected to cathode and diode between.

[0012] Preferably, the switch tube For IGBT or MOSFET, switch tube It is IGBT or MOSFET.

[0013] The working method of the high-voltage pulse generating circuit based on the pre-boost structure includes a cyclic execution of an inductor charging preparation stage, a capacitor charging and voltage pumping stage, a capacitor supplementary charging stage and a high-voltage pulse output stage;

[0014] The steps in the inductor charging preparation phase are as follows: Turn on the switch tube , while turning off the switch tube and thyristors , at this time, the diode Cut-off, DC power supply Through the switch tube Directional Inductance Charging, capacitor Through the switch tube Directional Inductance Charge;

[0015] The steps of capacitor charging and voltage pumping are as follows: Turn off the switch tube and switch tube , turn on the control thyristor , at this time, the diode Conductivity, DC power supply and inductors that store energy At the same time, the capacitor Charging to increase capacitance voltage and an inductor that stores energy , inductors that store energy and DC power supply At the same time, the capacitor Charging to achieve voltage pumping until the capacitor The voltage reaches the maximum capacitor voltage , at this time the thyristor The anode current is lower than the holding current, the thyristor Shutdown;

[0016] The steps of the capacitor supplementary charging stage are as follows: Turn off the switch tube , switch tube and thyristors , at this time, the diode Cut-off, DC power supply Through the inductor ,inductance Capacitor Charging to further increase capacitance Voltage;

[0017] The steps of high voltage pulse output stage are as follows: Turn on the switch tube and switch tube , turn off the thyristor , at this time, the diode Cut-off, DC power supply Directional Inductance Charging, capacitor Through the switch tube Directional Inductance Charging, while the capacitor Through the switch tube They are connected in series and discharge to the load, thus forming a high voltage pulse on the load.

[0018] The high-voltage pulse generation circuit based on the pre-boost structure is used in electrostatic dust removal, wastewater treatment, pulse electric field sterilization or biological tissue ablation.

[0019] Therefore, the present invention adopts the above-mentioned high-voltage pulse generation circuit based on the pre-boost structure, the working method and the application, which have the following beneficial effects:

[0020] 1. High voltage gain: The pre-Sepic boost circuit is used to boost the capacitor of the Marx high-voltage pulse circuit. Compared with the traditional Marx circuit, the voltage gain can be increased several times without changing the number of stages, meeting the high voltage requirements (the Marx high-voltage pulse circuit does not need to increase the number of circuit stages while obtaining high voltage gain, and obtains high-voltage pulse output based on the consumption of fewer power electronic switching devices);

[0021] 2. Reduce costs: The number of power electronic switching devices can be significantly reduced, reducing the cost of pulse generators. At the same time, due to the reduced voltage stress of the devices, devices with lower withstand voltage and lower cost can be selected, further saving costs.

[0022] 3. Improve system performance: reduce device voltage stress, avoid voltage resistance problems of power electronic switching devices, and improve pulse circuit reliability; ensure that devices work under low voltage stress for a long time, extend the life of the overall circuit; improve system efficiency and power density, and reduce the size of the pulse power supply.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a high-voltage pulse generating circuit based on a pre-boost structure according to the present invention;

[0025] Figure 2 The diagrams are circuit structure comparisons of the simulation experiments described in the present invention, wherein (a) is a schematic diagram of a conventional 4-level Marx pulse circuit, and (b) is a schematic diagram of a 4-level Marx high-voltage pulse circuit described in the present invention;

[0026] Figure 3 This is the PWM control signal timing diagram of the switching device in the simulation experiment of the present invention, where (a) is the switching tube PWM control signal timing diagram, (b) is the thyristor PWM control signal timing diagram, (c) is the switch tube PWM control signal timing diagram;

[0027] Figure 4 The working principle diagram of the simulation experiment described in the present invention, wherein (a) is the principle diagram of the inductor charging preparation stage, (b) is the principle diagram of the capacitor charging and voltage pumping stage, (c) is the principle diagram of the capacitor supplementary charging stage, and (d) is the principle diagram of the high-voltage pulse output stage;

[0028] Figure 5 The simulated current and voltage waveforms of the traditional 4-level Marx pulse circuit of the simulation experiment described in the present invention are as follows;

[0029] Figure 6 This is a simulated current and voltage waveform diagram of the 4-level Marx high-voltage pulse circuit of the present invention in the simulation experiment of the present invention;

[0030] Figure 7 This is a comparison diagram of output pulses of the 4-level Marx high-voltage pulse circuit of the present invention and the traditional 4-level Marx pulse circuit in the simulation experiment of the present invention;

[0031] Figure 8 This is a diagram of the voltage stress borne by the switching device in the simulation experiment of the present invention, where (a) is the diode The voltage stress diagram is shown in Figure 2. (b) is the switching tube The voltage stress diagram is shown in Figure 2. (c) shows the switching tube The voltage stress diagram is shown in Figure 2. (d) is the voltage stress of the thyristor. Voltage stress diagram. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0033] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the high-voltage pulse generating circuit based on the pre-boost structure includes a DC power supply, a pre-Sepic boost circuit and a pulse forming module connected in sequence, wherein the pulse forming module includes multiple cascaded Marx high-voltage pulse circuits, thereby realizing the use of the pre-Sepic boost circuit to boost the DC power supply and transmit the boosted electric energy to the pulse forming module, and forming a high-voltage pulse on the load by utilizing the parallel charge pump pressure and series discharge of the Marx high-voltage pulse circuit.

[0036] Specifically, the pre-Sepic boost circuit includes an inductor ,inductance ,capacitance and switch tube ,inductance One end of the DC power supply The positive electrode is connected to the other end of the capacitor and inductance With DC power supply The negative pole is connected, and the inductor and capacitors There is a switch tube between The drain of the switch tube The source is connected to the DC power supply The negative pole and inductor between.

[0037] The pulse shaping module includes A cascaded Marx high voltage pulse circuit, Level Marx high voltage pulse circuit including capacitor ,diode , thyristor and switch tube , and thyristor The anode of the capacitor is connected to and inductance Between thyristors The anode capacitor With diode The anode of the diode is connected to The cathode of the inductor is connected to and switch tube between the cathodes of the diodes, and ,diode ,diode To diode The same phase is connected in series in the same circuit; the switch tube The drain of the thyristor is connected to and capacitors Between the switch tube The source of the diode is connected to cathode and diode between.

[0038] Switching tube For IGBT or MOSFET, switch tube It is an IGBT or MOSFET. It should be noted that the selection of the above devices is only for example and should not be understood as a limitation to this application.

[0039] The working method of the high-voltage pulse generating circuit based on the pre-boost structure includes a cyclic execution of an inductor charging preparation stage, a capacitor charging and voltage pumping stage, a capacitor supplementary charging stage and a high-voltage pulse output stage;

[0040] The steps in the inductor charging preparation phase are as follows: Turn on the switch tube , while turning off the switch tube and thyristors , at this time, the diode Cut-off, DC power supply Through the switch tube Directional Inductance Charging, capacitor Through the switch tube Directional Inductance Charge;

[0041] The steps of capacitor charging and voltage pumping are as follows: Turn off the switch tube and switch tube , turn on the control thyristor , at this time, the diode Conductivity, DC power supply and inductors that store energy At the same time, the capacitor Charging to increase capacitance Voltage and energy storage inductor , inductors that store energy and DC power supply At the same time, the capacitor Charging to achieve voltage pumping until the capacitor The voltage reaches the maximum capacitor voltage , at this time the thyristor The anode current is lower than the holding current, the thyristor Shutdown;

[0042] The steps of the capacitor supplementary charging stage are as follows: Turn off the switch tube , switch tube and thyristors , at this time, the diode Cut-off, DC power supply Through the inductor ,inductance Capacitor Charging to further increase capacitance Voltage;

[0043] The steps of high voltage pulse output stage are as follows: Turn on the switch tube and switch tube , turn off the thyristor , at this time, the diode Cut-off, DC power supply Directional Inductance Charging, capacitor Through the switch tube Directional Inductance Charging, while the capacitor Through the switch tube They are connected in series and discharge to the load, thus forming a high voltage pulse on the load.

[0044] Simulation experiment

[0045] like Figure 2-Figure 7 As shown, the simulation parameters are set as follows: circuit level 4, DC input power supply voltage , output pulse voltage , output pulse frequency , output pulse width , output pulse instantaneous power The traditional 4-level Marx pulse circuit is used as a comparative example, and the results are as follows Figure 5As shown in the figure, it can be seen that when the input voltage and output pulse width of the traditional 4-level Marx pulse circuit and the 4-level Marx high-voltage pulse circuit of the present invention are the same, the capacitor voltage and the overall output pulse voltage of the 4-level Marx high-voltage pulse circuit of the present invention are higher than those of the traditional 4-level Marx pulse circuit. In addition, the voltage gain of the present invention is significantly higher than that of the traditional 4-level Marx pulse circuit.

[0046] like Figure 8 As shown, it can be seen that the switching device (diode , switch tube , switch tube and thyristors ) are not subject to output pulse high voltage.

[0047] The high-voltage pulse generation circuit based on the pre-boost structure is used in electrostatic dust removal, wastewater treatment, pulse electric field sterilization or biological tissue ablation.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-voltage pulse generating circuit based on a pre-boost structure, characterized in that: The system comprises a DC power supply, a pre-Sepic boost circuit and a pulse forming module connected in sequence, wherein the pulse forming module comprises a plurality of cascaded Marx high-voltage pulse circuits, thereby achieving the goal of boosting the DC power supply by the pre-Sepic boost circuit and transmitting the boosted electric energy to the pulse forming module, and forming a high-voltage pulse on the load by utilizing the parallel charge pump pressure and series discharge of the Marx high-voltage pulse circuit; Pre-sepic boost circuit including inductor ,inductance ,capacitance and switch tube ,inductance One end of the DC power supply The positive electrode is connected to the other end of the capacitor and inductance With DC power supply The negative pole is connected, and the inductor and capacitors There is a switch tube between The drain of the switch tube The source is connected to the DC power supply The negative pole and inductor between; The pulse shaping module includes A cascaded Marx high voltage pulse circuit, Level Marx high voltage pulse circuit including capacitor ,diode , thyristor and switch tube , and ; Thyristor The anode of the capacitor is connected to and inductance Between thyristors The anode capacitor With diode The anode of the diode is connected to The cathode of the inductor is connected to and switch tube between the cathodes of the diodes, and ,diode ,diode To diode Connect in series in the same circuit in the same phase; Switching tube The drain of the thyristor is connected to and capacitors Between the switch tube The source of the diode is connected to cathode and diode between.

2. The high-voltage pulse generating circuit based on the pre-boost structure according to claim 1, characterized in that: Switching tube For IGBT or MOSFET, switch tube It is IGBT or MOSFET.

3. An operating method of a high-voltage pulse generating circuit based on a pre-boost structure according to claim 1 or 2, characterized in that: It includes the cyclic execution of the inductor charging preparation stage, the capacitor charging and voltage pumping stage, the capacitor supplementary charging stage and the high-voltage pulse output stage; The steps in the inductor charging preparation phase are as follows: Turn on the switch tube , while turning off the switch tube and thyristors , at this time, the diode Cut-off, DC power supply Through the switch tube Directional Inductance Charging, capacitor Through the switch tube Directional Inductance Charge; The steps of capacitor charging and voltage pumping are as follows: Turn off the switch tube and switch tube , turn on the control thyristor , at this time, the diode Conductivity, DC power supply and inductors that store energy At the same time, the capacitor Charging to increase capacitance voltage and an inductor that stores energy , inductors that store energy and DC power supply At the same time, the capacitor Charging to achieve voltage pumping until the capacitor The voltage reaches the maximum capacitor voltage , at this time the thyristor The anode current is lower than the holding current, the thyristor Shutdown; The steps of the capacitor supplementary charging stage are as follows: Turn off the switch tube , switch tube and thyristors , at this time, the diode Cut-off, DC power supply Through the inductor ,inductance Capacitor Charging to further increase capacitance Voltage; The steps of high voltage pulse output stage are as follows: Turn on the switch tube and switch tube , turn off the thyristor , at this time, the diode Cut-off, DC power supply Directional Inductance Charging, capacitor Through the switch tube Directional Inductance Charging, while the capacitor Through the switch tube They are connected in series and discharge to the load, thus forming a high voltage pulse on the load.

4. Application of the high-voltage pulse generating circuit based on the pre-boost structure described in claim 1 or 2 in electrostatic dust removal, wastewater treatment, pulse electric field sterilization or biological tissue ablation.

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