High-temperature-resistant controllable high-voltage power supply circuit, working method and application

Abstract

The invention discloses a high-temperature-resistant controllable high-voltage power supply circuit, a working method and application. According to the high-temperature-resistant controllable high-voltage power supply circuit, a reference power supply circuit provides reference voltage, and a low-voltage driving circuit is responsible for adjusting a low-voltage control signal and a high-voltage feedback signal and outputting a low-voltage alternating-current signal; the booster circuit boosts the low-voltage AC signal output by the low-voltage driving circuit to a high-voltage AC signal; the filter shaping circuit filters and shapes the high-voltage alternating-current signal output by the booster circuit into a high-voltage direct-current signal; the high-voltage feedback circuit outputs the high-voltage direct-current signal from the filter shaping circuit to the low-voltage driving circuit as a high-voltage feedback signal; the output range of a high-voltage power supply is controlled through a low-voltage direct-current power supply signal, high-voltage output can be effectively adjusted according to environmental changes, it is guaranteed that a photomultiplier works in a lawn area range, and the working requirement of the photomultiplier is met; the circuit is simple in structure and principle, stable and reliable in work and good in popularization and application value.

Description

Technical Field

[0001] The present invention belongs to the technical field of radioactive logging, and particularly relates to a high-temperature-resistant controllable high-voltage power supply circuit, a working method and an application thereof. Background Art

[0002] At present, the research and development and supporting projects of fast logging equipment have formed high-performance one-trip logging series technical equipment with "high precision, high integration, and high resolution", created "excellent" logging equipment that is mature, applicable, efficient, and economical, upgraded the supporting of main logging equipment, and assisted oilfield development. Among them, radioactive logging uses the interaction between radioactive nuclides and formations, and uses detectors to detect the nuclear rays after passing through the formations. The rays will have different effects when passing through different formations. By using specific methods, the relationship between the ray intensity and the changes in formation physical parameters is calculated to determine the formation parameters. Radioactive logging mainly includes logging methods such as gamma, litho-density, and neutron. They can identify oil and gas layers, divide lithology, determine density, etc., provide data support for logging interpretation, and are an important part of the full-house instrument string. And a high-voltage power supply with high temperature resistance and small volume is one of the key technologies of radioactive instruments.

[0003] The high-temperature-resistant controllable high-voltage power supply is obtained by low-voltage power supply and low-voltage power supply controlling the high-voltage power supply circuit. In radioactive logging, the ray detectors generally used are crystal detectors. The crystal detectors require photomultiplier tubes to convert the crystal scintillation signals into electrical signals, and the photomultiplier tubes require a high-voltage power supply of kilovolts to work. In addition, the He3 detector for detecting neutrons also needs to be powered by a high-voltage power supply of more than 1,000 volts. The photomultiplier tube and the He3 detector have a flat region during operation. In order to make the measurement stable and reliable, it is necessary to ensure that the multiplier tube works within the flat region. This requires that the high-voltage power supply for the nuclear signal detector must be adjustable. When the environment changes, the multiplier tube can be adjusted to work in the flat region by adjusting the high-voltage power supply. The current controllable high-voltage power supply cannot meet the above requirements. Summary of the Invention

[0004] In order to overcome the above technical defects, the present invention provides a high-temperature-resistant controllable high-voltage power supply circuit, a working method and an application thereof, which can solve the technical problem that it is difficult to effectively regulate the output high voltage of the existing controllable high-voltage power supply, resulting in the inability to meet the working requirements of the photomultiplier tube.

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

[0006] A high-temperature-resistant controllable high-voltage power supply circuit includes a reference power supply circuit, a low-voltage drive circuit, a boost circuit, a filter shaping circuit, and a high-voltage feedback circuit;

[0007] The reference power supply circuit is used to provide a reference voltage for the low-voltage drive circuit;

[0008] The low-voltage driving circuit is used to adjust and output a low-voltage alternating-current signal according to the input low-voltage control signal and high-voltage feedback signal, so that the output high-voltage power supply is stabilized within a preset range;

[0009] The boost circuit is used to boost the low-voltage alternating-current signal output by the low-voltage driving circuit to a high-voltage alternating-current signal;

[0010] The filtering and shaping circuit is used to filter and shape the high-voltage alternating-current signal output by the boost circuit into a high-voltage direct-current signal;

[0011] The high-voltage feedback circuit is used to output the high-voltage direct-current signal from the filtering and shaping circuit as a high-voltage feedback signal to the low-voltage driving circuit.

[0012] Further, the reference power supply circuit uses power supply U5, and power supply U5 outputs a reference voltage of 5V to operational amplifier U6B, and the output end of operational amplifier U6B is connected to the low-voltage driving circuit.

[0013] Further, the low-voltage driving circuit includes operational amplifier U6A;

[0014] The input ends of operational amplifier U6A are respectively connected to the high-voltage feedback circuit and the low-voltage control circuit. One path of the output end of operational amplifier U6A passes through capacitor C13 and resistor R37 and is connected to transistor Q7 of the boost circuit; the other path is connected to the base of transistor Q3, passes through resistor R21 and resistor R22 and is connected to NAND gate U4C. NAND gate U4C is successively connected with NAND gate U4B and NAND gate U4D, and NAND gate U4D is connected to the boost circuit.

[0015] Further, a resistor R17 is connected between NAND gate U4B and NAND gate U4D.

[0016] Further, the boost circuit includes transistor Q1, and the base of transistor Q1 is connected to the low-voltage driving circuit; transistor Q1 is connected to transformer T1.

[0017] Further, the filtering and shaping circuit includes a filter; the high-voltage alternating-current signal is filtered and shaped into a high-voltage direct-current signal by the filter.

[0018] Further, the filter includes capacitor C9, capacitor C10 and resistor R13, and capacitor C9 and capacitor C10 are connected in series and then connected in parallel with resistor R13.

[0019] Further, the high-voltage feedback circuit includes a voltage-dividing resistor R15. The high-voltage AC signal is divided by the voltage-dividing resistor R15 to obtain a high-voltage feedback signal, and the high-voltage feedback signal is output to the low-voltage drive circuit for comparison with the low-voltage signal, so that the low-voltage drive circuit can perform high-voltage regulation.

[0020] A working method of a heat-resistant controllable high-voltage power supply circuit, based on the above-mentioned heat-resistant controllable high-voltage power supply circuit, includes:

[0021] According to the reference voltage provided by the reference power supply circuit, the low-voltage drive circuit adjusts the low-voltage control signal and the high-voltage feedback signal and outputs a low-voltage AC signal; the boost circuit boosts the low-voltage AC signal output by the low-voltage drive circuit to a high-voltage AC signal; the filter shaping circuit filters and shapes the high-voltage AC signal output by the boost circuit into a high-voltage DC signal; the high-voltage feedback circuit outputs the high-voltage DC signal from the filter shaping circuit as a high-voltage feedback signal to the low-voltage drive circuit.

[0022] An application of the above-mentioned heat-resistant controllable high-voltage power supply circuit, wherein the heat-resistant controllable high-voltage power supply circuit is arranged in a through-drill tool instrument.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a heat-resistant controllable high-voltage power supply circuit, including a reference power supply circuit, a low-voltage drive circuit, a boost circuit, a filter shaping circuit and a high-voltage feedback circuit. The reference power supply circuit provides a reference voltage, and the low-voltage drive circuit is responsible for adjusting the low-voltage control signal and the high-voltage feedback signal and outputting a low-voltage AC signal; the boost circuit boosts the low-voltage AC signal output by the low-voltage drive circuit to a high-voltage AC signal; the filter shaping circuit filters and shapes the high-voltage AC signal output by the boost circuit into a high-voltage DC signal; the high-voltage feedback circuit outputs the high-voltage DC signal from the filter shaping circuit as a high-voltage feedback signal to the low-voltage drive circuit; it realizes the control of the output range of the high-voltage power supply through the low-voltage DC power supply signal, can effectively adjust the high-voltage output according to environmental changes, ensures that the photomultiplier tube works within the plateau region, and meets the working requirements of the photomultiplier tube; the circuit structure and principle are simple, the work is stable and reliable, and it has good popularization and application value.

[0025] The present invention also provides a working method of a heat-resistant controllable high-voltage power supply circuit. Based on the above-mentioned heat-resistant controllable high-voltage power supply circuit, this method can solve the problem that it is difficult to effectively regulate the output high voltage of the existing controllable high-voltage power supply. This method can effectively adjust the required high-voltage power supply, thereby ensuring the environmental requirements of the photomultiplier tube and the He3 detector in radioactive logging.

[0026] The present invention also provides an application of a high-temperature-resistant controllable high-voltage power supply circuit. The high-temperature-resistant controllable high-voltage power supply circuit is arranged in a through-drill tool instrument. According to device selection, the external dimensions of the high-temperature-resistant controllable high-voltage power supply circuit are made very small, and it can be fully adapted to the through-drill tool instrument. The high-temperature-resistant controllable high-voltage power supply circuit can be applied to the downhole high-temperature and high-pressure working environment, and can withstand the working intensity of a downhole temperature of 175° for more than 20 hours. This improves the high-temperature resistance performance of the through-drill tool instrument, and at the same time improves the controllable voltage regulation performance of the through-drill tool instrument, meeting the requirements of various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. is a schematic structural diagram of a high-temperature-resistant controllable high-voltage power supply circuit provided by an embodiment of the present invention;

[0028] Figure 2 FIG. is a working principle diagram of a high-temperature-resistant controllable high-voltage power supply circuit provided by an embodiment of the present invention;

[0029] Figure 3 FIG. is a relationship diagram of low-voltage control voltage and high-voltage output provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following specific embodiments are used to further elaborate on the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0035] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0036] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The following further describes the present invention in detail with reference to the drawings:

[0038] Embodiment

[0039] Combined with what is mentioned in the background technology, in radioactive logging, the ray detectors generally used are mostly crystal detectors. The crystal detectors require photomultiplier tubes to convert the crystal scintillation signals into electrical signals, and the operation of the photomultiplier tubes requires a high-voltage power supply of kilovolts. In addition, the He3 detector for detecting neutrons also needs to be powered by a high-voltage power supply of more than one thousand volts. Moreover, the operation of the photomultiplier tubes and the He3 detectors has a flat region. In order to make the measurement stable and reliable, it is necessary to ensure that the multiplier tube operates within the flat region. This requires that the high-voltage power supply for the nuclear signal detector must be adjustable. When the environment changes, the multiplier tube can be adjusted to be in the flat region working state by adjusting the high-voltage power supply. The current controllable high-voltage power supply cannot meet the above requirements.

[0040] To solve the above problems, this embodiment provides a high-temperature-resistant controllable high-voltage power supply circuit. Its working principle is as follows: An alternating low-voltage power supply is coupled into an alternating high-voltage power supply, and with the assistance of some reference circuits, feedback circuits, and filtering circuits, a reliable and stable high-voltage power supply is obtained. By using this high-voltage power supply circuit, the required high-voltage power supply can be effectively regulated to ensure that the photomultiplier tube and the He3 detector operate within the plateau region, thereby making the instrument measurement stable and reliable.

[0041] The following will specifically describe the structure of this embodiment in conjunction with the accompanying drawings:

[0042] As Figure 1 shown, this embodiment provides a high-temperature-resistant controllable high-voltage power supply circuit, which specifically includes a reference power supply circuit, a low-voltage drive circuit, a boost circuit, a filter shaping circuit, and a high-voltage feedback circuit.

[0043] Among them, the low-voltage drive circuit is also connected to a low-voltage control power supply that provides a low-voltage control signal for it. The low-voltage control power supply is used to input a low-voltage control signal to the low-voltage drive circuit to achieve adjustable high-voltage output.

[0044] In this embodiment, the reference power supply circuit provides a reference voltage for the low-voltage drive circuit; the low-voltage drive circuit adjusts according to the magnitudes of the input low-voltage control signal and the high-voltage feedback signal to stabilize the high-voltage power supply within the required range and output a low-voltage alternating signal; the boost circuit converts the low-voltage alternating signal into a high-voltage alternating signal through a transformer; the filter shaping circuit converts the alternating high-voltage signal into a high-voltage direct-current signal; the high-voltage feedback circuit outputs a voltage-divided signal of the high-voltage direct-current signal to reflect the magnitude of the output high voltage.

[0045] As Figure 2 shown, this embodiment provides a high-temperature-resistant controllable high-voltage power supply circuit, and its specific working principle is as follows:

[0046] In this embodiment, the high-temperature-resistant controllable high-voltage power supply circuit includes a reference power supply circuit, a low-voltage drive circuit, a boost circuit, a filter shaping circuit, and a high-voltage feedback circuit. Among them, the reference power supply circuit provides a reference voltage of 5V, and the low-voltage drive circuit generates low-voltage drive alternating signals with different amplitudes according to the signals of the high-voltage feedback circuit; the low-voltage drive alternating signals are then passed through the boost circuit to generate a high-voltage signal with alternating voltage, and then become a direct-current signal after passing through the filter shaping circuit.

[0047] Combined with Figure 2 , the specific working steps of the controllable high-voltage power supply circuit provided in this embodiment are as follows:

[0048] In this embodiment, the reference power supply circuit is implemented by power supply U5, which outputs an accurate 5V power supply as the reference for the low-voltage drive circuit. Then, it is driven by operational amplifier U6B to increase the driving ability and is output to the low-voltage drive circuit.

[0049] In this embodiment, in the low-voltage drive circuit, one of the input signals for low-voltage drive is the low-voltage control signal HV_CNT, and the other is the high-voltage feedback signal from the high-voltage feedback circuit. These two signals are input to operational amplifier U6A. Its output signal, after passing through feedback capacitor C13 and resistor R37, serves as the control input signal for triode Q7. After being driven by Q7, it is output to the boost circuit. The output signal of operational amplifier U6A is connected to the base of triode Q3. After feedback through resistor R21 and resistor R22, it is input to NAND gate U4C, and after performing a NAND operation with +5V, it is input to operational amplifier U4B; then it is input to operational amplifier U4D, and after performing a NAND operation with +5V again, the driving ability is also increased, and it is output to pin 2 of transformer T1 in the boost circuit; on the other hand, this output signal is connected to the base of triode Q2 through operational amplifier U4A to control the on / off of triode Q2.

[0050] In this embodiment, the input signal of triode Q1 in the boost circuit comes from the low-voltage drive circuit, which is connected to the base of triode Q1 to control its on / off, and then serves as the input signal of transformer T1 and is connected to pin 2; a square wave signal will be generated between it and pin 1 of transformer T1. After being boosted by transformer T1, it becomes a high-voltage AC signal.

[0051] The boosted high-voltage AC signal becomes a high voltage with large fluctuations after passing through capacitor C11, diode D1, and diode D2, and then becomes a DC high-voltage DC signal +HV after passing through the filter composed of capacitor C10, capacitor C9, and resistor R13, completing the boosting process.

[0052] After the high-voltage DC signal +HV passes through voltage-dividing resistor R15, the divided low-voltage signal is filtered by capacitor C12 and then used as the high-voltage feedback signal to be connected to U6A. After comparing with the low-voltage control signal HV_CNT, the feedback adjustment of the high-voltage value can be realized, thereby realizing adjustable high voltage.

[0053] The high-temperature-resistant controllable high-voltage power supply circuit provided in this embodiment can control its high-voltage output within 2000V by inputting a low-voltage control signal of 0 - 5V, and its input and output are linearly related. As Figure 3As shown, the abscissa represents the low-voltage control voltage and the ordinate represents the high-voltage output voltage. When the low-voltage control voltage gradually increases from 0 to 5V, when it is below 0.8V, the high-voltage output is 0V. When it exceeds 0.8V, as the low-voltage control voltage increases, the high-voltage output also rises. When the low-voltage control voltage is 2V, the high-voltage output voltage is about 500V. When the low-voltage control voltage is 3V, the high-voltage output voltage is about 900V. When the low-voltage control voltage is 5V, the high-voltage output voltage is about 2000V. Thus, it can be seen that there is a linear variation relationship between the two, and the relationship formula between the two can be recorded as: y = ax + b, where y is the high-voltage output voltage, x is the low-voltage control voltage, and a and b are constants.

[0054] This embodiment is used to provide a high-voltage power supply for the He3 detector in the compensated neutron logging tool. The He3 detector in the compensated neutron logging tool requires a high-voltage power supply of 1350V, which can be achieved by using the high-temperature controllable high-voltage power supply circuit provided in this embodiment. When in use, a +12V DC power supply needs to be provided to the circuit, and then a low-voltage source of about 3.8V is input at the control end (the input end of the low-voltage control circuit), and fine-tuning can be performed according to the output voltage. At this time, a high voltage of 1350V will be output at the output end, and this high-voltage power supply can be used to make the He3 detector work normally, ensuring that the He3 detector works within the plateau region, and thus ensuring its stable working performance.

[0055] The controllable high-voltage power supply circuit provided by the embodiment is more widely used in density logging tools. The photomultiplier tube detector used in density tools needs to be driven by high voltage. Since the density tool has a requirement for spectrum stability, the high voltage also needs to be adjusted in real time. When using this circuit, a +12V DC power supply is also supplied. Note that the low-voltage control end should be connected to the output end of the DAC. In this way, the control voltage of the circuit can be changed by changing the output of the DAC, so as to control the output of the high voltage at the set value and achieve the function of spectrum stability.

[0056] Based on the above-mentioned high-temperature resistant controllable high-voltage power supply circuit, this embodiment also provides an application of the high-temperature resistant controllable high-voltage power supply circuit, which is arranged in the through-drill tool instrument; due to the limitation of the drill tool size, the diameter of the through-drill tool instrument is very small. Therefore, the size of the controllable high-voltage power supply circuit is also correspondingly limited, generally within a space of less than 38 mm; all components of this controllable high-voltage power supply circuit are selected as high-temperature resistant devices, so it can withstand the high temperature of 175 °C underground for more than 20 hours. This enables this circuit to be applicable to the working environment of high temperature and high pressure underground; moreover, the external dimensions of this circuit can be made very small through component selection, which is especially suitable for radioactive instruments in the through-drill tool series. The high-temperature resistant controllable high-voltage power supply circuit can be applicable to the working environment of high temperature and high pressure underground, can withstand the working intensity of high temperature of 175 °C underground for more than 20 hours, improves the high-temperature resistance performance of the through-drill tool instrument, and at the same time improves the controllable voltage regulation performance of the through-drill tool instrument, meeting the requirements of various working conditions.

[0057] In summary, a high-temperature resistant controllable high-voltage power supply circuit of the present invention has the following advantages compared with the existing controllable high-voltage power supply:

[0058] This high-temperature resistant controllable high-voltage power supply circuit includes a reference power supply circuit, a low-voltage drive circuit, a boost circuit, a filter shaping circuit, and a high-voltage feedback circuit. The reference power supply circuit provides a reference voltage, and the low-voltage drive circuit is responsible for adjusting the low-voltage control signal and the high-voltage feedback signal and outputting a low-voltage alternating current signal; the boost circuit boosts the low-voltage alternating current signal output by the low-voltage drive circuit to a high-voltage alternating current signal; the filter shaping circuit filters and shapes the high-voltage alternating current signal output by the boost circuit into a high-voltage direct current signal; the high-voltage feedback circuit outputs the high-voltage direct current signal from the filter shaping circuit as a high-voltage feedback signal to the low-voltage drive circuit; it realizes controlling the output range of the high-voltage power supply through a low-voltage direct current power supply signal, can effectively adjust the high-voltage output according to environmental changes, ensures that the photomultiplier tube works within the plateau region, and meets the working requirements of the photomultiplier tube; the structure and principle of this circuit are simple, the work is stable and reliable, and it has good popularization and application value.

[0059] The above-mentioned embodiments are only one of the implementation manners that can realize the technical solution of the present invention. The scope of protection required by the present invention is not only limited by this embodiment, but also includes any changes, substitutions, and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A high-temperature-resistant controllable high-voltage power supply circuit, characterized in that, it includes a reference power supply circuit, a low-voltage drive circuit, a boost circuit, a filter shaping circuit, and a high-voltage feedback circuit; the reference power supply circuit is used to provide a reference voltage for the low-voltage drive circuit; the low-voltage drive circuit is used to adjust and output a low-voltage AC signal according to the input low-voltage control signal and high-voltage feedback signal, so that the output high-voltage power supply is stabilized within a preset range; the boost circuit is used to boost the low-voltage AC signal output by the low-voltage drive circuit to a high-voltage AC signal; the filter shaping circuit is used to filter and shape the high-voltage AC signal output by the boost circuit into a high-voltage DC signal; the high-voltage feedback circuit is used to output the high-voltage DC signal from the filter shaping circuit as a high-voltage feedback signal to the low-voltage drive circuit.

2. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 1, characterized in that, the reference power supply circuit uses power supply U5, and power supply U5 outputs a 5V reference voltage to operational amplifier U6B, and the output end of the operational amplifier U6B is connected to the low-voltage drive circuit.

3. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 1, characterized in that, the low-voltage drive circuit includes operational amplifier U6A; the input ends of the operational amplifier U6A are respectively connected to the high-voltage feedback circuit and the low-voltage control circuit. One path of the output end of the operational amplifier U6A passes through capacitor C13 and resistor R37 and is connected to transistor Q7 of the boost circuit; the other path is connected to the base of transistor Q3, passes through resistor R21 and resistor R22 and is connected to NAND gate U4C. NAND gate U4C is sequentially connected with NAND gate U4B and NAND gate U4D, and NAND gate U4D is connected to the boost circuit.

4. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 3, characterized in that, a resistor R17 is connected between NAND gate U4B and NAND gate U4D.

5. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 1, characterized in that, the boost circuit includes transistor Q1, and the base of the transistor Q1 is connected to the low-voltage drive circuit; the transistor Q1 is connected to transformer T1.

6. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 1, characterized in that, the filter shaping circuit includes a filter; the high-voltage AC signal is filtered and shaped into a high-voltage DC signal by the filter.

7. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 6, characterized in that, the filter includes capacitor C9, capacitor C10 and resistor R13, and capacitor C9 and capacitor C10 are connected in series and then connected in parallel with resistor R13.

8. The high-temperature-resistant controllable high-voltage power supply circuit according to claim 1, characterized in that, the high-voltage feedback circuit includes voltage-dividing resistor R15. The high-voltage AC signal is divided by the voltage-dividing resistor R15 to obtain a high-voltage feedback signal, and the high-voltage feedback signal is output to the low-voltage drive circuit for comparison with the low-voltage signal, so that the low-voltage drive circuit can perform high-voltage regulation.

9. A working method of a high-temperature resistant controllable high-voltage power supply circuit, based on the high-temperature resistant controllable high-voltage power supply circuit according to any one of claims 1-8, characterized in that, it includes: According to the reference voltage provided by the reference power supply circuit, the low-voltage drive circuit adjusts the low-voltage control signal and the high-voltage feedback signal and outputs a low-voltage AC signal; The boost circuit boosts the low-voltage AC signal output by the low-voltage drive circuit to a high-voltage AC signal; the filter shaping circuit filters and shapes the high-voltage AC signal output by the boost circuit into a high-voltage DC signal; the high-voltage feedback circuit outputs the high-voltage DC signal from the filter shaping circuit as a high-voltage feedback signal to the low-voltage drive circuit.

10. An application of the high-temperature resistant controllable high-voltage power supply circuit according to any one of claims 1-8, characterized in that, the high-temperature resistant controllable high-voltage power supply circuit is arranged in a through-drill tool instrument.

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