CN219760868U

CN219760868U - 0-15 KV adjustable precision DC-DC converter

Info

Publication number: CN219760868U
Application number: CN202320706179.7U
Authority: CN
Inventors: 魏海阔
Original assignee: Xi'an Kesuo Electronic Technology Co ltd
Current assignee: Xi'an Kesuo Electronic Technology Co ltd
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2023-09-26
Anticipated expiration: 2033-04-03

Abstract

The utility model relates to a 0-15 KV adjustable precision DC-DC converter, which comprises a shell and a conversion circuit, wherein the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with an output terminal of the DC-DC converter; the conversion circuit also comprises a sampling circuit, a constant voltage and constant current calibration circuit and a control circuit. The DC-DC converter can reduce the volume of a high-voltage power supply module, simplify the structure of the high-voltage power supply module, improve the modularization degree of the high-voltage power supply module, and strengthen the voltage-stabilizing overvoltage protection, thereby improving the working stability of the high-voltage power supply, reducing the maintenance difficulty of the high-voltage power supply module and reducing the use cost of the high-voltage power supply module.

Description

0-15 KV adjustable precision DC-DC converter

Technical Field

The utility model relates to the technical field of DC-DC converters, in particular to a 0-15 KV adjustable precision DC-DC converter.

Background

The DC-DC converter is a voltage converter that converts an input direct-current voltage into an output direct-current voltage. According to the difference of the level relationship between the input direct current voltage and the output direct current voltage, the DC/DC converter is classified into three types: step-up DC-DC converter, step-down DC-DC converter, and step-up DC-DC converter. At present, the DC-DC converter is widely applied to products such as automobiles, computers, mobile phones, displays, digital cameras, portable media players and the like.

The DC-DC converter may be used as a high voltage power supply module to provide a continuously adjustable direct current high voltage output for a load in the range of 0V to ± 15000V. Most of the boosting high-voltage power supply modules with the same voltage level in the prior art are large in size, complex in structure, low in modularization degree, imperfect in voltage stabilizing and overvoltage protection, low in working stability, high in maintenance difficulty and high in use cost.

Disclosure of Invention

In order to solve one or more of the technical problems in the prior art, the utility model provides the 0-15 KV adjustable precision DC-DC converter, so that the volume of a high-voltage power supply module is reduced, the structure of the high-voltage power supply module is simplified, the modularization degree of the high-voltage power supply module is improved, high-precision components are adopted in key circuits, the precision of the high-voltage power supply is improved, and the voltage stabilizing overvoltage protection is enhanced, so that the working stability of the high-voltage power supply is improved, the maintenance difficulty of the high-voltage power supply module is reduced, and the use cost of the high-voltage power supply module is reduced.

The utility model provides a 0-15 KV adjustable precision DC-DC converter, which comprises a shell and a conversion circuit, wherein the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter; the conversion circuit further comprises a sampling circuit, a constant voltage and constant current calibration circuit and a control circuit; the sampling circuit comprises voltage sampling and current sampling, and is used for collecting output voltage and current of the DC-DC converter; the constant voltage and constant current calibration circuit is used for ensuring that the output voltage and current of the DC-DC converter are within a certain safety range and preventing the output voltage and current from being too large to cause damage; the control circuit is mainly used for controlling the frequency of the oscillation boosting loop of the DC-DC converter to enable the oscillation boosting loop to work normally.

In one embodiment, the input filter circuit comprises a first inductor, a second inductor and a first capacitor, wherein one end of the first inductor is connected with the positive power input terminal of the DC-DC converter, the other end of the first inductor is connected with the second inductor in series, the other end of the second inductor is an output end of the input filter circuit, and a connection point of the first inductor and the second inductor is connected with the first capacitor and then grounded.

In one embodiment, the oscillating boost circuit is a push-pull oscillating boost circuit and comprises a first field effect tube, a second field effect tube and a boost transformer, wherein the two primary coils of the boost transformer are connected in series, two ends of the primary coils are respectively connected with drain electrodes of the first field effect tube and the second field effect tube, a middle tap of the primary coil is connected with an output end of the input filter circuit, source electrodes of the first field effect tube and the second field effect tube are grounded, and grid electrodes of the first field effect tube and the second field effect tube are respectively controlled by the control circuit.

In one embodiment, the voltage doubling circuit is a ten-stage voltage doubling circuit, and comprises second to eleventh capacitors and first to twelfth pole tubes, wherein each stage of voltage doubling circuit comprises one capacitor and one diode which are connected in series, and then the capacitors and the diodes are connected in series according to the principle of polarity addition so as to achieve the purpose of voltage doubling, the first stage of voltage doubling circuit is connected with the secondary coil of the step-up transformer so as to input the boosted voltage, and the ten-stage voltage doubling circuit outputs ten times of voltage. The polarity of the diode in the voltage doubling circuit can be correspondingly adjusted according to the polarity of the output voltage of the DC-DC converter.

In one embodiment, the output filter circuit includes a first resistor, a second resistor, and a twelfth capacitor, wherein one end of the first resistor is connected to the output end of the voltage doubling circuit, the other end of the first resistor is connected in series with the second resistor, the other end of the second resistor is connected to the high voltage output terminal of the DC-DC converter, one end of the twelfth capacitor is connected to a node of the first resistor and the second resistor, and the other end of the twelfth capacitor is connected to the high voltage output ground of the DC-DC converter.

In one embodiment, the sampling circuit comprises a voltage sampling part and a current sampling part, wherein the voltage sampling circuit comprises a first operational amplifier, a third resistor, a fourth resistor, a fifth resistor and a thirteenth capacitor, one end of the third resistor is connected with the output end of the output filter circuit, the other end of the third resistor is connected with one end of the fourth resistor, a node of the third resistor is input to the non-inverting input end of the first operational amplifier, and the other end of the fourth resistor is grounded; one end of the fifth resistor is connected with the inverting input end of the first operational amplifier, and the other end of the fifth resistor is grounded; the thirteenth capacitor is connected with the inverting input end and the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the voltage sampling output terminal of the DC-DC converter; the current sampling circuit comprises a second operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor and a fourteenth capacitor, wherein one ends of the sixth resistor and the seventh resistor are connected, a node is connected with one virtual ground end of a secondary coil of the step-up transformer, the other end of the sixth resistor is grounded, the other end of the seventh resistor is connected with an inverting input end of the second operational amplifier, one end of the eighth resistor is connected with an in-phase input end of the second operational amplifier, the other end of the eighth resistor is grounded, the fourteenth capacitor is connected with the inverting input end and the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with a current sampling output terminal of the DC-DC converter.

In one embodiment, the constant voltage and constant current calibration circuit comprises a constant voltage calibration circuit and a constant current calibration circuit, which are the same in principle, wherein the constant voltage calibration circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fifteenth capacitor and a third operational amplifier. One end of the ninth resistor is connected with the voltage regulation input terminal of the DC-DC converter, the other end of the ninth resistor is connected with the non-inverting end of the third operational amplifier, one end of the tenth resistor is connected with the output end of the voltage sampling circuit, the other end of the tenth resistor is connected with one end of the eleventh resistor and the inverting end of the third operational amplifier, the other end of the eleventh resistor is grounded, and the fifteenth capacitor and the twelfth resistor are connected in series and then are connected with the inverting input end and the output end of the third operational amplifier; the constant current calibration circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth capacitor and a fourth operational amplifier, wherein one end of the thirteenth resistor is connected with a current regulation input terminal of the DC-DC converter, the other end of the thirteenth resistor is connected with a same-phase end of the fourth operational amplifier, one end of the fourteenth resistor is connected with an output end of the current sampling circuit, the other end of the fourteenth resistor is connected with one end of the fifteenth resistor and an inverting end of the fourth operational amplifier, the other end of the fifteenth resistor is grounded, and the sixteenth capacitor and the sixteenth resistor are connected with an inverting input end and an output end of the fourth operational amplifier in series.

In one embodiment, the control circuit includes a PWM control chip and its peripheral circuits, and the input terminal of the control circuit includes: the output end of the constant voltage calibration circuit and the output end of the constant current calibration circuit; the output end of the control circuit comprises: and the reference voltage output terminals are connected with the DC-DC converter and are respectively connected with the grids of the two field effect transistors in the oscillation boosting circuit.

In one embodiment, the input voltage range of the DC-DC converter is 11-16V or 21-28V, and the output voltage range is 0V to + -15000V.

In one embodiment, the housing is an all-metal shielding structure, and the circuit board of the DC-DC converter is assembled by two-sided board area-by-area three-dimensional stacking.

The technical scheme of the utility model has the following beneficial technical effects:

the DC-DC converter adopts microminiature components and adopts a modularized three-dimensional welding mode, so that the volume of a high-voltage power supply module is reduced, the structure is simple, the modularization design is adopted, the modularization degree is high, the key components adopt high-precision components, the precision of the high-voltage power supply is improved, and the voltage stabilizing overvoltage protection is enhanced, thereby improving the working stability of the high-voltage power supply, being easy to maintain and repair and reducing the use cost.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a schematic configuration diagram of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 2 is a circuit schematic of an input filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 3 is a circuit schematic of an oscillating boost circuit of a conversion circuit of a DC-DC converter according to an embodiment of the utility model;

fig. 4 is a circuit schematic of a voltage doubling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the utility model;

fig. 5 is a circuit schematic of an output filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 6 is a circuit schematic of a voltage sampling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 7 is a circuit schematic of a current sampling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 8 is a circuit schematic of a constant voltage calibration circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 9 is a circuit schematic of a constant current calibration circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model;

fig. 10 is a schematic structural diagram of a control circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model.

Fig. 11 is a schematic diagram of an internal layout of a DC-DC converter according to an embodiment of the utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that when the terms "first," "second," and the like are used in the claims, the specification and the drawings of the present utility model, they are used merely for distinguishing between different objects and not for describing a particular sequential order. All the drawings and the description are only for the case where the high voltage output is positive voltage, and the case where the high voltage output is negative voltage is slightly adjusted internally, and will not be described here. The terms "comprises" and "comprising" when used in the specification and claims of the present utility model are taken to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The utility model provides a wide DC-DC converter, which comprises a shell and a conversion circuit. Fig. 1 is a schematic configuration diagram of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 1, the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, wherein the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter; the conversion circuit also comprises a sampling circuit, a constant voltage and constant current calibration circuit and a control circuit. The sampling circuit comprises voltage sampling and current sampling, and is used for collecting output voltage and current of the DC-DC converter; the constant voltage and constant current calibration circuit is used for ensuring that the output voltage and current of the DC-DC converter are within a certain safety range and preventing the output voltage and current from being too large to cause damage; the control circuit is mainly used for controlling the frequency of the oscillation boosting loop of the DC-DC converter to enable the oscillation boosting loop to work normally.

Fig. 2 is a circuit schematic of an input filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 2, the input filter circuit includes a first inductor L1, a second inductor L2, and a first capacitor C1. The power input terminal (voltage signal Vin) of the DC-DC converter outputs a filtered voltage Vf after passing through the LCL filter circuit, and the circuit is used for filtering alternating current components in an input direct current voltage signal.

Fig. 3 is a circuit schematic of an oscillating boost circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 3, the oscillating boost circuit is a push-pull oscillating boost circuit, and includes a first fet Q1, a second fet Q2, and a boost transformer T1. The field effect transistors Q1 and Q2 respectively control two coils of the primary of the step-up transformer T1, the grid electrodes of the field effect transistors Q1 and Q2 are connected with the control circuit, the switching frequency of the field effect transistors Q1 and Q2 is controlled by the control circuit, the middle tap of the primary coil is connected with the input filter voltage Vf, and the secondary coil of the step-up transformer serves as the output ends Vr and Vg of the step-up transformer. CtrlA is the control signal for fet Q1 and CtrlB is the control signal for fet Q2.

Fig. 4 is a circuit schematic of a voltage doubler circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 4, the voltage doubling circuit is a ten-stage voltage doubling circuit, wherein each stage of voltage doubling circuit comprises one capacitor and one diode which are connected in series, and then the voltage doubling circuit is connected in series according to the principle of polarity addition so as to achieve the purpose of voltage doubling, the first stage of voltage doubling circuit is connected with the Vr end of the secondary coil of the step-up transformer so as to input the boosted voltage, and the six stages of voltage doubling circuits output ten-stage voltage Vm. The voltage doubler circuit amplifies by discharging the switch of the diode and the capacitor. In this embodiment, the voltage doubling circuit is a voltage doubling circuit, and outputs a positive voltage. It should be understood that the voltage doubling circuit may be other voltage doubling circuits, such as a voltage doubling circuit, depending on the magnitude of the desired output voltage; the output may be a negative voltage, and the diode direction may be adjusted, which is not particularly limited in the present utility model.

Fig. 5 is a circuit schematic of an output filter circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 5, the output filter circuit includes a first resistor R1, a second resistor R2, and a twelfth capacitor C12. The above elements constitute an RCR filter circuit and are connected in series between the voltage doubling circuit and the high-voltage output terminal of the DC-DC converter to filter the alternating current component of the high-voltage signal. Vout is the output voltage signal and HGND is ground.

Fig. 6 is a circuit schematic of a voltage sampling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 6, the voltage sampling circuit includes a first operational amplifier U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a thirteenth capacitor C13. The third resistor R3 and the fourth resistor R4 divide the voltage and sample the high voltage output voltage Vout, and then input the sampled voltage to the non-inverting input terminal of the first operational amplifier U1, the inverting input terminal of the first operational amplifier U1 is grounded through the fifth resistor R5, the thirteenth capacitor C13 is connected to the inverting input terminal and the output terminal of the first operational amplifier U1 to form feedback, and the output terminal Vs of the first operational amplifier U1 outputs a voltage sampling signal through the voltage sampling output terminal of the DC-DC converter and also inputs the voltage sampling signal to the constant voltage calibration circuit.

Fig. 7 is a circuit schematic of a current sampling circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 7, the current sampling circuit includes a second operational amplifier U2, a sixth resistor R6, a seventh resistor R7, and a fourteenth capacitor C14. After the sixth resistor R6 Is connected to the Vg end of the secondary winding of the step-up transformer to sample the current, the current Is input to the inverting input end of the second operational amplifier U2 through the seventh resistor R7, the non-inverting input end of the second operational amplifier U2 Is grounded through the eighth resistor R8, the fourteenth capacitor C14 Is connected to the inverting input end and the output end of the second operational amplifier U2 to form feedback, and the output end Is of the second operational amplifier U2 outputs a current sampling signal through the current sampling output terminal of the DC-DC converter and Is also input to the constant current calibration circuit.

Fig. 8 is a circuit schematic of a constant voltage calibration circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 8, the constant voltage calibration circuit includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fifteenth capacitor C15, and a third operational amplifier U3. The non-inverting terminal of the third operational amplifier U3 is connected to the voltage regulation input terminal Vadj of the DC-DC converter through a ninth resistor R9, the inverting terminal of the third operational amplifier U3 is connected to the voltage sampling output signal Vs through a tenth resistor R10 and an eleventh resistor R11, and the fifteenth capacitor C15 and the twelfth resistor R12 are connected in series and then connected to the inverting input terminal and the output terminal Vc of the third operational amplifier U3 to form feedback. The constant voltage calibration circuit makes the output voltage of the DC-DC converter more stable by comparing the user input set voltage with the sampling voltage.

Fig. 9 is a circuit schematic of a constant current calibration circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 9, the constant current calibration circuit includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a sixteenth capacitor C16, and a fourth operational amplifier U4. The non-inverting terminal of the fourth operational amplifier U4 Is connected to the current adjusting input terminal Iadj of the DC-DC converter through a thirteenth resistor R13, the inverting terminal of the fourth operational amplifier U4 Is connected to the current sampling output signal Is through a fourteenth resistor R14 and a fifteenth resistor R15, and the sixteenth capacitor C16 and the sixteenth resistor R16 are connected in series to connect the inverting input terminal Ic and the output terminal Ic of the fourth operational amplifier U4 to form feedback. The constant current calibration circuit enables the output current of the DC-DC converter to be more stable through comparison processing of the user input set current and the sampling current.

Fig. 10 is a schematic structural diagram of a control circuit of a conversion circuit of a DC-DC converter according to an embodiment of the present utility model. As shown in fig. 10, the control circuit includes a PWM control chip and its peripheral circuits, and the input signal includes an output signal Vc of the constant voltage calibration circuit and an output signal Ic of the constant current calibration circuit. The output signal includes: vref connected to the reference voltage output terminal of the DC-DC converter, and CtrlA and CtrlB respectively connected to the gates of two field effect transistors Q1 and Q2 in the oscillation boosting circuit. The reference voltage Vref is used when a user adjusts the output voltage and current; ctrlA and CtrlB control the switching frequency of the oscillating boost circuit, thereby adjusting the output result to reach the user set target and protecting the DC-DC converter itself.

Fig. 11 is a schematic diagram of an internal layout of a DC-DC converter according to an embodiment of the utility model. As shown in fig. 11, the inside of the DC-DC converter adopts a double-plate three-dimensional assembly structure, and the control detection area is independently made into a small plate for vertical assembly, thereby reducing the volume of the DC-DC converter.

In one embodiment, the input voltage range of the DC-DC converter is 11-16V or 21-28V, and the output voltage range is 0V to + -15000V. The output voltage is adjustable in the range of the output voltage, and a user can adjust the amplitude of the output high voltage through two modes of voltage adjustment or potentiometer adjustment.

In one embodiment, the housing is an all-metal shielding structure, and the external dimension of the housing is 128×40×24mm, and the weight of the housing is about 220 g. The metal shell may be a copper shell or an aluminum shell. The number of terminals of the DC-DC converter may be 16. The conversion circuit adopts microminiature components and parts inside, adopts SMT technology welding, and the three-dimensional pile assembly of double faced board subregion, structural layout is reasonable to reduce the volume of converter.

In one embodiment, the interior of the housing is filled with a high pressure resistant, thermally conductive adhesive to expedite the dissipation of heat generated during operation of the conversion circuit.

In one embodiment, the terminals of the DC-DC converter are matched with high-voltage silica gel leads by adopting pins so as to ensure high insulation, high voltage resistance and low loss.

The structure of the DC-DC converter of the present utility model is described in detail above by means of specific embodiments. In the use process, the input voltage is subjected to filtering treatment and then the oscillation frequency is controlled by the control circuit, then the input voltage is subjected to boosting voltage doubling circuit and then the output high voltage is output, and finally the output is obtained after the filtering treatment is performed again. Meanwhile, the output high voltage is fed back to the control loop through the sampling circuit so as to obtain stable output and provide a sampling data output function. In addition, the DC-DC converter has a constant voltage and constant current calibration circuit to provide stable voltage and current.

It will be further understood by those skilled in the art from the foregoing description of the present specification that terms such as "upper," "lower," and the like, which indicate an orientation or a positional relationship, are based on the orientation or positional relationship shown in the drawings of the present specification, are for convenience only in describing aspects of the present utility model and simplifying the description, and do not explicitly or implicitly refer to devices or elements that must have the particular orientation, be constructed and operated in the particular orientation, and thus the above orientation or positional relationship terms should not be interpreted or construed as limiting aspects of the present utility model.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The 0-15 KV adjustable precision DC-DC converter comprises a shell and a conversion circuit, and is characterized in that the conversion circuit comprises an input filter circuit, an oscillation boosting circuit, a voltage doubling circuit and an output filter circuit which are sequentially connected, wherein the input filter circuit is connected with a power input terminal of the DC-DC converter, and the output filter circuit is connected with a high-voltage output terminal of the DC-DC converter;

the conversion circuit further comprises a sampling circuit, a constant voltage and constant current calibration circuit and a control circuit, wherein the sampling circuit comprises a voltage sampling circuit and a current sampling circuit, the voltage sampling circuit collects output voltage signals of the DC-DC converter and outputs the output voltage signals to a voltage sampling output terminal of the DC-DC converter, and the current sampling circuit collects output current signals of the DC-DC converter and outputs the output current signals to a current sampling output terminal of the DC-DC converter; the constant voltage and constant current calibration circuit is used for ensuring that the output voltage and current of the DC-DC converter are within a certain safety range so as to prevent faults caused by overlarge voltage and current; the control circuit is connected with the oscillation boosting circuit to control the oscillation frequency of the oscillation boosting circuit;

the input filter circuit comprises a first inductor, a second inductor and a first capacitor, wherein one end of the first inductor is connected with a power input positive terminal of the DC-DC converter, the other end of the first inductor is connected with the second inductor in series, the other end of the second inductor is an output end of the input filter circuit, and a connection point of the first inductor and the second inductor is connected with the first capacitor and then grounded.

2. The 0-15 KV adjustable precision DC-DC converter according to claim 1, wherein the oscillation boosting circuit is a push-pull oscillation boosting circuit and comprises a first field effect tube, a second field effect tube and a boosting transformer, wherein two primary coils of the boosting transformer are connected in series, two ends of the primary coils are respectively connected with drain electrodes of the first field effect tube and the second field effect tube, a middle tap of each primary coil is connected with an output end of the input filter circuit, source electrodes of the first field effect tube and the second field effect tube are grounded, and grid electrodes of the first field effect tube and the second field effect tube are respectively controlled by the control circuit.

3. The 0-15 kv adjustable precision DC-DC converter according to claim 2, wherein the voltage doubling circuit is a ten-stage voltage doubling circuit, and includes second to eleventh capacitors and first to twelfth pole tubes, wherein each stage of voltage doubling includes one capacitor and one diode connected in series, and then connected in series according to a principle of polarity addition to achieve the purpose of voltage doubling, the first stage of voltage doubling circuit is connected with the secondary winding of the step-up transformer to input the boosted voltage, and the ten-stage voltage doubling circuit outputs ten times the voltage.

4. The 0-15 kv adjustable precision DC-DC converter according to claim 1, wherein the output filter circuit comprises a first resistor, a second resistor, and a twelfth capacitor, wherein one end of the first resistor is connected to the output terminal of the voltage doubling circuit, the other end is connected in series with the second resistor, the other end of the second resistor is connected to the high voltage output terminal of the DC-DC converter, one end of the twelfth capacitor is connected to a node of the first resistor and the second resistor, and the other end is connected to a high voltage output ground of the DC-DC converter.

5. The 0-15 KV adjustable precision DC-DC converter according to claim 2, wherein the sampling circuit comprises a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit comprises a first operational amplifier, a third resistor, a fourth resistor, a fifth resistor and a thirteenth capacitor, one end of the third resistor is connected with the output end of the output filter circuit, the other end of the third resistor is connected with one end of the fourth resistor, a node of the fourth resistor is input to the non-inverting input end of the first operational amplifier, and the other end of the fourth resistor is grounded; one end of the fifth resistor is connected with the inverting input end of the first operational amplifier, and the other end of the fifth resistor is grounded; the thirteenth capacitor is connected with the inverting input end and the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the voltage sampling output terminal of the DC-DC converter; the current sampling circuit comprises a second operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor and a fourteenth capacitor, wherein one ends of the sixth resistor and the seventh resistor are connected, a node is connected with one virtual ground end of a secondary coil of the step-up transformer, the other end of the sixth resistor is grounded, the other end of the seventh resistor is connected with an inverting input end of the second operational amplifier, one end of the eighth resistor is connected with an in-phase input end of the second operational amplifier, the other end of the eighth resistor is grounded, the fourteenth capacitor is connected with the inverting input end and the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with a current sampling output terminal of the DC-DC converter.

6. The 0-15 KV adjustable precision DC-DC converter according to claim 1, wherein the constant voltage constant current calibration circuit comprises a constant voltage calibration circuit and a constant current calibration circuit, the constant voltage calibration circuit is the same in principle, the constant voltage calibration circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fifteenth capacitor and a third operational amplifier, one end of the ninth resistor is connected with a voltage regulation input terminal of the DC-DC converter, the other end of the ninth resistor is connected with a non-inverting end of the third operational amplifier, one end of the tenth resistor is connected with an output end of the voltage sampling circuit, the other end of the tenth resistor is connected with one end of the eleventh resistor and an inverting end of the third operational amplifier, the other end of the eleventh resistor is grounded, and the fifteenth capacitor and the twelfth resistor are connected with an inverting input end and an output end of the third operational amplifier after being connected in series;

the constant current calibration circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth capacitor and a fourth operational amplifier, wherein one end of the thirteenth resistor is connected with a current regulation input terminal of the DC-DC converter, the other end of the thirteenth resistor is connected with a same-phase end of the fourth operational amplifier, one end of the fourteenth resistor is connected with an output end of the current sampling circuit, the other end of the fourteenth resistor is connected with one end of the fifteenth resistor and an inverting end of the fourth operational amplifier, the other end of the fifteenth resistor is grounded, and the sixteenth capacitor and the sixteenth resistor are connected with an inverting input end and an output end of the fourth operational amplifier in series.

7. The 0-15 kv adjustable precision DC-DC converter according to claim 6, wherein the control circuit includes a PWM control chip and a peripheral circuit thereof, and an input terminal of the control circuit includes: the output end of the constant voltage calibration circuit and the output end of the constant current calibration circuit; the output end of the control circuit comprises: and the reference voltage output terminals are connected with the DC-DC converter and are respectively connected with the grids of the two field effect transistors in the oscillation boosting circuit.

8. The 0-15 kv tunable precision DC-DC converter according to any one of claims 1 to 7, wherein an input voltage range of the DC-DC converter is 11-16V or 21-28V, and an output voltage range is 0V to ±15000V.

9. The 0-15 KV adjustable precision DC-DC converter according to claim 1, wherein the shell is of an all-metal shielding structure, and a circuit board of the DC-DC converter is assembled by means of double-sided board regional three-dimensional stacking.