CN221177552U

CN221177552U - Input circuit, inverter and electronic equipment

Info

Publication number: CN221177552U
Application number: CN202322709655.3U
Authority: CN
Inventors: 邓帅; 胡双平; 王进
Original assignee: Shenzhen Lux Power Technology Co ltd
Current assignee: Shenzhen Lux Power Technology Co ltd
Priority date: 2023-10-10
Filing date: 2023-10-10
Publication date: 2024-06-18
Anticipated expiration: 2033-10-10

Abstract

The application provides an input circuit, an inverter and electronic equipment, wherein the input circuit comprises at least two Buck-Boost circuits, the input ends of the Buck-Boost circuits are used for being electrically connected with a photovoltaic panel or an energy storage battery, and the output ends of the Buck-Boost circuits are electrically connected with a main control module through a bus; the main control module is used for determining the control mode of each Buck-Boost circuit according to the control parameters, outputting a control instruction to the corresponding Buck-Boost circuit based on the control mode, wherein the control mode is a photovoltaic mode or an energy storage battery mode; the Buck-Boost circuit is used for switching to an operation mode corresponding to the control mode according to the control instruction; therefore, by arranging the Buck-Boost circuit which can be connected with the photovoltaic panel or the energy storage battery, a user can select different input sources to be connected with any Buck-Boost circuit in different scenes according to actual needs, the limit of hard connection of the circuits is avoided, and the effect of improving the utilization rate of the input circuit is achieved.

Description

Input circuit, inverter and electronic equipment

Technical Field

The application belongs to the field of photovoltaics, and particularly relates to an input circuit, an inverter and electronic equipment.

Background

The photovoltaic energy storage inverter is used as a core component in a photovoltaic energy storage system and is responsible for converting energy among an energy storage battery, a photovoltaic panel, a power grid and a load. The topology structure of the traditional photovoltaic energy storage inverter is composed of a maximum power point tracking (Maximum Power Point Tracking, MPPT) circuit at an independent photovoltaic side, a step-up and step-down circuit at a battery side, a DC-AC conversion circuit at an inversion side and a filter circuit for alternating current measurement.

The MPPT circuit at the photovoltaic side and the step-up/step-down circuit at the battery side are used as input circuits of the photovoltaic energy storage inverter and are respectively used for connecting the photovoltaic panel and the energy storage battery; different usage scenarios may require different numbers of photovoltaic panels and energy storage batteries to be connected, so that the connection number of the input circuits of the photovoltaic energy storage inverter cannot be accurately determined, and more MPPT circuits on the photovoltaic side and more buck-boost circuits on the battery side can be configured to meet more usage scenarios. However, in the conventional use scenario, a large number of input circuits are not needed, i.e. more input circuits are idle, so that the utilization rate of the input circuits is low.

Disclosure of utility model

An objective of an embodiment of the present application is to provide an input circuit, an inverter, and an electronic device, so as to solve a problem of low utilization rate of the input circuit in the related art.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows:

In a first aspect, an input circuit is provided, the input circuit comprising at least two Buck-Boost circuits;

The input end of the Buck-Boost circuit is electrically connected with the photovoltaic panel or the energy storage battery, and the output end of the Buck-Boost circuit is electrically connected with the main control module through a bus;

The main control module is used for determining the control mode of each Buck-Boost circuit according to the control parameters, outputting a control instruction to the corresponding Buck-Boost circuit based on the control mode, wherein the control mode is a photovoltaic mode or an energy storage battery mode;

And the Buck-Boost circuit is used for switching to an operation mode corresponding to the control mode according to the control instruction.

Optionally, the Buck-Boost circuit comprises a first capacitor, a second capacitor, a first inductor, a first power switch tube and a second power switch tube;

The input end of Buck-Boost circuit is used for connecting the positive and negative poles of photovoltaic board or energy storage battery, the one end of first inductance with the one end electricity of first electric capacity is connected, the other end ground connection of first electric capacity, the other end of first inductance with the one end electricity of first power switch tube is connected, the other end ground connection of first power switch tube, the other end of first inductance still with the one end electricity of second power switch tube is connected, the other end of second power switch tube with the one end electricity of second electric capacity is connected, the other end ground connection of second electric capacity, the second electric capacity be used for with the main control module connects in parallel.

Optionally, one of the photovoltaic panels or the energy storage battery is electrically connected to an input of one or more of the Buck-Boost circuits.

Optionally, the first power switch tube and the second power switch tube are insulated gate bipolar transistors or MOSFETs.

Optionally, the photovoltaic mode is a maximum power point tracking mode, and the energy storage battery mode is a step-up and step-down mode.

In a second aspect, an inverter is provided, including a bus capacitor, a main control module, and an input circuit as in any one of the first aspects;

Each Buck-Boost circuit in the input circuit is connected with the bus capacitor in parallel, the bus capacitor is connected with the main control module in parallel, and the main control module is used for being electrically connected with load equipment.

Optionally, the inverter further includes a filter circuit, an input end of the filter circuit is electrically connected with the main control module, and an output end of the filter circuit is electrically connected with the load device.

In a third aspect, there is provided an electronic device comprising the inverter according to any one of the second aspects.

The input circuit, the inverter and the electronic equipment provided by the embodiment of the application have at least the following beneficial effects: the input circuit comprises at least two Buck-Boost circuits, the input end of each Buck-Boost circuit is electrically connected with the photovoltaic panel or the energy storage battery, and the output end of each Buck-Boost circuit is electrically connected with the main control module through a bus; the main control module is used for determining the control mode of each Buck-Boost circuit according to the control parameters, outputting a control instruction to the corresponding Buck-Boost circuit based on the control mode, wherein the control mode is a photovoltaic mode or an energy storage battery mode; the Buck-Boost circuit is used for switching to an operation mode corresponding to the control mode according to the control instruction; therefore, by arranging the Buck-Boost circuit which can be connected with the photovoltaic panel or the energy storage battery, a user can select different input sources to be connected with any Buck-Boost circuit in different scenes according to actual needs, the limit of hard connection of the circuits is avoided, and the effect of improving the utilization rate of the input circuit is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or exemplary technical descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of an input circuit according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an input circuit according to another embodiment of the present application;

FIG. 3 is a schematic diagram of an application scenario of a Buck-Boost circuit provided by an embodiment of the present application;

fig. 4 is a schematic structural diagram of an inverter according to an embodiment of the present application;

fig. 5 is a schematic diagram of an application scenario of an inverter according to an embodiment of the present application.

Wherein, each reference numeral in the figure mainly marks:

1. An input circuit; 11. a Buck-Boost circuit; 2. and a main control module.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.

In the description of the present application, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrase "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The existing photovoltaic energy storage inverter is used as a core component in a photovoltaic energy storage system and is responsible for converting energy among an energy storage battery, a photovoltaic panel, a power grid and a load. The topology structure of the traditional photovoltaic energy storage inverter is composed of an MPPT circuit on a single photovoltaic side, a Buck-Boost circuit on a battery side, a DC-AC conversion circuit on an inversion side and a filtering circuit for alternating current measurement, wherein the MPPT circuit on the photovoltaic side is used for connecting a photovoltaic panel, a Boost circuit is usually adopted, and the Buck-Boost circuit is usually adopted for the Buck-Boost circuit on the battery side, and the two circuits are different in structure, so that the problem that the two circuits cannot be used in a crossing way exists.

However, in the implementation process, the user may need to connect different numbers of photovoltaic panels or energy storage batteries according to different scenes, for example, need to connect more photovoltaic panels and fewer energy storage batteries in a good weather time and date, and need to connect fewer photovoltaic panels and more energy storage batteries in a overcast and rainy weather time and date, at this time, the number of the MPPT circuits and the buck-boost circuits originally set by the inverter may be limited, for example, the number of the MPPT circuits and the buck-boost circuits is 10, and when the weather is good, the user needs to connect 15 photovoltaic panels and 5 energy storage batteries, at this time, the number of the MPPT circuits is obviously insufficient, and the number of the buck-boost circuits may be 5; on the contrary, in overcast and rainy weather, the user needs to connect 5 photovoltaic boards and 15 energy storage batteries, and step-up and step-down circuit's quantity is obvious not enough this moment, and MPPT circuit can be vacant 5, consequently can't satisfy the user demand of user's different scenes to and each input circuit has the problem that the utilization ratio is low.

Referring to fig. 1, the present application provides an input circuit 1, the input circuit 1 includes at least two Buck-Boost circuits 11;

The input end of the Buck-Boost circuit 11 is electrically connected with the photovoltaic panel or the energy storage battery, and the output end of the Buck-Boost circuit 11 is electrically connected with the main control module 2 through a bus;

The main control module 2 is used for determining the control mode of each Buck-Boost circuit 11 according to the control parameters, outputting a control instruction to the corresponding Buck-Boost circuit 11 based on the control mode, wherein the control mode is a photovoltaic mode or an energy storage battery mode;

The Buck-Boost circuit 11 is used for switching to an operation mode corresponding to the control mode according to the control instruction.

Optionally, the photovoltaic mode is a Maximum Power Point Tracking (MPPT) mode, and the energy storage battery mode is a buck-boost mode.

The input circuit 1 in this embodiment includes at least two Buck-Boost circuits 11, and since the Buck-Boost circuits 11 can simultaneously function as an MPPT circuit and a Buck-Boost circuit by switching operation modes, the Buck-Boost circuits 11 are electrically connected with the main control module 2 through a bus, so that the Buck-Boost circuits 11 can be switched to an operation mode corresponding to the control mode according to a control instruction output by the main control module 2; in one example, the input end of the Buck-Boost circuit 11 is electrically connected with the photovoltaic panel, at this time, the main control module 2 determines that the control mode of the Buck-Boost circuit 11 is a photovoltaic mode according to the control parameter, so as to output a control instruction to the Buck-Boost circuit 11, and the Buck-Boost circuit 11 switches to an operation mode corresponding to the photovoltaic mode, that is, an MPPT circuit operation mode, based on the control instruction; on the contrary, the input end of the Buck-Boost circuit 11 is electrically connected with the energy storage battery, at this time, the main control module 2 determines that the energy storage battery mode of the Buck-Boost circuit 11 is a photovoltaic mode according to the control parameter, so as to output a control instruction to the Buck-Boost circuit 11, and the Buck-Boost circuit 11 switches to an operation mode corresponding to the energy storage battery mode, namely, an operation mode of the Buck-Boost circuit based on the control instruction.

The control parameter may be determined based on a user input instruction in advance, or the main control module 2 determines according to a range where the input terminal voltage of the Buck-Boost circuit 11 is located. The process of determining based on the user pre-input instruction may be, for example, that the output circuit includes 5 Buck-Boost circuits 11, the user connects the front 2 Buck-Boost circuits 11 with the photovoltaic panel according to the requirement, the rear 3 Buck-Boost circuits 11 with the energy storage battery, and inputs the instruction according to the connection condition, so that the control parameter determined by the main control module 2 according to the input instruction is that the control mode of the front 2 Buck-Boost circuits 11 is the photovoltaic mode, and the control mode of the rear 3 front 2 Buck-Boost circuits 11 is the energy storage battery mode; the process of determining by the main control module 2 according to the range of the collected input end voltage of the Buck-Boost circuit 11 may be that the main control module 2 collects the input end voltage of each Buck-Boost circuit 11, compares the input end voltage with the photovoltaic panel voltage range and the energy storage battery voltage range, determines whether the voltage belongs to the photovoltaic panel voltage range or the energy storage battery voltage range, determines the control mode of the Buck-Boost circuit 11 to be the photovoltaic mode if the voltage belongs to the photovoltaic panel voltage range, determines the energy storage battery mode if the voltage belongs to the energy storage battery voltage range, traverses each Buck-Boost circuit 11, and finally determines the control parameters based on all the control modes. It should be noted that the foregoing description is for illustrative purposes only, and other manners of determining the control parameters may be adopted in the implementation.

Therefore, the input circuit 1 in this embodiment is provided with a plurality of Buck-Boost circuits 11, and one or more photovoltaic panels or energy storage batteries can be optionally connected according to the requirements, so as to achieve the effect of improving the utilization rate of the input circuit 1.

Referring to fig. 2, the buck-Boost circuit 11 includes a first capacitor C1, a second capacitor C2, a first inductor L1, a first power switch tube IGBT1, and a second power switch tube IGBT2;

The two ends of the first capacitor C1 are used as input ends of a Buck-Boost circuit 11 and are used for connecting positive and negative electrodes of a photovoltaic panel or an energy storage battery, one end of the first inductor L1 is electrically connected with one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, the other end of the first inductor L1 is electrically connected with one end of the first power switch tube IGBT1, the other end of the first power switch tube IGBT1 is grounded, the other end of the first inductor L1 is also electrically connected with one end of the second power switch tube IGBT2, the other end of the second power switch tube IGBT2 is electrically connected with one end of the second capacitor C2, the other end of the second capacitor C2 is grounded, and the second capacitor C2 is used for being connected with the main control module 2 in parallel.

The Buck-Boost circuit 11 in the embodiment is to replace the power switch tubes of the Buck bridge with diodes, so that the switching of the operation modes of the Buck-Boost circuit 11 is realized by controlling the on-off states of different power switch tubes. For example, the on-off state of the second power switch tube IGBT2 is controlled to realize the diode function, and at this time, the operation mode of the Buck-Boost circuit 11 is the MPPT circuit mode applied to the photovoltaic panel, and the on-off state of the second power switch tube IGBT2 is controlled to play a role of bidirectional flow, and at this time, the operation mode of the Buck-Boost circuit 11 is the Buck-Boost circuit mode applied to the energy storage battery. In addition, the boost and buck control of the circuit or the Maximum Power Point Tracking (MPPT) control can be realized by adjusting the duty ratio so as to adapt to different operation modes.

Even if the control mode of each Buck-Boost circuit 11 can be determined according to the control parameters, there is a problem that the control parameters are not consistent with the actual connection conditions, resulting in that the control mode does not correspond to the Buck-Boost circuit 11, for example, the control determined according to the user input instruction indicates that the front 2 Buck-Boost circuits 11 are connected to the photovoltaic panel, the rear 3 Buck-Boost circuits 11 are connected to the energy storage battery, and the rear 3 Buck-Boost circuits 11 are not connected to any device or connected non-energy storage battery, and at this time, a problem of control error occurs if the control mode of the rear 3 Buck-Boost circuits 11 is determined according to the control parameters.

In one embodiment, the main control module 2 is further configured to determine an access state of each Buck-Boost circuit 11 according to the control parameter, where the access state indicates whether the input end of the Buck-Boost circuit 11 is connected to the photovoltaic panel or the energy storage battery;

In the case that the connected state indicates that the photovoltaic panel or the energy storage battery is connected, a control command is output to the corresponding Buck-Boost circuit 11.

In this embodiment, after determining the control parameters, the access state of each Buck-Boost circuit 11 may also be determined, where the access state indicates whether the input end of the Buck-Boost circuit 11 is connected to a photovoltaic panel or an energy storage battery, and the specific determining process may be to determine whether the Buck-Boost circuit 11 is connected to an input device or not, or determine whether the input end of the Buck-Boost circuit 11 is connected to the photovoltaic panel or the energy storage battery according to a voltage range in which the voltage of the input end of the Buck-Boost circuit 11 is located, so that, when it is determined that the access state indicates that the Buck-Boost circuit 11 is connected to the photovoltaic panel or the energy storage battery, whether the access state is matched with the control mode may be determined, for example, the access state indicates that the input end of the Buck-Boost circuit 11 is connected to the photovoltaic panel, where the control mode is the photovoltaic mode and is the matching, and if the control mode is the energy storage battery mode is not the matching, or vice versa; if the control mode is matched, a control instruction is output to the corresponding Buck-Boost circuit 11, and if the control mode is not matched, a prompt message of a connection error is output, so that the control mode and equipment connected with the input end of the Buck-Boost circuit 11 are consistent.

In one embodiment, the main control module 2 is further configured to return to determining the access status of each Buck-Boost circuit 11 if the access status indicates that the photovoltaic panel or the energy storage battery is not connected.

In this embodiment, when the access state of the Buck-Boost circuit 11 indicates that the photovoltaic panel or the energy storage battery is not connected, it is indicated that the input end of the Buck-Boost circuit 11 is connected to other devices, and then it is not necessary to control the Buck-Boost circuit 11 to switch the operation mode, and the access state of the Buck-Boost circuit 11 is detected again until it is determined that the access state indicates that the photovoltaic panel or the energy storage battery is connected, and the steps of the foregoing embodiments are executed.

Since the Buck-Boost circuit 11 is idle with fewer access input devices. For example, 5 Buck-Boost circuits 11 are preset, but only 1 Buck-Boost circuit 11 is connected with the energy storage battery currently, and at this time, 4 Buck-Boost circuits 11 are idle, so that the problem of low utilization rate of the Buck-Boost circuits 11 is caused.

Referring to fig. 3, in one embodiment, a photovoltaic panel or energy storage cell is electrically connected to the input of one or more Buck-Boost circuits 11.

In this embodiment, a photovoltaic panel or an energy storage battery may be electrically connected to the input end of one or more Buck-Boost circuits 11, where a photovoltaic panel is connected to one Buck-Boost circuit 11, and there are often problems of larger circuit heating value and large current ripple during high-power operation, and if one photovoltaic panel is connected in parallel with the plurality of Buck-Boost circuits 11, the plurality of Buck-Boost circuits 11 may be subjected to staggered complementary control, so as to reduce current ripple and heating value; and the Buck-Boost circuit 11 can be connected with different photovoltaic panels or energy storage batteries, for example, when a plurality of batteries are connected into different Buck-Boost circuits 11, the Buck-Boost control is performed according to different energy storage batteries of each Buck-Boost circuit 11, so that the purpose of expanding the storage capacity of a DC side is achieved, and the battery can be compatible with different types of batteries.

In one embodiment, the first power switching transistor IGBT1 and the second power switching transistor IGBT2 are insulated gate bipolar transistors or MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistors).

Referring to fig. 4, the present application further provides an inverter, which includes a bus capacitor, a main control module 2, and the input circuit 1 according to any of the foregoing embodiments;

Each Buck-Boost circuit 11 in the input circuit 1 is connected with a bus capacitor in parallel, the bus capacitor is connected with the main control module 2 in parallel, and the main control module 2 is used for being electrically connected with load equipment.

In one embodiment, the inverter further comprises a filter circuit, an input end of the filter circuit is electrically connected with the main control module 2, and an output end of the filter circuit is used for being electrically connected with the load equipment.

In the embodiment, a plurality of Buck-Boost circuits 11 in the input circuit 1 are connected in parallel to a bus capacitor, so that the inverter can be used for randomly connecting different numbers of photovoltaic panels and energy storage batteries according to requirements through the input circuit 1; and the user can input instructions through the control model according to the requirements, and the action of connecting a plurality of photovoltaic panels and a plurality of energy storage batteries is determined through the input instructions.

Referring to fig. 5, in the implementation:

1. When the input instruction selects 0-path MPPT and 5-path buck-boost modes, the DC side of the photovoltaic energy storage inverter can select 5-path photovoltaic energy storage batteries for access, and the modes have no access of the photovoltaic panel, so that only the energy storage batteries interact with the alternating current side of the inverter. After 5 batteries are selected to be connected, the control mode of the batteries is determined according to the number of the input photovoltaic energy storage batteries, when only 1 battery is used, one battery can be connected to the input of a plurality of buck-boost circuits, the method can reduce the current of a single buck-boost circuit, so that the purposes of shunting the battery current and reducing the temperature rise of an inversion system are achieved, the running stability and safety of a machine are ensured, and in addition, when 1 battery is connected in multiple ways, software can carry out staggered complementary control on the buck-boost circuits, so that current ripple is reduced; when a plurality of batteries are connected, the energy storage batteries can be connected to different input ends of the DC input side, the system can perform voltage boosting and reducing control according to different input batteries of each voltage boosting and reducing circuit, and therefore the purpose of expanding the storage capacity of the DC side is achieved, and the system is compatible with batteries of different types.

2. When the input instruction selects a mode of 1-path MPPT and 4-path buck-boost, the DC side of the photovoltaic energy storage inverter can be connected with 1-path photovoltaic panel and 4-path energy storage battery, and when the input power of the photovoltaic panel side is smaller, the mode can be selected, and the mode supports the input of the low-power photovoltaic panel and the input and output of the battery with larger power. The photovoltaic panel may be selectively charged to the battery or grid-connected with the battery or discharged to the load. In the mode, the photovoltaic panel side adopts an independent MPPT control mode, the battery side determines the control mode of the battery according to the number of the input energy storage batteries, when only 1 battery is used, one battery can be selectively connected into the input of a plurality of voltage boosting and reducing circuits, the method can reduce the current of the single-channel voltage boosting and reducing circuit, the purposes of battery current splitting and inverter system temperature rise are achieved, and the stability and safety of machine operation are ensured. In addition, when a battery is connected in a multi-way mode, software can carry out staggered complementary control on the step-up and step-down circuit, so that current ripple waves are reduced; when a plurality of batteries are connected, the batteries can be connected to different input ends of the input side, the system can perform voltage increasing and decreasing control according to different input batteries of each voltage increasing and decreasing circuit, so that the purpose of expanding the storage capacity of the DC side is achieved, and the system is compatible with batteries of different types.

3. When the input instruction selects 2 paths of MPPT,3 paths of buck-boost or 3 paths of MPPT and 2 paths of buck-boost modes, the DC side of the photovoltaic energy storage inverter can be selectively connected with 2 paths of photovoltaic panels, 3 paths of energy storage batteries or 3 paths of photovoltaic panels and 2 paths of photovoltaic energy storage batteries. In the mode, the machine is connected with the photovoltaic panel and the battery in a normal mode as the ordinary photovoltaic energy storage inverter. The photovoltaic panel may be selectively charged to the battery or grid-connected with the battery or discharged to the load. In the mode, the battery side determines the control mode of the batteries according to the number of the input photovoltaic energy storage batteries, when only 1 battery is used, one battery can be selectively connected into the input of a plurality of buck-boost circuits, the method can reduce the current of a single-channel buck-boost circuit, so that the purposes of shunting the battery current and reducing the temperature rise of an inversion system are achieved, the running stability and safety of a machine are ensured, and in addition, when 1 battery is connected in multiple ways, software can carry out staggered complementary control on the buck-boost circuits, so that the current ripple is reduced; when a plurality of batteries are connected, the batteries can be connected to different input ends of the input side, the system can perform voltage increasing and decreasing control according to different input batteries of each voltage increasing and decreasing circuit, so that the purpose of expanding the storage capacity of the DC side is achieved, and the system is compatible with batteries of different types. In addition, as the photovoltaic panel is input in multiple ways, the design can select one photovoltaic module to be connected with different MPPT circuits, so that the current density of the circuit at the side of the photovoltaic panel is reduced, and the stability at the side of the photovoltaic panel is enhanced; multiple photovoltaic modules can be connected into different MPPT circuits, each MPPT is independently controlled, and wide power range input of the photovoltaic panel side is achieved.

4. When the input instruction selects 4 MPPT (maximum power point tracking) and 1 step-up and step-down modes, the DC side of the photovoltaic energy storage inverter can be selectively connected with 4 photovoltaic panels and 1 energy storage battery, and when the input and output power of the battery side is smaller, the mode can be selected, and the mode supports the input and output of the battery with low power and the input of the photovoltaic panels with high power. The multiple photovoltaic panels can be connected to charge the battery when the solar energy is sufficient, or be connected to the grid together with the battery or discharge the load. In the mode, as the photovoltaic panel is in multi-path input, the design can select one photovoltaic module to be connected with different MPPT circuits so as to reduce the current density of the circuit at the side of the photovoltaic panel and enhance the stability at the side of the photovoltaic panel; multiple photovoltaic modules can be connected into different MPPT circuits, each MPPT is independently controlled, and wide power input of the photovoltaic panel side is achieved. The high-power grid connection of the photovoltaic panel can realize high-power grid connection of the inverter, and more solar energy can be transmitted to a power grid or a load end, so that benefits are obtained.

5. When the input instruction selects a mode of 5 MPPT and 0 step-up and step-down, the DC side of the photovoltaic energy storage inverter can be selectively connected with 5 photovoltaic panels, and the mode is not connected with an energy storage battery, so that only the photovoltaic panels have the function of discharging to the grid, and the function of the mode is similar to that of the grid-connected inverter. Because the photovoltaic panel is input in multiple ways, the design can select one photovoltaic module to be connected with different MPPT circuits, so that the current density of the circuit at the side of the photovoltaic panel is reduced, and the stability at the side of the photovoltaic panel is enhanced; multiple photovoltaic modules can be connected into different MPPT circuits, each MPPT is independently controlled, and wide power input of the photovoltaic panel side is achieved. In the mode, because no photovoltaic energy storage battery exists, the power of the photovoltaic panel side is completely output to the mains supply end, the high-power grid connection of the inverter can be realized by high-power access of the photovoltaic panel, and more solar energy can be transmitted to the power grid or the load end, so that benefits are obtained.

The application also provides electronic equipment comprising the inverter provided by the embodiment. The electronic device may be a power system, a power conversion system, or the like.

The above description is illustrative of the various embodiments of the application and is not intended to be limiting, but is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims

1. An input circuit, wherein the input circuit comprises at least two Buck-Boost circuits;

2. The input circuit of claim 1, wherein the Buck-Boost circuit comprises a first capacitor, a second capacitor, a first inductor, a first power switch, a second power switch;

3. The input circuit of claim 1, wherein one of the photovoltaic panels or energy storage cells is electrically connected to an input of one or more of the Buck-Boost circuits.

4. The input circuit of claim 2, wherein the first power switch tube and the second power switch tube are insulated gate bipolar transistors or MOSFETs.

5. The input circuit of claim 1, wherein the photovoltaic mode is a maximum power point tracking mode and the energy storage battery mode is a buck-boost mode.

6. An inverter, comprising a bus capacitor, a main control module and an input circuit according to any one of claims 1-5;

7. The inverter of claim 6, further comprising a filter circuit having an input electrically coupled to the main control module and an output electrically coupled to the load device.

8. An electronic device comprising the inverter according to claim 6 or 7.