inverter

Abstract

Provided in the present application is an inverter, which inverter comprises an inverter circuit module and a printed circuit board (PCB). The inverter circuit module forms an inverter circuit by means of traces on the PCB, wherein a first end of the inverter circuit is used for being connected to a direct-current power supply, and a second end of the inverter circuit is used for being connected to an alternating-current power grid and / or a load. The inverter circuit module comprises a plurality of inverter bridge arm modules and a plurality of filter capacitor modules, wherein each inverter bridge arm module comprises at least four switching transistors, and each filter capacitor module comprises at least one capacitor. The plurality of filter capacitor modules are sequentially arranged on the PCB in a first direction, and at least one inverter bridge arm module is arranged between any two filter capacitor modules. The inverter provided in the present application can enhance the suppression effect of voltage spikes in switching transistors in an inverter bridge arm module.

Description

An inverter

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on January 10, 2024, with application number 202410046690.8 and application name “A Type of Inverter”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of power electronics, and in particular to an inverter. Background Art

[0003] With the rapid development of industries such as energy and photovoltaics, the power of high-power inverters has been continuously improved, which has put forward new requirements for existing inverters. The parasitic inductance parameters of the power modules of most existing commercial inverters are relatively large, which makes the switch tube withstand a large spike voltage when shutting down at high speed, and produces large oscillations in the switching transient. In order to meet the requirements of voltage stress derating, decoupling capacitors are usually set to absorb the voltage spikes of the switch tube and thus reduce the voltage stress. However, the switch tube and the decoupling capacitor are generally arranged in different areas, which increases the wiring distance connecting the switch tube and the decoupling capacitor (as shown in Figure 3, the connection between the switch tube in the bridge arm 311 and the corresponding decoupling capacitor 321 requires a longer lead distance), thereby reducing the decoupling capacitor's absorption effect on the voltage spike of the switch tube. Summary of the Invention

[0004] The present application provides an inverter that can improve the absorption effect of voltage spikes of switch tubes in an inverter bridge arm module.

[0005] In a first aspect, the present application provides an inverter. The inverter provided by the present application includes an inverter circuit module and a printed circuit board (PCB). The inverter circuit module forms an inverter circuit through the wiring on the PCB. The first end of the inverter circuit is used to connect to a DC power supply, and the second end of the inverter circuit is used to connect to an AC power grid and / or a load. The inverter circuit module includes multiple inverter bridge arm modules and multiple filter capacitor modules. The inverter bridge arm module includes at least 4 switching tubes, and the filter capacitor module includes at least 1 capacitor. The multiple filter capacitor modules are arranged on the PCB in sequence along a first direction, and at least one inverter bridge arm module is arranged between any two filter capacitor modules.

[0006] The inverter provided in the embodiment of the present application can shorten the wiring distance between the inverter bridge arm module and the filter capacitor module by setting the inverter bridge arm module between any two filter capacitor modules, thereby reducing the parasitic inductance on the wiring between the inverter bridge arm module and the filter capacitor module, and further improving the filter capacitor module's absorption effect on the voltage spike of the switching tube in the inverter bridge arm module.

[0007] It should be understood that the structure of the inverter provided in the embodiment of the present application can be applicable to equipment with power conversion functions, such as photovoltaic inverters, power storage converters (power conversion systems, PCS) and other inverter devices, and the embodiment of the present application does not limit this.

[0008] Specifically, the switching tubes of the inverter bridge arm module include metal oxide semiconductor field effect transistors MOSFET, insulated gate bipolar transistors IGBT, etc.

[0009] In combination with the first aspect, in some implementations of the first aspect, the number of the multiple filter capacitor modules is one more than the number of the multiple inverter bridge arm modules, and the multiple filter capacitor modules and the multiple inverter bridge arm modules are alternately arranged in sequence along the first direction.

[0010] The inverter provided in the embodiment of the present application, by alternately arranging multiple filter capacitor modules and multiple inverter bridge arm modules in sequence, and making the number of multiple filter capacitor modules one more than the number of multiple inverter bridge arm modules, can make each inverter bridge arm module have corresponding filter capacitor modules on both sides, thereby improving the filter capacitor module's absorption effect on the voltage spike generated when the switch tube in the inverter bridge arm module is quickly turned off.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the filter capacitor module includes a first capacitor unit, and the inverter bridge arm module includes two first switching tubes and two second switching tubes. The first capacitor units of the multiple filter capacitor modules are equidistantly distributed along a first distribution straight line along a first direction. The two first switching tubes of the inverter bridge arm module and the first capacitor units of two adjacent filter capacitor modules are equidistantly distributed along the first direction, and the two second switching tubes of the inverter bridge arm module and the first capacitor units of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The two first switching tubes and the two second switching tubes are symmetrically distributed along the first distribution straight line.

[0012] The inverter provided in the embodiment of the present application is capable of providing the same decoupling effect to the inverter bridge arm module by distributing the first capacitor units of the plurality of filter capacitor modules at equal distances, and distributing some of the switch tubes of the inverter bridge arm module at equal distances from the first capacitor units of the two adjacent filter capacitor modules. On the other hand, the symmetrical distribution of some of the switch tubes of the inverter bridge arm module and another part of the switch tubes along the distribution line of the plurality of filter capacitor modules can reduce the space occupied by the plurality of switch tubes of the inverter bridge arm module in the first direction, thereby shortening the wiring distance between the two adjacent filter capacitor modules and the plurality of switch tubes in the inverter bridge arm module, thereby reducing the parasitic inductance on the wiring between the switch tube of the inverter bridge arm module and the corresponding filter capacitor module, and improving the absorption effect of the voltage spike of the switch tube in the inverter bridge arm module.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the first capacitor unit includes a first capacitor, the two first switching tubes of the inverter bridge arm module and the first capacitors of the two adjacent filter capacitor modules are equidistantly distributed along the first direction, and the two second switching tubes of the inverter bridge arm module and the first capacitors of the two adjacent filter capacitor modules are equidistantly distributed along the first direction. The first capacitor includes an upper boundary and a lower boundary along the second direction, the upper boundary and the lower boundary of the first capacitor are parallel to the first distribution straight line, and at least a portion of the inverter bridge arm module is located between extensions of the upper boundary and the lower boundary of the first capacitor, respectively, wherein the first direction is perpendicular to the second direction.

[0014] The inverter provided in the embodiment of the present application can further shorten the routing distance between multiple switching tubes in the inverter bridge arm module and the two adjacent filter capacitor modules by disposing at least a portion of the inverter bridge arm module between the extension lines of the upper boundary and the lower boundary of the first capacitor of two filter capacitor modules adjacent to the inverter bridge arm module. This can reduce the parasitic inductance on the routing between the switching tubes in the inverter bridge arm module and the filter capacitor module, and further improve the filter capacitor module's absorption effect on the voltage spike generated when the switching tube is quickly turned off.

[0015] Optionally, the upper boundaries of the first capacitors of the multiple filter capacitor modules are located on the first upper boundary line, the lower boundaries of the first capacitors of the multiple filter capacitor modules are located on the first lower boundary line, the first upper boundary line and the first lower boundary line are parallel to the first distribution straight line, and at least part of the inverter bridge arm module is located between the first upper boundary line and the first lower boundary line.

[0016] In combination with the first aspect, in certain implementations of the first aspect, each switch tube in the inverter bridge arm module includes a pin, and the pins of the two first switch tubes and the two second switch tubes are located between the extension lines of the upper boundary and the lower boundary of the first capacitor.

[0017] The inverter provided in an embodiment of the present application can further reduce the routing distance between the switch tube in the inverter bridge arm module and the filter capacitor module by setting the pin of the switch tube in the inverter bridge arm module within a specific range between the upper boundary and the lower boundary of the first capacitor of two adjacent filter capacitor modules.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the first capacitor unit includes a second capacitor and a third capacitor. The two first switching tubes of the inverter bridge arm module and the second capacitors of the two adjacent filter capacitor modules are equidistantly distributed along the first direction, and the two second switching tubes of the inverter bridge arm module and the third capacitors of the two adjacent filter capacitor modules are equidistantly distributed along the first direction. The second capacitor and the third capacitor respectively include an upper boundary and a lower boundary along the second direction, the upper boundary and the lower boundary of the second capacitor and the third capacitor are parallel to the first distribution straight line, at least part of the two first switching tubes are located between the extension lines of the upper boundary and the lower boundary of the second capacitor, and at least part of the two second switching tubes are located between the extension lines of the upper boundary and the lower boundary of the third capacitor, wherein the first direction is perpendicular to the second direction.

[0019] The inverter provided in an embodiment of the present application, for the two groups of switching tubes symmetrically distributed along the first distribution straight line in the inverter bridge arm module, can further reduce the routing distance between the switching tubes and the corresponding capacitors in the inverter bridge arm module by limiting at least a portion of one group of switching tubes between the extension lines of the upper and lower boundaries of the second capacitor, and limiting at least a portion of the other group of switching tubes between the extension lines of the upper and lower boundaries of the third capacitor.

[0020] Optionally, the upper boundary of the second capacitor of multiple filter capacitor modules is located on the second upper boundary line, the lower boundary of the second capacitor of multiple filter capacitor modules is located on the second lower boundary line, the upper boundary of the third capacitor of multiple filter capacitor modules is located on the third upper boundary line, the lower boundary of the third capacitor of multiple filter capacitor modules is located on the third lower boundary line, the second upper boundary line, the second lower boundary line, the third upper boundary line and the third lower boundary line are parallel to the first distribution straight line, wherein at least part of the inverter bridge arm module is located between the second upper boundary line and the third lower boundary line.

[0021] Specifically, at least parts of the two first switching tubes are located between the second upper boundary line and the second lower boundary line, and at least parts of the two second switching tubes are located between the third upper boundary line and the third lower boundary line.

[0022] In combination with the first aspect, in certain implementations of the first aspect, each switching tube in the inverter bridge arm module includes a pin, the pins of the two first switching tubes are located between the extension lines of the upper boundary and the lower boundary of the second capacitor, and the pins of the two second switching tubes are located between the extension lines of the upper boundary and the lower boundary of the third capacitor.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the capacitor in the filter capacitor module includes a first pin and a second pin respectively disposed at two ends of the capacitor, and the first pin and the second pin are arranged along the second direction.

[0024] The inverter provided in the embodiment of the present application can further reduce the distance between the two pins of the capacitor and the corresponding inverter bridge arm module by arranging the two pins of the capacitor at the two ends of the capacitor respectively along the second direction, so that the distance between the two pins of the capacitor and the corresponding inverter bridge arm module is the same.

[0025] In combination with the first aspect, in some implementations of the first aspect, the filter capacitor module includes multiple capacitors, and the multiple capacitors are connected in series, in parallel, or in a combination of series and parallel.

[0026] In combination with the first aspect, in some implementations of the first aspect, the capacitor is a thin film capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of a photovoltaic power generation system provided in this application.

[0028] FIG2 is a schematic diagram of a scenario of a power system provided in this application.

[0029] Figure 3 shows a wiring method for a traditional power module.

[0030] FIG4 is a schematic diagram of the layout of a circuit board 400 provided in this application.

[0031] FIG5 is a schematic diagram of the layout of a circuit board 500 provided in this application.

[0032] FIG6 is a schematic diagram of the layout of a circuit board 600 provided in this application.

[0033] FIG7 is a schematic circuit diagram of a photovoltaic inverter provided in this application.

[0034] FIG8 is a schematic circuit diagram of another photovoltaic inverter provided in this application.

[0035] FIG9 is a schematic diagram of a filter capacitor module circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solution in this application will be described below with reference to the accompanying drawings.

[0037] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0038] The terms "first", "second", "third", "fourth" and the like in this application (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. The size of the sequence number of each process below does not mean the order of execution, and the order of execution of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. For example, in the embodiment of the present application, words such as "110", "210", "220" are only marks made for the convenience of description, and are not intended to limit the device.

[0039] References to "some embodiments" and the like in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in some embodiments" and the like that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0040] The terms used in the embodiments of the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present disclosure. The singular forms "a" and "the" used in the embodiments of the present disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0041] It should be noted that in the embodiments of the present application, "connection" refers to electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, the connection between A and B can also be a direct connection between A and C, and C and B can be directly connected, with A and B connected through C.

[0042] First, the application scenarios of the present application are introduced. The inverter provided in the present application can be applied to a variety of application fields such as the energy storage power field, the photovoltaic power generation field, the new energy smart microgrid field, the power transmission and distribution field, etc. The structure of the inverter provided in the embodiment of the present application can be applied to equipment with power conversion functions, such as photovoltaic inverters, energy storage converters (power conversion system, PCS) and other inverter equipment. The inverter provided in the embodiment of the present application is suitable for different application scenarios, such as energy storage power supply scenarios, photovoltaic power supply scenarios, photovoltaic storage hybrid power supply scenarios, uninterruptible power supply (UPS) power supply scenarios, etc., and the embodiment of the present application does not limit this. The following is an explanation taking the energy storage power supply scenario and the photovoltaic power generation scenario as examples.

[0043] An embodiment of the present application provides a photovoltaic power generation system, as shown in Figure 1. The photovoltaic power generation system provided by the present application includes a photovoltaic panel, a controller, and an inverter provided by the present application. The photovoltaic panel is used to convert solar energy into direct current (DC) electricity, the inverter is used to convert DC electricity into alternating current (AC), and the controller is used to control the operation of the photovoltaic panel and the inverter.

[0044] The inverter provided in this application may be a photovoltaic inverter. The output port of the photovoltaic panel is connected to the input port of the photovoltaic inverter, and the output port of the photovoltaic inverter is used to connect to the input of the power grid. The photovoltaic panel is used to generate direct current (DC) power, and the photovoltaic inverter is used to invert the DC power and input the resulting AC power into the power grid.

[0045] It should be understood that a photovoltaic panel refers to a device that uses the photovoltaic effect of semiconductor materials under sunlight to directly convert solar energy into electrical energy. The above photovoltaic panel can be a photovoltaic module, and can also be called a photovoltaic array or solar panel.

[0046] In order to rectify the direct current generated by the photovoltaic panels, a rectifier can also be set in the photovoltaic power generation system. The rectifier is connected between the output port of the photovoltaic module and the input port of the photovoltaic inverter. The rectifier is used to rectify the direct current generated by the photovoltaic module and input the rectified direct current into the photovoltaic inverter.

[0047] It should be understood that in addition to the photovoltaic power generation system provided in this application, the structure of the inverter provided in this application can also be applied to other power conversion equipment for power generation or power conversion.

[0048] FIG2 is a schematic diagram of an energy storage and power supply scenario of the power system provided in this application.

[0049] See Figure 2, which is a schematic diagram of an application scenario of the power system provided by this application. In the energy storage power supply scenario, the power system may include an energy storage unit and at least one inverter provided by this application, wherein the inverter provided by this application may be an energy storage converter.

[0050] The energy storage unit is electrically connected to the load and / or the power grid via an energy storage converter. The input of the energy storage converter is connected to the energy storage unit, such as a battery string. The output of the energy storage converter is connected to the power grid or load, such as a household appliance.

[0051] Optionally, in the energy storage power supply scenario, multiple energy storage converters and multiple energy storage units may be included, wherein the input end of an energy storage converter is connected to an energy storage unit, and the input ends of multiple energy storage converters are connected in parallel. The energy storage unit here may include at least one battery cluster, and each battery cluster is connected in parallel. A battery cluster may be composed of multiple battery groups connected in series. The battery group may be a battery pack, and a battery pack may be composed of one or more battery cells (the voltage of the battery cell is usually between 2.5V and 4.2V) connected in series and parallel to form the smallest energy storage and management unit.

[0052] After the power system starts operating, the energy storage converter can invert the DC power in the energy storage unit connected to its input end into AC power, thereby supplying power to various types of electrical equipment such as the AC power grid or AC loads (such as household appliances).

[0053] In some embodiments, the power conversion circuit in the energy storage converter is a bidirectional conversion circuit that can realize the charging or discharging of the energy storage unit. The power conversion circuit is used to bidirectionally convert the direct current of the energy storage unit and the alternating current of the alternating current grid and / or load. For example, the power conversion circuit is used to convert the direct current of the energy storage unit into alternating current and transmit it to the load, where the load can be an electrical device. Alternatively, after converting the alternating current into direct current, the direct current is transmitted to the energy storage unit for storage.

[0054] With the rapid development of industries like energy and photovoltaics, the power of high-power inverters continues to increase, placing new demands on existing inverters. The power modules of most existing commercial inverters have high parasitic inductance parameters. This causes the switching transistors to experience large voltage spikes during high-speed shutdown, resulting in large oscillations during switching transients. To meet voltage stress derating requirements, decoupling capacitors are often installed to absorb voltage spikes from the switching transistors and reduce voltage stress. Decoupling capacitors are passive components used to reduce electromagnetic interference between different components. In mixed digital and analog circuits, decoupling capacitors prevent high-frequency signals from propagating from one area to another and provide necessary voltage regulation.

[0055] However, the switching tube and the decoupling capacitor are generally arranged in different areas, which increases the wiring distance between the switching tube and the decoupling capacitor (as shown in Figure 3, a longer lead distance is required to connect the switching tube in the bridge arm 311 and the corresponding decoupling capacitor 321). As the wiring distance increases, the parasitic inductance generated in the line itself becomes larger, thereby reducing the decoupling capacitor's absorption effect on the voltage spike of the switching tube.

[0056] Based on this, an embodiment of the present application provides an inverter that can improve the absorption effect of the voltage spike of the switch tube in the inverter bridge arm module.

[0057] The inverter provided in an embodiment of the present application includes an inverter circuit module and a printed circuit board (PCB). The inverter circuit module forms an inverter circuit through traces on the PCB. A first end of the inverter circuit is used to connect to a DC power supply, and a second end of the inverter circuit is used to connect to an AC power grid and / or a load.

[0058] It should be understood that the inverter provided herein can be a photovoltaic inverter in a photovoltaic system or an energy storage converter in an energy storage system. For example, when the inverter is a photovoltaic inverter, a first end of the inverter circuit can be connected to a DC input circuit at one end of a solar panel, and a second end of the inverter circuit can be connected to a load and / or an AC output circuit at one end of a power grid.

[0059] A PCB is a printed circuit board (PCB), which supports electronic components and serves as a carrier for their electrical connections. It supports and interconnects circuit elements. These electronic components include, but are not limited to, capacitors, inductors, resistors, processors, memory, antennas, and the like. Generally, a printed circuit board (PCB) with soldered electronic components is also referred to as a printed circuit board assembly (PCBA).

[0060] The electronic components carried by a printed circuit board (PCB) can form multiple functional modules to achieve corresponding functions. For example, an inverter circuit is used to convert DC power into AC power, and a rectifier circuit is used to convert AC power into DC power. The shape of the PCB can be designed based on the shape of the electronic device and the location and shape of the functional modules to be arranged within the electronic device.

[0061] In an embodiment of the present application, the inverter circuit module includes multiple inverter bridge arm modules and multiple filter capacitor modules. The inverter bridge arm modules include at least four switching transistors, and the filter capacitor module includes at least one capacitor. The multiple filter capacitor modules are sequentially arranged on the PCB along a first direction, with at least one inverter bridge arm module disposed between any two filter capacitor modules.

[0062] It should be understood that the inverter bridge arm module in the inverter circuit module may include an upper bridge arm and a lower bridge arm, each of which includes multiple switching transistors, for example, at least four switching transistors. The upper bridge arm and the lower bridge arm refer to two circuit branches consisting of switch pairs. In applications such as DC-AC conversion or AC-DC conversion, these two circuit branches are commonly referred to as "half-bridges," "full-bridges," or "three-phase bridges" and are used to control, regulate, and convert electrical energy. Specifically, the upper bridge arm generally includes an input terminal, an output terminal, and a switch pair, where the source of the switch pair is connected to a positive power supply or signal source, and the drain is connected to the load. The lower bridge arm has a similar structure, except that the drain of the switch pair is connected to a positive power supply or signal source, and the source is connected to the load. The inverter output waveform control and operation management are achieved by driving the upper and lower switch pairs.

[0063] In some embodiments, the capacitors in the filter capacitor module are thin film capacitors.

[0064] In some embodiments, electrical components such as the inverter bridge arm module, filter capacitor module, power inductor, and busbar capacitor mounted on a PCB can be connected to the PCB via pins. In a specific implementation, the pins can be made of copper or other conductive metal materials. In one possible implementation, the pins can be bent into various shapes to accommodate various assembly methods, such as plug-in mounting or surface mounting on a PCB.

[0065] Optionally, metal ultrasonic bonding technology is used to achieve atomic-level bonding between the ground pins of the electrical component and the metallization layer on the surface of the PCB.

[0066] The following describes in detail the possible structures and layouts of the inverter bridge arm module and the filter capacitor module on the PCB in the inverter according to the embodiment of the present application, using Figures 4 to 6. It should be understood that the examples in Figures 4 to 6 are merely intended to help those skilled in the art understand the embodiments of the present application, and are not intended to limit the embodiments of the present application to the specific structures or specific scenarios in Figures 4 to 6. Based on the examples provided, it is obvious that those skilled in the art can make various equivalent modifications or variations, and such modifications and variations also fall within the scope of the embodiments of the present application.

[0067] FIG4 is a schematic diagram of the layout of a circuit board 400 provided in this application.

[0068] As shown in Figure 4, a plurality of inverter bridge arm modules and a plurality of filter capacitor modules are provided on the circuit board 400. The inverter bridge arm module includes at least four switch tubes, and the filter capacitor module includes at least one capacitor.

[0069] Specifically, the multiple inverter bridge arm modules include an inverter bridge arm module 410 , an inverter bridge arm module 420 and an inverter bridge arm module 430 ; the multiple filter capacitor modules include a capacitor 441 , a capacitor 442 , a capacitor 443 and a capacitor 444 .

[0070] In an embodiment of the present application, a plurality of filter capacitor modules are sequentially arranged on the PCB along a first direction, and at least one inverter bridge arm module is arranged between any two filter capacitor modules.

[0071] It should be understood that in the embodiments of the present application, the horizontal direction is used as the first direction and the vertical direction is used as the second direction for illustration.

[0072] Exemplarily, an inverter bridge arm module 410 is provided between the capacitor 441 and the capacitor 442 , and an inverter bridge arm module 410 and an inverter bridge arm module 420 are provided between the capacitor 441 and the capacitor 443 .

[0073] In some embodiments, the switch tube in the above-mentioned inverter bridge arm module can be a power transistor (giant transistor, GTR), a metal-oxide-semiconductor field-effect transistor (metal-oxide-semiconductor field-effect transistor, MOSFET), an insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT), a gate turn-off thyristor (gate turn-off thyristor, GTO) or other suitable devices.

[0074] It should be understood that the above-mentioned capacitor is a decoupling capacitor. As an optional embodiment, the above-mentioned capacitor can be a film capacitor, and the material includes materials such as ceramic or polymer aluminum. Optionally, the decoupling capacitor can be designed by using a laminated or winding type structure to meet space limitations and performance requirements. Specifically, the winding type is a structure in which a polymer film is wound and punched, and then the polymer film is placed in a shell. The laminated type is a structure in which multiple layers of polymer films are stacked together, and then the laminate is placed in a shell. Among them, the dielectric of the decoupling capacitor can use various polymer materials such as polypropylene (PP) and polyester resin (polyethylene terephthalate, PET).

[0075] For example, in order to ensure a sufficient dynamic decoupling effect, the total capacitance of the decoupling capacitors may be more than 50 times the total parasitic output capacitance of the corresponding bridge arm switch tubes.

[0076] In some embodiments, the filter capacitor module may include multiple capacitors, and the connection mode of the multiple capacitors includes series connection, parallel connection, or a combination of series connection and parallel connection.

[0077] Figure 9 is a schematic diagram of a filter capacitor module circuit provided by an embodiment of the present application. For example, as shown in Figure 9 (a), the filter capacitor module circuit includes capacitors C11, C12, ..., and C1n, wherein capacitors C11 and C1n are connected in parallel. Compared to Figure 9 (a), Figure 9 (b) shows a series connection of capacitors C11 and C1n, and Figure 9 (c) shows a combination of multiple capacitors connected in series and in parallel.

[0078] In this way, by connecting a plurality of capacitors in combination, the absorption effect of the voltage spike of the switching tube can be improved.

[0079] It should be understood that the above-mentioned filter capacitor module circuit is only an exemplary topology. The filter capacitor module in this application can also be in other circuit topology forms, and this application does not limit this.

[0080] In some embodiments, the number of the plurality of filter capacitor modules is one more than the number of the plurality of inverter bridge arm modules, and the plurality of filter capacitor modules and the plurality of inverter bridge arm modules are alternately arranged in sequence along the first direction.

[0081] As shown in FIG4 , multiple filter capacitor modules and multiple inverter bridge arm modules are alternately arranged in sequence along a first direction. That is, multiple inverter bridge arm modules and multiple filter capacitor modules are arranged in the order of filter capacitor module, inverter bridge arm module, filter capacitor module, and inverter bridge arm module in the first direction. In addition, because the number of multiple filter capacitor modules is one greater than the number of multiple inverter bridge arm modules, each inverter bridge arm module can have a corresponding filter capacitor module on both sides, thereby improving the filter capacitor module's ability to absorb voltage spikes generated when the switching tubes in the inverter bridge arm modules are rapidly turned off.

[0082] Specifically, as shown in Figure 4, capacitors 441, inverter bridge arm modules 410, and capacitors 442 are alternately arranged in sequence along a first direction. In the circuit connection of the circuit board 400, capacitors 441 are connected in parallel with the inverter bridge arm modules 410, and capacitors 442 are connected in parallel with the inverter bridge arm modules 410. In other words, capacitors 441 and 442 are connected to the inverter bridge arm modules 410 in correspondence.

[0083] In an embodiment of the present application, the filter capacitor module includes a first capacitor unit, and the inverter bridge arm module includes two first switching tubes and two second switching tubes. The first capacitor units of the multiple filter capacitor modules are equidistantly distributed along a first distribution line along a first direction. The two first switching tubes of the inverter bridge arm module are equidistantly distributed along the first direction from the first capacitor units of the two adjacent filter capacitor modules, and the two second switching tubes of the inverter bridge arm module are equidistantly distributed along the first direction from the first capacitor units of the two adjacent filter capacitor modules. The two first switching tubes and the two second switching tubes are symmetrically distributed along the first distribution line.

[0084] As shown in Figure 4, capacitor 441, capacitor 442, capacitor 443 or capacitor 444 can all be regarded as a capacitor unit. Capacitor 441, capacitor 442, capacitor 443 or capacitor 444 are equidistantly distributed on a first distribution line along a first direction.

[0085] That is, the distance between two adjacent capacitors is the same, for example, the distance between capacitor 441 and capacitor 442 is the same as the distance between capacitor 442 and capacitor 443. In addition, as shown in FIG4 , capacitor 441, capacitor 442, capacitor 443, and capacitor 444 are all arranged on a first distribution straight line, wherein the capacitors are arranged on the first distribution straight line, that is, the first distribution straight line passes through a portion of each capacitor.

[0086] The inverter bridge arm module 410 includes a switch 411, a switch 412, a switch 413, and a switch 414. It should be understood that the embodiments of the present application do not limit the arrangement of the switches 411 to 414. For example, the switches 411 to 414 may be arranged sequentially along a first direction, and the pins of the switches 411 to 414 may be arranged in any direction.

[0087] Specifically, the switch tubes 411 and 412 of the inverter bridge arm module 410 are equidistantly distributed along the first direction from the first capacitor units of the two adjacent filter capacitor modules, that is, capacitors 441 and 442; the switch tubes 413 and 414 of the inverter bridge arm module 410 are equidistantly distributed along the first direction from the first capacitor units of the two adjacent filter capacitor modules, that is, capacitors 441 and 442.

[0088] In this way, by distributing the first capacitor units of multiple filter capacitor modules at equal distances, and distributing some switching tubes of the inverter bridge arm module at equal distances from the first capacitor units of two adjacent filter capacitor modules, the two adjacent filter capacitor modules can provide the same decoupling effect on the inverter bridge arm module.

[0089] It should be understood that the switch tubes 411 and 412 are equidistant from the adjacent capacitors 441 and 442 along the first direction. It can be considered that the switch tubes 411 and 412 are arranged in the middle position between the two adjacent capacitors 441 and 442 on the left and right.

[0090] The switch tubes 411 and 412 are symmetrically distributed along the first distribution line with the switch tubes 413 and 414 .

[0091] In this way, some of the switching tubes of the inverter bridge arm module and other parts of the switching tubes are symmetrically distributed along the distribution line of the multiple filter capacitor modules, which can reduce the space occupied by the multiple switching tubes of the inverter bridge arm module in the first direction, thereby making the routing distance between the two adjacent filter capacitor modules and the multiple switching tubes in the inverter bridge arm module shorter, and further reducing the parasitic inductance on the routing of the switching tube of the inverter bridge arm module and the corresponding filter capacitor module, thereby improving the absorption effect of the voltage spike of the switching tube in the inverter bridge arm module.

[0092] Optionally, the distance between two adjacent capacitors can be less than the first threshold, so that capacitors 441 and 442 are close to switches 411 and 412. It should be understood that the first threshold can be set based on experimental data, operating environment, safety requirements, and other factors. It should be understood that this application does not limit the method for determining the first threshold or the specific value setting.

[0093] For example, the first threshold is 55 mm, then the distance between capacitor 441 and capacitor 442 can be 54 mm. When the distance between the switch tube 411 and the switch tube 412 of the inverter bridge arm module 410 along the first direction is 50 mm, that is, along the first direction, the distance between capacitor 441 and switch tube 411 and the distance between capacitor 442 and switch tube 412 can both be 2 mm.

[0094] Optionally, the difference between the distance between two adjacent capacitors and the distance between the multiple switch tubes of the inverter bridge arm module 410 placed along the first direction is less than or equal to the distance between two adjacent switch tubes in the multiple switch tubes.

[0095] In some embodiments, the first threshold is less than or equal to the sum of a minimum distance between a plurality of switch tubes including the inverter bridge arm module along the first direction and a length occupied by the filter capacitor module in the first direction.

[0096] For example, the minimum distance between the multiple switching transistors of the inverter bridge arm module 410 along the first direction is 50 mm, and the length of the filter capacitor module, that is, capacitor 441, in the first direction is 30 mm. The first threshold value can be set to 80 mm. In other words, the distance between capacitor 441 and capacitor 442 is less than 80 mm.

[0097] It should be understood that the configuration of other inverter bridge arm modules in the circuit board 400 is similar to the configuration of the above-mentioned inverter bridge arm module 410 , and will not be repeated herein.

[0098] In some embodiments, the first capacitor includes an upper boundary and a lower boundary along the second direction, the upper boundary and the lower boundary of the first capacitor are parallel to the first distribution straight line, and at least a portion of the inverter bridge arm module is located between the extension lines of the upper boundary and the lower boundary of the first capacitor.

[0099] As shown in FIG4 , adjacent capacitors 441 and 442 include upper and lower boundaries along the second direction, respectively. Specifically, the upper boundaries of capacitors 441 and 442 are located on the upper boundary line, and the lower boundaries of capacitors 441 and 442 are located on the lower boundary line. The upper boundary line and the lower boundary line are parallel to the first distribution straight line. At least a portion of the inverter bridge arm module 410 is located between the extension lines of the upper and lower boundaries of capacitors 441 and 442, that is, between the upper boundary line and the lower boundary line in FIG4 .

[0100] In this way, by setting at least a portion of the inverter bridge arm module between the extension lines of the upper boundary and the lower boundary of the first capacitor of the two filter capacitor modules adjacent to the inverter bridge arm module, the routing distance between the multiple switching tubes in the inverter bridge arm module and the two adjacent filter capacitor modules can be further shortened.

[0101] In some embodiments, each switch tube in the inverter bridge arm module includes a pin, and the pins of the two first switch tubes and the two second switch tubes are located between extension lines of the upper boundary and the lower boundary of the first capacitor.

[0102] As shown in FIG4 , the black circles in FIG4 exemplarily represent the pins of the capacitor and the pins of the switch tube. It should be understood that the shorter the distance between the pins of each switch tube and the corresponding filter capacitor module, the smaller the parasitic inductance on the wiring connecting the pins, and the better the filter capacitor module's absorption effect on the voltage spike of the switch tube in the inverter bridge arm module.

[0103] In this way, by setting the pins of the switch tube in the inverter bridge arm module within a specific range between the extension lines of the upper boundary and the lower boundary of the first capacitor of two adjacent filter capacitor modules, the routing distance between the switch tube in the inverter bridge arm module and the filter capacitor module can be further reduced.

[0104] In some embodiments, the capacitor in the filter capacitor module includes a first pin and a second pin respectively disposed at two ends of the capacitor, and the first pin and the second pin are arranged along the second direction.

[0105] As shown in FIG. 4 , the two pins of the capacitor 441 are respectively disposed above and below the capacitor 441 along the second direction.

[0106] Optionally, the two pins of the capacitor 441 are respectively arranged above and below the capacitor 441 along the first direction, that is, arranged on the left side and right side of the capacitor 441 along the second direction, which is not limited in this application.

[0107] It should be understood that in the embodiment of the present application, by arranging the two pins of the capacitor at the two ends of the capacitor respectively along the second direction, the distance between the two pins of the capacitor and the corresponding inverter bridge arm module is the same, which can further reduce the distance between the two pins of the capacitor and the corresponding inverter bridge arm module.

[0108] In some embodiments, the first capacitor unit includes a second capacitor and a third capacitor. The two first switching tubes of the inverter bridge arm module and the second capacitors of the two adjacent filter capacitor modules are equidistantly distributed along the first direction, and the two second switching tubes of the inverter bridge arm module and the third capacitors of the two adjacent filter capacitor modules are equidistantly distributed along the first direction. The second capacitor and the third capacitor respectively include an upper boundary and a lower boundary along the second direction, and the upper boundary and the lower boundary of the second capacitor and the third capacitor are parallel to the first distribution straight line. At least part of the two first switching tubes are located between the extension lines of the upper boundary and the lower boundary of the second capacitor, and at least part of the two second switching tubes are located between the extension lines of the upper boundary and the lower boundary of the third capacitor, wherein the first direction is perpendicular to the second direction.

[0109] FIG5 is a schematic diagram of the layout of a circuit board 500 provided by the present application. It should be understood that the present embodiment only describes the differences between FIG5 and FIG4 .

[0110] As shown in FIG5 , an inverter bridge arm module 510 is provided between the filter capacitor module 540 and the filter capacitor module 550. The inverter bridge arm module 510 includes a switch tube 511, a switch tube 512, a switch tube 513, and a switch tube 514. The switch tubes 511 and 512 are arranged along a first direction, the switch tubes 511 and 513 are arranged along a second direction, and the switch tubes 512 and 514 are arranged along a third direction.

[0111] The first capacitor unit of the filter capacitor module 540 includes a capacitor 541 and a capacitor 542 , and the first capacitor unit of the filter capacitor module 550 includes a capacitor 551 and a capacitor 552 .

[0112] Specifically, the switch tubes 511 and 512 of the inverter bridge arm module 510 are equidistantly distributed along the first direction from the two adjacent filter capacitor modules, namely, the capacitors 541 and 551 of the filter capacitor module 540 and the filter capacitor module 550, and the switch tubes 513 and 514 of the inverter bridge arm module 510 are equidistantly distributed along the first direction from the adjacent capacitors 542 and 552.

[0113] It should be understood that in the circuit connection of the circuit board 500 , the capacitors 541 , 542 , 551 , 552 and the inverter bridge arm module 510 are connected in parallel.

[0114] In the embodiment of the present application, as shown in FIG5 , capacitors 541 and 551 adjacent to switch transistors 511 and 512 respectively include upper and lower boundaries along the second direction. Specifically, the upper boundaries of capacitors 541 and 551 are located on the upper boundary line 51 of filter capacitor module 540 and filter capacitor module 550, and the lower boundaries of capacitors 541 and 551 are located on the lower boundary line 52. The upper boundaries of capacitors 542 and 552 are located on the upper boundary line 53, and the lower boundaries of capacitors 542 and 552 are located on the lower boundary line 54 of filter capacitor module 540 and filter capacitor module 550. The upper and lower boundary lines of capacitors 541 and 551, as well as capacitors 542 and 552, are parallel to the first distribution straight line.

[0115] Specifically, at least part of the switch tubes 511 and 512 in the inverter bridge arm module 510 are located between the extension lines of the upper and lower boundaries of the capacitors 541 and 551, that is, between the upper boundary line 51 and the lower boundary line 52 in Figure 5; at least part of the switch tubes 513 and 514 in the inverter bridge arm module 410 are located between the extension lines of the upper and lower boundaries of the capacitors 542 and 552, that is, between the upper boundary line 53 and the lower boundary line 54 in Figure 5.

[0116] Optionally, the pins of the switch tubes 511 and 512 in the inverter bridge arm module 510 are located between the upper and lower boundaries of the capacitors 541 and 551, that is, between the upper boundary line 51 and the lower boundary line 52 in Figure 5; the pins of the switch tubes 513 and 514 in the inverter bridge arm module 410 are located between the upper and lower boundaries of the capacitors 542 and 552, that is, between the upper boundary line 53 and the lower boundary line 54 in Figure 5.

[0117] In this way, for the two groups of switching tubes symmetrically distributed along the first distribution straight line in the inverter bridge arm module, by limiting at least a portion of one group of switching tubes between the extension lines of the upper boundary and the lower boundary of the second capacitor, and limiting at least a portion of the other group of switching tubes between the extension lines of the upper boundary and the lower boundary of the third capacitor, the routing distance between the switching tubes and the corresponding capacitors in the inverter bridge arm module can be further reduced.

[0118] FIG6 is a schematic diagram of the layout of a circuit board 600 provided in this application.

[0119] As shown in FIG. 6 , compared with the layout of the circuit board 500 in the embodiment of FIG. 5 , the pins of the switch tube in the embodiment of the present application can be set at different positions in the switch tube.

[0120] The following uses a photovoltaic inverter as an example, and illustrates possible circuit connections of the bridge arm and filter in the inverter provided in the embodiments of the present application in conjunction with Figures 7 and 8. It should be understood that the inverter provided in the present application may include a two-level converter, a three-level converter, etc.

[0121] FIG7 is a schematic circuit diagram of a photovoltaic inverter provided in this application.

[0122] As shown in FIG. 7 , a photovoltaic inverter 700 includes at least one maximum power point tracking (MPPT) circuit 110 , a bus capacitor 111 , an inverter circuit 112 , and a filter circuit 113 .

[0123] Among them, at least one MPPT circuit 110 is used to connect multiple photovoltaic modules (not shown in the figure) and to adjust the output voltage of the photovoltaic module to track the maximum power operating point of multiple photovoltaic modules during normal operation. Specifically, the output end of at least one MPPT circuit is connected to the input port of the bus capacitor 111, the output port of the bus capacitor 111 is connected to the input port of the inverter circuit 112, the inverter circuit 112 is used to convert direct current into alternating current, the output port of the inverter circuit 112 is connected to the input port of the filter circuit 113, and the output port of the filter circuit 113 is used to connect to the AC power grid. Optionally, the filter circuit 113 also includes an inverter inductor 1131 and a filter capacitor 1132. Optionally, the filter circuit 113 can also include an adjustable filter with adjustable filter parameters to cope with changes in output frequency and equivalent impedance.

[0124] The inverter circuit 112 includes a three-phase bridge arm circuit (A phase circuit, B phase circuit, C phase circuit), and the input port of the inverter circuit 112 is connected to the DC bus, wherein a bus capacitor 111 is connected in series between the positive bus and the negative bus of the DC bus, and the bus capacitor 111 includes a positive bus capacitor and a negative bus capacitor. The current passes through the A phase circuit, the B phase circuit, and the C phase circuit and then outputs the current through the filter circuit 113. The current output by the A phase circuit, the B phase circuit, and the C phase circuit passes through the filter circuit 113 and then inputs the power grid. Each phase circuit includes an upper bridge arm, a lower bridge arm, and a bypass branch, wherein the inverter bridge arm module includes multiple switching tubes. In this application, the switching tube is turned on or off according to the driving signal of the input switching tube, which can make the inverter circuit 112 output different levels within one cycle. When the power input is positive, the inverter circuit 112 can output a positive voltage level, and when the power input is negative, the inverter circuit 112 can output a negative voltage level. It should be understood that the embodiment of the present application does not limit the number of multiple switch tubes. For example, each switch tube shown in FIG. 7 is a plurality of switch tubes connected in parallel.

[0125] Specifically, the inverter circuit module forms an inverter circuit 112 through the wiring on the PCB, and the inverter circuit module includes multiple inverter bridge arm modules and multiple filter capacitor modules. As shown in Figure 7, for example, capacitor 121 and capacitor 122 can constitute a filter capacitor module. Among them, capacitor 121 and capacitor 125, capacitor 122 and capacitor 126, ..., capacitor 124 and capacitor 128 are arranged alternately with the inverter bridge arm modules of phase A, phase B, and phase C, respectively, and are connected in parallel at both ends of the bus capacitor 111.

[0126] The photovoltaic inverter provided in FIG8 shows another topology of the inverter circuit 112. It should be noted that the present application does not limit the connection relationship of the various electronic components in the inverter circuit. As long as the electronic component connection method can convert DC voltage into AC voltage, it is applicable to the inverter provided in the present application.

[0127] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0128] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0129] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0130] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0131] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0132] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0133] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An inverter, characterized in that, The inverter includes an inverter circuit module and a printed circuit board (PCB). The inverter circuit module forms an inverter circuit through traces on the PCB. The first end of the inverter circuit is used to connect to a DC power supply, and the second end of the inverter circuit is used to connect to an AC power grid and / or a load. The inverter circuit module includes a plurality of inverter bridge arm modules and a plurality of filter capacitor modules. The inverter bridge arm module includes at least four switching tubes, and the filter capacitor module includes at least one capacitor. The plurality of filter capacitor modules are sequentially arranged on the PCB along a first direction, and at least one of the inverter bridge arm modules is arranged between any two of the filter capacitor modules.

2. The inverter according to claim 1, characterized in that, The number of the plurality of filter capacitor modules is one more than the number of the plurality of inverter bridge arm modules, and the plurality of filter capacitor modules and the plurality of inverter bridge arm modules are alternately arranged in sequence along the first direction.

3. The inverter according to claim 1 or 2, characterized in that, The filter capacitor module includes a first capacitor unit, and the inverter bridge arm module includes two first switching tubes and two second switching tubes. The first capacitor units of the plurality of filter capacitor modules are equidistantly distributed on a first distribution line along the first direction. The two first switching tubes of the inverter bridge arm module and the first capacitor units of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The two second switching tubes of the inverter bridge arm module and the first capacitor units of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The two first switching tubes and the two second switching tubes are symmetrically distributed along the first distribution line.

4. The inverter according to claim 3, characterized in that, The first capacitor unit includes a first capacitor. The two first switching tubes of the inverter bridge arm module and the first capacitors of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The two second switching tubes of the inverter bridge arm module and the first capacitors of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The first capacitor includes an upper boundary and a lower boundary along a second direction. The upper boundary and the lower boundary of the first capacitor are parallel to the first distribution line. At least part of the inverter bridge arm module is located between the extension lines where the upper boundary and the lower boundary of the first capacitor are located respectively, where the first direction and the second direction are perpendicular.

5. The inverter according to claim 4, characterized in that, Each switching tube in the inverter bridge arm module includes pins. The pins of the two first switching tubes and the two second switching tubes are located between the extension lines where the upper boundary and the lower boundary of the first capacitor are located respectively.

6. The inverter according to claim 3, wherein The first capacitor unit includes a second capacitor and a third capacitor. The two first switching tubes of the inverter bridge arm module and the second capacitors of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The two second switching tubes of the inverter bridge arm module and the third capacitors of two adjacent filter capacitor modules are equidistantly distributed along the first direction. The second capacitor and the third capacitor respectively include an upper boundary and a lower boundary along a second direction. The upper boundaries and the lower boundaries of the second capacitor and the third capacitor are parallel to the first distribution line. At least a part of the two first switching transistors is located between the extension lines where the upper boundary and the lower boundary of the second capacitor are located respectively, and at least a part of the two second switching transistors is located between the extension lines where the upper boundary and the lower boundary of the third capacitor are located respectively, where the first direction and the second direction are perpendicular.

7. The inverter according to claim 6, wherein Each switching transistor in the inverter bridge arm module includes pins. The pins of the two first switching transistors are located between the extension lines where the upper boundary and the lower boundary of the second capacitor are located respectively, and the pins of the two second switching transistors are located between the extension lines where the upper boundary and the lower boundary of the third capacitor are located respectively.

8. The inverter according to any one of claims 4-7, characterized in that, The capacitors in the filter capacitor module include a first pin and a second pin respectively arranged at both ends of the capacitor, and the first pin and the second pin are arranged along the second direction.

9. The inverter according to any one of claims 1-8, characterized in that, The filter capacitor module includes a plurality of capacitors, and the connection modes of the plurality of capacitors include series connection, parallel connection, or a combination of the series connection and the parallel connection.

10. The inverter according to any one of claims 1-9, characterized in that, The capacitor is a thin film capacitor.

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