Control Method, System and Storage Medium Based on Flyback Multistage Isolated Power Supply

Abstract

The present invention provides a control method, system and storage medium for a flyback multi-stage isolated power supply, which is applied to a flyback multi-stage isolated transistor drive power supply circuit. The circuit generates multiple groups of isolated power supplies through a set of flyback power supply modules and at least two groups of isolated power supply topology modules, greatly reducing the number of components used. The present invention can adjust the input power supply voltage of the flyback power supply module according to the total voltage required by the power supply load; and then control the conduction of the topology analog switch of the isolated power supply topology module according to the grading turn ratio of the isolated power supply topology module, so as to combinatorially output multiple isolated power supplies that meet the power supply voltage required by the power supply load. The present invention realizes the output of multiple groups of isolated power supplies in an isolated circuit with fewer core components, improving the integration and portability of the isolated power supply.

Description

Technical Field

[0001] The present invention relates to the field of isolated power supply control, and more particularly, to a control method, system, and storage medium based on a flyback multi-stage isolated power supply. Background Art

[0002] In today's era, the new energy industry is developing extremely rapidly and has become a key development direction in the global energy field. Among many key devices in the new energy industry, IGBT single tubes and silicon carbide single tubes, as core power devices, are widely used in various power electronic devices, such as on-vehicle chargers for new energy vehicles, photovoltaic inverters, and wind power converters. During the operation of these devices, to ensure that the transistors can work stably, efficiently, and precisely, there are a large number of strict requirements for the transistor isolated drive power supply.

[0003] However, the existing transistor isolated drive power supply technology has many obvious defects. On the one hand, when traditional technologies implement multiple groups of isolated drive power supplies, they often require a large number of components, which not only greatly increases the production cost of the equipment but also sharply increases the complexity of the entire power supply system, raising the difficulty of quality control during the production process and the later maintenance cost. On the other hand, the use of a large number of components makes it extremely difficult to layout and route the PCB, requires more space, and makes it difficult to reduce the overall size of the equipment, severely restricting the integration and portability. In application scenarios with high requirements for space and portability, the limitations of traditional technologies become more obvious. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a control method, system, and storage medium based on a flyback multi-stage isolated power supply, which is applied to a flyback multi-stage isolated transistor drive power supply circuit. The circuit generates multiple groups of isolated power supplies through a group of flyback power supply modules and at least two groups of isolated power supply topology modules, greatly reducing the number of components used. The present invention can adjust the input power supply voltage of the flyback power supply module according to the total voltage required by the power supply load; then, according to the grading turn ratio of the isolated power supply topology module, control the conduction of the topology analog switch of the isolated power supply topology module to combine and output multiple isolated power supplies that meet the power supply voltage required by the power supply load. The present invention realizes the output of multiple groups of isolated power supplies in an isolated circuit with fewer core components, improving the integration and portability of the isolated power supply.

[0005] The first aspect of the present invention provides a control method based on a flyback multi-stage isolated power supply, and the method includes:

[0006] Obtain a first voltage information sequence;

[0007] Determine first input voltage information according to the first voltage information sequence;

[0008] Configure the power supply voltage of the flyback power supply module according to the first input voltage information;

[0009] Determine a sequence of hierarchical voltage information according to the first input voltage information;

[0010] Switch the first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence.

[0011] In this solution, the determination of the first input voltage information according to the first voltage information sequence is specifically as follows:

[0012] Determine first boundary information and second boundary information according to the first voltage information sequence;

[0013] Obtain first voltage sum information according to the first boundary information according to a preset voltage sum calculation strategy;

[0014] Judge whether the first boundary information is greater than the second boundary information;

[0015] If so, set the first input voltage information according to the first voltage sum information;

[0016] If not, calculate the average value of the first boundary information and the second boundary information to obtain third boundary information;

[0017] Obtain second voltage sum information according to the third boundary information according to a preset voltage sum calculation strategy;

[0018] Judge whether the second voltage sum information is greater than the first voltage sum information;

[0019] If so, set the second boundary information according to the third boundary information;

[0020] If not, set the first boundary information according to the third boundary information, and update the first voltage sum information according to the second voltage sum information.

[0021] In this solution, the determination of the first boundary information and the second boundary information according to the first voltage information sequence is specifically as follows:

[0022] Determine second voltage information according to the first voltage information sequence;

[0023] Set the second boundary information according to the second voltage information;

[0024] Obtain a preset hierarchical threshold;

[0025] Calculate the downward rounded ratio of the second voltage information to the hierarchical threshold to obtain first ratio information;

[0026] Set the first boundary information according to the first ratio information.

[0027] In this solution, the voltage and calculation strategy are specifically as follows:

[0028] Obtain the first unit voltage information;

[0029] Select the first voltage information in the first voltage information sequence in a preset order;

[0030] Calculate the ceiling ratio of the first voltage information to the first unit voltage information to obtain the second ratio information;

[0031] Obtain the third voltage information according to the product of the second ratio information and the first unit voltage information;

[0032] Accumulate the third voltage information in sequence to obtain the voltage sum information.

[0033] In this solution, the determination of the hierarchical voltage information sequence according to the first input voltage information is specifically as follows:

[0034] Obtain the first hierarchical turn ratio information, the first intermediate hierarchical turn ratio information, the second intermediate hierarchical turn ratio information, and the second hierarchical turn ratio information;

[0035] Determine the first hierarchical voltage information according to the first input voltage information and the first hierarchical turn ratio information;

[0036] Determine the first intermediate hierarchical voltage information according to the first hierarchical voltage information and the first intermediate hierarchical turn ratio information;

[0037] Determine the second intermediate hierarchical voltage information according to the first intermediate hierarchical voltage information and the second intermediate hierarchical turn ratio information;

[0038] Determine the second hierarchical voltage information according to the second intermediate hierarchical voltage information and the second hierarchical turn ratio information;

[0039] Obtain the hierarchical voltage information sequence according to the first hierarchical voltage information, the first intermediate hierarchical voltage information, the second intermediate hierarchical voltage information, and the second hierarchical voltage information.

[0040] In this solution, the switching of the first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence is specifically as follows:

[0041] Extract the first voltage information in the first voltage information sequence in sequence to obtain the fourth voltage information;

[0042] According to the fourth voltage information, compare it with the grading voltages in the grading voltage information sequence in the preset comparison order;

[0043] Judge whether the fourth voltage information is greater than the grading voltage;

[0044] If so, disconnect the conduction switch of the isolated power supply topology module corresponding to the grading voltage;

[0045] If not, calculate the difference between the fourth voltage information and the next grading voltage after the grading voltage for updating the fourth voltage information;

[0046] Judge whether the fourth voltage information exceeds 0;

[0047] If so, continue to execute the comparison step of the fourth voltage information and the grading voltage information sequence;

[0048] If not, extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information until all the first voltage information in the first voltage information sequence is compared.

[0049] The second aspect of the present invention provides a control system based on a flyback multi-stage isolated power supply, including a control method program for the flyback multi-stage isolated power supply. When the control method program for the flyback multi-stage isolated power supply is executed by the processor, the following steps are implemented:

[0050] Obtain the first voltage information sequence;

[0051] Determine the first input voltage information according to the first voltage information sequence;

[0052] Configure the power supply voltage of the flyback power supply module according to the first input voltage information;

[0053] Determine the grading voltage information sequence according to the first input voltage information;

[0054] Switch the first topology analog switch according to the first voltage information sequence and the grading voltage information sequence.

[0055] In this solution, the determining the first input voltage information according to the first voltage information sequence is specifically:

[0056] Determine the first boundary information and the second boundary information according to the first voltage information sequence;

[0057] According to the first boundary information, obtain the first voltage sum information according to the preset voltage and calculation strategy;

[0058] Judge whether the first boundary information is greater than the second boundary information;

[0059] If so, set the first input voltage information according to the first voltage and the information.

[0060] If not, calculate the average value of the first boundary information and the second boundary information to obtain the third boundary information.

[0061] According to the third boundary information, obtain the second voltage sum information according to a preset voltage and calculation strategy.

[0062] Determine whether the second voltage sum information is greater than the first voltage sum information.

[0063] If so, set the second boundary information according to the third boundary information.

[0064] If not, set the first boundary information according to the third boundary information, and update the first voltage sum information according to the second voltage sum information.

[0065] In this solution, the switching of the first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence is specifically as follows:

[0066] Extract the first voltage information in the first voltage information sequence in sequence to obtain the fourth voltage information.

[0067] According to the fourth voltage information, compare it with the hierarchical voltages in the hierarchical voltage information sequence in sequence according to a preset comparison order.

[0068] Determine whether the fourth voltage information is greater than the hierarchical voltage.

[0069] If so, disconnect the conduction switch of the isolation power topology module corresponding to the hierarchical voltage.

[0070] If not, calculate the difference between the fourth voltage information and the next-level hierarchical voltage of the hierarchical voltage to update the fourth voltage information.

[0071] Determine whether the fourth voltage information exceeds 0.

[0072] If so, continue to execute the comparison step of the fourth voltage information and the hierarchical voltage information sequence.

[0073] If not, extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information until all the first voltage information in the first voltage information sequence has been compared.

[0074] A third aspect of the present invention provides a computer-readable storage medium, which includes a control method program for a flyback multi-stage isolated power supply. When the control method program for the flyback multi-stage isolated power supply is executed by a processor, the steps of the control method for the flyback multi-stage isolated power supply as described in any one of the above are implemented.

[0075] The present invention provides a control method, system and storage medium for a flyback multi-stage isolated power supply, which is applied to a flyback multi-stage isolated transistor drive power supply circuit. The circuit generates multiple groups of isolated power supplies through a group of flyback power modules and at least two groups of isolated power supply topology modules, greatly reducing the number of components used. The present invention can adjust the input power supply voltage of the flyback power module according to the total voltage required by the power supply load; and then control the conduction of the topology analog switch of the isolated power supply topology module according to the grading turn ratio of the isolated power supply topology module, for combining and outputting multiple isolated power supplies that meet the power supply voltages required by the power supply load. The present invention realizes the output of multiple groups of isolated power supplies in an isolated circuit with fewer core components, improving the integration and portability of the isolated power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope.

[0077] Figure 1 Shows a connection topology diagram of a flyback multi-stage isolated transistor drive power supply circuit;

[0078] Figure 2 Shows a flowchart of the control method for the flyback multi-stage isolated power supply of the present invention;

[0079] Figure 3 Shows a flowchart for confirming the first input voltage information provided by an embodiment of the present invention;

[0080] Figure 4 Shows a flowchart for switching the first topology analog switch provided by an embodiment of the present invention;

[0081] Figure 5 Shows a block diagram of the control system for the flyback multi-stage isolated power supply of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0082] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0083] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense, unless explicitly defined in the embodiments of the present invention.

[0084] The "first", "second" and similar terms used in the embodiments of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Terms such as "a", "one" or "the" do not denote a quantity limitation either, but mean that there is at least one. Similarly, words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms "connected" or "coupled" etc. are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the methods in the embodiments of the present invention do not necessarily have to be carried out precisely in order. On the contrary, they can be carried out in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or one or several steps can be removed from these processes.

[0085] In addition, the functional modules in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0086] Figure 1 A connection topology diagram of a flyback multi-stage isolated transistor drive power supply circuit is shown.

[0087] As Figure 1 shown, a flyback multi-stage isolated transistor drive power supply circuit includes:

[0088] a group of flyback power modules and at least two groups of isolated power topology modules;

[0089] The flyback power module uses a PWM chip to generate a flyback power supply, and then drives the power supply through at least one transistor and is connected to the primary of the transformer;

[0090] The isolated power supply topology module is an isolated drive power supply constituted by the secondary of a transformer.

[0091] It should be noted that the flyback power supply module 101 generates a PWM signal by a PWM chip. The transistor controls a voltage signal according to the PWM signal. Combining with the power supply VBUS+ / VBUS-, a flyback power supply is formed, and then the flyback power supply voltage is connected to the primary of the transformer. The isolated power supply topology module is set as a multi-stage isolated power supply topology. Among them, each stage of drive power supply includes at least two sets of topology modules; for example, in Figure 1 the first first-level topology 1021, the second first-level topology 1022, the first second-level topology 1031, the second second-level topology 1032, and the third second-level topology 1033. That is to say, an isolated power supply topology is constituted by the secondary of the transformer. Among them, the secondary of the transformer has at least 2 windings. As Figure 1 shown, the first-level topology includes 2 windings, and the second-level topology includes 3 windings. Therefore, as long as the lower magnetic core wound by the transformer skeleton is not saturated, multiple isolated drive power supplies can be generated through the multi-stage topology. In practical applications, the number of windings is inversely proportional to the turn ratio, that is, the more the number of windings, the smaller the turn ratio of each winding in the secondary; for example, when there are 2 sets of windings, the secondary turn ratio is set to 2:1. In addition, for the convenience of description, hereinafter, the isolated power supply circuit is used to refer to the flyback multi-stage isolated transistor drive power supply circuit.

[0092] Figure 2 The flowchart of the control method of the present invention based on the flyback multi-stage isolated power supply is shown.

[0093] As Figure 2 shown, the first aspect of the present invention discloses a control method based on a flyback multi-stage isolated power supply. The method includes:

[0094] S202, obtaining a first voltage information sequence;

[0095] S204, determining first input voltage information according to the first voltage information sequence;

[0096] S206, configuring the power supply voltage of the flyback power supply module according to the first input voltage information;

[0097] S208, determining a hierarchical voltage information sequence according to the first input voltage information;

[0098] S210, switching a first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence.

[0099] It should be noted that the first voltage information is the power supply voltage value required by the power supply load; the first voltage information sequence is a sequence composed of the power supply voltage values required by the loads powered by the same set of isolated power supply circuits; the first input voltage information is the input power supply voltage value of the isolated power supply circuit; the hierarchical voltage information sequence is the output voltage value of each stage of the isolated power supply topology of the isolated power supply circuit; the first topology analog switch is the conduction switch of the isolated power supply topology, which is used to form the power supply voltage required for the power supply load.

[0100] In this embodiment, according to the voltage requirements of the power supply load, the input power supply voltage value of the isolated power supply circuit is configured, and then combined with the switching situation of each stage of the isolated power supply topology module of the isolated power supply circuit, the conduction situation of the isolated power supply topology module is switched. First, collect the power supply voltage required by each power supply load to form a voltage value sequence, that is, the first voltage information sequence; among them, the above-mentioned power supply load is powered by the isolated power supply generated by the same set of isolated power supply circuits. Secondly, combined with the circuit configuration of the isolated power supply circuit, according to the set input voltage calculation method, the input power supply voltage of the isolated power supply circuit is obtained, where the isolated power supply generated by the input power supply voltage can not only meet the power supply requirements of all power supply loads, but also is the lowest voltage value when meeting the power supply requirements. Then, according to the circuit configuration of the isolated power supply circuit, combined with the input power supply voltage of the configured isolated power supply circuit, the output voltage value of each stage of the isolated power supply topology is obtained, which is used to form the hierarchical voltage information sequence. Finally, according to the magnitude relationship between the power supply voltage value required by the power supply load and the output voltage value of each stage of the isolated power supply topology, the topology analog switches of each stage of the isolated power supply topology are switched, that is, the conduction situation of the isolated power supply topology is switched, which is used to combine into the power supply voltage required by the power supply load and the isolated power supplies.

[0101] Figure 3 The flowchart for confirming the first input voltage information provided by the embodiment of the present invention is shown.

[0102] According to the embodiment of the present invention, as Figure 3 shown, determining the first input voltage information according to the first voltage information sequence is specifically:

[0103] S302, determine the first boundary information and the second boundary information according to the first voltage information sequence;

[0104] S304, according to the first boundary information, obtain the first voltage sum information according to the preset voltage sum calculation strategy;

[0105] S306, determine whether the first boundary information is greater than the second boundary information;

[0106] S308, if so, set the first input voltage information according to the first voltage sum information;

[0107] S310. If not, calculate the average value of the first boundary information and the second boundary information to obtain the third boundary information;

[0108] S312. According to the third boundary information, obtain the second voltage sum information according to a preset voltage and calculation strategy;

[0109] S314. Determine whether the second voltage sum information is greater than the first voltage sum information;

[0110] S316. If so, set the second boundary information according to the third boundary information;

[0111] S318. If not, set the first boundary information according to the third boundary information, and update the first voltage sum information according to the second voltage sum information.

[0112] It should be noted that the first boundary information is the lower boundary of the minimum grading voltage selection range in the calculation process of the first input voltage information; the second boundary information is the upper boundary of the minimum grading voltage selection range in the calculation process of the first input voltage information; the first voltage sum information is the minimum value of the sum of the power supply voltages required by the power supply load in the calculation process of the first input voltage information; the second voltage sum information is the sum of the power supply voltages required by the power supply load calculated according to any minimum grading voltage in the calculation process of the first input voltage information; the minimum grading voltage is the minimum value of the grading voltages required to be provided by the same group of isolated power supply circuits according to the power supply voltage value required by the power supply load.

[0113] In this embodiment, the minimum input power supply voltage value that meets the power supply requirements of the isolated power supply circuit is obtained through a preset voltage value search strategy. First, according to the power supply voltage value required by the power supply load, the upper and lower boundaries of the minimum grading voltage are determined due to the restricted value range. Then, the voltage value corresponding to the lower boundary is used as the minimum grading voltage value, and according to a preset voltage and calculation strategy, the minimum value of the sum of the power supply voltages required by the power supply load is obtained, denoted as the first voltage sum information. Finally, the following loop judgment process is executed:

[0114] Determine whether the first boundary information is greater than the second boundary information. If the first boundary information is greater than the second boundary information, it indicates that the value boundaries have overlapped, that is, the value range is missing. At this time, set the first input voltage information according to the first voltage and information, and end the above loop judgment process. If the first boundary information is not greater than the second boundary information, select the minimum grading voltage value from the value range included by the upper and lower boundaries; as an implementation manner, calculate the average value of the first boundary information and the second boundary information, that is, the third boundary information, as the minimum grading voltage value. Then, according to the voltage value corresponding to the third boundary information, obtain the calculated value of the total supply voltage value, that is, the second voltage sum information, according to the preset voltage sum calculation strategy, and use it to compare the magnitude relationship between the second voltage sum information and the first voltage sum information. When the second voltage sum information is greater than the first voltage sum information, it means that the total supply voltage calculated according to the voltage value corresponding to the third boundary is larger than the previous calculated value. At this time, lower the second boundary information according to the third boundary information. When the second voltage sum information is not greater than the first voltage sum information, it means that the total supply voltage calculated according to the voltage value corresponding to the third boundary is smaller than the previous calculated value. At this time, first update the first voltage sum information according to the second voltage sum information to save the smaller value of the supply voltage, and then increase the second boundary information according to the third boundary information. Finally, execute the above loop judgment process again according to the magnitude relationship between the first boundary information and the second boundary information.

[0115] According to an embodiment of the present invention, the determining the first boundary information and the second boundary information according to the first voltage information sequence is specifically as follows:

[0116] Determine the second voltage information according to the first voltage information sequence;

[0117] Set the second boundary information according to the second voltage information;

[0118] Obtain a preset grading threshold;

[0119] Calculate the downward rounded ratio of the second voltage information to the grading threshold to obtain the first ratio information;

[0120] Set the first boundary information according to the first ratio information.

[0121] It should be noted that the second voltage information is the maximum value in the first voltage information sequence; the grading threshold is the number of grades of the isolation power supply topology in the isolation power supply circuit. In this embodiment, according to the voltage requirements of the power supply load and the configuration of the isolation power supply circuit, the first boundary information and the second boundary information are set. First, the voltage maximum value is extracted from the first voltage information sequence, that is, the second voltage information, and then the upper boundary, that is, the second boundary information, is set according to the second voltage information. Then, the ratio of the second voltage information to the grading threshold is calculated, and the result of rounding down the ratio is used as the first ratio information; then the lower boundary, that is, the first boundary information, is set according to the first ratio information.

[0122] According to the embodiment of the present invention, the voltage sum calculation strategy is specifically as follows:

[0123] Obtain the first unit voltage information;

[0124] Select the first voltage information in the first voltage information sequence in turn according to the preset order;

[0125] Calculate the ceiling ratio of the first voltage information to the first unit voltage information to obtain the second ratio information;

[0126] Obtain the third voltage information according to the product of the second ratio information and the first unit voltage information;

[0127] Accumulate the third voltage information in turn to obtain the voltage sum information.

[0128] It should be noted that the first unit voltage information is the minimum grading voltage required by the isolation power supply circuit when calculating the voltage sum, and at least includes the voltage values corresponding to the first boundary information and the third boundary information; the third voltage information is the voltage value that the isolation power supply circuit can provide when the power supply load is the first voltage information; the voltage sum information is the total voltage that the isolation power supply circuit needs to provide with the first unit voltage information as the minimum grading voltage. In this embodiment, first, the first voltage information is selected in turn according to the order of the first voltage information sequence, and the result of rounding up the ratio of the first voltage information to one unit voltage information is used as the second ratio information. Then, the product of the second ratio information and the first unit voltage information is calculated to obtain the third voltage information, which is used to represent the minimum power supply voltage value of the isolation power supply circuit to meet the power supply requirements of the power supply load according to the current minimum grading voltage. Finally, the sum of the third voltage information that each power supply load can obtain is calculated to obtain the voltage sum information.

[0129] According to the embodiment of the present invention, determining the grading voltage information sequence according to the first input voltage information is specifically as follows:

[0130] Obtain the first grading turns ratio information, the first intermediate grading turns ratio information, the second intermediate grading turns ratio information, and the second grading turns ratio information;

[0131] Determine the first grading voltage information according to the first input voltage information and the first grading turns ratio information;

[0132] Determine the first intermediate grading voltage information according to the first grading voltage information and the first intermediate grading turns ratio information;

[0133] Determine the second intermediate grading voltage information according to the first intermediate grading voltage information and the second intermediate grading turns ratio information;

[0134] Determine the second grading voltage information according to the second intermediate grading voltage information and the second grading turns ratio information;

[0135] Obtain the grading voltage information sequence according to the first grading voltage information, the first intermediate grading voltage information, the second intermediate grading voltage information, and the second grading voltage information.

[0136] It should be noted that the first grading turns ratio information is the number of gradings of the first-stage grading circuit in the isolated power supply circuit; the second grading turns ratio information is the number of gradings of the last-stage grading circuit in the isolated power supply circuit; the first intermediate grading turns ratio information and the second intermediate grading turns ratio information are the number of gradings of the intermediate grading circuits located between the first-stage grading circuit and the last-stage grading circuit in the isolated power supply circuit, where the first intermediate grading circuit is in the front stage of the second intermediate grading circuit.

[0137] In this embodiment, a calculation process for the grading voltage is provided. In practical applications, to facilitate the control of the grading voltage range and combination, the turns ratio of each stage will be set to the same value, usually 2. For example, assuming that the input power supply voltage value of the isolated power supply circuit is 32 units, the isolated power supply circuit has 5-stage isolated power supply topologies and the grading turns ratio of each topology is 2, the voltage of the first stage is 16 units, the voltage of the second stage is 8 units, the voltage of the third stage is 4 units, the voltage of the fourth stage is 2 units, and the voltage of the fifth stage is 1 unit. Therefore, the grading voltage information sequence is [16, 8, 4, 2, 1].

[0138] Figure 4 Shows the switching flow chart of the first topology analog switch provided by the embodiment of the present invention.

[0139] According to the embodiment of the present invention, as Figure 4 shown, the switching of the first topology analog switch according to the first voltage information sequence and the grading voltage information sequence is specifically:

[0140] S402, sequentially extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information;

[0141] S404, according to the fourth voltage information, sequentially compare it with the hierarchical voltage of the hierarchical voltage information sequence in a preset comparison order;

[0142] S406, determine whether the fourth voltage information is greater than the hierarchical voltage;

[0143] S408, if so, disconnect the conduction switch of the isolated power topology module corresponding to the hierarchical voltage;

[0144] S410, if not, calculate the difference between the fourth voltage information and the next-level hierarchical voltage of the hierarchical voltage for updating the fourth voltage information;

[0145] S412, determine whether the fourth voltage information exceeds 0;

[0146] S402, if so, continue to execute the comparison step of the fourth voltage information and the hierarchical voltage information sequence;

[0147] S414, if not, extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information until all the first voltage information in the first voltage information sequence is compared.

[0148] It should be noted that the fourth voltage information is the voltage operation value in the calculation process of the switching topology switch for the power supply load. In this embodiment, the isolation power supply for the power supply load is configured by sequentially switching the conduction switches of the isolation power supply topology module. As an implementation manner, the first voltage information is extracted from the first voltage information sequence in sequence according to the voltage value required by the power supply load to set the fourth voltage information. First, according to the hierarchical voltage information sequence, the hierarchical voltage is obtained in ascending order for comparison with the fourth voltage information. When the fourth voltage information is greater than the above hierarchical voltage, the conduction switch of the isolation power supply topology module corresponding to the hierarchical voltage is disconnected to indicate that the topology voltage division is not performed through the transformer. When the fourth voltage information is not greater than the above hierarchical voltage, the conduction state of the conduction switch of the isolation power supply topology module corresponding to the hierarchical voltage is maintained, and the difference between the fourth voltage information and the next-level hierarchical voltage of the hierarchical voltage is calculated to update the fourth voltage information; for example, the fourth voltage information is 5, the current hierarchical voltage is 8, and the next-level hierarchical voltage is 4. Since the fourth voltage information is less than the current hierarchical voltage, at this time, the difference between the fourth voltage information and the next-level hierarchical voltage is calculated (5 - 4 = 1), and the fourth voltage information is updated to 1. Then, it is judged whether the fourth voltage information exceeds 0; if the fourth voltage information exceeds 0, it means that the isolation power supply for the power supply load needs to be continued, and the comparison step between the fourth voltage information and the hierarchical voltage information sequence is continued; if the fourth voltage information does not exceed 0, it means that the isolation power supply configuration of the current power supply load is completed, and the isolation power supply for the next power supply load is configured.

[0149] It is worth mentioning that it further includes:

[0150] Obtain the second voltage information sequence;

[0151] Calculate the difference between the elements of the first voltage sequence and the second voltage information sequence in sequence according to the sequence order to obtain the first difference sequence;

[0152] Judge whether the first differences in the first difference sequence are all greater than a preset difference threshold;

[0153] If so, lower the duty cycle parameter of the PWM chip.

[0154] It should be noted that the second voltage information is the power supply voltage value obtained by the power supply load; the obtaining of the second voltage information sequence is a voltage sequence composed of the second voltage information. In this embodiment, the operating parameters of the PWM chip are adjusted by the difference between the power supply value and the power demand value of the power supply load to finely adjust the flyback voltage of the isolation power supply circuit, and the safety of the circuit operation is improved by lowering the voltage. When the differences between the power supply value and the power demand value of the power supply load are all greater than the preset difference threshold, the operating parameters of the PWM can be lowered to achieve the effect of finely adjusting the flyback voltage of the isolation power supply circuit.

[0155] It is worth mentioning that it also includes:

[0156] Obtain the first current information;

[0157] Judge whether the first current information exceeds a preset current threshold;

[0158] If so, disconnect the first topological analog switch of the first stage.

[0159] It should be noted that the first current information is the operating current of the flyback power module in the isolated power supply circuit. When the current is too high, there is a problem of burning out the transistors in the flyback power module. Therefore, in this embodiment, the safety of the isolated power supply circuit is also improved by monitoring the current.

[0160] It is worth mentioning that it also includes:

[0161] Obtain the first current information;

[0162] According to the first current information and the first input voltage information, obtain the first power information;

[0163] Judge whether the first power information exceeds a preset power threshold;

[0164] If so, lower the first input voltage information or lower the duty cycle parameter of the PWM chip.

[0165] It should be noted that according to the operating current and input power supply voltage in the flyback power module, the operating power of the isolated power supply circuit is calculated, that is, the first power information. In this embodiment, when the first power information exceeds the preset power threshold, by reducing the input voltage or lowering the operating parameters of the PWM chip, the purpose of controlling the operating power of the isolated power supply circuit is achieved, and the safety of the isolated power supply circuit is improved.

[0166] Figure 5 The block diagram of the control system of the present invention based on the flyback multi-stage isolated power supply is shown.

[0167] As Figure 5 shown, the second aspect of the present invention discloses a control system 5 based on a flyback multi-stage isolated power supply, including a memory 51 and a processor 52. The memory includes a control method program based on the flyback multi-stage isolated power supply. When the control method program based on the flyback multi-stage isolated power supply is executed by the processor, the following steps are implemented:

[0168] Obtain the first voltage information sequence;

[0169] According to the first voltage information sequence, determine the first input voltage information;

[0170] Configure the power supply voltage of the flyback power supply module according to the first input voltage information;

[0171] Determine a hierarchical voltage information sequence according to the first input voltage information;

[0172] Switch the first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence.

[0173] It should be noted that the first voltage information is the power supply voltage value required by the power supply load; the first voltage information sequence is a sequence composed of the power supply voltage values required by the loads powered by the same set of isolated power supply circuits; the first input voltage information is the input power supply voltage value of the isolated power supply circuit; the hierarchical voltage information sequence is the output voltage value of each stage of the isolated power supply topology of the isolated power supply circuit; the first topology analog switch is the conduction switch of the isolated power supply topology, which is used to form the power supply voltage required by the power supply load.

[0174] In this embodiment, according to the voltage requirements of the power supply load, configure the input power supply voltage value of the isolated power supply circuit, and then combine the switching conditions of each stage of the isolated power supply topology module of the isolated power supply circuit to switch the conduction conditions of the isolated power supply topology module. First, collect the power supply voltage required by each power supply load to form a voltage value sequence, that is, the first voltage information sequence; among them, the above power supply loads are powered by the isolated power supply generated by the same set of isolated power supply circuits. Secondly, combine the circuit configuration of the isolated power supply circuit, and according to the set input voltage calculation method, obtain the input power supply voltage of the isolated power supply circuit. Among them, not only the isolated power supply generated by the input power supply voltage can meet the power supply requirements of all power supply loads, but also it is the lowest voltage value when meeting the power supply requirements. Then, according to the circuit configuration of the isolated power supply circuit, combine the input power supply voltage of the configured isolated power supply circuit to obtain the output voltage value of each stage of the isolated power supply topology, which is used to form the hierarchical voltage information sequence. Finally, according to the magnitude relationship between the power supply voltage value required by the power supply load and the output voltage value of each stage of the isolated power supply topology, switch the topology analog switches of each stage of the isolated power supply topology, that is, switch the conduction conditions of the isolated power supply topology, which is used to combine into the power supply voltage required by the power supply load and the isolated power supplies.

[0175] According to an embodiment of the present invention, the determining the first input voltage information according to the first voltage information sequence is specifically:

[0176] Determine the first boundary information and the second boundary information according to the first voltage information sequence;

[0177] Obtain the first voltage sum information according to the first boundary information according to a preset voltage sum calculation strategy;

[0178] Determine whether the first boundary information is greater than the second boundary information;

[0179] If so, set the first input voltage information according to the first voltage and information;

[0180] If not, calculate the average value of the first boundary information and the second boundary information to obtain the third boundary information;

[0181] According to the third boundary information, obtain the second voltage and information according to a preset voltage sum calculation strategy;

[0182] Determine whether the second voltage and information is greater than the first voltage and information;

[0183] If so, set the second boundary information according to the third boundary information;

[0184] If not, set the first boundary information according to the third boundary information, and update the first voltage and information according to the second voltage and information.

[0185] It should be noted that the first boundary information is the lower boundary of the minimum grading voltage selection range in the calculation process of the first input voltage information; the second boundary information is the upper boundary of the minimum grading voltage selection range in the calculation process of the first input voltage information; the first voltage and information is the minimum value of the sum of the required supply voltage values of the power supply load in the calculation process of the first input voltage information; the second voltage and information is the sum of the required supply voltage values of the power supply load calculated according to any minimum grading voltage in the calculation process of the first input voltage information; the minimum grading voltage is the minimum value of the grading voltage required to be provided by the same group of isolated power supply circuits according to the required power supply voltage value of the power supply load.

[0186] In this embodiment, through a preset voltage value search strategy, the minimum input power supply voltage value that meets the power supply requirements of the isolated power supply circuit is obtained. First, according to the required supply voltage value of the power supply load, determine the upper and lower boundaries of the minimum grading voltage. Then, use the voltage value corresponding to the lower boundary as the minimum grading voltage value, and according to a preset voltage sum calculation strategy, obtain the minimum value of the sum of the required supply voltage values of the power supply load, denoted as the first voltage and information. Finally, execute the following loop judgment process:

[0187] Determine whether the first boundary information is greater than the second boundary information. If the first boundary information is greater than the second boundary information, it indicates that the value range boundaries overlap, that is, the value range is missing. At this time, set the first input voltage information according to the first voltage and information, and end the above loop judgment process. If the first boundary information is not greater than the second boundary information, select the minimum grading voltage value from the value range included by the upper and lower boundaries; as an implementation manner, calculate the average value of the first boundary information and the second boundary information, that is, the third boundary information, as the minimum grading voltage value. Then, according to the voltage value corresponding to the third boundary information, obtain the calculated value of the sum of the supply voltage values, that is, the second voltage sum information, according to the preset voltage sum calculation strategy, and use it to compare the magnitude relationship between the second voltage sum information and the first voltage sum information. When the second voltage sum information is greater than the first voltage sum information, it means that the total supply voltage calculated according to the voltage value corresponding to the third boundary is larger than the previous calculated value. At this time, lower the second boundary information according to the third boundary information. When the second voltage sum information is not greater than the first voltage sum information, it means that the total supply voltage calculated according to the voltage value corresponding to the third boundary is smaller than the previous calculated value. At this time, first update the first voltage sum information according to the second voltage sum information to save the smaller value of the supply voltage, and then raise the second boundary information according to the third boundary information. Finally, execute the above loop judgment process again according to the magnitude relationship between the first boundary information and the second boundary information.

[0188] According to an embodiment of the present invention, the determination of the first boundary information and the second boundary information according to the first voltage information sequence is specifically as follows:

[0189] Determine the second voltage information according to the first voltage information sequence;

[0190] Set the second boundary information according to the second voltage information;

[0191] Obtain a preset grading threshold;

[0192] Calculate the downward rounded ratio of the second voltage information to the grading threshold to obtain the first ratio information;

[0193] Set the first boundary information according to the first ratio information.

[0194] It should be noted that the second voltage information is the maximum value in the first voltage information sequence; the grading threshold is the number of grades of the isolation power supply topology in the isolation power supply circuit. In this embodiment, according to the voltage requirements of the power supply load and the configuration of the isolation power supply circuit, the first boundary information and the second boundary information are set. First, the maximum voltage value is extracted from the first voltage information sequence, that is, the second voltage information, and then the upper boundary, that is, the second boundary information, is set according to the second voltage information. Then, the ratio of the second voltage information to the grading threshold is calculated, and the result of rounding down the ratio is used as the first ratio information; then the lower boundary, that is, the first boundary information, is set according to the first ratio information.

[0195] According to the embodiment of the present invention, the voltage sum calculation strategy is specifically as follows:

[0196] Obtain the first unit voltage information;

[0197] Select the first voltage information in the first voltage information sequence in sequence according to the preset order;

[0198] Calculate the ceiling ratio of the first voltage information to the first unit voltage information to obtain the second ratio information;

[0199] Obtain the third voltage information according to the product of the second ratio information and the first unit voltage information;

[0200] Accumulate the third voltage information in sequence to obtain the voltage sum information.

[0201] It should be noted that the first unit voltage information is the minimum grading voltage required by the isolation power supply circuit when calculating the voltage sum, and at least includes the voltage values corresponding to the first boundary information and the third boundary information; the third voltage information is the voltage value that the isolation power supply circuit can provide when the power supply load is the first voltage information; the voltage sum information is the total voltage that the isolation power supply circuit needs to provide when the first unit voltage information is used as the minimum grading voltage. In this embodiment, first, the first voltage information is selected in sequence according to the order of the first voltage information sequence, and the ratio to the unit voltage information is calculated. The result of rounding up the ratio is used as the second ratio information. Then, the product of the second ratio information and the first unit voltage information is calculated to obtain the third voltage information, which is used to represent the minimum power supply voltage value of the isolation power supply circuit to meet the power supply requirements of the power supply load according to the current minimum grading voltage. Finally, the sum of the third voltage information that each power supply load can obtain is calculated to obtain the voltage sum information.

[0202] According to the embodiment of the present invention, determining the grading voltage information sequence according to the first input voltage information is specifically as follows:

[0203] Obtain the first grading turn ratio information, the first intermediate grading turn ratio information, the second intermediate grading turn ratio information, and the second grading turn ratio information;

[0204] Determine the first grading voltage information according to the first input voltage information and the first grading turn ratio information;

[0205] Determine the first intermediate grading voltage information according to the first grading voltage information and the first intermediate grading turn ratio information;

[0206] Determine the second intermediate grading voltage information according to the first intermediate grading voltage information and the second intermediate grading turn ratio information;

[0207] Determine the second grading voltage information according to the second intermediate grading voltage information and the second grading turn ratio information;

[0208] Obtain a grading voltage information sequence according to the first grading voltage information, the first intermediate grading voltage information, the second intermediate grading voltage information, and the second grading voltage information.

[0209] It should be noted that the first grading turn ratio information is the number of grading levels of the first-stage grading circuit in the isolated power supply circuit; the second grading turn ratio information is the number of grading levels of the last-stage grading circuit in the isolated power supply circuit; the first intermediate grading turn ratio information and the second intermediate grading turn ratio information are the number of grading levels of the intermediate grading circuits located between the first-stage grading circuit and the last-stage grading circuit in the isolated power supply circuit, where the first intermediate grading circuit is at the front stage of the second intermediate grading circuit.

[0210] In this embodiment, a calculation process for the grading voltage is provided. In practical applications, to facilitate the control of the grading voltage range and combination, the turn ratio of each stage will be set to the same value, usually 2. For example, assuming that the input power supply voltage value of the isolated power supply circuit is 32 units, the isolated power supply circuit is provided with 5-level isolated power supply topologies, and the grading turn ratio of each topology is 2, the voltage of the first stage is 16 units, the voltage of the second stage is 8 units, the voltage of the third stage is 4 units, the voltage of the fourth stage is 2 units, and the voltage of the fifth stage is 1 unit. Therefore, the grading voltage information sequence is [16, 8, 4, 2, 1].

[0211] According to an embodiment of the present invention, the switching of the first topology analog switch according to the first voltage information sequence and the grading voltage information sequence is specifically as follows:

[0212] Sequentially extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information;

[0213] According to the fourth voltage information, compare it with the grading voltages in the grading voltage information sequence in a preset comparison order;

[0214] Determine whether the fourth voltage information is greater than the grading voltage;

[0215] If so, disconnect the conduction switch of the isolation power supply topology module corresponding to the grading voltage;

[0216] If not, calculate the difference between the fourth voltage information and the next grading voltage after the grading voltage for updating the fourth voltage information;

[0217] Determine whether the fourth voltage information exceeds 0;

[0218] If so, continue to execute the comparison step between the fourth voltage information and the grading voltage information sequence;

[0219] If not, extract the first voltage information from the first voltage information sequence to obtain the fourth voltage information until all the first voltage information in the first voltage information sequence is compared.

[0220] It should be noted that the fourth voltage information is the voltage operation value in the calculation process of the topology analog switch for the power supply load. In this embodiment, the conduction switch of the isolation power supply topology module is switched to configure the isolation power supply for the power supply load in sequence. As an implementation manner, the first voltage information is extracted from the first voltage information sequence according to the voltage value required by the power supply load in sequence to set the fourth voltage information. First, according to the grading voltage information sequence, the grading voltage is obtained in ascending order for comparison with the fourth voltage information. When the fourth voltage information is greater than the above grading voltage, the conduction switch of the isolation power supply topology module corresponding to the grading voltage is disconnected to indicate that the topology voltage division is not performed through the transformer. When the fourth voltage information is not greater than the above grading voltage, the conduction state of the conduction switch of the isolation power supply topology module corresponding to the grading voltage is maintained, and the difference between the fourth voltage information and the next grading voltage after the grading voltage is calculated to update the fourth voltage information; for example, the fourth voltage information is 5, the current grading voltage is 8, and the next grading voltage is 4. Since the fourth voltage information is less than the current grading voltage, at this time, calculate the difference between the fourth voltage information and the next grading voltage (5 - 4 = 1), and update the fourth voltage information to 1. Then, determine whether the fourth voltage information exceeds 0; if the fourth voltage information exceeds 0, it means that the isolation power supply for the power supply load needs to be continued, and the comparison step between the fourth voltage information and the grading voltage information sequence is continued; if the fourth voltage information does not exceed 0, it means that the isolation power supply configuration for the current power supply load is completed, and the isolation power supply for the next power supply load is configured.

[0221] It is worth mentioning that it further includes:

[0222] Obtain the second voltage information sequence;

[0223] Calculate the difference between the elements of the first voltage sequence and the second voltage information sequence in sequence order to obtain a first difference sequence;

[0224] Determine whether the first differences in the first difference sequence are all greater than a preset difference threshold;

[0225] If so, lower the duty cycle parameter of the PWM chip.

[0226] It should be noted that the second voltage information is the supply voltage value obtained by the power supply load; the obtaining of the second voltage information sequence is a voltage sequence composed of the second voltage information. In this embodiment, by the difference between the power supply value and the power demand value of the power supply load, the operating parameters of the PWM chip are adjusted to finely adjust the flyback voltage of the isolated power supply circuit, and the safety of the circuit operation is improved by lowering the voltage. When the difference between the power supply value and the power demand value of the power supply load is greater than the preset difference threshold, the operating parameters of the PWM can be lowered to achieve the effect of finely adjusting the flyback voltage of the isolated power supply circuit.

[0227] It is worth mentioning that it also includes:

[0228] Obtain first current information;

[0229] Determine whether the first current information exceeds a preset current threshold;

[0230] If so, disconnect the first topology analog switch of the first stage.

[0231] It should be noted that the first current information is the operating current of the flyback power supply module in the isolated power supply circuit. When the current is too high, there is a problem of burning out the transistors in the flyback power supply module. Therefore, in this embodiment, the safety of the isolated power supply circuit is also improved by monitoring the current.

[0232] It is worth mentioning that it also includes:

[0233] Obtain first current information;

[0234] Obtain first power information according to the first current information and the first input voltage information;

[0235] Determine whether the first power information exceeds a preset power threshold;

[0236] If so, lower the first input voltage information or lower the duty cycle parameter of the PWM chip.

[0237] It should be noted that the operating power of the isolated power supply circuit is calculated based on the operating current and the input power supply voltage in the flyback power supply module, that is, the first power information. In this embodiment, when the first power information exceeds the preset power threshold, the operating power of the isolated power supply circuit is controlled by reducing the input voltage or adjusting the operating parameters of the PWM chip, thereby improving the safety of the isolated power supply circuit.

[0238] The third aspect of the present invention provides a computer-readable storage medium, which includes a control method program for a flyback multi-stage isolated power supply. When the control method program for the flyback multi-stage isolated power supply is executed by a processor, the steps of the control method for the flyback multi-stage isolated power supply as described in any one of the above are implemented.

[0239] In summary, the present invention provides a control method, system and storage medium for a flyback multi-stage isolated power supply, which is applied to a flyback multi-stage isolated transistor drive power supply circuit. The circuit generates multiple groups of isolated power supplies through a group of flyback power supply modules and at least two groups of isolated power supply topology modules, greatly reducing the number of components used. The present invention can adjust the input power supply voltage of the flyback power supply module according to the total voltage required by the power supply load; and then control the conduction of the topology analog switch of the isolated power supply topology module according to the hierarchical turn ratio of the isolated power supply topology module, so as to combinatorially output multiple isolated power supplies that meet the power supply voltages required by the power supply load. The present invention realizes the output of multiple groups of isolated power supplies in an isolated circuit with fewer core components, improving the integration and portability of the isolated power supply.

[0240] If the above functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks or optical disks, etc., which can store program codes.

[0241] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a flyback multi-stage isolated power supply, applied to a flyback multi-stage isolated transistor drive power supply circuit, the circuit comprising: A group of flyback power modules and at least two groups of isolated power supply topology modules; The flyback power module uses a PWM chip as a flyback power supply, and then drives the power supply through at least one transistor, and is connected to the primary of the transformer; The isolated power supply topology module is an isolated drive power supply composed of the secondary of the transformer; Characterized in that the method comprises: Obtain a first voltage information sequence; According to the first voltage information sequence, determine first boundary information and second boundary information; According to the first boundary information, obtain first voltage sum information according to a preset voltage sum calculation strategy; Judge whether the first boundary information is greater than the second boundary information; If so, set first input voltage information according to the first voltage sum information; If not, calculate the average value of the first boundary information and the second boundary information to obtain third boundary information; According to the third boundary information, obtain second voltage sum information according to a preset voltage sum calculation strategy; Judge whether the second voltage sum information is greater than the first voltage sum information; If so, set the second boundary information according to the third boundary information; If not, set the first boundary information according to the third boundary information, and update the first voltage sum information according to the second voltage sum information; Configure the power supply voltage of the flyback power module according to the first input voltage information; According to the first input voltage information, determine a hierarchical voltage information sequence; According to the first voltage information sequence and the hierarchical voltage information sequence, switch the first topology analog switch.

2. The control method of the flyback multi-stage isolated power supply according to claim 1, characterized in that The determining the first boundary information and the second boundary information according to the first voltage information sequence is specifically: According to the first voltage information sequence, determine second voltage information; Set the second boundary information according to the second voltage information; Obtain a preset hierarchical threshold; Calculate the floor ratio of the second voltage information to the hierarchical threshold to obtain first ratio information; Set the first boundary information according to the first ratio information.

3. The control method of the flyback multi-stage isolated power supply according to claim 1, characterized in that, The voltage sum calculation strategy is specifically: Obtain first unit voltage information; In a preset order, sequentially select first voltage information in the first voltage information sequence; Calculate the ceiling ratio of the first voltage information to the first unit voltage information to obtain second ratio information; Obtain third voltage information according to the product of the second ratio information and the first unit voltage information; Accumulate the third voltage information in sequence to obtain voltage sum information.

4. The control method of the flyback multi-stage isolated power supply according to claim 1, wherein The determining the hierarchical voltage information sequence according to the first input voltage information is specifically: Obtain first hierarchical turn ratio information, first intermediate hierarchical turn ratio information, second intermediate hierarchical turn ratio information, and second hierarchical turn ratio information; According to the first input voltage information and the first hierarchical turn ratio information, determine first hierarchical voltage information; According to the first hierarchical voltage information and the first intermediate hierarchical turn ratio information, determine first intermediate hierarchical voltage information; Determine the second intermediate grading voltage information according to the first intermediate grading voltage information and the second intermediate grading turn ratio information; Determine the second grading voltage information according to the second intermediate grading voltage information and the second grading turn ratio information; Obtain a grading voltage information sequence according to the first grading voltage information, the first intermediate grading voltage information, the second intermediate grading voltage information, and the second grading voltage information.

5. The control method of the flyback multi-stage isolated power supply according to claim 1, characterized in that The switching of the first topology analog switch according to the first voltage information sequence and the grading voltage information sequence is specifically as follows: Successively extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information; According to the fourth voltage information, compare it with the grading voltages in the grading voltage information sequence in a preset comparison order; Judge whether the fourth voltage information is greater than the grading voltage; If so, turn off the conduction switch of the isolated power supply topology module corresponding to the grading voltage; If not, calculate the difference between the fourth voltage information and the next-level grading voltage of the grading voltage to update the fourth voltage information; Judge whether the fourth voltage information exceeds 0; If so, continue to execute the comparison step of the fourth voltage information with the grading voltage information sequence; If not, extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information until all the first voltage information in the first voltage information sequence has been compared.

6. A control system for a flyback multi-stage isolated power supply is applied to a flyback multi-stage isolated transistor drive power supply circuit, and the circuit includes: A group of flyback power supply modules and at least two groups of isolated power supply topology modules; The flyback power supply module uses a PWM chip as a flyback power supply, and then drives the power supply through at least one transistor and is connected to the primary of the transformer; The isolated power supply topology module is an isolated drive power supply composed of the secondary of the transformer; It is characterized in that the system includes a memory and a processor, and the memory includes a control method program for a flyback multi-stage isolated power supply. When the control method program for the flyback multi-stage isolated power supply is executed by the processor, the following steps are implemented: Obtain a first voltage information sequence; Determine the first boundary information and the second boundary information according to the first voltage information sequence; Obtain the first voltage sum information according to the first boundary information according to a preset voltage and calculation strategy; Judge whether the first boundary information is greater than the second boundary information; If so, set the first input voltage information according to the first voltage sum information; If not, calculate the average value of the first boundary information and the second boundary information to obtain the third boundary information; Obtain the second voltage sum information according to the third boundary information according to a preset voltage and calculation strategy; Judge whether the second voltage sum information is greater than the first voltage sum information; If so, set the second boundary information according to the third boundary information; If not, set the first boundary information according to the third boundary information, and update the first voltage sum information according to the second voltage sum information; Configure the power supply voltage of the flyback power supply module according to the first input voltage information; Determine the hierarchical voltage information sequence according to the first input voltage information; Switch the first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence.

7. The control system of the flyback multi-stage isolated power supply according to claim 6, characterized in that The step of switching the first topology analog switch according to the first voltage information sequence and the hierarchical voltage information sequence is specifically: Successively extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information; According to the fourth voltage information, compare it with the hierarchical voltages in the hierarchical voltage information sequence in the preset comparison order; Judge whether the fourth voltage information is greater than the hierarchical voltage; If so, turn off the conduction switch of the isolated power supply topology module corresponding to the hierarchical voltage; If not, calculate the difference between the fourth voltage information and the next-level hierarchical voltage of the hierarchical voltage to update the fourth voltage information; Judge whether the fourth voltage information exceeds 0; If so, continue to execute the comparison step of the fourth voltage information and the hierarchical voltage information sequence; If not, extract the first voltage information in the first voltage information sequence to obtain the fourth voltage information until all the first voltage information in the first voltage information sequence is compared.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer-readable storage medium includes a control method program for a flyback multi-stage isolated power supply. When the control method program for the flyback multi-stage isolated power supply is executed by a processor, the steps of the control method for the flyback multi-stage isolated power supply according to any one of claims 1 to 5 are implemented.

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