Control circuit and method of multi-backup power supply based on multi-flyback structure

Abstract

The invention provides a control circuit and method for a multi-backup power supply based on a multi-flyback structure, and the control circuit achieves the combined power supply of a main power supply and a backup power supply through two paths of flyback auxiliary power supply modules and an output summary module, and meets the high-power requirement and the redundant power supply requirement. The input decoupling module is used for realizing complete decoupling of an input side power supply, so that the insulation detection precision is prevented from being reduced; according to the control method, the power supply voltage of the main power supply is adjusted in real time according to the difference value between the main power supply voltage and the first target voltage, when the power supply voltage of the main power supply meets the load requirement, the main-standby mode is configured, and the main power supply independently supplies power; when the power supply voltage of the main power supply does not meet the load requirement, a combined supply mode is configured, and the main power supply and the standby power supply jointly supply power; therefore, high-reliability redundant power supply is realized, and the safety of a power supply system is remarkably improved. In addition, by dynamically adjusting the power supply states of the main power supply and the standby power supply, balanced power distribution is achieved, and power supply flexibility is improved.

Description

Technical Field

[0001] The present invention belongs to the field of flyback power supplies, and more specifically, discloses a control circuit and method for multiple backup power supplies based on a multiple flyback structure. Background Art

[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 put forward higher requirements for the auxiliary power supply of power electronic equipment. High-power equipment (such as inverters and battery management systems) needs to provide stable and highly reliable auxiliary power supply for loads such as cooling fans and control circuits. At the same time, in scenarios such as photovoltaic systems and electric vehicles, the insulation detection accuracy of the input power directly affects the safety of the equipment.

[0003] However, most of the existing auxiliary power supplies are based on a single flyback topology, which is difficult to meet high power requirements and redundant power supply requirements; once the power module fails or the input is powered off, the load power supply will be completely interrupted, which cannot meet the continuous operation requirements of high-reliability scenarios. In addition, the single flyback topology is limited by power density and efficiency bottlenecks. Forcibly increasing the power can easily cause 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), due to the electrical connection on the input side, this coupling will form a leakage current path, interfere with the insulation detection circuit, and cause the detection error to increase. The input side coupling problem will significantly reduce the insulation detection accuracy and lead 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 the present invention is to provide a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit realizes the joint power supply of the main power supply and the backup power supply through two flyback auxiliary power supply modules and an output summary module to meet the high power demand and redundant power supply requirements; the input side power supply is completely decoupled through the input decoupling module to avoid reducing the insulation detection accuracy; the control method adjusts the power supply voltage of the main power supply in real time according to the difference between the main power supply voltage and the first target voltage. When the power supply voltage of the main power supply meets the load demand, it is configured as the main-backup mode, and the main power supply is used alone for power supply; when the power supply voltage of the main power supply does not meet the load demand, it is configured as the joint supply mode, and the main power supply and the backup power supply are used for power supply; thereby realizing high-reliability redundant power supply and significantly improving the safety of the power supply system. In addition, by dynamically adjusting the power supply status of the main and backup power supplies, power balanced distribution is achieved and the flexibility of power supply is improved.

[0006] In order to achieve the above object, the first aspect of the present invention provides a control circuit of a multi-backup power supply based on a multi-flyback structure, the control circuit comprising: At least two flyback auxiliary power modules, one input decoupling module and one output aggregation module; The flyback auxiliary power supply module is used to generate a flyback voltage, and the flyback auxiliary power supply module includes a first input terminal and a first output terminal; The input decoupling module is used to decouple the output of multiple power supplies, and includes at least two second input terminals and at least two second output terminals; The output summarizing module is used for combining the output voltages of a plurality of the flyback auxiliary power supply modules in series, and comprises at least two third input terminals and one third output terminal; The first input terminal of the flyback auxiliary power supply module is connected to a second output terminal of the input decoupling module; The first output terminal of the flyback auxiliary power supply module is connected to a third input terminal of the output summarizing module; The second input terminal of the input decoupling module is connected to a power supply; The third output terminal of the output summarizing module is connected to an electrical load.

[0007] In this solution, the flyback auxiliary power supply module specifically includes: Flyback structure module, PWM generation module, transformer module; The PWM generation module is used to generate a control signal for connecting to the conduction control terminal of the flyback structure module; The flyback structure module generates a flyback signal according to the control signal of the conduction control terminal and the input power supply; The transformer module outputs a flyback voltage according to the flyback signal.

[0008] In this solution, the PWM generation module specifically includes: PWM chip and optocoupler module; The PWM chip is used to generate a PWM signal; The optical coupling module is used to isolate and output the PWM signal to generate the control signal.

[0009] In this solution, the input decoupling module is specifically: Completely decoupling at least two power supplies connected to the second input terminal to obtain mutually independent decoupling voltages; Each second output terminal outputs a decoupling voltage.

[0010] A second aspect of the present invention further provides a control method for a multi-backup power supply based on a multi-flyback structure, which is applied to any of the control circuits of the multi-backup power supply based on a multi-flyback structure described above, and the control method specifically includes: Obtaining first target voltage information according to the load voltage information; Acquiring first flyback voltage information; Calculating a difference between the first flyback voltage and the first target voltage information to obtain first deviation information; Based on a preset control amount adjustment algorithm, a first duty cycle adjustment amount is obtained according to the first deviation information, and is used to update the first PWM signal; Within a preset first time period, determining whether the first deviation information is lower than a preset deviation threshold; If yes, the power supply mode is configured as active / standby mode; If not, the power supply mode is configured as the joint power supply mode; According to the power supply mode, configuring the output summary module and updating the first target voltage information; Obtaining second target voltage information according to the load voltage information and the first target voltage information; Based on a preset control amount adjustment algorithm, a second PWM signal is obtained according to the second target voltage information.

[0011] In this solution, configuring the output summary module and updating the first target voltage information according to the power supply mode are specifically: When it is determined that the power supply mode is the active / standby mode; Configuring the output aggregation module to a single-channel output mode; The first target voltage information remains the same as the load voltage information; The second target information is set to 0.

[0012] In this solution, configuring the output summary module and updating the first target voltage information according to the power supply mode are specifically: When it is determined that the power supply mode is a joint power supply mode; Configuring the output aggregation module to be in series output mode; The first PWM signal is set to a preset duty cycle reference value, and then measured to obtain first flyback voltage information; According to the first flyback voltage information, setting the first target voltage information; A difference between the load voltage information and the first target voltage information is calculated to obtain second target voltage information.

[0013] In this solution, the preset control amount adjustment algorithm is used to obtain the second PWM signal according to the second target voltage information, specifically: Acquiring second flyback voltage information; Calculating a difference between the second flyback voltage and the second target voltage information to obtain second deviation information; Based on a preset control amount adjustment algorithm, a second duty cycle adjustment amount is obtained according to the second deviation information, which is used to update the second PWM signal.

[0014] In this solution, the preset control amount adjustment algorithm is specifically: Get voltage deviation information; Obtaining a proportional control amount according to the voltage deviation information and a preset proportional coefficient; Obtaining an integral control amount according to the integral value of the voltage deviation information and a preset integral coefficient; Obtaining a differential control amount according to the differential value of the voltage deviation information and a preset differential coefficient; The sum of the proportional control amount, the integral control amount and the differential control amount is calculated to obtain the duty cycle adjustment amount.

[0015] This plan also includes: Acquiring first current information; Determining whether the first current information exceeds a preset current threshold; If yes, the power supply mode is configured as the joint power supply mode; According to the first current information, lowering the first target voltage information; The second target voltage information is obtained according to the first target voltage information.

[0016] The present invention provides a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit realizes the joint power supply of the main power supply and the backup power supply through two-way flyback auxiliary power supply modules and an output summary module to meet the high power demand and redundant power supply requirements; the input side power supply is completely decoupled through the input decoupling module to avoid reducing the insulation detection accuracy; the control method adjusts the power supply voltage of the main power supply in real time according to the difference between the main power supply voltage and the first target voltage. When the power supply voltage of the main power supply meets the load demand, it is configured as a main-standby mode, and the main power supply is powered alone; when the power supply voltage of the main power supply does not meet the load demand, it is configured as a joint supply mode, and the main power supply and the backup power supply are jointly powered; thereby realizing high-reliability redundant power supply and significantly improving the safety of the power supply system. In addition, by dynamically adjusting the power supply status of the main and backup power supplies, power balanced distribution is achieved, and the flexibility of power supply is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0018] Figure 1 A schematic diagram of the connection structure of a control circuit of a multi-backup power supply based on a multi-flyback structure is shown; Figure 2 A schematic diagram showing the connection structure of a flyback auxiliary power supply module provided in an embodiment of the present invention is shown; Figure 3 A flow chart showing a method for controlling a multi-backup power supply based on a multi-flyback structure is shown; Figure 4 The operating flow chart of the active-standby mode provided by the embodiment of the present invention is shown; Figure 5 The operating flow chart of the joint power supply mode provided by the embodiment of the present invention is shown. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0021] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0022] Please refer to Figure 1 , Figure 1 The invention shows a connection structure schematic diagram of a control circuit of a multi-backup power supply based on a multi-flyback structure.

[0023] like Figure 1 As shown, the first aspect of the present invention discloses a control circuit of a multi-backup power supply based on a multi-flyback structure, and the circuit comprises: At least two flyback auxiliary power supply modules 1021 / 1022, one input decoupling module 101 and one output aggregation module 103; The flyback auxiliary power supply module is used to generate a flyback voltage, and the flyback auxiliary power supply module includes a first input terminal and a first output terminal; The input decoupling module is used to decouple the output of multiple power supplies, and includes at least two second input terminals and at least two second output terminals; The output summarizing module is used for combining the output voltages of a plurality of the flyback auxiliary power supply modules in series, and comprises at least two third input terminals and one third output terminal; The first input terminal of the flyback auxiliary power supply module is connected to a second output terminal of the input decoupling module; The first output terminal of the flyback auxiliary power supply module is connected to a third input terminal of the output summarizing module; The second input terminal of the input decoupling module is connected to a power supply; The third output terminal of the output summarizing module is connected to an electrical load.

[0024] It should be noted that the first input end is the power input end of the flyback auxiliary power supply module, which is used to receive the power supply from the input decoupling module; the first output end is the power output end of the flyback auxiliary power supply module, which is used to output the flyback voltage; the second input end is the power supply connection port of the input decoupling module; the second output end is the decoupling power output port of the input decoupling module; the third input end is the flyback power connection port of the output summary module; and the third input end is the load power output port of the output summary module.

[0025] In this embodiment, at least two power supplies V1 / V2 provide power supply to the control circuit, and are connected to the control circuit from the input decoupling module. The input decoupling module completely decouples the power supply, disconnects the electrical connection between the two power supplies, and realizes electrical insulation to avoid reducing the insulation detection accuracy. The input decoupling module connects the decoupled power supply to different flyback auxiliary power supply modules, respectively, to generate at least two flyback voltages. The output summary module receives at least two flyback voltages, switches the output channel according to the configured power supply mode, and provides power supply to the load. By combining power supply from at least two power supplies, high-reliability redundant power supply is achieved, significantly improving the safety of the power supply system.

[0026] Please refer to Figure 2 , Figure 2 A schematic diagram of the connection structure of a flyback auxiliary power supply module provided in an embodiment of the present invention is shown.

[0027] According to an embodiment of the present invention, Figure 2 As shown, the flyback auxiliary power supply module specifically includes: Flyback structure module 202, PWM generation module 201, transformer module 203; The PWM generation module is used to generate a control signal for connecting to the conduction control terminal of the flyback structure module; The flyback structure module generates a flyback signal according to the control signal of the conduction control terminal and the input power supply; The transformer module outputs a flyback voltage according to the flyback signal.

[0028] It should be noted that the flyback auxiliary power supply module generates a PWM signal through a PWM generation module, wherein the PWM generation module can adjust the frequency and duty cycle of the PWM signal. The transistor of the flyback structure module generates a flyback signal according to the PWM signal, and combines the power supply of the flyback auxiliary power supply module to act on the transformer primary of the transformer module to generate a flyback voltage. The flyback voltages output by the transformer module are isolated from each other, further improving the insulation between the power supply voltages.

[0029] According to an embodiment of the present invention, the PWM generation module specifically includes: PWM chip and optocoupler module; The PWM chip is used to generate a PWM signal; The optical coupling module is used to isolate and output the PWM signal to generate the control signal.

[0030] It should be noted that the PWM chip outputs a PWM signal with a set frequency and duty cycle according to the control signal or communication data. The optocoupler module isolates and outputs the PWM signal generated by the PWM chip and transmits the output signal to the flyback structure module, thereby realizing the isolated transmission of the PWM signal.

[0031] According to an embodiment of the present invention, the input decoupling module is specifically: Completely decoupling at least two power supplies connected to the second input terminal to obtain mutually independent decoupling voltages; Each second output terminal outputs a decoupling voltage.

[0032] 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, and the input decoupling module completely decouples the input power supply and transmits it to the corresponding output terminal, thereby avoiding the problem of reduced insulation detection accuracy due to the electrical coupling characteristics between the input power supplies.

[0033] Please refer to Figure 3 , Figure 3 A flow chart of a control method for multiple backup power supplies based on a multiple flyback structure is shown.

[0034] 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, and the method specifically includes: S302, obtaining first target voltage information according to the load voltage information; S304, obtaining first flyback voltage information; S306, calculating a difference between the first flyback voltage and the first target voltage information to obtain first deviation information; S308, based on a preset control amount adjustment algorithm, obtain a first duty cycle adjustment amount according to the first deviation information, for updating the first PWM signal; S310, within a preset first time period, determining whether the first deviation information is lower than a preset deviation threshold; S312, if yes, configure the power supply mode to the active / standby mode; S314, if not, configuring the power supply mode to a joint power supply mode; S316, configuring the output summary module and updating the first target voltage information according to the power supply mode; S318, obtaining second target voltage information according to the load voltage information and the first target voltage information; S320, based on a preset control amount adjustment algorithm, obtain a second PWM signal according to the second target voltage information.

[0035] It should be noted that the load voltage information is the power supply voltage value required by the load. The first flyback voltage information is the flyback voltage generated by the first flyback auxiliary power supply module, that is, the output voltage of the main power supply. Hereinafter, the main power supply is used to represent 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 supply module, that is, 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 supply module. The second flyback voltage information is the flyback voltage generated by the second flyback auxiliary power supply module, that is, the output voltage of the backup power supply. Hereinafter, the backup power supply is used to represent 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 supply module, that is, 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 supply module. The main-standby mode is a working mode in which the main power supply is output alone and the backup power supply is in standby state; the joint supply mode is a working mode in which the main power supply and the backup power supply are output in proportion.

[0036] In this embodiment, the PWM duty cycle of the main power supply is adjusted so that the main power supply voltage meets the load voltage requirement. If the main power supply voltage can meet the load voltage requirement, the power supply mode is configured as the main-standby mode, and the main power supply supplies power alone. If the main power supply voltage cannot meet the load voltage requirement, the power supply mode is configured as the joint supply mode, and the main power supply and the standby power supply supply power together according to the power supply requirement. The specific implementation process is: First, the target voltage of the main power supply is set according to the power supply voltage value required by the load, and then based on the preset control quantity adjustment algorithm, the first duty cycle adjustment amount is calculated according to 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. Secondly, within the preset first time period, it is determined whether the output voltage of the main power supply can meet the power supply demand of the load voltage; if it is satisfied, it is set to the main-standby mode, and the output summary module is configured to be powered by the main power supply alone; if it is not satisfied, it is set to the joint supply mode, and the output summary module is configured to be powered by the main power supply and the backup power supply. Then, based on the power supply situation, the target power 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 backup power supply. Finally, based on the preset control quantity adjustment algorithm, the PWM signal of the backup power supply is obtained according to the target voltage of the backup power supply.

[0037] Please refer to Figure 4 , Figure 4 The operating flow chart of the active-standby mode provided by an embodiment of the present invention is shown.

[0038] In the embodiment of the present invention, Figure 4 As shown, configuring the output summary module and updating the first target voltage information according to the power supply mode is specifically as follows: S402, when determining that the power supply mode is an active / standby mode; S404, configuring the output aggregation module to a single-channel output mode; S406, the first target voltage information remains the same as the load voltage information; S408: The second target information is set to 0.

[0039] It should be noted that in this embodiment, the main-standby mode operation process provided is specifically as follows: when switching to the main-standby mode, the output summary module is configured as a single-channel output mode; the first target voltage information remains the same as the load voltage information. As an implementation method, when switching to the main-standby mode, the output summary module is configured so that the load is provided with voltage by the main power supply output voltage, that is, it is configured as a single-channel output mode. In addition, the target voltage of the main power supply is set to be the same as the load voltage, indicating that the main power supply provides power to the load; the target voltage of the backup power supply is set to 0, indicating that the backup power supply does not need to provide power.

[0040] Please refer to Figure 5 , Figure 5 The operating flow chart of the joint power supply mode provided by the embodiment of the present invention is shown.

[0041] In the embodiment of the present invention, Figure 5 As shown, configuring the output summary module and updating the first target voltage information according to the power supply mode is specifically as follows: S502, when it is determined that the power supply mode is a joint power supply mode; S504, configuring the output aggregation module to be in series output mode; S506, setting the first PWM signal to a preset duty cycle reference value, and then measuring to obtain first flyback voltage information; S508, setting the first target voltage information according to the first flyback voltage information; S510, calculating a difference between the load voltage information and the first target voltage information to obtain second target voltage information.

[0042] It should be noted that, in this embodiment, the operation process of the joint supply mode provided is specifically as follows: when switching to the joint supply mode, the output summary 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; according to the first flyback voltage information, the first target voltage information is set; according to the first target voltage information, the second target voltage information is obtained. As an implementation method, when switching to the joint supply mode, the output summary module is configured so that the load is provided with voltage after the output voltages of the main power supply and the backup power supply are connected in series, that is, it is 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 to 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. Among them, the output summary module realizes voltage isolation and superposition through a diode or an active switching circuit to ensure that there is no conflict in the output of the main and backup power supplies.

[0043] In the embodiment of the present invention, the preset control amount adjustment algorithm is used to obtain the second PWM signal according to the second target information, specifically: Acquiring second flyback voltage information; Calculating a difference between the second flyback voltage and the second target voltage information to obtain second deviation information; Based on a preset control amount adjustment algorithm, a second duty cycle adjustment amount is obtained according to the second deviation information, which is used to update the second PWM signal.

[0044] It should be noted that in this embodiment, an output adjustment process of the backup power supply is provided, specifically: the output voltage of the backup power supply is measured, and a second voltage deviation value is obtained according to 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 amount is calculated according to the second voltage deviation value, which is used to update the duty cycle of the PWM signal of the backup power supply to achieve voltage regulation of the backup power supply.

[0045] In the embodiment of the present invention, the preset control amount adjustment algorithm is specifically: Get voltage deviation information; Obtaining a proportional control amount according to the voltage deviation information and a preset proportional coefficient; Obtaining an integral control amount according to the integral value of the voltage deviation information and a preset integral coefficient; Obtaining a differential control amount according to the differential value of the voltage deviation information and a preset differential coefficient; The sum of the proportional control amount, the integral control amount and the differential control amount is calculated to obtain the duty cycle adjustment amount.

[0046] It should be noted that, in this embodiment, a feedback regulation algorithm is used to achieve voltage regulation of the main power supply or the backup power supply. The voltage deviation information is the deviation value between the output voltage of the main power supply or the backup power supply and the target voltage. As an implementation method, the proportional control amount is calculated based on the voltage deviation value and the preset proportional coefficient; the integral control amount is calculated based on the integral value of the voltage deviation value and the preset integral coefficient; the differential control amount is calculated based on the differential value of the voltage deviation value and the preset differential number to obtain the differential control amount; finally, the sum of the proportional control amount, the integral control amount and the differential control amount is calculated to obtain the duty cycle regulation amount. The proportional coefficient controls the speed of output voltage regulation, and the integral coefficient and the differential coefficient control the stability of output voltage regulation; that is, by adjusting the proportional coefficient, the integral coefficient or the differential coefficient, it is used to control the output voltage regulation efficiency and the regulation stability.

[0047] In an embodiment of the present invention, it also includes: Acquiring first current information; Determining whether the first current information exceeds a preset current threshold; If yes, the power supply mode is configured as the joint power supply mode; According to the first current information, lowering the first target voltage information; The second target voltage information is obtained according to the first target voltage information.

[0048] It should be noted that the first current information is the working current of the flyback auxiliary power supply module of the main power supply. When the first current information exceeds the preset current threshold, it means that the current of the main power supply is too high, and there is a risk of abnormal operation or damage. At this time, the power supply mode is configured as the joint supply mode, and the backup power supply is used for auxiliary power supply. First, according to the first current information, the voltage reduction value is determined to reduce the target voltage of the main power supply; then, according to the difference between the load voltage and the target voltage in 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 supply is provided to reduce the power supply load of the main power supply and avoid damage to the main power supply due to excessive current, thereby improving the operating reliability and safety of the power supply circuit.

[0049] It is worth mentioning that it also includes: Acquiring first temperature information; Determining whether the first temperature information exceeds a preset temperature threshold; If yes, then lower the first PWM signal, and then measure to obtain the first flyback voltage information; The first target voltage information is set and the second target voltage information is updated according to the first flyback voltage information.

[0050] It should be noted that the first temperature information is the operating temperature of the main power supply circuit. When the first temperature information exceeds the preset temperature threshold, it means that the temperature of the main power supply is too high, and there is a risk of abnormal operation or damage. At this time, the duty cycle of the PWM signal of the main power supply is lowered, that is, the power supply load of the main power supply is lowered, and the first target voltage information is set according to the adjusted main power supply output voltage. Finally, the target voltage of the backup power supply is obtained based on the difference between the load voltage and the target voltage in the main power supply. By driving the flyback auxiliary power supply module of the backup power supply, auxiliary power supply is provided to reduce the power supply load of the main power supply and avoid damage to the main power supply due to excessive temperature, thereby improving the operational reliability and safety of the power supply circuit.

[0051] It is worth mentioning that it also includes: In a photovoltaic power supply system, the main power is provided by the photovoltaic array and the backup power is provided by a lithium battery pack; When it is determined that the power supply mode is the active / standby mode; When the photovoltaic power generation power is lower than the preset first power generation power 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 joint power supply mode.

[0052] It should be noted that in a photovoltaic power supply system, the voltage generated by the photovoltaic array is usually used as the main power supply, and the voltage output by the lithium battery pack is used as the backup power supply; the load in the photovoltaic system includes an inverter and a radiator. When in the main-backup mode, when the power generation power of the photovoltaic array is lower than the preset first power generation power threshold due to reduced light intensity, it means that the main power supply is at risk of being insufficient to meet the load demand. If the output voltage of the main power supply is still lower than the load demand after adjusting the main power supply PWM signal, the power supply mode is configured as a joint power supply mode, with the main power supply responsible for the inverter load and the backup power supply responsible for the radiator load.

[0053] It is worth mentioning that it also includes: In a photovoltaic power supply system, the main power is provided by the photovoltaic array and the backup power is provided by a lithium battery pack; When it is determined that the power supply mode is the active / standby mode; When the photovoltaic power generation power is lower than the preset second power generation power threshold; Confirm the load voltage information according to the power supply requirements of the cooling system; The second target voltage information is determined according to the load voltage information.

[0054] It should be noted that in a photovoltaic power supply system, the voltage generated by the photovoltaic array is usually used as the main power supply, and the voltage output by the lithium battery pack is used as the backup power supply; wherein, the load in the photovoltaic system includes an inverter and a radiator. When the photovoltaic array is unable to generate electricity or the power generation is lower than the preset second power generation threshold due to environmental factors, the power supply capacity of the main power supply is insufficient. At this time, the inverter load demand may decrease, and the backup power supply needs to take over part of the load. However, in order to ensure the continuous operation of the cooling system, the load voltage information will be determined according to the load of the radiator to set the target voltage value of the backup power supply. In other words, when the photovoltaic array is not generating electricity, the backup power supply provides power to the radiator to ensure the safe operation of the photovoltaic system.

[0055] In summary, the present invention provides a control circuit and method for multiple backup power supplies based on a multi-flyback structure. The control circuit realizes the joint power supply of the main power supply and the backup power supply through two-way flyback auxiliary power supply modules and an output summary module to meet the high power demand and redundant power supply requirements; the input side power supply is completely decoupled through the input decoupling module to avoid reducing the insulation detection accuracy; the control method adjusts the power supply voltage of the main power supply in real time according to the difference between the main power supply voltage and the first target voltage. When the power supply voltage of the main power supply meets the load demand, it is configured as the main-backup mode, and the main power supply is used alone for power supply; when the power supply voltage of the main power supply does not meet the load demand, it is configured as the joint supply mode, and the main power supply and the backup power supply are used for power supply; thereby realizing high-reliability redundant power supply and significantly improving the safety of the power supply system. In addition, by dynamically adjusting the power supply status of the main and backup power supplies, power balanced distribution is achieved and the flexibility of power supply is improved.

[0056] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0057] If the 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, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0058] The above description is only a preferred embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A control circuit of a multi-backup power supply based on a multi-flyback structure, characterized in that: The control circuit comprises: At least two flyback auxiliary power modules, one input decoupling module and one output aggregation module; The flyback auxiliary power supply module is used to generate a flyback voltage, and the flyback auxiliary power supply module includes a first input terminal and a first output terminal; The input decoupling module is used to decouple the output of multiple power supplies, and includes at least two second input terminals and at least two second output terminals; The output summarizing module is used for combining the output voltages of a plurality of the flyback auxiliary power supply modules in series, and comprises at least two third input terminals and one third output terminal; The first input terminal of the flyback auxiliary power supply module is connected to a second output terminal of the input decoupling module; The first output terminal of the flyback auxiliary power supply module is connected to a third input terminal of the output summarizing module; The second input terminal of the input decoupling module is connected to a power supply; The third output terminal of the output summarizing module is connected to an electrical load.

2. The control circuit of multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that: The flyback auxiliary power supply module specifically includes: Flyback structure module, PWM generation module, transformer module; The PWM generation module is used to generate a control signal for connecting to the conduction control terminal of the flyback structure module; The flyback structure module generates a flyback signal according to the control signal of the conduction control terminal and the input power supply; The transformer module outputs a flyback voltage according to the flyback signal.

3. The control circuit of multiple backup power supplies based on a multi-flyback structure according to claim 2, characterized in that: The PWM generation module specifically includes: PWM chip and optocoupler module; The PWM chip is used to generate a PWM signal; The optical coupling module is used to isolate and output the PWM signal to generate the control signal.

4. The control circuit of multiple backup power supplies based on a multi-flyback structure according to claim 1, characterized in that: The input decoupling module is specifically: Completely decoupling at least two power supplies connected to the second input terminal to obtain mutually independent decoupling voltages; Each second output terminal outputs a decoupling voltage.

5. A control method of a multi-backup power supply based on a multi-flyback structure, applied to a control circuit of a multi-backup power supply based on a multi-flyback structure as claimed in any one of claims 1 to 4, characterized in that: The control method specifically includes: Obtaining first target voltage information according to the load voltage information; Acquiring first flyback voltage information; Calculating a difference between the first flyback voltage and the first target voltage information to obtain first deviation information; Based on a preset control amount adjustment algorithm, a first duty cycle adjustment amount is obtained according to the first deviation information, and is used to update the first PWM signal; Within a preset first time period, determining whether the first deviation information is lower than a preset deviation threshold; If yes, the power supply mode is configured as active / standby mode; If not, configure the power supply mode to joint power supply mode; According to the power supply mode, configuring the output summary module and updating the first target voltage information; Obtaining second target voltage information according to the load voltage information and the first target voltage information; Based on a preset control amount adjustment algorithm, a second PWM signal is obtained according to the second target voltage information.

6. The control method of multiple backup power supplies based on a multi-flyback structure according to claim 5, characterized in that: The configuring the output summary module and updating the first target voltage information according to the power supply mode is specifically: When it is determined that the power supply mode is the active / standby mode; Configuring the output aggregation module to a single-channel output mode; The first target voltage information remains the same as the load voltage information; The second target information is set to 0.

7. The control method of multiple backup power supplies based on multiple flyback structures according to claim 5, characterized in that: The configuring the output summary module and updating the first target voltage information according to the power supply mode is specifically: When it is determined that the power supply mode is a joint power supply mode; Configuring the output aggregation module to be in series output mode; The first PWM signal is set to a preset duty cycle reference value, and then measured to obtain first flyback voltage information; According to the first flyback voltage information, setting the first target voltage information; A difference between the load voltage information and the first target voltage information is calculated to obtain second target voltage information.

8. The control method of multiple backup power supplies based on multiple flyback structures according to claim 5, characterized in that: The second PWM signal is obtained based on the preset control amount adjustment algorithm according to the second target voltage information, specifically: Acquiring second flyback voltage information; Calculating a difference between the second flyback voltage and the second target voltage information to obtain second deviation information; Based on a preset control amount adjustment algorithm, a second duty cycle adjustment amount is obtained according to the second deviation information, which is used to update the second PWM signal.

9. The control method of multiple backup power supplies based on multiple flyback structures according to claim 5, characterized in that: The preset control amount adjustment algorithm is specifically: Get voltage deviation information; Obtaining a proportional control amount according to the voltage deviation information and a preset proportional coefficient; Obtaining an integral control amount according to the integral value of the voltage deviation information and a preset integral coefficient; Obtaining a differential control amount according to the differential value of the voltage deviation information and a preset differential coefficient; The sum of the proportional control amount, the integral control amount and the differential control amount is calculated to obtain the duty cycle adjustment amount.

10. The control method of multiple backup power supplies based on multiple flyback structures according to claim 5, characterized in that: Also includes: Acquiring first current information; Determining whether the first current information exceeds a preset current threshold; If yes, the power supply mode is configured as the joint power supply mode; According to the first current information, lowering the first target voltage information; The second target voltage information is obtained according to the first target voltage information.

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