Mppt circuit control method, mppt circuit and energy storage device

Abstract

The application provides an MPPT circuit control method, an MPPT circuit and an energy storage device. The method comprises the following steps: detecting a first voltage and a first current input by a first branch and a second voltage and a second current input by a second branch in real time; determining a working state of the MPPT circuit according to the first voltage and the second voltage; and adjusting the power of a target branch through a first voltage boosting circuit or a second voltage boosting circuit according to the power difference between the first branch and the second branch when the MPPT circuit is in a pressure difference state. In the embodiment of the application, when the MPPT circuit is in the pressure difference state, the power of the target branch with lower power is dynamically adjusted, so that the power of the target branch is the same as the power of another branch except the target branch in the MPPT circuit, thereby ensuring that each branch works with the maximum power supported by the MPPT circuit, and further maximizing the use of light energy and improving the working efficiency of the MPPT circuit.

Description

Technical Field

[0001] This invention relates to the field of circuit technology, and in particular to an MPPT circuit control method, an MPPT circuit, and an energy storage device. Background Technology

[0002] With the development of clean energy technologies, photovoltaic technology has been widely applied and promoted. In order to improve energy storage efficiency, energy storage devices are usually used, which include photovoltaic modules and maximum power point tracking (MPPT) circuits. The multiple photovoltaic modules are connected to the input side of a dual-path MPPT circuit through connecting lines, wherein each photovoltaic module is connected to one MPPT circuit.

[0003] However, each MPPT circuit operates independently. When the voltages of the two circuits are different, each circuit uses its own maximum power. This means that the dual-channel MPPT circuit cannot use light energy to its maximum efficiency, resulting in energy waste. Summary of the Invention

[0004] The main objective of this invention is to provide an MPPT circuit control method, an MPPT circuit, and an energy storage device, aiming to solve the problem that existing dual-channel MPPT circuits cannot utilize light energy to the maximum efficiency, resulting in energy waste.

[0005] To achieve the above objectives, the present invention provides an MPPT circuit control method applied to an MPPT circuit. The MPPT circuit includes a first branch, a second branch, a first boost circuit, a second boost circuit, and a controller. The method is applied to the controller and includes:

[0006] Real-time detection of the first voltage and first current input to the first branch, and the second voltage and second current input to the second branch;

[0007] The operating state of the MPPT circuit is determined based on the first voltage and the second voltage.

[0008] When the MPPT circuit is in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the power difference between the first branch and the second branch, so that the power of the target branch is the same as the power of the other branch in the MPPT circuit excluding the target branch.

[0009] The power difference is determined based on the first voltage, the first current, the second voltage, and the second current, and the target branch is the branch with lower power between the first branch and the second branch.

[0010] Optionally, the operating state of the MPPT circuit is determined based on the first voltage and the second voltage, including:

[0011] The absolute value of the difference between the first voltage and the second voltage is defined as the voltage difference.

[0012] If the voltage difference is not equal to 0, or the voltage difference is greater than a preset threshold, the MPPT circuit is determined to be in a voltage difference state; the preset threshold is a positive integer greater than 0.

[0013] If the voltage difference is equal to 0, or if the voltage difference is less than or equal to a preset threshold, the MPPT circuit is determined to be not in a voltage difference state.

[0014] Optionally, adjusting the power of the target branch based on the power difference between the first branch and the second branch via a first boost circuit or a second boost circuit includes:

[0015] Calculate the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch;

[0016] When the power difference is not equal to the first power or the second power, the power of the target branch is adjusted by the first boost circuit or the second boost circuit.

[0017] Optionally, calculating the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch includes:

[0018] The ratio between the current difference and the voltage difference is determined as the power difference between the first branch and the second branch; the current difference is the absolute value of the difference between the first current and the second current, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0019] The ratio between the first current and the first voltage is defined as the first power;

[0020] The ratio between the second current and the second voltage is defined as the second power.

[0021] Optionally, adjusting the power of the target branch via a first boost circuit or a second boost circuit includes:

[0022] The voltage of the target branch is increased by the first or second boost circuit so that the voltage of the target branch is the sum of the initial voltage and the voltage difference, where the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0023] Optionally, after determining the operating state of the MPPT circuit based on the first voltage and the second voltage, the method further includes:

[0024] When the MPPT circuit is not in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the current difference.

[0025] The current difference is the absolute value of the difference between the first current and the second current.

[0026] Optionally, the power of the target branch is adjusted via a first boost circuit or a second boost circuit based on the current difference, including:

[0027] When the current difference is not equal to 0, the voltage of the target branch is increased by the first boost circuit or the second boost circuit so that the voltage of the target branch is the sum of the initial voltage and the voltage difference, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0028] In addition, to achieve the above objectives, the present invention also provides an MPPT circuit, including a first branch, a second branch, a first boost circuit, a second boost circuit, and a controller;

[0029] The output terminal of the first branch is electrically connected to the input terminal of the first boost circuit, the control terminal of the first branch is communicatively connected to the controller, and the control terminal of the first boost circuit is communicatively connected to the controller.

[0030] The output terminal of the second branch is electrically connected to the input terminal of the second boost circuit, the control terminal of the second branch is communicatively connected to the controller, and the control terminal of the second boost circuit is communicatively connected to the controller.

[0031] The controller is used for:

[0032] Real-time detection of the first voltage and first current input to the first branch, and the second voltage and second current input to the second branch;

[0033] The operating state of the MPPT circuit is determined based on the first voltage and the second voltage.

[0034] When the MPPT circuit is in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the power difference between the first branch and the second branch, so that the power of the target branch is the same as the power of the other branch in the MPPT circuit excluding the target branch.

[0035] The power difference is determined based on the first voltage, the first current, the second voltage, and the second current, and the target branch is the branch with lower power between the first branch and the second branch.

[0036] Optionally, the MPPT circuit may also include resistors;

[0037] The first end of the resistor is electrically connected to the first boost circuit, and the second end of the resistor is electrically connected to the second boost circuit.

[0038] In addition, to achieve the above objectives, the present invention also provides an energy storage device configured to implement the MPPT circuit control method described above, or the energy storage device includes the MPPT circuit described above.

[0039] This invention provides an MPPT circuit control method, an MPPT circuit, and an energy storage device. The method includes: real-time detection of a first voltage and a first current input to a first branch, and a second voltage and a second current input to a second branch; determining the operating state of the MPPT circuit based on the first and second voltages; and, when the MPPT circuit is in a differential voltage state, adjusting the power of a target branch based on the power difference between the first and second branches using a first or second boost circuit, so that the power of the target branch is the same as the power of another branch in the MPPT circuit excluding the target branch. In this embodiment, when the MPPT circuit is in a differential voltage state, i.e., when the voltages of the two branches included in the MPPT circuit are different, the power of the target branch with lower power is dynamically adjusted so that the power of the target branch is the same as the power of another branch in the MPPT circuit excluding the target branch. This ensures that each branch operates at the maximum power supported by the MPPT circuit, thereby maximizing the efficiency of light energy utilization, avoiding energy waste, and improving the operating efficiency of the MPPT circuit. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0041] Figure 1 A flowchart illustrating the MPPT circuit control method provided in an embodiment of the present invention;

[0042] Figure 2 This is an application flowchart of the MPPT circuit control method provided in an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the MPPT circuit provided in an embodiment of the present invention.

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0045] Explanation of icon numbers:

[0046] label name label name 210 First branch road 240 Second boost circuit 220 Second branch road 250 controller 230 First boost circuit R resistance Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0050] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0051] Please see Figure 1 , Figure 1 This is a flowchart illustrating the MPPT circuit control method provided in an embodiment of the present invention. The MPPT circuit control method provided in this embodiment is applied to an MPPT circuit, which includes a first branch, a second branch, a first boost circuit, a second boost circuit, and a controller. The method is applied to the controller, such as... Figure 1 As shown, the method includes:

[0052] S110, which detects in real time the first voltage and first current input to the first branch, and the second voltage and second current input to the second branch.

[0053] It should be understood that the first branch mentioned above is also called the first photovoltaic (PV) input circuit, and the second branch mentioned above is also called the second photovoltaic input current. The input of both the first branch and the second branch is solar energy.

[0054] In this step, the voltage and current input to the first branch are detected in real time. The voltage is referred to as the first voltage and the current as the first current. The voltage and current input to the second branch are detected in real time. The voltage is referred to as the second voltage and the current as the second current.

[0055] S120 determines the operating state of the MPPT circuit based on the first voltage and the second voltage.

[0056] In this step, the operating state of the MPPT circuit can be determined based on the first voltage of the first branch and the second current of the second branch. The operating state includes a differential voltage state and a non-differential voltage state. The differential voltage state indicates that there is a stored voltage difference or an excessively large voltage difference between the first and second branches, while the non-differential voltage state indicates that there is no voltage difference or a small voltage difference between the first and second branches.

[0057] S130, when the MPPT circuit is in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the power difference between the first branch and the second branch, so that the power of the target branch is the same as the power of the other branch in the MPPT circuit excluding the target branch.

[0058] In this step, when the MPPT circuit is in a differential voltage state, it means that the first voltage of the first branch and the second voltage of the second branch are different. Then, based on the power difference between the first branch and the second branch, the power of the target branch is adjusted by the first boost circuit or the second boost circuit, so that the adjusted power of the target branch is the same as the power of the other branch, that is, the power of the two branches in the adjusted MPPT circuit is the same.

[0059] The power difference is determined based on the first voltage, the first current, the second voltage, and the second current. The target branch is the branch with lower power between the first branch and the second branch.

[0060] It should be noted that the first boost circuit in this step is used to adjust the voltage of the first branch, and the second boost circuit is used to adjust the voltage of the second branch. By adjusting the voltage of the first or second branch through the first or second boost circuit, the power of the first or second branch can be adjusted.

[0061] In this embodiment of the invention, when the MPPT circuit is in a differential voltage state, that is, when the voltages of the two branches included in the MPPT circuit are different, the power of the target branch with lower power is dynamically adjusted so that the power of the target branch is the same as the power of the other branch in the MPPT circuit. This ensures that each branch operates at the maximum power supported by the MPPT circuit, thereby maximizing the use of light energy, avoiding energy waste, and improving the working efficiency of the MPPT circuit.

[0062] Optionally, the operating state of the MPPT circuit is determined based on the first voltage and the second voltage, including:

[0063] The absolute value of the difference between the first voltage and the second voltage is defined as the voltage difference.

[0064] If the voltage difference is not equal to 0, or the voltage difference is greater than a preset threshold, the MPPT circuit is determined to be in a voltage difference state; the preset threshold is a positive integer greater than 0.

[0065] If the voltage difference is equal to 0, or if the voltage difference is less than or equal to a preset threshold, the MPPT circuit is determined to be not in a voltage difference state.

[0066] In this embodiment, the absolute value of the difference between the first voltage and the second voltage is calculated, and the absolute value is determined as the voltage difference.

[0067] In one optional implementation, if the voltage difference is not equal to 0, it indicates that there is a voltage difference between the first branch and the second branch, and the MPPT circuit is determined to be in a voltage difference state; if the voltage difference is equal to 0, it indicates that there is no voltage difference between the first branch and the second branch, and the MPPT circuit is determined not to be in a voltage difference state.

[0068] Alternatively, a custom preset threshold is set in advance. If the voltage difference between the first branch and the second branch is large, the MPPT circuit is determined to be in a differential voltage state. The preset threshold is a positive integer greater than 0.

[0069] Specifically, if the voltage difference is greater than a preset threshold, it indicates that there is a large voltage difference between the first branch and the second branch, and the MPPT circuit is determined to be in a voltage difference state; if the voltage difference is less than or equal to the preset threshold, it indicates that there is no voltage difference or a small voltage difference between the first branch and the second branch, and the MPPT circuit is determined not to be in a voltage difference state.

[0070] In this embodiment, the voltage difference between the first voltage and the second voltage is calculated, and the operating state of the MPPT circuit is accurately determined based on the relationship between the voltage difference and 0 or a preset threshold.

[0071] Optionally, adjusting the power of the target branch based on the power difference between the first branch and the second branch via a first boost circuit or a second boost circuit includes:

[0072] Calculate the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch;

[0073] When the power difference is not equal to the first power or the second power, the power of the target branch is adjusted by the first boost circuit or the second boost circuit.

[0074] In this embodiment, the first power of the first branch, the second power of the second branch, and the power difference between the first and second branches are calculated. The power difference is determined based on the first current, the first voltage, the second current, and the second voltage. For details on how to calculate the power difference between the first and second branches, please refer to subsequent embodiments.

[0075] If the power difference is not equal to the first power or the second power, it indicates that the power of the first branch is different from the power of the second branch. In this case, the power of the first branch is adjusted by the first boost circuit, or the power of the second branch is adjusted by the second boost circuit. Optionally, the boost circuit is a BOOST circuit.

[0076] In this embodiment, when the power of the first branch is different from that of the second branch, the power of the target branch with lower power is dynamically adjusted to ensure that each branch operates at the maximum power supported by the MPPT circuit, thereby maximizing the use of light energy and avoiding energy waste.

[0077] In other embodiments, if the power difference is equal to the first power and the second power, it means that the power of the first branch is the same as the power of the second branch, and there is no need to adjust the power of the first branch and the power of the second branch.

[0078] The following details how to calculate the first power, the second power, and the power difference:

[0079] Optionally, calculating the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch includes:

[0080] The ratio between the current difference and the voltage difference is determined as the power difference between the first branch and the second branch; the current difference is the absolute value of the difference between the first current and the second current, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0081] The ratio between the first current and the first voltage is defined as the first power;

[0082] The ratio between the second current and the second voltage is defined as the second power.

[0083] In this embodiment, the ratio between the first current and the first voltage can be determined as the first power of the first branch; and the ratio between the second current and the second voltage can be determined as the second power of the second branch.

[0084] In this embodiment, the absolute value of the difference between the first current and the second current is calculated, and this absolute value is called the current difference; the absolute value of the difference between the first voltage and the second voltage is calculated, and this absolute value is called the voltage difference. Then, the ratio between the current difference and the voltage difference is determined as the power difference between the first branch and the second branch.

[0085] Optionally, adjusting the power of the target branch via a first boost circuit or a second boost circuit includes:

[0086] The voltage of the target branch is increased by the first or second boost circuit so that the voltage of the target branch is the sum of the initial voltage and the voltage difference, where the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0087] In one optional implementation, if the first branch is the target branch, the voltage of the first branch is increased by the first boost circuit so that the voltage of the first branch is the sum of the initial voltage and the voltage difference.

[0088] Another alternative implementation is that, if the second branch is the target branch, the voltage of the second branch is increased by the second boost circuit so that the voltage of the second branch is the sum of the initial voltage and the voltage difference.

[0089] As in the above embodiment, the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0090] Optionally, after determining the operating state of the MPPT circuit based on the first voltage and the second voltage, the method further includes:

[0091] When the MPPT circuit is not in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the current difference.

[0092] The current difference is the absolute value of the difference between the first current and the second current.

[0093] In this embodiment, when the MPPT circuit is not in a differential voltage state, it means that the first voltage of the first branch and the second voltage of the second branch are the same. Then, based on the current difference, it is further determined whether to adjust the power of the target branch.

[0094] The aforementioned current difference is the absolute value of the difference between the first current and the second current.

[0095] In this embodiment, when the MPPT circuit is not in a differential voltage state, the power of the target branch is adjusted according to the current difference to ensure that each branch operates at the maximum power supported by the MPPT circuit, thereby maximizing the use of light energy and avoiding energy waste.

[0096] Optionally, the power of the target branch is adjusted via a first boost circuit or a second boost circuit based on the current difference, including:

[0097] When the current difference is not equal to 0, the voltage of the target branch is increased by the first boost circuit or the second boost circuit so that the voltage of the target branch is the sum of the initial voltage and the voltage difference, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

[0098] In this embodiment, if the current difference is not equal to 0, it indicates that the first power of the first branch is different from the second power of the second branch. Then, the voltage of the target branch is increased by the first boost circuit or by the second boost circuit, and the voltage of the target branch is adjusted to the sum of the initial voltage and the voltage difference, so that each branch can operate at the maximum power supported by the MPPT circuit.

[0099] The voltage difference mentioned above is the absolute value of the difference between the first voltage and the second voltage.

[0100] In other embodiments, if the current difference is equal to 0, it means that the first power of the first branch is the same as the second power of the second branch, and there is no need to adjust the power of the first branch or the power of the second branch.

[0101] For a better understanding of the overall technical solution, please refer to [link / reference]. Figure 2 ,like Figure 2 As shown, one implementation flow of the MPPT circuit control method provided in this embodiment of the invention is as follows: First, measure the first current and first voltage of the first branch, and the second current and second voltage of the second branch. Calculate the current difference based on the first current and second current, and calculate the voltage difference based on the first voltage and second voltage. If the voltage difference is not equal to 0, it is determined that the MPPT circuit is in a voltage difference state. Further, determine whether the power difference is equal to the first power of the first circuit or the second power of the second circuit, wherein the power difference is determined based on the first current, first voltage, second current, and second voltage. If they are equal, there is no need to adjust the power of the first branch or the power of the second branch; if they are not equal, the power of the first branch or the power of the second branch is adjusted through a boost circuit.

[0102] If the voltage difference is 0, it is determined that the MPPT circuit is not in a voltage difference state; further, it is determined whether the current difference is 0; if the current difference is not 0, the power of the first branch or the power of the second branch is adjusted through the boost circuit; if the current difference is 0, there is no need to adjust the power of the first branch or the power of the second branch.

[0103] Please see Figure 3 , Figure 3 This is a schematic diagram of the MPPT circuit provided in an embodiment of the present invention. Figure 3 As shown, the MPPT circuit provided in this embodiment of the invention includes a first branch 210, a second branch 220, a first boost circuit 230, a second boost circuit 240, and a controller 250;

[0104] The output terminal of the first branch 210 is electrically connected to the input terminal of the first boost circuit 230, the control terminal of the first branch 210 is communicatively connected to the controller 250, and the control terminal of the first boost circuit 230 is communicatively connected to the controller 250.

[0105] The output terminal of the second branch 220 is electrically connected to the input terminal of the second boost circuit 240, the control terminal of the second branch 220 is communicatively connected to the controller 250, and the control terminal of the second boost circuit 240 is communicatively connected to the controller 250.

[0106] The controller 250 is used for:

[0107] Real-time detection of the first voltage and first current input to the first branch 210, and the second voltage and second current input to the second branch 220;

[0108] The operating state of the MPPT circuit is determined based on the first voltage and the second voltage.

[0109] When the MPPT circuit is in a differential voltage state, the power of the target branch is adjusted by the first boost circuit 230 or the second boost circuit 240 according to the power difference between the first branch 210 and the second branch 220, so that the power of the target branch is the same as the power of the other branch in the MPPT circuit except for the target branch.

[0110] The power difference is determined based on the first voltage, the first current, the second voltage, and the second current, and the target branch is the branch with lower power in the first branch 210 and the second branch 220.

[0111] like Figure 3 As shown, Figure 3 The provided MPPT circuit includes a first branch 210, a second branch 220, a first boost circuit 230, a second boost circuit 240, and a controller 250. The output terminal of the first branch 210 is electrically connected to the input terminal of the first boost circuit 230, and the control terminal of the first branch 210 is communicatively connected to the controller 250. The control terminal of the first boost circuit 230 is also communicatively connected to the controller 250. The output terminal of the second branch 220 is electrically connected to the input terminal of the second boost circuit 240, and the control terminal of the second branch 220 is communicatively connected to the controller 250. The control terminal of the second boost circuit 240 is also communicatively connected to the controller 250.

[0112] The controller 250 is configured to implement the MPPT circuit control method described above. Therefore, the MPPT circuit has all the beneficial effects described in the above embodiments, which will not be repeated here.

[0113] Furthermore, the software implementation methods of this MMPT circuit include, but are not limited to, constant voltage tracking method, disturbance observation method, incremental conductance method, and intelligent control algorithm.

[0114] Furthermore, the design carrier for this MMPT circuit can be a printed circuit board or other materials.

[0115] Optionally, the MPPT circuit also includes a resistor R;

[0116] The first end of resistor R is electrically connected to the first boost circuit 230, and the second end of resistor R is electrically connected to the second boost circuit 240.

[0117] In this embodiment, the MPPT circuit also includes a resistor R disposed between the first boost circuit 230 and the second boost circuit 240, which provides overload protection for the first boost circuit 230 and the second boost circuit 240.

[0118] Furthermore, the present invention also protects an energy storage device configured to implement the MPPT circuit control method of any of the above embodiments, or the energy storage device including the MPPT circuit of any of the above embodiments. Accordingly, since the energy storage device of this embodiment adopts the technical solutions of the above-described MPPT circuit control method and MPPT circuit, the energy storage device possesses all the beneficial effects described in the above embodiments.

[0119] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0120] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0121] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An MPPT circuit control method, characterized in that, Applied to an MPPT circuit, the MPPT circuit includes a first branch, a second branch, a first boost circuit, a second boost circuit, and a controller. The method is applied to the controller and includes: Real-time detection of the first voltage and first current input to the first branch, and the second voltage and second current input to the second branch; The operating state of the MPPT circuit is determined based on the first voltage and the second voltage. When the MPPT circuit is in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the power difference between the first branch and the second branch, so that the power of the target branch is the same as the power of the other branch in the MPPT circuit excluding the target branch. The power difference is determined based on the first voltage, the first current, the second voltage, and the second current, and the target branch is the branch with lower power between the first branch and the second branch. Based on the power difference between the first branch and the second branch, the power of the target branch is adjusted via a first boost circuit or a second boost circuit, including: Calculate the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch; When the power difference is not equal to the first power or the second power, the power of the target branch is adjusted by the first boost circuit or the second boost circuit. Calculate the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch, including: The ratio between the current difference and the voltage difference is determined as the power difference between the first branch and the second branch; the current difference is the absolute value of the difference between the first current and the second current, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage. The ratio between the first current and the first voltage is defined as the first power; The ratio between the second current and the second voltage is defined as the second power.

2. The method according to claim 1, characterized in that, The operating state of the MPPT circuit is determined based on the first voltage and the second voltage, including: The absolute value of the difference between the first voltage and the second voltage is defined as the voltage difference. If the voltage difference is not equal to 0, or the voltage difference is greater than a preset threshold, the MPPT circuit is determined to be in a voltage difference state; the preset threshold is a positive integer greater than 0. If the voltage difference is equal to 0, or if the voltage difference is less than or equal to a preset threshold, the MPPT circuit is determined to be not in a voltage difference state.

3. The method according to claim 1, characterized in that, Adjusting the power of the target branch via a first boost circuit or a second boost circuit includes: The voltage of the target branch is increased by the first or second boost circuit so that the voltage of the target branch is the sum of the initial voltage and the voltage difference, where the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

4. The method according to claim 1, characterized in that, After determining the operating state of the MPPT circuit based on the first and second voltages, the method further includes: When the MPPT circuit is not in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the current difference. The current difference is the absolute value of the difference between the first current and the second current.

5. The method according to claim 4, characterized in that, Based on the current difference, the power of the target branch is adjusted via a first boost circuit or a second boost circuit, including: When the current difference is not equal to 0, the voltage of the target branch is increased by the first boost circuit or the second boost circuit so that the voltage of the target branch is the sum of the initial voltage and the voltage difference, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage.

6. An MPPT circuit, characterized in that, It includes a first branch, a second branch, a first boost circuit, a second boost circuit, and a controller; The output terminal of the first branch is electrically connected to the input terminal of the first boost circuit, the control terminal of the first branch is communicatively connected to the controller, and the control terminal of the first boost circuit is communicatively connected to the controller. The output terminal of the second branch is electrically connected to the input terminal of the second boost circuit, the control terminal of the second branch is communicatively connected to the controller, and the control terminal of the second boost circuit is communicatively connected to the controller. The controller is used for: Real-time detection of the first voltage and first current input to the first branch, and the second voltage and second current input to the second branch; The operating state of the MPPT circuit is determined based on the first voltage and the second voltage. When the MPPT circuit is in a differential voltage state, the power of the target branch is adjusted by the first boost circuit or the second boost circuit according to the power difference between the first branch and the second branch, so that the power of the target branch is the same as the power of the other branch in the MPPT circuit excluding the target branch. The power difference is determined based on the first voltage, the first current, the second voltage, and the second current, and the target branch is the branch with lower power between the first branch and the second branch. The controller is also used for: Calculate the power difference between the first branch and the second branch, the first power of the first branch, and the second power of the second branch; When the power difference is not equal to the first power or the second power, the power of the target branch is adjusted by the first boost circuit or the second boost circuit; and The ratio between the current difference and the voltage difference is determined as the power difference between the first branch and the second branch; the current difference is the absolute value of the difference between the first current and the second current, and the voltage difference is the absolute value of the difference between the first voltage and the second voltage. The ratio between the first current and the first voltage is defined as the first power; The ratio between the second current and the second voltage is defined as the second power.

7. The MPPT circuit according to claim 6, characterized in that, The MPPT circuit also includes resistors; The first end of the resistor is electrically connected to the first boost circuit, and the second end of the resistor is electrically connected to the second boost circuit.

8. An energy storage device, characterized in that, The energy storage device is configured to implement the MPPT circuit control method as described in any one of claims 1-5, or the energy storage device includes the MPPT circuit as described in claim 6 or 7.

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