Inverter circuit and electronic device

Abstract

An inverter circuit and an electronic device are characterized in that the inverter circuit comprises a DCDC module, the DCDC module is electrically connected with a photovoltaic module, and the DCDC module comprises a first branch and a second branch; the switch module is electrically connected with the DCDC module; one end of the inverter is electrically connected with the switch module, and the other end of the inverter is electrically connected with the DCDC module; when the switch module is in a first control state, the first branch circuit and the second branch circuit are conducted, and the photovoltaic assembly is configured to supply power to the inverter through the first branch circuit and the second branch circuit. According to the utility model, two power switch tubes are added in the switch module, so that a boost mode and a buck mode can work in an optimal state at the same time, and the conversion efficiency of a system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and more specifically to an inverter circuit and an electronic device. Background Art

[0002] High energy prices are an economic burden for many people, and more and more people are turning to renewable energy and investing in their own photovoltaic (PV) systems to generate electricity independently. Since PV modules are susceptible to temperature and light, DC / DC converters are usually required to implement the MPPT function to track the maximum power point of PV modules under different temperatures and different light conditions, thereby increasing power generation and reducing the generation of hot spot effects of PV cells.

[0003] The DC / DC converter adopts a four-switch buck-boost topology structure, which allows the system to adapt to photovoltaic modules of different voltages. At the same time, the energy storage battery can be charged through the DC / DC converter. The access of the energy storage battery can store excess energy in the battery system, achieving peak shaving and valley filling and maximizing the economic benefits of electricity use.

[0004] Compared with the traditional boost circuit or buck circuit, the existing technical solution uses four switches to achieve boost-down conversion control by adding switch tubes to adapt to photovoltaic modules with different voltages. However, the boost working mode and buck working mode of this solution share the main circuit and magnetic devices, so they can only work in one state at any time. Since the output current of the boost working mode is small and the output current of the buck working mode is large under the same power, it makes it difficult to design power semiconductor devices and magnetic devices, and it is difficult to take into account the optimal working state of the two modes, which in turn affects the conversion efficiency of the system. Utility Model Content

[0005] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, an inverter circuit is provided, which includes: a DCDC module, the DCDC module is electrically connected to a photovoltaic component, and the DCDC module includes a first branch and a second branch; a switch module, the switch module is electrically connected to the DCDC module; an inverter, the inverter is electrically connected to the switch module, and the other end of the inverter is electrically connected to the DCDC module; when the switch module is in a first control state, the first branch is connected to the second branch, and the photovoltaic component is configured to supply power to the inverter through the first branch and the second branch.

[0006] As a preferred solution of the utility model, the switch module includes a first switch tube and a second switch tube, the first end of the first switch tube is electrically connected to the first end of the second switch tube, the second end of the first switch tube is electrically connected to the negative pole of the photovoltaic component, and the second end of the second switch tube is electrically connected to the negative pole of the photovoltaic component.

[0007] As a preferred solution of the utility model, the first branch also includes a third switch tube, a fourth switch tube and a first inductor, the first end of the third switch tube is electrically connected to one end of the first inductor element, and the second end of the third switch tube is electrically connected to the positive pole of the photovoltaic component; the first end of the fourth switch tube is electrically connected to the negative pole of the photovoltaic component, and the second end of the fourth switch tube is electrically connected to one end of the first inductor element; one end of the first inductor is electrically connected to the first end of the third switch tube, and the other end of the first inductor is electrically connected to the negative pole of the photovoltaic component.

[0008] As a preferred solution of the utility model, the second branch includes a fifth switch tube, a sixth switch tube and a second inductor element. The first end of the fifth switch tube is electrically connected to the second end of the third switch tube, and the second end of the fifth switch tube is electrically connected to the switch module; the first end of the sixth switch tube is electrically connected to the negative pole of the photovoltaic component, and the second end of the sixth switch tube is electrically connected to the first end of the fifth switch tube; one end of the second inductor element is electrically connected to the second end of the third switch tube, and the other end of the second inductor element is electrically connected to the first end of the fifth switch tube.

[0009] As a preferred solution of the utility model, the switch module also includes a battery, a seventh switch tube and an eighth switch tube, the first end of the seventh switch tube is electrically connected to one end of the first inductor element, and the second end of the seventh switch tube is electrically connected to the second end of the second switch tube; the first end of the eighth switch tube is electrically connected to the positive pole of the battery, and the second end of the eighth switch tube is electrically connected to the second end of the seventh switch tube; the negative pole of the battery is electrically connected to the negative pole of the photovoltaic module.

[0010] As a preferred solution of the utility model, in the battery step-down charging mode, the third switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are turned off.

[0011] As a preferred solution of the utility model, in the battery step-down charging mode, the fourth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube, the fifth switch tube and the sixth switch tube are turned off.

[0012] As a preferred solution of the utility model, in the battery boost charging mode, the sixth switch tube, the first switch tube, the second switch tube and the eighth switch tube are turned on, and the third switch tube, the fourth switch tube, the fifth switch tube and the seventh switch tube are turned off.

[0013] As a preferred solution of the utility model, in the battery boost charging mode, the fifth switch tube, the first switch tube, the second switch tube and the eighth switch tube are turned on, and the third switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube are turned off.

[0014] As a preferred solution of the utility model, in the battery buck charging-boost circuit direct-through mode, the third switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the fourth switch tube and the sixth switch tube are turned off.

[0015] As a preferred solution of the utility model, in the battery buck charging-boost circuit direct-through mode, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube and the sixth switch tube are turned off.

[0016] As a preferred solution of the utility model, in the battery buck charging-boost circuit boost mode, the third switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the fourth switch tube and the fifth switch tube are turned off.

[0017] As a preferred solution of the utility model, in the battery buck charging-boost circuit boost mode, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube and the sixth switch tube are turned off.

[0018] As a preferred solution of the utility model, in the photovoltaic power generation direct mode, the fifth switch tube is turned on, and the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube are disconnected.

[0019] As a preferred solution of the utility model, in the battery discharge mode, the eighth switch tube, the first switch tube and the second switch tube are turned on, and the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are turned off.

[0020] As a preferred solution of the utility model, the DCDC module also includes a first capacitor, a second capacitor and a third capacitor, one end of the first capacitor is electrically connected to the positive electrode of the photovoltaic component, and the other end of the first capacitor is electrically connected to the negative electrode of the photovoltaic component; one end of the second capacitor is electrically connected to one end of the first inductor element, and the other end of the second capacitor is electrically connected to the negative electrode of the photovoltaic component; one end of the third capacitor is electrically connected to the second end of the first switch tube, and the other end of the third capacitor is electrically connected to the negative electrode of the photovoltaic component.

[0021] Another aspect of the present application provides an electronic device provided with any one of the above circuit structures.

[0022] like Figure 1As shown, the DCDC module 100 is electrically connected to the photovoltaic assembly 400, the switch module 200 is electrically connected to the DCDC module 100, one end of the inverter 300 is electrically connected to the switch module 200, and the other end of the inverter 300 is electrically connected to the DCDC module 100. The DCDC module 100 includes a first branch 101 and a second branch 102. The switch module 200 includes a first switch tube 2001 and a second switch tube 2002. The first end of the first switch tube 2001 is electrically connected to the first end of the second switch tube 2002. The second end of the first switch tube 2001 is electrically connected to the negative pole of the photovoltaic component 400, and the second end of the second switch tube 2002 is electrically connected to the negative pole of the photovoltaic component 400. The first switch tube 2001 and the second switch tube 2002 are both power switch tubes. The switch module is in the first control state, which means that the first switch tube 2001 and the second switch tube 2002 are both disconnected. At this time, the first branch 101 and the second branch 102 are turned on, and the photovoltaic component 400 is configured to supply power to the inverter 300 through the first branch 101 and the second branch 102.

[0023] Optional, such as Figure 2 As shown, the first branch refers to the step-down loop, and the first branch 101 includes a third switch tube 1013, a fourth switch tube 1014, a first inductor element 1011, a first capacitor C1 and a second capacitor C2. The first end of the third switch tube 1013 is electrically connected to one end of the first inductor element 1011, and the second end of the third switch tube 1013 is electrically connected to the positive electrode of the photovoltaic component 400; the first end of the fourth switch tube 1014 is electrically connected to the negative electrode of the photovoltaic component 400, and the second end of the fourth switch tube 1014 is electrically connected to one end of the first inductor element 1011. The first inductor 1011 is electrically connected to the first end of the third switch tube 1013, and the other end of the first inductor 1011 is electrically connected to the negative electrode of the photovoltaic component 400. The first inductor 1011 is a power inductor. One end of the first capacitor C1 is electrically connected to the positive electrode of the photovoltaic component 400, and the other end of the first capacitor C1 is electrically connected to the negative electrode of the photovoltaic component 400. One end of the second capacitor C2 is electrically connected to one end of the first inductor 1011, and the other end of the second capacitor C2 is electrically connected to the negative electrode of the photovoltaic component 400.

[0024] The second branch refers to the boost loop. The second branch 102 includes a fifth switch tube 1025, a sixth switch tube 1026, a second inductor element 1012 and a third capacitor C3. The first end of the fifth switch tube 1025 is electrically connected to the second end of the third switch tube 1013, and the second end of the fifth switch tube 1025 is electrically connected to the switch module 200; the first end of the sixth switch tube 1026 is electrically connected to the negative electrode of the photovoltaic component 400, and the second end of the sixth switch tube 1026 is electrically connected to the first end of the fifth switch tube 1025; one end of the second inductor element 1012 is electrically connected to the second end of the third switch tube 1013, and the other end of the second inductor element 1012 is electrically connected to the first end of the fifth switch tube 1025, one end of the third capacitor C3 is electrically connected to the second end of the first switch tube 2001, and the other end of the third capacitor C3 is electrically connected to the negative electrode of the photovoltaic component 400.

[0025] The switch module 200 also includes a battery U, a seventh switch tube 2007 and an eighth switch tube 2008. The first end of the seventh switch tube 2007 is electrically connected to one end of the first inductor element 1011, and the second end of the seventh switch tube 2007 is electrically connected to the second end of the second switch tube 2002; the first end of the eighth switch tube 2008 is electrically connected to the positive electrode of the battery U, and the second end of the eighth switch tube 2008 is electrically connected to the second end of the seventh switch tube 2007; the negative electrode of the battery U is electrically connected to the negative electrode of the photovoltaic component 400.

[0026] Optional, such as Figure 3 As shown, in the battery U step-down charging mode, the third switch tube 1013, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the fourth switch tube 1014, the fifth switch tube 1025 and the sixth switch tube 1026 are turned off.

[0027] Optional, such as Figure 4 As shown, in the battery U step-down charging mode, the fourth switch tube 1014, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013, the fifth switch tube 1025 and the sixth switch tube 1026 are turned off.

[0028] Optional, such as Figure 5 As shown, in the battery U boost charging mode, the sixth switch tube 1026, the first switch tube 2001, the second switch tube 2002 and the eighth switch tube 2008 are turned on, and the third switch tube 1013, the fourth switch tube 1014, the fifth switch tube 1025 and the seventh switch tube 2007 are turned off.

[0029] Optional, such as Figure 6As shown, in the battery U boost charging mode, the fifth switch tube 1025, the first switch tube 2001, the second switch tube 2002 and the eighth switch tube 2008 are turned on, and the third switch tube 1013, the fourth switch tube 1014, the sixth switch tube 1026 and the seventh switch tube 2007 are turned off.

[0030] Optional, such as Figure 7 As shown, in the battery U buck charging-boost circuit direct-through mode, the third switch tube 1013, the fifth switch tube 1025, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the fourth switch tube 1014 and the sixth switch tube 1026 are turned off.

[0031] Optional, such as Figure 8 As shown, in the battery U buck charging-boost circuit direct-through mode, the fourth switch tube 1014, the fifth switch tube 1025, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013 and the sixth switch tube 1026 are turned off.

[0032] Optional, such as Fig. 9 As shown, in the boost mode of the battery U buck charging-boost circuit, the third switch tube 1013, the sixth switch tube 1026, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the fourth switch tube 1014 and the fifth switch tube 1025 are turned off.

[0033] Optional, such as Fig.10 As shown, in the boost mode of the battery U buck charging-boost circuit, the fourth switch tube 1014, the fifth switch tube 1025, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013 and the sixth switch tube 1026 are turned off.

[0034] Optional, such as Fig.11 As shown, in the photovoltaic power generation direct mode, the fifth switch tube 1025 is turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013, the fourth switch tube 1014, the sixth switch tube 1026, the seventh switch tube 2007 and the eighth switch tube 2008 are disconnected.

[0035] Optional, such as Fig.12 As shown, in the battery U discharge mode, the eighth switch tube 2008, the first switch tube 2001 and the second switch tube 2002 are turned on, and the third switch tube 1013, the fourth switch tube 1014, the fifth switch tube 1025, the sixth switch tube 1026 and the seventh switch tube 2007 are turned off.

[0036] An inverter circuit and an electronic device according to the embodiments of the present application have the following beneficial effects: the utility model adds a power inductor element in the DCDC module and two power switch tubes in the switch module, so that the boost mode and the buck mode can work in the optimal state at the same time, thereby improving the conversion efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural block diagram of an inverter circuit according to a specific embodiment of the present application.

[0038] Figure 2 It is a circuit diagram of an inverter circuit according to a specific embodiment of the present application.

[0039] Figure 3 It is a circuit diagram of an inverter circuit working mode according to a specific embodiment of the present application.

[0040] Figure 4 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0041] Figure 5 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0042] Figure 6 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0043] Figure 7 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0044] Figure 8 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0045] Fig. 9 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0046] Fig.10 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0047] Fig.11 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application.

[0048] Fig.12 It is a circuit diagram of an inverter circuit working mode according to another specific embodiment of the present application. DETAILED DESCRIPTION

[0049] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0050] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0051] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0052] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0053] Some implementation methods of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0054] Working mode 1 is the battery U step-down charging mode. This mode is suitable for situations where the voltage of the solar panel is higher than the battery U voltage, and the battery U is charged first. The maximum power tracking is achieved by the step-down circuit. The circuit diagram is as follows: Figure 3 and Figure 4 The first circuit diagram of working mode 1 is shown in Figure 3 As shown, the third switch tube 1013, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, the first switch tube 2001, the second switch tube 2002, the fourth switch tube 1014, the fifth switch tube 1025 and the sixth switch tube 1026 are turned off, and the current flows from the positive electrode of the photovoltaic component 400 through the third switch tube 1013, the first inductor element 1011, the seventh switch tube 2007, the eighth switch tube 2008 and the battery U. The second circuit diagram of the working mode 1 is shown in FIG. Figure 4 As shown, the fourth switch tube 1014, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, the first switch tube 2001, the second switch tube 2002, the third switch tube 1013, the fifth switch tube 1025 and the sixth switch tube 1026 are disconnected, and the current flows from the fourth switch tube 1014 through the first inductor element 1011, the seventh switch tube 2007, the eighth switch tube 2008 and the battery U.

[0055] Working mode 2 is the battery U boost charging mode. This mode is suitable for situations where the voltage of the solar panel is lower than the voltage of the battery U, and the battery U is charged first. The maximum power tracking is achieved by the boost circuit. The working circuit diagram is as follows: Figure 5 and Figure 6 The first circuit diagram of working mode 2 is shown in Figure 5 As shown, the sixth switch tube 1026, the first switch tube 2001, the second switch tube 2002 and the eighth switch tube 2008 are turned on, the third switch tube 1013, the fourth switch tube 1014, the fifth switch tube 1025 and the seventh switch tube 2007 are turned off, and the current flows from the positive electrode of the photovoltaic component 400 through the second inductor element 1012, the sixth switch tube 1026, the third capacitor C3, the first switch tube 2001, the second switch tube 2002, the eighth switch tube 2008 and the battery U. The second circuit diagram of the working mode 2 is shown in FIG. Figure 6 As shown, the fifth switch tube 1025, the first switch tube 2001, the second switch tube 2002 and the eighth switch tube 2008 are turned on, and the third switch tube 1013, the fourth switch tube 1014, the sixth switch tube 1026 and the seventh switch tube 2007 are turned off, and the current flows from the positive electrode of the photovoltaic component 400 through the second inductor element 1012, the fifth switch tube 1025, the first switch tube 2001, the second switch tube 2002, the eighth switch tube 2008 and the battery U.

[0056] The third working mode is the battery U buck charging-boost circuit direct mode, which is suitable for the occasion where the voltage of the solar panel is lower than the battery U voltage. The fifth switch tube 1025 is directly connected, and the inverter 300 has the MPPT function. The inverter 300 realizes the maximum power tracking to maximize the photovoltaic to grid power generation efficiency. The working circuit diagram is as follows Figure 7 and Figure 8 The first circuit diagram of working mode three is shown in Figure 7 As shown, the third switch tube 1013, the fifth switch tube 1025, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, the first switch tube 2001, the second switch tube 2002, the fourth switch tube 1014 and the sixth switch tube 1026 are turned off, one current flows from the positive electrode of the photovoltaic component 400 through the second inductor element 1012 and the fifth switch tube 1025 to the inverter 300, and the other current flows from the positive electrode of the photovoltaic component 400 through the third switch tube 1013, the first inductor element 1011, the seventh switch tube 2007, the eighth switch tube 2008 and the battery U. The second circuit diagram of the working mode three is shown in FIG. Figure 8 As shown, the fourth switch tube 1014, the fifth switch tube 1025, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013 and the sixth switch tube 1026 are turned off. One current flows from the positive electrode of the photovoltaic component 400 through the second inductor element 1012 and the fifth switch tube 1025 to the inverter 300, and the other current flows from the fourth switch tube 1014 through the first inductor element 1011, the seventh switch tube 2007, the eighth switch tube 2008 and the battery U.

[0057] Working mode 4 is the battery U buck charging-boost circuit boost working mode. This mode is suitable for situations where the solar panel voltage is lower than the battery U voltage. At the same time, the inverter 300 does not need to have the MPPT function. The maximum power tracking is achieved by the boost circuit and the buck circuit at the same time to maximize the photovoltaic to grid power generation efficiency. The working circuit diagram is as follows Fig. 9 and Fig.10 The first circuit diagram of working mode 4 is shown as follows Fig. 9 As shown, the third switch tube 1013, the sixth switch tube 1026, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, the first switch tube 2001, the second switch tube 2002, the fourth switch tube 1014 and the fifth switch tube 1025 are turned off, one current flows from the positive electrode of the photovoltaic component 400 through the second inductor element 1012, the sixth switch tube 1026, the third capacitor C3 to the inverter 300, and the other current flows from the positive electrode of the photovoltaic component 400 through the third switch tube 1013, the first inductor element 1011, the seventh switch tube 2007, the eighth switch tube 2008 and the battery. The second circuit diagram of the fourth working mode is shown in FIG. Fig.10 As shown, the fourth switch tube 1014, the fifth switch tube 1025, the seventh switch tube 2007 and the eighth switch tube 2008 are turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013 and the sixth switch tube 1026 are turned off. One current flows from the positive electrode of the photovoltaic component 400 through the second inductor element 1012 and the fifth switch tube 1025 to the inverter 300, and the other current flows from the fourth switch tube 1014 through the first inductor element 1011, the seventh switch tube 2007, the eighth switch tube 2008 and the battery U.

[0058] Working mode 5 is the photovoltaic power generation direct mode. This mode is suitable for the case where the battery U does not need to be charged. At the same time, the inverter 300 has the MPPT function. The inverter 300 implements maximum power tracking to maximize the photovoltaic to grid power generation efficiency. The working circuit diagram is as follows: Fig.11 The fifth switch tube 1025 is turned on, and the first switch tube 2001, the second switch tube 2002, the third switch tube 1013, the fourth switch tube 1014, the sixth switch tube 1026, the seventh switch tube 2007 and the eighth switch tube 2008 are turned off. The current flows from the positive electrode of the photovoltaic module 400 through the second inductor element 1012 and the fifth switch tube 1025 to the inverter 300.

[0059] Working mode 6 is the battery U discharge mode, which is suitable for pure battery U discharge. The inverter 300 does not need to have the MPPT function, but only realizes the inverter function. The working circuit diagram is as follows: Fig.12 The eighth switch tube 2008, the first switch tube 2001 and the second switch tube 2002 are turned on, and the third switch tube 1013, the fourth switch tube 1014, the fifth switch tube 1025, the sixth switch tube 1026 and the seventh switch tube 2007 are turned off. The current flows from the battery U through the eighth switch tube 2008, the second switch tube 2002, the first switch tube 2001 to the inverter 300.

[0060] The switch module of the utility model adds a first power switch tube and a second power switch tube. The introduction of the first power switch tube and the second power switch tube not only enables the battery to have an independent charging circuit, but also enables the boost working mode and the buck working mode to work at the same time. At the same time, by adding a power inductor to the DCDC module and introducing the power inductor, the boost circuit and the buck circuit are optimized from a series mode to a parallel mode, so that the boost working mode and the buck working mode have independent main circuits and magnetic devices. The two modes are designed with separate parameters, which not only reduces the coupling between the two mode parameters, but also takes into account the optimal working state of the magnetic devices of the two modes, thereby improving the conversion efficiency of the converter. The parallel mode also enables the channel of any working mode to work normally when a fault occurs in the channel of the other working mode, thereby improving the reliability of the system.

[0061] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0062] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0063] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0064] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. An inverter circuit, characterized in that: The inverter circuit comprises: A DCDC module, the DCDC module is electrically connected to the photovoltaic module, and the DCDC module includes a first branch and a second branch; A switch module, the switch module is electrically connected to the DCDC module; an inverter, one end of which is electrically connected to the switch module, and the other end of which is electrically connected to the DCDC module; When the switch module is in a first control state, the first branch is connected to the second branch, and the photovoltaic assembly is configured to supply power to the inverter through the first branch and the second branch.

2. The inverter circuit according to claim 1, characterized in that: The switch module includes a first switch tube and a second switch tube, wherein the first end of the first switch tube is electrically connected to the first end of the second switch tube, the second end of the first switch tube is electrically connected to the negative pole of the photovoltaic component, and the second end of the second switch tube is electrically connected to the negative pole of the photovoltaic component.

3. The inverter circuit according to claim 2, characterized in that: The first branch includes a third switch tube, a fourth switch tube and a first inductor, wherein a first end of the third switch tube is electrically connected to one end of the first inductor, and a second end of the third switch tube is electrically connected to the positive pole of the photovoltaic component; a first end of the fourth switch tube is electrically connected to the negative pole of the photovoltaic component, and a second end of the fourth switch tube is electrically connected to one end of the first inductor; one end of the first inductor is electrically connected to the first end of the third switch tube, and the other end of the first inductor is electrically connected to the negative pole of the photovoltaic component.

4. The inverter circuit according to claim 3, characterized in that: The second branch includes a fifth switch tube, a sixth switch tube and a second inductor element. The first end of the fifth switch tube is electrically connected to the second end of the third switch tube, and the second end of the fifth switch tube is electrically connected to the switch module; the first end of the sixth switch tube is electrically connected to the negative pole of the photovoltaic component, and the second end of the sixth switch tube is electrically connected to the first end of the fifth switch tube; one end of the second inductor element is electrically connected to the second end of the third switch tube, and the other end of the second inductor element is electrically connected to the first end of the fifth switch tube.

5. The inverter circuit according to claim 4, characterized in that: The switch module also includes a battery, a seventh switch tube and an eighth switch tube, wherein the first end of the seventh switch tube is electrically connected to one end of the first inductor, and the second end of the seventh switch tube is electrically connected to the second end of the second switch tube; the first end of the eighth switch tube is electrically connected to the positive electrode of the battery, and the second end of the eighth switch tube is electrically connected to the second end of the seventh switch tube; and the negative electrode of the battery is electrically connected to the negative electrode of the photovoltaic module.

6. The inverter circuit according to claim 5, characterized in that: In the battery step-down charging mode, the third switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are turned off.

7. The inverter circuit according to claim 5, characterized in that: In the battery step-down charging mode, the fourth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube, the fifth switch tube and the sixth switch tube are turned off.

8. The inverter circuit according to claim 5, characterized in that: In the battery boost charging mode, the sixth switch tube, the first switch tube, the second switch tube and the eighth switch tube are turned on, and the third switch tube, the fourth switch tube, the fifth switch tube and the seventh switch tube are turned off.

9. The inverter circuit according to claim 5, characterized in that: In the battery boost charging mode, the fifth switch tube, the first switch tube, the second switch tube and the eighth switch tube are turned on, and the third switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube are turned off.

10. The inverter circuit according to claim 5, characterized in that: In the battery buck charging-boost circuit direct-through mode, the third switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the fourth switch tube and the sixth switch tube are turned off.

11. The inverter circuit according to claim 5, characterized in that: In the battery buck charging-boost circuit direct-through mode, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube and the sixth switch tube are turned off.

12. The inverter circuit according to claim 5, characterized in that: In the boost mode of the battery buck charging-boost circuit, the third switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the fourth switch tube and the fifth switch tube are turned off.

13. The inverter circuit according to claim 5, characterized in that: In the boost mode of the battery buck charging-boost circuit, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube and the sixth switch tube are turned off.

14. The inverter circuit according to claim 5, characterized in that: In the photovoltaic power generation direct mode, the fifth switch tube is turned on, and the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube are disconnected.

15. The inverter circuit according to claim 5, characterized in that: In the battery discharging mode, the eighth switch tube, the first switch tube and the second switch tube are turned on, and the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are turned off.

16. The inverter circuit according to claim 3, characterized in that: The DCDC module also includes a first capacitor, a second capacitor and a third capacitor, one end of the first capacitor is electrically connected to the positive electrode of the photovoltaic component, and the other end of the first capacitor is electrically connected to the negative electrode of the photovoltaic component; one end of the second capacitor is electrically connected to one end of the first inductor, and the other end of the second capacitor is electrically connected to the negative electrode of the photovoltaic component; one end of the third capacitor is electrically connected to the second end of the first switch tube, and the other end of the third capacitor is electrically connected to the negative electrode of the photovoltaic component.

17. An electronic device, characterized in that: Comprising a circuit structure as described in any one of claims 1-16.

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