A stepped capacitor configuration voltage multiplier module for a portable cold cathode X-ray source and its parameter optimization design method.

Abstract

This invention relates to a graded capacitor configuration voltage multiplier module for a portable cold cathode X-ray source and its parameter optimization design method, belonging to the field of power electronics technology. The method targets a bidirectional voltage multiplier rectifier circuit, establishing its charge transfer model and performing mathematical optimization with the goal of minimizing the total voltage drop, deriving the optimal proportional relationship between each capacitor stage. Compared to traditional equal-capacitance designs, the graded capacitor configuration rule optimizes the performance of the voltage multiplier rectifier circuit by using a differentiated capacitor configuration module. This achieves a synergistic reduction in load voltage drop without increasing the number of voltage multiplier stages or capacitor capacity, thereby improving the stability and efficiency of the X-ray source. This technology is applicable to the high-efficiency power supply design of portable X-ray sources. The invention also provides corresponding simulation and experimental verification schemes.

Description

Technical Field

[0001] This invention belongs to the field of power electronics technology and relates to a graded capacitor configuration voltage multiplier module for a portable cold cathode X-ray source and its parameter optimization design method. Background Technology

[0002] Portable cold cathode X-ray sources are lightweight and compact X-ray devices widely used in medicine, industry, and scientific research. In the design of portable X-ray sources, the voltage multiplier module, as one of its core components, plays a crucial role in boosting the low-voltage power supply to the required high voltage. The operational stability of the voltage multiplier module directly affects the performance and safety of the device, especially in portable devices where its size, weight, and voltage stability become critical design requirements.

[0003] The voltage multiplier rectifier circuit is a key component of the voltage multiplier module, typically composed of multiple cascaded capacitors and a rectifier. The capacitor value in the voltage multiplier circuit directly affects the stability and ripple level of the output voltage. Chinese patent CN110139456A, "A Multi-Stage Boost System for X-ray Machines," uses a two-stage boost structure to boost the voltage of a 24V lithium battery to 300V, and achieves high-voltage output through a high-frequency boost transformer and a voltage multiplier rectifier circuit. However, this design does not consider how to optimize the performance of the voltage multiplier module through capacitor allocation, especially in portable X-ray sources, where existing capacitor configurations cannot meet the requirements for output ripple and load voltage drop. Furthermore, existing voltage multiplier modules, such as Chinese patent CN114145766A, "Voltage Control Circuit and Dental X-ray Machine Tube Assembly," generally use a capacitor configuration with the same value for each stage. While this configuration method is simple, it is prone to problems such as large output ripple, high equivalent internal resistance, significant load voltage drop, and long start-up stabilization time under high-frequency drive and actual load conditions, leading to tube voltage fluctuations, dose instability, and even affecting imaging consistency.

[0004] Despite attempts to design portable X-ray sources using existing technologies, several shortcomings remain: (1) Existing voltage multiplier modules generally use capacitors with the same value. When multiple capacitors are configured, the capacitor configuration cannot be effectively optimized to solve the problem of output voltage drop, which affects the stability and working efficiency of the equipment. (2) Existing designs usually improve output stability by increasing the capacitance, but this method will increase the system size, which does not meet the design requirements of portable devices; (3) There is a lack of methods to optimize the configuration of capacitors under constraints. Existing technologies cannot optimize the capacitor allocation of the voltage multiplier module while ensuring portability, so as to achieve better output performance.

[0005] In view of this, there is an urgent need in the field for a method to optimize the design of the voltage multiplier module parameters of a portable cold cathode X-ray source with a stepped capacitor configuration. Without increasing the number of voltage multiplier stages or the total capacitance, this method can significantly improve the performance of the voltage multiplier module, reduce the load voltage drop, and shorten the settling time by optimizing the capacitor allocation, thereby improving the working efficiency and stability of the equipment. Summary of the Invention

[0006] In view of this, the present invention aims to solve the problems of significant load voltage drop and long start-up stabilization time that are common in existing portable cold cathode X-ray sources. Moreover, in portable applications, due to limitations in size and weight, these problems cannot be solved by simply increasing the capacitance value or increasing the number of voltage multiplication stages. The present invention proposes a voltage multiplication module with graded capacitor configuration and its design method. Without increasing the number of voltage multiplication stages or the total capacitance, the performance of the voltage multiplication module is significantly improved by optimizing the capacitor distribution, reducing load voltage drop, shortening stabilization time, and thus improving the working efficiency and stability of the equipment.

[0007] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides a method for optimizing the design of parameters of a stepped capacitor configuration voltage multiplier module for a portable cold cathode X-ray source, comprising the following steps: S1: Determine the number of stages n on one side of the positive and negative bidirectional voltage doubler rectifier circuit; S1: According to a preset capacitance ratio, assign capacitance values ​​to each stage of the capacitors in the circuit; wherein, the capacitance ratio is configured such that, from the output terminal to the input terminal of the circuit, the capacitance values ​​of each stage of the capacitor increase sequentially, and the ratio of the capacitance value of the i-th stage capacitor to the capacitance value C of the last stage capacitor is (n-i+1):1, where i=1,2,…,n, and the i-th stage contains two symmetrical capacitors with the same capacitance value; S3. Using circuit simulation software, establish a simulation model of the voltage doubler rectifier module based on the capacitance parameters allocated in step S2. S4. Run the simulation to obtain and evaluate at least one of the following performance metrics of the simulation model: output voltage ripple, voltage drop, and startup settling time.

[0008] Furthermore, the preset capacitance ratio is obtained by: establishing a charge transfer model for the positive and negative bidirectional voltage doubler rectifier circuit, and constructing an optimization function with the goal of minimizing the total voltage drop; under the constraint that the sum of the total capacitance values ​​is a constant, solving for the extreme values ​​of the optimization function to obtain the capacitance ratio.

[0009] Furthermore, the Lagrange multiplier method is used to solve for the extrema of the optimization function.

[0010] Furthermore, the optimization function F has the following form:

[0011] Where Q is the amount of charge delivered to the load by the final stage capacitor in a single cycle, C1, C2, …, C 2n Let C be the capacitance value of each capacitor in the circuit, numbered sequentially from top to bottom and from left to right. 2i-1 = C 2i (i=1,…,n).

[0012] Preferably, the bidirectional voltage doubler rectifier circuit is an octet rectifier circuit, n=2, with 2 stages for positive and 2 stages for negative; the capacitor ratio is specifically as follows: The capacitance of both the positive and negative voltage multipliers in the first stage is 2C. The capacitance of both capacitors in the second stage, the one for voltage multiplication and the one for voltage reduction, is C.

[0013] Preferably, the circuit simulation software used in this invention is PSIM.

[0014] On the other hand, the present invention also provides a graded capacitor configuration voltage multiplier module for a portable cold cathode X-ray source, which is applied to a portable X-ray machine and includes a positive and negative bidirectional voltage multiplier rectifier circuit. The capacitance values ​​of each stage of the capacitor in the circuit are determined using the design method described above. The circuit specifically includes: Input power supply, providing low-voltage DC power; The positive and negative bidirectional voltage doubler rectifier circuit uses multiple cascaded voltage doubler units to boost the input voltage to the required high voltage output. The capacitor configuration unit sets up multiple capacitors through a hierarchical and differentiated configuration method. The capacitor values ​​at each level are calculated according to the Lagrange optimization method to minimize the output voltage drop. The output port provides a stable high-voltage DC output for use with X-ray tubes. The capacitance values ​​in the capacitor configuration unit satisfy the following relationship:

[0015] Among them, C i Let C be the capacitance of the i-th stage. total k is the total capacitance. i To optimize the proportional coefficients of each stage of capacitors obtained from the calculation.

[0016] Furthermore, the voltage doubler rectifier circuit includes multiple cascaded capacitor units, and the capacitance value of each capacitor unit is configured differently according to optimization rules to reduce output ripple and load voltage drop.

[0017] Furthermore, the capacitor configuration unit calculates the optimal capacitor value using the Lagrange optimization method, thereby minimizing the output voltage ripple under the constraint of total capacitor capacity.

[0018] Finally, the present invention also provides a portable X-ray machine, including a high-voltage power supply module, wherein the high-voltage power supply module includes the voltage multiplier rectifier module.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Significantly improved overall performance: Through scientific capacitor ratio configuration, the charge transfer process inside the circuit is effectively coordinated. Under the same total capacitor cost, the output voltage ripple is reduced, the voltage drop during load changes is reduced, and the stabilization time of the output to reach steady state is shortened, thus comprehensively improving the dynamic response and steady-state accuracy of the high voltage power supply.

[0020] (2) Strong design guidance: It provides a complete design process from theoretical derivation to parameter calculation, transforming capacitor selection from empirical trial and error to precise model-based design, thereby improving R&D efficiency and predictability of results. Without increasing the number of stages and topological complexity, this method provides a feasible path for parameter optimization of positive and negative bidirectional voltage doubler rectifier circuits.

[0021] (3) Low implementation cost: The optimization process does not change the basic circuit topology. Performance can be improved by simply adjusting the parameters of existing capacitor components. It is especially suitable for portable devices that are highly sensitive to size, weight and cost.

[0022] (4) Suitable for portable applications: Performance improvement is achieved without significantly increasing the total capacitance or the number of voltage multipliers, avoiding a significant increase in size and weight. It is especially suitable for portable cold cathode X-ray sources with high requirements for miniaturization and lightweight.

[0023] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a block diagram of a portable X-ray machine. Figure 2 This is a schematic diagram of the positive and negative half-cycles of a bidirectional voltage multiplier rectifier. Figure 3 This is a schematic diagram of a voltage multiplier rectifier simulation. Figure 4 This is a comparison chart of simulated waveforms; Figure 5 To output a comparison chart of simulation data; Figure 6 Comparison of output voltage values ​​under high resistance; Figure 7 Comparison of output voltage values ​​under low resistance; Figure 8 Comparison of output voltage drop under different input signal frequencies; Figure 9 This is a schematic diagram of the pressure divider method; Figure 10 The output diagram shows the voltage divider results. Figure 11 The diagram shows the voltage output result derived from the reverse voltage divider. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] The following will be combined with the appendices in the technical disclosure materials. Figure 1-11 The present invention will be described in detail with reference to the embodiments.

[0028] This invention designs a voltage multiplier module for a portable cold cathode X-ray source, employing a graded capacitor configuration optimization method to optimize the module's output performance through differentiated capacitor values. Using Lagrange optimization, the optimal capacitor configuration ratio is obtained under volume and weight constraints, enabling the voltage multiplier module to effectively reduce output ripple, decrease load voltage drop, shorten settling time, and improve overall operating efficiency. This implementation combines theoretical derivation, simulation, and experimental verification to ensure the feasibility of the technical solution.

[0029] Before demonstrating the embodiments of the present invention, a brief explanation of the working principle of the portable X-ray machine will be given.

[0030] The structural block diagram of a portable X-ray machine is as follows: Figure 1 As shown, unlike ordinary X-ray sources, this system is typically powered by a lithium battery and consists of a DC-DC boost converter and inverter, a high-frequency high-voltage transformer, a voltage multiplier rectifier, an X-ray tube, and a control system. During operation, the low-voltage DC output from the lithium battery is first converted into high-frequency AC at tens of kilohertz by a half-bridge inverter, then boosted to a high-voltage AC of several kilovolts by a high-frequency transformer. Subsequently, the high-voltage output from the transformer is converted into a stable high-voltage DC by a voltage multiplier rectifier circuit.

[0031] Example 1: A hierarchical differentiated capacitor configuration method based on a CW octet voltage multiplier circuit.

[0032] This embodiment details the capacitor parameter optimization design method for a bidirectional voltage doubler rectifier circuit.

[0033] First, it should be noted that in a bidirectional N-stage voltage multiplier rectifier circuit (CW voltage multiplier circuit) composed of two symmetrical Cockcroft-Walton circuits, N is an even number, and the number of stages on one side of the upper or lower half is n = N / 2. This invention breaks the limitations of capacitor C in each stage. i Instead of the traditional approach of assigning the same value to each of the i=1,2,…,2n, a hierarchical differentiated configuration strategy is proposed.

[0034] Under the above premise, the optimization strategy for the graded differentiated capacitor values ​​of the circuit described in this embodiment is as follows: Assuming that in each cycle, the final stage capacitor of the circuit ( C 4 and c 4) The total charge delivered to the load is 2Q, and the total average load current is... For a single CW voltage multiplier rectifier circuit, the amount of charge delivered to the load by the last capacitor in each cycle is Q. Based on the definitions of charge and current, the charge Q and current are derived. As shown below.

[0035]

[0036]

[0037] Where U is the voltage change across the last capacitor (ripple voltage), and C is the capacitance value. The ripple voltage of the last capacitor is obtained from (1) and (2). As shown below.

[0038]

[0039] Furthermore, by analyzing the charge transfer process of a single Cockcroft-Walton voltage multiplier circuit, it can be deduced that, under the condition of an input voltage peak of V, the individual capacitors... voltage on Analysis shows that the capacitors responsible for energy transfer are the main factor affecting the output voltage drop ΔV. Through modeling, the total voltage drop ΔV can be expressed as a function of the capacitors at each stage. It is a function of the charge Q.

[0040] Since the bidirectional voltage multiplier rectifier consists of two symmetrical CW voltage multiplier rectifier circuits, we can start by working on a single CW voltage multiplier rectifier circuit. In the CW voltage multiplier rectifier circuit, because the positive and negative half-cycle voltage amplitudes are the same, the two capacitors in the first stage should have the same capacitance value, i.e. = .

[0041] capacitance When the input voltage signal is in the positive half-cycle, through the diode Give Charge, Equal to the input voltage; capacitor When the input voltage signal is in the negative half-cycle During discharge, a charge nQ is released. Voltage at both ends :

[0042] Similarly, it can be deduced that capacitor C2 charges during the negative half-cycle of the input voltage signal, and charges during the positive half-cycle of the input voltage signal. The amount of charge released is nQ, at this time Voltage at both ends for:

[0043] By analogy, the voltage across the last capacitor can be obtained. :

[0044] In a voltage doubler rectifier system, the series of capacitors responsible for energy transfer are more sensitive to voltage dips. Therefore, the lower bridge arm capacitor in the voltage doubler rectifier circuit is considered in relation to voltage dips, resulting in a voltage difference of... : To ensure the total voltage drop is minimized, the formula for the total voltage drop is constructed as follows:

[0045] In the process of finding the minimum value, the Lagrange method for finding the extreme value is used: Regulation Ci = C , Ci If the result is greater than 0, the Lagrange function is obtained, as shown below.

[0046]

[0047] To each , , ..., By taking the partial derivatives and setting them to zero, we can obtain the relationship between the capacitance values ​​of each stage and the constant:

[0048] in, .

[0049] Adding all the values ​​together, we get the values ​​of each capacitor level. :

[0050] The relationship between the first-stage capacitor and the nth-stage capacitor is expressed as a multiple, and the final relationship is shown below.

[0051]

[0052] Let the capacitance of the last stage be C, then we get:

[0053] In the CW voltage doubler rectifier circuit, the odd-numbered and even-numbered terms in the same stage have the same capacitance value, and the two positive and negative symmetrical CW voltage doubler rectifier circuits constitute a single-phase positive and negative bidirectional voltage doubler rectifier circuit. The final capacitance value of the entire positive and negative bidirectional voltage doubler rectifier circuit is as follows.

[0054]

[0055] in, The capacitor value represents the forward voltage doubler circuit in a single-phase bidirectional voltage doubler rectifier circuit. This represents the capacitor value of the negative voltage doubler rectifier circuit in the positive and negative bidirectional voltage doubler rectifier circuit.

[0056] Therefore, when the positive and negative bidirectional voltage doubler rectifier circuit meets the capacitance value assignment, the ripple and voltage drop of the entire module will be further reduced.

[0057] Based on the above analysis, the capacitor configuration for the 8x voltage multiplier circuit is as follows: = = = =2C, = = = =C.

[0058] The generality of the design method described in this invention is as follows: The design criteria given above are applicable to positive and negative bidirectional voltage doubler rectifier circuits of any level n.

[0059] Example 2: Optimization Design and Verification of CW 8x Voltage Multiplier Circuit Based on PSIM Simulation This embodiment uses an eight-times voltage multiplier (n=2) circuit as an example to demonstrate the simulation verification process of the design described in Embodiment 1.

[0060] 2.1 Design Goal: Optimization Figure 2 The dynamic performance of the bidirectional octet rectifier circuit shown is illustrated.

[0061] 2.2 Capacitor Parameter Design: The baseline value for the final stage capacitor is set as C = 2.5 nF. Therefore, the optimized capacitor value is: = = = =2C=5 nF; = = = =C=2.5nF.

[0062] For ease of comparison, two traditional schemes are defined: Scheme A (all capacitors are 5 nF) and Scheme B (all capacitors are 2.5 nF). The capacitor values ​​and average output voltage parameters are shown in Table 1.

[0063] Table 1

[0064] 2.3 Simulation Setup: Build the simulation in PSIM software. Figure 3 The simulation model shown.

[0065] The input voltage is a sine wave with a frequency of 20 kHz and a peak value of 20 kV; the equivalent resistance of the capacitor is 10Ω; the diode has a reverse recovery time of 25ns and a forward voltage drop of 0.3V; the output resistance is 10Ω. 6 KΩ.

[0066] 2.4 Comparison of Simulation Results: (1) Average output voltage: such as Figure 5 As shown, the average steady-state output voltage of the present invention is higher than that of Scheme A and Scheme B.

[0067] (2) Start-up stabilization time: such as Figure 4 and Figure 6As shown, the time to achieve voltage stability in the present invention is shorter than that of scheme A with a larger capacitance value and close to that of scheme B with a smaller capacitance value, thus achieving a balance between fast start-up and low ripple.

[0068] (3) Different loads and input conditions: such as Figure 7 and Figure 8 As shown, under different load resistances (105KΩ and 106KΩ) and different peak input voltages (10 kV, 15 kV, 20 kV), the average output voltage of the present invention is always higher than that of the traditional scheme with equivalent capacitors at each stage, proving its robustness.

[0069] Example 3: Fabrication and Experimental Testing of a Graded Capacitor Voltage Multiplier Module This embodiment further verifies the practical effect of the method of the present invention by fabricating a physical module.

[0070] 3.1 Module Construction: Construct three 8x voltage rectifier modules.

[0071] Module M1 adopts a traditional design with all capacitors being 2 nF. Module M2 adopts a traditional design with all capacitors being 10 nF. Module M3 adopts the hierarchical design of this invention. The capacitor values ​​of module M3 are based on the proportions in Example 2. Due to the deviation between the actual capacitor values ​​and the ideal capacitor values, it is impossible to strictly follow the multiple relationship described in Example 2 during the actual value selection process; they can only be as close as possible. The actual capacitor values ​​are shown in Table 2: = =3C=10 nF; = =2C=6.8nF, = =C=3.3nF.

[0072] Table 2

[0073] 3.2 Test Method: [The following is a list of test methods and procedures, which are not translated as they are not part of the Figure 9 The voltage divider method shown uses the same inverter module and transformer to drive three modules. The voltage divider resistors R1 = 1MΩ and R2 = 1GΩ. The voltage V across R1 is measured using a high-precision multimeter. m Then the module output voltage for:

[0074] 3.3 Test Results: Figure 10 , Figure 11 For comparison of actual output voltage values, after a period of power-on, the average output voltage of module M3 is greater than that of module M1. Under the same input conditions, the actual output voltage of module M3 of this invention is comparable to or even slightly better than that of module M2 using a traditional large capacitor solution.

[0075] In terms of volume and size, the M2 module adopts the same capacitor values ​​for each level, and its volume and weight are larger than those of the M3 module with the graded differentiated capacitor configuration scheme. This proves that the present invention achieves the same or even better output performance with a lower overall capacitor cost.

[0076] In summary, this application focuses on the positive and negative bidirectional voltage doubler rectifier circuit in a portable X-ray machine, proposing a graded differentiated capacitor configuration method. This method optimizes capacitor values ​​to meet the requirements of small size in portable X-ray machines while minimizing voltage drop. Based on the interstage charge transfer and charging / discharging characteristics, capacitors are non-equally allocated. Simulation analysis is used to compare and analyze key voltage output drop indicators, improving the high-voltage output quality of portable X-ray machines under lightweight conditions. This provides a reference for parameter optimization and engineering design of voltage doubler rectifier modules in portable X-ray machines.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for optimizing the design parameters of a stepped capacitor configuration voltage multiplier module in a portable cold cathode X-ray source, characterized in that, Includes the following steps: S1: Determine the number of stages n on one side of the positive and negative bidirectional voltage doubler rectifier circuit; S1: According to a preset capacitance ratio, assign capacitance values ​​to each stage of the capacitors in the circuit; wherein, the capacitance ratio is configured such that, from the output terminal to the input terminal of the circuit, the capacitance values ​​of each stage of the capacitor increase sequentially, and the ratio of the capacitance value of the i-th stage capacitor to the capacitance value C of the last stage capacitor is (n-i+1):1, where i=1,2,…,n, and the i-th stage contains two symmetrical capacitors with the same capacitance value; S3. Using circuit simulation software, establish a simulation model of the voltage doubler rectifier module based on the capacitance parameters allocated in step S2. S4. Run the simulation to obtain and evaluate the voltage drop performance index of the simulation model.

2. The design method according to claim 1, characterized in that, The bidirectional voltage multiplier rectifier circuit is an octet rectifier circuit, n=2, with 2 stages for positive and 2 stages for negative; the specific capacitor ratio is as follows: The capacitance of both the positive and negative voltage multipliers in the first stage is 2C. The capacitance of both capacitors in the second stage, for both the positive and negative voltage multipliers, is C.

3. The design method according to claim 1, characterized in that, The preset capacitance ratio is obtained by: establishing a charge transfer model for the positive and negative bidirectional voltage doubler rectifier circuit, and constructing an optimization function with the goal of minimizing the total voltage drop; under the constraint that the sum of the total capacitance values ​​is a constant, solving for the extreme values ​​of the optimization function to obtain the capacitance ratio.

4. The design method according to claim 3, characterized in that, The Lagrange multiplier method is used to solve for the extrema of the optimization function.

5. The design method according to claim 3, characterized in that, The optimization function F has the following form: Where Q is the amount of charge delivered to the load by the final stage capacitor in a single cycle, C1, C2, …, C 2n Let C be the capacitance value of each capacitor in the circuit, numbered sequentially from top to bottom and from left to right. 2i-1 = C 2i (i=1,…,n).

6. A graded capacitor configuration voltage multiplier module for a portable cold cathode X-ray source, characterized in that, It is applied to portable X-ray machines and includes a positive and negative bidirectional voltage multiplier rectifier circuit. The capacitance values ​​of each stage of the circuit are determined using the design method described in any one of claims 1 to 5. The circuit specifically includes: Input power supply, providing low-voltage DC power; The positive and negative bidirectional voltage doubler rectifier circuit uses multiple cascaded voltage doubler units to boost the input voltage to the required high voltage output. The capacitor configuration unit sets up multiple capacitors through a hierarchical and differentiated configuration method. The capacitor values ​​at each level are calculated according to the Lagrange optimization method to minimize the load voltage drop. The output port provides a stable high-voltage DC output for use with X-ray tubes. The capacitance values ​​in the capacitor configuration unit satisfy the following relationship: Among them, C i Let C be the capacitance of the i-th stage. total k is the total capacitance. i To optimize the proportional coefficients of each stage of capacitors obtained from the calculation.

7. The voltage multiplier module according to claim 6, wherein, The voltage doubler rectifier circuit includes multiple cascaded capacitor units, and the capacitance value of each capacitor unit is configured differently according to optimization rules to reduce output ripple and load voltage drop.

8. The voltage multiplier module according to claim 6, wherein, The capacitor configuration unit calculates the optimal capacitor value using the Lagrange optimization method, thereby minimizing the output voltage ripple under the constraint of total capacitor capacity.

9. A portable X-ray machine, characterized in that, It includes a high-voltage power supply module, which comprises the voltage doubler rectifier module as described in claim 8.

10. The voltage multiplier module parameter optimization design method or the graded capacitor configuration voltage multiplier module according to claim 1 or 6, characterized in that, The circuit simulation software is PSIM.

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