An inverter, rectifier, frequency converter and photovoltaic power generation system

Abstract

The application provides an inverter, a rectifier, a frequency converter and a photovoltaic power generation system, wherein the inverter comprises a first power board, a second power board and a first filter, the first power board comprises a first input end, a second input end, an inverter circuit, a first filter circuit and an output end, the inverter circuit is used for converting direct current into alternating current, the first filter comprises an input end, a second filter circuit, a first output end and a second output end, the input end of the first filter is connected with the output end of the first power board, the impedance of the first output end of the first filter is smaller than the impedance of the second output end of the first filter, the second input end of the first power board is connected with the first output end of the first filter, the first filter circuit is connected with the second input end of the first power board, the input end of the second power board is connected with the second output end of the first filter, and the output end is used for connecting an alternating current network or a load. Therefore, the inverter provided by the application can improve the filtering effect and save cost.

Description

[0001] The present application claims priority to the Chinese patent application No. 202311277873.2, filed on September 27, 2023, with the State Intellectual Property Office of China, with the title of “An Inverter, Rectifier, Frequency Converter and Photovoltaic Power Generation System” and the priority of the Chinese patent application, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric power, in particular to an inverter, rectifier, frequency converter and photovoltaic power generation system. BACKGROUND

[0003] An inverter (INV) is a device that converts direct current (DC) into alternating current (AC). For a high-power inverter, in order to improve the power density of the whole machine, a double-layer architecture is usually adopted (one layer is mainly for power conversion function, and the other layer is mainly for power output and sampling control). The traditional AC filter layout of the inverter usually has a long filter loop, which can cause poor filtering effect and high cost. In order to shorten the filter loop, a more complex wiring method is adopted, which is difficult to design and has high cost. Therefore, how to make the high-power inverter consider both the filtering effect and the cost is a problem to be solved at present. SUMMARY

[0004] The present application provides an inverter, rectifier, frequency converter and photovoltaic power generation system, which can improve the filtering effect and save material cost.

[0005] In a first aspect, an inverter is provided, comprising a first power board, a second power board, an inverter circuit, a first filter circuit, a second filter circuit and a third filter circuit. The first power board is configured to fix the inverter circuit and the first filter circuit, and the first filter circuit is electrically connected to the inverter circuit through the first power board. The second filter circuit comprises one or more inverter inductors, and the output terminals of the inverter inductors are electrically connected to the input terminal of the first filter circuit through the first power board and the first wire. The second power board is configured to fix the third filter circuit, and the third filter circuit is electrically connected to the output terminals of the inverter inductors through the second power board and the second wire. The third filter circuit is configured to be electrically connected to a power grid or a load. The inverter circuit is configured to convert direct current into alternating current and transmit the alternating current to the inverter inductors. The inverter inductors are configured to filter the alternating current and transmit a part of the filtered alternating current to the first filter circuit through the first wire and transmit another part of the filtered alternating current to the third filter circuit through the second wire. The impedance of the electrical connection line between the output terminal of the inverter inductor and the output terminal of the first filter circuit to high-frequency ripple current is smaller than the impedance of the electrical connection line between the output terminal of the inverter inductor and the output terminal of the third filter circuit to high-frequency ripple current, and the frequency of the high-frequency ripple current is greater than the frequency of the power frequency. In this way, the high-frequency ripple current and the power frequency current can be automatically separated from the alternating current filtered by the inverter inductor, thereby ensuring the quality of the output current of the inverter. At the same time, since the high-frequency ripple current directly flows to the first filter circuit through the first wire, the filtering loop of the high-frequency ripple current can be shortened, and the electromagnetic compatibility of the inverter can be improved. Further, since the power frequency current directly flows to the third filter circuit through the second wire, the design of the first power board can be simplified, the wiring between the inverter inductor and the third filter circuit can be simplified, the wiring space of the inverter can be reduced, and the power density of the inverter can be improved.

[0006] In a possible implementation, the diameter of the first wire is smaller than the diameter of the second wire. Since the power frequency current is much larger than the high-frequency ripple current, in this way, the heat generation of the second wire can be reduced, and the power conversion efficiency of the inverter can be improved.

[0007] In a possible implementation, the inverter inductor comprises a coil, a magnetic core and a packaging body, the coil is wound around the magnetic core, and the coil and the magnetic core are arranged in the packaging body.

[0008] In a possible implementation, the first filter circuit comprises a capacitor.

[0009] In a possible implementation, the third filter circuit comprises a differential mode inductor, and the differential mode inductor is configured to filter a differential mode signal in the other part of the alternating current filtered by the inverter inductor.

[0010] In a possible implementation, the third filter circuit includes a common-mode inductor, and the common-mode inductor is configured to filter a common-mode signal in another part of the alternating current filtered by the inverter inductor.

[0011] In a second aspect, an inverter is provided, which includes a first power board, a second power board, an inverter circuit, a first filter circuit, a second filter circuit, and a third filter circuit. The first power board is configured to fix the inverter circuit and the first filter circuit, and the first filter circuit is electrically connected to the inverter circuit through the first power board. The second filter circuit includes one or more inverter inductors, and a first output end of the inverter inductor is electrically connected to an input end of the first filter circuit through a first wire. The second power board is configured to fix the third filter circuit, and the third filter circuit is electrically connected to a second output end of the inverter inductor through the second power board and a second wire in sequence, and the third filter circuit is configured to be electrically connected to a power grid or a load. The inverter circuit is configured to convert direct current into alternating current and transmit the alternating current to the inverter inductor, and the inverter inductor is configured to filter the alternating current and transmit a part of the filtered alternating current to the first filter circuit through the first wire and transmit another part of the filtered alternating current to the third filter circuit through the second wire. The impedance of an electrical connection line between the first output end of the inverter inductor and an output end of the first filter circuit to a high-frequency ripple current is smaller than the impedance of an electrical connection line between the second output end of the inverter inductor and an output end of the third filter circuit to the high-frequency ripple current, and the frequency of the high-frequency ripple current is greater than a power frequency. In this way, the high-frequency ripple current and the power frequency current can be automatically separated from the alternating current filtered by the inverter inductor, thereby ensuring the quality of the output current of the inverter. At the same time, since the high-frequency ripple current directly flows to the first filter circuit through the first wire, the filtering loop of the high-frequency ripple current can be shortened, and the electromagnetic compatibility of the inverter can be improved. Further, since the power frequency current directly flows to the third filter circuit through the second wire, the design of the first power board can be simplified, the wiring between the inverter inductor and the third filter circuit can be simplified, the wiring space of the inverter can be reduced, and the power density of the inverter can be improved.

[0012] In other possible implementations of the second aspect, refer to the implementations of the first aspect described above, and details are not described herein. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic diagram of a power generation system provided by an embodiment of the present application.

[0014] Figure 2 is a schematic diagram of an inverter provided by an embodiment of the present application.

[0015] Figure 3 is a schematic diagram of an inverter provided by an embodiment of the present application.

[0016] Figure 4A schematic diagram of an inverter is provided in embodiments of the present application.

[0017] Figure 5 A schematic diagram of a current suitable for embodiments of the present application.

[0018] Figure 6 A schematic diagram of an inductance suitable for embodiments of the present application.

[0019] Figure 7 A structural schematic diagram of a first power board, a second power board and a first filter is provided in embodiments of the present application.

[0020] Figure 8 A schematic diagram of a power generation system is provided in embodiments of the present application.

[0021] Figure 9 A schematic diagram of a power generation system is provided in embodiments of the present application.

[0022] Reference signs:

[0023] 100 - inverter; 200 - first power board; 300 - second power board; 400 - first filter; 210 - inverter circuit; 220 - first filter circuit; 21 - first input end of the first power board; 22 - second input end of the first power board; 23 - output end of the first power board; 31 - input end of the second power board; 32 - output end of the second power board; 41 - input end of the first filter; 42 - first output end of the first filter; 43 - second output end of the first filter; 410 - second filter circuit; 411 - inverter inductance; 4111 - coil; 4112 - magnetic core; 4113 - package. DETAILED DESCRIPTION

[0024] Hereinafter, terms that may appear in embodiments of the present application are explained.

[0025] Double-layer architecture inverter: It is a power converter used to convert direct current into alternating current, mainly adopting double-layer power board design, and placing control type circuit and power type circuit of the inverter on two different power boards. The control type circuit is located on the second power board, responsible for controlling the working state and output voltage of the inverter and other parameters; among them, the control type circuit usually includes a microprocessor or a digital signal processor, used for processing input signals, monitoring output voltage and current, and calculating control algorithm, etc. In addition, the control type circuit also includes a protection circuit, used for monitoring the running state of the inverter, and taking protective measures in time when faults or abnormal conditions occur. The inverter circuit is located on the first power board, when the control circuit issues instructions, the inverter circuit will control the switching state of the switching device according to the instructions, and convert the power of the direct current power supply into alternating current.

[0026] Inverse inductance: It is a common component in inverter circuits, used for filtering and stabilizing output voltage. Through its self-induction effect, it can suppress the change of current, thereby reducing the fluctuation of output voltage and harmonic content. When the switching device of the inverter switches, it will generate pulse current at the switching frequency. These pulse currents will pass through the inverse inductance, and due to the self-induction effect, the inverse inductance will resist the change of current, making the output current change more smoothly and reducing the harmonic components of the current. At the same time, the inverse inductance can also store energy, which will be released when the switching device is turned off, maintaining the continuity of the output current and stabilizing the output voltage. In addition, it can also suppress electromagnetic interference and reduce electromagnetic radiation, etc.

[0027] First filter circuit: It is a common circuit in inverters, used to further smooth the output current and reduce current ripple. The capacitor of the first filter circuit can store electric charge and provide electrical energy between the positive and negative half cycles of the current, thereby reducing the ripple of the current. The resistor of the first filter circuit mainly plays the role of consuming current, making the output current more stable.

[0028] Input midpoint of inverter circuit: It refers to the connection point between the two polarities of the input power supply of the inverter. Usually, the input power supply of the inverter is a direct current power supply, and this midpoint is the connection point between the positive and negative poles of the direct current power supply. The input midpoint of the inverter circuit plays a role in balancing and stabilizing the current in the inverter, and also helps to reduce current impact and voltage fluctuation, improving the stability and performance of the inverter. When using the inverter in an alternating current grid, the input midpoint can also be connected to the ground (ground wire) to provide better electrical safety and electromagnetic compatibility.

[0029] The technical solutions in the present application will be described below in conjunction with the drawings.

[0030] Figure 1 A schematic diagram of a photovoltaic power generation system, which includes: a photovoltaic assembly, an alternating current grid, and an inverter. Among them, the output port of the M photovoltaic assemblies is connected to the input end of the inverter, the output end of the inverter is connected to the input end of the alternating current grid, the photovoltaic assembly is used to generate direct current, wherein the inverter is used to invert the direct current, and the alternating current obtained by inverting is input to the alternating current grid, and the alternating current grid is used to provide alternating current to the outside.

[0031] It should be noted that the above photovoltaic assembly refers to a device that uses the photovoltaic effect of semiconductor materials under light conditions to directly convert solar energy into electrical energy. Photovoltaic assemblies can also be referred to as photovoltaic arrays, solar panels, etc.

[0032] The inverter in a photovoltaic power generation system is usually divided into a single-layer architecture and a double-layer architecture. In the inverter of the double-layer architecture, the wiring layout of the first filter circuit can be divided into two types. The first wiring layout is that the first filter circuit follows the second power board, as shown in Figure 2 The output end of the first power board and the input end of the filter are electrically connected, the output end of the filter is directly electrically connected with the input end of the second power board, direct current is input from the first input end of the first power board to the inverter circuit, after the direct current is converted into alternating current, the alternating current is output from the output end of the first power board to the input end of the filter, the alternating current is input from the input end of the second power board to the first filter circuit, after the ripple current is filtered, the alternating current is output, and the alternating current is output from the output end of the second power board to the alternating current grid or the load. In the above wiring layout of the first filter circuit, the ripple current has the problem of a long filtering path, which affects the filtering effect. In addition, in order to the electrical safety and electromagnetic compatibility of the circuit, the output end of the first filter circuit is electrically connected with the midpoint of the input end of the inverter circuit, and the path therebetween is also long, which is not conducive to cost saving.

[0033] The second wiring layout is that the first filter circuit follows the first power board, as shown in Figure 3 The output end of the filter inputs the alternating current processed by the inverter inductance to the second input end of the first power board, after the alternating current is filtered by the first filter circuit, a certain wiring space is needed on the first power board to connect the output end of the filter and the output end of the first power board, so that the alternating current is output from the output end of the first power board to the input end of the second power board. In the above wiring layout of the first filter circuit, the alternating current needs to be transferred from the first power board to the second power board, which requires a large wiring space on the first power board, and the design difficulty and cost also increase.

[0034] Therefore, the embodiment of the present application provides an inverter, which can make the wiring layout of the first filter circuit more reasonable, improve the filtering effect, and save material cost.

[0035] The embodiment of the present application provides an inverter 100, Figure 4 which is a schematic diagram of an inverter 100. The inverter 100 includes a first power board 200, a second power board 300 and a first filter 400. The first power board 200 and the second power board 300 can be placed in layers, and the second power board 300 is located above the first power board 200, or the first power board 200 and the second power board 300 are placed horizontally, and the first filter 400 is placed independently of the first power board 200 and the second power board 300.

[0036] Specifically, the first power board 200 includes a first input end 21, a second input end 22 and an output end 23 for fixing the inverter circuit 210 and the first filter circuit 220. Among them, the first input end 21 of the first power board 200 is used to input direct current from a direct current system or a rectifier and the like, the inverter circuit 210 is used to convert the direct current into alternating current, and the output end 23 of the first power board is used to output the alternating current. The first filter 400 includes an input end 41, a second filter circuit 410, a first output end 42 and a second output end 43, wherein the first output end 42 and the second output end 43 are collectively referred to as the output end of the inverter inductance 411, and the second filter circuit 410 can include one or more inverter inductances 411 in series. Hereinafter, one inverter inductance 411 is taken as an example for illustration.

[0037] The input end 41 of the first filter 400 and the output end 23 of the first power board 200 are electrically connected, and the alternating current is input from the input end 41 of the first filter 400 to the inverter inductance 411. The inverter inductance 411 is used to filter the alternating current output by the inverter circuit 210. Part of the alternating current processed by the inverter inductance 411 is output from the first output end 42, and another part of the alternating current processed by the inverter inductance 411 is output from the second output end 43.

[0038] It should be noted that, as shown in Figure 5 After being processed by the inverter inductance 411, the high-frequency ripple current is superimposed on the power frequency current on the time T and current I coordinate axis, the high-frequency ripple current is the fluctuation or ripple of current in the circuit caused by the alternating or periodic voltage source, which is easy to cause the electronic components to periodically absorb and release energy, thereby causing the components to heat up, increasing energy consumption, and possibly shortening the life of the components, generating electromagnetic interference and affecting the performance of other electronic devices or circuits. In some cases, the ripple current may cause oscillation problems in the circuit, leading to unstable working conditions and affecting the performance and reliability of the system. Among them, the frequency of the high-frequency ripple current is greater than the frequency of the power frequency current.

[0039] In order to make the inverter 100 output stable power frequency current, it is necessary to remove the high-frequency ripple current of the inverter inductance 411 output alternating current. For this purpose, please continue to refer to Figure 4The inverter inductance 411 is electrically connected to the first power board 200 through the first wire 51, and then a part of the alternating current filtered by the inverter inductance 411 is transmitted to the first power board 200 through the first wire 51, and the first power board 200 continues to transmit the part of the alternating current filtered by the inverter inductance 411 to the first filter circuit 220 through internal wiring. Further, the inverter inductance 411 is electrically connected to the second power board 300 for carrying the third filter circuit 310 through the second wire 52, and then another part of the alternating current filtered by the inverter inductance 411 is transmitted to the second power board 300 through the second wire 52, and the second power board 300 continues to transmit the other part of the alternating current filtered by the inverter inductance 411 to the third filter circuit 310 through internal wiring, and the third filter circuit 310 is used for connecting the power grid or the load. Among them, the impedance of the electrical connection line between the output end of the inverter inductance 411 and the output end of the first filter circuit 220 to the high-frequency ripple current is smaller than the impedance of the electrical connection line between the output end of the inverter inductance 411 and the output end of the third filter circuit 310 to the high-frequency ripple current.

[0040] Specifically, the high-frequency ripple current is output from the first output end 42 to the first input end 22 of the first power board 200, the input end of the first filter circuit 220 is electrically connected to the first input end 22 of the first power board, the output end of the first filter circuit 220 is connected to the midpoint of the input end of the inverter circuit, and the high-frequency ripple current is filtered by the first filter circuit 220. The second power board 300 includes an input end 31, a third filter circuit 310 and an output end 32, the third filter circuit 310 is connected in series between the input end 31 of the second power board 300 and the output end 32 of the second power board 300, and the alternating current is output from the second output end 43 of the first filter 400 to the input end 31 of the second power board, filtered by the third filter circuit 310, and then output from the output end 32 of the second power board to the alternating current grid or the load.

[0041] In this way, the high-frequency ripple current and the power frequency current can be automatically separated from the alternating current filtered by the inverter inductance 411, thereby ensuring the quality of the output current of the inverter 100. At the same time, since the high-frequency ripple current directly flows to the first filter circuit 220 through the first wire 51, the filtering circuit of the high-frequency ripple current can be shortened, and the electromagnetic compatibility of the inverter 100 can be improved. Further, since the power frequency current directly flows to the third filter circuit 310 through the second wire 52, the design of the first power board 200 can be simplified, the wiring between the inverter inductance 411 and the third filter circuit 310 can be simplified, the wiring space of the inverter 100 can be reduced, and the power density of the inverter 100 can be improved.

[0042] It should be noted that in actual application, the first output end 42 and the second output end 43 can be two independent terminals or a single terminal. When the first output end 42 and the second output end 43 are two independent terminals, the first output end 42 is electrically connected to the first power plate 200 through the first lead wire 51, the internal wiring of the first power plate 200 further electrically connects the first output end 42 to the first filter circuit 220, the second output end 43 is electrically connected to the second power plate 300 through the second lead wire 52, and the internal wiring of the second power plate 300 further electrically connects the second output end 43 to the third filter circuit 310. When the first output end 42 and the second output end 43 are a single terminal, the first lead wire 51 and the second lead wire 52 are wrapped with an insulating layer to form a lead wire, one end of the lead wire is connected to the terminal formed by the first output end 42 and the second output end 43, and the insulating layer of the middle part of the lead wire has a gap, which is used to lead out the first lead wire 51, thereby electrically connecting the first lead wire 51 to the first power plate 200 and electrically connecting the second lead wire 52 to the second power plate 300.

[0043] For the embodiment in which the first output end 42 and the second output end 43 are two independent terminals, please refer to Figure 6 . As shown in Figure 6 , the inverter inductor 411 includes a coil 4111, a magnetic core 4112, and a packaging body 4113, the coil 4111 is wound around the magnetic core 4112, and the coil 4111 and the magnetic core 4112 are arranged in the packaging body 4113. The end of the coil 4111 is divided into two independent terminals, i.e., the first output end 42 and the second output end 43, wherein the first output end 42 is used to be electrically connected to the first power plate 200 through the first lead wire 51, and the second output end 43 is used to be electrically connected to the second power plate 300 through the second lead wire 52. It is worth mentioning that, for the convenience of display, Figure 6 the shell of the first filter is hidden, and in actual application, a shell for accommodating the inverter inductor 411 can be arranged to further ensure the structural stability of the inverter inductor 411. The first filter 400 further includes a third lead wire (not shown), the inverter inductor 411 is connected to the input end 41 of the first filter 400 through the third lead wire, the third lead wire can be led out from the coil 4111 of the inverter inductor 411, or the third lead wire is connected to the lead wire of the coil.

[0044] Please refer to Figure 7 , Figure 7Fig. 2 is a structural schematic diagram of the first power board 200, the second power board 300 and the first filter 400. In the embodiment, the first output end 42 and the second output end 43 are integrated into one terminal, and the first conductive wire 51 and the second conductive wire 52 are wrapped by an insulating skin into one conductive wire. The first conductive wire 51 extends from a gap of the insulating skin in the middle of the conductive wire, and then the first conductive wire 51 is electrically connected with the first power board 200. The diameter of the first conductive wire 51 is smaller than the diameter of the second conductive wire 52. As described above, since the power frequency current is much larger than the high-frequency ripple current, the heat generation of the second conductive wire 52 can be reduced and the power conversion efficiency of the inverter 100 can be improved by such arrangement.

[0045] Further, the first filter 400 includes a shell 420 and a second filter circuit 410, and the second filter circuit 410 includes three inverter inductors 411. It is worth mentioning that the number of the inverter inductors 411 can be set as needed in actual application, and is not limited to three.

[0046] Optionally, the first output end 42 and the second output end 43 can pass through a superimposed switching circuit such as a multiplexer, or use an amplifier and other related circuits to amplify and process the selected output current, so as to improve the decoupling effect of the ripple current and the power current, which is not limited in the embodiment of the application.

[0047] The inverter provided by the embodiment of the application connects the first filter 400 to two output lines with different impedance sizes of high-frequency ripple current, changes the flow direction of the ripple current in the alternating current, and makes the high-frequency ripple current complete decoupling with the alternating current at the first output end 42 and the second output end 43 of the first filter 400, so as to improve the filtering effect, avoid the high-frequency ripple current following the alternating current to be filtered after being input to the second power board 300, effectively shorten the filtering path of the ripple current, reduce the instability of the alternating current earlier, and avoid the high-frequency ripple current following the alternating current to be transferred by the first power board 200 after being filtered by the first filter circuit 220, and then output to the second power board 300, so as to reduce the wiring space of the first power board 200 and save the cost.

[0048] In some embodiments, the inverter circuit 210 includes a driving control circuit, a direct current conversion circuit, a driving circuit, a protection detection circuit, a resonance capacitor, an output current sampling circuit, etc. The driving control circuit can include an oscillator and a modulator, and the driving circuit can include a power output tube and a high-voltage transformer, which are not limited in the embodiment of the application.

[0049] In some embodiments, the first filter circuit includes a capacitor, the high-frequency ripple current is input to the capacitor of the first filter circuit 220 and filtered by the capacitor. The first filter circuit 220 can further include a bipolar transistor, a unipolar transistor, an integrated operational amplifier, etc.

[0050] In some embodiments, the third filter circuit 310 includes a differential mode inductor, the differential mode inductor is used to filter a differential mode signal in the alternating current, an input end of the differential mode inductor is electrically connected to the input end 31 of the second power board, an output end of the differential mode inductor is electrically connected to the output end 32 of the second power board, the alternating current is input to the differential mode inductor from the input end 31 of the second power board, the differential mode signal is further filtered, and the filtered alternating current is output to the output end 32 of the second power board. In other embodiments, the third filter circuit 310 includes a common mode inductor, the common mode inductor is used to filter a common mode signal in the alternating current, an input end of the common mode inductor is electrically connected to the input end 31 of the second power board, an output end of the common mode inductor is electrically connected to an input end of the differential mode inductor, and an output end of the differential mode inductor is electrically connected to the output end 32 of the second power board, the common mode signal and the differential mode signal in the alternating current are further filtered. In the embodiments of the present application, by setting the differential mode inductor or the common mode inductor, the stability of the alternating current is further improved.

[0051] In some embodiments, the inverter 100 further includes a first switch, an output end of the first switch is connected to the output end of the inverter circuit 210, the output end of the first switch is connected to the output end 23 of the first power board, and the first switch is used to control the opening or conduction of the alternating current output by the inverter circuit 210. By setting the first switch, the signals or power sources between different circuits can be effectively isolated, preventing problems in one circuit from affecting another circuit, which is conducive to improving the stability and safety of the inverter circuit.

[0052] The embodiments of the present application also provide a wind power generation system, as shown in Figure 8 The inverter of the embodiments of the present application can be applied in the wind power generation system, and the wind power generation system includes a wind turbine, a rectifier, and an inverter. The inverter is used to convert the direct current from the wind turbine into alternating current and transmit the alternating current to a power grid.

[0053] The embodiments of the present application also provide a storage grid-connected power generation system, as shown in Figure 9 The inverter of the embodiments of the present application can be applied in the storage grid-connected power generation system, and the storage grid-connected power generation system is composed of a storage system, an inverter, and an alternating current grid. In the storage grid-connected power generation system, the inverter converts the direct current output by the storage system into alternating current, and transmits the converted alternating current to the alternating current grid.

[0054] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An inverter, characterized in that, It includes a first power board, a second power board, an inverter circuit, a first filter circuit, a second filter circuit, and a third filter circuit; wherein, The first power board is used to fix the inverter circuit and the first filter circuit. The first filter circuit is electrically connected to the DC input terminal of the inverter circuit through the first power board. The second filter circuit includes one or more inverter inductors, and the output terminal of the inverter inductor is electrically connected to the input terminal of the first filter circuit in sequence through the first wire and the first power board. The second power board is used to fix the third filter circuit. The third filter circuit is electrically connected to the output terminal of the inverter inductor through the second power board and the second wire in sequence. The third filter circuit is also used to electrically connect to the power grid or load. The inverter circuit converts direct current (DC) into alternating current (AC) and transmits the AC to the inverter inductor. The inverter inductor filters the AC and transmits a portion of the filtered AC to the first filter circuit via the first conductor, and another portion of the filtered AC to the third filter circuit via the second conductor. The impedance of the electrical connection line between the output terminal of the inverter inductor and the output terminal of the first filter circuit to the high-frequency ripple current is less than the impedance of the electrical connection line between the output terminal of the inverter inductor and the output terminal of the third filter circuit to the high-frequency ripple current, and the frequency of the high-frequency ripple current is greater than the power frequency.

2. The inverter according to claim 1, characterized in that, The diameter of the first conductor is smaller than the diameter of the second conductor.

3. The inverter according to claim 1, characterized in that, The inverter inductor includes a coil, a magnetic core, and a package. The coil is wound around the magnetic core, and the coil and the magnetic core are disposed within the package.

4. The inverter according to claim 1, characterized in that, The first filter circuit includes a capacitor.

5. The inverter according to any one of claims 1 to 4, characterized in that, The third filtering circuit includes a differential-mode inductor, which is used to filter the differential-mode signal in another part of the AC power after it has been filtered by the inverter inductor.

6. The inverter according to any one of claims 1 to 4, characterized in that, The third filtering circuit includes a common-mode inductor, which is used to filter the common-mode signal in another part of the AC power after it has been filtered by the inverter inductor.

7. An inverter, characterized in that, It includes a first power board, a second power board inverter circuit, a first filter circuit, a second filter circuit, and a third filter circuit; The first power board includes an inverter circuit and a first filter circuit, and the first filter circuit is electrically connected to the DC input terminal of the inverter circuit through the first power board; The second filter circuit includes one or more inverter inductors, and the first output terminal of the inverter inductor is electrically connected to the input terminal of the first filter circuit in sequence through the first wire and the first power board. The second power board is used to fix the third filter circuit. The third filter circuit is electrically connected to the second output terminal of the inverter inductor through the second power board and the second wire. The third filter circuit is also used to electrically connect to the power grid or load. The inverter circuit converts direct current (DC) into alternating current (AC) and transmits the AC to the inverter inductor. The inverter inductor filters the AC and transmits a portion of the filtered AC to the first filter circuit via the first conductor, and another portion of the filtered AC to the third filter circuit via the second conductor. The impedance of the electrical connection line between the first output terminal of the inverter inductor and the output terminal of the first filter circuit to the high-frequency ripple current is less than the impedance of the electrical connection line between the second output terminal of the inverter inductor and the output terminal of the third filter circuit to the high-frequency ripple current, and the frequency of the high-frequency ripple current is greater than the power frequency.

8. The inverter according to claim 7, characterized in that, The diameter of the first conductor is smaller than the diameter of the second conductor.

9. The inverter according to claim 7, characterized in that, The inverter inductor includes a coil, a magnetic core, and a package. The coil is wound around the magnetic core, and the coil and the magnetic core are disposed within the package.

10. The inverter according to claim 7, characterized in that, The first filter circuit includes a capacitor.

11. The inverter according to any one of claims 7 to 10, characterized in that, The third filtering circuit includes a differential-mode inductor, which is used to filter the differential-mode signal in another part of the AC power after it has been filtered by the inverter inductor.

12. The inverter according to any one of claims 7 to 10, characterized in that, The third filtering circuit includes a common-mode inductor, which is used to filter the common-mode signal in another part of the AC power after it has been filtered by the inverter inductor.

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