Charging control circuit and solar photovoltaic power generation system

Abstract

The utility model provides a charging control circuit and a solar photovoltaic power generation system. The charging control circuit comprises a solar connection interface, a micro-inverse output port, a charging circuit unit, a first bypass switch unit, a second bypass switch unit, a main control chip and a battery connection interface. The solar energy connecting interface is used for being connected with the output end of an external solar panel, the solar energy connecting interface is connected to the input end of the first bypass switch unit and the input end of the charging circuit unit, and the output end of the first bypass switch unit is connected with the micro-inverse output port. According to the scheme, the input from the solar panel to the micro-inverter can be cut off through the first bypass switch unit, and meanwhile, the input from the battery to the micro-inverter can be cut off through the second charging management chip, so that the main control chip controls whether the solar energy is connected to the micro-inverter or not, and the situation that the solar energy is directly connected to the micro-inverter in the prior art is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery charging, in particular to a charging control circuit and a solar photovoltaic power generation system. Background Art

[0002] A solar panel absorbs sunlight and converts solar radiation directly or indirectly into electrical energy through the photoelectric or photochemical effects. Conventional solar panels can generate electricity to power electrical devices outdoors. Alternatively, solar energy can be stored in an energy storage power supply. To conserve energy, solar energy can be stored in an energy storage power supply. This involves connecting the solar panel to a battery to store the generated electricity.

[0003] Solar panel power can also be directly supplied to household electrical circuits. In this case, the solar energy is connected to a microinverter (a device that primarily uses solar panels as input). The microinverter converts the solar power into AC power to power household electrical circuits. Since solar power is generated when there is sunlight, the microinverter is affected by high temperatures when the sunlight is strong, which limits its power, resulting in lower efficiency and lower solar energy utilization. Utility Model Content

[0004] Therefore, it is necessary to provide a charging control circuit and a solar photovoltaic power generation system to solve the problem of low solar energy utilization caused by directly providing solar energy to household power circuits through micro-inverters.

[0005] To achieve the above object, the utility model provides a charging control circuit, including a solar connection interface, a micro-inverter output port, a charging circuit unit, a first bypass switch unit, a second bypass switch unit, a main control chip and a battery connection interface;

[0006] The solar connection interface is used to connect to the output end of an external solar panel. The solar connection interface is connected to the input end of the first bypass switch unit and the input end of the charging circuit unit. The output end of the first bypass switch unit is connected to the micro-inverter output port. The output end of the charging circuit unit is connected to the battery connection interface and the input end of the second bypass switch unit. The output end of the second bypass switch unit is connected to the micro-inverter output port. The control pins of the main control chip respectively control the switching of the first bypass switch unit and the second bypass switch unit. The battery connection interface is used to connect to an external battery, and the micro-inverter output port is used to connect to a micro-inverter.

[0007] Furthermore, the battery connection interface is also used to connect to the power supply terminal of an external inverter controller.

[0008] Furthermore, the charging circuit unit includes a first high-side switch tube, a first low-side switch tube, a second high-side switch tube, and a second low-side switch tube. The control ends of the first high-side switch tube, the first low-side switch tube, the second high-side switch tube, and the second low-side switch tube are respectively connected to different control pins of the main control chip. The positive pole of the solar connection interface is connected to the first high-side switch tube and the first low-side switch tube, and then to the negative pole of the solar connection interface. The positive pole of the battery connection interface is connected to the second high-side switch tube and the second low-side switch tube, and then to the negative pole of the battery connection interface. The middle point where the first high-side switch tube and the first low-side switch tube are connected is connected to the middle point where the second high-side switch tube and the second low-side switch tube are connected through a charging inductor.

[0009] Furthermore, it also includes a high-side and low-side driver chip, and the control pin of the main control chip is connected to the control end of the first high-side switch tube and the first low-side switch tube through the high-side and low-side driver chip, and / or the control pin of the main control chip is connected to the control end of the second high-side switch tube and the second low-side switch tube through the high-side and low-side driver chip.

[0010] Furthermore, the first bypass switch unit includes a first pair of switch tubes, the sources of the first pair of switch tubes are connected to each other, the gates are connected to a control pin of the main control chip, one drain of the first pair of switch tubes is connected to the positive electrode of the solar connection interface, and the other drain of the first pair of switch tubes is connected to the positive electrode of the micro-inverter output port.

[0011] Furthermore, it also includes a first optocoupler, wherein the two ends of the light-emitting diode of the first optocoupler are connected to a control pin of the main control chip through a current-limiting resistor, one end of the output transistor of the first optocoupler is connected to a power supply, and the other end of the output transistor of the first optocoupler is connected to the gate of the first pair of switching tubes.

[0012] Furthermore, the second bypass switch unit includes a second pair of switch tubes, the sources of the second pair of switch tubes are connected to each other, the gates are connected to a control pin of the main control chip, one drain of the second pair of switch tubes is connected to the positive electrode of the battery connection interface, and the other drain of the second pair of switch tubes is connected to the positive electrode of the micro-inverter output port.

[0013] Furthermore, it also includes a second optocoupler, wherein the two ends of the light-emitting diode of the second optocoupler are connected to a control pin of the main control chip through a current-limiting resistor, one end of the output transistor of the second optocoupler is connected to the power supply, and the other end of the output transistor of the second optocoupler is connected to the gate of the second pair of switching tubes.

[0014] The utility model provides a solar photovoltaic power generation system, including a micro-inverter, a solar panel, a solar charging module and a battery module. The solar charging module includes a charging control circuit, and the charging control circuit is a charging control circuit according to any embodiment of the utility model. The solar connection interface of the charging control circuit is connected to the output end of the solar panel, the battery connection interface of the charging control circuit is connected to the battery of the battery module, and the micro-inverter output port of the charging control circuit is connected to the input end of the micro-inverter.

[0015] Furthermore, the solar charging module and the battery module are stacked and connected to each other via a connection interface therebetween, and the electric energy of the battery module is transmitted to the solar charging module via the connection interface of the battery module.

[0016] Different from the existing technology, the above technical solution can directly store solar energy in the battery through the charging circuit unit. The first bypass switch unit can cut off the input from the solar panel to the micro-inverter, and the second charging management chip can cut off the input from the battery to the micro-inverter, so that the main control chip can control whether the solar energy is connected to the micro-inverter, avoiding the existing situation where the solar energy is directly connected to the micro-inverter. Then, when the sun is strong and the household does not need to generate electricity, the charging circuit unit is sampled first, the first bypass switch unit and the second bypass switch unit are disconnected, and the battery is charged and stored to improve the utilization rate of solar energy. After the energy storage is completed, the bypass is performed, and the first bypass switch unit is turned on to pass the solar energy to the micro-inverter for power generation. At night or in cloudy and dark environments, the main control chip turns on the second bypass switch unit according to the user's electricity consumption, and uses the battery to connect to the micro-inverter to generate electricity for the household. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic block diagram of the structure of a charging control circuit according to a disclosed embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the mechanical structure of a disclosed embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the mechanical structure of a solar charging module according to a disclosed embodiment of the present invention;

[0020] Figure 4 This is a circuit diagram of the charging circuit unit of the charging control circuit of the present invention;

[0021] Figure 5 This is a circuit diagram of the first bypass switch unit of the charging control circuit of the present invention;

[0022] Figure 6 This is a circuit diagram of the second bypass switch unit of the charging control circuit of the present invention;

[0023] Figure 7 This is a circuit diagram of the main control chip portion of the charging control circuit of the present utility model;

[0024] Figure 8 This is a top mechanical structure diagram of the solar charging module of the present utility model;

[0025] Figure 9 This is a diagram of the bottom mechanical structure of the solar charging module of the present invention;

[0026] Figure 10 This is a mechanical structure diagram of the battery module of the present invention.

[0027] Description of reference numerals:

[0028] 1. Inverter control module;

[0029] 2. Solar charging module;

[0030] 3. Battery module;

[0031] 21. Solar energy connection interface;

[0032] 22. Micro-inverter output port;

[0033] 16. First bottom interface;

[0034] 27. First top interface;

[0035] 28. Second bottom interface;

[0036] 32. Second top interface;

[0037] 23. First in command;

[0038] 31. Second in command. DETAILED DESCRIPTION

[0039] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0040] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0041] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0042] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three possible relationships exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0043] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0044] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0045] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0046] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0047] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] See also Figures 1 to 10 , this embodiment provides a charging control circuit for use in an energy storage system, such as Figures 1 to 3 As shown, the energy storage system includes an inverter control module 1, a solar charging module 2 and a battery module 3. The charging control circuit of the utility model is in the solar charging module 2. Please refer to the circuit diagram Figures 4 to 7 The charging control circuit includes a solar connection interface 21 (for Figure 5 The P2 interface, Charge1+ and Charge1-, the mechanical structure is as follows Figure 3 Solar connection interface 21 shown), micro-inverter output port 22 (as shown Figure 6 The PCS_IN and GND are shown in the figure. The mechanical structure is as follows: Figure 3 As shown in the micro-inverter output port 22), the charging circuit unit (specific implementation example Figure 4 As shown in the circuit), the first bypass switch unit (as Figure 1 As shown in S1), the second bypass switch unit (as shown in Figure 1 As shown in S3), the main control chip (such as Figure 7 U14) and battery connection interface (as shown Figure 6 As shown in CN1 and CN2, Figure 6 BAT+_IN and AGND in the .

[0049] The solar connection interface is used to connect to the output end of an external solar panel. The solar connection interface is connected to the input end of the first bypass switch unit and the input end of the charging circuit unit. The output end of the first bypass switch unit is connected to the micro-inverter output port. The output end of the charging circuit unit is connected to the battery connection interface and the input end of the second bypass switch unit. The output end of the second bypass switch unit is connected to the micro-inverter output port. The control pins of the main control chip respectively control the switching of the first bypass switch unit and the second bypass switch unit. The battery connection interface is used to connect to an external battery, and the micro-inverter output port is used to connect to a micro-inverter.

[0050] Among them, the negative electrode AGND of the battery connection interface needs to be connected to the GND of the entire circuit, such as Figure 4 The negative pole of the solar cell also needs to be connected to the circuit ground GND, which can be connected together through a zero-ohm resistor, or through a transistor (such as Figure 5 As shown in Q14, the control terminal PV_IN can be connected to the positive terminal of the solar connection interface and then connected together after being turned on by solar energy. The main control chip or other chips (such as optocouplers) also require power. This power can be connected via an external interface or obtained by converting the voltage after the solar connection interface is connected to solar energy. As long as the main control chip or other chips can be powered, it will be sufficient. The charging circuit unit can be a dedicated charging management chip, such as the CN3795, which does not require control from the main control chip. The charging principle is that the charging management chip controls the duty cycle of the switch chip through the drive pin, charging the energy into the inductor. The output of the inductor is then fed back to the feedback pin for charging. During charging, the charging management chip detects the voltage of the current sense resistor through the current sense pin to implement overcurrent protection. The main control chip can be an STC or STM series chip.

[0051] In this embodiment, the solar energy can be directly stored in the battery through the charging circuit unit. The first bypass switch unit can cut off the input from the solar panel to the micro-inverter, and the second charging management chip can cut off the input from the battery to the micro-inverter, so that the main control chip can control whether the solar energy is connected to the micro-inverter, avoiding the existing situation where the solar energy is directly connected to the micro-inverter. Then, when the light is strong and the household does not need to generate electricity, the charging circuit unit is sampled first, the first bypass switch unit and the second bypass switch unit are disconnected, and the battery is charged and stored to improve the utilization rate of solar energy. After the energy storage is completed, the bypass is performed, and the first bypass switch unit is turned on to give the solar energy to the micro-inverter for power generation. At night or in a cloudy and dark environment, the main control chip turns on the second bypass switch unit according to the user's electricity consumption, and uses the battery to connect to the micro-inverter to generate electricity for the household.

[0052] In order to realize the inverter control module 1 using the power of the battery module 3, as shown in FIG. Figure 2 and Figure 6 As shown, the battery connection interface is also used to connect to the power supply end of an external inverter controller (i.e., the inverter controller in the inverter control module). In this way, the inverter controller can convert the electrical energy of the battery module into AC power for external output. Figure 6 As shown, it can include two battery connection interfaces CN1 and CN2, which are internally connected together. CN1 can be connected to the inverter controller of the inverter control module 1, and CN2 can be connected to the battery module, so that the inverter controller can obtain the power of the battery through the battery connection interfaces CN1 and CN2.

[0053] As mentioned above, the charging circuit unit can be implemented with a separate chip, or it can be implemented with a switch tube that is independent and controlled by a programmable control chip. The programmable control chip here can be separate or the main control chip of the present invention. Here, the main control chip is used for explanation. Figure 4 As shown, the charging circuit unit includes a first high-side switch tube Q8, a first low-side switch tube Q11, a second high-side switch tube Q9, and a second low-side switch tube Q10. The control ends of the first high-side switch tube Q8, the first low-side switch tube Q11, the second high-side switch tube Q9, and the second low-side switch tube Q10 are respectively connected to different control pins of the main control chip. The positive electrode Charge1+ of the solar connection interface is connected to the first high-side switch tube Q8 and the first low-side switch tube Q11, and then to the negative electrode of the solar connection interface. The positive electrode of the battery connection interface is connected to the second high-side switch tube Q9 and the second low-side switch tube Q10, and then to the negative electrode of the battery connection interface. The midpoint between the first high-side switch tube Q8 and the first low-side switch tube Q11 is connected to the midpoint between the second high-side switch tube Q9 and the second low-side switch tube Q10 through the charging inductor L1. By controlling the conduction of the first high-side switch Q8, the first low-side switch Q11, the second high-side switch Q9, and the second low-side switch Q10, the solar energy can be charged to the inductor L1 and then to the battery. Figure 4 The BAT+ is connected to the second high-side switch tube Q9 through the switch chip U2 (model can be mt9222wt). When working, when the switch chip U2 is turned on, the positive electrode PCS_IN is turned on to the second high-side switch tube Q9.

[0054] Furthermore, it also includes high-side and low-side driver chips (such as Figure 4 In the embodiment of the present invention, the control pin of the main control chip is connected to the control terminals of the first high-side switch tube and the first low-side switch tube through the high-side and low-side driver chip U3, and / or the control pin of the main control chip is connected to the control terminals of the second high-side switch tube and the second low-side switch tube through the high-side and low-side driver chip U4. The high-side and low-side driver chips can improve the control and driving capabilities of the programmable logic control chip or the main control chip, thereby realizing the driving of the high-side switch tube or the low-side switch tube.

[0055] The bypass switch unit can be implemented by a relay, and in some embodiments, can also be implemented by a switch tube (such as a transistor). When the first bypass switch unit S1 is implemented by a transistor, Figure 5As shown, the first bypass switch unit S1 includes a first pair of switch tubes (Q12 and Q13), the sources of the first pair of switch tubes are connected to each other, and the gates are connected to a control pin of the main control chip after being connected. One drain of the first pair of switch tubes is connected to the positive electrode Charge1+ of the solar connection interface, and the other drain of the first pair of switch tubes is connected to the positive electrode PCS_IN of the micro-inverter output port. It should be noted that Figure 5 PCS_IN is connected to the drain of transistor Q13 via switch chip U5 (model MT9222WT). During operation, when switch chip U5 is turned on, the positive terminal PCS_IN is connected to the drain of transistor Q13. The main control chip can drive the first pair of switches to conduct, allowing power from the solar connection interface to be connected to the micro-inverter output port, realizing the micro-inverter's use of solar energy for power conversion.

[0056] To achieve isolation, Figure 5 As shown, the device further includes a first optocoupler U6. The two ends of the light-emitting diode of the first optocoupler U6 are connected to a control pin of the main control chip via a current-limiting resistor R40. One end of the output transistor of the first optocoupler is connected to a power supply, and the other end of the output transistor of the first optocoupler is connected to the gate of the first pair of switching tubes. In this way, when the control pin of the main control chip is driven, the light-emitting diode inside the first optocoupler emits light, and the transistor inside the first optocoupler is turned on, and the first pair of switching tubes are turned on, thus achieving isolated control.

[0057] The second bypass switch unit S3 can also be implemented by using a transistor, such as Figure 6 As shown, the second bypass switch unit includes a second pair of switching transistors (Q17 and Q18). The sources of the second pair of switching transistors are interconnected, and the gates are connected to a control pin of the main control chip. One drain of the second pair of switching transistors is connected to the positive electrode of the battery connection interface, and the other drain of the second pair of switching transistors is connected to the positive electrode of the micro-inverter output port. The main control chip can drive the second pair of switching transistors to conduct, so that the power of the battery connection interface is connected to the micro-inverter output port, realizing the micro-inverter to use the battery for power conversion.

[0058] To achieve isolation, Figure 6 As shown, a second optocoupler U7 is also included. The two ends of the light-emitting diode of the second optocoupler are connected to a control pin of the main control chip through a current-limiting resistor R47. One end of the output transistor of the second optocoupler is connected to the power supply, and the other end of the output transistor of the second optocoupler is connected to the gate of the second pair of switching tubes. In this way, when the control pin of the main control chip is driven, the light-emitting diode inside the second optocoupler emits light, and the transistor inside the second optocoupler is turned on, and the second pair of switching tubes are turned on, thus achieving isolated control.

[0059] The present invention provides a solar photovoltaic power generation system, comprising a microinverter, a solar panel, a solar charging module 2, and a battery module 3. The solar charging module comprises a charging control circuit, which is a charging control circuit according to any one of the embodiments of the present invention. The solar connection interface of the charging control circuit is connected to the output end of the solar panel, the battery connection interface of the charging control circuit is connected to the battery of the battery module, and the microinverter output port of the charging control circuit is connected to the input end of the microinverter.

[0060] Among them, there can be two solar connection interfaces 21, which are respectively the positive and negative poles of the input. In some embodiments, there can also be one, with a cable with positive and negative poles inside. There can also be two solar connection interfaces 21, which respectively realize two-way solar input. There can be two micro-inverter output ports 22, which are respectively the positive and negative poles of the output. In some embodiments, there can also be one, with a cable with positive and negative poles inside. There can also be two micro-inverter output ports 22, which respectively realize two-way micro-inverter output. In some embodiments, one device can have one solar connection interface (PV input) and one micro-inverter output port (PV output); or one device can have two solar connection interfaces (PV input) and one micro-inverter output port (PV output).

[0061] When the present invention is in use, the solar energy can be directly stored in the battery through the charging circuit unit. The first bypass switch unit can cut off the input from the solar panel to the micro-inverter, while the second charging management chip can cut off the input from the battery to the micro-inverter, so that the main control chip can control whether the solar energy is connected to the micro-inverter, avoiding the existing situation where the solar energy is directly connected to the micro-inverter. Then, when there is strong light and the household does not need to generate electricity, the charging circuit unit is sampled first, the first bypass switch unit and the second bypass switch unit are disconnected, and the battery is charged and stored to improve the utilization rate of solar energy. After the energy storage is completed, the bypass is performed, and the first bypass switch unit is turned on to give the solar energy to the micro-inverter for power generation. At night or in a cloudy and lightless environment, the main control chip turns on the second bypass switch unit according to the user's electricity consumption, and uses the battery to connect to the micro-inverter to generate electricity for the household.

[0062] Furthermore, the solar charging module and the battery module are stacked and connected to each other through a connection interface therebetween, and the electric energy of the battery module is transmitted to the solar charging module through the connection interface of the battery module. Figures 8 to 10As shown. The connection interface includes the first bottom interface 16 of the inverter control module 1, the first top interface 27 of the solar charging module 2, the second bottom interface 28 of the solar charging module 2 and the second top interface 32 of the battery module 3. The top interface and the bottom interface can be connected to each other to achieve stacking. The first bottom interface 16 can also be directly connected to the second bottom interface 28 to achieve direct connection between the inverter control module 1 and the battery module 3. When stacking, as shown in FIG. Figure 2 As shown, stacking and connection are achieved.

[0063] To achieve lifting, handles can be provided on the inverter control module, the solar charging module, and the battery module, respectively. For example, a first handle 23 can be provided on the solar charging module, and a second handle 31 can be provided on the battery module.

[0064] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present utility model. Therefore, based on the innovative concept of the present utility model, changes and modifications to the embodiments described herein, or equivalent structural or process transformations made using the contents of the present utility model specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of protection of the present utility model patent.

Claims

1. A charging control circuit, characterized in that: It includes a solar connection interface, a micro-inverter output port, a charging circuit unit, a first bypass switch unit, a second bypass switch unit, a main control chip and a battery connection interface; The solar connection interface is used to connect to the output end of an external solar panel. The solar connection interface is connected to the input end of the first bypass switch unit and the input end of the charging circuit unit. The output end of the first bypass switch unit is connected to the micro-inverter output port. The output end of the charging circuit unit is connected to the battery connection interface and the input end of the second bypass switch unit. The output end of the second bypass switch unit is connected to the micro-inverter output port. The control pins of the main control chip respectively control the switching of the first bypass switch unit and the second bypass switch unit. The battery connection interface is used to connect to an external battery, and the micro-inverter output port is used to connect to a micro-inverter.

2. A charging control circuit according to claim 1, characterized in that: The battery connection interface is also used to connect to the power supply terminal of an external inverter controller.

3. The charging control circuit according to claim 1, wherein: The charging circuit unit includes a first high-side switch tube, a first low-side switch tube, a second high-side switch tube, and a second low-side switch tube. The control ends of the first high-side switch tube, the first low-side switch tube, the second high-side switch tube, and the second low-side switch tube are respectively connected to different control pins of the main control chip. The positive pole of the solar connection interface is connected to the first high-side switch tube and the first low-side switch tube, and then to the negative pole of the solar connection interface. The positive pole of the battery connection interface is connected to the second high-side switch tube and the second low-side switch tube, and then to the negative pole of the battery connection interface. The middle point where the first high-side switch tube and the first low-side switch tube are connected is connected to the middle point where the second high-side switch tube and the second low-side switch tube are connected through a charging inductor.

4. A charging control circuit according to claim 3, characterized in that: It also includes a high-side and low-side driver chip, and the control pin of the main control chip is connected to the control end of the first high-side switch tube and the first low-side switch tube through the high-side and low-side driver chip, and / or the control pin of the main control chip is connected to the control end of the second high-side switch tube and the second low-side switch tube through the high-side and low-side driver chip.

5. The charging control circuit according to claim 1, wherein: The first bypass switch unit includes a first pair of switch tubes, the sources of the first pair of switch tubes are connected to each other, the gates are connected to a control pin of the main control chip, one drain of the first pair of switch tubes is connected to the positive electrode of the solar connection interface, and the other drain of the first pair of switch tubes is connected to the positive electrode of the micro-inverter output port.

6. A charging control circuit according to claim 5, characterized in that: It also includes a first optocoupler, wherein the two ends of the light-emitting diode of the first optocoupler are connected to a control pin of the main control chip through a current-limiting resistor, one end of the output transistor of the first optocoupler is connected to a power supply, and the other end of the output transistor of the first optocoupler is connected to the gate of the first pair of switching tubes.

7. The charging control circuit according to claim 1, wherein: The second bypass switch unit includes a second pair of switch tubes, the sources of the second pair of switch tubes are connected to each other, the gates are connected to a control pin of the main control chip, one drain of the second pair of switch tubes is connected to the positive electrode of the battery connection interface, and the other drain of the second pair of switch tubes is connected to the positive electrode of the micro-inverter output port.

8. A charging control circuit according to claim 7, characterized in that: It also includes a second optocoupler, wherein the two ends of the light-emitting diode of the second optocoupler are connected to a control pin of the main control chip through a current-limiting resistor, one end of the output transistor of the second optocoupler is connected to a power supply, and the other end of the output transistor of the second optocoupler is connected to the gate of the second pair of switching tubes.

9. A solar photovoltaic power generation system, characterized by: The invention comprises a microinverter, a solar panel, a solar charging module and a battery module. The solar charging module comprises a charging control circuit, and the charging control circuit is any one of claims 1 to 8. The solar connection interface of the charging control circuit is connected to the output end of the solar panel, the battery connection interface of the charging control circuit is connected to the battery of the battery module, and the microinverter output port of the charging control circuit is connected to the input end of the microinverter.

10. A solar photovoltaic power generation system according to claim 9, characterized in that: The solar charging module and the battery module are stacked and connected to each other via a connection interface therebetween, and the electric energy of the battery module is transmitted to the solar charging module via the connection interface of the battery module.

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