Photovoltaic common-mode inductor circuit and inverter

Abstract

The utility model relates to an energy storage inverter, in particular to a power board layout structure, a transformer and an inverter. The circuit and the inverter comprise a photovoltaic access end module, a common mode inductor module, a boosting module and a bus output module, the photovoltaic access end comprises a plurality of anode branches and a cathode branch; the common mode inductor module comprises positive electrode common mode inductors connected to the positive electrode branches and negative electrode common mode inductors connected to the negative electrode branches, and the positive electrode common mode inductors and the negative electrode common mode inductors share one magnetic core; the boost module comprises a plurality of boost circuits which are connected in parallel, the positive electrode of each boost circuit is connected with one positive electrode common mode inductor, and the negative electrodes of the boost circuits are converged in one path and then are connected with the negative electrode common mode inductor. Positive and negative currents flowing through the common-mode inductor are equal all the time, so that the problems of inductor burning, magnetic core saturation and the like caused by unequal sizes of the positive and negative currents flowing through the common-mode inductor are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage inverter device especially a power board layout structure, transformer and inverter. BACKGROUND

[0002] The common-mode inductor is an electronic component commonly used in photovoltaic systems to suppress common-mode noise and reduce electromagnetic interference (EMI), particularly in inverters.

[0003] The common-mode inductor is typically composed of multiple windings (coils) that are wound around the same magnetic core. The direction of each winding is opposite, so when a common-mode current passes through these windings, the magnetic fields they generate cancel each other out, reducing the propagation of noise.

[0004] The existing multi-path photovoltaic input circuit as shown in the figure takes two paths of photovoltaic input as an example; since the negative poles of the two paths of photovoltaic input are ultimately connected together, the negative poles of the photovoltaic input are shared on a copper foil for wiring when the circuit is laid out; such a layout has a disadvantage, for example, when only one path of photovoltaic input is input, the negative pole current may pass through the two inductors L1 and L2, causing the positive and negative currents flowing through the common-mode inductor to be unequal in size, thereby causing the inductor to overheat, the magnetic core to saturate, and ultimately lose its function. Figure 1 SUMMARY The first aspect, the embodiment of the application provides a photovoltaic common-mode inductor circuit for solving the problem of unequal negative pole current of the existing common-mode inductor.

[0005] The first aspect, the embodiment of the application provides a photovoltaic common-mode inductor circuit for solving the problem of unequal negative pole current of the existing common-mode inductor.

[0006] The photovoltaic common-mode inductor circuit includes a photovoltaic access end module, a common-mode inductor module, a boost module, and a bus output module;

[0007] The photovoltaic access end includes a plurality of positive pole branches and a negative pole branch;

[0008] The common-mode inductor module includes a positive common-mode inductor connected to each of the positive pole branches and a negative common-mode inductor connected to the negative pole branch, and the plurality of positive common-mode inductors and negative common-mode inductors share one magnetic core;

[0009] The boost module includes a plurality of parallel boost circuits, the positive pole of each boost circuit is connected to a positive common-mode inductor, and the negative poles of the plurality of boost circuits are connected to the negative common-mode inductor after being connected to one path;

[0010] The positive pole of the bus output module is connected to the positive poles of the plurality of parallel boost circuits, and the negative pole of the bus output module is connected to the negative poles of the plurality of parallel boost circuits.

[0011] Due to the above scheme, the photovoltaic common-mode inductor circuit adopts multiple positive common-mode inductors and one negative common-mode inductor to form a common-mode inductor circuit, and the multiple positive common-mode inductors and the negative common-mode inductor share one magnetic core, so that when the photovoltaic current is input, no matter whether the input line is multiple or one, and how the PCB is laid out, the positive and negative currents flowing through the common-mode inductor are always equal in size, thereby solving the problems of burning of the inductor and saturation of the magnetic core caused by the difference in size of the positive and negative electrodes flowing through the common-mode inductor.

[0012] In a possible implementation, the boost circuit includes an inductor, a switch tube, a diode, and a filter capacitor, a positive electrode of the inductor is connected with the positive common-mode inductor, a negative electrode of the inductor is connected to a positive electrode of the bus output module through the diode in one way, and the negative electrode of the inductor is connected to a positive electrode of the switch tube in another way, a negative electrode of the switch tube is connected to the negative common-mode inductor, and the filter capacitor is connected in parallel between the inductor and the switch tube.

[0013] In a possible implementation, the switch tube is an igbt, a collector of the igbt is connected to the negative electrode of the inductor, and a negative electrode of the igbt is connected to the negative common-mode inductor.

[0014] In a possible implementation, a filter capacitor is arranged between each positive branch and negative branch.

[0015] In the second aspect, the embodiments of the present application also provide an inverter, the inverter includes the photovoltaic common-mode inductor circuit of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a circuit schematic diagram of the existing common-mode inductor circuit;

[0017] Figure 2 It is a module schematic diagram of the embodiments of the present application;

[0018] Figure 3 It is a circuit schematic diagram of the embodiments of the present application. DETAILED DESCRIPTION

[0019] The following will be further described in detail in combination with specific embodiments and drawings. Obviously, the described embodiments are only part of the embodiments, rather than all the embodiments. Based on the following embodiments, all other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0020] It should be understood that, in the embodiments, all directional indications, such as "upper", "lower", "left", "right", "front", "back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship used in use, only for the purpose of simplifying the description, and do not mean or imply that the device, element or component referred to must have a particular orientation and a particular orientation configuration, and should not be understood as a limitation on the embodiments. Only for explaining the relative positional relationship, movement condition, etc. between the components shown in the drawings, when the specific attitude changes, the directional indications may also change accordingly.

[0021] In addition, ordinal numbers such as "first", "second", etc. in the embodiments are only for distinguishing purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of technical features referred to. Therefore, the "first", "second" features thus defined can explicitly or implicitly indicate at least one of the technical features. In the description of the embodiments, the meaning of "multiple" is at least two, that is, two or more, unless otherwise explicitly limited; the meaning of "at least one" is one or more.

[0022] In the embodiments, unless otherwise explicitly specified and limited, the terms "mount", "set", "connect", "fix", "screw", etc. should be understood in a broad sense, for example, the positional relationship between the components can be relatively fixed, or there can be a physically fixed connection between the components, which can be detachable or integrated structure; it can be mechanical connection or electrical signal connection; it can be direct connection or indirect connection through intermediate media or components; it can be internal communication between two elements or interaction relationship between two elements. The specific connection mode should be understood in combination with the device properties, and unless the specification explicitly limits, it cannot be understood as other understanding when it does not achieve the corresponding function or effect. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] In the embodiments, the controllers and control circuits involved are conventional control technologies or units for those skilled in the art, for example, the control circuit of the controller can be realized by programming by those skilled in the art. The software or program involved in the control result realized by cooperating with the hardware, such as the control process of the software or program not described in detail in the specification, belongs to the use of existing technology or the conventional technology of those skilled in the art. The power supply also uses the existing technology in the art, and the main technical point is the improvement of the mechanical device, so the specific circuit control relationship and circuit connection in the embodiments are not described in detail.

[0024] The disclosure of the embodiments provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described in the embodiments. Of course, they are only examples and the purpose is not to limit the present application. In addition, the reference numerals and / or reference letters can be repeated in different examples in the embodiments. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, if examples of various specific processes and materials are provided in the embodiments, those skilled in the art can realize the application of other processes and / or the use of other materials.

[0025] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only for illustration and explanation, and are not intended to limit the scope of protection of the present application.

[0026] As shown in Figure 2 and Figure 3 The embodiments of the present application provide a photovoltaic common-mode inductance circuit to solve the problem of unequal negative current size of existing common-mode inductance.

[0027] The photovoltaic common-mode inductance circuit includes a photovoltaic access end module 1, a common-mode inductance module 2, a boost module 3 and a bus output module 4;

[0028] The photovoltaic access end 1 includes a plurality of positive branches 11 (PV1+, PV2+) and a negative branch 12 (PV-);

[0029] The common-mode inductance module 2 includes a positive common-mode inductance 21 connected to each of the positive branches and a negative common-mode inductance 22 connected to the negative branch, and the plurality of positive common-mode inductances and negative common-mode inductances share a magnetic core;

[0030] The boost module 3 includes a plurality of parallel boost circuits 31, the positive of each boost circuit 31 is connected to a positive common-mode inductance 21, and the negative of a plurality of boost circuits 31 is connected to a negative common-mode inductance 22 after being merged into one path;

[0031] The positive of the bus output module 4 is connected to the positive of the plurality of parallel boost circuits 31, and the negative of the bus output module 3 is connected to the negative of the plurality of parallel boost circuits 31.

[0032] In operation, the plurality of positive common-mode inductors 21 and the negative common-mode inductor 22 share one magnetic core. Since the negative poles of the branches through the photovoltaic input all flow through the same negative common-mode inductor, the current flowing through the positive common-mode inductor and the negative common-mode inductor is always equal, whether the photovoltaic input is multi-channel or single-channel, thus effectively avoiding related problems caused by the unequal current flowing through the positive and negative poles of the common-mode inductor.

[0033] In this embodiment, the boost circuit includes an inductor, a switch tube, a diode, and a filter capacitor. The positive pole of the inductor is connected to the positive common-mode inductor. One path of the negative pole of the inductor is connected to the positive pole of the bus output module through the diode. The other path of the negative pole of the inductor is connected to the positive pole of the switch tube. The negative pole of the switch tube is connected to the negative common-mode inductor. The filter capacitor is connected in parallel between the inductor and the switch tube.

[0034] Preferably, the switch tube is an igbt. The collector of the igbt is connected to the negative pole of the inductor. The negative pole of the igbt is connected to the negative common-mode inductor.

[0035] In a possible implementation, a filter capacitor is arranged between each positive branch and negative branch.

[0036] In a second aspect, the embodiments of the present application also provide an inverter. The inverter includes the photovoltaic common-mode inductor circuit of the first aspect.

[0037] The above description is only the preferred embodiments of the embodiments of the present application, and does not limit the disclosure range of the embodiments of the present application. Any equivalent structure or equivalent flow transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range supported by the embodiments of the present application.

Claims

1. A photovoltaic common-mode inductance circuit, comprising a photovoltaic access end module, a common-mode inductance module, a boost module and a bus output module; characterized in that: the photovoltaic access end module comprises a plurality of positive electrode branches and a negative electrode branch; the common-mode inductance module comprises a positive common-mode inductor connected to each of the positive electrode branches and a negative common-mode inductor connected to the negative electrode branch, the plurality of positive common-mode inductors and the negative common-mode inductor sharing a magnetic core; the boost module comprises a plurality of parallel boost circuits, a positive electrode of each of the boost circuits being connected to a positive common-mode inductor, negative electrodes of the plurality of boost circuits being connected to the negative common-mode inductor; a positive electrode of the bus output module is connected to positive electrodes of the plurality of parallel boost circuits, and a negative electrode of the bus output module is connected to negative electrodes of the plurality of parallel boost circuits.

2. The photovoltaic common-mode inductance circuit of claim 1, wherein: the boost circuit comprises an inductor, a switch tube, a diode and a filter capacitor, a positive electrode of the inductor being connected to the positive common-mode inductor, a negative electrode of the inductor being connected to the positive electrode of the bus output module via the diode, the other negative electrode of the inductor being connected to a positive electrode of the switch tube, a negative electrode of the switch tube being connected to the negative common-mode inductor, and the filter capacitor being connected in parallel between the inductor and the switch tube.

3. The photovoltaic common-mode inductance circuit of claim 2, wherein: the switch tube is an igbt, a collector of the igbt being connected to the negative electrode of the inductor, and a negative electrode of the igbt being connected to the negative common-mode inductor.

4. The photovoltaic common-mode inductance circuit of claim 1, wherein: a filter capacitor is arranged between each of the positive electrode branches and the negative electrode branch.

5. An inverter, characterized by the inverter comprises the photovoltaic common-mode inductance circuit according to any one of claims 1-4.

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