Solar cell power manager

Abstract

A solar cell power manager comprises a boost-buck circuit, a temperature acquisition unit, a processing unit, an input detection unit and an output detection unit. The processing unit calculates a reference maximum power at a reference temperature by a fixed voltage method or a perturbation and observation method according to first voltage and current information and second voltage and current information, then calculates a corrected maximum power according to a formula and an actual temperature, and calculates a corrected maximum power at the actual temperature according to the corrected maximum power. And controlling the step-up and step-down circuit to change an output voltage at an output end so as to change a solar cell voltage at an input end, so that a solar cell array works at the corrected maximum power. Therefore, the calculation of the correction maximum power introduces the actual temperature of the solar cell array, and the accuracy of the correction maximum power is improved.

Description

Technical Field

[0001] The present invention relates to a power manager, and more particularly to a power manager for a solar cell (solar panel). Background Art

[0002] Generally, traditional solar cell controllers detect changes in voltage and current and directly calculate the optimized power under a mathematical formula model.

[0003] Taking voltage detection as an example, specifically, a pure hardware power tracking control system for a solar panel provided by Chinese Patent Publication No. CN113725989A includes a control circuit and a charging management control circuit; the input end of the control circuit is respectively connected to the solar panel and the adapter, the output end of the control circuit is connected to the control end of the charging management control circuit, and the output end of the charging management control circuit is connected to the battery to be charged.

[0004] The aforementioned patent case tracks according to the voltage value corresponding to the maximum power of the solar panel, and the tracking signal is used to control the subsequent PWM chip to adjust the duty cycle of the power device of the chip, so that the solar panel can stably charge the charging battery with the maximum power, and the output stability of the control circuit is improved.

[0005] However, this method of directly calculating the optimized power under a mathematical formula model based on the changes in voltage and current usually calculates in a state of 25°C without considering the temperature change of the solar cell. Summary of the Invention

[0006] To solve the above problems, the present inventor proposes a solar cell power manager for connecting a solar cell array and a load. The solar cell power manager includes: a buck-boost circuit having an opposite input end and an output end, the input end being electrically connected to the solar cell array, and the output end being electrically connected to the load; a temperature acquisition unit electrically connected to the solar cell array; a processing unit signal-connected to the buck-boost circuit and the temperature acquisition unit, the temperature acquisition unit obtaining an actual temperature of the solar cell array and transmitting it to the processing unit; an input detection unit electrically connected to the input end and signal-connected to the processing unit, the input detection unit obtaining a first voltage-current information at the input end and transmitting it to the processing unit; and an output detection unit electrically connected to the output end and signal-connected to the processing unit, the output detection unit obtaining a second voltage-current information at the output end and transmitting it to the processing unit; the processing unit calculates a reference maximum power at a reference temperature by a fixed voltage method or a perturbation and observation method according to the first voltage-current information and the second voltage-current information; the processing unit then calculates a corrected maximum power according to a formula, and controls the buck-boost circuit to change an output voltage at the output end according to the corrected maximum power, thereby changing a solar cell voltage at the input end, so that the solar cell array operates at the corrected maximum power; the formula is Pmax(T) = Pmax(Tref) × [1 + α(T - Tref)], where Pmax(T) is the corrected maximum power, Pmax(Tref) is the reference maximum power, α is a temperature coefficient, T is the actual temperature, and Tref is the reference temperature.

[0007] Further, the processing unit includes an artificial intelligence module, and the first voltage-current information includes the solar cell voltage and a solar cell current; after the processing unit obtains the solar cell voltage and the solar cell current, the trained artificial intelligence module compares a solar cell current-voltage relationship curve formed by the solar cell voltage and the solar cell current with a standard current-voltage relationship curve; when the solar cell current-voltage relationship curve does not coincide with the standard current-voltage relationship curve, the artificial intelligence module obtains an analysis result according to the difference between the solar cell current-voltage relationship curve and the standard current-voltage relationship curve.

[0008] Further, there is a communication unit signal-connected to the processing unit and a main control system; after the artificial intelligence module obtains the analysis result, the processing unit issues an abnormal prompt to the main control system via the communication unit.

[0009] Further, when the corrected maximum power and / or the reference maximum power is not greater than a minimum operating power of the processing unit, the processing unit stops controlling the buck-boost circuit.

[0010] Furthermore, the solar cell array includes several solar cells, and the solar cells form at least one series circuit electrically connected to the buck-boost circuit; when one of the solar cells is abnormal, the processing unit controls the remaining solar cells other than the one solar cell to maintain the series circuit.

[0011] Furthermore, the buck-boost circuit includes a DC-DC buck circuit and a DC-DC boost circuit electrically connected to each other. The first voltage-current information includes the solar cell voltage and a solar cell open-circuit voltage, and the second voltage-current information includes the output voltage; in the fixed voltage method: when the output voltage is greater than a preset voltage, the processing unit controls the buck-boost circuit to stop output; when the output voltage is not greater than the preset voltage, the processing unit controls the DC-DC boost circuit to increase the output voltage. If the solar cell voltage is not equal to a solar cell reference voltage and the solar cell voltage is greater than the output voltage, the processing unit controls the DC-DC buck circuit to decrease the output voltage. If the solar cell voltage is not equal to the solar cell reference voltage and the solar cell voltage is not greater than the output voltage, the processing unit controls the DC-DC boost circuit to increase the output voltage. If the solar cell voltage is equal to the solar cell reference voltage, the processing unit stops controlling the buck-boost circuit and takes a solar cell power corresponding to the solar cell voltage as the reference maximum power; the solar cell reference voltage is a constant multiple of the solar cell open-circuit voltage.

[0012] Furthermore, the buck-boost circuit includes a DC-DC buck circuit and a DC-DC boost circuit electrically connected to each other. The first voltage-current information includes the solar cell voltage and a solar cell current, and the second voltage-current information includes the output voltage; in the perturbation and observation method: the processing unit obtains a solar cell power according to the solar cell voltage and the solar cell current, and the processing unit further forms a solar cell power-voltage relationship curve according to the solar cell voltage and the solar cell power; when the slope of the solar cell power-voltage relationship curve is greater than 0 at the solar cell voltage, the processing unit controls the DC-DC boost circuit to increase the output voltage, thereby increasing the solar cell voltage; when the slope of the solar cell power-voltage relationship curve is less than 0 at the solar cell voltage, the processing unit controls the DC-DC buck circuit to decrease the output voltage, thereby decreasing the solar cell voltage; when the slope of the solar cell power-voltage relationship curve is equal to 0 at the solar cell voltage, the processing unit takes the solar cell power corresponding to the solar cell voltage as the reference maximum power.

[0013] Furthermore, there are several processing units connected in parallel with each other; when one of the processing units malfunctions, the remaining processing units continue to calculate the reference maximum power and the corrected maximum power.

[0014] Furthermore, there is a heating element connected to the temperature acquisition unit, there is a heat dissipation layer in contact with the heating element, and there is a gap between the heating element and the processing unit.

[0015] Wherein, the temperature acquisition unit is a thermocouple wire.

[0016] According to the above technical features, the following effects can preferably be achieved: 1. The calculation of the corrected maximum power introduces the actual temperature of the solar cell array, increasing the accuracy of the corrected maximum power.

[0017] 2. Boost or buck through the buck-boost circuit to achieve the best gain output effect of the solar cell array.

[0018] 3. When the corrected maximum power and / or the reference maximum power is not greater than the minimum operating power of the processing unit, the processing unit stops controlling the buck-boost circuit, increasing the power generation efficiency in the morning, evening or on cloudy days.

[0019] 4. In the case of multiple solar cells, once one of the solar cells malfunctions, the processing unit can control the remaining normal solar cells to maintain the series circuit, ensuring the normal power supply of the solar cell array.

[0020] 5. In the case of multiple processing units, once one of the processing units malfunctions, the normal processing units can continue to maintain the calculation of the reference maximum power and the corrected maximum power, ensuring the normal power supply of the solar cell array.

[0021] 6. The artificial intelligence module obtains the analysis result through the difference between the solar cell current-voltage relationship curve and the standard current-voltage relationship curve, can preliminarily determine whether the solar cell array is normal, and assist the maintenance personnel to find the abnormal place.

[0022] 7. When an abnormality exists, the processing unit will report back to the main control system through the communication unit, facilitating the management personnel or the maintenance personnel to master the situation and perform timely maintenance.

[0023] 8. There is a gap between the heating element and the processing unit, effectively isolating the high temperature generated by the heating element and preventing the heating element from contacting the processing unit and affecting the service life of the processing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a system block diagram of an embodiment of the present invention.

[0025] Figure 2 It is a flow block diagram of an embodiment of the present invention.

[0026] Figure 2A Schematic diagram of the separation between the processing unit and the heating element according to an embodiment of the present invention.

[0027] Figure 3 Schematic illustration of an embodiment of the present invention Figure 1 , showing the current-voltage relationship curve of a solar cell that does not coincide with the standard current-voltage relationship curve.

[0028] Figure 4 Schematic illustration of an embodiment of the present invention Figure 2 , showing the current-voltage relationship curve of a solar cell that does not coincide with the standard current-voltage relationship curve.

[0029] Figure 5 Schematic illustration of an embodiment of the present invention Figure 3 , showing the current-voltage relationship curve of a solar cell that does not coincide with the standard current-voltage relationship curve.

[0030] Figure 6 Schematic illustration of an embodiment of the present invention Figure 4 , showing the current-voltage relationship curve of a solar cell that does not coincide with the standard current-voltage relationship curve.

[0031] Figure 7 Schematic illustration of an embodiment of the present invention Figure 5 , showing the current-voltage relationship curve of a solar cell that does not coincide with the standard current-voltage relationship curve.

[0032] Figure 8 Schematic illustration of an embodiment of the present invention Figure 6 , showing the current-voltage relationship curve of a solar cell that does not coincide with the standard current-voltage relationship curve.

[0033] In the figure: 1: Buck-boost circuit; 11: Input terminal; 12: Output terminal; 13: DC-DC buck circuit; 14: DC-DC boost circuit; 2: Temperature acquisition unit; 3: Processing unit; 31: Artificial intelligence module; 4: Input detection unit; 5: Output detection unit; 6: Communication unit; 7: Heating element; 8: Heat dissipation layer; A: Solar cell array; B: Load; C: Main control system. Detailed implementation manners

[0034] Combining the above technical features, the main functions of the solar cell power manager of the present invention will be clearly presented in the following embodiments.

[0035] Please refer to Figure 1 and Figure 2 , to disclose a solar cell power manager according to an embodiment of the present invention, comprising: A buck-boost circuit 1 has a relative input terminal 11 and an output terminal 12. The input terminal 11 is electrically connected to a solar cell array A, and the output terminal 12 is electrically connected to a load B.

[0036] More specifically, the buck-boost circuit 1 includes a DC-DC buck circuit 13 and a DC-DC boost circuit 14 that are electrically connected to each other. In a preferred embodiment of the present invention, the DC-DC buck circuit 13 is electrically connected to the solar cell array A through the input terminal 11, and the DC-DC boost circuit 14 is electrically connected to the load B through the output terminal 12.

[0037] The solar cell array A may include a plurality of solar cells. Every several solar cells are connected in series to form a series loop, and multiple series loops are then connected in parallel with each other and electrically connected to the buck-boost circuit 1 in an array manner.

[0038] A temperature acquisition unit 2 is electrically connected to the solar cell array A. Preferably, the temperature acquisition unit 2 is a thermocouple.

[0039] A processing unit 3 is signal-connected to the buck-boost circuit 1 and the temperature acquisition unit 2. The temperature acquisition unit 2 obtains an actual temperature on the surface of the solar cell array A and transmits it to the processing unit 3.

[0040] An input detection unit 4 is electrically connected to the input terminal 11 and signal-connected to the processing unit 3. The input detection unit 4 obtains a first voltage and current information at the input terminal 11 and transmits it to the processing unit 3.

[0041] An output detection unit 5 is electrically connected to the output terminal 12 and signal-connected to the processing unit 3. The output detection unit 5 obtains a second voltage and current information at the output terminal 12 and transmits it to the processing unit 3.

[0042] A communication unit 6 is signal-connected to the processing unit 3 and a main control system C, such as the backend control system of a factory, the monitoring system of a maintenance company for the solar cell array A, etc. The communication method adopted by the communication unit 6 may be, for example, 4G, 3G, General Packet Radio Service (GPRS), etc., which are not limited in the present invention.

[0043] Specifically, the first voltage and current information may include a solar cell voltage, a solar cell current of the solar cell array A at the input terminal 11, and even a solar cell open-circuit voltage when open-circuited. The second voltage and current information may include an output voltage of the buck-boost circuit 1 at the output terminal 12.

[0044] The processing unit 3 further includes an artificial intelligence module 31. The artificial intelligence module 31 can perform deep learning in advance based on current-voltage diagrams under different abnormal states, such as current-voltage diagrams in overheating states, current-voltage diagrams at different aging stages of the solar cell, etc., to learn what kind of abnormal state can be deduced from the current-voltage diagram. The deep learning technology of the artificial intelligence module 31 is already a known technology and will not be elaborated here.

[0045] Please refer to Figure 1 、 Figure 2 and Figure 2A , during actual implementation, a heating element 7 can be connected to the temperature acquisition unit 2, a heat dissipation layer 8 contacts the heating element 7, and there is a gap between the heating element 7 and the processing unit 3.

[0046] The heating element 7 may be independent or a metal oxide semiconductor field effect transistor or a Schottky diode, etc. inside the solar cell array A, and the heat dissipation layer 8 can be aluminum, etc. Since there is this gap between the heating element 7 and the processing unit 3, the high temperature generated by the heating element 7 is effectively isolated, preventing the heating element 7 from contacting the processing unit 3 and affecting the service life of the processing unit 3.

[0047] When implementing the solar cell power manager, first, the processing unit 3 calculates a reference maximum power at a reference temperature, such as the reference maximum power at 25 °C, according to the first voltage-current information and the second voltage-current information by a fixed voltage method or a perturbation and observation method. Since the heat generation is proportional to the square of the current and proportional to the resistance value, and its physical relationship is constant. The maximum power point tracking (MPPT) of the maximum power tracking is related to the ambient temperature, illuminance, and photovoltaic array. In this embodiment, taking the standard 25 °C and the current change as being proportional (constant) as the standard, with the maximum power point tracking (MPPT) operation varying, so that the operation variation does not deviate too much from the constant curve, and immediately correcting the parameters to 70 °C as the maximum calculation correction range. The solar panel absorbs visible light of the sun's wavelength to convert it into electricity, and the infrared thermal rays of its higher wavelength still exist. When converting visible light into electricity, the movement of the current will also convert a part into temperature. Therefore, when tracking the maximum power, temperature is a very important parameter.

[0048] Please refer to Figures 1 to 3 , for the fixed voltage method, the processing unit 3 first samples the solar cell voltage and the output voltage, and determines whether the output voltage is greater than a preset voltage, such as 55 volts.

[0049] If the output voltage is greater than 55 volts, the processing unit 3 executes an output overvoltage protection program and controls the DC-DC buck circuit 13 and the DC-DC boost circuit 14 to turn off.

[0050] If the output voltage is not greater than 55 volts, the processing unit 3 samples the open-circuit voltage of the solar cell at regular intervals (such as every 10 seconds), and uses 0.78 times the open-circuit voltage of the solar cell as a solar cell reference voltage.

[0051] Next, the processing unit 3 controls the DC-DC boost circuit 14 to increase the output voltage and samples the solar cell voltage.

[0052] If the solar cell voltage is not equal to the solar cell reference voltage and the solar cell voltage is greater than the output voltage, the processing unit 3 starts a buck program and controls the DC-DC buck circuit 13 to reduce the output voltage to complete the startup of the solar cell.

[0053] If the solar cell voltage is not equal to the solar cell reference voltage and the solar cell voltage is not greater than the output voltage, the processing unit 3 starts a boost program and controls the DC-DC boost circuit 14 to increase the output voltage to complete the startup of the solar cell.

[0054] If the solar cell voltage is equal to the solar cell reference voltage, that is, the startup of the solar cell is completed, the processing unit 3 stops controlling the buck-boost circuit 1.

[0055] In actual implementation, after the startup of the solar cell, the processing unit 3 can still continue to sample the solar cell voltage and the output voltage at regular or irregular intervals to ensure that the solar cell array A and the solar cell power manager both maintain normal operation.

[0056] Since the solar cell voltage and the solar cell current are known, the processing unit 3 can take the product of the two as a solar cell power, and take the solar cell power corresponding to the solar cell voltage as the reference maximum power.

[0057] In terms of the perturbation observation method, the processing unit 3 can obtain the solar cell power based on the solar cell voltage and the solar cell current, and the processing unit 3 forms a solar cell power-voltage relationship curve based on the solar cell voltage and the solar cell power.

[0058] When at the solar cell voltage, if the slope of the solar cell power-voltage relationship curve is greater than 0, it means that the current solar cell voltage is to the left of the maximum power point. The processing unit 3 controls the DC-DC boost circuit 14 to increase the output voltage, thereby increasing the solar cell voltage.

[0059] When the slope of the power-voltage relationship curve of the solar cell is less than 0 at this solar cell voltage, it means that the solar cell voltage at this time is on the right side of the maximum power point. The processing unit 3 controls the DC-DC buck circuit 13 to reduce the output voltage, thereby reducing the solar cell voltage.

[0060] When the slope of the power-voltage relationship curve of the solar cell is equal to 0 at this solar cell voltage, it means that the solar cell voltage reaches the maximum power point at this time. The processing unit 3 takes the solar cell power corresponding to this solar cell voltage as the reference maximum power.

[0061] After calculating the reference maximum power by the fixed voltage method or the perturbation and observation method, the processing unit 3 then calculates a corrected maximum power according to a formula, and controls the buck-boost circuit 1 to change the output voltage at the output terminal 12 according to the corrected maximum power.

[0062] The formula is Pmax(T) = Pmax(Tref) × [1 + α(T - Tref)], where Pmax(T) is the corrected maximum power, Pmax(Tref) is the reference maximum power, α is a temperature coefficient, T is the actual temperature, and Tref is the reference temperature.

[0063] It should be added that when the processing unit 3 controls the buck-boost circuit 1 to change the output voltage at the output terminal 12, since the load B of the DC system is generally a resistive load, sometimes it may be in the form of a resistor in series with a battery.

[0064] This makes the load current and the load voltage closely positively correlated, and the solar cell power manager adopts the DC-DC buck circuit 13 and the DC-DC boost circuit 14 with relatively high conversion efficiency. Therefore, by controlling the output voltage, the output power can be changed, and at the same time, the solar cell voltage on the A side of the solar cell array is also changed, that is, the output power gain of the solar cell array A is changed, and the solar cell array A can also operate at the corrected maximum power.

[0065] Please refer to Figure 1 and please match with Figures 3 to 8 In addition to calculating the corrected maximum power, when the processing unit 3 obtains the solar cell voltage and the solar cell current, the trained artificial intelligence module 31 will compare a solar cell current-voltage relationship curve formed by the solar cell voltage and the solar cell current with a standard current-voltage relationship curve. The standard current-voltage relationship curve is, for example, the current-voltage relationship curve measured when all the said solar cells are in a brand-new state.

[0066] When the current-voltage relationship curve of the solar cell does not coincide with the standard current-voltage relationship curve, the artificial intelligence module 31 obtains an analysis result based on the difference between the current-voltage relationship curve of the solar cell and the standard current-voltage relationship curve.

[0067] After the artificial intelligence module 31 obtains the analysis result, the processing unit 3 sends an abnormality prompt to the main control system C via the communication unit 6, which is convenient for management personnel or maintenance personnel to grasp the situation and perform timely maintenance.

[0068] To illustrate the analysis result in more detail, taking Figure 3 as an example, from the multi-step curve, the artificial intelligence module 31 can judge that it may be caused by the short circuit or damage of the diodes of the solar cell array A, or due to shading, damage of some of the solar cells, or low packaging power, etc.

[0069] Taking Figure 4 as an example, from the curve with a small current, the artificial intelligence module 31 can judge that it may be due to reasons such as attenuation of the solar cell module, large and rapid changes in light intensity, etc.

[0070] Taking Figure 5 as an example, from the curve with an excessively low open-circuit voltage, the artificial intelligence module 31 can judge that it may be due to reasons such as hot spot effect (overheating), diode damage, potential induced degradation effect (PID), etc.

[0071] Taking Figures 6 to 8 as an example, from the curve where both the open-circuit voltage and the short-circuit current are normal, the artificial intelligence module 31 can judge that it may be due to reasons such as aging of the solar cell module, excessive resistance, etc.

[0072] From the current-voltage relationship curve of the solar cell, it is possible to preliminarily determine whether the solar cell array A is normal, and the analysis result can also assist maintenance personnel in finding the abnormality.

[0073] In actual implementation, there can be several processing units 3 connected in parallel with each other. For example, multiple standby processing units 3 are connected in parallel with each other, and an ineffective conduction function is added.

[0074] When one of the processing units 3 malfunctions, the remaining processing units 3 continue to calculate the reference maximum power and the corrected maximum power. Alternatively, when one of the solar cells malfunctions, the processing unit 3 also controls the remaining solar cells other than the malfunctioning solar cell to maintain the series circuit. In actual implementation, switch elements such as relays can be used to separately control whether each processing unit 3 and the solar cell are conducting. In this way, it is possible to prevent the entire series circuit from failing due to the damage of a single (or a small number of) components, ensure normal power supply of the solar cell array A, and avoid power generation interruption during the window period between damage and repair.

[0075] In the early morning, evening, cloudy days and other conditions, when the corrected maximum power and / or the reference maximum power is not greater than a minimum operating power of the processing unit 3, the processing unit 3 stops controlling the buck-boost circuit 1 to increase the power generation efficiency in the early morning, evening or cloudy days.

[0076] Please refer back to Figure 1 , the calculation of the corrected maximum power introduces the actual temperature of the solar cell array A to increase the accuracy of the corrected maximum power, and is combined with the buck-boost circuit 1 for boosting or bucking to achieve the best gain output effect of the solar cell array A.

[0077] Taking the case of high air pollution as an example, the illuminance on the solar cell array A is poor, but the ambient temperature is very high. By introducing the actual temperature, the corrected maximum power can be calculated more accurately.

[0078] The above-described embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A solar cell power manager for connecting a solar cell array and a load, characterized in that, The solar cell power manager includes: A buck-boost circuit having an opposite input terminal and an output terminal, the input terminal being electrically connected to the solar cell array, and the output terminal being electrically connected to the load; A temperature acquisition unit electrically connected to the solar cell array; A processing unit signal-connected to the buck-boost circuit and the temperature acquisition unit, the temperature acquisition unit obtaining an actual temperature of the solar cell array and transmitting it to the processing unit; An input detection unit electrically connected to the input terminal and signal-connected to the processing unit, the input detection unit obtaining a first voltage-current information at the input terminal and transmitting it to the processing unit; And An output detection unit electrically connected to the output terminal and signal-connected to the processing unit, the output detection unit obtaining a second voltage-current information at the output terminal and transmitting it to the processing unit; The processing unit calculates a reference maximum power at a reference temperature by a fixed voltage method or a perturbation and observation method according to the first voltage-current information and the second voltage-current information; The processing unit further calculates a corrected maximum power according to a formula, and controls the buck-boost circuit to change an output voltage at the output terminal according to the corrected maximum power, thereby changing a solar cell voltage at the input terminal, so that the solar cell array operates at the corrected maximum power; The formula is Pmax(T) = Pmax(Tref) × [1 + α(T - Tref)], where Pmax(T) is the corrected maximum power, Pmax(Tref) is the reference maximum power, α is a temperature coefficient, T is the actual temperature, and Tref is the reference temperature.

2. The solar cell power supply manager according to claim 1, wherein Further, the processing unit includes an artificial intelligence module, and the first voltage-current information includes the solar cell voltage and a solar cell current; after obtaining the solar cell voltage and the solar cell current, the trained artificial intelligence module compares a solar cell current-voltage relationship curve formed by the solar cell voltage and the solar cell current with a standard current-voltage relationship curve; when the solar cell current-voltage relationship curve does not coincide with the standard current-voltage relationship curve, the artificial intelligence module obtains an analysis result according to the difference between the solar cell current-voltage relationship curve and the standard current-voltage relationship curve.

3. The solar cell power supply manager according to claim 1, characterized in that, Further, there is a communication unit signal-connected to the processing unit and a main control system; after the artificial intelligence module obtains the analysis result, the processing unit issues an abnormality prompt to the main control system via the communication unit.

4. The solar cell power manager according to claim 1, characterized in that, Further, when the corrected maximum power and / or the reference maximum power is not greater than a minimum operating power of the processing unit, the processing unit stops controlling the buck-boost circuit.

5. The solar cell power supply manager according to claim 1, wherein, Further, the solar cell array includes several solar cells, and the solar cells form at least one series circuit electrically connected to the buck-boost circuit; when one of the solar cells is abnormal, the processing unit controls the remaining solar cells other than the one solar cell to maintain the series circuit.

6. The solar cell power manager according to claim 1, wherein, Further, the buck-boost circuit includes a DC-DC buck circuit and a DC-DC boost circuit that are electrically connected to each other. The first voltage-current information includes the solar cell voltage and a solar cell open-circuit voltage. The second voltage-current information includes the output voltage. In the fixed voltage method: when the output voltage is greater than a preset voltage, the processing unit controls the buck-boost circuit to stop output; when the output voltage is not greater than the preset voltage, the processing unit controls the DC-DC boost circuit to increase the output voltage. If the solar cell voltage is not equal to a solar cell reference voltage and the solar cell voltage is greater than the output voltage, the processing unit controls the DC-DC buck circuit to decrease the output voltage. If the solar cell voltage is not equal to the solar cell reference voltage and the solar cell voltage is not greater than the output voltage, the processing unit controls the DC-DC boost circuit to increase the output voltage. If the solar cell voltage is equal to the solar cell reference voltage, the processing unit stops controlling the buck-boost circuit and uses a solar cell power corresponding to the solar cell voltage as the reference maximum power. The solar cell reference voltage is a constant multiple of the solar cell open-circuit voltage.

7. The solar cell power manager according to claim 1, characterized in that, Further, the buck-boost circuit includes a DC-DC buck circuit and a DC-DC boost circuit that are electrically connected to each other. The first voltage-current information includes the solar cell voltage and a solar cell current. The second voltage-current information includes the output voltage. In the perturbation and observation method: the processing unit obtains a solar cell power based on the solar cell voltage and the solar cell current, and the processing unit forms a solar cell power-voltage relationship curve based on the solar cell voltage and the solar cell power. When the slope of the solar cell power-voltage relationship curve is greater than 0 at the solar cell voltage, the processing unit controls the DC-DC boost circuit to increase the output voltage, thereby increasing the solar cell voltage. When the slope of the solar cell power-voltage relationship curve is less than 0 at the solar cell voltage, the processing unit controls the DC-DC buck circuit to decrease the output voltage, thereby decreasing the solar cell voltage. When the slope of the solar cell power-voltage relationship curve is equal to 0 at the solar cell voltage, the processing unit uses the solar cell power corresponding to the solar cell voltage as the reference maximum power.

8. The solar cell power supply manager according to claim 1, characterized in that, Further, there are several processing units connected in parallel to each other. When one of the processing units is abnormal, the remaining processing units continue to calculate the reference maximum power and the corrected maximum power.

9. The solar cell power manager according to claim 1, characterized in that, Further, a heating element is connected to the temperature acquisition unit, a heat dissipation layer contacts the heating element, and there is a gap between the heating element and the processing unit.

10. The solar cell power manager according to claim 1, characterized in that The temperature acquisition unit is a thermocouple wire.

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