A method and system for integrating a dc-dc converter with a so-lcf

Abstract

This invention relates to the field of power electronics technology and provides a method for integrating a DC-DC converter and an SO-LCF (Self-Converting Circuit). The method includes: identifying the circuit structure based on the steady-state operation of the DC-DC converter; dividing the circuit into a constant voltage path (VCP) and a non-constant voltage path (CO-VCP) based on whether it meets the constant voltage characteristic; inserting inductors and capacitors at the boundary between VCP and CO-VCP to obtain several candidate integration topologies; verifying whether the DC-DC converter in each candidate integration topology can operate normally; and eliminating candidate integration topologies that cannot operate normally to obtain the integrated circuit of the DC-DC converter and SO-LCF and its derivative circuits. This method improves the efficiency and versatility of the integrated design of DC-DC converters and SO-LCFs.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and specifically to a method and system for integrating a DC-DC converter with an SO-LCF. Background Technology

[0002] Since its inception, DC-DC conversion technology has been widely used in numerous fields such as communication equipment, computers, and new energy vehicles, and also occupies an important position in key areas such as industrial control and aerospace. With the rapid development of electronic technology, the requirements for power conversion efficiency, stability, and anti-interference capabilities are increasing, and filtering technology in DC-DC converters has gradually become a focus of attention for researchers both domestically and internationally. A DC-DC converter system mainly consists of two core parts: the main conversion circuit and the filtering circuit. In-depth research on this technology has significant practical implications for improving the performance of electronic equipment and promoting the development of related industries.

[0003] In DC-DC converters, second-order LC filters (SO-LCFs) are typically used to suppress high-frequency switching noise and reduce input-output ripple. A second-order LC filter consists of an inductor (… ) and capacitor ( The LC pair, composed of an inductor and a capacitor, works by using the impedance of the inductor to high-frequency current and the bypassing effect of the capacitor to high-frequency voltage to jointly suppress high-frequency noise. When a current containing high-frequency noise flows through the inductor, the inductor generates an induced electromotive force that impedes the change in current, thus attenuating the high-frequency components. Simultaneously, the capacitor guides the high-frequency noise voltage to ground, further reducing the impact of noise on the output signal. The integrated design of the filter and converter is crucial to ensuring overall performance. This requires a systematic integration method to ensure that the filter circuit and the main conversion circuit work together to achieve effective noise suppression and ripple reduction. Furthermore, different application scenarios have different requirements for filter performance; therefore, the integration method should also be able to explore diverse filter configurations to adapt to different operating conditions.

[0004] The integrated design of DC-DC converters and second-order LC filters can utilize sophisticated digital simulation tools to explore integration schemes through extensive simulation experiments by building detailed circuit models. However, since converter circuits often contain analog switching devices, this approach requires complex modeling and simulation during the design process, increasing the difficulty and time required for development. Furthermore, the integrated schemes obtained through this method are often specific to DC-DC converters with particular circuit topologies and specific second-order LC filter integration methods, lacking systematic derivative circuits and making them difficult to generalize and apply. In scenarios with different engineering application requirements, similar repetitive operations may be required, resulting in low efficiency. Additionally, it may lead to compatibility issues when applied to different types of converters. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to improve the efficiency and versatility of the integrated design of DC-DC converter and SO-LCF.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] This invention provides a method for integrating a DC-DC converter with an SO-LCF, comprising the following steps: S1. Identify the circuit structure based on the steady-state operation of the DC-DC converter, and divide the constant voltage path VCP and the non-constant voltage path CO-VCP according to whether the constant voltage characteristic is met. S2. Insert an inductor at the boundary between VCP and CO-VCP. and capacitor Several candidate ensemble topologies were obtained; S3. Verify whether the DC-DC converter in each candidate integrated topology can operate normally. After eliminating the candidate integrated topologies that cannot operate normally, the integrated circuits of DC-DC converter and SO-LCF and their derivative circuits are obtained.

[0008] S4. Verify the DC-DC converter and SO-LCF integrated circuits and their derivative circuits obtained in step S3 using digital simulation tools, and select DC-DC converters and SO-LCF integrated circuits that meet the requirements of different engineering applications.

[0009] Further, step S1 includes the following steps: S11. Under given input voltage, load conditions and switching frequency operating parameters, bring the DC-DC converter into steady-state operation. S12. Analyze each port, node and energy storage element in the converter circuit, and select the input port, output port and capacitor element with voltage holding capability under steady-state conditions as candidate objects. S13. For each candidate object, the voltage across its terminals is sampled during one or more complete switching cycles, its steady-state average voltage is calculated, and the corresponding voltage ripple amplitude is evaluated. When the voltage ripple amplitude is less than a preset threshold relative to its steady-state average voltage, the candidate object is determined to have constant voltage characteristics under steady-state conditions and is identified as a voltage constant component VCC. S14. When one or more VCCs are combined in series, and the series structure maintains constant voltage characteristics under steady-state conditions, the series structure is considered as a VCP. S15. The remaining circuit parts of the DC-DC converter other than the VCP are identified as CO-VCP.

[0010] Furthermore, the preset threshold is 1% to 5% of the steady-state average voltage.

[0011] Further, step S2 includes the following steps: S21. Define the nodes at the N boundaries between VCP and CO-VCP as follows: ,in ; S22, at any node series inductor ; S23, Capacitor One end is connected to the inductor Between Co-VCP and the other end, and any node. Connection; where, ; S24. Repeat steps S22 and S23 until all node combinations are traversed, and several candidate integrated topologies are obtained.

[0012] This invention also provides an integrated system of a DC-DC converter and an SO-LCF, which executes the above-described method during system operation and includes the following modules: The circuit structure partitioning module is used to identify the circuit structure based on the steady-state operation of the DC-DC converter, and to partition the constant voltage path VCP and the non-constant voltage path CO-VCP based on whether the constant voltage characteristic is met. LC-based embedded modules are used to insert inductors at the boundary between VCP and CO-VCP. and capacitor Several candidate ensemble topologies were obtained; The circuit topology verification module is used to verify whether the DC-DC converter in each candidate integrated topology can operate normally. After eliminating the candidate integrated topologies that cannot operate normally, the integrated circuits of DC-DC converter and SO-LCF and their derivative circuits are obtained.

[0013] The application screening module is used to verify the DC-DC converter and SO-LCF integrated circuits and their derivative circuits obtained by the circuit topology verification module through digital simulation tools, and to screen out the DC-DC converter and SO-LCF integrated circuits that meet the requirements of different engineering applications.

[0014] Furthermore, the circuit structure partitioning module performs the following operations: (1) Under given input voltage, load conditions and switching frequency operating parameters, make the DC-DC converter enter steady-state operation; (2) Analyze each port, node and energy storage element in the converter circuit, and select the input port, output port and capacitor element with voltage holding capability under steady state conditions as candidate objects; (3) For each candidate object, the voltage across its two ends is sampled during one or more complete switching cycles, its steady-state average voltage is calculated and the corresponding voltage ripple amplitude is evaluated; when the voltage ripple amplitude is less than a preset threshold relative to its steady-state average voltage, the candidate object is determined to have constant voltage characteristics under steady-state conditions and is identified as a constant voltage component VCC. (4) When one or more VCCs are combined in series, and the series structure maintains constant voltage characteristics under steady-state conditions, the series structure is considered as a VCP. (5) The remaining circuit parts of the DC-DC converter other than the VCP are identified as CO-VCP.

[0015] Furthermore, the LC performs the following operations on the embedded module: (1) Define the nodes at the N boundaries between VCP and CO-VCP as follows: ,in ; (2) At any node series inductor ; (3) Capacitor One end is connected to the inductor Between Co-VCP and the other end, and any node. Connection; where, ; (4) Repeat steps S22 and S23 until all node combinations are traversed to obtain several candidate integrated topologies.

[0016] The present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the above-described method.

[0017] The advantages of this invention are: (1) This invention can integrate the DC-DC converter with SO-LCF by only dividing the DC-DC converter into parts, inserting inductors and connecting capacitors. The performance of the integrated filter can be controlled by the VCP characteristics of the converter, that is, the strength of the filtering effect is controllable, which reduces the design difficulty and cost of the DC-DC converter.

[0018] (2) The diversified configuration derivative mode of the present invention can obtain a variety of suitable SO-LCF configuration schemes according to the type of converter and the application scenario requirements. The operation steps are simple, the integration method is flexible, and the filtering performance can be controlled by the characteristics of the converter itself, which expands the integrated application range of DC-DC converter and SO-LCF and is conducive to realizing its high performance and diversified application. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the integration method of a DC-DC converter and SO-LCF according to the present invention; Figure 2 This is a schematic diagram of the circuit formed by the LC pair, VCP, and VCC of the present invention; Figure 3 This is a schematic diagram illustrating the steps of inserting LC pairs into the DC-DC converter of the present invention; Figure 4 This is a schematic diagram of the integration of the Buck converter of the present invention with VCP and SO-LCF at the input port; Figure 5 This is a schematic diagram of the integration of the Buck converter of the present invention with VCP and SO-LCF as input and output ports. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 To address the issues of limited SO-LCF configuration, lack of systematic integration methods, and difficulty in balancing filtering effectiveness and core performance in existing DC-DC converters, this embodiment provides an integration method for DC-DC converters and SO-LCF. It clarifies that LC pairs are a core condition for effective SO-LCF, and by inserting LC pairs into the converter, it ensures that the converter's key performance is not affected. Simultaneously, it explores new configurations, providing diverse and high-performance filtering solutions for various DC-DC converters to meet the needs of modern electronic devices.

[0022] The specific implementation process of the method is as follows: Figure 1 As shown, it includes the following steps: S1. Based on the steady-state operation of the DC-DC converter, the circuit structure is identified, and based on whether the voltage constant characteristic is met, the voltage constant path (VCP) and the non-voltage constant path (CO-VCP) are divided. The specific implementation includes the following steps: S11. Under given input voltage, load conditions and switching frequency operating parameters, bring the DC-DC converter into steady-state operation. S12. Analyze each port, node and energy storage element in the converter circuit, and select the input port, output port and capacitor element with voltage holding capability under steady-state conditions as candidate objects. S13. For each candidate, the voltage across its terminals is sampled during one or more complete switching cycles, its steady-state average voltage is calculated, and the corresponding voltage ripple amplitude is evaluated. When the voltage ripple amplitude is less than a preset threshold relative to its steady-state average voltage, the candidate is determined to have constant voltage characteristics under steady-state conditions and is identified as a voltage constant component (VCC). The preset threshold can be set according to specific application requirements, preferably 1% to 5% of the steady-state average voltage.

[0023] S14. When one or more VCCs are combined in series, and the series structure maintains constant voltage characteristics under steady-state conditions, the series structure is considered as a VCP. S15. The remaining circuit parts of the DC-DC converter other than the VCP are identified as CO-VCP.

[0024] S2. Insert an inductor at the boundary between VCP and CO-VCP. and capacitor Several candidate ensemble topologies were obtained; such as Figure 2 As shown, the specific implementation method includes the following steps: S21. Define the nodes at the N boundaries between VCP and CO-VCP as follows: ,in ; S22, at any node series inductor ; S23, Capacitor One end is connected to the inductor Between Co-VCP and the other end, and any node. Connection; where, ; S24. Repeat steps S22 and S23 until all node combinations are traversed, and several candidate integrated topologies are obtained.

[0025] The entire integration process of the LC pair is as follows: like Figure 3 As shown, firstly, at any node of the DC-DC converter, such as Insert an inductor at the location This causes the inductor to be connected in series between VCP and CO-VCP, at which point a new node is added. In practical applications of the Buck transformer, for example, inserting at its input-side node... Then, a new current path node is formed. Inductance It has the property of impeding high-frequency current changes; when a current containing high-frequency noise flows through it... At this time, high-frequency components are attenuated due to the impedance of the inductor, achieving initial high-frequency noise suppression. New node added. For capacitor The connection provides the necessary interface, enabling LC to ( , It can form a complete filter structure, creating conditions for subsequent high-efficiency filtering.

[0026] Then, the capacitor Connected to the node With nodes Between these points, the capacitor is connected in parallel with the CO-VCP section. After connection, it is necessary to confirm whether the converter can operate normally. If it can, then the LC pair ( , It forms a closed loop with VCP, thus being integrated into the DC-DC converter as an SO-LCF.

[0027] In this embodiment, a Buck converter is used as an example, such as Figure 4 and Figure 5 As shown, when the input port is considered a single VCC, it can be directly used as the VCP; when both the input and output ports simultaneously meet the constant voltage condition, they can also be connected in series as multiple VCCs to form a VCP, and the remaining circuit parts are naturally divided into Co-VCP. Through this method, the VCP and Co-VCP in the DC-DC converter are determined, providing a foundation for the subsequent integration of LC pairs. Using the above method, five SO-LCF schemes can be derived in the Buck converter. For example... Figure 5 As shown, taking the integration of a Buck converter with VCP and SO-LCF as input and output ports as an example, Connected between the input and output nodes, the circuit structure shown in the diagram intuitively demonstrates that the voltage stress it bears is the difference between the input and output voltages. Compared to traditional solutions, this significantly reduces the requirement for the capacitor's rated voltage, not only lowering costs but also enabling miniaturized circuit design. The same method can be applied to Boost and Buck-Boost converters. By combining their unique topology characteristics and appropriately selecting the VCP node, five and six effective solutions can be obtained, respectively.

[0028] S3. Verify whether the DC-DC converter in each candidate integrated topology can operate normally. After eliminating the candidate integrated topologies that cannot operate normally, the integrated circuits of DC-DC converter and SO-LCF and their derivative circuits are obtained.

[0029] S4. Verify the DC-DC converter and SO-LCF integrated circuits and their derivative circuits obtained in step S3 using digital simulation tools, and select DC-DC converters and SO-LCF integrated circuits that meet the requirements of different engineering applications.

[0030] In this embodiment, the core operating condition of the SO-LCF is that the inductor and capacitor in the LC pair must form a closed loop with a VCP. This VCP is formed by one or more VCCs connected in series, and its overall structure has a constant average voltage under steady-state conditions.

[0031] like Figure 2 As shown, when the LC pair and VCP form a circuit, according to Kirchhoff's voltage law, no additional high-frequency voltage components are introduced into the circuit except for the capacitor voltage ripple. Because the capacitor has energy storage characteristics, the voltage ripple across its terminals can be designed to be extremely small, thereby making the AC voltage across the inductor approximately zero, and the inductor current ripple is also significantly reduced, achieving an effective high-frequency current filtering function.

[0032] Therefore, as long as VCC is correctly identified and VCP is constructed in the DC-DC converter, and LC pairs are introduced according to the integration method proposed in this embodiment, the introduced LC pairs can be guaranteed to work effectively as SO-LCF, without affecting the original voltage gain and steady-state operating characteristics of the converter.

[0033] Regarding performance retention after integration, the number and characteristics of the original basic loops (NL) of the converter remain unchanged. The number of basic loops follows the general formula in circuit topology: NL=B. N+1 (where B is the number of branches in the original converter topology and N is the number of nodes in the original converter topology), this type of basic loop is the core independent voltage loop for power transmission in the converter, determining its Kirchhoff voltage law constraints. Due to the filter inductor... Satisfying the volt-second balance characteristic, its average voltage is 0. When analyzing the steady-state average performance of the converter, it can be equivalent to a short-circuit state. The addition of an LC pair only increases the total number of basic loops in the converter by one (this new loop is...). , The independent filter loop formed with VCP does not affect the voltage distribution, current transport, or Kirchhoff's voltage law constraints of the original NL basic loops. Therefore, the average voltage of each power component of the converter remains unchanged, and the core performance indicator of voltage gain is completely consistent with the original topology. Meanwhile, the insertion... Although the post-transformer increases the total number of nodes to N+1 due to the addition of one node, the total number of basic cut sets increases from the original N. The number increases from 1 to N, but the original N remains the same. One fundamental cut set is completely preserved, and its properties remain unchanged. Due to capacitance... The average current is 0, which can be considered equivalent to an open circuit in the circuit. This does not change the original current distribution of the cut set, and therefore the average current of each component remains unchanged. Based on these two points, the key performance characteristics of the converter, such as voltage gain and average voltage / current, are not affected by the integrated SO-LCF, ensuring that the converter maintains its original operating performance and stability while achieving good filtering effects.

[0034] Example 2 Based on the same inventive concept, this embodiment provides an integrated system of a DC-DC converter and an SO-LCF, including the following modules: The circuit structure partitioning module is used to identify the circuit structure based on the steady-state operation of the DC-DC converter, and to partition the constant voltage path VCP and the non-constant voltage path CO-VCP based on whether the constant voltage characteristic is met. LC-based embedded modules are used to insert inductors at the boundary between VCP and CO-VCP. and capacitor Several candidate ensemble topologies were obtained; The circuit topology verification module is used to verify whether the DC-DC converter in each candidate integrated topology can operate normally. After eliminating the candidate integrated topologies that cannot operate normally, the integrated circuits of DC-DC converter and SO-LCF and their derivative circuits are obtained.

[0035] The application screening module is used to verify the DC-DC converter and SO-LCF integrated circuits and their derivative circuits obtained by the circuit topology verification module through digital simulation tools, and to screen out the DC-DC converter and SO-LCF integrated circuits that meet the requirements of different engineering applications.

[0036] The circuit structure partitioning module performs the following operations: (1) Under given input voltage, load conditions and switching frequency operating parameters, make the DC-DC converter enter steady-state operation; (2) Analyze each port, node and energy storage element in the converter circuit, and select the input port, output port and capacitor element with voltage holding capability under steady state conditions as candidate objects; (3) For each candidate object, the voltage across its two ends is sampled during one or more complete switching cycles, its steady-state average voltage is calculated and the corresponding voltage ripple amplitude is evaluated; when the voltage ripple amplitude is less than a preset threshold relative to its steady-state average voltage, the candidate object is determined to have constant voltage characteristics under steady-state conditions and is identified as a constant voltage component VCC. (4) When one or more VCCs are combined in series, and the series structure maintains constant voltage characteristics under steady-state conditions, the series structure is considered as a VCP. (5) The remaining circuit parts of the DC-DC converter other than the VCP are identified as CO-VCP.

[0037] The LC performs the following operations on the embedded module: (1) Define the nodes at the N boundaries between VCP and CO-VCP as follows: ,in ; (2) At any node series inductor ; (3) Capacitor One end is connected to the inductor Between Co-VCP and the other end, and any node. Connection; where, ; (4) Repeat steps S22 and S23 until all node combinations are traversed to obtain several candidate integrated topologies.

[0038] It should be further explained that, based on the same inventive concept, this embodiment also provides a computer storage medium storing a computer program, which is executed by a processor to perform the method described in embodiment 1.

[0039] For the purposes of this specification, "computer storage medium" can be any means capable of containing, storing, communicating, propagating, or transmitting a program for use in or in conjunction with an instruction execution system, apparatus, or device. More specific examples of computer storage media (a non-exhaustive list) include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, a computer storage medium can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0040] It should be understood that the various parts of this embodiment can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0041] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for integrating a DC-DC converter with an SO-LCF, characterized in that, Includes the following steps: S1. Identify the circuit structure based on the steady-state operation of the DC-DC converter, and divide the constant voltage path VCP and the non-constant voltage path CO-VCP according to whether the constant voltage characteristic is met. S2. Insert an inductor at the boundary between VCP and CO-VCP. and capacitor Several candidate ensemble topologies were obtained; S3. Verify whether the DC-DC converter in each candidate integrated topology can operate normally. After eliminating the candidate integrated topologies that cannot operate normally, the integrated circuits of DC-DC converter and SO-LCF and their derivative circuits are obtained.

2. The method for integrating a DC-DC converter and an SO-LCF according to claim 1, characterized in that, The integration method further includes: S4. Verify the DC-DC converter and SO-LCF integrated circuits and their derivative circuits obtained in step S3 using digital simulation tools, and select DC-DC converters and SO-LCF integrated circuits that meet the requirements of different engineering applications.

3. The method for integrating a DC-DC converter and an SO-LCF according to claim 1, characterized in that, Step S1 includes the following steps: S11. Under given input voltage, load conditions and switching frequency operating parameters, bring the DC-DC converter into steady-state operation. S12. Analyze each port, node and energy storage element in the converter circuit, and select the input port, output port and capacitor element with voltage holding capability under steady-state conditions as candidate objects. S13. For each candidate object, the voltage across its terminals is sampled during one or more complete switching cycles, its steady-state average voltage is calculated, and the corresponding voltage ripple amplitude is evaluated. When the voltage ripple amplitude is less than a preset threshold relative to its steady-state average voltage, the candidate object is determined to have constant voltage characteristics under steady-state conditions and is identified as a voltage constant component VCC. S14. When one or more VCCs are combined in series, and the series structure maintains constant voltage characteristics under steady-state conditions, the series structure is considered as a VCP. S15. The remaining circuit parts of the DC-DC converter other than the VCP are identified as CO-VCP.

4. The method for integrating a DC-DC converter and an SO-LCF according to claim 3, characterized in that, The preset threshold is 1% to 5% of the steady-state average voltage.

5. The method for integrating a DC-DC converter and an SO-LCF according to claim 1, characterized in that, Step S2 includes the following steps: S21. Define the nodes at the N boundaries between VCP and CO-VCP as follows: ,in ; S22, at any node series inductor ; S23, Capacitor One end is connected to the inductor Between Co-VCP and the other end, and any node. Connection; where, ; S24. Repeat steps S22 and S23 until all node combinations are traversed, and several candidate integrated topologies are obtained.

6. An integrated system of a DC-DC converter and an SO-LCF, characterized in that, Includes the following modules: The circuit structure partitioning module is used to identify the circuit structure based on the steady-state operation of the DC-DC converter, and to partition the constant voltage path VCP and the non-constant voltage path CO-VCP based on whether the constant voltage characteristic is met. LC-based embedded modules are used to insert inductors at the boundary between VCP and CO-VCP. and capacitor Several candidate ensemble topologies were obtained; The circuit topology verification module is used to verify whether the DC-DC converter in each candidate integrated topology can operate normally. After eliminating the candidate integrated topologies that cannot operate normally, the integrated circuits of DC-DC converter and SO-LCF and their derivative circuits are obtained.

7. The integrated system of DC-DC converter and SO-LCF according to claim 6, characterized in that, The system also includes: The application screening module is used to verify the DC-DC converter and SO-LCF integrated circuits and their derivative circuits obtained by the circuit topology verification module through digital simulation tools, and to screen out the DC-DC converter and SO-LCF integrated circuits that meet the requirements of different engineering applications.

8. The integrated system of DC-DC converter and SO-LCF according to claim 1, characterized in that, The circuit structure partitioning module performs the following operations: (1) Under given input voltage, load conditions and switching frequency operating parameters, make the DC-DC converter enter steady-state operation; (2) Analyze each port, node and energy storage element in the converter circuit, and select the input port, output port and capacitor element with voltage holding capability under steady state conditions as candidate objects; (3) For each candidate object, the voltage across its two ends is sampled during one or more complete switching cycles, its steady-state average voltage is calculated and the corresponding voltage ripple amplitude is evaluated; when the voltage ripple amplitude is less than a preset threshold relative to its steady-state average voltage, the candidate object is determined to have constant voltage characteristics under steady-state conditions and is identified as a constant voltage component VCC. (4) When one or more VCCs are combined in series, and the series structure maintains constant voltage characteristics under steady-state conditions, the series structure is considered as a VCP. (5) The remaining circuit parts of the DC-DC converter other than the VCP are identified as CO-VCP.

9. The integrated system of a DC-DC converter and SO-LCF according to claim 1, characterized in that, The LC performs the following operations on the embedded module: (1) Define the nodes at the N boundaries between VCP and CO-VCP as follows: ,in ; (2) At any node series inductor ; (3) Capacitor One end is connected to the inductor Between Co-VCP and the other end, and any node. Connection; where, ; (4) Repeat steps S22 and S23 until all node combinations are traversed to obtain several candidate integrated topologies.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-5.

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