An inverter

Abstract

This utility model provides an inverter, including a BUCK step-down MPPT circuit module 100, a DC / DC push-pull boost circuit module, and a DC / AC inverter circuit module. The input terminal of the BUCK step-down MPPT circuit module is connected to a PV photovoltaic panel, and its output terminal is connected to an energy storage battery pack. The input terminal of the DC / DC push-pull boost circuit module is connected to the energy storage battery pack, and its output terminal is connected to the DC / AC inverter circuit module. The DC / AC inverter circuit module is connected to a load. In other words, the inverter of this application can meet stability requirements.

Description

Technical Field

[0001] This utility model belongs to the field of inverter technology, and more specifically, relates to an inverter. Background Technology

[0002] Current inverter technology relies on the high-frequency switching action of power electronic devices, along with energy storage components and control algorithms, for power conversion and distribution. However, the output stability of current inverters is relatively poor. Faced with sudden load changes, inverters need to adjust their output quickly. For example, with high-power inductive loads, inverters struggle to meet stability requirements. Utility Model Content

[0003] The present invention provides an inverter to solve at least one of the technical problems mentioned in the background section.

[0004] The technical solution adopted in this utility model is an inverter, including a BUCK step-down MPPT circuit module, a DC / DC push-pull boost circuit module, and a DC / AC inverter circuit module; wherein...

[0005] The input terminal of the BUCK step-down MPPT circuit module is connected to the PV photovoltaic panel, and the output terminal of the BUCK step-down MPPT circuit module is connected to the energy storage battery pack.

[0006] The input terminal of the DC / DC push-pull boost circuit module is connected to the energy storage battery pack, the output terminal of the DC / DC push-pull boost circuit module is connected to the DC / AC inverter circuit module, and the DC / AC inverter circuit module is connected to the load.

[0007] In other words, in the inverter of this application, by setting a BUCK step-down MPPT circuit module between the PV photovoltaic panel and the energy storage battery pack, the PV photovoltaic panel always outputs maximum power under different light or load conditions, while realizing the voltage step-down function, so that the stepped-down electrical energy enters the energy storage battery pack for storage, improving the energy storage efficiency and serving as the basis for ensuring a stable voltage supply. Then, a DC / DC push-pull boost circuit module is set between the energy storage battery pack and the DC / AC inverter circuit module. The DC / DC push-pull boost circuit module is used to boost the low-voltage DC of the energy storage battery pack to the high-voltage DC bus, providing a stable high-voltage DC voltage for the subsequent inverter stage. The DC / AC circuit module can invert the high-voltage DC bus voltage into controllable AC power through power electronic switching devices, which can directly drive motors or provide a suitable and stable AC power supply for loads such as household appliances. This structure enables the inverter to meet the stability requirements.

[0008] As a preferred embodiment of this utility model, it also includes a PFC circuit module, one end of which is connected to the mains power and the other end of which is connected to a DC / AC inverter circuit module.

[0009] As a preferred embodiment of this utility model, it further includes a control panel, an MCU module, and a detection circuit. The control panel is connected to the MCU module, and the MCU module is connected to the DC / DC push-pull boost circuit module and the PFC circuit module respectively. The MCU module is used to adjust the output voltage of the DC / DC push-pull boost circuit module and the PFC circuit module.

[0010] The detection circuit is connected to the MCU module, the PFC circuit module, and the DC / DC push-pull boost circuit module, respectively.

[0011] As a preferred embodiment of this utility model, it also includes a priority control module, through which the MCU module is connected to the DC / DC push-pull boost circuit module and the PFC circuit module respectively. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A structural block diagram of an inverter according to the first embodiment of this utility model;

[0014] Figure 2 A schematic diagram of photovoltaic charging in an inverter provided by this utility model;

[0015] Figure 3 A schematic diagram of mains charging in an inverter provided by this utility model;

[0016] Figure 4 This is a structural block diagram of an inverter according to a second embodiment of the present invention.

[0017] Figure label:

[0018] 100. PV photovoltaic panel; 200. BUCK step-down MPPT circuit module; 300. Energy storage battery pack; 400. DC / DC push-pull boost circuit module; 500. DC / AC inverter circuit module; 600. Load; 700. Mains power; 800. PFC circuit module; 900. Control panel; 1000. MCU module; 1100. Detection circuit; 1200. Priority control module. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In some descriptions of utility models, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] This application provides an inverter for converting electrical energy generated by a PV photovoltaic panel 100 into power that can supply power to a load 600, and the power supply voltage is stable.

[0024] See Figure 1 and Figure 2 The inverter may include a buck MPPT circuit module 100, a DC / DC push-pull boost circuit module 400, and a DC / AC inverter circuit module 500. The input of the buck MPPT circuit module 100 is connected to the PV photovoltaic panel 100, and its output is connected to the energy storage battery pack 300. The input of the DC / DC push-pull boost circuit module 400 is connected to the energy storage battery pack 300, and its output is connected to the DC / AC inverter circuit module 500. The DC / AC inverter circuit module 500 is connected to a load 600.

[0025] Understandably, the BUCK buck MPPT circuit module 100 combines the BUCK buck circuit and maximum power point tracking (MPPT) technology. Its core function is to dynamically adjust the circuit parameters so that the PV photovoltaic panel 100 always outputs maximum power under different light or load conditions, while also realizing the voltage buck function so that the bucked electrical energy can be stored in the energy storage battery pack 300.

[0026] The DC / DC push-pull boost circuit module 400 is a switching power supply circuit based on a push-pull topology. Its core function is to boost the input voltage to a higher, more stable output voltage by alternately controlling the magnetic energy conversion of the power switching transistor and the transformer. The DC / DC push-pull boost circuit module 400 uses a push-pull topology and a high-frequency transformer to achieve electrical isolation and voltage matching, suppressing common-mode interference. The DC / DC push-pull boost circuit module 400 is used to boost the low-voltage DC of the energy storage battery pack 300 to the high-voltage DC bus, providing a stable high-voltage DC voltage for the subsequent inverter stage.

[0027] The DC / AC circuit module uses power electronic switching devices to invert the high-voltage DC bus voltage into controllable AC power. Its output can directly drive motors or provide suitable AC power for loads such as household appliances.

[0028] In other words, in the inverter of this application, by setting a BUCK step-down MPPT circuit module 100 between the PV photovoltaic panel 100 and the energy storage battery pack 300, the PV photovoltaic panel 100 always outputs maximum power under different light conditions or loads 600, while realizing the voltage step-down function, so that the stepped-down electrical energy enters the energy storage battery pack 300 for storage, improving the energy storage efficiency and serving as the basis for ensuring a stable voltage supply. Then, a DC / DC push-pull boost circuit module 400 is set between the energy storage battery pack 300 and the DC / AC inverter circuit module 500. The DC / DC push-pull boost circuit module 400 is used to boost the low-voltage DC of the energy storage battery pack 300 to the high-voltage DC bus, providing a stable high-voltage DC voltage for the subsequent inverter stage. The DC / AC circuit module can invert the high-voltage DC bus voltage into controllable AC power through power electronic switching devices, which can directly drive motors or provide a suitable and stable AC power supply for loads 600 such as household appliances. This structure enables the inverter to meet the stability requirements.

[0029] Further, see Figure 1 and Figure 3 The inverter may also include a PFC circuit module 800, one end of which is connected to the mains power 700, and the other end of which is connected to the DC / AC inverter circuit module 500.

[0030] Specifically, the mains power 700 is converted into stable high-voltage DC by the PFC circuit module 800 and supplied to the DC bus, giving it the function of mains power 700. When the energy storage battery pack 300 is insufficient, the PFC circuit module 800 will automatically switch to DC bus power supply to achieve seamless switching and avoid voltage fluctuations in the load 600.

[0031] As can be understood, in the above structure, the energy storage battery pack 300 is powered by both the DC / DC push-pull boost circuit module 400 and the mains power 700 to the DC bus. When the energy storage battery pack 300 is insufficient, the voltage output by the energy storage battery pack 300 is lower than the mains power 700 voltage. Therefore, the mains power 700 can directly supply power to the load 600 through the PFC circuit module 800 and the DC / AC inverter circuit module 500. This method utilizes the circuit principle of current flowing from a high potential (voltage) to a low potential.

[0032] See Figure 4 In one embodiment, the inverter may further include a control panel 900, an MCU module 1000, and a detection circuit 1100. The control panel 900 is connected to the MCU module 1000, which is connected to both a DC / DC push-pull boost circuit module 400 and a PFC circuit module 800. The MCU module 1000 is used to adjust the output voltages of the DC / DC push-pull boost circuit module 400 and the PFC circuit module 800. The detection circuit 1100 is connected to the MCU module 1000, the PFC circuit module 800, and the DC / DC push-pull boost circuit module 400.

[0033] Understandably, the detection circuit 1100 can detect the output voltage of the PFC circuit module 800 and the DC / DC push-pull boost circuit module 400 in real time. The user can obtain the output voltage of the PFC circuit module 800 and the DC / DC push-pull boost circuit module 400 fed back by the detection circuit 1100 through the MCU module 1000, and can adjust the output voltage of the PFC circuit module 800 and the DC / DC push-pull boost circuit module 400 respectively through the control panel 900 to control the MCU module 1000.

[0034] For example, when the inverter prioritizes photovoltaic power supply, based on the circuit principle that current flows from high potential (voltage) to low potential, the output voltage of the DC / DC push-pull boost circuit module 400 can be made higher than the output voltage of the PFC circuit module 800 by the MCU module 1000.

[0035] When the inverter prioritizes AC 700V power supply, based on the circuit principle that current flows from high potential (voltage) to low potential, the output voltage of the PFC circuit module 800 can be made higher than the output voltage of the DC / DC push-pull boost circuit module 400 through the MCU module 1000.

[0036] In one specific embodiment, in order to facilitate the MCU module 1000 to adjust the output voltage of the PFC circuit module 800 and the DC / DC push-pull boost circuit module 400, the inverter may also include a priority control module 1200. The MCU module 1000 is connected to the DC / DC push-pull boost circuit module 400 and the PFC circuit module 800 respectively through the priority control module 1200.

[0037] Specifically, when photovoltaic power supply is prioritized, the energy flow path is as follows: Figure 2 The low-voltage DC power from the energy storage battery pack 300 is boosted by the DC / DC push-pull boost circuit module 400 to the high-voltage DC bus, and then inverted into controllable AC power by the DC / AC circuit module to supply power to the load 600. When the energy storage battery pack 300 is insufficient, it will seamlessly switch to mains power 700. The energy flow path is as follows: Figure 3 The AC mains power 700 is converted into stable high-voltage DC power by the PFC circuit module 800 to supply the DC bus, and then inverted into controllable AC power by the DC / AC circuit module to power the load 600. When the energy storage battery pack 300 has sufficient power, the inverter will seamlessly switch back to power supply from the energy storage battery pack 300.

[0038] When prioritizing 700kΩ mains power, the energy flow path is as follows: Figure 3 The mains power 700 is converted into stable high-voltage DC power by the PFC circuit module 800 to supply the DC bus, and then inverted into controllable AC power by the DC / AC inverter circuit module 500 to power the load 600. When the mains power 700 fails, it will seamlessly switch to the energy storage battery pack 300 for power supply. The energy flow path is as follows: Figure 2 The low-voltage DC power from the energy storage battery pack 300 is boosted by the DC / DC push-pull boost circuit module 400 and then fed to the high-voltage DC bus. It is then inverted by the DC / AC inverter circuit module 500 into controllable AC power to supply the load 600. When the mains power 700 is normal, the inverter will seamlessly switch back to normal mains power supply.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of some utility models should be included within the protection scope of some utility models.

Claims

1. An inverter, characterized by comprising: This includes a BUCK step-down MPPT circuit module, a DC / DC push-pull boost circuit module, and a DC / AC inverter circuit module; among which, The input terminal of the BUCK step-down MPPT circuit module is connected to the PV photovoltaic panel, and the output terminal of the BUCK step-down MPPT circuit module is connected to the energy storage battery pack. The input terminal of the DC / DC push-pull boost circuit module is connected to the energy storage battery pack, the output terminal of the DC / DC push-pull boost circuit module is connected to the DC / AC inverter circuit module, and the DC / AC inverter circuit module is connected to the load.

2. The inverter of claim 1, wherein, It also includes a PFC circuit module, one end of which is connected to the mains power and the other end of which is connected to a DC / AC inverter circuit module.

3. The inverter of claim 1, wherein, It also includes a control panel, an MCU module, and a detection circuit. The control panel is connected to the MCU module, and the MCU module is connected to the DC / DC push-pull boost circuit module and the PFC circuit module respectively. The MCU module is used to adjust the output voltage of the DC / DC push-pull boost circuit module and the PFC circuit module. The detection circuit is connected to the MCU module, the PFC circuit module, and the DC / DC push-pull boost circuit module, respectively.

4. The inverter of claim 3, wherein, It also includes a priority control module, through which the MCU module is connected to the DC / DC push-pull boost circuit module and the PFC circuit module respectively.

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