Flyback transformer design method and system, electronic equipment and readable medium
The flyback transformer design method using automated calculation and pattern recognition solves the problem of low efficiency in traditional design, enabling efficient and accurate transformer design in new energy vehicle controllers, and adapting to complex circuit conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHUZHOU CRRC TIMES ELECTRIC CO LTD COMMERCIAL VEHICLE ELECTRIC DRIVE BRANCH
- Filing Date
- 2024-10-15
- Publication Date
- 2026-04-24
AI Technical Summary
Traditional flyback transformer design methods are inefficient, cannot accurately match key parameters, and are difficult to adapt to the complex circuit conditions of new energy vehicle controllers.
The system employs an automated calculation method to receive input parameters, distinguish the operating modes of the flyback transformer, and calculate key parameters such as primary inductance, peak current, and turns ratio to generate design parameters, supporting various winding configurations and parallel transformer designs.
This improves the accuracy and efficiency of the design, reduces human error, and ensures that the transformer operates efficiently and stably in the new energy vehicle controller, adapting to different load conditions.
Smart Images
Figure CN121919971A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy vehicle motor controllers, specifically to a design method, system, electronic device, and readable medium for a flyback transformer. Background Technology
[0002] In the control systems of new energy vehicles, power electronic devices such as IGBTs (Insulated Gate Bipolar Transistors) and SiC (Silicon Carbide) modules are key components, playing a central role in the efficient and high-performance drive of electric vehicles. These devices typically operate in high-voltage and high-current environments, thus their drive power requirements are particularly stringent, especially in terms of safety and reliability.
[0003] Traditional power supply solutions face several challenges, particularly in effectively isolating high-voltage and low-voltage sections to prevent electrical faults and protect user safety. Transformer isolation is a common solution, with flyback switching power supplies favored for their simple structure and wide power supply applicability. Flyback switching power supplies achieve electrical isolation between input and output through a small, high-frequency transformer, while providing the necessary voltage and current conversion.
[0004] However, designing a flyback transformer is a technical challenge, especially in matching key parameters such as the primary-to-secondary turns ratio, leakage inductance, and primary inductance to meet specific application requirements. Furthermore, the power consumption of the drive circuit, the characteristics of the power supply chip, and actual operating conditions (such as parallel transformers and load imbalance) also significantly affect the transformer's performance.
[0005] Traditional design methods are typically static, relying on experience and trial and error, which is not only inefficient but also fails to guarantee design optimization and accuracy. Therefore, developing an efficient and accurate flyback transformer design method that can meet the stringent requirements of modern electric vehicle controllers through precise calculations is a crucial need in the industry. Summary of the Invention
[0006] This invention provides a design method, system, electronic device, and readable medium for flyback transformers. Its purpose is to solve the problems of low efficiency and difficulty in adapting to complex circuit conditions in traditional design methods. This invention simplifies the design process and improves the accuracy and reliability of the design through automation and optimized calculations.
[0007] To achieve the above objectives, the first aspect of the present invention provides a design method for a flyback transformer, comprising the following steps:
[0008] Receive the input parameters required for flyback transformer design;
[0009] Based on the input parameters, calculate the maximum primary inductance of the flyback transformer in discontinuous conduction mode and the primary inductance at the minimum input voltage.
[0010] The operating mode of the flyback transformer is determined by comparing the primary inductance at the minimum input voltage with the primary inductance at the maximum input voltage.
[0011] If the flyback transformer operates in discontinuous conduction mode, calculate the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode.
[0012] If the flyback transformer operates in continuous conduction mode, calculate the peak current, turns ratio, and maximum duty cycle in continuous conduction mode.
[0013] The design parameters for the flyback transformer are generated based on the calculation results, and the relevant parameter information is recorded.
[0014] Furthermore, methods for determining the operating mode of a flyback transformer include:
[0015] Compare the primary-side inductance at the minimum input voltage with the primary-side inductance at the maximum input voltage;
[0016] When the primary inductance at the minimum input voltage is less than the maximum primary inductance, the flyback transformer operates in continuous conduction mode.
[0017] When the primary inductance at the minimum input voltage is greater than the maximum primary inductance, the flyback transformer operates in discontinuous conduction mode.
[0018] Furthermore, the input parameters include winding parameters and initial input parameters, wherein,
[0019] The method for obtaining the winding parameters includes: selecting the winding type according to the power requirements; and obtaining the winding parameters based on the selected winding type, wherein the winding parameters include the winding output voltage.
[0020] The initial input parameters include at least the number of flyback transformers in parallel, transformer efficiency, minimum operating voltage, reflected voltage, power supply frequency, output power, maximum operating voltage, desired maximum duty cycle, and diode voltage drop.
[0021] Furthermore, the maximum primary inductance and the primary inductance at the minimum input voltage of the flyback transformer are calculated using the following formulas:
[0022]
[0023]
[0024] In the formula, Lm is the maximum primary inductance in discontinuous conduction mode, L is the primary inductance at the minimum input voltage, n is the number of flyback transformers connected in parallel, and V min For minimum operating voltage, V or Let f be the reflected voltage, f be the power supply frequency, P be the output power, u be the transformer efficiency, and D be the output voltage. max This represents the desired maximum duty cycle.
[0025] Furthermore, if the flyback transformer operates in discontinuous conduction mode, the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode are calculated using the following formulas:
[0026]
[0027]
[0028]
[0029] In the formula, I P D is the peak current in discontinuous conduction mode, N is the turns ratio in discontinuous conduction mode, and D is the peak current. min For the minimum duty cycle in discontinuous conduction mode, V max For the maximum operating voltage, V o V is the output voltage of the winding. f For the diode voltage drop, V or This is the reflected voltage.
[0030] Furthermore, if the flyback transformer operates in continuous conduction mode, the peak current, turns ratio, and maximum duty cycle in continuous conduction mode are calculated using the following formulas:
[0031]
[0032]
[0033]
[0034] In the formula, I P ′ is the peak current in continuous conduction mode, N′ is the turns ratio in continuous conduction mode, and D max ′ represents the maximum duty cycle in continuous conduction mode.
[0035] Furthermore, it also includes exporting the calculation results as an Excel file containing relevant parameters of the transformer circuit.
[0036] To achieve the above objectives, a second aspect of the present invention provides a design system for a flyback transformer, comprising the following modules:
[0037] The receiving module is used to receive the input parameters required for flyback transformer design;
[0038] The first calculation module is used to calculate the maximum primary inductance of the flyback transformer in discontinuous conduction mode and the primary inductance under the minimum input voltage based on the input parameters.
[0039] The comparison module is used to compare the primary inductance at the minimum input voltage with the maximum primary inductance to determine the operating mode of the flyback transformer.
[0040] The second calculation module calculates the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode if the flyback transformer is operating in discontinuous conduction mode.
[0041] The third calculation module calculates the peak current, turns ratio, and maximum duty cycle in continuous conduction mode if the flyback transformer is operating in continuous conduction mode.
[0042] The parameter generation module is used to generate design parameters for flyback transformers based on calculation results and record relevant parameter information.
[0043] To achieve the above objectives, a third aspect of the present invention provides an electronic device, comprising: at least one memory and at least one processor;
[0044] The at least one memory is used to store a readable program;
[0045] The at least one processor is used to call the readable program to execute the design method.
[0046] To achieve the above objectives, a fourth aspect of the present invention provides a computer-readable medium storing computer instructions that, when executed by a processor, cause the processor to perform the method described thereon.
[0047] Beneficial effects
[0048] Compared to existing technologies, this invention provides a design method, system, electronic equipment, and readable medium for flyback transformers. Through an integrated automated calculation process, it accurately receives and processes input parameters to calculate key transformer characteristics, such as primary inductance and peak current. This method automatically distinguishes the operating modes of the flyback transformer (discontinuous conduction mode and continuous conduction mode) and accurately calculates the turns ratio and duty cycle based on the selected mode. This ensures that the designed transformer performs as expected under the desired operating conditions in practical applications. Furthermore, the method records all relevant parameter information, facilitating subsequent verification and adjustments. In this way, this invention significantly improves design efficiency and accuracy, reduces time consumption and human error, thereby optimizing the entire design process and making it more suitable for the precise and reliable transformer requirements of modern power electronic equipment. Attached Figure Description
[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0050] Figure 1 This is a flowchart of a flyback transformer design method disclosed in an embodiment of the present invention.
[0051] Figure 2 This is a design principle block diagram of a flyback transformer disclosed in an embodiment of the present invention.
[0052] Figure 3 This is an interface diagram that runs on design software, as disclosed in an embodiment of the present invention.
[0053] Figure 4 This is an interface diagram of selecting the same name terminal in design software, as disclosed in an embodiment of the present invention.
[0054] Figure 5 This is a first part of a table diagram of an Excel export result disclosed in an embodiment of the present invention.
[0055] Figure 6 This is a second part of the table diagram of an Excel export result disclosed in an embodiment of the present invention.
[0056] Figure 7 This is a diagram of the verification software interface for a flyback power transformer disclosed in an embodiment of the present invention.
[0057] Figure 8 This is a block diagram for determining the operating mode of a flyback transformer, as disclosed in an embodiment of the present invention.
[0058] Figure 9 This is a schematic diagram of an electronic device disclosed in an embodiment of the present invention.
[0059] Reference numerals: 10, storage; 20, processor. Detailed Implementation
[0060] like Figure 1 , Figure 2 As shown, the present invention provides a design method for a flyback transformer, comprising the following steps:
[0061] Step S100: Receive the input parameters required for the flyback transformer design;
[0062] Specific input parameters typically include winding parameters and initial input parameters, among which,
[0063] The method for obtaining winding parameters includes: selecting the winding type according to power requirements; and obtaining the winding parameters based on the selected winding type. The winding parameters include the winding output voltage V. o;
[0064] The initial input parameters shall at least include the number of flyback transformers connected in parallel n, the transformer efficiency u, the minimum operating voltage V min , the reflected voltage V or , the power supply frequency f, the output power P, the maximum operating voltage V max , the desired maximum duty cycle D max , the diode voltage drop V f .
[0065] Step S200: Based on the input parameters, calculate the maximum primary inductance of the flyback transformer in the discontinuous conduction mode and the primary inductance at the minimum input voltage;
[0066] The operating modes of a flyback switching power supply are divided into the discontinuous conduction mode (DCM mode) and the continuous conduction mode (CCM mode). When designing a flyback power transformer, it is necessary to distinguish the transformer operating mode. The maximum primary inductance Lm of the transformer in the DCM mode and the primary inductance L at the minimum input voltage (maximum duty cycle) can be calculated.
[0067] It should be noted that the discontinuous conduction mode (DCM mode) means that within a switching cycle, the inductor current always reaches 0, which means the inductor is properly "reset", that is, when the power switch is closed, the inductor current is zero. The continuous conduction mode (CCM mode) means that within a switching cycle, the inductor current never reaches 0, or the inductor is never "reset", which means that within a switching cycle, the inductor current magnetic flux never returns to 0, and when the power tube is closed, there is still current flowing through the coil.
[0068] Step S300: Compare the primary inductance at the minimum input voltage with the maximum primary inductance to determine the operating mode of the flyback transformer;
[0069] In this step, the operating mode of the flyback transformer is determined by comparing the relationship between the primary inductance L under the minimum input voltage condition and the theoretical maximum primary inductance Lm. These two inductance values reflect the performance of the transformer under different load and voltage conditions:
[0070] Discontinuous conduction mode (DCM): If the inductance L under the actual operating conditions is greater than the maximum inductance Lm, i.e., (L > Lm), the transformer will operate in the DCM mode. In this mode, the inductor current returns to zero at the end of each switching cycle, giving the inductor the opportunity to be "reset" again in each cycle.
[0071] Continuous conduction mode (CCM): If (L < Lm), the transformer will operate in the CCM mode, and the inductor current does not return to zero within the switching cycle and remains continuously flowing.
[0072] In the design of flyback transformers for motor controllers in new energy vehicles, it is crucial to analyze and compare the primary inductance (L) at the minimum input voltage with the maximum primary inductance (Lm), as this step helps determine the operating mode of the flyback transformer: discontinuous conduction mode (DCM) or continuous conduction mode (CCM).
[0073] In flyback switching power supplies, the primary-side inductance is one of the key parameters, directly affecting the power supply's energy transfer efficiency and stability. The primary-side inductance determines the behavior of the inductor current during the switching cycle.
[0074] In a DCM (Distributed Circuit Management), the inductor current returns to zero before the switch is turned off during each switching cycle. This mode occurs when the load is light or the input voltage is high. The zero-current characteristic of the inductor allows the circuit to "reset" between switches, which helps reduce switching losses and improve efficiency, but at the same time causes increased fluctuations in the output voltage.
[0075] In a CCM (Continuous Current Management) circuit, the inductor current never returns to zero throughout the entire switching cycle. This means that the inductor retains a certain amount of stored energy after each switching operation, thus providing a smoother output voltage and higher power conversion efficiency. CCMs are typically suitable for heavy loads or low input voltage applications.
[0076] This analysis allows for the selection of the most suitable transformer and inductor parameters based on expected operating conditions and performance requirements, thereby ensuring the efficient and stable operation of the power supply.
[0077] Step S400: If the flyback transformer is operating in discontinuous conduction mode, calculate the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode.
[0078] If it is determined that the flyback transformer is operating in DCM mode, the following parameters will be calculated based on the specific requirements of this mode:
[0079] Peak current (I) P This is the maximum current value that an inductor can reach during a switching cycle.
[0080] Turns ratio (N): The ratio of the number of turns between the primary and secondary coils, determined based on the input voltage, output voltage, and peak current.
[0081] Minimum duty cycle (D) min ): The minimum switching duty cycle required to ensure stable operation of the transformer.
[0082] Step S500: If the flyback transformer is operating in continuous conduction mode, calculate the peak current, turns ratio, and maximum duty cycle in continuous conduction mode.
[0083] If the transformer is operating in CCM mode, corresponding calculations will be performed to determine:
[0084] Peak current (I) P ′): Similar to DCM mode.
[0085] Turns ratio (N′): Calculated based on current and voltage requirements in continuous mode.
[0086] Maximum duty cycle (D) max ′): The maximum duty cycle that a transformer can achieve without being overloaded.
[0087] Step S600: Generate the design parameters of the flyback transformer based on the calculation results, and record the relevant parameter information.
[0088] This step, based on previous calculations, generates the final transformer design parameters, including but not limited to inductance, turns ratio, duty cycle, and output voltage and current. All these parameters will be systematically recorded and exported in Excel spreadsheet format for subsequent manufacturing, testing, and verification processes.
[0089] In the calculation process, firstly, the maximum primary inductance Lm of the flyback transformer operating in discontinuous conduction mode (DCM) and the primary inductance L at the minimum input voltage are calculated using the following formulas:
[0090]
[0091] In the formula, Lm is the maximum primary inductance in discontinuous conduction mode, L is the primary inductance at the minimum input voltage, n is the number of flyback transformers connected in parallel, and V min For minimum operating voltage, V or Let f be the reflected voltage, f be the power supply frequency, P be the output power, u be the transformer efficiency, and D be the output voltage. max This represents the desired maximum duty cycle.
[0092] The second step is to compare the maximum primary inductance Lm with the primary inductance L at the minimum input voltage.
[0093] Third, if (L>Lm), the transformer will operate in discontinuous conduction mode (DCM mode). The peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode (DCM mode) are calculated using the following formulas:
[0094]
[0095] In the formula, I P D is the peak current in discontinuous conduction mode, N is the turns ratio in discontinuous conduction mode, and D is the peak current. min For the minimum duty cycle in discontinuous conduction mode, V max For the maximum operating voltage, V o V is the output voltage of the winding. fis the diode forward voltage drop, V or is the reflected voltage.
[0096] If (L < Lm), the transformer will operate in continuous conduction mode (CCM mode). The peak current, turns ratio, and maximum duty cycle in continuous conduction mode (CCM mode) are calculated using the following formulas:
[0097]
[0098]
[0099] Where, I P ′ is the peak current in continuous conduction mode, N′ is the turns ratio in continuous conduction mode, D max ′ is the maximum duty cycle in continuous conduction mode.
[0100] Preferably, when the transformer will operate in discontinuous conduction mode (DCM mode), the duty cycle D nom under the rated working voltage and the diode spike voltage V Dmax also need to be calculated. The calculation formula of the duty cycle D nom under the rated working voltage is basically the same as that of D min , and only need to change V max to V nom . The diode spike voltage V Dmax refers to the reflected voltage V or and the working voltage. Actually, this parameter does not exist on the input interface, and this parameter is split into the reflected voltage V or and the working voltage (V min , V nom , V max ).
[0101] Preferably, the input parameters also include the average current I o of the winding and the sum P2 of other transformer powers. These two parameters can be input either one of them and the output power P. When using the output power mode, the output power P needs to be obtained, and the average current I o and the sum P2 of other transformer powers are not required. When using the current voltage mode, the average current I o and the sum P2 of other transformer powers need to be obtained, and the total power P is calculated through these two parameters. In addition, the maximum working voltage and the rated working voltage are also required. These two parameters do not participate in the calculation of Lm and L. After obtaining L, the duty cycle D min of the maximum working voltage and the duty cycle D nom of the rated working voltage are calculated through these two parameters.
[0102] Based on the design method described above, MATLAB GUI programming software is used to design the software, which mainly includes two functions: design and calculation. For example... Figures 3-6 As shown, the design function allows users to input the required parameters given the drive power supply requirements, and then click the "Calculate" button to obtain transformer parameters such as primary inductance and turns ratio. Clicking the "Output Results" button generates an Excel spreadsheet to record the relevant transformer parameters. Incomplete or incorrect data will be automatically reported. The function is applicable to center-tapped / positive / negative voltage transformers with one winding and two secondary coil configurations, and can design transformers with up to eight windings.
[0103] The process begins by selecting the winding type and power calculation method based on power requirements, and then inputting relevant parameters for calculation. If DCM mode is selected, the system will continue execution and display the calculation results. The user can click the "Output Results" button, select the transformer's corresponding terminal, and export the results to Excel. If not in DCM mode, the system will ask whether to select CCM mode; if yes, CCM mode calculation will be performed and the results will also be displayed for export. If neither is selected, the system will display an error message.
[0104] It's important to note that after clicking the "Output Results" button, selecting the transformer's corresponding terminal determines the coupling direction between the transformer windings. Each transformer has a specific corresponding terminal. In a flyback transformer, assuming the primary winding's corresponding terminal is the positive power supply terminal, then the secondary winding's corresponding terminal is the negative power supply terminal. Selecting the transformer's corresponding terminal after outputting the results essentially restricts the coupling direction between the windings, ensuring that the positive and negative terminals of the transformer's input and output voltages match the intended values.
[0105] like Figures 7-8 In this design tool, users can close the design interface and open the calculation window by clicking the toggle button. This function allows for calculations of the operating state based on known transformer and power supply parameters. Users need to input key parameters such as operating voltage, primary inductance, and turns ratio. The system uses these inputs to calculate key operating parameters such as duty cycle, peak current, and output voltage, and can determine whether the transformer is operating in DCM or CCM mode. Furthermore, both the design and calculation interfaces are equipped with parameter explanation buttons, providing detailed explanations of the parameters for user understanding and use. Entering incorrect or incomplete data will trigger an automatic error reporting function to ensure the accuracy of the calculations. Additionally, the calculation results are verified. Finally, after the tool is programmed in the MATLAB GUI, it can be packaged as an app installation package for easy download and use by users.
[0106] The technical solution of this invention addresses the design of flyback transformers in new energy vehicle motor controllers, taking into account various practical circuit factors to ensure the accuracy and practicality of the transformer design. These factors mainly include:
[0107] During the design process, the possibility of transformers being used in parallel was considered, which would affect their electrical parameters, such as current carrying capacity and turns ratio. Parallel transformers require ensuring even load distribution across all transformers and proper thermal management. The design methodology specifically considers the leakage inductance and magnetic coupling effects of parallel transformers to ensure that each transformer can bear the current evenly during parallel operation, avoiding performance degradation or damage due to load imbalance. For load imbalance issues, the design methodology adapts to different load conditions by optimizing the transformer winding layout and selecting appropriate turns ratios. This design reduces electromagnetic interference and efficiency reduction caused by load imbalance. Considering the uneven current distribution that different output loads may cause, this invention employs winding technology or adds compensation circuits to balance the current, ensuring that the transformers maintain stable performance under different operating conditions.
[0108] The design software supports transformer design with center taps and various winding configurations. These features allow for flexible application of transformers in various circuit topologies, such as providing positive and negative voltage outputs. Center-tapped designs enable multiple voltage levels to be achieved within a single transformer, enhancing power supply design flexibility and reducing the number of external components, thereby lowering the overall system cost and complexity.
[0109] This design scheme comprehensively considers common power supply design issues such as parallel connection of various transformers and load imbalance, and supports multiple winding configurations. This makes the transformer design not only adaptable to a single application scenario but also widely adaptable to different system requirements. Furthermore, through the application of MATLAB GUI design software, designers can intuitively input parameters, quickly obtain the required transformer parameters, and verify the rationality of the design through calculation functions, thereby greatly improving design efficiency and accuracy.
[0110] This invention also provides a design system for a flyback transformer, comprising the following modules:
[0111] The receiving module is used to receive the input parameters required for flyback transformer design;
[0112] The first calculation module is used to calculate the maximum primary inductance of the flyback transformer in discontinuous conduction mode and the primary inductance under the minimum input voltage based on the input parameters.
[0113] The comparison module is used to compare the primary inductance at the minimum input voltage with the maximum primary inductance to determine the operating mode of the flyback transformer.
[0114] The second calculation module calculates the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode if the flyback transformer is operating in discontinuous conduction mode.
[0115] The third calculation module calculates the peak current, turns ratio, and maximum duty cycle in continuous conduction mode if the flyback transformer is operating in continuous conduction mode.
[0116] The parameter generation module is used to generate design parameters for flyback transformers based on calculation results and record relevant parameter information.
[0117] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.
[0118] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. For example... Figure 9 As shown, the electronic device includes a memory 10 and a processor 20; wherein the memory 10 is used to store a readable program, which is loaded and executed by the processor 20 to implement the design method as described above.
[0119] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0120] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.
[0121] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.
[0122] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0123] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks. It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0124] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.
Claims
1. A design method for a flyback transformer, characterized in that, Includes the following steps: Receive the input parameters required for flyback transformer design; Based on the input parameters, calculate the maximum primary inductance of the flyback transformer in discontinuous conduction mode and the primary inductance at the minimum input voltage. The operating mode of the flyback transformer is determined by comparing the primary inductance at the minimum input voltage with the primary inductance at the maximum input voltage. If the flyback transformer operates in discontinuous conduction mode, calculate the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode. If the flyback transformer operates in continuous conduction mode, calculate the peak current, turns ratio, and maximum duty cycle in continuous conduction mode. The design parameters for the flyback transformer are generated based on the calculation results, and the relevant parameter information is recorded.
2. The design method of the flyback transformer as described in claim 1, characterized in that, Methods for determining the operating mode of a flyback transformer include: Compare the primary-side inductance at the minimum input voltage with the primary-side inductance at the maximum input voltage; When the primary inductance at the minimum input voltage is less than the maximum primary inductance, the flyback transformer operates in continuous conduction mode. When the primary inductance at the minimum input voltage is greater than the maximum primary inductance, the flyback transformer operates in discontinuous conduction mode.
3. The design method for a flyback transformer as described in claim 1, characterized in that, The input parameters include winding parameters and initial input parameters, wherein, The method for obtaining the winding parameters includes: selecting the winding type according to the power requirements; and obtaining the winding parameters based on the selected winding type, wherein the winding parameters include the winding output voltage. The initial input parameters include at least the number of flyback transformers in parallel, transformer efficiency, minimum operating voltage, reflected voltage, power supply frequency, output power, maximum operating voltage, desired maximum duty cycle, and diode voltage drop.
4. The design method of the flyback transformer as described in claim 3, characterized in that, The formulas for calculating the maximum primary inductance and the primary inductance at the minimum input voltage of a flyback transformer operating in discontinuous conduction mode are as follows: In the formula, Lm is the maximum primary inductance in discontinuous conduction mode, L is the primary inductance at the minimum input voltage, n is the number of flyback transformers connected in parallel, and V min For minimum operating voltage, V or Let f be the reflected voltage, f be the power supply frequency, P be the output power, u be the transformer efficiency, and D be the output voltage. max This represents the desired maximum duty cycle.
5. The design method for a flyback transformer as described in claim 4, characterized in that, If the flyback transformer operates in discontinuous conduction mode, the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode are calculated using the following formulas: In the formula, I P D is the peak current in discontinuous conduction mode, N is the turns ratio in discontinuous conduction mode, and D is the peak current. min For the minimum duty cycle in discontinuous conduction mode, V max For the maximum operating voltage, V o V is the output voltage of the winding. f For the diode voltage drop, V or This is the reflected voltage.
6. The design method of the flyback transformer as described in claim 5, characterized in that, If the flyback transformer operates in continuous conduction mode, the peak current, turns ratio, and maximum duty cycle in continuous conduction mode are calculated using the following formulas: In the formula, I P ′ is the peak current in continuous conduction mode, N′ is the turns ratio in continuous conduction mode, and D max ′ represents the maximum duty cycle in continuous conduction mode.
7. The design method of the flyback transformer as described in claim 1, characterized in that, It also includes exporting the calculation results as an Excel file containing relevant parameters of the transformer circuit.
8. A design system for a flyback transformer, characterized in that, Includes the following modules: The receiving module is used to receive the input parameters required for flyback transformer design; The first calculation module is used to calculate the maximum primary inductance of the flyback transformer in discontinuous conduction mode and the primary inductance under the minimum input voltage based on the input parameters. The comparison module is used to compare the primary inductance at the minimum input voltage with the maximum primary inductance to determine the operating mode of the flyback transformer. The second calculation module calculates the peak current, turns ratio, and minimum duty cycle in discontinuous conduction mode if the flyback transformer is operating in discontinuous conduction mode. The third calculation module calculates the peak current, turns ratio, and maximum duty cycle in continuous conduction mode if the flyback transformer is operating in continuous conduction mode. The parameter generation module is used to generate design parameters for flyback transformers based on calculation results and record relevant parameter information.
9. An electronic device, characterized in that, include: At least one memory and at least one processor; The at least one memory is used to store a readable program; The at least one processor is configured to invoke the readable program to execute the design method according to any one of claims 1-7.
10. A computer-readable medium, characterized in that, The computer-readable medium stores computer instructions that, when executed by a processor, cause the processor to perform the design method according to any one of claims 1-7.