A hybrid inverter, charging pile and power supply system

Abstract

The utility model discloses a kind of hybrid inverter, charging pile and power supply system, by including power board and shell, and AC / DC conversion module, DC / DC conversion module and BOOST module are set on power board, DC / DC inductance, BOOST inductance and inverter inductance are set on shell, to inductance and main power device realize space isolation and thermal decoupling, effectively avoid thermal coupling;At the same time, different inductance formation area type distribution on shell, effectively avoid heat piling up phenomenon.In addition, by integrating switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module and control module in the same topology, the unified energy channel of photovoltaic-dc bus-battery-ac side is constructed, control module drives switching switch to be quickly and reliably switched between grid-connected and off-grid two working conditions as needed.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a hybrid inverter, charging pile and power supply system. Background Technology

[0002] With the development of new energy technologies, hybrid inverters, as core equipment for achieving efficient bidirectional energy flow between photovoltaic power generation, energy storage systems, and the power grid, are widely used in distributed energy systems. These devices typically integrate multiple sub-circuits, including AC / DC conversion modules, DC / DC conversion modules, boost circuits, inverter circuits, grid-connected / off-grid switching circuits, and control modules, and are equipped with multiple high-frequency power inductors to achieve energy conversion and control under different operating modes.

[0003] In existing technologies, hybrid inverters, due to their compact structure and high internal integration, generate significant heat during continuous operation from multiple high-power-density modules. This is especially true for high-power paths such as the BOOST boost circuit, inverter bridge circuit, and DC / DC converter module, where core power devices and inductors are the main heat sources. If the inductors, capacitors, and main power devices are not arranged properly, heat will be concentrated and difficult to dissipate, easily leading to problems such as device overheating, severe thermal coupling, and insufficient electrical isolation, thus affecting the overall efficiency and reliability of the system.

[0004] In addition, in traditional hybrid inverters, power devices and inductors are usually mounted on the same plane, the heat dissipation channel is not clear, and the air cooling path cannot effectively cover the high heat area, resulting in limited power density of the whole machine, making it difficult to meet the engineering requirements of high energy efficiency and high reliability. Utility Model Content

[0005] The main objective of this invention is to provide a hybrid inverter, charging pile, and power supply system to at least solve the technical problems mentioned in the related technologies.

[0006] To achieve the above objectives, a first aspect of this utility model provides a hybrid inverter, the hybrid inverter comprising a housing and a power board located inside the housing; The power board is equipped with an AC / DC conversion module, a DC / DC conversion module and a BOOST module, and the housing is equipped with a DC / DC inductor, a BOOST inductor and an inverter inductor; The AC / DC conversion module is electrically connected to the inverter inductor, the DC / DC conversion module is electrically connected to the DC / DC inductor, and the BOOST module is electrically connected to the BOOST inductor. The DC / DC inductor is located on one side of the housing, while the inverter inductor and the BOOST inductor are located on the other side of the housing.

[0007] A second aspect of this utility model provides a charging pile, including a charging pile body and a hybrid inverter as described in the first aspect, wherein the hybrid inverter is built into the charging pile body.

[0008] A third aspect of this utility model provides a power supply system, including a power grid, an AC load, an energy storage battery, a photovoltaic module, and a hybrid inverter as described in the first aspect; the hybrid inverter is electrically connected to the power grid, the AC load, the energy storage battery, and the photovoltaic module respectively.

[0009] The hybrid inverter, charging pile, and power supply system of this utility model include a power board and a housing. The AC / DC conversion module, DC / DC conversion module, and BOOST module are set on the power board, while the DC / DC inductor, BOOST inductor, and inverter inductor are set on the housing. This achieves spatial isolation and thermal decoupling between the inductors and the main power devices, effectively avoiding thermal coupling. At the same time, the different inductors on the housing are distributed in a regional manner, effectively avoiding the phenomenon of heat accumulation. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies 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.

[0011] Figure 1 This is a schematic diagram illustrating the application scenario of the hybrid inverter provided in the embodiments of this application; Figure 2 This is a schematic diagram showing the distribution of each inductor in the housing in an embodiment of this application; Figure 3 This is a schematic diagram showing the distribution of each power module on the power board in an embodiment of this application; Figure 4 This is a schematic diagram of a hybrid inverter provided in an embodiment of this application.

[0012] Figure label: 1 — Housing; 2 — Power board; 10 — Changeover switch; 20 — AC / DC converter module; 30 — DC / DC converter module; 40 — BOOST boost module; 60 — DC / DC inductor; 70 — Inverter inductor; 80 — BOOST inductor. Detailed Implementation

[0013] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0015] In the description of the embodiments of this application, 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. The term "multiple" means two or more, unless otherwise explicitly specified. The term "comprising" indicates the presence of the described feature, whole, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or sets thereof. The term "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B may include three cases: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0016] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art; the terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0017] Furthermore, terms such as "exemplary," "for example," and "optional" are used to indicate illustrative purposes. Any technical solution described by the above terms in the embodiments of this application should not be construed as being more preferred or advantageous than other technical solutions. Specifically, these terms are intended to present the relevant technical concepts in terms of specific implementation methods.

[0018] Please refer to the following in order. Figures 1 to 4This application provides a hybrid inverter, which mainly serves as an energy hub between photovoltaic modules, energy storage batteries, AC loads (DC loads), and the power grid. It is equipped with both DC and AC ports: the DC port is used to connect the energy storage battery and photovoltaic modules, while the AC port is used to connect to a single-phase power grid and off-grid loads. Through a control module, the power flow is uniformly managed, enabling various energy conversion methods under different operating conditions, such as photovoltaic power generation to the grid, photovoltaic charging of the battery, grid charging of the battery, battery discharging to the grid, and battery power supply to off-grid loads, thereby completing hybrid energy conversion in both grid-connected and off-grid scenarios.

[0019] The hybrid inverter includes a housing 1 and a power board 2. The components are described below: The power board 2 is located inside the housing 1 and is equipped with an AC / DC conversion module 20, a DC / DC conversion module 30 and a BOOST module 40, which are used to realize multi-stage conversion of input and output power; The housing 1 is provided with power inductors corresponding to the above power modules, including DC / DC inductor 60, BOOST inductor 80 and inverter inductor 70, which are used for energy coupling and filtering.

[0020] Specifically, AC / DC conversion module 20 is electrically connected to inverter inductor 70 and is used to convert AC power into DC power and output it through inverter inductor 70; DC / DC conversion module 30 is electrically connected to DC / DC inductor 60 and is used for voltage regulation at the battery end; BOOST module 40 is electrically connected to BOOST inductor 80 and is used to boost DC voltage to meet inverter or grid connection requirements.

[0021] Furthermore, the DC / DC inductor 60 is located on one side of the housing 1, while the inverter inductor 70 and the BOOST inductor 80 are located on the other side of the housing 1 opposite to the DC / DC inductor 60. This structural layout distributes power inductors with different functions on opposite sides of the housing 1, achieving heat source separation and preventing thermal coupling between different inductors. It also facilitates electromagnetic interference control and balanced heat distribution, thereby improving system stability and overall heat dissipation efficiency.

[0022] As can be seen, the hybrid inverter of this application includes a power board and a housing, and the AC / DC conversion module, DC / DC conversion module and BOOST module are disposed on the power board, while the DC / DC inductor, BOOST inductor and inverter inductor are disposed on the housing, thereby achieving spatial isolation and thermal decoupling between the inductors and the main power devices, effectively avoiding thermal coupling; at the same time, the different inductors on the housing are distributed in a regional manner, effectively avoiding the phenomenon of heat accumulation.

[0023] In an optional embodiment of this application, the DC / DC inductor 60, inverter inductor 70, and BOOST inductor 80 are arranged along the length of the housing 1. The DC / DC inductor 60 is located at one edge, and the inverter inductor 70 and BOOST inductor 80 are arranged side by side on the opposite side. Furthermore, the distance between the DC / DC inductor 60 and the inverter inductor 70 is equal to the distance between the DC / DC inductor 60 and the BOOST inductor 80 in the length direction. Preferably, this distance is set to more than half the length of the housing 1, thereby achieving a symmetrical distribution in the structure, forming an effective thermal equilibrium channel and spatial isolation area, further improving the system's heat dissipation capacity and electromagnetic interference suppression capability.

[0024] In an optional embodiment of this application, a control board 50 is also provided on the power board 2, and a changeover switch 10 is formed on the housing 1.

[0025] Specifically, when the hybrid inverter is running, the control board 50 controls the switching switch 10 to be turned on or off, thereby controlling the AC / DC conversion module 20 to be electrically connected to the grid or AC load, so that the hybrid inverter can switch between grid-connected operation mode and off-grid operation mode.

[0026] In an optional embodiment of this application, the AC / DC converter module 20 is electrically connected to the grid or an AC load via the switch 10; the AC / DC converter module 20 is also electrically connected to the energy storage battery via the DC / DC converter module 30; and the AC / DC converter module 20 is also electrically connected to the photovoltaic module via the BOOST module 40. The control board 50 is simultaneously electrically connected to the switch 10, the AC / DC converter module 20, the DC / DC converter module 30, and the BOOST module 40, outputting drive and control commands and acquiring necessary operating parameters such as voltage, current, and temperature.

[0027] It should be understood that the switching switch 10 can be an AC-side selector (e.g., a silicon carbide (SiC) MOSFET) that switches between the "grid-connected port (grid)" and the "off-grid port (AC load)" on the line, enabling the inverter to switch between grid-connected and off-grid operating modes. The AC / DC conversion module 20 can be an AC-DC bidirectional power conversion unit that, when grid-connected, controls the current supply / delivery to the grid according to the grid phase, and when off-grid, outputs a set frequency and voltage to supply power to the load and participates in maintaining the DC bus voltage. The DC / DC conversion module 30 can be a bidirectional DC-DC conversion unit connected to the energy storage battery, realizing battery charging / discharging and power direction and magnitude adjustment, and helping to maintain DC bus stability. The BOOST module 40 can be a photovoltaic-side boost and MPPT unit (one or more channels), which boosts the photovoltaic DC energy and connects it to the DC bus, and tracks the maximum power point under control. The control module 50 can be the system coordination and drive core (e.g., CPU), responsible for collecting signals such as voltage / current / temperature, controlling the grid connection / off-grid selection of the switching switch 10, and sending PWM / control commands to the AC / DC, DC / DC and BOOST modules to realize energy management and protection linkage between the ports.

[0028] The hybrid inverter in this embodiment has two operating modes: When the hybrid inverter is in grid-connected operation mode, the control board 50 transmits corresponding Relay Control signals (switch control signals), INV PWM signals (AC / DC control signals), DC PWM signals (DC / DC control signals), and Boost PWM signals (BOOST control signals) to the switching switch 10, AC / DC converter module 20, DC / DC converter module 30, and BOOST module 40. This controls the switching switch 10 to connect the grid-connected port and disconnect the off-grid port (i.e., the AC / DC converter module 20 is connected to the grid). This causes the AC / DC converter module 20 to operate in grid-connected current control mode, injecting / absorbing current into the grid according to the grid voltage phase and maintaining the DC bus voltage. The BOOST module 40 performs maximum power point tracking to send photovoltaic power into the DC bus, and the DC / DC converter module 30 charges and discharges the battery according to the battery state of charge to achieve power balance.

[0029] When the hybrid inverter is in off-grid operation mode, the control module 50 also transmits corresponding Relay Control signals (switching switch control signals), INV PWM signals (AC / DC control signals), DC PWM signals (DC / DC control signals), and Boost PWM signals (BOOST control signals) to the switching switch 10, AC / DC conversion module 20, DC / DC conversion module 30, and BOOST module 40. This controls the switching switch 10 to connect the off-grid port and disconnect the grid-connected port (i.e., the AC / DC conversion module 20 is connected to the AC load), so that the AC / DC conversion module operates in inverter voltage control mode, outputting AC power of a set frequency and amplitude to the AC load and maintaining the DC bus voltage; the BOOST module and the DC / DC conversion module work together to regulate the DC bus voltage and supply power to the AC load.

[0030] The hybrid inverter in this application integrates a switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module, and control module within the same topology, constructing a unified energy channel from photovoltaics to the DC bus, battery, and AC side. The control module drives the switching switch on demand to quickly and reliably switch between grid-connected and off-grid conditions: when the mains power is normal, it supports grid-connected photovoltaics / battery charging; when the mains power is abnormal, it seamlessly switches to battery power supply for off-grid loads. This structure makes the functional boundaries of each port clear and the power flow programmable, avoiding external switching and multi-machine cascading, reducing system complexity and wiring costs; at the same time, it facilitates the implementation of photovoltaic MPPT and bidirectional energy management of the battery, improving energy utilization and power supply continuity, and laying the system architecture foundation for subsequent increases in power density and reduction of filtering / heat dissipation scale.

[0031] It should be noted that the embodiments of this application focus on the circuit connection relationship of each functional unit and the systematic structure of the energy channel (including the switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module and the connection and coordination of the ports / buses connected thereto). Regarding the driving and scheduling strategies of the control module for the above-mentioned power units (such as grid-connected / off-grid switching logic, MPPT control, DC bus voltage regulation, battery charge / discharge limiting / current limiting, etc.), these are all conventional technical means that can be directly selected or equivalently replaced by those skilled in the art based on existing control theories and mature algorithms (such as PI / PR control, SVPWM / SPWM, disturbance observation / admittance incremental MPPT, SOC management, etc.). This application is not limited to specific control algorithms or parameters, but focuses on the unit connection relationship and energy flow organization method as the main protection content; the hardware and software implementation of the controller, algorithm details, and parameter tuning can all be equivalently modified without departing from the technical concept of this application.

[0032] In an optional embodiment of this application, the BOOST module includes a first BOOST submodule and a second BOOST submodule.

[0033] Specifically, the first terminal of the first BOOST submodule is electrically connected to the first terminal of the AC / DC conversion module 20, the first terminal of the second BOOST submodule, and the first terminal of the DC / DC conversion module 30. The second terminal of the first BOOST submodule is electrically connected to the second terminal of the second BOOST submodule and the second terminal of the DC / DC conversion module 30. The third terminal of the first BOOST submodule is used to be electrically connected to the photovoltaic module, and the third terminal of the second BOOST submodule is used to be electrically connected to the photovoltaic module.

[0034] This implementation uses two BOOST sub-modules to enable the two photovoltaic systems to be boosted by their respective voltages and then connected to the DC bus with capacitor C1 as the common coupling point. This facilitates the control module to perform MPPT on the two photovoltaic systems and supply power to the bus.

[0035] In an optional embodiment of this application, battery terminals are formed on the housing; the AC / DC conversion module is electrically connected to the battery terminals, which are used to electrically connect to the energy storage battery.

[0036] In an optional embodiment of this application, a communication terminal is also formed on the housing 1, which is used for electrical connection with a host computer.

[0037] Specifically, the host computer and control board 50 can communicate (via CAN, RS485 or Ethernet) for parameter configuration and distribution (grid-connected / off-grid strategies, power / voltage / current limits, MPPT and battery management parameters), real-time monitoring and display (voltage, current, power, temperature and event status of each port), data recording and export (operating curves, alarms and fault codes), remote maintenance (program / parameter upgrades, log feedback), and alarm linkage and historical tracing, thereby realizing centralized management and remote operation and maintenance of the hybrid inverter.

[0038] This application also provides a charging pile, including a charging pile body and a hybrid inverter as described in the above embodiments, wherein the hybrid inverter is built into the charging pile body.

[0039] This application also provides a power supply system, including a power grid, an AC load, an energy storage battery, a photovoltaic module, and a hybrid inverter as described in the above embodiments; the hybrid inverter is electrically connected to the power grid, the AC load, the energy storage battery, and the photovoltaic module respectively.

[0040] This invention discloses a hybrid inverter, charging pile, and power supply system. It includes a power board and a housing, with the AC / DC conversion module, DC / DC conversion module, and BOOST module mounted on the power board, and the DC / DC inductor, BOOST inductor, and inverter inductor mounted on the housing. This achieves spatial isolation and thermal decoupling between the inductors and the main power devices, effectively avoiding thermal coupling. Simultaneously, the different inductors on the housing are distributed in a regional manner, effectively preventing heat accumulation. Furthermore, by integrating a switching switch, AC / DC conversion module, DC / DC conversion module, BOOST module, and control module within the same topology, a unified energy channel is constructed from photovoltaic to DC bus to battery to AC side. The control module drives the switching switch to quickly and reliably switch between grid-connected and off-grid operating conditions as needed.

[0041] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A hybrid inverter, characterized in that, The hybrid inverter includes a housing and a power board located inside the housing; The power board is equipped with an AC / DC conversion module, a DC / DC conversion module and a BOOST module, and the housing is equipped with a DC / DC inductor, a BOOST inductor and an inverter inductor; The AC / DC conversion module is electrically connected to the inverter inductor, the DC / DC conversion module is electrically connected to the DC / DC inductor, and the BOOST module is electrically connected to the BOOST inductor. The DC / DC inductor is located on one side of the housing, while the inverter inductor and the BOOST inductor are located on the other side of the housing.

2. The hybrid inverter as described in claim 1, characterized in that, Along the length of the housing, the distance between the DC / DC inductor and the inverter inductor is equal to the distance between the DC / DC inductor and the BOOST inductor.

3. The hybrid inverter as described in claim 2, characterized in that, The distance is at least half the length of the shell.

4. The hybrid inverter as described in claim 1, characterized in that, The power board is also provided with a control board, and the housing forms a switching switch; The control board is used to control the switching switch so that the hybrid inverter switches between grid-connected operation mode and off-grid operation mode.

5. The hybrid inverter as described in claim 4, characterized in that, The AC / DC conversion module is used to be electrically connected to the power grid and the AC load respectively through the switching switch. The AC / DC conversion module is also used to be electrically connected to the energy storage battery through the DC / DC conversion module. The AC / DC conversion module is also used to be electrically connected to the photovoltaic module through the BOOST module. The control board is electrically connected to the switching switch, the AC / DC conversion module, the DC / DC conversion module and the BOOST module respectively.

6. The hybrid inverter as described in claim 5, characterized in that, Battery terminals are formed on the housing; The AC / DC converter module is electrically connected to the battery terminal, which is used to electrically connect to the energy storage battery.

7. The hybrid inverter as described in claim 5, characterized in that, The BOOST module includes a first BOOST submodule and a second BOOST submodule; The first terminal of the first BOOST submodule is electrically connected to the third terminal of the AC / DC conversion module, the first terminal of the second BOOST submodule, and the first terminal of the DC / DC conversion module. The second terminal of the first BOOST submodule is electrically connected to the second terminal of the second BOOST submodule and the second terminal of the DC / DC conversion module. The third terminal of the first BOOST submodule is used to be electrically connected to the photovoltaic module, and the third terminal of the second BOOST submodule is used to be electrically connected to the photovoltaic module.

8. The hybrid inverter as described in any one of claims 5 to 7, characterized in that, When the hybrid inverter is in grid-connected operation mode, the control board controls the switching switch to connect the grid-connected port and disconnect the off-grid port, so that the AC / DC conversion module operates in grid-connected current control mode, injecting / absorbing current into the grid according to the grid voltage phase and maintaining the DC bus voltage; the BOOST module performs maximum power point tracking to send photovoltaic power into the DC bus, and the DC / DC conversion module charges and discharges the battery according to the battery state of charge to achieve power balance; When the hybrid inverter is in off-grid operation mode, the control board controls the switching switch to connect the off-grid port and disconnect the grid-connected port, so that the AC / DC conversion module works in inverter voltage control mode, outputting AC power of set frequency and amplitude to the AC load and maintaining the DC bus voltage; the BOOST module and the DC / DC conversion module work together to stabilize the DC bus voltage and supply power to the AC load.

9. A charging pile, characterized in that, It includes a charging pile body and a hybrid inverter as described in any one of claims 1 to 8, wherein the hybrid inverter is built into the charging pile body.

10. A power supply system, characterized in that, Includes the power grid, AC load, energy storage battery, photovoltaic module, and hybrid inverter as described in any one of claims 1 to 8; The hybrid inverter is electrically connected to the power grid, AC load, energy storage battery, and photovoltaic module, respectively.

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