A kind of ultra-low frequency high voltage generator driving circuit and working method

Abstract

The invention discloses a driving circuit and working method of an ultra-low frequency high-voltage generator, which belongs to the technical field of power cable testing, and includes a high-voltage generator and a driver; the high-voltage generator includes a booster, a positive half-cycle magnetic bar coil and a negative half-cycle magnetic bar coil; the booster includes a first coil, a second coil and a rectifier filter discharge circuit, and the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil are both connected to the booster by mutual inductance coupling; the driver includes a positive half-cycle driver and a negative half-cycle driver, and the output ends of the positive half-cycle driver and the negative half-cycle driver are electrically connected to the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil respectively; and the input ends of the positive half-cycle driver and the negative half-cycle driver are connected with a rectifier filter circuit. The invention realizes arbitrary waveform high-voltage output and overall miniaturization and lightweight, and meets the requirement that the ultra-low frequency high-voltage generator needs to output multiple waveforms under different test requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of power cable testing, and in particular to an ultra-low frequency high voltage generator driving circuit and a working method. Background Art

[0002] In the detection and maintenance of power systems, high-voltage generators are key equipment for power cable withstand voltage tests and other tasks. The traditional test method using power frequency, due to its frequency characteristics, makes the test instrument often bulky and heavy. With the development of technology, ultra-low frequency high-voltage generators have gradually been used, and their replacement of power frequency has reduced the weight and volume of test instruments to a certain extent. However, even so, ultra-low frequency high-voltage generators of the same capacity under existing technology still have many shortcomings. For example, the common 80kV / 50mA ultra-low frequency test instrument weighs up to 100kg and has a large volume. This bulky characteristic brings great inconvenience to the transportation, installation and on-site operation of the equipment, limiting its application in some specific environments or scenarios that require frequent movement. In order to overcome these problems, a new structure of a laminated high-voltage generator has been proposed, which can reduce the weight of the equipment to about 30kg and greatly reduce the volume.

[0003] However, this new type of laminated high-voltage generator requires a driving circuit that matches it. The existing driving circuit cannot meet the special needs of the laminated high-voltage generator in terms of structure and performance, which is mainly reflected in waveform output, power conversion efficiency and volume. First of all, for the requirement that the ultra-low frequency high-voltage generator needs to output multiple waveforms under different test requirements, the existing driving circuit is difficult to achieve flexible waveform control and output. Secondly, the existing driving circuit cannot achieve efficient power conversion while meeting the ultra-low frequency high-voltage output, resulting in energy waste or failure to meet some test scenarios with high power requirements. In addition, the structure and design of the existing driving circuit itself cannot match the miniaturization and lightweight characteristics of the laminated high-voltage generator, and cannot further improve the portability and applicability of the entire device. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an ultra-low frequency high-voltage generator driving circuit and a working method. The circuit includes a positive half-cycle driver and a negative half-cycle driver, which respectively drive a laminated high-voltage generator to generate positive and negative high voltages, and can obtain arbitrary waveform outputs. It adopts high-frequency operation, has a very simple circuit structure, and is very small in size and weight.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an ultra-low frequency high-voltage generator driving circuit, comprising: a high-voltage generator and a driver;

[0007] The high voltage generator comprises a booster, a positive half-cycle magnetic bar coil and a negative half-cycle magnetic bar coil; the booster comprises a first coil, a second coil and a rectifier filter discharge circuit, and the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil are both connected to the booster in mutual inductive coupling;

[0008] The driver comprises a positive half-cycle driver and a negative half-cycle driver, the output ends of the positive half-cycle driver and the negative half-cycle driver are electrically connected to the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil respectively; and the input ends of the positive half-cycle driver and the negative half-cycle driver are connected to a rectifier and filter circuit.

[0009] As a further technical solution, the booster is a stacked booster. Specifically, each stack of the stacked booster includes a first coil, a second coil, and a rectifier, filter, and discharge circuit; and all stacks are assembled in series.

[0010] As a further technical solution, the positive half-cycle magnetic bar coil is connected to the first coil by mutual inductive coupling; and the negative half-cycle magnetic bar coil is connected to the second coil by mutual inductive coupling.

[0011] As a further technical solution, the outer sides of the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil are sheathed with insulating tubes.

[0012] As a further technical solution, the positive half-cycle driver includes a first DCDC buck circuit, a first filter inductor, a first high-frequency amplitude modulation circuit, a first filter circuit, a first PWM driver and a first square wave driver; the negative half-cycle driver includes a second DCDC buck circuit, a second filter inductor, a second high-frequency amplitude modulation circuit, a second filter circuit, a second PWM driver and a second square wave driver.

[0013] As a further technical solution, the first DCDC step-down circuit includes a first transistor and a second transistor, the first high-frequency amplitude modulation circuit includes a third transistor and a fourth transistor; the first filter circuit includes a first DC blocking capacitor, a second DC blocking capacitor and a first filter capacitor; specifically: the collector of the first transistor is connected to the output end of the rectifier and filter circuit, the emitter of the first transistor is respectively connected to the collector of the second transistor and one end of the first filter inductor, the emitter of the second transistor is grounded, the other end of the first filter inductor is respectively connected to the collector of the third transistor, one end of the first DC blocking capacitor and the positive electrode of the first filter capacitor, the emitter of the third transistor is respectively connected to the collector of the fourth transistor and one end of the positive half-cycle magnetic bar coil, the emitter of the fourth transistor is grounded, the other end of the first DC blocking capacitor is respectively connected to one end of the second DC blocking capacitor and the other end of the positive half-cycle magnetic bar coil, the other end of the second DC blocking capacitor is grounded, and the negative electrode of the first filter capacitor is grounded.

[0014] As a further technical solution, the gates of the first transistor and the second transistor are connected to a first PWM driver, and the gates of the third transistor and the fourth transistor are connected to a first square wave driver.

[0015] As a further technical solution, the second DCDC step-down circuit includes a fifth transistor and a sixth transistor, the second high-frequency amplitude modulation circuit includes a seventh transistor and an eighth transistor; the second filter circuit includes a third DC blocking capacitor, a fourth DC blocking capacitor and a second filter capacitor; specifically: the collector of the fifth transistor is connected to the output end of the rectifier and filter circuit, the emitter of the fifth transistor is respectively connected to the collector of the sixth transistor and one end of the second filter inductor, the emitter of the sixth transistor is grounded, the other end of the second filter inductor is respectively connected to the collector of the seventh transistor, one end of the third DC blocking capacitor and the positive electrode of the second filter capacitor, the emitter of the seventh transistor is respectively connected to the collector of the eighth transistor and one end of the negative half-cycle magnetic bar coil, the emitter of the eighth transistor is grounded, the other end of the third DC blocking capacitor is respectively connected to one end of the fourth DC blocking capacitor and the other end of the negative half-cycle magnetic bar coil, the other end of the fourth DC blocking capacitor is grounded, and the negative electrode of the second filter capacitor is grounded.

[0016] As a further technical solution, the gates of the fifth transistor and the sixth transistor are connected to a second PWM driver, and the gates of the seventh transistor and the eighth transistor are connected to a second square wave driver.

[0017] In a second aspect, the present invention provides a working method of an ultra-low frequency high-voltage generator drive circuit, based on an ultra-low frequency high-voltage generator drive circuit provided in the first aspect, comprising: an AC power supply provides power supply for a positive half-cycle driver and a negative half-cycle driver through a rectifier and filter circuit, in the positive half-cycle driver, a first transistor and a second transistor generate a PWM waveform under the drive of a first PWM driver, and a positive half-cycle waveform is generated through a first filter circuit, a third transistor and a fourth transistor are alternately turned on under the drive of a first square wave driver, and a high-frequency amplitude modulated voltage is generated on the positive half-cycle magnetic bar coil; in the negative half-cycle driver, a fifth transistor and a sixth transistor generate a PWM waveform under the drive of a second PWM driver, and a negative half-cycle waveform is generated through a second filter circuit, a seventh transistor and an eighth transistor are alternately turned on under the drive of a second square wave driver, and a high-frequency amplitude modulated voltage is generated on the negative half-cycle magnetic bar coil; a plurality of stacks are connected in series to generate a high-voltage output of corresponding polarity, and an arbitrary waveform high-voltage output is obtained.

[0018] One or more technical solutions of the present invention have the following beneficial effects:

[0019] (1) The present invention drives the positive and negative half-cycle magnetic bar coils on the positive half-cycle magnetic bar and the negative half-cycle magnetic bar of the high-voltage generator respectively through a positive half-cycle driver and a negative half-cycle driver, and realizes arbitrary waveform high-voltage output through a laminated booster, thereby meeting the requirement that the ultra-low frequency high-voltage generator needs to output multiple waveforms under different test requirements.

[0020] (2) The first stage of each driver in the present invention forms a low-voltage half-cycle waveform, and the second stage converts the low-voltage half-cycle waveform into an amplitude modulated square wave to drive the magnetic rod coil, and then generates a high-voltage output through a laminated high-voltage generator, thereby achieving high-power conversion. This multi-stage conversion method can make full use of electrical energy, while achieving ultra-low-frequency high-voltage output, ensuring the improvement of power conversion efficiency. In practical applications, whether in a laboratory environment or in a field test scenario, it can meet the power requirements of different high-voltage tests, ensuring the accuracy and reliability of the test.

[0021] (3) The driving circuit provided by the present invention can perfectly match the laminated high-voltage generator, achieving overall miniaturization and lightness. Such miniaturization and lightness make the device easier to transport, install and use in various field environments, greatly improving the portability and applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 A circuit diagram of a driving circuit of an ultra-low frequency high voltage generator and a working method of the present invention;

[0024] Figure 2 A driving circuit waveform diagram of an ultra-low frequency high voltage generator and a working method of the present invention;

[0025] Figure 3 A simplified schematic diagram of each stack of an ultra-low frequency high voltage generator and a working method of the present invention;

[0026] Figure 4 The schematic diagram is a principle diagram of a UCC27712 dedicated driver chip in an ultra-low frequency high voltage generator and working method of the present invention.

[0027] Among them: 1 is the positive half-cycle driver; 2 is the negative half-cycle driver; 3 is the stacked booster; 4 is the positive half-cycle magnetic bar coil; 5 is the negative half-cycle magnetic bar coil; Ua is the positive half-cycle low-voltage waveform; Ub is the negative half-cycle low-voltage waveform; Uo is the high-voltage output waveform. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] Embodiment 1

[0030] The present invention provides an ultra-low frequency high voltage generator driving circuit, such as Figure 1 As shown in the circuit diagram of the driving circuit, it includes a high-voltage generator and a driver. The high-voltage generator includes a booster, a positive half-cycle magnetic bar coil 4 and a negative half-cycle magnetic bar coil 5. The positive half-cycle magnetic bar coil 4 and the negative half-cycle magnetic bar coil 5 are both mutually inductively coupled to the booster.

[0031] The booster is a laminated booster 3, and the structure of each laminate is as follows: Figure 3 As shown, it includes two parts, a and b, each of which contains its own coil, rectifier filter and discharge circuit R. When the coil is driven by the mutual inductance coupling of the magnetic bar coil, it will generate an output voltage after rectification and filtering. The coil of part a is the first coil, and the coil of part b is the second coil. Since the output voltages of parts a and b are connected in series in reverse, when the first coil is driven by the positive half-cycle magnetic bar coil 4, part a will generate a positive voltage output, and when the second coil is driven by the negative half-cycle magnetic bar coil 5, part b will generate a negative voltage output. The positive voltage generated by part a will eventually form a loop through the discharge circuit R of part b, and the negative voltage generated by b will eventually form a loop through the discharge circuit R of part a.

[0032] When several stacks are connected in series, in the positive half cycle, all stacks a part ( ~ ) is simultaneously driven by the mutual inductance coupling of the positive half-cycle magnetic bar coil 4 to produce a positive half-cycle high voltage output. In the negative half cycle, all the laminated b parts ( ~ ) is simultaneously driven by the mutual inductance coupling of the negative half-cycle magnetic bar coil 5 to generate a negative half-cycle high voltage output.

[0033] In this embodiment, the outer sides of the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil are sheathed with insulating tubes to isolate the high voltage.

[0034] In this embodiment, if Figure 1As shown in the circuit diagram of the driving circuit, the driver includes a positive half-cycle driver 1 and a negative half-cycle driver 2, the output ends of the positive half-cycle driver 1 and the negative half-cycle driver 2 are electrically connected to the positive half-cycle magnetic bar coil 4 and the negative half-cycle magnetic bar coil 5 respectively, and the input ends of the positive half-cycle driver 1 and the negative half-cycle driver 2 are connected to the rectifier and filter circuit. Specifically: the positive half-cycle driver 1 includes a first DCDC step-down circuit, a first filter inductor L, a first high-frequency amplitude modulation circuit, a first filter circuit, a first PWM driver and a first square wave driver, wherein the first DCDC step-down circuit includes a first transistor Q1 and a second transistor Q2, and the first high-frequency amplitude modulation circuit includes a third transistor Q3 and a fourth transistor Q4; the first filter circuit includes a first DC blocking capacitor C1, a second DC blocking capacitor C2 and a first filter capacitor C3, and the specific circuit structure is: the collector of the first transistor is connected to the output end of the rectifier and filter circuit, and the emitter of the first transistor is respectively The collector of the second transistor and one end of the first filter inductor are connected, the emitter of the second transistor is grounded, the other end of the first filter inductor is respectively connected to the collector of the third transistor, one end of the first DC blocking capacitor and the positive electrode of the first filter capacitor, the emitter of the third transistor is respectively connected to the collector of the fourth transistor and one end of the positive half-cycle magnetic bar coil to achieve positive half-cycle high voltage output, the emitter of the fourth transistor is grounded, the other end of the first DC blocking capacitor is respectively connected to one end of the second DC blocking capacitor and the other end of the positive half-cycle magnetic bar coil, the other end of the second DC blocking capacitor is grounded, and the negative electrode of the first filter capacitor is grounded. The gates of the first transistor and the second transistor are connected to the first PWM driver, and the gates of the third transistor and the fourth transistor are connected to the first square wave driver. The negative half-cycle driver has the same structure as the positive half-cycle driver. Specifically, the negative half-cycle driver includes a second DCDC step-down circuit, a second filter inductor, a second high-frequency amplitude modulation circuit, a second filter circuit, a second PWM driver and a second square wave driver, wherein the second DCDC step-down circuit includes a fifth transistor and a sixth transistor, and the second high-frequency amplitude modulation circuit includes a seventh transistor and an eighth transistor; the second filter circuit includes a third DC blocking capacitor, a fourth DC blocking capacitor and a second filter capacitor. The specific circuit structure is: the collector of the fifth transistor is connected to the output end of the rectifier and filter circuit, the emitter of the fifth transistor is respectively connected to the collector of the sixth transistor and one end of the second filter inductor, the emitter of the sixth transistor is grounded, the other end of the second filter inductor is respectively connected to the collector of the seventh transistor, one end of the third DC blocking capacitor and the positive electrode of the second filter capacitor, the emitter of the seventh transistor is respectively connected to the collector of the eighth transistor and one end of the negative half-cycle magnetic bar coil, the emitter of the eighth transistor is grounded, the other end of the third DC blocking capacitor is respectively connected to one end of the fourth DC blocking capacitor and the other end of the negative half-cycle magnetic bar coil, the other end of the fourth DC blocking capacitor is grounded, and the negative electrode of the second filter capacitor is grounded.Among them, the gates of the fifth transistor and the sixth transistor are connected to the second PWM driver, and the gates of the seventh transistor and the eighth transistor are connected to the second square wave driver. This multi-stage conversion method can make full use of electrical energy, and ensure the improvement of power conversion efficiency while achieving ultra-low frequency high voltage output. In practical applications, whether in a laboratory environment or in a field test scenario, it can meet the power requirements of different high-voltage tests, ensuring the accuracy and reliability of the test.

[0035] In this embodiment, the first PWM driver, the first square wave driver, the second PWM driver and the second square wave driver use a dedicated driver chip UCC27712, such as Figure 4 As shown,

[0036] In this embodiment, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are NMOS tubes SPW47N60C3, and IGBT single tubes with reverse diodes can also be selected, and IGBT half-bridge modules can also be used. The first filter inductor and the second filter inductor are 2mH / 20A inductors, C1 and C2 are 10uF / 630V film capacitors, and C3 is a 68uF / 400V electrolytic capacitor. C3 uses an electrolytic capacitor to reduce the volume of the filter capacitor. If the capacitance of C1~C3 is too large, it will affect the response speed of the low-voltage waveform of the driver. If the capacitance is too small, it will resonate with the leakage inductance of the magnetic bar coil and reduce the coupling efficiency.

[0037] In this example, considering that the circuit will generate heat when working at high frequency, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor and the eighth transistor are installed on the radiator, which is simple to dissipate heat and has good heat dissipation performance. This good heat dissipation performance ensures the stability and reliability of the circuit, avoids the degradation or damage of component performance due to excessive temperature, thereby extending the service life of the circuit and ensuring that the entire ultra-low frequency high voltage generator system can work continuously and stably. In addition, all transistors work at the same clock frequency, which is set at 10~20kHz.

[0038] The principle of the first PWM driver and the second PWM driver is the same, such as Figure 4As shown, taking the first PWM driver as an example, the first PWM driver provides a 20kHz driving pulse with a variable duty cycle to the first transistor Q1 and the second transistor Q2 through its UCC27712 chip: when the duty cycle is 0, the first transistor Q1 is turned off and the second transistor Q2 is turned on, and Ua is 0 at this time; when the duty cycle is 50%, the first transistor Q1 and the second transistor Q2 are turned on for 50% of the time, and the average voltage Ua=Udc / 2 is obtained after filtering by the first filtering inductor L, the first DC blocking capacitor C1, the second DC blocking capacitor C2, and the third DC blocking capacitor C3; when the duty cycle is 100% (considering the influence of the dead zone, it can actually only reach about 95%), the first transistor Q1 is turned on and the second transistor Q2 is turned off, and Ua=Udc at this time. It can be seen that as long as the duty cycle is adjusted within the range of 0%~100%, Ua will change linearly between 0~Udc, which is the working principle of the first PWM driver and the second PWM driver (Pulse Width Modulation).

[0039] The principles of the first square wave driver and the second square wave driver are the same. Taking the first square wave driver as an example, the first square wave driver only needs to provide a 20kHz square wave with a duty cycle of 50% through the input end of its UCC27712 chip, and the UCC27712 chip is used to control Q3 / Q4 to be alternately turned on, wherein C1 and C2 are DC blocking capacitors, and their center points are Ua / 2 DC voltage connected to one end of the magnetic bar coil, and the center point of Q3 / Q4 is connected to the other end of the magnetic bar coil. When Q3 is turned on, the center point voltage is Ua, and when Q4 is turned on, the center point voltage is 0, so an amplitude modulated square wave voltage of + / -Ua / 2 is provided to the magnetic bar coil.

[0040] For example, when a 0.1Hz sine wave needs to be generated, the first PWM driver of the positive half-cycle driver controls Q1 and Q2, generates a PWM voltage Upa corresponding to the sine wave within 0~5 seconds, generates a positive half-cycle low-voltage sine wave voltage Ua (Ub=0 at this time) through the filter circuit, generates an amplitude modulated square wave through Q3 and Q4, drives the positive half-cycle magnetic bar coil (a1~an) of the laminated high-voltage generator, and obtains the positive half cycle of the high-voltage sine wave after rectification and filtering. The second PWM of the negative half-cycle driver generates Ppb corresponding to the negative half-cycle sine wave voltage within 5~10 seconds as required, generates a negative half-cycle low-voltage sine wave voltage Ub (Ua=0 at this time) through the filter circuit, and Ub is driven after amplitude modulation to drive the negative half-cycle magnetic bar coil (b1~bn) of the laminated high-voltage generator, thereby obtaining the negative half cycle of the high-voltage sine wave, and finally generating a high-voltage sine wave.

[0041] The specific working principle of the ultra-low frequency high voltage generator driving circuit mentioned in this embodiment is as follows:

[0042] Taking the positive half-cycle driver as an example, 220V AC is input to the rectifier filter circuit, and the output Udc is 310V DC voltage. The first transistor Q1 and the second transistor Q2 generate PWM waveforms under the drive of the first PWM driver. The positive half-cycle waveform Ua is generated through the filter circuit composed of the first filter inductor L, the first DC blocking capacitor C1, the second DC blocking capacitor C2 and the first filter capacitor C3. The voltage range of Ua is 0~Udc. The third transistor Q3 and the fourth transistor Q4 are driven by the first square wave driver. Q3 / Q4 are alternately turned on, so a high-frequency amplitude modulation voltage is generated on the positive half-cycle magnetic bar coil. Ignoring the influence of leakage magnetic flux and C1 / C2 capacitive reactance, the peak-to-peak value of the square wave voltage is equal to Ua. The voltage is induced to each stack of the stacked high-voltage generator. One stack can generate a voltage of + / -2kV. Several stacks are connected in series to generate high-voltage outputs of corresponding polarities. The two drivers work alternately to obtain arbitrary waveform high-voltage outputs. The working principles of the positive half-cycle driver and the negative half-cycle driver are the same.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultra-low frequency high voltage generator drive circuit, characterized in that: include: A driver for driving a high voltage generator to output positive and negative high voltage; The high voltage generator comprises a booster, a positive half-cycle magnetic bar coil and a negative half-cycle magnetic bar coil; the booster comprises a first coil, a second coil and a rectifier filter discharge circuit, and the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil are both connected to the booster in mutual inductive coupling; The driver comprises a positive half-cycle driver and a negative half-cycle driver, the output ends of the positive half-cycle driver and the negative half-cycle driver are electrically connected to the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil respectively; and the input ends of the positive half-cycle driver and the negative half-cycle driver are connected to a rectifier filter circuit; The positive half-cycle driver comprises a first DCDC buck circuit, a first filter inductor, a first high-frequency amplitude modulation circuit, a first filter circuit, a first PWM driver and a first square wave driver, wherein the first DCDC buck circuit is connected to the first PWM driver, and the first high-frequency amplitude modulation circuit is connected to the first square wave driver; the negative half-cycle driver comprises a second DCDC buck circuit, a second filter inductor, a second high-frequency amplitude modulation circuit, a second filter circuit, a second PWM driver and a second square wave driver, wherein the second DCDC buck circuit is connected to the second PWM driver, and the second high-frequency amplitude modulation circuit is connected to the second square wave driver; The first DCDC step-down circuit includes a first transistor and a second transistor, the first high-frequency amplitude modulation circuit includes a third transistor and a fourth transistor; the first filter circuit includes a first DC blocking capacitor, a second DC blocking capacitor and a first filter capacitor; specifically: the collector of the first transistor is connected to the output end of the rectifier and filter circuit, the emitter of the first transistor is respectively connected to the collector of the second transistor and one end of the first filter inductor, the emitter of the second transistor is grounded, the other end of the first filter inductor is respectively connected to the collector of the third transistor, one end of the first DC blocking capacitor and the positive electrode of the first filter capacitor, the emitter of the third transistor is respectively connected to the collector of the fourth transistor and one end of the positive half-cycle magnetic bar coil, the emitter of the fourth transistor is grounded, the other end of the first DC blocking capacitor is respectively connected to one end of the second DC blocking capacitor and the other end of the positive half-cycle magnetic bar coil, the other end of the second DC blocking capacitor is grounded, and the negative electrode of the first filter capacitor is grounded; the gates of the first transistor and the second transistor are connected to the first PWM driver, and the gates of the third transistor and the fourth transistor are connected to the first square wave driver; The second DCDC step-down circuit includes a fifth transistor and a sixth transistor, and the second high-frequency amplitude modulation circuit includes a seventh transistor and an eighth transistor; the second filter circuit includes a third DC blocking capacitor, a fourth DC blocking capacitor and a second filter capacitor; specifically: the collector of the fifth transistor is connected to the output end of the rectifier and filter circuit, the emitter of the fifth transistor is respectively connected to the collector of the sixth transistor and one end of the second filter inductor, the emitter of the sixth transistor is grounded, the other end of the second filter inductor is respectively connected to the collector of the seventh transistor, one end of the third DC blocking capacitor and the positive electrode of the second filter capacitor, the emitter of the seventh transistor is respectively connected to the collector of the eighth transistor and one end of the negative half-cycle magnetic bar coil, the emitter of the eighth transistor is grounded, the other end of the third DC blocking capacitor is respectively connected to one end of the fourth DC blocking capacitor and the other end of the negative half-cycle magnetic bar coil, the other end of the fourth DC blocking capacitor is grounded, and the negative electrode of the second filter capacitor is grounded; the gates of the fifth and sixth transistors are connected to the second PWM driver, and the gates of the seventh and eighth transistors are connected to the second square wave driver.

2. The ultra-low frequency high voltage generator driving circuit according to claim 1, characterized in that: The booster is a stacked booster. Specifically, each stack of the stacked booster includes a first coil, a second coil, and a rectifier, filter, and discharge circuit; and all stacks are assembled in series.

3. The ultra-low frequency high voltage generator driving circuit according to claim 1, characterized in that: The positive half-cycle magnetic bar coil is connected to the first coil by mutual inductive coupling; the negative half-cycle magnetic bar coil is connected to the second coil by mutual inductive coupling.

4. The ultra-low frequency high voltage generator driving circuit according to claim 3, characterized in that: The outer sides of the positive half-cycle magnetic bar coil and the negative half-cycle magnetic bar coil are sleeved with insulating tubes.

5. A working method of an ultra-low frequency high-voltage generator drive circuit, based on an ultra-low frequency high-voltage generator drive circuit according to any one of claims 1 to 4, comprising: an AC power supply provides power supply for a positive half-cycle driver and a negative half-cycle driver through a rectifier and filter circuit, in the positive half-cycle driver, a first transistor and a second transistor generate a PWM waveform under the drive of a first PWM driver, a positive half-cycle waveform is generated through a first filter circuit, a third transistor and a fourth transistor are alternately turned on under the drive of a first square wave driver, and a high-frequency amplitude modulated voltage is generated on the positive half-cycle magnetic bar coil; in the negative half-cycle driver, a fifth transistor and a sixth transistor generate a PWM waveform under the drive of a second PWM driver, a negative half-cycle waveform is generated through a second filter circuit, a seventh transistor and an eighth transistor are alternately turned on under the drive of a second square wave driver, and a high-frequency amplitude modulated voltage is generated on the negative half-cycle magnetic bar coil; a plurality of stacks are connected in series to generate a high-voltage output of corresponding polarity, and an arbitrary waveform high-voltage output is obtained.

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