Magnetic integrated structure and power conversion device

Abstract

The embodiment of the utility model provides a magnetic integrated structure and a power conversion device, relates to the technical field of electrical equipment, and is used for solving the problem of difficult winding. The support is provided with a first channel, the first channel penetrates through the support in the first direction, a part of the magnetic core is arranged in the first channel in a penetrating mode, and the first direction is the axial direction of the first channel. The base is arranged on one side of the support in the radial direction of the first channel. The primary winding is inserted into the base, and the support penetrates through the primary winding. The first secondary winding and the second secondary winding are sequentially wound on the peripheral surface of the bracket along the axial direction of the first channel, and a gap is formed between the first secondary winding and the second secondary winding. The first secondary winding and the second secondary winding are located between the primary winding and the support in the radial direction of the first channel. The primary winding, the first secondary winding and the second secondary winding can be wound before the magnetic integrated structure is assembled, so that automatic winding of the windings can be realized, time and labor are saved, and the magnetic integrated structure is convenient to popularize on a production line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a magnetic integrated structure and a power conversion device. BACKGROUND

[0002] The direct current side of a photovoltaic power generation system has a direct current arc phenomenon, and the generated arc is easy to cause a fire, which seriously affects the safe operation of the photovoltaic power generation system.

[0003] The photovoltaic power generation system includes a photovoltaic module, a photovoltaic optimizer, and an inverter. The photovoltaic optimizer is connected in series with the photovoltaic module to convert a low current of the photovoltaic module into a high current, and the converted high current is transmitted to the inverter, and the inverter converts direct current into alternating current to provide alternating current to the outside. Among them, the photovoltaic power generation system including the photovoltaic optimizer generally uses a current transformer to detect an arc fault characteristic signal in a direct current circuit to reduce the possibility of a fire caused by a direct current arc, and a signal transformer is used for PLC (Power Line Carrier) communication of the photovoltaic optimizer.

[0004] In the related art, the current transformer for abnormal arc detection and the signal transformer for PLC communication are integrated, and the integrated device has a large volume and limited winding space, usually requiring manual winding by an operator, and has low automation and is difficult to popularize on a production line. CONTENT OF THE UTILITY MODEL

[0005] The present application provides a magnetic integrated structure and a power conversion device to facilitate automatic winding.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a magnetic integrated structure, which includes a magnetic core, a primary winding, a first secondary winding, a second secondary winding, a support, and a base. The support has a first channel that penetrates the support along a first direction, and a portion of the magnetic core is arranged in the first channel, and the first direction is the axial direction of the first channel. The base is arranged on one side of the support along the radial direction of the first channel. The primary winding is inserted into the base, and the support passes through the primary winding. The first secondary winding and the second secondary winding are sequentially wound on the outer circumferential surface of the support along the axial direction of the first channel, and the first secondary winding and the second secondary winding have a gap therebetween. The first secondary winding and the second secondary winding are located between the primary winding and the support along the radial direction of the first channel.

[0008] In the magnetic integrated structure provided in the present application, since a part of the magnetic core is arranged in the first channel of the support, the first secondary side winding and the second secondary side winding are sequentially arranged on the outer circumferential surface of the support along the axial direction of the first channel. That is, the first secondary side winding and the second secondary side winding are not directly arranged on the magnetic core, but are indirectly arranged on the magnetic core through the support. During winding, the first secondary side winding and the second secondary side winding can be arranged on the support first, and then the magnetic core is arranged through the first channel of the support, so that the first secondary side winding and the second secondary side winding are indirectly arranged on the magnetic core.

[0009] Along the radial direction of the first channel, the base is arranged on one side of the support, the primary side winding is arranged in the base, and the support passes through the primary side winding. That is, the primary side winding is neither directly arranged on the support nor directly arranged on the magnetic core. During winding, the primary side winding can be arranged in the base first, and then the support passes through the primary side winding. Since the magnetic core is arranged through the first channel of the support, the primary side winding can be indirectly arranged on the magnetic core.

[0010] The gap is arranged between the first secondary side winding and the second secondary side winding. The arrangement of the gap can increase the creepage distance between the first secondary side winding and the second secondary side winding, thereby reducing or avoiding the possibility of short circuit due to too small distance between the first secondary side winding and the second secondary side winding, and facilitating to improve the safety and reliability of the magnetic integrated structure.

[0011] During installation of the magnetic integrated structure, the primary side winding can be arranged in the base, the first secondary side winding and the second secondary side winding can be sequentially arranged on the outer circumferential surface of the support along the axial direction of the first channel, and then the support (i.e. the support arranged with the first secondary side winding and the second secondary side winding) passes through the primary side winding. The first secondary side winding and the second secondary side winding after being arranged pass between the primary side winding and the support, and then the magnetic core is arranged through the first channel of the support. Finally, the magnetic core and the support are connected to complete the assembly of the magnetic integrated structure.

[0012] The winding of the primary side winding, the first secondary side winding and the second secondary side winding can be performed before the assembly of the magnetic integrated structure, so that there is sufficient winding space during winding of the primary side winding, the first secondary side winding and the second secondary side winding, and thus the automatic winding of the primary side winding, the first secondary side winding and the second secondary side winding can be realized, which is more time-saving and labor-saving compared with manual winding, and is convenient for popularization on the production line.

[0013] In addition, the arrangement of the primary side winding on the base, the connection of the support and the base, and the arrangement of the magnetic core through the first channel of the support can be realized through automatic operation such as mechanical arm operation, so that the automatic assembly of the magnetic integrated structure can be realized, which is convenient for completing a large number of assembly tasks in a short time, shortening the production cycle and improving the production efficiency.

[0014] In some examples, the primary winding and the base constitute an integrally formed structure. It can be understood that the primary winding and the base are integrally formed by embedding or other process to form the integrally formed structure.

[0015] In this way, during processing, the winding process of the primary winding can be saved to reduce the assembly process and improve assembly efficiency.

[0016] In an alternative embodiment, the support includes a first portion and a second portion spaced apart along the first direction, the first portion and the second portion are connected by a clamping structure, and the inner wall of the first portion and the inner wall of the second portion enclose a first channel. The first secondary winding is wound around the first portion. The second secondary winding is wound around the second portion.

[0017] During winding, the first secondary winding can be wound around the first portion and the second secondary winding can be wound around the second portion, respectively. Then the first portion and the second portion are connected by the clamping structure to form the support. In some examples, the first secondary winding and the second secondary winding can be wound at the same time to improve assembly efficiency and shorten the production cycle.

[0018] In some examples, the first portion can be inserted from one end of the primary winding in the first direction, the second portion can be inserted from the other end of the primary winding in the first direction, and the portion of the first portion inserted into the primary winding and the portion of the second portion inserted into the primary winding can be connected by the clamping structure. Not only is the connection convenient and fast, but also when designing the support and the primary winding, the portions of the first portion and the second portion that are not inserted into the primary winding do not need to be considered to avoid the primary winding. Similarly, the primary winding does not need to be considered to avoid the portions of the first portion and the second portion that are not inserted into the primary winding. In other words, the support and the primary winding can be smaller in size, i.e., the support and the primary winding can occupy less space, thereby making the magnetic integrated structure more compact and occupying less space.

[0019] In an alternative embodiment, the clamping structure includes a first protrusion and a first recess. One of the first portion and the second portion is provided with the first protrusion. The other of the first portion and the second portion is provided with the first recess.

[0020] During assembly, the first protrusion is accommodated in the first recess to achieve the mating connection of the first protrusion and the first recess, thereby achieving the clamping of the first portion and the second portion.

[0021] For example, in some examples, the outer peripheral surface of the first portion is provided with the first protrusion, and the inner wall surface of the second portion is provided with the first recess. During assembly, the end of the first portion is inserted into the second portion, and the first protrusion is connected with the first recess, i.e., the first protrusion is accommodated in the first recess, to achieve the connection of the first portion and the second portion. This connection method is simple and convenient to operate.

[0022] In this example, the first protrusions are provided in plurality, and the plurality of first protrusions are arranged at intervals around the circumference of the first part. The number of the first grooves is the same as that of the first protrusions and each first groove corresponds to a first protrusion. In this way, each first protrusion can be connected with the corresponding first groove to increase the number of connection points of the first part and the second part, thereby improving the connection reliability of the first part and the second part.

[0023] In some examples, the plurality of first protrusions are arranged at intervals around the circumference of the first part uniformly, so that the connection points of the first part and the second part are arranged at intervals around the circumference of the first part uniformly, so that the first part and the second part are stressed uniformly, further improving the connection reliability of the first part and the second part.

[0024] In some examples, the outer circumferential surface of the first part is provided with a protrusion, and the protrusion abuts against the second part.

[0025] By means of the protrusion, the insertion depth of the first part can be limited, preventing damage to the second part caused by excessive insertion of the first part.

[0026] In addition, the position of the protrusion can also be set as a basis for determining whether the first part and the second part are connected in place. For example, the position of the protrusion is determined according to the insertion depth of the first part. If the protrusion contacts the second part, the first part and the second part are connected in place. If not, the first part and the second part are not connected in place. When assembling, the user only needs to align the first part with the second part and insert it, without worrying about the problem of insufficient or excessive insertion. This not only improves work efficiency, but also reduces the difficulty of operation.

[0027] In other examples, the outer circumferential surface of the second part is provided with a first protrusion, and the inner wall surface of the first part is provided with a first groove. When assembling, the end of the second part is inserted into the first part, and the first protrusion is connected with the first groove in cooperation, i.e. the first protrusion is accommodated in the first groove, to realize the connection of the first part and the second part. The outer circumferential surface of the second part is provided with the first protrusion, and the outer circumferential surface of the first part is provided with the first protrusion. The setting mode and advantages are the same, which will not be described here.

[0028] In an alternative embodiment, the outer circumferential surface of the bracket has a first ring groove and a second ring groove, and the first ring groove and the second ring groove are arranged at intervals in a first direction. The first sub-coil is accommodated in the first ring groove. The second sub-coil is accommodated in the second ring groove.

[0029] The first sub-edge winding is limited in sliding along the first direction on the support by the first ring groove. The second sub-edge winding is limited in sliding along the first direction on the support by the second ring groove. In this way, the distance between the first sub-edge winding and the second sub-edge winding can be prevented from being reduced due to the sliding of the first sub-edge winding and the second sub-edge winding on the support, i.e. the creepage distance between the first sub-edge winding and the second sub-edge winding is reduced, and the first sub-edge winding and the second sub-edge winding are prevented from being too close to each other to cause short circuit.

[0030] For example, the first sub-edge winding is accommodated in the first ring groove, and when the first sub-edge winding slides along the first direction on the support to abut against one side wall of the first ring groove, the side wall can abut against the first sub-edge winding to block the sliding of the first sub-edge winding along the first direction. In some examples, the two side walls of the first ring groove along the first direction can be caused to abut against the two ends of the first sub-edge winding along the first direction respectively, so as to limit the first sub-edge winding in the first ring groove and further reduce the possibility of the first sub-edge winding moving along the first direction.

[0031] The second sub-edge winding is accommodated in the second ring groove, and when the second sub-edge winding slides along the first direction on the support to abut against one side wall of the second ring groove, the side wall can abut against the second sub-edge winding to block the sliding of the second sub-edge winding along the first direction. In some examples, the two side walls of the second ring groove along the first direction can be caused to abut against the two ends of the second sub-edge winding along the first direction respectively, so as to limit the second sub-edge winding in the second ring groove and further reduce the possibility of the second sub-edge winding moving along the first direction.

[0032] In an optional implementation, the end of the support in the first direction is provided with a ring-shaped protrusion, which protrudes away from the surface of the base and protrudes from the original edge winding. Along the first channel in the radial direction, the edge of the ring-shaped protrusion extends in a direction away from the original edge winding to form a first flange, a second flange and a third flange, the first flange is located on the side of the ring-shaped protrusion close to the base, and the first flange is connected between the second flange and the third flange.

[0033] Since the magnetic core is an electrically conductive body, a part of the magnetic core is arranged in the first channel of the support, and another part of the magnetic core is arranged outside the support. If the distance between any one of the original edge winding, the first sub-edge winding and the second sub-edge winding and the part of the magnetic core arranged outside the support is too small, a short circuit may occur. In order to prevent the winding from short-circuiting with the part of the magnetic core arranged outside the support, the outermost end of the support in the first direction is provided with a ring-shaped protrusion. The arrangement of the ring-shaped protrusion can increase the creepage distance between the winding and the part of the magnetic core arranged outside the support, thereby reducing the possibility of short circuit between the winding and the part of the magnetic core arranged outside the support.

[0034] In this example, the annular protrusion protrudes from the surface of the base away from the original side winding, which can enable the annular protrusion to separate the end of the original side winding away from the base and the part of the magnetic core outside the bracket, so as to reduce or avoid the possibility of short circuit between the end of the original side winding away from the base and the part of the magnetic core outside the bracket.

[0035] The first folded edge can increase the creepage distance between the end of the original side winding close to the base and the part of the magnetic core outside the bracket, so as to reduce or avoid the possibility of short circuit between the end of the original side winding close to the base and the part of the magnetic core outside the bracket.

[0036] The second folded edge and the third folded edge can increase the creepage distance between the two ends of the original side winding in the extension direction of the first folded edge and the part of the magnetic core outside the bracket, so as to reduce or avoid the possibility of short circuit between the two ends of the original side winding in the extension direction of the first folded edge and the part of the magnetic core outside the bracket.

[0037] In this example, since the first secondary side winding and the second secondary side winding are located between the original side winding and the bracket, the annular protrusion increases the creepage distance between the original side winding and the part of the magnetic core outside the bracket, and by analogy, also increases the creepage distance between the first secondary side winding and the part of the magnetic core outside the bracket and the creepage distance between the second secondary side winding and the part of the magnetic core outside the bracket, i.e., reduces or avoids the possibility of short circuit between the end of the first secondary side winding away from the base and the part of the magnetic core outside the bracket and the possibility of short circuit between the end of the second secondary side winding away from the base and the part of the magnetic core outside the bracket, so as to improve the safety and reliability of the magnetic integrated structure.

[0038] In some examples, the bracket is provided with an annular protrusion at each end in the first direction, so as to increase the creepage distance between the winding located at each end in the first direction and the part of the magnetic core outside the bracket, and improve the safety and reliability of the magnetic integrated structure.

[0039] In some examples, the annular protrusion is provided with a protruding block away from the surface of the original side winding, and the surface of the protruding block facing the magnetic core abuts against the side wall of the magnetic core.

[0040] The protruding block can play a role of installation and positioning of the magnetic core. For example, the position of the second magnetic core can be limited by the protruding block, so as to facilitate the fixation of the magnetic core. In order to better fix the magnetic core, the protruding block and the magnetic core can be bonded by fixing glue after the magnetic core abuts against the protruding block.

[0041] In addition, the protrusion can also guide the magnetic core. For example, the magnetic core includes a first magnetic core and a second magnetic core, the first magnetic core is arranged in the first channel, and the second magnetic core is inserted between the first flange, the second flange and the third flange in a direction perpendicular to the first magnetic core. In this case, the surface of the protrusion facing the second magnetic core can guide the installation of the second magnetic core, so as to facilitate the connection of the second magnetic core and the first magnetic core.

[0042] In some examples, the protrusion can include one. For example, the magnetic core is located between the protrusion and the second flange, and the magnetic core is in abutment with the protrusion and the second flange, respectively.

[0043] In other examples, the protrusion can also include multiple. For example, the protrusion includes two, and the magnetic core is in abutment with the two protrusions, respectively.

[0044] In this example, any one of the first flange, the second flange and the third flange can also be provided with a protrusion, and the setting mode and advantages of the protrusion have been described above, which will not be repeated here.

[0045] In an optional embodiment, the side of the support away from the base is provided with a first connecting column and a second connecting column, and the first connecting column and the second connecting column are located at opposite ends of the support in the first direction. The first connecting column is connected with the end of the first auxiliary side winding. The second connecting column is connected with the end of the second auxiliary side winding.

[0046] The first connecting column is connected with the end of the first auxiliary side winding, the second connecting column is connected with the end of the second auxiliary side winding, and the first connecting column and the second connecting column are located at opposite ends of the support in the first direction, so that the end of the first auxiliary side winding and the end of the second auxiliary side winding have a larger spacing. This spacing can reduce the interference degree between the circuit in which the first auxiliary side winding is energized and the circuit in which the second auxiliary side winding is energized, so as to ensure that the circuit in which the first auxiliary side winding is energized and the circuit in which the second auxiliary side winding is energized can normally operate, and improve the operation reliability.

[0047] In some examples, the end of the first auxiliary side winding includes two, and therefore the first connecting column also includes two. Each end of the first auxiliary side winding is connected with one first connecting column.

[0048] Similarly, the end of the second auxiliary side winding includes two, and therefore the second connecting column also includes two. Each end of the second auxiliary side winding is connected with one second connecting column.

[0049] In an optional embodiment, the size of the end of the support away from the base in the first direction is smaller than the size of the end of the support close to the base in the first direction.

[0050] That is, the size of the support in the first direction is increased. Since the first sub-coil and the second sub-coil are sequentially arranged on the outer circumferential surface of the support in the first direction, and there is a gap between the first sub-coil and the second sub-coil, by increasing the size of the support in the first direction, the gap between the first sub-coil and the second sub-coil can be increased, so that the distance between the first sub-coil and the second sub-coil meets the safety specifications and standard requirements (such as electrical clearance, creepage distance, and other safety specifications and standard requirements).

[0051] Since the first connecting column and the second connecting column are located on the side of the support close to the base, and the first connecting column and the second connecting column are respectively located on the opposite ends of the support in the first direction. By increasing the size of the end of the support close to the base in the first direction, the distance between the first connecting column and the second connecting column and the adjacent coil can be increased, so that the distance between the first connecting column and the second connecting column and the adjacent coil meets the safety specifications and standard requirements (such as electrical clearance, creepage distance, and other safety specifications and standard requirements).

[0052] In some examples, the size of the base in the first direction is consistent with the size of the end of the support close to the base in the first direction, that is, the size of the base in the first direction is also increased, so that when the primary coil includes multiple primary coils, the distance between each two primary coils can be ensured to meet the safety specifications and standard requirements.

[0053] In an optional embodiment, one of the support and the base is provided with a second protrusion, and the other is provided with a second recess, the second protrusion is accommodated in the second recess, and the second protrusion is connected with the second recess.

[0054] By accommodating the second protrusion in the second recess, and connecting the second protrusion with the second recess, the connection between the support and the base is achieved.

[0055] In some examples, the second protrusion is arranged on the support, and the second recess is arranged on the base. The surface of the second protrusion facing the base is connected, such as bonded, with one groove wall of the second recess, and the surface of the second protrusion away from the base is connected, such as bonded, with another groove wall of the second recess.

[0056] In this example, the second protrusion can include two, the two second protrusions are arranged on the outer circumferential surface of the bracket, the two second protrusions are located on the side of the bracket close to the base, and the two second protrusions are oppositely arranged in a direction perpendicular to the first direction. Each second protrusion is accommodated in a second groove. The second groove includes a groove bottom wall and two oppositely arranged groove walls, and the second groove is provided with an opening at one end away from the original edge winding in the first direction. The second protrusion is located between the two groove walls, and the second protrusion respectively abuts against the two groove walls. The opening can allow the second protrusion to be inserted into the second groove. The groove bottom wall can block the second protrusion from moving in a direction close to the groove bottom wall. The two oppositely arranged groove walls can block the second protrusion from moving towards any one of the groove walls.

[0057] In other examples, the second protrusion is arranged on the base, and the second groove is arranged on the bracket. The surface of the second protrusion facing the bracket is connected, such as bonded, to one groove wall of the second groove, and the surface of the second protrusion away from the bracket is connected, such as bonded, to the other groove wall of the second groove.

[0058] In this example, the second groove can include two, the two second grooves are arranged on the outer circumferential surface of the bracket, the two second grooves are located on the side of the bracket close to the base, and the two second grooves are oppositely arranged in a direction perpendicular to the first direction. Each second groove contains a second protrusion. The second groove includes a groove bottom wall and two oppositely arranged groove walls, and the second groove is provided with an opening at one end away from the original edge winding in the first direction. The second protrusion is located between the two groove walls, and the second protrusion respectively abuts against the two groove walls. The opening can allow the second protrusion to be inserted into the second groove. The groove bottom wall can block the second protrusion from moving in a direction close to the groove bottom wall. The two oppositely arranged groove walls can block the second protrusion from moving towards any one of the groove walls.

[0059] In an optional implementation, the surface of the base facing the bracket is provided with a third groove; and a part of the original edge winding is accommodated in the third groove.

[0060] A part of the original edge winding is accommodated in the third groove, and the original edge winding slides on the base along the axis of the first channel to abut against one side wall of the third groove, and the side wall can abut against the original edge winding to block the original edge winding from sliding along the axis of the first channel. In some examples, the two side walls of the third groove can be arranged to respectively abut against the two ends of the original edge winding in the axis of the first channel to limit the original edge winding in the first ring groove, further reduce the possibility of the original edge winding moving along the first channel, and thus prevent the original edge winding from sliding on the base to reduce the distance between the original edge windings or between the original edge winding and the secondary edge winding, resulting in short circuit.

[0061] The number, shape, and position of the third grooves can be selectively designed according to the number, shape, and position of the primary winding groups. For example, the primary module includes a first positive primary winding group, a second positive primary winding group, and a negative primary winding group, which are sequentially and spaced apart on the base along the first channel axis. Correspondingly, the third grooves can include three, which are sequentially and spaced apart on the bracket along the first channel axis. The first positive primary winding group, the second positive primary winding group, and the negative primary winding group are respectively accommodated in the respective third grooves.

[0062] In some examples, the bottom wall of the third groove is provided with a first hole for the end of the primary winding group to pass through.

[0063] The first hole can facilitate the end of the primary winding group to pass through the base to extend to the side of the base away from the bracket, thereby facilitating the connection of the primary winding group with external elements. When the primary winding group includes multiple primary winding groups, the ends of the multiple primary winding groups can be located on the same side of the base, avoiding electromagnetic interference between the wire harness connected to the primary winding group and the secondary winding group or the magnetic core.

[0064] In an alternative embodiment, the magnetic core includes a first magnetic core and a second magnetic core, and a portion of at least one of the first magnetic core and the second magnetic core is arranged in the first channel. The first magnetic core and the second magnetic core are arranged opposite to each other along a direction from the base to the bracket, and an air gap is arranged between the first magnetic core and the second magnetic core.

[0065] The air gap can reduce the magnetic permeability of the first magnetic core and the second magnetic core, and increase the saturation magnetization of the first magnetic core and the second magnetic core, thereby avoiding magnetic saturation of the first magnetic core and the second magnetic core during operation.

[0066] In some examples, the first magnetic core is an I-shaped magnetic core, and the second magnetic core is a U-shaped magnetic core. The first magnetic core can be arranged in the first channel, and the two ends of the first magnetic core are respectively located outside the bracket. Since the first magnetic core is an I-shaped magnetic core, which can be understood as a long strip-shaped magnetic core, the inner diameter of the first channel is matched with the outer diameter of the first magnetic core during design, without the need to consider additional clearance space. Therefore, the size of the first channel can be smaller, i.e., the occupied space of the bracket can be smaller, thereby making the magnetic integrated structure more compact and occupying less space.

[0067] In some examples, the first magnetic core and the second magnetic core are both U-shaped magnetic cores. The end of the first magnetic core and the end of the second magnetic core can be arranged in the first channel, and the two ends are arranged opposite to each other in the first direction. This not only provides a larger installation space for the primary winding, the first secondary winding, the second secondary winding and the support, but also enables the first magnetic core and the second magnetic core to be designed as the same structure, so that the assembly position of the first magnetic core and the second magnetic core does not need to be considered during installation, reducing assembly errors and design and processing costs.

[0068] In an optional embodiment, the first secondary winding and the second secondary winding each have a gap with the primary winding. The primary winding includes a first positive electric primary winding, a second positive electric primary winding and a negative electric primary winding. Along the first channel axis, the first positive electric primary winding, the second positive electric primary winding and the negative electric primary winding are sequentially and spaced apart on the base.

[0069] Since the primary winding and the secondary winding are in contact, short circuiting can cause local overheating and even fire. Therefore, the gap between the first secondary winding and the primary winding and the gap between the second secondary winding and the primary winding can prevent the first secondary winding from directly contacting the primary winding and the second secondary winding from directly contacting the primary winding, thereby preventing short circuiting and ensuring the safety of the circuit between the first secondary winding and the primary winding and the circuit between the second secondary winding and the primary winding.

[0070] In order to prevent short circuiting due to a too small gap, the gap between the first secondary winding and the primary winding and the gap between the second secondary winding and the primary winding should meet the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.).

[0071] In addition, in order to avoid short circuiting due to a too small gap between the primary windings, the distance between the first positive electric primary winding, the second positive electric primary winding and the negative electric primary winding should meet the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.).

[0072] In an optional embodiment, the number of turns of the first positive electric primary winding, the second positive electric primary winding and the negative electric primary winding is the same. The sum of the number of turns of the first positive electric primary winding and the number of turns of the second positive electric primary winding is equal to the number of turns of the second secondary winding.

[0073] It can be understood that the number of turns of the second secondary winding is twice the number of turns of the first positive electric primary winding, and the number of turns of the second secondary winding is also twice the number of turns of the second positive electric primary winding. In this way, the ratio of the number of turns of the second secondary winding to the number of turns of the primary winding is 1.

[0074] In some examples, the second secondary winding can form a PLC signal transformer with the first positive primary winding, the second positive primary winding, and the negative primary winding, and the PLC signal transformer can be an N:N transformer to ensure the accuracy and effectiveness of the PLC communication signal transmission.

[0075] In an alternative embodiment, the first positive primary winding, the second positive primary winding, and the negative primary winding have different numbers of turns. The sum of the number of turns of the first positive primary winding, the number of turns of the second positive primary winding, and the number of turns of the negative primary winding is equal to the number of turns of the second secondary winding.

[0076] In this way, the ratio of the number of turns of the second secondary winding to the number of turns of the primary winding can be 1.

[0077] In some examples, the second secondary winding can form a PLC signal transformer with the first positive primary winding, the second positive primary winding, and the negative primary winding, and the PLC signal transformer can be an N:N transformer to ensure the accuracy and effectiveness of the PLC communication signal transmission.

[0078] In a second aspect, the application provides a power conversion device. The power conversion device includes a housing and the above-described magnetic integrated structure, and the magnetic integrated structure is located in the housing. The first secondary winding is configured to output a first induced current. The second secondary winding is configured to output a second induced current with a power line carrier communication signal.

[0079] That is, the magnetic integrated structure is part of the power conversion device. The housing can protect the magnetic integrated structure.

[0080] The primary winding is a winding configured to receive an external current input (for example, a current transmitted from a photovoltaic module to the magnetic integrated structure in the power conversion device). The primary winding transmits the input electrical energy to the first secondary winding and the second secondary winding through electromagnetic induction. In the case where the primary winding is energized, the first secondary winding can output a first induced current according to the current in the primary winding according to the principle of electromagnetic induction. The second secondary winding can output a second induced current with a power line carrier communication signal according to the current in the primary winding.

[0081] It can be understood that the primary winding, the first secondary winding, the first magnetic core, and the second magnetic core together form a current transformer. That is, the first induced current output by the first secondary winding can be transmitted to a subsequent arc fault detection element to detect an arc fault characteristic signal in the first induced current. If the arc fault characteristic signal exists in the first induced current, the power supply circuit can be disconnected before the arc fault develops into a fire or a short circuit occurs in the circuit, thereby reducing the possibility of the arc fault causing a fire.

[0082] The primary side winding, the second secondary side winding, the first magnetic core and the second magnetic core jointly constitute the PLC signal transformer. That is, the second induced current with the power line carrier communication signal output by the second secondary side winding, that is, the second induced current with the PLC communication signal can be transmitted to subsequent devices to realize transmission of the PLC communication signal.

[0083] In an alternative embodiment, the primary side winding comprises a first positive primary side winding, a second positive primary side winding and a negative primary side winding. The differential mode current direction of the first positive primary side winding, the differential mode current direction of the second positive primary side winding and the differential mode current direction of the negative primary side winding are the same.

[0084] The differential mode current direction of the first positive primary side winding can be understood as the direction of the differential mode current when the first positive primary side winding is passed through the differential mode current. The differential mode current direction of the second positive primary side winding can be understood as the direction of the differential mode current when the second positive primary side winding is passed through the differential mode current. The differential mode current direction of the negative primary side winding can be understood as the direction of the differential mode current when the negative primary side winding is passed through the differential mode current.

[0085] The differential mode current direction of the first positive primary side winding, the differential mode current direction of the second positive primary side winding and the differential mode current direction of the negative primary side winding are the same. According to the right-hand screw rule, the magnetic flux direction of the first positive primary side winding, the magnetic flux direction of the second positive primary side winding and the magnetic flux direction of the negative primary side winding are the same. The magnetic fluxes can be superimposed to enhance the differential mode signal.

[0086] In addition, the differential mode current direction of the first positive primary side winding, the differential mode current direction of the second positive primary side winding and the differential mode current direction of the negative primary side winding are the same, which can be understood as the common mode current direction of the first positive primary side winding and the common mode current direction of the second positive primary side winding are the same, and the common mode current direction of the first positive primary side winding and the common mode current direction of the negative primary side winding are opposite. According to the right-hand screw rule, the magnetic flux direction of the first positive primary side winding is the same as the magnetic flux direction of the second positive primary side winding, and the magnetic flux direction of the first positive primary side winding is opposite to the magnetic flux direction of the negative primary side winding. The magnetic flux of the negative primary side winding can partially or completely offset the magnetic flux of the first positive primary side winding and the magnetic flux of the second positive primary side winding, so that the common mode noise signal is suppressed or offset.

[0087] In addition, the power conversion device provided by the present application comprises the above-mentioned magnetic integrated structure, so the power conversion device provided by the present application and the magnetic integrated structure of the above-mentioned technical solution can solve the same technical problems and have the same technical effects, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0088] Figure 1 A schematic diagram of a photovoltaic power generation system provided by an embodiment of the present application;

[0089] Figure 2 A schematic diagram of a power conversion device provided in an embodiment of this application;

[0090] Figure 3 This is a partial structural diagram of a magnetic integrated structure provided in an embodiment of this application;

[0091] Figure 4 for Figure 3 A schematic diagram of a magnetic integrated structure, showing the differential mode current;

[0092] Figure 5 for Figure 3 A schematic diagram of a magnetic integrated structure, illustrating the common-mode current;

[0093] Figure 6 for Figure 3 A partial structural diagram of the magnetic integrated structure from another angle, with the first and second magnetic cores removed;

[0094] Figure 7 for Figure 3 A schematic diagram of the structure of the first and second magnetic cores in the magnetic integrated structure;

[0095] Figure 8 for Figure 3 The schematic diagram of the support structure of the magnetic integrated structure shows the first secondary side winding, the second secondary side winding, and the third secondary side winding;

[0096] Figure 9 for Figure 3 An exploded view of the support structure of the magnetic integrated structure in the image, with the first secondary side winding, the second secondary side winding, and the third secondary side winding removed;

[0097] Figure 10 for Figure 3 A partial structural diagram of the magnetic integrated structure from another angle, with the first secondary winding, the second secondary winding, and the third secondary winding removed;

[0098] Figure 11 for Figure 3 The schematic diagram of the magnetic integrated structure in the figure shows the support and base in a state of being ready to be connected, with the first secondary side winding, the second secondary side winding and the third secondary side winding removed;

[0099] Figure 12 for Figure 3 A schematic diagram of the base of the magnetic integrated structure.

[0100] Figure label:

[0101] 100 - photovoltaic power generation system; 10 - photovoltaic module; 101 - photovoltaic panel; 20 - photovoltaic optimizer; 30 - power conversion device; 301 - housing; 40 - electrical equipment;

[0102] 01 - magnetic integrated structure; 1 - magnetic core; 11 - first magnetic core; 12 - second magnetic core; 13 - cavity; 14 - air gap;

[0103] 2 - primary winding; 21 - first positive electric primary winding; 22 - second positive electric primary winding; 23 - negative electric primary winding;

[0104] 31 - first secondary winding; 32 - second secondary winding; 33 - third secondary winding;

[0105] 4 - bracket; 41 - first part; 42 - second part; 43 - clamping structure; 431 - first protrusion; 432 - first groove; 44 - second protrusion; 451 - first ring groove; 452 - second ring groove; 453 - third ring groove; 46 - annular protrusion; 461 - first flange; 462 - second flange; 463 - third flange; 47 - protrusion; 48 - third protrusion;

[0106] 5 - base; 51 - second groove; 511 - groove wall; 512 - groove bottom wall; 513 - opening; 52 - third groove; 53 - first hole;

[0107] 61 - first connecting column; 62 - second connecting column; 63 - third connecting column;

[0108] 71 - first channel; 72 - second channel. DETAILED DESCRIPTION

[0109] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application.

[0110] In the present application, unless otherwise explicitly specified and limited, the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right" and the like can include but not limited to the orientation defined by the relative placement of the components in the drawings, wherein these directional terms can be a relative concept, which are used for relative description and clarification, and can be changed accordingly according to the change of the placement of the components in the drawings, and cannot be understood as a limitation on the present application.

[0111] In the present application, the terms "first", "second", etc. are used only for descriptive purposes, and are not to be construed as implying or suggesting relative importance or an implied order of the technical features indicated. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0112] In the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0113] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing pipelines or channels, "connecting" and "connection" used in the present application have the meaning of conducting. The specific meaning should be understood in combination with the context.

[0114] In the present application, unless otherwise explicitly specified and limited, the term "coupling" should be understood broadly, for example, "coupling" can be a direct electrical connection between two components, for example, physical contact and electrical conduction between two elements, or can be understood as electrical connection between different elements in the circuit structure through the entity circuit of copper foil or wire of printed circuit board (PCB) that can transmit electrical signals, to transmit electrical signals; or "coupling" can be an indirect electrical connection between two elements through an intermediate medium; or "coupling" can be an electrical connection between two elements through a non-contact / empty space, for example, two elements are electrically connected in a capacitive coupling, inductive coupling or resistive coupling manner to transmit electrical signals. In addition, in the embodiments of the present application, the term "decoupling" means that there is no direct or indirect electrical connection between two components, so that there is no electrical signal transmission between the two components decoupled.

[0115] In addition, in the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be construed as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present relevant concepts in a concrete manner.

[0116] In the drawings of the embodiments of the present application, the entity structures of components, assemblies, etc. are represented by guide lines; the hollow structures of openings, holes, spaces, cavities, etc. are represented by guide lines with arrows.

[0117] The photovoltaic power generation system provided by the embodiments of the present application is a power generation system that directly converts solar radiation energy into electric energy by using the photovoltaic effect of a photovoltaic cell.

[0118] Figure 1 An exemplary schematic diagram of a photovoltaic power generation system 100 is shown. Referring to Figure 1 The photovoltaic power generation system 100 includes a photovoltaic (PV) assembly 10, a photovoltaic optimizer 20, and a power conversion device 30. The input end of the photovoltaic optimizer 20 is connected to the photovoltaic assembly 10, and the output end of the photovoltaic optimizer 20 is connected to the power conversion device 30.

[0119] The photovoltaic assembly 10 can convert solar energy into direct current (DC) electric energy. The photovoltaic optimizer 20 is also called a photovoltaic power optimizer or an assembly power optimizer. The photovoltaic optimizer 20 is connected to the photovoltaic assembly 10, such as being connected in series, and can track the maximum power point (MPPT) of the photovoltaic assembly 10 in real time, reduce the possibility of reducing the power generation of the photovoltaic power generation system caused by shadow blocking, assembly orientation difference, or inconsistent assembly attenuation, and ensure the power generation of the photovoltaic power generation system.

[0120] In this example, the photovoltaic assembly 10 can be a single photovoltaic panel 101. The photovoltaic assembly 10 can also be a photovoltaic string, that is, a plurality of photovoltaic panels 101 connected in series. When the photovoltaic assembly 10 is a photovoltaic string, the number of photovoltaic optimizers 20 can be the same as and one-to-one corresponding to the number of photovoltaic panels 101, that is, each photovoltaic panel 101 is connected to one photovoltaic optimizer 20. The number of photovoltaic optimizers 20 can also be different from the number of photovoltaic panels 101, for example, a plurality (two or more) of photovoltaic panels 101 share one photovoltaic optimizer 20. The embodiments of the present application do not make specific limitations on the specific form of the photovoltaic assembly 10 and the connection form of the photovoltaic assembly 10 and the photovoltaic optimizer 20.

[0121] The power conversion device 30 can convert the direct current (DC) output by the photovoltaic optimizer 20 into another form of electric energy. For example, in some examples, the power conversion device 30 can be a direct current- alternating current converter, that is, a DC-AC converter. For example, an inverter, which can convert the direct current output by the photovoltaic optimizer 20 into alternating current (AC) to power the electric device 40 (such as a battery in an alternating current grid, a communication base station, or a household device).

[0122] In some examples, the power conversion device 30 is an AC-DC converter. The AC-DC converter is capable of converting the AC power outputted by the photovoltaic optimizer 20 into DC power having a different voltage value, such as a lower voltage value. Alternatively, the AC-DC converter is capable of converting the AC power outputted by the photovoltaic optimizer 20 into DC power having a higher voltage value.

[0123] In this example, the working principle, structure and connection form of the photovoltaic module 10, the photovoltaic optimizer 20 and the power conversion device 30 are well known to those skilled in the art, and will not be described here in detail.

[0124] The above is an example in which the power conversion device 30 is applied to the photovoltaic power generation system 100. In other embodiments of the present application, the power conversion device 30 can also be applied to other fields, such as the vehicle field, and the power conversion device 30 can also be other forms of power conversion devices, such as an AC-DC converter. The specific form of the power conversion device 30 is not specially limited in the embodiments of the present application.

[0125] Figure 2 An exemplary schematic diagram of the power conversion device 30 applied to the above photovoltaic power generation system 100 is shown as an inverter. Referring to Figure 2 , the power conversion device 30 includes a housing 301 and a magnetic integrated structure 01 (as shown in the dashed box in Figure 2 ) located in the housing 301. The magnetic integrated structure 01 integrates a current transformer and a PLC (Power Line Carrier) signal transformer together.

[0126] Referring to Figure 1 and Figure 2 , the current transformer is used to detect arc fault characteristic signals on the output line of the photovoltaic module 10. That is, the current transformer inductively detects possible arc in the output line, forms an AFCI (Arc-Fault Circuit Interrupter) arc noise inductive current signal, and compares and analyzes the AFCI arc noise inductive current signal in combination with an AFCI peripheral circuit to determine whether there is an arc fault (such as a draw arc) on the output line of the photovoltaic module 10. If there is an arc fault, the power supply circuit can be disconnected before the arc fault develops into a fire or a short circuit in the circuit, reducing the possibility of a fire caused by an arc fault.

[0127] Referring to Figure 1 and Figure 2The PLC signal transformer is used to receive the PLC communication signal from the photovoltaic optimizer 20, that is, the PLC signal transformer senses and detects the power line carrier communication signal in the output line of the photovoltaic module 10, and combines the PLC peripheral circuit to complete the modulation or demodulation of the power line carrier communication signal, so as to realize the PLC communication of the photovoltaic optimizer 20 on the output line of the photovoltaic module 10.

[0128] In this example, compared with the independent setting of the current transformer and the PLC signal transformer, the current transformer and the PLC signal transformer are integrated, which is smaller in size and lighter in weight under the premise of ensuring the AFCI function and the PLC communication function, so as to reduce the occupied space and the weight of the power conversion device 30 with the magnetic integrated structure 01.

[0129] The above is an example of applying the magnetic integrated structure 01 to the inverter. In other embodiments of the present application, the magnetic integrated structure 01 can also be applied to other devices, which can be selectively designed by those skilled in the art according to actual needs.

[0130] Figure 3 The partial structure schematic diagram of the magnetic integrated structure 01 is shown in the example. Referring to Figure 3 In the magnetic integrated structure 01, the magnetic integrated structure 01 includes a first magnetic core 11, a second magnetic core 12, a primary winding 2, a first secondary winding 31, a second secondary winding 32, a bracket 4 and a base 5. The first magnetic core 11 and the second magnetic core 12 are connected. A part of the first magnetic core 11 is arranged in the bracket 4. The base 5 is arranged on one side of the bracket 4 along the second direction (the second direction is perpendicular to the first direction). The primary winding 2 is inserted into the base 5, and the bracket 4 passes through the primary winding 2. The first secondary winding 31 and the second secondary winding 32 are sequentially arranged on the outer circumferential surface of the bracket 4 along the first direction, and there is a gap between the first secondary winding 31 and the second secondary winding 32. The first secondary winding 31 and the second secondary winding 32 are located between the primary winding 2 and the bracket 4 along the second direction.

[0131] In this example, when the magnetic integrated structure 01 is applied to the power conversion device described above, and the primary winding 2 is energized, the primary winding is used to receive the winding input by the external current (such as the current from the photovoltaic module to the magnetic integrated structure 01 in the power conversion device). The primary winding transmits the input electric energy to the first secondary winding and the second secondary winding through the principle of electromagnetic induction. According to the principle of electromagnetic induction, the first secondary winding 31 can couple the first induced current according to the current in the primary winding 2. The second secondary winding 32 can couple the second induced current with the power line carrier communication signal according to the current in the primary winding 2.

[0132] It can be understood that the primary winding 2, the first secondary winding 31, the first magnetic core 11 and the second magnetic core 12 jointly constitute a current transformer. That is, the first induced current output by the first secondary winding 31 can be transmitted to a subsequent arc fault detection element to detect the arc fault characteristic signal in the first induced current. If the arc fault characteristic signal exists in the first induced current, the power supply circuit can be disconnected before the arc fault develops into a fire or a short circuit occurs in the circuit, thereby reducing the possibility of a fire caused by the arc fault.

[0133] The primary winding 2, the second secondary winding 32, the first magnetic core 11 and the second magnetic core 12 jointly constitute a PLC signal transformer. That is, the second induced current output by the second secondary winding 32, that is, the second induced current with the PLC communication signal, can be transmitted to a subsequent device to realize transmission of the PLC communication signal.

[0134] In order to avoid signal interference, the detection frequency of the first secondary winding 31 and the detection frequency of the second secondary winding 32 do not overlap. It can be understood that the arc detection frequency range is (a, b), the PLC working frequency range is (c, d), and the intersection of (a, b) and (c, d) is an empty set.

[0135] For example, the detection frequency of the first secondary winding 31 is 20 kHz to 60 kHz, and the detection frequency of the second secondary winding 32 is 70 kHz to 150 kHz. The two frequency bands do not overlap and do not interfere with each other.

[0136] In some examples, with reference to Figure 3 A third secondary winding 33 is also provided on the outer circumferential surface of the support 4. In the first direction, the first secondary winding 31, the second secondary winding 32 and the third secondary winding 33 are sequentially provided on the outer circumferential surface of the support 4. The third secondary winding 33 is used to output a third induced current.

[0137] In some examples, the number of turns of the third secondary winding 33 is less than the number of turns of the first secondary winding 31. For example, the first secondary winding 31 can be a detection winding, and the third secondary winding 33 can be a self-checking winding, thereby improving the detection accuracy. The working principle and connection form of the self-checking winding and the detection winding are well known to those skilled in the art, and will not be described here.

[0138] In other examples, the number of turns of the third secondary winding 33 can be greater than the number of turns of the first secondary winding 31 to detect other signals. The present application does not make specific limitations on this.

[0139] The third secondary winding 33 is provided in the same manner as the first secondary winding 31, and therefore will not be described here.

[0140] With reference to Figure 3, a part of the first magnetic core 11 is arranged in the support 4. In the first direction, the second auxiliary side winding 32, the first auxiliary side winding 31 and the third auxiliary side winding 33 are sequentially arranged on the outer circumferential surface of the support 4. That is, the first auxiliary side winding 31, the second auxiliary side winding 32 and the third auxiliary side winding 33 are not directly arranged on the first magnetic core 11, but are indirectly arranged on the first magnetic core 11 through the support 4. When winding, the first auxiliary side winding 31, the second auxiliary side winding 32 and the third auxiliary side winding 33 can be arranged on the support 4 first, and then the first magnetic core 11 is arranged through the support 4, so that the first auxiliary side winding 31 and the second auxiliary side winding 32 are indirectly arranged on the first magnetic core 11.

[0141] In the second direction, the base 5 is arranged on one side of the support 4, the original side winding 2 is arranged in the base 5, and the support passes through the original side winding 2. That is, the original side winding 2 is neither directly arranged on the support 4, nor directly arranged on the first magnetic core 11 and the second magnetic core 12. When winding, the original side winding 2 can be arranged in the base 5 first, and then the support 4 is arranged through the original side winding 2. Since the first magnetic core 11 is arranged in the support 4, the original side winding 2 can be indirectly arranged on the first magnetic core 11.

[0142] The gap is arranged between the first auxiliary side winding 31 and the second auxiliary side winding 32. The arrangement of the gap can increase the creepage distance between the first auxiliary side winding 31 and the second auxiliary side winding 32, thereby reducing or avoiding the possibility of short circuit due to too small distance between the first auxiliary side winding 31 and the second auxiliary side winding 32, and facilitating to improve the safety and reliability of the magnetic integrated structure 01.

[0143] Similarly, the second auxiliary side winding 32 and the third auxiliary side winding 33 also have a gap therebetween, and the arrangement of the gap can increase the creepage distance between the third auxiliary side winding 33 and the second auxiliary side winding 32, thereby reducing or avoiding the possibility of short circuit due to too small distance between the third auxiliary side winding 33 and the second auxiliary side winding 32, and facilitating to improve the safety and reliability of the magnetic integrated structure 01.

[0144] When the magnetic integrated structure 01 is installed, the original side winding 2 can be arranged in the base 5, the first auxiliary side winding 31, the second auxiliary side winding 32 and the third auxiliary side winding 33 can be sequentially arranged on the outer circumferential surface of the support 4 in the first direction, and then the support 4 is arranged through the original side winding 2. After the arrangement, the first auxiliary side winding 31, the second auxiliary side winding 32 and the third auxiliary side winding 33 are located between the original side winding 2 and the support 4. Then, the first magnetic core 11 is arranged through the support 4, and the first magnetic core 11 and the support 4 are connected. Finally, the first magnetic core 11 and the second magnetic core 12 are connected to complete the assembly of the magnetic integrated structure 01.

[0145] The winding of the primary winding 2, the first secondary winding 31, the second secondary winding 32 and the third secondary winding 33 can be performed before the magnetic integration structure 01 is assembled, so that there is enough winding space when the primary winding 2, the first secondary winding 31, the second secondary winding 32 and the third secondary winding 33 are wound, and thus the automatic winding of the primary winding 2, the first secondary winding 31, the second secondary winding 32 and the third secondary winding 33 can be realized, which is more time-saving and labor-saving than the manual winding method, and is convenient for popularization on the production line.

[0146] In addition, the insertion of the primary winding 2 on the base 5, the connection of the support 4 and the base 5, the insertion of the first magnetic core 11 in the support 4, and the connection of the first magnetic core 11 and the second magnetic core 12 can all be realized through automatic operations such as hanging and tin soldering, so that the automatic assembly of the magnetic integration structure 01 can be realized, so as to complete a large number of assembly tasks in a short time, shorten the production cycle, and improve the production efficiency.

[0147] In other examples of the present application, a part of the second magnetic core 12 can be inserted in the support 4, that is, the second magnetic core 12 passes through the support 4, and the two ends of the second magnetic core 12 are located outside the support 4, respectively. Alternatively, the two opposite ends between the first magnetic core 11 and the second magnetic core 12 can also be inserted in the support 4, for example, the first magnetic core 11 includes an end portion a, the second magnetic core 12 includes an end portion b, the end portion a and the end portion b are oppositely arranged in the first direction, and the end portion a and the end portion b are both inserted in the support 4. The present application does not make specific limitations thereon. Those skilled in the art can selectively design according to actual needs.

[0148] Since the contact between the primary winding 2 and the first secondary winding 31 will cause short circuit, the short circuit may cause local overheating, and even cause fire. Therefore, the gap between the first secondary winding 31 and the primary winding 2 can prevent the first secondary winding 31 from directly contacting the primary winding 2 to cause short circuit, and ensure the safety of the circuit between the first secondary winding 31 and the primary winding 2.

[0149] In order to prevent short circuit caused by too small gap, the gap between the first secondary winding 31 and the primary winding 2 should meet the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.).

[0150] Similarly, the second secondary winding 32 and the primary winding 2 have a gap, and the third secondary winding 33 and the primary winding 2 also have a gap, which will not be described herein.

[0151] Referring to Figure 3 , the primary winding 2 includes a first positive electric primary winding 21, a second positive electric primary winding 22 and a negative electric primary winding 23, referring to Figure 1 and Figure 3, the first positive primary winding 21 and the second positive primary winding 22 are used for connecting with the positive output end of the photovoltaic module 10, and the negative primary winding 23 is used for connecting with the negative output end of the photovoltaic module 10. In order to avoid short circuit caused by too small gap between the primary windings, the gap between the first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 should be set according to the safety specifications and standards (such as electrical clearance, creepage distance and other safety specifications and standards).

[0152] In other embodiments of the present application, the positive primary windings of the primary winding 2 can also include three or more, which is not specifically limited in the present application, and can be selectively designed by those skilled in the art according to actual needs.

[0153] Figure 4 An exemplary schematic diagram of the above magnetic integration structure 01 is shown, wherein the primary winding 2 passes differential mode current. Referring to Figure 4 , the differential mode current of the first positive primary winding 21 is I1, the differential mode current of the second positive primary winding 22 is I2, and the differential mode current of the negative primary winding 23 is I3, and the directions of the differential mode current I1, the differential mode current I2 and the differential mode current I3 are the same.

[0154] According to the right-hand screw rule, the magnetic flux of the first positive primary winding 21 is Φ1, the magnetic flux of the second positive primary winding 22 is Φ2, and the magnetic flux of the negative primary winding 23 is Φ3, the directions of the magnetic flux Φ1, the magnetic flux Φ2 and the magnetic flux Φ3 are the same, and all are counterclockwise. The magnetic fluxes can be superimposed to enhance the differential mode signal.

[0155] Figure 5 An exemplary schematic diagram of the above magnetic integration structure 01 is shown, wherein the primary winding 2 passes common mode current. Referring to Figure 5 , the common mode current of the first positive primary winding 21 is I4, the common mode current of the second positive primary winding 22 is I5, and the common mode current of the negative primary winding 23 is I6, and the directions of the common mode current I4 and the common mode current I5 are the same, and the directions of the common mode current I4 and the common mode current I6 are opposite.

[0156] According to the right-hand screw rule, the magnetic flux of the first positive primary winding 21 is Φ4, the magnetic flux of the second positive primary winding 22 is Φ5, and the magnetic flux of the negative primary winding 23 is Φ6, the directions of the magnetic flux Φ1 and the magnetic flux Φ2 are the same, and all are counterclockwise, and the direction of the magnetic flux Φ1 and the magnetic flux Φ3 is opposite, that is, the direction of the magnetic flux Φ3 is clockwise. The magnetic flux Φ3 can partially or completely offset the magnetic flux Φ1 and the magnetic flux Φ2, therefore, the common mode noise signal is suppressed or offset.

[0157] In some examples, the number of turns of the first positive electric primary winding 21, the second positive electric primary winding 22 and the negative electric primary winding 23 are the same. The sum of the number of turns of the first positive electric primary winding 21 and the number of turns of the second positive electric primary winding 22 is equal to the number of turns of the second secondary winding 32.

[0158] It can be understood that the number of turns of the second secondary winding 32 is twice the number of turns of the first positive electric primary winding 21, and the number of turns of the second secondary winding 32 is also twice the number of turns of the second positive electric primary winding 22. Such a setting can make the ratio of the number of turns of the second secondary winding 32 to the number of turns of the primary winding 2 be 1, that is, the second secondary winding 32 can form a PLC signal transformer with the primary winding 2, which is an N:N transformer, ensuring the accuracy and effectiveness of PLC communication signal transmission.

[0159] In other examples, the number of turns of the first positive electric primary winding 21, the second positive electric primary winding 22 and the negative electric primary winding 23 are different. The sum of the number of turns of the first positive electric primary winding 21 and the number of turns of the second positive electric primary winding 22 is equal to the number of turns of the second secondary winding 32.

[0160] Such a setting can also make the ratio of the number of turns of the second secondary winding 32 to the number of turns of the primary winding 2 be 1, that is, the second secondary winding 32 can form a PLC signal transformer with the primary winding 2, which is an N:N transformer, ensuring the accuracy and effectiveness of PLC communication signal transmission.

[0161] Figure 6 A partial structure schematic diagram of another angle of the above magnetic integration structure is shown. In order to avoid interference, the first magnetic core 11 and the second magnetic core 12 are removed. Figure 3 The first magnetic core 11 and the second magnetic core 12 shown.

[0162] Referring to Figure 3 and Figure 6 , the bracket 4 has a first channel 71, the first channel 71 penetrates through the bracket 4 along a first direction, and a part of the first magnetic core 11 is arranged in the first channel 71. Among them, the first direction is the axial direction of the first channel 71, and the second direction is one of the radial directions of the first channel 71. The first channel 71 can facilitate the penetration of the first magnetic core 11. In order to fix the first magnetic core 11 in the bracket 4, liquid glue can be injected into the first channel 71 after the first magnetic core 11 is penetrated into the first channel 71. The liquid glue can flow along the gap between the first channel 71 and the first magnetic core 11. After the liquid glue solidifies, the first magnetic core 11 can be fixed in the first channel 71. The specific form of the liquid glue can be selected according to actual needs.

[0163] In other embodiments of the present application, the first magnetic core 11 can also be fixed in the bracket by other ways such as clamping, etc., and the present application embodiments do not make special limitations on this.

[0164] In some examples, referring to Figure 6 , the first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 are sequentially and spacedly arranged on the base 5 in the axial direction of the first channel 71. The first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 enclose the second channel 72, the support 4 passes through the second channel 72, and the two ends of the support 4 in the axial direction of the first channel 71 are located outside the second channel 72.

[0165] In order to ensure that the primary winding 2 is indirectly arranged on the first magnetic core 11, the axial direction of the second channel 72 can be parallel or coincident with the axial direction of the first channel 71.

[0166] The support 4 can pass through the second channel 72 in any suitable manner. For example, in some examples, the support 4 is inserted from one end of the second channel 72 in the axial direction and passes out from the other end of the second channel 72 in the axial direction. For another example, in some examples, the support 4 includes two parts, one part is inserted from one end of the second channel 72 in the axial direction, and the other part is inserted from the other end of the second channel 72 in the axial direction.

[0167] Figure 7 The structural schematic diagram of the first magnetic core 11 and the second magnetic core 12 of the above magnetic integrated structure is shown. Referring to Figure 7 , the first magnetic core 11 is an I-shaped magnetic core, and the second magnetic core 12 is a U-shaped magnetic core.

[0168] Referring to Figure 6 and Figure 7 , since the first magnetic core 11 is an I-shaped magnetic core, it can be understood as a long strip-shaped magnetic core. In the design, the inner diameter of the first channel 71 is matched with the outer diameter of the first magnetic core 11, without considering additional avoiding space, so the size of the first channel 71 can be set smaller, that is, the occupied space of the support can be smaller, thereby making the structure of the magnetic integrated structure more compact and occupying smaller space.

[0169] In other examples, the first magnetic core 11 and the second magnetic core 12 can both be U-shaped magnetic cores. In this way, the end of the first magnetic core 11 and the end of the second magnetic core 12 are both arranged in the first channel 71 (as shown in Figure 6 ), and the two ends are oppositely arranged in the axial direction of the first channel 71. Such arrangement not only provides a larger mounting space for the primary winding 2, the first secondary winding 31, the second secondary winding 32 and the support 4 (as shown in Figure 6 ), but also enables the first magnetic core 11 and the second magnetic core 12 to be designed in the same structure, so that the assembly position of the first magnetic core 11 and the second magnetic core 12 does not need to be considered during installation, reducing assembly errors, and also reducing design and processing costs.

[0170] In some examples, referring to Figure 3 and Figure 7 , the first magnetic core 11 and the second magnetic core 12 enclose a cavity 13. The cavity 13 can provide installation space for the bracket 4, the primary winding 2, the first secondary winding 31, the second secondary winding 32 and the third secondary winding 33, and further simplify the assembly process. On the other hand, the first magnetic core 11 and the second magnetic core 12 can jointly act on the magnetic field in the cavity 13, enhancing the strength and directivity of the magnetic field. In addition, the cavity 13 can also form a larger heat dissipation area, which is conducive to heat dissipation.

[0171] In some examples, referring to Figure 7 , the first magnetic core 11 is arranged opposite to the second magnetic core 12, and an air gap 14 is arranged between the first magnetic core 11 and the second magnetic core 12, and the air gap 14 is in communication with the cavity 13.

[0172] The design of the air gap 14 can reduce the magnetic permeability of the first magnetic core 11 and the second magnetic core 12, and increase the saturation magnetization of the first magnetic core 11 and the second magnetic core 12, so as to avoid the magnetic saturation phenomenon of the first magnetic core 11 and the second magnetic core 12 during operation.

[0173] In addition, the first magnetic core 11 and the second magnetic core 12 can be made of any suitable magnetic core material, and the material of the first magnetic core 11 and the second magnetic core 12 is not limited in the present application.

[0174] Figure 8 The structure of the bracket 4 of the above magnetic integration structure is shown. Referring to Figure 8 , the bracket 4 includes a first part 41 and a second part 42 arranged in a first direction (i.e. the axial direction of the first channel 71), the first part 41 and the second part 42 are connected by a clamping structure, and the inner wall of the first part 41 and the inner wall of the second part 42 enclose the first channel 71. Along the axial direction of the first channel 71, the first secondary winding 31 and the third secondary winding 33 are sequentially arranged on the outer peripheral surface of the first part 41. The second secondary winding 32 is arranged on the outer peripheral surface of the second part 42.

[0175] When winding, the first secondary winding 31 and the third winding 33 can be wound on the first part 41 respectively, and the second secondary winding 32 can be wound on the second part 42. Then the first part 41 and the second part 42 are connected by the clamping structure to form the bracket 4. In some examples, the windings on the first part 41 and the windings on the second part 42 can be wound at the same time to improve the assembly efficiency and shorten the production cycle.

[0176] For example, the winding on the first portion 41 is completed by a winding tool, i.e., the winding tool is used to wind the first secondary winding 31 and the third secondary winding 33 on the first portion 41. The winding on the second portion 42 is completed by another winding tool, i.e., the winding tool is used to wind the second secondary winding 32 on the second portion 42. In this way, the winding can be performed simultaneously, thereby improving the assembly efficiency and shortening the production cycle.

[0177] With reference to Figure 6 and Figure 8 , the first portion 41 can be inserted from one end of the primary winding 2 in the first direction, the second portion 42 is inserted from the other end of the primary winding 2 in the first direction, and the portion of the first portion 41 inserted into the second channel 72 and the portion of the second portion 42 inserted into the second channel 72 can be connected by the clamping structure in the second channel 72, which is convenient and fast. Moreover, when designing the support 4 and the second channel 72 of the primary winding 2, the portions of the first portion 41 and the second portion 42 that are not inserted into the primary winding 2 do not need to be considered to avoid the primary winding 2. Similarly, the primary winding 2 also does not need to be considered to avoid the portions of the first portion 41 and the second portion 42 that are not inserted into the primary winding 2. In other words, the support 4 and the primary winding 2 can be smaller in size, i.e., the support 4 and the primary winding 2 can occupy less space, thereby making the magnetic integrated structure 01 more compact and occupying less space.

[0178] In some examples, with reference to Figure 6 and Figure 8 , the support 4 is provided with a ring-shaped protrusion 46 at each end in the first direction. The ring-shaped protrusion 46 protrudes from the primary winding 2 away from the surface of the base 5. Radially along the first channel 71, the edge of the ring-shaped protrusion 46 extends in a direction away from the primary winding 2 to form a first flange 461, a second flange 462, and a third flange 463. The first flange 461 is located on the side of the ring-shaped protrusion 46 close to the base 5, and the first flange 461 is connected between the second flange 462 and the third flange 463.

[0179] Since the magnetic core 1 is an electrically conductive body, a portion of the magnetic core 1 is arranged in the first channel 71 of the support 4, and a portion of the magnetic core 1 is arranged outside the support 4. If the distance between any one of the primary winding 2 and the secondary winding and the portion of the magnetic core 1 arranged outside the support 4 is too small, a short circuit may occur. In order to prevent the winding from short-circuiting with the portion of the magnetic core 1 arranged outside the support 4, the outermost end of the support 4 in the first direction is provided with a ring-shaped protrusion 46. The arrangement of the ring-shaped protrusion 46 can increase the creepage distance between the end of the winding (i.e., the primary winding 2 and the secondary winding) away from the base 5 and the portion of the magnetic core 1 arranged outside the support 4, thereby reducing the possibility of short circuit between the end of the winding away from the base 5 and the portion of the magnetic core 1 arranged outside the support 4.

[0180] In this example, the annular protrusion 46 protrudes away from the surface of the base 5 and the original side winding 2, which can make the annular protrusion 46 separate the end of the original side winding 2 away from the base 5 and the part of the magnetic core located outside the bracket 4, so as to reduce or avoid the possibility of short circuit between the end of the original side winding 2 away from the base 5 and the part of the magnetic core 1 located outside the bracket 4.

[0181] The first flange 461 can increase the creepage distance between the end of the original side winding 2 close to the base 5 and the part of the magnetic core 1 located outside the bracket 4, so as to reduce or avoid the possibility of short circuit between the end of the original side winding 2 close to the base 5 and the part of the magnetic core 1 located outside the bracket 4.

[0182] The second flange 462 and the third flange 463 can increase the creepage distance between the two ends of the original side winding 2 in the axial direction of the first channel 71 and the part of the magnetic core 1 located outside the bracket 4, so as to reduce or avoid the possibility of short circuit between the two ends of the original side winding 2 in the axial direction of the first channel 71 and the part of the magnetic core 1 located outside the bracket 4.

[0183] Wherein, since the first secondary side winding 31, the second secondary side winding 32 and the third secondary side winding 33 are located between the original side winding 2 and the bracket 4, the annular protrusion 46 increases the creepage distance between the original side winding 2 and the part of the magnetic core 1 located outside the bracket 4, and for the same reason, also increases the creepage distance between the first secondary side winding 31 and the part of the magnetic core 1 located outside the bracket 4 and the creepage distance between the second secondary side winding 32 and the part of the magnetic core 1 located outside the bracket 4, that is, reduces or avoids the possibility of short circuit between the end of the first secondary side winding 31 away from the base 5 and the part of the magnetic core 1 located outside the bracket 4 and the possibility of short circuit between the end of the second secondary side winding 32 away from the base 5 and the part of the magnetic core 1 located outside the bracket 4, so as to improve the safety and reliability of the magnetic integrated structure 01.

[0184] In some examples, the bracket 4 is provided with an annular protrusion 46 at each end in the first direction, so as to increase the creepage distance between the winding located at each end in the first direction and the part of the magnetic core 1 located outside the bracket 4, and improve the safety and reliability of the magnetic integrated structure 01.

[0185] For example, referring to Figure 6 and Figure 8 , Figure 8 The annular protrusion 46 on the left side of the figure can increase the creepage distance between the first positive electric original side winding 21 and the part of the magnetic core 1 located outside the bracket 4, so as to reduce the possibility of short circuit between the first positive electric original side winding 2 and the part of the magnetic core 1 located outside the bracket 4. Moreover, the annular protrusion 46 on the left side of the figure can also increase the creepage distance between the second secondary side winding 32 and the part of the magnetic core 1 located outside the bracket 4, and reduce the possibility of short circuit between the second secondary side winding 32 winding and the part of the magnetic core 1 located outside the bracket 4.

[0186] Figure 8 The annular protrusion 46 on the right side of the figure can increase the creepage distance between the negative primary winding 23 and the part of the first magnetic core 11 located outside the bracket 4, thereby reducing the possibility of short circuit between the negative primary winding 23 and the part of the first magnetic core 11 located outside the bracket 4. Moreover, the annular protrusion 46 on the right side of the figure can also increase the creepage distance between the third secondary winding 33 and the part of the first magnetic core 1 located outside the bracket 4, thereby reducing the possibility of short circuit between the second secondary winding 32 and the part of the magnetic core 1 located outside the bracket 4.

[0187] Since the first secondary winding 31 is located between the second secondary winding 32 and the third secondary winding 33, if the creepage distance between the second secondary winding 32 and the magnetic core 1, and the creepage distance between the third secondary winding 33 and the magnetic core 1 meet the requirements of safety specifications and standards, then the creepage distance between the first secondary winding 31 and the magnetic core 1 also meets the requirements of safety specifications and standards.

[0188] Since the second positive primary winding 22 is located between the first positive primary winding 21 and the negative primary winding 23, if the creepage distance between the first positive primary winding 21 and the magnetic core 1, and the creepage distance between the negative primary winding 23 and the magnetic core 1 meet the requirements of safety specifications and standards, then the creepage distance between the second positive primary winding 22 and the magnetic core 1 also meets the requirements of safety specifications and standards.

[0189] In some examples, referring to Figure 8 , the annular protrusion 46 is provided with a protruding block 47 away from the surface of the primary winding 2, and the surface of the protruding block 47 towards the magnetic core 1 abuts against the side wall of the magnetic core 1.

[0190] Referring to Figure 3 and Figure 8 , the surface of the protruding block 47 towards the second magnetic core 12 abuts against the side wall of the second magnetic core 12. The protruding block 47 can play a role of installation and positioning for the second magnetic core 12. For example, the position of the second magnetic core 12 can be limited by the protruding block 47, thereby facilitating the fixation of the second magnetic core 12. In order to better fix the second magnetic core 12, the protruding block 47 and the second magnetic core 12 can be bonded by fixing glue after the protruding block 47 abuts against the second magnetic core 12.

[0191] In addition, the protruding block 47 can also play a guiding role for the second magnetic core 12. For example, the first magnetic core 11 is arranged in the first channel 71, and when the second magnetic core 12 is inserted between the first flange 461, the second flange 462 and the third flange 463 in a direction perpendicular to the first magnetic core 11, the surface of the protruding block 47 towards the second magnetic core 12 can play a role of installation and guiding for the second magnetic core 12, thereby facilitating the connection of the second magnetic core 12 and the first magnetic core 11.

[0192] In some examples, the protrusion 47 can include one, for example, the second magnetic core 12 is located between the protrusion 47 and the second flange 462, and the second magnetic core 12 is in abutment with the protrusion 47 and the second flange 462, respectively.

[0193] The protrusion 47 can also include multiple. For example, referring to Figure 3 and Figure 8 The protrusion 47 includes two, and the second magnetic core 12 is in abutment with the two protrusions 47, respectively.

[0194] In other examples, any one of the first flange 461, the second flange 462 and the third flange 463 can also be provided with a protrusion 47, and the setting manner and advantages of the protrusion 47 have been described above, which will not be repeated here.

[0195] Figure 9 An exploded view of the support 4 of the above-mentioned magnetic integrated structure is shown, and the first secondary side winding 31, the second secondary side winding 32 and the third secondary side winding 33 are removed to avoid interference. Referring to Figure 8 and Figure 9 The first part 41 and the second part 42 are connected by a clamping structure 43. The clamping structure 43 includes a first protrusion 431 and a first recess 432. The outer peripheral surface of the first part 41 is provided with the first protrusion 431, and the inner wall surface of the second part 42 is provided with the first recess 432.

[0196] In assembly, the first part 41 is inserted into the second part 42, and the first protrusion 431 is connected with the first recess 432, that is, the first protrusion 431 is accommodated in the first recess 432, to realize the clamping of the first part 41 and the second part 42. This connection method is simple and convenient to operate.

[0197] In some examples, the outer peripheral surface of the first part 41 can be provided with a plurality of first protrusions 431, and the first protrusion 431 includes multiple, and the plurality of first protrusions 431 are arranged at intervals around the outer peripheral surface of the first part 41. The number of first recesses 432 is the same as and one-to-one corresponds to the number of first protrusions 431. In this way, the connection of each first protrusion 431 and the corresponding first recess 432 increases the number of connection points of the first part 41 and the second part 42, thereby improving the connection reliability of the first part 41 and the second part 42.

[0198] In some examples, the plurality of first protrusions 431 are uniformly arranged at intervals around the outer peripheral surface of the first part 41, which can uniformly arrange the connection points of the first part 41 and the second part 42 in the circumferential direction, so that the first part 41 and the second part 42 are uniformly stressed, further improving the connection reliability of the first part 41 and the second part 42.

[0199] In some examples, referring to Figure 9The outer circumferential surface of the first part 41 is provided with a third protrusion 48, which abuts against the second part 42.

[0200] By means of the third protrusion 48, the insertion depth of the first part 41 can be limited, preventing damage to the second part 42 caused by excessive insertion of the first part 41. In addition, the position of the third protrusion 48 can be set as a basis for determining whether the first part 41 and the second part 42 are connected in place. For example, the position of the third protrusion 48 is determined according to the insertion depth of the first part 41, and if the third protrusion 48 contacts the second part 42, the first part 41 and the second part 42 are connected in place. If there is no contact, the first part 41 and the second part 42 are not connected in place.

[0201] During assembly, the user only needs to insert the first part 41 into the second part 42, without worrying about the problem of insufficient or excessive insertion depth. This not only improves work efficiency, but also reduces the difficulty of operation.

[0202] In other examples, the outer circumferential surface of the second part 42 can be provided with a first protrusion 431, and the inner wall surface of the first part 41 can be provided with a first recess 432. During assembly, the end of the second part 42 is inserted into the first part 41, and the first protrusion 431 is connected with the first recess 432, i.e. the first protrusion 431 is accommodated in the first recess 432, to realize the connection of the first part 41 and the second part 42.

[0203] In some examples, referring to Figure 9 The inner diameter of the area of the second part 42 for connecting with the first part 41 is smaller than the inner diameter of other areas of the second part 42. In this way, an annular stepped surface is formed between the two areas, which is opposite to the end surface of the first part 41. The annular stepped surface can limit the insertion depth of the first part 41, preventing damage to the second part 42 caused by excessive insertion of the first part 41.

[0204] In other embodiments of the present application, the first protrusion 431 and the first recess 432 can also be provided at other positions of the bracket 4, for example, the first protrusion 431 is provided at the end surface of the first part 41, and the first recess 432 is provided at the end surface of the second part 42. The present application does not make specific limitations.

[0205] In addition, the first part 41 and the second part 42 can also be connected together by other means, and the present application does not make limitations in this regard, and those skilled in the art can selectively design according to actual needs.

[0206] In some examples, referring to Figure 9 The outer circumferential surface of the bracket 4 has a first ring groove 451, a second ring groove 452, and a third ring groove 453.

[0207] Referring to Figure 8 and Figure 9 The first secondary winding 31 is accommodated in the first ring slot 451. The second secondary winding 32 is accommodated in the second ring slot 452. The third secondary winding 33 is accommodated in the third ring slot 453.

[0208] In order to prevent the first secondary winding 31, the second secondary winding 32 and the third secondary winding 33 from being too close to each other to cause short circuit. The first ring slot 451 limits the axial sliding of the first secondary winding 31 on the support 4. The second ring slot 452 limits the axial sliding of the second secondary winding 32 on the support 4. The third ring slot 453 limits the axial sliding of the third secondary winding 33 on the support 4.

[0209] That is, the first secondary winding 31 is accommodated in the first ring slot 451, and the first secondary winding 31 slides on the support 4 in the first direction to abut against one side wall of the first ring slot 451, and the side wall can resist the first secondary winding 31 to block the sliding of the first secondary winding 31 in the first direction. In some examples, the two side walls of the first ring slot 451 in the first direction can be made to abut against the two ends of the first secondary winding 31 in the first direction, so as to limit the first secondary winding 31 in the first ring slot 451, and further reduce the possibility of the first secondary winding 31 moving in the first direction.

[0210] The limiting manner of the second ring slot 452 to the second secondary winding 32 and the limiting manner of the third ring slot 453 to the third secondary winding 33 are the same as the limiting manner of the first ring slot 451 to the first secondary winding 31, which will not be described herein again.

[0211] In addition, the positions of the first ring slot 451 and the third ring slot 453 on the first part 41 can be selected according to actual needs, for example, the first ring slot 451 is closer to the second ring slot 452 than the third ring slot 453, or the third ring slot 453 is closer to the second ring slot 452 than the first ring slot 451. The embodiments of the present application are not specifically limited.

[0212] Figure 10 A partial structure schematic view of another angle of the above magnetic integration structure is shown. In some examples, referring to Figure 10 The first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 are inserted into the base 5. When assembling, the first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 are assembled on the base 5.

[0213] In some examples, the first positive primary side winding 21, the second positive primary side winding 22, the negative primary side winding 23 and the base 5 constitute an integrally formed structure. In other words, the first positive primary side winding 21, the second positive primary side winding 22, the negative primary side winding 23 and the base 5 are integrally formed by embedding or the like, so as to form the integrally formed structure. In this way, during processing, the assembly process of the first positive primary side winding 21, the second positive primary side winding 22 and the negative primary side winding 23 can be saved, and the assembly efficiency can be improved.

[0214] With reference to Figure 10 , the outer circumferential surface of the bracket 4 is provided with a second protrusion 44, and the surface of the base 5 facing the second protrusion 44 is provided with a second groove 51. Through the connection of the second protrusion 44 and the second groove 51, the connection of the bracket 4 and the base 5 is realized.

[0215] For example, in some examples, the second protrusion 44 is accommodated in the second groove 51, and the surface of the second protrusion 44 facing away from the base 5 is connected, such as bonded, with one groove wall of the second groove 51, and the surface of the second protrusion 44 facing the base 5 is connected, such as bonded, with the other groove wall of the second groove 51.

[0216] In other examples, the second protrusion 44 is provided on the base 5, and the second groove 51 is provided on the bracket 4. The surface of the second protrusion 44 facing the bracket 4 is connected, such as abutted, with one groove wall of the second groove 51, and the surface of the second protrusion 44 facing away from the bracket 4 is connected, such as abutted, with the other groove wall of the second groove 51.

[0217] In some examples, the number of the second protrusions 44 and the second grooves 51 used to connect the bracket 4 and the base 5 can be multiple, for example, with reference to Figure 10 , the second groove 51 includes two, the two second grooves 51 are oppositely arranged, and the bracket 4 is provided with the second protrusion 44 facing the surface of each second groove 51. In addition, the number of the second protrusions 44 and the number of the second grooves 51 can be the same, for example, one second protrusion 44 corresponds to each second groove 51. The number of the second protrusions 44 and the number of the second grooves 51 can also be different, for example, one second groove 51 corresponds to multiple second protrusions 44. In this regard, the present application does not make specific limitations.

[0218] Figure 11 The bracket 4 and the base 5 of the above-mentioned magnetic integrated structure are shown in a structure schematic diagram in a state to be connected, and the first secondary side winding, the second secondary side winding and the third secondary side winding are removed to avoid interference. With reference to Figure 10 and Figure 11The second recess 51 comprises a bottom wall 512 and two opposite side walls 511. The second protrusion 44 abuts against the two side walls 511 respectively. The second recess 51 is provided with an opening 513 at the outermost end in the first direction. The opening 513 allows the second protrusion 44 to be inserted into the second recess 51.

[0219] The two side walls 511 can limit the second protrusion 44 in the second recess 51. That is, the second protrusion 44 is accommodated in the second recess 51 and abuts against the two side walls 511 respectively. Since the two side walls 511 are opposite to each other, the second protrusion 44 is prevented from moving towards any one of the side walls. The bottom wall 512 can prevent the second protrusion 44 from moving in the direction close to the bottom wall 512. The opening of the second recess 51 allows the fourth protrusion 492 to be inserted into the second recess 51.

[0220] In some examples, referring to Figure 11 In the direction of the first portion 41 towards the second portion 42, the size of the second protrusion 44 in the third direction, i.e. from the bracket 4 to the base 5, gradually increases. It can be understood that the size of the second protrusion 44 away from the first portion 41 in the third direction is greater than the size of the second protrusion 44 close to the first portion 41 in the third direction. Since the size of the second protrusion 44 close to the first portion 41 in the third direction is smaller, it is convenient for the second protrusion 44 to be inserted into the second recess 51, and the second protrusion 44 can further extend into the second recess 51. The size of the second protrusion 44 close to the first portion 41 in the third direction is greater, so that as the second protrusion 44 gradually penetrates into the second recess 51, the force between the second protrusion 44 and the side wall 511 of the second recess 51 gradually increases, which can be used to limit the sliding of the second protrusion 44 in the second recess 51.

[0221] Referring to Figure 11 The bracket 4 away from the base 5 is provided with a first connecting column 61, a second connecting column 62 and a third connecting column 63.

[0222] Referring to Figure 3 and Figure 11 The first connecting column 61 is connected with the end of the first auxiliary side winding 31. The second connecting column 62 is connected with the end of the second auxiliary side winding 32. The third connecting column 63 is connected with the end of the third auxiliary side winding 33. Among them, the end of the first auxiliary side winding 31 comprises two, so the first connecting column 61 also comprises two, and each end of the first auxiliary side winding 31 is connected with one first connecting column 61. Similarly, the end of the second auxiliary side winding 32 comprises two, so the second connecting column 62 also comprises two, and each end of the second auxiliary side winding 32 is connected with one second connecting column 62. The end of the third auxiliary side winding 33 comprises two, so the third connecting column 63 also comprises two, and each end of the third auxiliary side winding 33 is connected with one third connecting column 63.

[0223] Since the first secondary winding 31 is used for detecting the arc fault characteristic signal, the second secondary winding 32 is used for transmitting the PLC communication signal. In order to avoid interference between the two, in some examples, with reference to Figure 11 , the first connecting post 61 and the second connecting post 62 are respectively located at opposite ends of the bracket 4 in the first direction. In this way, the end of the first secondary winding 31 and the end of the second secondary winding 32 can have a larger spacing, which can reduce the degree of interference between the circuit in which the first secondary winding 31 is energized (i.e., the circuit for detecting the arc fault characteristic signal) and the circuit in which the second secondary winding 32 is energized (i.e., the circuit for transmitting the PLC communication signal), to ensure that the circuit for detecting the arc fault characteristic signal and the circuit for transmitting the PLC communication signal can both operate normally, improving the operation reliability.

[0224] Since the first secondary winding 31 and the third secondary winding 33 are both used for detecting the arc fault characteristic signal, the first connecting post 61 and the third connecting post 63 can be located on the same side of the bracket 4 in the first direction. That is, the end of the second secondary winding 32 and the end of the third secondary winding 33 also have a spacing, so the operation reliability of the circuit for detecting the arc fault characteristic signal and the circuit for transmitting the PLC communication signal can also be improved.

[0225] The arrangement order of the first connecting post 61 and the third connecting post 63 located on the same side can be selectively designed according to actual needs, and the embodiments of the present application do not make specific limitations thereto.

[0226] In some examples, with reference to Figure 11 , the size of the end of the bracket 4 away from the base 5 in the first direction is smaller than the size of the end of the bracket 4 close to the base 5 in the first direction. Compared with the case where the size of the end of the bracket 4 away from the base 5 in the first direction is the same as the size of the end of the bracket 4 close to the base 5 in the first direction, the size of the end of the bracket 4 close to the base 5 in the first direction is increased.

[0227] With reference to Figure 3 and Figure 11Since the second secondary winding 32, the first secondary winding 31 and the third secondary winding 33 are sequentially arranged on the outer circumferential surface of the bracket 4 in the first direction, and the second secondary winding 32, the first secondary winding 31 and the third secondary winding 33 have a gap between each other. By increasing the size of the bracket 4 in the first direction, the gap between the first secondary winding 31 and the second secondary winding 32 can be increased, so that the distance between the first secondary winding 31 and the second secondary winding 32 meets the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.). Similarly, the gap between the first secondary winding 31 and the third secondary winding 33 can also be increased, so that the distance between the first secondary winding 31 and the third secondary winding 33 meets the safety specifications and standard requirements.

[0228] In addition, in some examples, with reference to Figure 11 Since the first connecting column 61 and the third connecting column 63 are located on the side of the bracket 4 close to the base 5, and the first connecting column 61 and the third connecting column 63 are located at opposite ends of the bracket 4 in the first direction. By increasing the size of the end of the bracket 4 close to the base 5 in the first direction, the distance between the first connecting column 61 and the third connecting column 63 and the adjacent winding can be increased, so that the distance between the first connecting column 61 and the third connecting column 63 and the adjacent winding meets the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.).

[0229] Similarly, the second connecting column 62 is located on the side of the bracket 4 close to the base 5, and the second connecting column 62 is located on one side of the bracket 4 in the first direction. By increasing the size of the end of the bracket 4 close to the base 5 in the first direction, the distance between the second connecting column 62 and the adjacent winding can be increased, so that the distance between the second connecting column 62 and the adjacent winding meets the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.).

[0230] In some examples, the size of the base 5 in the first direction can be the same as the size of the end of the bracket 4 close to the base 5 in the first direction, that is, the size of the base 5 in the first direction is increased, so that the first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 can have sufficient distance between each other to meet the safety specifications and standard requirements (such as electrical clearance, creepage distance, etc.).

[0231] Figure 12 The structural schematic diagram of the base 5 of the above magnetic integrated structure is shown. With reference to Figure 11 and Figure 12 The surface of the base 5 facing the bracket 4 is provided with a plurality of third grooves 52. A part of each primary winding 2 is accommodated in the third groove 52.

[0232] A part of the primary winding 2 is accommodated in the third groove 52, and when the primary winding 2 slides on the base 5 in the first direction to abut against one side wall of the third groove 52, the side wall can abut against the primary winding 2 to block the sliding of the primary winding 2 in the first direction. In some examples, the two side walls of the third groove 52 can be caused to abut against the opposite two ends of the primary winding 2 in the first direction respectively, so as to limit the primary winding 2 in the first ring groove 451, and further reduce the possibility of the primary winding 2 moving in the first direction.

[0233] Therefore, the primary winding 2 is limited by the third groove 52 to prevent the primary winding 2 from sliding on the base 5, so as to avoid the situation that the distance between the primary windings 2 or between the primary winding 2 and the secondary winding is reduced to cause short circuit.

[0234] The number, shape and position of the third groove 52 of the base 5 can be selectively designed according to the number, shape and position of the primary winding 2. For example, referring to Figure 3 and Figure 12 , the primary module includes a first positive primary winding 21, a second positive primary winding 22 and a negative primary winding 23, and the first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 are sequentially and spaced apart in the first direction on the base 5. Correspondingly, the third groove 52 can include three, and the three third grooves 52 are spaced apart on the support. Among them, the first positive primary winding 21, the second positive primary winding 22 and the negative primary winding 23 are respectively accommodated in the respective third grooves 52.

[0235] Referring to Figure 3 and Figure 12 , the bottom surface of the third groove 52 is provided with a first hole 53 for the end portion of the primary winding 2 to pass through. The first hole 53 can facilitate the end portion of the primary winding 2 to pass through the base 5 to extend to the side of the base 5 away from the support 4, so as to facilitate the connection of the primary winding 2 with external elements. In addition, if the connection is made on multiple sides of the base 5, it may affect the operation of the primary winding 2, the secondary winding and the magnetic core. Therefore, the end portion of the primary winding 2 is located on the same side of the base 5, so as to facilitate the connection on the same side, and avoid the electromagnetic interference between the wire harness connected with the primary winding and the secondary winding or the magnetic core.

[0236] Among them, the number, position and shape of the first hole 53 can be selectively designed according to the number, shape and position of the end portion of the primary winding 2, for example, the end portion is circular, and correspondingly, the first hole 53 is circular, which is not limited in the embodiments of the application.

[0237] 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 change or replacement within the technical scope disclosed by the present application 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. A magnetic integrated structure, characterized in that, The application relates to a transformer, which comprises: a magnetic core; a support, which has a first channel penetrating through the support along a first direction, a part of the magnetic core penetrating through the first channel, the first direction being the axial direction of the first channel; a base, which is arranged on one side of the support along the radial direction of the first channel; a primary winding, which is inserted into the base and through which the support penetrates; a first secondary winding and a second secondary winding, which are arranged on the outer circumferential surface of the support along the axial direction of the first channel, and the first secondary winding and the second secondary winding are arranged in sequence, and the first secondary winding and the second secondary winding are located between the primary winding and the support along the radial direction of the first channel.

2. The magnetic integrated structure of claim 1, wherein, The support comprises a first part and a second part arranged in the first direction, the first part and the second part are connected through a clamping structure, and the inner wall of the first part and the inner wall of the second part enclose the first channel; the first secondary winding is arranged on the first part; the second secondary winding is arranged on the second part.

3. The magnetic integrated structure of claim 2, wherein, The clamping structure comprises a first protrusion and a first groove; one of the first part and the second part is provided with the first protrusion; the other of the first part and the second part is provided with the first groove.

4. The magnetic integrated structure of any one of claims 1-3, wherein, The outer circumferential surface of the support is provided with a first ring groove and a second ring groove, and the first ring groove and the second ring groove are arranged in the first direction; the first secondary winding is arranged in the first ring groove; the second secondary winding is arranged in the second ring groove.

5. The magnetic integrated structure of any one of claims 1-4, wherein, The end of the support in the first direction is provided with a ring-shaped protrusion, which protrudes from the surface of the base and is away from the primary winding; along the radial direction of the first channel, the edge of the ring-shaped protrusion extends in the direction away from the primary winding to form a first flange, a second flange and a third flange; the first flange is located on the side of the ring-shaped protrusion close to the base, and the first flange is connected between the second flange and the third flange.

6. The magnetic integrated structure of any one of claims 1-5, wherein, The side of the support close to the base is provided with a first connecting column and a second connecting column, and the first connecting column and the second connecting column are respectively located on the opposite ends of the support in the first direction; the first connecting column is connected with the end of the first secondary winding; the second connecting column is connected with the end of the second secondary winding.

7. The magnetic integrated structure of any one of claims 1-6, wherein, The size of the end of the support away from the base in the first direction is smaller than the size of the end of the support close to the base in the first direction.

8. The magnetic integrated structure of any one of claims 1-7, wherein, One of the support and the base is provided with a second protrusion, and the other is provided with a second groove, the second protrusion is arranged in the second groove, and the second protrusion is connected with the second groove.

9. The magnetic integrated structure of any one of claims 1-8, wherein, The surface of the base close to the support is provided with a third groove, and a part of the primary winding is arranged in the third groove.

10. The magnetic integrated structure of any one of claims 1-9, wherein, The magnetic core comprises a first magnetic core and a second magnetic core, and a part of at least one of the first magnetic core and the second magnetic core penetrates through the first channel. The first magnetic core is arranged opposite to the second magnetic core in a direction from the base to the support, and an air gap is arranged between the first magnetic core and the second magnetic core.

11. The magnetic integrated structure of any one of claims 1-10, wherein, The first secondary winding and the second secondary winding each have a gap with the primary winding; The primary winding comprises a first positive-electricity primary winding, a second positive-electricity primary winding and a negative-electricity primary winding, and the first positive-electricity primary winding, the second positive-electricity primary winding and the negative-electricity primary winding are sequentially and spacedly arranged on the base in the first channel axis direction.

12. The magnetic integrated structure of claim 11, wherein, The first positive-electricity primary winding, the second positive-electricity primary winding and the negative-electricity primary winding have the same number of turns. The sum of the number of turns of the first positive-electricity primary winding and the number of turns of the second positive-electricity primary winding is equal to the number of turns of the second secondary winding.

13. The magnetic integrated structure of claim 11, wherein, The first positive-electricity primary winding, the second positive-electricity primary winding and the negative-electricity primary winding have different numbers of turns. The sum of the number of turns of the first positive-electricity primary winding, the number of turns of the second positive-electricity primary winding and the number of turns of the negative-electricity primary winding is equal to the number of turns of the second secondary winding.

14. A power conversion device, characterized by The magnetic integrated structure comprises a shell and the magnetic integrated structure according to any one of claims 1-13, the magnetic integrated structure is located in the shell, the first secondary winding is used to output a first induced current, and the second secondary winding is used to output a second induced current with a power line carrier communication signal.

15. The power conversion device of claim 14, wherein, The primary winding comprises a first positive-electricity primary winding, a second positive-electricity primary winding and a negative-electricity primary winding, and the differential mode current directions of the first positive-electricity primary winding, the second positive-electricity primary winding and the negative-electricity primary winding are the same.

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