A control circuit and method for multiple backup power supplies based on a multi-flyback structure

Abstract

This invention provides a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit achieves joint power supply from the main power supply and backup power supply through two flyback auxiliary power supply modules and an output aggregation module, meeting high power demand and redundant power supply requirements. An input decoupling module completely decouples the input-side power supply, avoiding reduced insulation detection accuracy. The control method adjusts the main power supply voltage in real time based on the difference between the main power supply voltage and a first target voltage. When the main power supply voltage meets the load demand, it is configured as a main-backup mode, with the main power supply providing power alone. When the main power supply voltage does not meet the load demand, it is configured as a combined power supply mode, with the main power supply and backup power supply providing power together. This achieves highly reliable redundant power supply, significantly improving the safety of the power supply system. Furthermore, dynamic adjustment of the main and backup power supply states achieves balanced power distribution, improving power supply flexibility.

Description

Technical Field

[0001] This invention belongs to the field of flyback power supplies. More specifically, this invention discloses a control circuit and method for a multi-backup power supply based on a multi-flyback structure. Background Technology

[0002] With the rapid development of the new energy industry, the widespread application of technologies such as photovoltaic power generation and lithium battery energy storage has placed higher demands on the auxiliary power supplies of power electronic equipment. High-power equipment (such as inverters and battery management systems) needs to provide stable and highly reliable auxiliary power to loads such as cooling fans and control circuits. Meanwhile, in scenarios such as photovoltaic systems and electric vehicles, the insulation detection accuracy of the input power supply directly affects the safety of the equipment.

[0003] However, existing auxiliary power supplies are mostly based on single flyback topologies, which are difficult to meet high power demands and redundant power supply requirements. Once the power module fails or the input power is interrupted, the load power supply will be completely interrupted, failing to meet the continuous operation requirements of high-reliability scenarios. Furthermore, the single flyback topology is limited by power density and efficiency bottlenecks; forcibly increasing the power can easily lead to device overheating or a sharp drop in efficiency, making it difficult to support loads such as high-power cooling fans. In addition, when the auxiliary power supply draws power from multiple input ports (such as the photovoltaic DC side and the battery pack DC side), the electrical connections on the input side create leakage current paths, interfering with the insulation detection circuit, increasing detection errors, and significantly reducing insulation detection accuracy, leading to safety hazards.

[0004] Therefore, there is an urgent need for a new power supply topology that can both improve power supply reliability and solve input coupling interference. Summary of the Invention

[0005] In view of the above problems, the purpose of this invention is to provide a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit realizes joint power supply of the main power supply and backup power supply through two flyback auxiliary power supply modules and an output aggregation module, meeting high power demand and redundant power supply requirements. An input decoupling module achieves complete decoupling of the input-side power supply, avoiding a reduction in insulation detection accuracy. The control method adjusts the main power supply voltage in real time according to the difference between the main power supply voltage and a first target voltage. When the main power supply voltage meets the load demand, it is configured as a main-backup mode, with the main power supply providing power alone. When the main power supply voltage does not meet the load demand, it is configured as a combined power supply mode, with the main power supply and backup power supply providing power together. This achieves highly reliable redundant power supply and significantly improves the safety of the power supply system. Furthermore, by dynamically adjusting the power supply status of the main and backup power supplies, power balance distribution is achieved, improving the flexibility of power supply.

[0006] To achieve the above objectives, a first aspect of the present invention provides a control circuit for multiple backup power supplies based on a multi-flyback structure, the control circuit comprising:

[0007] At least two flyback auxiliary power supply modules, one input decoupling module and one output aggregation module;

[0008] The flyback auxiliary power module is used to generate flyback voltage, and the flyback auxiliary power module includes a first input terminal and a first output terminal.

[0009] The input decoupling module is used to decouple multiple power supplies and includes at least two second input terminals and at least two second output terminals;

[0010] The output aggregation module is used to combine the output voltages of multiple flyback auxiliary power supply modules in series, including at least two third input terminals and one third output terminal;

[0011] The first input terminal of the flyback auxiliary power module is connected to a second output terminal of the input decoupling module;

[0012] The first output terminal of the flyback auxiliary power module is connected to a third input terminal of the output aggregation module;

[0013] The second input terminal of the input decoupling module is connected to the power supply.

[0014] The third output terminal of the output aggregation module is connected to the electrical load.

[0015] In this solution, the flyback auxiliary power supply module specifically includes:

[0016] Flyback structure module, PWM generator module, transformer module;

[0017] The PWM generation module is used to generate control signals, which are used to connect to the on control terminal of the flyback structure module;

[0018] The flyback structure module generates a flyback signal based on the control signal from the conduction control terminal and the input power supply.

[0019] The transformer module outputs a flyback voltage based on the flyback signal.

[0020] In this solution, the PWM generation module specifically includes:

[0021] PWM chip and optocoupler module;

[0022] The PWM chip is used to generate PWM signals;

[0023] The optocoupler module is used to isolate and output the PWM signal to generate the control signal.

[0024] In this solution, the input decoupling module specifically refers to:

[0025] At least two power supplies connected to the second input terminal are completely decoupled to obtain independent decoupling voltages;

[0026] Each second output terminal outputs a decoupling voltage.

[0027] A second aspect of the present invention also provides a control method for multiple backup power supplies based on a multi-flyback structure, applied in any of the control circuits for multiple backup power supplies based on a multi-flyback structure described above, wherein the control method specifically includes:

[0028] Based on the load voltage information, the first target voltage information is obtained;

[0029] Obtain the first flyback voltage information;

[0030] The difference between the first flyback voltage and the first target voltage information is calculated to obtain the first deviation information;

[0031] Based on the preset control quantity adjustment algorithm, the first duty cycle adjustment amount is obtained according to the first deviation information, which is used to update the first PWM signal;

[0032] Within a preset first time period, it is determined whether the first deviation information is lower than a preset deviation threshold.

[0033] If so, configure the power supply mode as primary / standby mode;

[0034] If not, configure the power supply mode to combined power supply mode;

[0035] Configure the output aggregation module and update the first target voltage information according to the power supply mode;

[0036] Based on the load voltage information and the first target voltage information, the second target voltage information is obtained;

[0037] Based on a preset control quantity adjustment algorithm, a second PWM signal is obtained according to the second target voltage information.

[0038] In this solution, configuring the output aggregation module and updating the first target voltage information according to the power supply mode specifically involves:

[0039] When determining the power supply mode as primary / standby mode;

[0040] Configure the output aggregation module to single-channel output mode;

[0041] The first target voltage information remains the same as the load voltage information;

[0042] The second target information is set to 0.

[0043] In this solution, configuring the output aggregation module and updating the first target voltage information according to the power supply mode specifically involves:

[0044] When the power supply mode is determined to be a combined power supply mode;

[0045] Configure the output aggregation module to a serial output mode;

[0046] The first PWM signal is set to a preset duty cycle reference value, and then the first flyback voltage information is measured.

[0047] Based on the first flyback voltage information, the first target voltage information is set;

[0048] The difference between the load voltage information and the first target voltage information is calculated to obtain the second target voltage information.

[0049] In this scheme, the second PWM signal is obtained based on the second target voltage information according to the preset control quantity adjustment algorithm, specifically as follows:

[0050] Obtain the second flyback voltage information;

[0051] The difference between the second flyback voltage and the second target voltage information is calculated to obtain the second deviation information;

[0052] Based on the preset control quantity adjustment algorithm, the second duty cycle adjustment quantity is obtained according to the second deviation information, which is used to update the second PWM signal.

[0053] In this scheme, the preset control quantity adjustment algorithm is specifically as follows:

[0054] Obtain voltage deviation information;

[0055] Based on the voltage deviation information and the preset proportional coefficient, the proportional control quantity is obtained;

[0056] The integral control quantity is obtained based on the integral value of the voltage deviation information and the preset integral coefficient;

[0057] Based on the differential value of the voltage deviation information and the preset differential coefficient, the differential control quantity is obtained;

[0058] The duty cycle adjustment is obtained by calculating the sum of the proportional control quantity, the integral control quantity, and the derivative control quantity.

[0059] This plan also includes:

[0060] Obtain the first current information;

[0061] Determine whether the first current information exceeds a preset current threshold;

[0062] If so, configure the power supply mode to combined power supply mode;

[0063] Based on the first current information, the first target voltage information is lowered;

[0064] Based on the first target voltage information, the second target voltage information is obtained.

[0065] This invention provides a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit achieves joint power supply from the main power supply and backup power supply through two flyback auxiliary power supply modules and an output aggregation module, meeting high power demand and redundant power supply requirements. An input decoupling module completely decouples the input-side power supply, avoiding reduced insulation detection accuracy. The control method adjusts the main power supply voltage in real time based on the difference between the main power supply voltage and a first target voltage. When the main power supply voltage meets the load demand, it is configured as a main-backup mode, with the main power supply providing power alone. When the main power supply voltage does not meet the load demand, it is configured as a combined power supply mode, with the main power supply and backup power supply providing power together. This achieves highly reliable redundant power supply, significantly improving the safety of the power supply system. Furthermore, dynamic adjustment of the main and backup power supply states achieves balanced power distribution, improving power supply flexibility. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0067] Figure 1 A schematic diagram of the connection structure of a control circuit for multiple backup power supplies based on a multi-flyback structure is shown.

[0068] Figure 2 A schematic diagram of the connection structure of the flyback auxiliary power supply module provided in an embodiment of the present invention is shown;

[0069] Figure 3 A flowchart of a control method for multiple backup power supplies based on a multi-flyback structure is shown;

[0070] Figure 4 The flowchart of the operation of the primary / standby mode provided in the embodiment of the present invention is shown;

[0071] Figure 5 The flowchart of the combined power supply mode provided in the embodiment of the present invention is shown. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Unless otherwise defined, all terms (including technical and scientific terms) used in embodiments of this invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in a common dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as being interpreted in an idealized or highly formalized sense, unless expressly defined in this embodiment of the invention.

[0074] The terms "first," "second," and similar words used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Similarly, terms such as "including" or "comprising" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The steps preceding or following the steps in the method of the embodiments of this invention are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0075] Please refer to Figure 1 , Figure 1 A schematic diagram of the connection structure of a control circuit based on a multi-flyback structure and multiple backup power supplies is shown.

[0076] like Figure 1 As shown, the first aspect of the present invention discloses a control circuit for multiple backup power supplies based on a multi-flyback structure, the circuit comprising:

[0077] At least two flyback auxiliary power supply modules 1021 / 1022, one input decoupling module 101 and one output summarizing module 103;

[0078] The flyback auxiliary power module is used to generate flyback voltage, and the flyback auxiliary power module includes a first input terminal and a first output terminal.

[0079] The input decoupling module is used to decouple multiple power supplies and includes at least two second input terminals and at least two second output terminals;

[0080] The output aggregation module is used to combine the output voltages of multiple flyback auxiliary power supply modules in series, including at least two third input terminals and one third output terminal;

[0081] The first input terminal of the flyback auxiliary power module is connected to a second output terminal of the input decoupling module;

[0082] The first output terminal of the flyback auxiliary power module is connected to a third input terminal of the output aggregation module;

[0083] The second input terminal of the input decoupling module is connected to the power supply.

[0084] The third output terminal of the output aggregation module is connected to the electrical load.

[0085] It should be noted that the first input terminal is the power input terminal of the flyback auxiliary power module, used to receive power supply from the input decoupling module; the first output terminal is the power output terminal of the flyback auxiliary power module, used to output flyback voltage; the second input terminal is the power supply connection port of the input decoupling module; the second output terminal is the decoupling power output port of the input decoupling module; the third input terminal is the flyback power connection port of the output summing module; and the third input terminal is the load power output port of the output summing module.

[0086] In this embodiment, at least two power supplies, V1 / V2, provide power to the control circuit, connected to the control circuit through the input decoupling module. The input decoupling module completely decouples the power supplies, disconnecting the electrical connection between the two power supplies to achieve electrical insulation and avoid reducing the accuracy of insulation detection. The input decoupling module connects the decoupled power supplies to different flyback auxiliary power supply modules, thereby generating at least two flyback voltages. The output aggregation module receives at least two flyback voltages and switches the output channel according to the configured power supply mode to provide power to the load. By using at least two power supplies in combination, highly reliable redundant power supply is achieved, significantly improving the safety of the power supply system.

[0087] Please refer to Figure 2 , Figure 2 A schematic diagram of the connection structure of the flyback auxiliary power supply module provided in an embodiment of the present invention is shown.

[0088] According to embodiments of the present invention, such as Figure 2 As shown, the flyback auxiliary power supply module specifically includes:

[0089] Flyback structure module 202, PWM generator module 201, transformer module 203;

[0090] The PWM generation module is used to generate control signals, which are used to connect to the on control terminal of the flyback structure module;

[0091] The flyback structure module generates a flyback signal based on the control signal from the conduction control terminal and the input power supply.

[0092] The transformer module outputs a flyback voltage based on the flyback signal.

[0093] It should be noted that the flyback auxiliary power supply module generates a PWM signal through a PWM generator module, which can adjust the frequency and duty cycle of the PWM signal. The transistors in the flyback structure module generate a flyback signal based on the PWM signal. This signal, combined with the power supply from the flyback auxiliary power supply module, acts on the primary winding of the transformer module to generate a flyback voltage. The flyback voltages output by the transformer module are mutually isolated, further improving the insulation between power supply voltages.

[0094] According to an embodiment of the present invention, the PWM generating module specifically includes:

[0095] PWM chip and optocoupler module;

[0096] The PWM chip is used to generate PWM signals;

[0097] The optocoupler module is used to isolate and output the PWM signal to generate the control signal.

[0098] It should be noted that the PWM chip outputs a PWM signal with a set frequency and duty cycle based on control signals or communication data. The optocoupler module isolates the PWM signal generated by the PWM chip and transmits the output signal to the flyback module, thereby achieving isolated transmission of the PWM signal.

[0099] According to an embodiment of the present invention, the input decoupling module specifically comprises:

[0100] At least two power supplies connected to the second input terminal are completely decoupled to obtain independent decoupling voltages;

[0101] Each second output terminal outputs a decoupling voltage.

[0102] It should be noted that the input decoupling module includes at least two input terminals and at least two output terminals. Each input terminal is connected to a power supply. The input decoupling module completely decouples the input power supply before transmitting it to the corresponding output terminal, thus avoiding the problem of reduced insulation detection accuracy caused by the electrical coupling characteristics between the input power supplies.

[0103] Please refer to Figure 3 , Figure 3 A flowchart of a control method for multiple backup power supplies based on a multi-flyback structure is shown.

[0104] like Figure 3 As shown, the second aspect of the present invention discloses a control method for multiple backup power supplies based on a multi-flyback structure, the method specifically including:

[0105] S302, based on the load voltage information, obtain the first target voltage information;

[0106] S304, obtain the first flyback voltage information;

[0107] S306, calculate the difference between the first flyback voltage and the first target voltage information to obtain the first deviation information;

[0108] S308, based on a preset control quantity adjustment algorithm, obtains a first duty cycle adjustment amount according to the first deviation information, which is used to update the first PWM signal;

[0109] S310, within a preset first time period, determine whether the first deviation information is lower than a preset deviation threshold.

[0110] S312, if so, then configure the power supply mode as primary / standby mode;

[0111] S314, if not, configure the power supply mode to combined power supply mode;

[0112] S316, Configure the output aggregation module and update the first target voltage information according to the power supply mode;

[0113] S318, Based on the load voltage information and the first target voltage information, the second target voltage information is obtained;

[0114] S320, based on a preset control quantity adjustment algorithm, obtains a second PWM signal according to the second target voltage information.

[0115] It should be noted that the load voltage information refers to the power supply voltage required by the load. The first flyback voltage information is the flyback voltage generated by the first flyback auxiliary power module, i.e., the main power supply output voltage; hereinafter, "main power supply" refers to the first flyback auxiliary power supply. The first target voltage information is the target value of the flyback voltage generated by the first flyback auxiliary power module, i.e., the target voltage value of the main power supply. The first PWM signal is the duty cycle of the PWM control signal of the first flyback auxiliary power module. The second flyback voltage information is the flyback voltage generated by the second flyback auxiliary power module, i.e., the backup power supply output voltage; hereinafter, "backup power supply" refers to the second flyback auxiliary power supply. The second target voltage information is the target value of the flyback voltage generated by the second flyback auxiliary power module, i.e., the target voltage value of the backup power supply. The second PWM signal is the duty cycle of the PWM control signal of the second flyback auxiliary power module. The main / backup mode is a working mode where the main power supply outputs only, and the backup power supply is in standby mode; the combined power supply mode is a working mode where the main power supply and the backup power supply output in a proportional manner.

[0116] In this embodiment, the PWM duty cycle of the main power supply is adjusted to ensure that the main power supply voltage meets the load voltage requirements. If the main power supply voltage meets the load voltage requirements, the power supply mode is configured as a primary / standby mode, with the main power supply providing power independently. If the main power supply voltage cannot meet the load voltage requirements, the power supply mode is configured as a combined power supply mode, with the main power supply and the standby power supply providing power jointly according to the power demand. The specific implementation process is as follows:

[0117] First, the target voltage of the main power supply is set according to the required supply voltage value of the load. Then, based on a preset control adjustment algorithm, the first duty cycle adjustment is calculated based on the difference between the output voltage of the main power supply and the target voltage, which is used to update the PWM signal of the main power supply. Second, within a preset first time period, it is determined whether the output voltage of the main power supply can meet the power supply requirements of the load. If it does, it is set to main / standby mode, and the output aggregation module is configured to be powered solely by the main power supply. If it does not meet the requirements, it is set to combined power supply mode, and the output aggregation module is configured to be powered jointly by the main power supply and the standby power supply. Then, based on the power supply situation, the target supply voltage of the main power supply is updated. Then, the difference between the load voltage and the target voltage of the main power supply is calculated to obtain the target voltage of the standby power supply. Finally, based on the preset control adjustment algorithm, the PWM signal of the standby power supply is obtained according to the target voltage of the standby power supply.

[0118] Please refer to Figure 4 , Figure 4 The flowchart of the operation of the primary / standby mode provided in the embodiment of the present invention is shown.

[0119] In embodiments of the present invention, such as Figure 4As shown, configuring the output aggregation module and updating the first target voltage information according to the power supply mode specifically involves:

[0120] S402, when determining the power supply mode as primary / standby mode;

[0121] S404, Configure the output aggregation module to single-channel output mode;

[0122] S406, the first target voltage information remains the same as the load voltage information;

[0123] S408, the second target information is set to 0.

[0124] It should be noted that, in this embodiment, the specific operation flow of the primary / standby mode is as follows: when switching to primary / standby mode, the output aggregation module is configured as a single-channel output mode; the first target voltage information remains the same as the load voltage information. As one implementation method, when switching to primary / standby mode, by configuring the output aggregation module, the load is supplied with voltage by the main power supply output voltage, i.e., configured as a single-channel output mode. Furthermore, setting the target voltage of the main power supply to be the same as the load voltage indicates that the main power supply provides power to the load; setting the target voltage of the standby power supply to 0 indicates that the standby power supply does not need to provide power.

[0125] Please refer to Figure 5 , Figure 5 The flowchart of the combined power supply mode provided in the embodiment of the present invention is shown.

[0126] In embodiments of the present invention, such as Figure 5 As shown, configuring the output aggregation module and updating the first target voltage information according to the power supply mode specifically involves:

[0127] S502, when it is determined that the power supply mode is a combined power supply mode;

[0128] S504, Configure the output aggregation module to be in serial output mode;

[0129] S506, set the first PWM signal to a preset duty cycle reference value, and then measure the first flyback voltage information;

[0130] S508, Set the first target voltage information according to the first flyback voltage information;

[0131] S510, calculate the difference between the load voltage information and the first target voltage information to obtain the second target voltage information.

[0132] It should be noted that, in this embodiment, the specific operation flow of the combined power supply mode is as follows: when switching to combined power supply mode, the output aggregation module is configured as a series output mode; the first PWM signal is set to a preset duty cycle reference value, and then the first flyback voltage information is measured; based on the first flyback voltage information, the first target voltage information is set; based on the first target voltage information, the second target voltage information is obtained. As one implementation method, when switching to combined power supply mode, by configuring the output aggregation module, the load is supplied with voltage by the output voltages of the main power supply and the backup power supply connected in series, i.e., configured as a series output mode. Then, the PWM signal of the main power supply is set to a preset duty cycle, and the output voltage value of the main power supply at this time is set as the target voltage of the main power supply. Finally, the difference between the load voltage and the target voltage of the main power supply is the voltage value that the backup power supply needs to provide. The output aggregation module achieves voltage isolation and superposition through diodes or active switching circuits to ensure no conflict between the main and backup power supply outputs.

[0133] In this embodiment of the invention, the step of obtaining the second PWM signal based on the second target information using a preset control quantity adjustment algorithm specifically involves:

[0134] Obtain the second flyback voltage information;

[0135] The difference between the second flyback voltage and the second target voltage information is calculated to obtain the second deviation information;

[0136] Based on the preset control quantity adjustment algorithm, the second duty cycle adjustment quantity is obtained according to the second deviation information, which is used to update the second PWM signal.

[0137] It should be noted that this embodiment provides an output adjustment process for the backup power supply, specifically: the output voltage of the backup power supply is measured and obtained; a second voltage deviation value is obtained based on the difference between the output voltage of the backup power supply and the target voltage; based on a preset control quantity adjustment algorithm, a second duty cycle adjustment quantity is calculated based on the second voltage deviation value, which is used to update the duty cycle of the PWM signal of the backup power supply, thereby realizing voltage regulation of the backup power supply.

[0138] In this embodiment of the invention, the preset control quantity adjustment algorithm specifically includes:

[0139] Obtain voltage deviation information;

[0140] Based on the voltage deviation information and the preset proportional coefficient, the proportional control quantity is obtained;

[0141] The integral control quantity is obtained based on the integral value of the voltage deviation information and the preset integral coefficient;

[0142] Based on the differential value of the voltage deviation information and the preset differential coefficient, the differential control quantity is obtained;

[0143] The duty cycle adjustment is obtained by calculating the sum of the proportional control quantity, the integral control quantity, and the derivative control quantity.

[0144] It should be noted that in this embodiment, a feedback regulation algorithm is used to regulate the voltage of the main power supply or backup power supply. The voltage deviation information refers to the deviation between the output voltage of the main power supply or backup power supply and the target voltage. As one implementation method, a proportional control quantity is calculated based on the voltage deviation value and a preset proportional coefficient; an integral control quantity is calculated based on the integral value of the voltage deviation value and a preset integral coefficient; a differential control quantity is calculated based on the derivative value of the voltage deviation value and a preset derivative; finally, the sum of the proportional control quantity, integral control quantity, and differential control quantity is calculated to obtain the duty cycle adjustment quantity. The proportional coefficient controls the speed of output voltage regulation, while the integral and differential coefficients control the stability of output voltage regulation; that is, by adjusting the proportional coefficient, integral coefficient, or differential coefficient, the efficiency and stability of output voltage regulation are controlled.

[0145] In this embodiment of the invention, it further includes:

[0146] Obtain the first current information;

[0147] Determine whether the first current information exceeds a preset current threshold;

[0148] If so, configure the power supply mode to combined power supply mode;

[0149] Based on the first current information, the first target voltage information is lowered;

[0150] Based on the first target voltage information, the second target voltage information is obtained.

[0151] It should be noted that the first current information refers to the operating current of the flyback auxiliary power supply module of the main power supply. When the first current information exceeds a preset current threshold, it indicates that the current of the main power supply is too high, posing a risk of malfunction or damage. In this case, the power supply mode is configured to combined power supply mode, using the backup power supply for auxiliary power. First, based on the first current information, a voltage reduction value is determined to lower the target voltage of the main power supply; then, based on the difference between the load voltage and the target voltage within the main power supply, the target voltage of the backup power supply is obtained. By driving the flyback auxiliary power supply module of the backup power supply, auxiliary power is provided to reduce the power supply load of the main power supply, preventing damage to the main power supply due to excessive current, thereby improving the operational reliability and safety of the power circuit.

[0152] It is worth mentioning that it also includes:

[0153] Obtain the first temperature information;

[0154] Determine whether the first temperature information exceeds a preset temperature threshold;

[0155] If so, then the first PWM signal is reduced, and the first flyback voltage information is measured again;

[0156] Based on the first flyback voltage information, the first target voltage information is set and the second target voltage information is updated.

[0157] It should be noted that the first temperature information refers to the operating temperature of the main power supply circuit. When the first temperature exceeds a preset temperature threshold, it indicates that the main power supply temperature is too high, posing a risk of malfunction or damage. In this case, the duty cycle of the main power supply's PWM signal is reduced, which means reducing the main power supply load. Based on the adjusted main power supply output voltage, the first target voltage information is set. Finally, the target voltage of the backup power supply is obtained based on the difference between the load voltage and the target voltage within the main power supply. By driving the flyback auxiliary power supply module of the backup power supply, auxiliary power is provided to reduce the main power supply load, prevent the main power supply from being damaged due to overheating, and thus improve the operational reliability and safety of the power supply circuit.

[0158] It is worth mentioning that it also includes:

[0159] In a photovoltaic power supply system, the main power is provided by a photovoltaic array, and the backup power is provided by a lithium battery pack.

[0160] When determining the power supply mode as primary / standby mode;

[0161] When the photovoltaic power generation is lower than the preset first power generation threshold;

[0162] If, after adjusting the first PWM signal, the first flyback voltage information is lower than the load voltage information;

[0163] Then the power supply mode will be configured as a combined power supply mode.

[0164] It should be noted that in a photovoltaic (PV) power supply system, the voltage generated by the PV array is typically used as the main power source, while the voltage output from the lithium battery pack serves as the backup power source. The loads in the PV system include inverters and heat sinks. In main / backup mode, if the PV array's power output falls below a preset first power threshold due to reduced sunlight intensity, it indicates that the main power supply may be insufficient to meet load demands. If adjusting the main power supply's PWM signal does not resolve the issue, and the main power supply output voltage remains below the load requirement, the power supply mode is configured as a combined cycle power supply, with the main power supply handling the inverter load and the backup power supply handling the heat sink load.

[0165] It is worth mentioning that it also includes:

[0166] In a photovoltaic power supply system, the main power is provided by a photovoltaic array, and the backup power is provided by a lithium battery pack.

[0167] When determining the power supply mode as primary / standby mode;

[0168] When the photovoltaic power generation is lower than the preset second power generation threshold;

[0169] Confirm the load voltage information based on the power supply requirements of the cooling system;

[0170] Based on the load voltage information, determine the second target voltage information.

[0171] It should be noted that in a photovoltaic (PV) power supply system, the voltage generated by the PV array typically serves as the main power source, while the voltage output from the lithium battery pack serves as the backup power source. The loads in the PV system include inverters and heat sinks. When environmental factors cause the PV array to fail to generate power or its power output to fall below a preset second power threshold, the main power supply capacity becomes insufficient. In this case, the inverter's load demand may decrease, requiring the backup power source to take over part of the load. However, to ensure the continuous operation of the heat sink system, the load voltage information is determined based on the heat sink's load to set the target voltage value for the backup power source. In other words, when the PV array is not generating power, the backup power source provides power to the heat sink to ensure the operational safety of the PV system.

[0172] In summary, this invention provides a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit achieves joint power supply from the main power supply and backup power supply through two flyback auxiliary power supply modules and an output aggregation module, meeting high power requirements and redundant power supply requirements. An input decoupling module completely decouples the input-side power supply, avoiding reduced insulation detection accuracy. The control method adjusts the main power supply voltage in real time based on the difference between the main power supply voltage and a first target voltage. When the main power supply voltage meets the load requirements, it is configured as a main-backup mode, with the main power supply providing power alone. When the main power supply voltage does not meet the load requirements, it is configured as a combined power supply mode, with the main power supply and backup power supply providing power together. This achieves highly reliable redundant power supply, significantly improving the safety of the power supply system. Furthermore, by dynamically adjusting the power supply status of the main and backup power supplies, power distribution is balanced, improving the flexibility of power supply.

[0173] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0174] If the aforementioned functions are implemented as software functional 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 this invention, or the part that contributes to the prior art, or a portion 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 invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0175] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for multiple backup power supplies based on a multi-flyback structure, applied in a control circuit for multiple backup power supplies based on a multi-flyback structure, wherein the control circuit includes at least two flyback auxiliary power supply modules, one input decoupling module and one output summarizing module; The flyback auxiliary power module is used to generate flyback voltage, and the flyback auxiliary power module includes a first input terminal and a first output terminal. The input decoupling module is used to decouple multiple power supplies and includes at least two second input terminals and at least two second output terminals; The output aggregation module is used to combine the output voltages of multiple flyback auxiliary power supply modules in series, including at least two third input terminals and one third output terminal; The first input terminal of the flyback auxiliary power module is connected to a second output terminal of the input decoupling module; The first output terminal of the flyback auxiliary power module is connected to a third input terminal of the output aggregation module; The second input terminal of the input decoupling module is connected to the power supply. The third output terminal of the output aggregation module is connected to the electrical load. Its features are, The control method for multiple backup power supplies based on a multi-flyback structure specifically includes: Based on the load voltage information, the first target voltage information is obtained; Obtain the first flyback voltage information; The difference between the first flyback voltage and the first target voltage information is calculated to obtain the first deviation information; Based on the preset control quantity adjustment algorithm, the first duty cycle adjustment amount is obtained according to the first deviation information, which is used to update the first PWM signal; Within a preset first time period, it is determined whether the first deviation information is lower than a preset deviation threshold. If so, configure the power supply mode as primary / standby mode; If not, configure the power supply mode to combined power supply mode; Configure the output aggregation module and update the first target voltage information according to the power supply mode; Based on the load voltage information and the first target voltage information, the second target voltage information is obtained; Based on the preset control quantity adjustment algorithm, the second PWM signal is obtained according to the second target voltage information; In a photovoltaic power supply system, the main power is provided by a photovoltaic array, and the backup power is provided by a lithium battery pack. When determining the power supply mode as primary / standby mode; When the photovoltaic power generation is lower than the preset first power generation threshold; If, after adjusting the first PWM signal, the first flyback voltage information is lower than the load voltage information; Then configure the power supply mode to combined heat and power (CHP) mode; When the photovoltaic power generation is lower than the preset second power generation threshold; Confirm the load voltage information based on the power supply requirements of the cooling system; Based on the load voltage information, determine the second target voltage information.

2. The control method for multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that, The step of configuring the output aggregation module and updating the first target voltage information according to the power supply mode specifically includes: When determining the power supply mode as primary / standby mode; Configure the output aggregation module to single-channel output mode; The first target voltage information remains the same as the load voltage information; The second target voltage information is set to 0.

3. The control method for multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that, The step of configuring the output aggregation module and updating the first target voltage information according to the power supply mode specifically includes: When the power supply mode is determined to be a combined power supply mode; Configure the output aggregation module to a serial output mode; The first PWM signal is set to a preset duty cycle reference value, and then the first flyback voltage information is measured. Based on the first flyback voltage information, the first target voltage information is set; The difference between the load voltage information and the first target voltage information is calculated to obtain the second target voltage information.

4. The control method for multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that, The preset control quantity adjustment algorithm obtains the second PWM signal based on the second target voltage information, specifically as follows: Obtain the second flyback voltage information; The difference between the second flyback voltage and the second target voltage information is calculated to obtain the second deviation information; Based on the preset control quantity adjustment algorithm, the second duty cycle adjustment quantity is obtained according to the second deviation information, which is used to update the second PWM signal.

5. The control method for multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that, The preset control quantity adjustment algorithm is specifically as follows: Obtain voltage deviation information; Based on the voltage deviation information and the preset proportional coefficient, the proportional control quantity is obtained; The integral control quantity is obtained based on the integral value of the voltage deviation information and the preset integral coefficient; Based on the differential value of the voltage deviation information and the preset differential coefficient, the differential control quantity is obtained; The duty cycle adjustment is obtained by calculating the sum of the proportional control quantity, the integral control quantity, and the derivative control quantity.

6. The control method for multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that, Also includes: Obtain the first current information; Determine whether the first current information exceeds a preset current threshold; If so, configure the power supply mode to combined power supply mode; Based on the first current information, the first target voltage information is lowered; Based on the first target voltage information, the second target voltage information is obtained.

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