Integrated inductor and power converter

Abstract

The application provides an integrated inductor and power converter, and relates to the technical field of photovoltaics. The integrated inductor comprises a magnetic core and two windings. The magnetic core comprises a first magnetic yoke and a second magnetic yoke, a first magnetic column and a second magnetic column, a first side column connected to both ends of the first magnetic column, and a second side column connected to both ends of the second magnetic column. The two windings are arranged on the outer periphery of the two magnetic columns. The first magnetic column and the second magnetic column are connected to the first magnetic yoke and the second magnetic yoke. The magnetic circuit reluctance through the first magnetic column, the first magnetic yoke, the second magnetic column and the second magnetic yoke is smaller than the magnetic circuit reluctance through the first magnetic column and the first side column and smaller than the magnetic circuit reluctance through the second magnetic column and the second side column. The magnetic circuit reluctance through the first magnetic column and the first side column is smaller than the magnetic circuit reluctance through the first magnetic column, the first magnetic yoke, the second side column and the second magnetic yoke. The magnetic circuit reluctance through the second magnetic column and the second side column is smaller than the magnetic circuit reluctance through the second magnetic column, the first magnetic yoke, the first side column and the second magnetic yoke. The application can improve the problem of high coupling of differential mode and common mode magnetic flux.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to an integrated inductor and power converter. Background Technology

[0002] For a three-phase inverter using an interleaved parallel topology, each phase arm typically contains two independent inductors, requiring a total of six discrete magnetic components in a three-phase system. To reduce the size of magnetic components, increase power density, and lower system costs, integrating multiple discrete inductors into a single integrated magnetic component using magnetic integration technology has become an important technical approach.

[0003] Currently, common inductor integration methods integrate two independent inductors in a single-phase bridge arm, forming a three-column structure. The two windings are wound on the two side columns, and the middle column serves as a decoupling column. However, in this structure, one of the differential-mode flux and the other of the common-mode flux form a small loop through the side columns, upper and lower yokes, and the decoupling column, while the other forms a large outer loop through the upper and lower yokes and the two side columns. The two types of magnetic circuits are highly coupled, causing the differential-mode inductance and common-mode inductance to mutually constrain each other during design. This makes it impossible to achieve decoupling design and independent optimization, and it is difficult to meet the system's differentiated requirements for differential-mode filtering and common-mode suppression. Summary of the Invention

[0004] This application provides an integrated inductor and power converter that can improve the problem of high coupling between differential-mode and common-mode flux paths, and facilitates independent optimization design of differential-mode and common-mode inductance.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: On the one hand, this application provides an integrated inductor, which includes a magnetic core, a first winding, and a second winding. The magnetic core includes a first magnetic yoke, a second magnetic yoke, a first magnetic pillar, a second magnetic pillar, a first side pillar, and a second side pillar. The first and second magnetic yokes are spaced apart along a first direction, and the first and second magnetic pillars are spaced apart along a second direction. One end of each of the first and second magnetic pillars is connected to the first magnetic yoke, and the other end is connected to the second magnetic yoke. The first direction is perpendicular to the second direction. The two ends of the first side pillar are respectively connected to the two ends of the first magnetic pillar, and the two ends of the second side pillar are respectively connected to the two ends of the second magnetic pillar. The magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar and the first side pillar, and less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar and the second side pillar. The magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar and the first side pillar is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second side pillar, and the second magnetic yoke. The magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar and the second side pillar is less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar, the first magnetic yoke, the first side pillar, and the second magnetic yoke. The first winding is wound around the outer periphery of the first magnetic post, and the second winding is wound around the outer periphery of the second magnetic post.

[0006] In the integrated inductor provided in this application, the first and second magnetic pillars used for winding the integrated inductor are arranged close together (i.e., there is no decoupling pillar between the first and second magnetic pillars), with the first side pillar located outside the first magnetic pillar and the second side pillar located outside the second magnetic pillar; that is, neither the first nor the second side pillar is located between the first and second magnetic pillars. Through this structural layout, combined with the aforementioned reluctance relationship of the toroidal magnetic circuit formed by the different parts, when the first and second windings of the integrated inductor are coupled in the same direction at their corresponding terminals, if current is applied to the integrated inductor, the current flowing through the two windings (i.e., the first and second windings) generates a magnetic field around each winding according to the right-hand screw rule. If a differential-mode current is applied to the integrated inductor, since the direction of the magnetic flux through the first magnetic post is the same as that through the second magnetic post (both upwards or both downwards) according to the right-hand screw rule, and the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post and the first side post is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post, the first yoke, the second side post, and the second yoke, the differential-mode magnetic flux through the first magnetic post can form a closed annular magnetic circuit through the first side post. Since the magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar and the second side pillar is less than that of the annular magnetic circuit formed by the second magnetic pillar, the first magnetic yoke, the first side pillar, and the second magnetic yoke, the differential-mode magnetic flux passing through the second magnetic pillar can form a closed annular magnetic circuit through the second side pillar. If a common-mode current is passed into the integrated inductor, since the direction of the magnetic flux passing through the first magnetic pillar is opposite to that passing through the second magnetic pillar (one is upward and the other is downward) according to the right-hand screw rule, and the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke is less than that of the annular magnetic circuit formed by the first magnetic pillar and the first side pillar, and also less than that of the annular magnetic circuit formed by the second magnetic pillar and the second side pillar, the common-mode magnetic flux generated at the first magnetic pillar and the second magnetic pillar both form a closed annular magnetic circuit through the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke.

[0007] When the first and second windings of an integrated inductor are coupled in reverse at their corresponding terminals, if a differential-mode current is applied to the integrated inductor, according to the right-hand screw rule, the magnetic flux directions through the first magnetic post and the second magnetic post are opposite (one upwards and the other downwards). Furthermore, the reluctance of the annular magnetic circuit formed by the first magnetic post, the first yoke, the second magnetic post, and the second yoke is less than both the reluctance of the annular magnetic circuit formed by the first magnetic post and the first side post, and also less than the reluctance of the annular magnetic circuit formed by the second magnetic post and the second side post. Therefore, the first and second magnetic posts produce... The generated differential-mode magnetic flux forms a closed loop magnetic circuit through the first magnetic pillar, the first yoke, the second magnetic pillar, and the second yoke. If a common-mode current is applied to this integrated inductor, according to the right-hand rule, the direction of the magnetic flux through the first magnetic pillar is the same as the direction of the magnetic flux through the second magnetic pillar (both upwards or both downwards). Furthermore, the magnetic reluctance of the loop magnetic circuit formed by the first magnetic pillar and the first side pillar is less than the magnetic reluctance of the loop magnetic circuit formed by the first magnetic pillar, the first yoke, the second side pillar, and the second yoke. Therefore, the common-mode magnetic flux generated through the first magnetic pillar can form a closed loop magnetic circuit through the first side pillar. Similarly, since the magnetic reluctance of the loop magnetic circuit formed by the second magnetic pillar and the second side pillar is less than the magnetic reluctance of the loop magnetic circuit formed by the second magnetic pillar, the first yoke, the first side pillar, and the second yoke, the common-mode magnetic flux generated through the second magnetic pillar can form a closed loop magnetic circuit through the second side pillar.

[0008] As can be seen from the above analysis, regardless of whether same-name terminals are coupled in the same direction or in opposite directions, when using the integrated inductor provided in this application, one of the common-mode and differential-mode magnetic flux paths forms a closed loop magnetic circuit through the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke, while the other forms a closed loop magnetic circuit through the corresponding magnetic pillar and the corresponding side pillar (i.e., the first magnetic pillar and the first side pillar form a closed loop magnetic circuit, and the second magnetic pillar and the second side pillar form a closed loop magnetic circuit). The differential-mode and common-mode magnetic flux paths can be essentially decoupled. Using the integrated inductor provided in this application can improve the problem of high coupling between differential-mode and common-mode magnetic flux paths in some solutions, which is beneficial for the independent optimization of differential-mode and common-mode inductance and improves the design flexibility of differential-mode and common-mode inductance.

[0009] In one implementation, both the first and second magnetic yokes are made of high permeability materials, while both the first and second side pillars are made of low permeability materials.

[0010] By using high permeability materials for the first and second magnetic yokes, it is beneficial to reduce the magnetic resistance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke.

[0011] In one implementation, the magnetic circuit length of the annular magnetic circuit formed by the first magnetic post, the first magnetic yoke, the second magnetic post, and the second magnetic yoke is less than the magnetic reluctance length of the annular magnetic circuit formed by the first magnetic post and the first side post, and is also less than the magnetic circuit length of the annular magnetic circuit formed by the second magnetic post and the second side post.

[0012] Shortening the magnetic circuit length of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke can help reduce the magnetic resistance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke.

[0013] In one implementation, the magnetic circuit length of the annular magnetic circuit formed by the first magnetic post and the first side post is less than the magnetic circuit length of the annular magnetic circuit formed by the first magnetic post, the first magnetic yoke, the second side post, and the second magnetic yoke; the magnetic circuit length of the annular magnetic circuit formed by the second magnetic post and the second side post is less than the magnetic circuit length of the annular magnetic circuit formed by the second magnetic post, the first magnetic yoke, the first side post, and the second magnetic yoke.

[0014] By changing the length of the magnetic circuit as described above, this application enables the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post and the first side post to be less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post, the first magnetic yoke, the second side post, and the second magnetic yoke, and the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post and the second side post to be less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post, the first magnetic yoke, the first side post, and the second magnetic yoke.

[0015] In one implementation, the magnetic materials of the first magnetic yoke, the second magnetic yoke, the first magnetic post, and the second magnetic post are respectively made of either iron-silicon-aluminum or iron-nickel-molybdenum.

[0016] Because iron-silicon-aluminum (FeNiA) offers the most balanced overall performance, its distributed air-gap structure naturally endows it with excellent DC bias resistance and can withstand common-mode low-frequency high current. Simultaneously, its high-frequency loss is significantly lower than that of iron powder cores, meeting the low magnetic loss requirements of differential-mode high-frequency high-ripple, and it exhibits low magnetostriction and low noise, making it the most universally suitable choice for common magnetic circuits. Among metal powder cores, iron-nickel-molybdenum (FeNiMo) has the lowest high-frequency loss, and its temperature rise control under differential-mode conditions is superior to that of iron-silicon-aluminum. Furthermore, FeNiMo possesses good anti-saturation capabilities. When the system has stringent requirements for differential-mode loss and the common-mode bias magnetic field strength is moderate, FeNiMo can achieve superior efficiency. Therefore, when the first yoke, second yoke, first magnetic pillar, and second magnetic pillar serve as a common magnetic circuit, or partially as a common magnetic circuit, selecting the above materials can balance the requirements of high-frequency high-ripple differential-mode flux and low-frequency high-current common-mode flux, achieving a balance between high-frequency low loss and strong anti-saturation bias capability.

[0017] In one implementation, when the first and second side pillars are connected by differential-mode magnetic flux, the magnetic materials of the first and second side pillars are any one of ferrite, iron-nickel-molybdenum, and iron-silicon-aluminum, respectively; when the first and second side pillars are connected by common-mode magnetic flux, the magnetic materials of the first and second side pillars are any one of iron-nickel alloy, iron-silicon-aluminum, and iron-based amorphous materials, respectively.

[0018] Ferrites (such as manganese-zinc ferrite) have the lowest high-frequency loss among all soft magnetic materials and are cost-effective, making them the first choice for achieving high efficiency in differential-mode magnetic circuits. Iron-nickel-molybdenum (FeNiMo) powder cores have the lowest high-frequency loss among metal powder cores, exhibit superior temperature rise control under differential-mode conditions, and possess distributed air gaps, eliminating edge flux problems. Their permeability changes minimally with frequency and temperature, making them suitable for applications requiring high loss and stability while avoiding the concentrated edge effects of ferrite air gaps. Iron-silicon-aluminum (FeSiA) cores have high-frequency losses between ferrites and iron powder cores, superior to ordinary iron powder cores. They also feature distributed air gaps and good temperature stability, offering high cost-effectiveness and making them suitable for cost-sensitive differential-mode magnetic circuit designs with suitable frequencies. Therefore, when differential-mode flux passes through the first and second side pillars, the magnetic materials for both side pillars should be selected from ferrite, FeNiMo, and FeSiA to meet the requirement of using low-loss magnetic materials along the differential-mode flux path.

[0019] Due to its high saturation magnetic flux density, iron-nickel alloy has the strongest DC bias resistance among all magnetic powder cores, capable of withstanding extremely high low-frequency current amplitudes without saturation. Simultaneously, it exhibits minimal magnetostriction and quiet operation, making it the best choice for common-mode magnetic circuits handling harsh bias conditions. Iron-silicon-aluminum alloy has a relatively high saturation magnetic flux density and inherent bias resistance due to distributed air gaps, offering high cost-effectiveness and reliable anti-saturation performance under moderate common-mode current amplitudes and non-extreme bias conditions. Iron-based amorphous materials have high saturation magnetic flux density, significantly lower low-frequency losses than traditional silicon steel sheets, and excellent anti-saturation capabilities, making them suitable for common-mode magnetic circuits with low-frequency, high-current, high magnetic flux density, and certain loss requirements. Therefore, when common-mode magnetic flux passes through the first and second side pillars, the magnetic materials for both side pillars should be selected from iron-nickel alloy, iron-silicon-aluminum, and iron-based amorphous materials to meet the requirement of using magnetic materials with good anti-saturation bias characteristics along the common-mode magnetic flux path.

[0020] In one implementation, along the second direction, the first side post is located on the side of the first magnetic post opposite to the second magnetic post, and the second side post is located on the side of the second magnetic post opposite to the first magnetic post.

[0021] When the first side post is located on the side of the first magnetic post away from the second magnetic post and the second side post is located on the side of the second magnetic post away from the first magnetic post, the first side post is located on one side of the two magnetic posts and the second side post is located on the other side of the two magnetic posts. The two magnetic posts and two side posts of the magnetic core are arranged along the second direction, which can reduce the size of the magnetic core along the third direction (i.e., the direction perpendicular to the first direction and the second direction respectively). This allows the integrated inductor to be used in narrow and long inductor housings or in narrow and long spaces, and can meet the installation requirements in some special scenarios.

[0022] In one implementation, there are multiple magnetic cores arranged sequentially along a second direction. The second side post of one of the two adjacent magnetic cores and the first side post of the other of the two adjacent magnetic cores are integral structural components. A first winding is wound around the outer periphery of the first magnetic post in each magnetic core, and a second winding is wound around the outer periphery of the second magnetic post in each magnetic core.

[0023] When integrated inductors are expanded to multiphase integration, the common-mode and differential-mode inductances generated by the two windings of each phase switch arm can be largely decoupled. Compared to some three-column integrated inductors (which suffer from high coupling between common-mode and differential-mode flux paths in single-phase integrated inductors, and cannot solve the saturation risk and design decoupling difficulties caused by interphase magnetic coupling after multiphase integration), the magnetic circuit of the multiphase integrated inductor structure in this application is simpler and easier to expand into multiphase. Furthermore, by making the second column of one of two adjacent magnetic cores and the first column of the other of the two adjacent magnetic cores a single structural component, i.e., sharing the columns between adjacent magnetic cores, both size and volume can be reduced, as well as the amount of magnetic material used, thus lowering costs.

[0024] In one implementation, the first side post and the first magnetic post are arranged along a third direction, and the second side post and the second magnetic post are arranged along a third direction, with the third direction, the first direction, and the second direction being perpendicular to each other.

[0025] When this application adopts the above configuration, regardless of whether the same-name terminals are coupled in the same direction or in opposite directions, the arrangement of the first and second side posts can still achieve basic decoupling of the differential-mode flux path and the common-mode flux path. Furthermore, when the first side post and the first magnetic post are arranged along a third direction, and the second side post and the second magnetic post are also arranged along a third direction, the two magnetic posts of the core are arranged along a second direction, and the corresponding magnetic posts and corresponding side posts are arranged along a third direction. This avoids the overall structure of the integrated inductor becoming too large along a certain direction, thus achieving a relatively balanced size across all directions. The integrated inductor of this application, using this structural layout, can meet the layout requirements in relatively square and regular spaces, satisfying the installation needs of most common scenarios.

[0026] In one implementation, along a third direction, the first side post and the second side post are located on the same side of the first magnetic yoke.

[0027] When the first and second side posts are located on the same side of the first yoke, the size of the magnetic core along the third direction can be shortened. On the other hand, when the first and second side posts are located on the same side, the integrated inductor includes two magnetic cores for two-phase integration. The two magnetic cores can share the first and second side posts, and the first and second side posts can be fully utilized to maximize material utilization.

[0028] In one implementation, there are multiple magnetic cores arranged sequentially along a third direction. These cores include adjacent first and second magnetic cores. The first side posts of the first and second magnetic cores face each other and are integral structural components. Similarly, the second side posts of the first and second magnetic cores face each other and are integral structural components. A first winding is wound around the outer periphery of the first magnetic post in each core, and a second winding is wound around the outer periphery of the second magnetic post in each core.

[0029] When the integrated inductor is expanded to a multiphase integrated structure, the common-mode and differential-mode inductances generated by the two windings of each phase switch arm can be essentially decoupled. Compared to the three-column integrated inductors in some other solutions, the magnetic circuit of the multiphase integrated inductor structure in this application is simpler and easier to expand into multiple phases. Furthermore, by making the side columns of the first and second magnetic cores a single structural component, a shared structure can be achieved, reducing both size and volume, as well as the amount of magnetic material used, thus lowering costs.

[0030] In one implementation, the second magnetic core includes two first side posts along a third direction, located on opposite sides of the first magnetic post. The first side post of the second magnetic core closer to the first magnetic post faces each other and is an integral structural component. The second magnetic core also includes two second side posts along a third direction, located on opposite sides of the second magnetic post. The second side post of the second magnetic core closer to the first magnetic post faces each other and is an integral structural component. The multiple magnetic cores further include a third magnetic core along a third direction, located on the side of the second magnetic core away from the first magnetic core. The first side post of the third magnetic core faces each other and is an integral structural component, as does the second side post of the second magnetic core away from the first magnetic core.

[0031] This application sets two first side posts of the second magnetic core and two second side posts of the second magnetic core. The first side post of the second magnetic core that is opposite to the first magnetic core and the first side post of the third magnetic core are set as an integral structural component, which can realize the shared structure of the two. The second side post of the second magnetic core that is opposite to the first magnetic core and the second side post of the third magnetic core are set as an integral structural component, which can realize the shared structure. It is beneficial to add a third magnetic core on the side of the second magnetic core that is opposite to the first magnetic core, so as to expand one more phase and realize three-phase integration.

[0032] In one implementation, the first side post includes two, which are located on opposite sides of the first magnetic post along a third direction; the second side post includes two, which are located on opposite sides of the second magnetic post along a third direction.

[0033] By including two first side pillars and two second side pillars, the two first side pillars can share the magnetic flux, thus reducing the risk of magnetic saturation; similarly, the two second side pillars can share the magnetic flux, thus reducing the risk of magnetic saturation.

[0034] In one implementation, the first side post includes a first part and a second part, both connected to the two ends of the first magnetic post. The first part is located on the side of the first magnetic post facing away from the second magnetic post, and the second part and the first magnetic post are arranged along a third direction, with the third direction, the first direction, and the second direction being perpendicular to each other. The second side post includes a third part and a fourth part, both connected to the two ends of the second magnetic post. The third part is located on the side of the second magnetic post facing away from the first magnetic post, and the fourth part and the second magnetic post are arranged along a third direction.

[0035] The first side post of this application is provided with a first part and a second part, and the second side post is provided with a third part and a fourth part. The first side post can reduce the risk of magnetic material saturation by having the first part and the second part jointly bear the magnetic flux passing through the first side post. Similarly, the second side post can reduce the risk of magnetic material saturation by having the third part and the fourth part jointly bear the magnetic flux passing through the second side post.

[0036] In one implementation, along a third direction, the second and fourth portions are located on the same side of the first yoke.

[0037] When the second and fourth parts are located on the same side of the first yoke, the size of the magnetic core along the third direction can be shortened. When the integrated inductor includes two magnetic cores for two-phase integration, the two magnetic cores can share the second and fourth parts, and the second and fourth parts can be fully utilized to maximize material utilization.

[0038] In one implementation, there are multiple magnetic cores arranged sequentially along a third direction. These cores include adjacent first and second magnetic cores. A second portion of the first magnetic core and a second portion of the second magnetic core are positioned facing each other and are integral structural components. A fourth portion of the first magnetic core and a fourth portion of the second magnetic core are also positioned facing each other and are integral structural components. A first winding is wound around the outer periphery of the first magnetic post in each core, and a second winding is wound around the outer periphery of the second magnetic post in each core.

[0039] When the integrated inductor is expanded to multiphase integration, the common-mode and differential-mode inductances generated by the two windings of each phase switch arm can be basically decoupled. Compared with some other solutions, the magnetic circuit of the multiphase integrated inductor structure of this application is simpler and easier to expand into multiphase. In addition, by making the second and fourth parts of the adjacent first and second magnetic cores into a single structural component, structural sharing can be achieved, which can reduce size and volume, as well as reduce the amount of magnetic material used, thereby reducing costs.

[0040] In one implementation, the second magnetic core comprises two second portions along a third direction, located on opposite sides of the first magnetic post. The second portion of the second magnetic core closer to the first magnetic core faces the second portion of the first magnetic core and is an integral structural component. The second magnetic core also comprises two fourth portions along a third direction, located on opposite sides of the second magnetic post. The fourth portion of the second magnetic core closer to the first magnetic core faces the fourth portion of the first magnetic core and is an integral structural component. The plurality of magnetic cores further includes a third magnetic core along a third direction, located on the side of the second magnetic core facing away from the first magnetic core. The second portion of the third magnetic core faces the second portion of the second magnetic core facing away from the first magnetic core and is an integral structural component, as are the fourth portions of the third magnetic core and the fourth portions of the second magnetic core facing away from the first magnetic core and are an integral structural component.

[0041] This application sets both the second part and the fourth part of the second magnetic core as two separate units. The second part of the second magnetic core that is opposite to the first magnetic core and the second part of the third magnetic core are set as an integral structural component, which enables the two to share the same structure. The fourth part of the second magnetic core that is opposite to the first magnetic core and the fourth part of the third magnetic core are set as an integral structural component, which also enables the two to share the same structure. This is beneficial for adding a third magnetic core on the side of the second magnetic core that is opposite to the first magnetic core, so as to extend one more phase and realize three-phase integration.

[0042] In one implementation, the second part comprises two parts, which are located on opposite sides of the first magnetic post along a third direction; the fourth part comprises two parts, which are located on opposite sides of the second magnetic post along a third direction.

[0043] This application enables the second part to consist of two parts, and the first part and the two second parts can jointly bear the magnetic flux through the first side post, thereby reducing the risk of magnetic material saturation; similarly, when the fourth part consists of two parts, the third part and the two fourth parts can jointly bear the magnetic flux through the second side post, thereby reducing the risk of magnetic material saturation.

[0044] In one implementation, there are multiple magnetic cores arranged sequentially along a third direction. The second portion of one of two adjacent magnetic cores and the second portion of the other two adjacent magnetic cores are positioned facing each other and are integral structural components. Similarly, the fourth portion of one of two adjacent magnetic cores and the fourth portion of the other two adjacent magnetic cores are positioned facing each other and are integral structural components. A first winding is wound around the outer periphery of the first magnetic post in each magnetic core, and a second winding is wound around the outer periphery of the second magnetic post in each magnetic core.

[0045] When the integrated inductor is expanded into a multiphase integrated inductor, the common-mode and differential-mode inductances generated by the two windings of each phase switch arm can be basically decoupled. Therefore, the magnetic circuit of the multiphase integrated inductor structure of this application is relatively simple and easy to expand into a multiphase inductor. In addition, since each side post of this multiphase integrated inductor has at least multiple parts (the first side post includes a first part and two second parts, and the second side post includes a third part and two fourth parts), the risk of magnetic saturation can also be reduced.

[0046] In one implementation, both the first and second magnetic pillars are disposed between the first and second magnetic yokes, with one end of each pillar connected to the sidewall of the first yoke facing the second yoke, and the other ends of both pillars connected to the sidewall of the second yoke facing the first yoke. One end of the first pillar is connected to the end of the first yoke away from the second pillar and is also connected to one end of the first magnetic pillar via the first yoke; the other end is connected to the end of the second yoke away from the second pillar and is also connected to the other end of the first magnetic pillar via the second yoke. Similarly, one end of the second pillar is connected to the end of the first yoke away from the first pillar and is also connected to one end of the second magnetic pillar via the first yoke; the other end is connected to the end of the second yoke away from the first pillar and is also connected to one end of the second magnetic pillar via the second yoke.

[0047] With the above configuration, both ends of the first side post and both ends of the second side post are directly connected to the ends of the first and second magnetic yokes, thus achieving connection with the first and second magnetic posts through the first and second magnetic yokes. That is, in this implementation, both ends of the first side post are indirectly connected to both ends of the first magnetic post, and both ends of the second side post are indirectly connected to both ends of the second magnetic post, providing an optional method for connecting the two side posts.

[0048] In one implementation, both the first and second magnetic yokes are disposed between the first and second magnetic pillars, with one end of each yoke connected to the sidewall of the first magnetic pillar facing the second magnetic pillar, and the other ends of both yokes connected to the sidewall of the second magnetic pillar facing the first magnetic pillar. The two ends of the first side pillar are in contact with the two ends of the first magnetic pillar, and the two ends of the second side pillar are in contact with the two ends of the second magnetic pillar.

[0049] In this implementation, the two ends of the first side post are directly connected to the two ends of the first magnetic post, and the two ends of the second side post are directly connected to the two ends of the second magnetic post, providing another optional method for connecting the two side posts. Furthermore, with this connection method, both the first and second magnetic yokes are positioned between the first and second magnetic posts. If one of the common-mode flux and the differential-mode flux forms a closed loop magnetic circuit through the corresponding magnetic post and corresponding side post (the flux generated by the first winding forms a closed loop magnetic circuit through the first side post, and the flux generated by the second winding forms a closed loop magnetic circuit through the second side post), and the other forms a closed loop magnetic circuit through the first magnetic post, the first magnetic yoke, the second magnetic post, and the second magnetic yoke, then one of the differential-mode flux and the common-mode flux passes through the first and second magnetic yokes (the other does not), and the other passes through the first and second side posts (one does not). This results in better decoupling of the differential-mode flux path and the common-mode flux path. Independent optimization of differential mode and common mode sensitivity can be achieved by designing the parameters (such as size or material) of the first and second yokes and / or the parameters of the two side pillars.

[0050] On the other hand, this application provides a power converter, which includes a housing, a circuit board, a power circuit, and an integrated inductor in any of the above implementations; wherein: the housing is used to house the circuit board and the power circuit, and both the power circuit and the integrated inductor are electrically connected to the circuit board.

[0051] The power converter provided in this application includes an integrated inductor as described in any of the above implementations. Therefore, this power converter can at least improve the problem of high coupling between the differential-mode flux path and the common-mode flux path in the integrated inductor, which is beneficial for the independent optimization design of the differential-mode inductance and the common-mode inductance.

[0052] In one implementation, the power circuit is an interleaved parallel inverter circuit, including three-phase switch arms in parallel, each switch arm including two half-bridge units in parallel; the midpoint of each half-bridge unit serves as the output terminal of the switch arm, and the three switch arms are used to convert DC power into three-phase AC power with the same frequency but different phases.

[0053] The integrated inductor includes three first windings and three second windings. One end of each of the three first windings is connected to the bridge arm output terminal of one half-bridge unit of one phase of the three-phase switch bridge arm. One end of each of the three second windings is connected to the bridge arm output terminal of the other half-bridge unit of one phase of the three-phase switch bridge arm. The first winding and the second winding connected to the bridge arm output terminals of the two half-bridge units of one phase switch bridge arm are connected in parallel to form one phase output terminal.

[0054] This application applies the integrated inductor in any of the above implementation methods to a power converter with an interleaved parallel inverter circuit. Because it can achieve independent optimization of differential mode inductance and common mode inductance, it is beneficial to integrate multiphase inductors in the interleaved parallel inverter circuit, and can reduce the number of components in the power converter, reduce assembly difficulty, and reduce material costs. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the differential mode current flow direction of the switch bridge arm provided in an embodiment of this application; Figure 2 This is a schematic diagram of the common-mode current flow direction of the switch bridge arm provided in an embodiment of this application; Figure 3 This application provides an example of an interleaved parallel circuit topology for a three-phase inverter. Figure 4 This is a schematic diagram of the power converter provided in the embodiments of this application; Figure 5 Differential mode flux distribution diagram of integrated inductors in some solutions provided in the embodiments of this application when they are coupled in the same direction at the same terminals; Figure 6 Common-mode flux distribution diagram of integrated inductors in some solutions provided in the embodiments of this application when they are coupled in the same direction at the same terminals; Figure 7 Differential mode flux distribution diagram of integrated inductors in some solutions provided in the embodiments of this application when they are reverse coupled at the same-name terminals; Figure 8 Common-mode flux distribution diagram of integrated inductors in some solutions provided in the embodiments of this application when they are reverse-coupled at the same-name terminals; Figure 9 This is one of the structural schematic diagrams of an integrated inductor provided in an embodiment of this application; Figure 10 This is a second schematic diagram of the structure of an integrated inductor provided in an embodiment of this application; Figure 11 for Figure 10 Front view of the integrated inductor; Figure 12 for Figure 10 Magnetic flux distribution diagram of integrated inductors when they are coupled in the same direction at the same terminals; Figure 13 for Figure 10 The magnetic flux distribution diagram of an integrated inductor when it is reverse-coupled at the same-name terminals; Figure 14 for Figure 10 A schematic diagram of the structure of a multiphase integrated inductor; Figure 15 for Figure 14 The main view of the structure; Figure 16The third schematic diagram of the integrated inductor provided in the embodiments of this application; Figure 17 for Figure 16 Common-mode flux distribution diagram of integrated inductors when they are coupled in the same direction at the same terminals; Figure 18 for Figure 16 Differential-mode flux distribution diagram of integrated inductors when they are coupled in the same direction at the same terminals; Figure 19 for Figure 16 Differential-mode flux distribution diagram of integrated inductor when reverse coupling occurs at the same-name terminals; Figure 20 for Figure 16 Common-mode flux distribution diagram of integrated inductors when reverse coupling occurs at the same-name terminals; Figure 21 for Figure 16 A schematic diagram of the structure of a multiphase integrated inductor; Figure 22 Fourth schematic diagram of the integrated inductor provided in the embodiments of this application; Figure 23 Fifth schematic diagram of the integrated inductor provided in the embodiments of this application; Figure 24 for Figure 23 Front view of the integrated inductor; Figure 25 for Figure 23 Right view of the integrated inductor; Figure 26 for Figure 23 A schematic diagram of the structure of a multiphase integrated inductor; Figure 27 for Figure 26 Left view of the middle structure; Figure 28 Sixth schematic diagram of the integrated inductor provided in the embodiments of this application; Figure 29 for Figure 28 Left view of the middle structure; Figure 30 for Figure 28 Common-mode flux distribution diagram of integrated inductors when they are coupled in the same direction at the same terminals; Figure 31 for Figure 28 Differential-mode flux distribution diagram of integrated inductors when they are coupled in the same direction at the same terminals; Figure 32 for Figure 28 Differential-mode flux distribution diagram of integrated inductor when reverse coupling occurs at the same-name terminals; Figure 33 for Figure 28 Common-mode flux distribution diagram of integrated inductors when reverse coupling occurs at the same-name terminals; Figure 34 for Figure 28 A schematic diagram of the structure of a multiphase integrated inductor; Figure 35 for Figure 34 Left view of the structure.

[0056] Figure label: 01-Three-phase inverter; 011-Power circuit; 012-Filter circuit; 100-Power Converter; 10-Integrated inductor; 11-Magnetic core; 111-First yoke; 112-Second yoke; 113-First magnetic pillar; 114-Second magnetic pillar; 115-First side pillar; 1151-First section; 1152-Second section; 116-Second side pillar; 1161-Third section; 1162-Fourth section; 12 - First winding; 13 - Second winding; 20 - Shell; 30 - Circuit board; 40 - Power devices. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] The terms "first," "second," and similar terms used herein do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar terms, do not indicate a quantity limitation, but rather indicate the presence of at least one. Furthermore, in the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0059] Before introducing this application, for ease of understanding, the terms that will be used below will be explained as follows: 1. Same-name terminals: These are markings describing the relative winding directions of the windings in an integrated inductor. When current flows into the two windings from their same-name terminals, the magnetic flux they produce is in the same direction in the magnetic circuit and mutually reinforces each other. Conversely, if current flows into one winding from its same-name terminal and out from the other, the magnetic flux cancels each other out. In circuit diagrams, for simplicity, the winding direction is generally not shown. Therefore, a special mark is needed to represent this winding direction; these special marks are "•" and "×". Their meaning is that the current and reference direction in both windings flow into (or out of) the terminal marked with "•", so the mutual magnetic flux produced by the two windings reinforces each other. Thus, we call the two ends marked with "•" on the two windings the same-name terminals, also called same-polarity terminals. Of course, the two ends marked with "×" on the two windings are also same-name terminals. The "•" of one winding and the "×" of another winding are opposite-name terminals.

[0060] 2. Differential mode current: Differential mode current refers to current components that are opposite in direction and equal in magnitude. Generally, the circulating current between single-phase switch bridge arms is defined as differential mode current. Its characteristics are large peak-to-peak value of high-frequency current ripple and large change in magnetic flux density. Figure 1 This is a schematic diagram of the differential mode current flow direction of the switch arm provided in the embodiment of this application. The differential mode current is as follows: Figure 1 The solid line with an arrowhead is shown.

[0061] 3. Common-mode current: Common-mode current refers to current components that are in the same direction (usually pointing towards the load) and of equal magnitude. It is generally defined as the common output current of the switch bridge arms. Its characteristics are large amplitude of low-frequency current and high magnetic flux density. Figure 2 This is a schematic diagram of the common-mode current flow direction of the switching bridge arm provided in an embodiment of this application. The common-mode current is as follows: Figure 2 As shown by the dashed line with the arrow in the middle.

[0062] This application provides an integrated inductor 10 that can be applied in a power converter 100.

[0063] The application scenarios of the power converter 100 are explained by taking the power converter 100 as a three-phase inverter 01 as an example. Figure 3 The interleaved parallel circuit topology of the three-phase inverter 01 provided in the embodiments of this application is as follows: Figure 3As shown, the three-phase inverter 01 includes a power circuit 011 and a filter circuit 012. The power circuit 011 is an interleaved parallel inverter circuit. The input terminal of the power circuit 011 is connected to the DC power supply Vin. The power circuit 011 includes three parallel switching bridge arms, namely the first switching bridge arm 0111, the second switching bridge arm 0112, and the third switching bridge arm 0113. The three switching bridge arms correspond to phases A, B, and C of the three-phase AC power, respectively. Each switching bridge arm is composed of two half-bridge units connected in parallel. Each half-bridge unit includes two power switching transistors connected in series, and each power switching transistor is connected in anti-parallel with a diode to achieve current freewheeling. The midpoint of the connection between the two power switching transistors in the two half-bridge units of each phase switching bridge arm serves as the output terminal of the bridge arm. The three-phase switching bridge arms work together to convert the DC power input from the DC power supply Vin into three-phase AC power with the same frequency but different phases.

[0064] The filter circuit 012 is used to filter the AC power output from the power circuit 011 for each phase and output the filtered AC power to the power grid. The filter circuit 012 includes inductors and capacitors, with each phase input terminal connected to the corresponding bridge arm output terminal of the three switching bridge arms of the power circuit 011. Specifically, the bridge arm output terminal of each phase switching bridge arm is connected to two inductors in the filter circuit 012. These two inductors are connected in series between the bridge arm output terminals of the two half-bridge units of that phase switching bridge arm, and the other ends of the two inductors are connected in parallel to serve as the output terminal of that phase, connected to the power grid.

[0065] In this application, the two inductors connected to the output terminal of each phase switch arm can be integrated together using magnetic integration technology to form an integrated inductor; alternatively, multiple inductors connected to the output terminals of multi-phase switch arms can be integrated together to form an integrated inductor, thereby increasing the power density of the three-phase inverter 01 and reducing its overall size. For example, two inductors connected to a single-phase switch arm can be integrated together; or four inductors connected to a two-phase switch arm can be integrated together; or six inductors connected to a three-phase switch arm can be integrated together. Figure 3 The following is an example of integrating six inductors connected to the three-phase switch bridge arm into an integrated inductor 10.

[0066] Specifically, when the windings of two inductors connected to a phase switch bridge arm are coupled in the same direction with the same name terminals, the ends of the two windings connected to the bridge arm output terminals of the two half-bridge units of the phase switch bridge arm are a pair of same name terminals; when the windings of two inductors connected to a phase switch bridge arm are coupled in opposite directions with the same name terminals, the ends of the two windings connected to the bridge arm output terminals of the two half-bridge units of the phase switch bridge arm are a pair of opposite name terminals.

[0067] It is understood that the above application scenario is only one application of the power converter 100 with integrated inductor 10 provided in the embodiments of this application. In addition to the above scenario, the power converter 100 with integrated inductor 10 of this application can also be applied to other scenarios of power electronic circuits using interleaved parallel circuit topology or scenarios containing multiple inductors, such as in various power electronic power supplies such as energy storage converters, charging piles, and motor drives.

[0068] The specific structure of the power converter 100, which includes the integrated inductor 10, will be described below.

[0069] Figure 4 This is a schematic diagram of the power converter 100 provided in the embodiments of this application, in conjunction with reference to... Figure 3 and Figure 4 As shown, the power converter 100 includes a housing 20, a circuit board 30, a power circuit 011, and an integrated inductor 10. The power circuit 011 is a three-phase interleaved parallel inverter circuit, and the power circuit 011 includes multiple power devices 40.

[0070] The housing 20 is used to house the circuit board 30 and the power circuit 011. The power circuit 011 and the integrated inductor 10 are both electrically connected to the circuit board 30.

[0071] The integrated inductor 10 can be an onboard integrated inductor (i.e., the integrated inductor 10 is directly fixed to the circuit board 30) or a non-onboard integrated inductor (i.e., the integrated inductor 10 is not directly fixed to the circuit board 30, but is electrically connected to the circuit board 30 through copper busbars or other means). Figure 4 The illustration is based on the example of a non-board-mounted integrated inductor 10.

[0072] The integrated inductor 10 includes three first windings and three second windings. One end of each of the three first windings is connected to the bridge arm output terminal of one half-bridge unit of one phase of the three-phase switch bridge arm. One end of each of the three second windings is connected to the bridge arm output terminal of the other half-bridge unit of one phase of the three-phase switch bridge arm. The first windings and second windings connected to the bridge arm output terminals of the two half-bridge units of one phase switch bridge arm are connected in parallel to form one phase output terminal.

[0073] That is, the integrated inductor 10 can be connected to phase A, as well as phases B and C. A first winding and a second winding are connected in series between the output terminals of the two half-bridge units of the phase A switch bridge arm, another first winding and another second winding are connected in series between the output terminals of the two half-bridge units of the phase B switch bridge arm, and yet another first winding and yet another second winding are connected in series between the output terminals of the two half-bridge units of the phase C switch bridge arm.

[0074] In the case where the first winding and the second winding connected to the output terminals of the two half-bridge units of a single-phase switch bridge arm are coupled in the same direction with the same name, the ends of the first winding and the second winding connected to the output terminals of the two half-bridge units are a pair of same name terminals; in the case where the first winding and the second winding connected to the output terminals of the two half-bridge units of a single-phase switch bridge arm are coupled in opposite directions with the same name terminals, the ends of the first winding and the second winding connected to the output terminals of the two half-bridge units are a pair of opposite name terminals.

[0075] That is, when the first winding and the second winding connected to the output terminals of the two half-bridge units of the A-phase switch arm are coupled in the same direction using the same-name terminals, the ends of the first winding and the second winding connected to the output terminals of the two half-bridge units are a pair of same-name terminals; when the first winding and the second winding connected to the output terminals of the two half-bridge units of the A-phase switch arm are coupled in opposite directions using the same-name terminals, the ends of the first winding and the second winding connected to the output terminals of the two half-bridge units are a pair of opposite-name terminals. The same applies to the first winding and the second winding connected to the B-phase switch arm and the first winding and the second winding connected to the C-phase switch arm, and will not be described again in this application.

[0076] For example, the integrated inductor 10 can be a single component or an integral structure, or it can include multiple components. When the integrated inductor 10 is a single component, it integrates three first windings and three second windings onto one component; or, in other words, the magnetic cores corresponding to the three single-phase windings are connected together. That is, the magnetic cores corresponding to phase A, phase B, and phase C windings are connected together to form an integral or integral structure.

[0077] When the integrated inductor 10 is a single component or an integral structural part, it can reduce the number of parts in the power converter, reduce assembly difficulty, and reduce material costs.

[0078] When the integrated inductor 10 includes multiple components, for example, the integrated inductor 10 includes two or three components.

[0079] Taking the integrated inductor 10, which includes three components, as an example, each component of the integrated inductor 10 is connected to one phase switch bridge arm, and the three components are connected one-to-one with the three-phase switch bridge arms. Each component includes a first winding and a second winding. One end of the first winding is connected to the bridge arm output terminal of one half-bridge unit of one phase switch bridge arm in the three-phase switch bridge arm, and one end of the second winding is connected to the bridge arm output terminal of the other half-bridge unit of the same phase switch bridge arm. The other ends of the first winding and the other ends of the second winding are connected in parallel to form one phase output terminal.

[0080] That is, the integrated inductor 10 includes three components, which are respectively connected to phases A, B, and C of the three switch bridge arms. Specifically, when the first and second windings of the component connected to the phase A switch bridge arm are coupled in the same direction using their same-name terminals, the ends of the first and second windings connected to the output terminals of the two half-bridge units are a pair of same-name terminals; when the first and second windings of the component connected to the phase A switch bridge arm are coupled in opposite directions using their same-name terminals, the ends of the first and second windings connected to the output terminals of the two half-bridge units are a pair of opposite-name terminals. The components connected to the phase B switch bridge arm and the components connected to the phase C switch bridge arm are similarly described, and will not be repeated in this application.

[0081] When the integrated inductor 10 includes three components, each component is connected to a phase switch bridge arm. Each component has a simple structure, is easy to manufacture, has low implementation difficulty, and is easy to apply.

[0082] When the integrated inductor 10 includes two components, two phase windings can be integrated on one component, and the other phase winding can be integrated on another component. For example, phase A and phase B windings are integrated on one component of the integrated inductor 10, and phase C winding is integrated separately on another component of the integrated inductor 10; or, phase A and phase C windings are integrated on one component of the integrated inductor 10, and phase B winding is integrated separately on another component of the integrated inductor 10; or, phase B and phase C windings are integrated on one component of the integrated inductor 10, and phase A winding is integrated separately on another component of the integrated inductor 10.

[0083] That is, the integrated inductor 10 of this application can be a single-phase winding integration, that is, a first winding and a second winding connected to a single-phase switch bridge arm can be integrated together; or it can be a multi-phase winding integration, for example, two first windings and two second windings connected to a two-phase switch bridge arm can be integrated together, or three first windings and three second windings connected to a three-phase switch bridge arm can be integrated together.

[0084] The specific structure of the integrated inductor 10 of this application will be described below.

[0085] To facilitate understanding and comparison with the integrated inductor 10 provided in this application, before introducing the specific structure of the integrated inductor 10 provided in this application, we will first take a three-column integrated inductor in some schemes as an example to introduce and explain the magnetic flux distribution when differential mode current and common mode current are applied to the switching bridge arm.

[0086] For some three-column integrated inductors (including two yokes, two columns connected between the two yokes, and a middle column located between the two columns), taking the two windings coupled in the same direction at their corresponding terminals as an example (when the two windings are coupled in the same direction at their corresponding terminals, the self-magnetic flux and mutual magnetic flux generated by the currents in the two windings reinforce each other, while the self-magnetic flux and mutual magnetic flux generated by the currents in the two windings weaken each other when the currents are applied in opposite directions), Figure 5 Differential-mode flux distribution diagrams of integrated inductors in some solutions provided in the embodiments of this application when they are coupled in the same direction at the same terminals. Figure 6 The common-mode flux distribution diagram of the integrated inductor in some solutions provided in the embodiments of this application when coupled in the same direction at the same terminals is shown in the figure. Figure 5 and Figure 6 It can be seen that, Figure 5 and Figure 6 The right terminal of the left magnetic post and the left terminal of the right magnetic post are of the same name, and the left terminal of the left magnetic post and the right terminal of the right magnetic post are of the same name. For ease of understanding the magnetic flux path, in... Figure 5 and Figure 6 The winding directions of the two windings are shown in the diagram.

[0087] It can be seen that when two windings are coupled in the same direction at the same terminals, referring to Figure 5 As shown, when a differential-mode current is applied, the current flows into one winding from the same-named end and out of the other winding from the same-named end. The magnetic fields generated by the two currents in their respective windings, according to the right-hand screw rule, are both upwards. The magnetic flux generated by the left winding forms a small closed loop clockwise through the middle column, and the magnetic flux generated by the right winding forms a small closed loop counterclockwise through the middle column. The self-magnetic flux and mutual magnetic flux generated by the currents in the two windings weaken each other. The magnetic flux generated by the left winding and the right winding superimposes at the middle column. That is, as... Figure 5 As shown, when the same-named terminals are coupled in the same direction, the differential mode flux of the middle column, which acts as a decoupling column, is transmitted.

[0088] Reference Figure 6 It can be seen that when a common-mode current is applied, the current flows into both windings from the same terminal. The magnetic fields generated by the two currents in their respective windings, according to the right-hand screw rule, are respectively downwards and upwards. The magnetic fluxes generated by the left and right windings both form a large outer loop closed clockwise through the upper and lower yokes and the two magnetic pillars. The self-magnetic flux and mutual magnetic flux generated by the currents in the two windings reinforce each other. The magnetic fluxes generated by the left and right windings cancel each other out at the middle pillar. That is, as... Figure 6 As shown, when the terminals of the same name are coupled in the same direction, the common mode magnetic flux flows through the outer large loop to form a closed loop.

[0089] according to Figure 5 and Figure 6It can be seen that in some schemes of three-column integrated inductors, when the two windings are coupled in the same direction with the same name terminals, the differential mode magnetic flux path forms a small loop closed through their respective magnetic columns, upper and lower yokes and middle column, while the common mode magnetic flux path forms an outer large loop closed through the upper and lower yokes and the two magnetic columns.

[0090] Figure 7 The differential-mode flux distribution diagram of the integrated inductor in some solutions provided in the embodiments of this application when the same-name terminals are reverse coupled. Figure 8 The common-mode flux distribution diagram of the integrated inductor in some solutions provided in the embodiments of this application when reverse coupling occurs at the same-name terminals is shown in the reference diagram. Figure 7 and Figure 8 It can be seen that, Figure 7 and Figure 8 The right-side terminals of the left and right magnetic pillars are of the same name, and the left-side terminals of the left and right magnetic pillars are of the same name. For ease of understanding the magnetic flux path, in... Figure 7 and Figure 8 The winding directions of the two windings are shown in the diagram.

[0091] It can be seen that when two windings are coupled in reverse at their same-name terminals, refer to Figure 7 As shown, when a differential-mode current is applied, the current flows into one winding from the same-named end and out of the other winding from the same-named end. The magnetic fields generated by these two currents in their respective windings, according to the right-hand screw rule, are respectively downwards and upwards. The magnetic fluxes generated by the left and right windings both pass clockwise through the upper and lower yokes and the two magnetic pillars, forming a closed outer large loop. The self-magnetic flux and mutual magnetic flux generated by the currents in the two windings reinforce each other. The magnetic fluxes generated by the left and right windings cancel each other out at the middle pillar. That is, as... Figure 7 As shown, when the same-name terminals are coupled in opposite directions, the differential-mode magnetic flux flows through the outer large loop to form a closed loop.

[0092] Reference Figure 8 As shown, when a common-mode current is applied, the current flows into both windings from the same terminal. The magnetic fields generated by the two currents in their respective windings' corresponding magnetic columns, according to the right-hand screw rule, are both upwards. The magnetic flux generated by the left winding forms a small closed loop clockwise through the middle column, while the magnetic flux generated by the right winding forms a small closed loop counterclockwise through the middle column. The self-magnetic flux and mutual magnetic flux generated by the currents in the two windings weaken each other. The magnetic flux generated by the left winding and the right winding superimpose at the middle column. That is, as... Figure 8 As shown, when the same-named terminals are coupled in reverse, the middle pillar, which acts as a decoupling pillar, carries common-mode magnetic flux. That is, as... Figure 8 As shown, when the same-named terminals are coupled in reverse, the middle column, which acts as a decoupling column, carries common-mode magnetic flux.

[0093] according to Figure 7 and Figure 8 It can be seen that in some three-column integrated inductors, when the two windings are coupled in reverse with the same name terminals, the common-mode magnetic flux path forms a small loop closed through their respective magnetic columns, upper and lower yokes and middle column, while the differential-mode magnetic flux path forms an outer large loop closed through the upper and lower yokes and the two magnetic columns.

[0094] Based on the above analysis, in some three-pillar integrated inductors, regardless of whether the same-name terminals are coupled in the same direction or in opposite directions, one of the differential-mode flux path and the common-mode flux path forms a small closed loop through their respective magnetic pillars, upper and lower yokes, and the middle pillar, while the other forms a large closed loop through the upper and lower yokes and the two magnetic pillars. However, since the middle pillar, acting as a decoupling pillar, is located between the two magnetic pillars, the size of the middle pillar (especially its width dimension) is... Figure 5 and Figure 6 The changes in the horizontal direction and the spacing between the two magnetic pillars will affect both the common-mode and differential-mode magnetic flux paths, resulting in high coupling between the two types of magnetic circuits. This causes the differential-mode inductance and common-mode inductance to be mutually constrained during the design process, making it impossible to achieve decoupled design and independent optimization. This limits the flexible adjustment capability of the three-pillar integrated inductor in terms of ripple suppression and common-mode filtering performance, making it difficult to meet the system's differentiated requirements for differential-mode filtering and common-mode suppression.

[0095] Next, the specific structure of the integrated inductor 10 provided in this application will be described.

[0096] Figure 9 This is one of the structural schematic diagrams of the integrated inductor 10 provided in the embodiments of this application, such as... Figure 9 As shown, the integrated inductor 10 includes a magnetic core 11, a first winding 12, and a second winding 13.

[0097] The magnetic core 11 includes a first magnetic yoke 111, a second magnetic yoke 112, a first magnetic pillar 113, a second magnetic pillar 114, a first side pillar 115, and a second side pillar 116. The first magnetic yoke 111 and the second magnetic yoke 112 are spaced apart along a first direction Z, and the first magnetic pillar 113 and the second magnetic pillar 114 are spaced apart along a second direction X. One end of each of the first magnetic pillars 113 and 114 is connected to the first magnetic yoke 111, and the other end is connected to the second magnetic yoke 112. The first direction Z is perpendicular to the second direction X. The two ends of the first side pillar 115 are respectively connected to the two ends of the first magnetic pillar 113, and the two ends of the second side pillar 116 are respectively connected to the two ends of the second magnetic pillar 114.

[0098] The first winding 12 is wound around the outer periphery of the first magnetic post 113, and the second winding 13 is wound around the outer periphery of the second magnetic post 114.

[0099] That is, in this application, the first magnetic post 113 and the second magnetic post 114 used for winding the integrated inductor 10 are arranged close to each other (i.e. there is no side post between the first magnetic post 113 and the second magnetic post 114 as a decoupling post), the first side post 115 is arranged outside the first magnetic post 113, and the second side post 116 is arranged outside the second magnetic post 114, that is, neither the first side post 115 nor the second side post 116 is arranged between the first magnetic post 113 and the second magnetic post 114.

[0100] In addition, the two ends of the first side post 115 are respectively connected to the two ends of the first magnetic post 113, and the two ends of the second side post 116 are respectively connected to the two ends of the second magnetic post 114. The connection between the two ends of the first side post 115 and the first magnetic post 113 can be a direct connection or an indirect connection; the connection between the two ends of the second side post 116 and the second magnetic post 114 can be a direct connection or an indirect connection.

[0101] For example, in one implementation, such as Figure 9 As shown, the first magnetic yoke 111 and the second magnetic yoke 112 are both disposed between the first magnetic post 113 and the second magnetic post 114. One end of the first magnetic yoke 111 and one end of the second magnetic yoke 112 are both connected to the side wall of the first magnetic post 113 facing the second magnetic post 114, and the other end of the first magnetic yoke 111 and the other end of the second magnetic yoke 112 are both connected to the side wall of the second magnetic post 114 facing the first magnetic post 113. The two ends of the first side post 115 are in contact with the two ends of the first magnetic post 113, and the two ends of the second side post 116 are in contact with the two ends of the second magnetic post 114.

[0102] That is, in this implementation, the two ends of the first side post 115 are directly connected to the two ends of the first magnetic post 113, and the two ends of the second side post 116 are directly connected to the two ends of the second magnetic post 114, providing another optional way to connect the two side posts.

[0103] Furthermore, with this connection method, the first magnetic yoke 111 and the second magnetic yoke 112 are both located between the first magnetic post 113 and the second magnetic post 114. If one of the common-mode magnetic flux and the differential-mode magnetic flux forms a closed loop magnetic circuit through the corresponding magnetic post and the corresponding side post (the magnetic flux generated by the first winding 12 forms a closed loop magnetic circuit through the first side post 115, and the magnetic flux generated by the second winding 13 forms a closed loop magnetic circuit through the second side post 116), and the other forms a closed loop magnetic circuit through the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112, then one of the differential-mode magnetic flux and the common-mode magnetic flux passes through the first magnetic yoke 111 and the second magnetic yoke 112 (the other does not pass through), and the other passes through the first side post 115 and the second side post 116 (the other does not pass through). The decoupling effect of the differential-mode magnetic flux path and the common-mode magnetic flux path is better. Independent optimization of differential mode sensitivity and common mode sensitivity can be achieved by designing the parameters (such as size or material) of the first yoke 111 and the second yoke 112 and / or the parameters of the two side pillars.

[0104] For example, in another implementation, Figure 10 This is the second schematic diagram of the integrated inductor 10 provided in the embodiments of this application. Figure 11 for Figure 10 The front view of the integrated inductor 10, as shown Figure 10 or Figure 11 As shown, the first magnetic post 113 and the second magnetic post 114 are both disposed between the first magnetic yoke 111 and the second magnetic yoke 112. One end of the first magnetic post 113 and one end of the second magnetic post 114 are connected to the side wall of the first magnetic yoke 111 facing the second magnetic yoke 112, and the other end of the first magnetic post 113 and the other end of the second magnetic post 114 are connected to the side wall of the second magnetic yoke 112 facing the first magnetic yoke 111. In this case, one end of the first side post 115 is connected to the end of the first magnetic yoke 111 away from the second side post 116 and is connected to one end of the first magnetic post 113 through the first magnetic yoke 111, and the other end is connected to the end of the second magnetic yoke 112 away from the second side post 116 and is connected to the other end of the first magnetic post 113 through the second magnetic yoke 112. One end of the second side post 116 is connected to the end of the first magnetic yoke 111 that is away from the first side post 115 and is connected to one end of the second magnetic post 114 through the first magnetic yoke 111. The other end is connected to the end of the second magnetic yoke 112 that is away from the first side post 115 and is connected to one end of the second magnetic post 114 through the second magnetic yoke 112.

[0105] In this implementation, both ends of the first side post 115 and both ends of the second side post 116 are directly connected to the ends of the first magnetic yoke 111 and the second magnetic yoke 112, and are connected to the first magnetic post 113 and the second magnetic post 114 through the first magnetic yoke 111 and the second magnetic yoke 112. That is, in this implementation, both ends of the first side post 115 are indirectly connected to both ends of the first magnetic post 113, and both ends of the second side post 116 are indirectly connected to both ends of the second magnetic post 114.

[0106] For example, when the two ends of the first side post 115 and the first magnetic post 113 are indirectly connected, and the two ends of the second side post 116 and the second magnetic post 114 are indirectly connected, as follows: Figure 10 As shown, the first magnetic yoke 111 may include three parts fixed together (the three parts belong to three components and are arranged sequentially along the second direction X, with adjacent parts fixed together by means of adhesive bonding, etc.), so as Figure 10 Taking the orientation shown as an example, the left part connects the top of the first side post 115 and the top of the first magnetic post 113, the middle part connects the top of the first magnetic post 113 and the top of the second magnetic post 114, and the right part connects the top of the second magnetic post 114 and the top of the second side post 116.

[0107] Similarly, the second magnetic yoke 112 comprises three parts fixed together, so as to... Figure 10 Taking the orientation shown as an example, the left part connects the bottom of the first side post 115 and the bottom of the first magnetic post 113, the middle part connects the bottom of the first magnetic post 113 and the bottom of the second magnetic post 114, and the right part connects the bottom of the second magnetic post 114 and the bottom of the second side post 116.

[0108] The first magnetic yoke 111 and the second magnetic yoke 112 are divided into three parts. Appropriate magnetic materials can be selected according to the type of magnetic flux that needs to pass through the three parts of each magnetic yoke, or targeted materials can be selected according to the type of magnetic flux to improve the decoupling effect.

[0109] Of course, the above two connection methods are only two of the connection methods of the corresponding side post and the corresponding magnetic post in this application. In other implementation methods, one end of the first side post 115 can be directly connected to the first magnetic post 113, and the other end of the first side post 115 can be indirectly connected to the first magnetic post 113. The same applies to the second side post 116 and the second magnetic post 114.

[0110] In this application, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112 is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115, and is also less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116.

[0111] The annular magnetic circuit formed by the first magnetic pillar 113, the first magnetic yoke 111, the second magnetic pillar 114, and the second magnetic yoke 112 refers to the magnetic circuit that is closed after passing through the first magnetic pillar 113, the first magnetic yoke 111, the second magnetic pillar 114, and the second magnetic yoke 112.

[0112] The annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 refers to the closed magnetic circuit after passing through the first magnetic post 113 and the first side post 115. Similarly, the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 refers to the closed magnetic circuit after passing through the second magnetic post 114 and the second side post 116. For example... Figure 9 As shown, if the first magnetic post 113 and the first side post 115 are directly connected, the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 is a closed magnetic circuit that only passes through the first magnetic post 113 and the first side post 115; as Figure 10 As shown, if one end of the first magnetic post 113 is connected to one end of the first side post 115 via the first magnetic yoke 111, and the other end of the first magnetic post 113 is connected to the other end of the first side post 115 via the second magnetic yoke 112, then the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 is a closed magnetic circuit after passing through the first magnetic post 113, part of the first magnetic yoke 111, the first side post 115, and part of the second magnetic yoke 112. The annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 is similar, and will not be described again here.

[0113] In this application, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116, and the second magnetic yoke 112; the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 is less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115, and the second magnetic yoke 112.

[0114] The annular magnetic circuit formed by the first magnetic pillar 113, the first magnetic yoke 111, the second side pillar 116, and the second magnetic yoke 112 refers to the magnetic circuit that is closed after passing through the first magnetic pillar 113, the first magnetic yoke 111, the second side pillar 116, and the second magnetic yoke 112. The annular magnetic circuit formed by the second magnetic pillar 114, the first magnetic yoke 111, the first side pillar 115, and the second magnetic yoke 112 refers to the magnetic circuit that is closed after passing through the second magnetic pillar 114, the first magnetic yoke 111, the first side pillar 115, and the second magnetic yoke 112.

[0115] like Figure 9As shown, if the first magnetic post 113 and the first side post 115 are directly connected, and the second magnetic post 114 and the second side post 116 are directly connected, then the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116 and the second magnetic yoke 112 is a magnetic circuit that is closed by passing through the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, the second side post 116, the second magnetic post 114, and the second magnetic yoke 112; the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115 and the second magnetic yoke 112 is a magnetic circuit that is closed by passing through the second magnetic post 114, the first magnetic yoke 111, the first magnetic post 113, the first side post 115, the first magnetic post 113, and the second magnetic yoke 112.

[0116] like Figure 10 As shown, if the two ends of the first side post 115 are indirectly connected to the two ends of the first magnetic post 113, and the two ends of the second side post 116 are indirectly connected to the two ends of the second magnetic post 114, then the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116, and the second magnetic yoke 112 is a magnetic circuit that is closed only after passing through the first magnetic post 113, the first magnetic yoke 111, the second side post 116, and the second magnetic yoke 112; the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115, and the second magnetic yoke 112 is a magnetic circuit that is closed only after passing through the second magnetic post 114, the first magnetic yoke 111, the first side post 115, and the second magnetic yoke 112.

[0117] Figure 12 for Figure 10 The flux distribution diagram of integrated inductor 10 when coupled in the same direction at the same terminals is shown in the figure below. Figure 12 As shown, Figure 12 Both the right side of the first magnetic post 113 and the left side of the second magnetic post 114 are marked with an "×", indicating that the right-side terminal of the first magnetic post 113 and the left-side terminal of the second magnetic post 114 are the same terminal. Both the left side of the first magnetic post 113 and the right side of the second magnetic post 114 are marked with a "•", indicating that the left-side terminal of the first magnetic post 113 and the right-side terminal of the second magnetic post 114 are the same terminal. Figure 12 The dashed lines with arrows represent common-mode magnetic flux paths, and the solid lines with arrows represent differential-mode magnetic flux paths. For ease of understanding, the dashed and solid lines with arrows in other magnetic flux distribution diagrams in this application have the same meaning.

[0118] When the first winding 12 and the second winding 13 of the integrated inductor 10 are coupled in the same direction using the same-name terminals, refer to Figure 12It can be seen that when current is applied to the integrated inductor 10, the current flowing through the two windings (i.e., the first winding 12 and the second winding 13) generates a magnetic field around each winding according to the right-hand screw rule. Specifically, when differential-mode current is applied to the integrated inductor 10, the current flows into one winding from the same-name terminal and out of the other winding from the same-name terminal. Since, according to the right-hand screw rule, the direction of the differential-mode magnetic flux through the first magnetic post 113 is the same as the direction of the differential-mode magnetic flux through the second magnetic post 114 (taking the winding methods of the first winding 12 and the second winding 13 as opposite as an example, in this case...) Figure 12 As shown, the differential-mode magnetic flux directions passing through the first magnetic post 113 and the second magnetic post 114 are both upward. Furthermore, in this application, since the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116, and the second magnetic yoke 112, the differential-mode magnetic flux passing through the first magnetic post 113 will form a closed annular magnetic circuit through the first side post 115. Similarly, since the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 is less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115, and the second magnetic yoke 112, the differential-mode magnetic flux passing through the second magnetic post 114 can form a closed annular magnetic circuit through the second side post 116.

[0119] If a common-mode current is applied to the integrated inductor 10, the magnetic flux direction through the first magnetic post 113 is opposite to the magnetic flux direction through the second magnetic post 114 according to the right-hand screw rule (e.g., ...). Figure 12 As shown, the common-mode magnetic flux passing through the first magnetic post 113 is directed upwards, and the common-mode magnetic flux passing through the second magnetic post 114 is directed downwards. Furthermore, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112 is less than that of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115, and also less than that of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116. Therefore, the common-mode magnetic flux generated at the first magnetic post 113 and the second magnetic post 114 both pass through the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112 to form a closed annular magnetic circuit.

[0120] Figure 13 for Figure 10 The flux distribution diagram of integrated inductor 10 when reverse coupling occurs at the same-name terminals is shown below. Figure 13 As shown, Figure 13The right side of the first magnetic post 113 and the right side of the second magnetic post 114 are both marked with "×", meaning that the right-side terminals of the first magnetic post 113 and the second magnetic post 114 are the same type of terminal. The left side of the first magnetic post 113 and the left side of the second magnetic post 114 are both marked with "•", meaning that the left-side terminals of the first magnetic post 113 and the second magnetic post 114 are the same type of terminal.

[0121] When the first winding 12 and the second winding 13 of the integrated inductor 10 are coupled in a reverse coupling manner with the same-name terminals, if a differential-mode current is applied to the integrated inductor 10, due to the right-hand screw rule, the direction of the differential-mode magnetic flux through the first magnetic post 113 is opposite to the direction of the differential-mode magnetic flux through the second magnetic post 114 (e.g., Figure 13 As shown, the differential-mode magnetic flux passing through the first magnetic post 113 is directed upwards, and the differential-mode magnetic flux passing through the second magnetic post 114 is directed downwards. Furthermore, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112 is less than that of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115, and also less than that of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116. Therefore, the differential-mode magnetic flux generated by the first magnetic post 113 and the second magnetic post 114 both pass through the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112 to form a closed annular magnetic circuit.

[0122] If a common-mode current is applied to the integrated inductor 10, since the direction of the common-mode magnetic flux through the first magnetic post 113 is the same as the direction of the common-mode magnetic flux through the second magnetic post 114 according to the right-hand screw rule (e.g., ... Figure 13 As shown, the common-mode magnetic flux directions through the first magnetic post 113 and the second magnetic post 114 are both upward. Furthermore, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116, and the second magnetic yoke 112. Therefore, the common-mode magnetic flux generated through the first magnetic post 113 can form a closed annular magnetic circuit through the first side post 115. Since the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 is less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115, and the second magnetic yoke 112, the common-mode magnetic flux generated through the second magnetic post 114 can form a closed annular magnetic circuit through the second side post 116.

[0123] Based on the above analysis, it can be seen that, using the integrated inductor 10 provided in this application, regardless of whether the same-name terminals are coupled in the same direction or in opposite directions, in the integrated inductor 10 provided in this application, one of the common-mode magnetic flux path and the differential-mode magnetic flux path forms a closed loop magnetic circuit through the first magnetic pillar 113, the first magnetic yoke 111, the second magnetic pillar 114, and the second magnetic yoke 112; the other forms a closed loop magnetic circuit through the corresponding magnetic pillar and the corresponding side pillar (i.e., the first magnetic pillar 113 and the first side pillar 115 form a closed loop magnetic circuit, and the second magnetic pillar 114 and the second side pillar 116 form a closed loop magnetic circuit). (Refer to...) Figure 12 and Figure 13 It can be seen that the differential-mode flux path and the common-mode flux path can be basically decoupled. For example, changes in the parameters of the first side post 115 and the second side post 116 only affect one type of magnetic circuit without affecting the other. Similarly, changes in the spacing between the first magnetic post 113 and the second magnetic post 114 only affect one type of magnetic circuit without affecting the other. That is, using the integrated inductor 10 provided in this application can improve the problem of high coupling between the differential-mode flux path and the common-mode flux path in some solutions, which is beneficial for the independent optimization of differential-mode inductance and common-mode inductance, and improves the design flexibility of differential-mode inductance and common-mode inductance.

[0124] The magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar 113, the first magnetic yoke 111, the second magnetic pillar 114, and the second magnetic yoke 112 is less than that of the annular magnetic circuit formed by the first magnetic pillar 113 and the first side pillar 115. The magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar 114 and the second side pillar 116 can be achieved in different ways. For example, the material of the corresponding components on the magnetic circuit can be changed to increase or decrease the permeability, the length of the corresponding magnetic circuit can be changed, or the cross-sectional area of ​​the corresponding magnetic circuit can be changed.

[0125] For example, in one implementation, both the first yoke 111 and the second yoke 112 are made of high permeability materials, while both the first side pillar 115 and the second side pillar 116 are made of low permeability materials. Using high permeability materials for the first yoke 111 and the second yoke 112 can help reduce the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar 113, the first yoke 111, the second magnetic pillar 114, and the second yoke 112.

[0126] Low permeability materials refer to materials with a permeability of 200 μ. r The following materials; high permeability materials refer to materials with a permeability of 1000 μ. r The above materials.

[0127] Furthermore, in this application, the first magnetic yoke 111 and the second magnetic yoke 112 are both made of high permeability materials, and the first side pillar 115 and the second side pillar 116 are both made of low permeability materials. This means that, in the same scenario, the materials of the first magnetic yoke 111 and the second magnetic yoke 112 are both high permeability materials, while the materials of the first side pillar 115 and the second side pillar 116 are both low permeability materials. For example, when the magnetic core 11 is in a high current scenario, the first magnetic yoke 111 and the second magnetic yoke 112 maintain high permeability, while the first side pillar 115 and the second side pillar 116 maintain low permeability. Similarly, when the magnetic core 11 is in a low current scenario, the first magnetic yoke 111 and the second magnetic yoke 112 maintain high permeability, while the first side pillar 115 and the second side pillar 116 maintain low permeability.

[0128] In another implementation, the magnetic path length of the annular magnetic circuit formed by the first magnetic pillar 113, the first magnetic yoke 111, the second magnetic pillar 114, and the second magnetic yoke 112 is less than the magnetic reluctance length of the annular magnetic circuit formed by the first magnetic pillar 113 and the first side pillar 115, and also less than the magnetic path length of the annular magnetic circuit formed by the second magnetic pillar 114 and the second side pillar 116. Shortening the magnetic path length of the annular magnetic circuit formed by the first magnetic pillar 113, the first magnetic yoke 111, the second magnetic pillar 114, and the second magnetic yoke 112 can help reduce the magnetic reluctance of the annular magnetic circuit formed by these components.

[0129] Similarly, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar 113 and the first side pillar 115 is less than that of the annular magnetic circuit formed by the first magnetic pillar 113, the first magnetic yoke 111, the second side pillar 116, and the second magnetic yoke 112. The magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar 114 and the second side pillar 116 being less than that of the annular magnetic circuit formed by the second magnetic pillar 114, the first magnetic yoke 111, the first side pillar 115, and the second magnetic yoke 112 can also be achieved in different ways. For example, the material of the corresponding components on the magnetic circuit can be changed to increase or decrease the permeability, the length of the corresponding magnetic circuit can be changed, or the cross-sectional area of ​​the corresponding magnetic circuit can be changed.

[0130] For example, the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 can be made smaller than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116 and the second magnetic yoke 112 by making the magnetic circuit length of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 smaller than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116 and the second magnetic yoke 112.

[0131] By making the length of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 less than the length of the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115 and the second magnetic yoke 112, the magnetic resistance of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 is less than the magnetic resistance of the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115 and the second magnetic yoke 112.

[0132] By changing the length of the magnetic circuit as described above, this application enables the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113 and the first side post 115 to be less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic post 113, the first magnetic yoke 111, the second side post 116 and the second magnetic yoke 112, and the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114 and the second side post 116 to be less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic post 114, the first magnetic yoke 111, the first side post 115 and the second magnetic yoke 112.

[0133] Because differential mode current is characterized by high-frequency current ripple with large peak-to-peak values ​​and large flux density variations, low-loss magnetic materials must be selected for the magnetic materials along the differential mode flux path. Therefore, in the magnetic core 11 of the integrated inductor 10 of this application, the corresponding magnetic circuits that require differential mode flux passage need to be made of low-loss magnetic materials to meet the requirements of differential mode flux.

[0134] For example, when the first side post 115 and the second side post 116 are connected by differential mode magnetic flux, the magnetic materials of the first side post 115 and the second side post 116 are respectively made of ferrite, iron-nickel-molybdenum and iron-silicon-aluminum or similar materials.

[0135] Among all soft magnetic materials, ferrites (such as manganese zinc ferrites) have the lowest high-frequency loss and are cost-effective, making them the first choice for achieving high efficiency in differential mode magnetic circuits.

[0136] Iron-nickel-molybdenum (FeNiMo) has the lowest high-frequency loss among metal powder cores, and better temperature rise control under differential mode conditions. Moreover, FeNiMo has a distributed air gap, no edge flux problem, and its permeability changes very little with frequency and temperature. It is suitable for applications with high requirements for loss and stability, and where it is desirable to avoid the edge effect of concentrated air gap in ferrite.

[0137] The high-frequency loss of iron-silicon-aluminum alloy is between that of ferrite and iron powder core, which is better than that of ordinary iron powder core. It also has a distributed air gap and good temperature stability, making it cost-effective and suitable for differential mode magnetic circuit design with cost sensitivity and moderate frequency.

[0138] Ferrite, iron-nickel-molybdenum and iron-silicon-aluminum analogous materials refer to materials that have similar properties to ferrite, iron-nickel-molybdenum and iron-silicon-aluminum respectively.

[0139] Because common-mode current is characterized by large amplitude and high flux density at low frequencies, the magnetic materials along the common-mode flux path must be selected based on their resistance to saturation bias. Therefore, in the integrated inductor 10 of this application, the corresponding magnetic circuits in the core 11 that require the passage of common-mode flux must be selected using magnetic materials with good resistance to saturation bias to meet the requirements of the common-mode flux.

[0140] For example, when the first side post 115 and the second side post 116 are connected by a common-mode magnetic flux, the magnetic materials of the first side post 115 and the second side post 116 are respectively made of iron-nickel alloy, iron-silicon-aluminum and iron-based amorphous materials or similar materials.

[0141] Among them, iron-nickel alloy has high saturation magnetic flux density and the strongest DC bias resistance among all magnetic powder cores. It can withstand extremely high low-frequency current amplitudes without saturation. At the same time, it has very small magnetostriction and quiet operation, making it the best choice for common-mode dedicated magnetic circuits to cope with harsh bias conditions.

[0142] Ferrosilicon-aluminum alloys have high saturation magnetic flux density and natural anti-bias capability due to distributed air gaps. They offer high cost-effectiveness and can provide reliable anti-saturation performance under conditions of moderate common-mode current amplitude and non-extreme bias.

[0143] Iron-based amorphous materials have high saturation magnetic flux density, low-frequency losses are much lower than those of traditional silicon steel sheets, and excellent anti-saturation capabilities, making them suitable for common-mode magnetic circuits with low-frequency high current, high magnetic flux density, and certain requirements for loss.

[0144] Similar materials to iron-nickel alloys and iron-based amorphous materials refer to materials that have similar properties to iron-nickel alloys and iron-based amorphous materials, respectively.

[0145] Since both the differential-mode flux path and the common-mode flux path need to pass through the first magnetic post 113 and the second magnetic post 114, and when the first side post 115 and the first magnetic post 113 are indirectly connected through the first magnetic yoke 111 and the second magnetic yoke 112, and the second side post 116 and the second magnetic yoke 112 are indirectly connected through the first magnetic yoke 111 and the second magnetic yoke 112, some areas of the first magnetic yoke 111 and the second magnetic yoke 112 will pass through the differential-mode flux while other areas will pass through the common-mode flux. This means that the first magnetic yoke 111, the second magnetic yoke 112, the first magnetic post 113 and the second magnetic post 114 may need to simultaneously carry both differential-mode flux and common-mode flux. Therefore, the selection of magnetic materials for the first magnetic yoke 111, the second magnetic yoke 112, the first magnetic post 113 and the second magnetic post 114 needs to take into account the requirements of high-frequency, high-ripple differential-mode flux and low-frequency, high-current common-mode flux, and needs to achieve a balance between high-frequency, low-loss and strong anti-saturation bias capability.

[0146] For the reasons mentioned above, in one implementation, the magnetic materials of the first magnetic yoke 111, the second magnetic yoke 112, the first magnetic post 113, and the second magnetic post 114 are respectively made of iron-silicon-aluminum and iron-nickel-molybdenum or similar materials.

[0147] Among them, iron-silicon-aluminum has the most balanced comprehensive performance. Its distributed air gap structure gives it excellent DC bias resistance and can withstand common-mode low-frequency large current. At the same time, its high-frequency loss is significantly lower than that of iron powder core, which can meet the low magnetic loss requirements of differential-mode high-frequency large ripple. In addition, it has small magnetostriction and low noise, making it the most universal choice for common magnetic circuits.

[0148] Iron-nickel-molybdenum (FeNiMo) exhibits the lowest high-frequency loss among metal powder cores, and its temperature rise control under differential mode conditions is superior to that of iron-silicon-aluminum (FeSiA). Furthermore, FeNiMo possesses excellent anti-saturation capabilities. When the system has extremely stringent requirements for differential mode loss and the common-mode bias magnetic field strength is moderate, FeNiMo can achieve even better efficiency performance.

[0149] Of course, if the first side post 115 and the first magnetic post 113 are directly connected, and the second side post 116 and the second magnetic yoke 112 are directly connected, since the first magnetic yoke 111 and the second magnetic yoke 112 only pass through one of the common-mode magnetic flux and the differential-mode magnetic flux, the magnetic materials of the first magnetic post 113 and the second magnetic post 114 can both be made of either iron-silicon-aluminum or iron-nickel-molybdenum, and the first magnetic yoke 111 and the second magnetic yoke 112 can be made of appropriate materials according to the type of magnetic flux that needs to pass through.

[0150] In this application, when the two ends of the first side post 115 are directly connected to the two ends of the first magnetic post 113, for example, the two ends of the first side post 115 and the two ends of the first magnetic post 113 are directly connected; when the two ends of the first side post 115 are indirectly connected to the two ends of the first magnetic post 113, for example, when one end of the first side post 115 is connected to one end of the first magnetic post 113 through the first magnetic yoke 111, and the other end of the first side post 115 is connected to the other end of the first magnetic post 113 through the second magnetic yoke 112, for example, one end of the first side post 115 is connected to one end of the first magnetic yoke 111, and the other end of the first side post 115 is connected to one end of the second magnetic yoke 112.

[0151] Similarly, when one end of the second side post 116 is connected to one end of the second magnetic post 114 through the first magnetic yoke 111, and the other end of the second side post 116 is connected to the other end of the second magnetic post 114 through the second magnetic yoke 112, for example, one end of the second side post 116 is connected to the other end of the first magnetic yoke 111, and the other end of the second side post 116 is connected to the other end of the second magnetic yoke 112.

[0152] That is, if the corresponding side post is directly connected to the two magnetic yokes, the connection position between the corresponding side post and the two magnetic yokes is located at the ends of the two magnetic yokes.

[0153] In this application, the first side post 115 may include only one post (which may be straight, L-shaped, or U-shaped), or it may include multiple posts (or multiple parts, each part having one post), and the second side post 116 is similar. The structure and location of the first side post 115 and the second side post 116 in this application will be described below.

[0154] In one implementation, continue to refer to Figure 10 and Figure 11 As shown, along the second direction X, the first side post 115 is located on the side of the first magnetic post 113 away from the second magnetic post 114, and the second side post 116 is located on the side of the second magnetic post 114 away from the first magnetic post 113.

[0155] When the first side post 115 is located on the side of the first magnetic post 113 away from the second magnetic post 114 and the second side post 116 is located on the side of the second magnetic post 114 away from the first magnetic post 113, then... Figure 10 and Figure 11 Taking orientation as an example, the first side post 115 is located on the left side of the two magnetic posts, and the second side post 116 is located on the right side of the two magnetic posts. The two magnetic posts and two side posts of the magnetic core 11 are arranged along the second direction X, which can reduce the size of the magnetic core 11 along the third direction Y (i.e., the direction perpendicular to the first direction Z and the second direction X respectively), so that the integrated inductor 10 can be used in a narrow and long inductor shell or in a narrow and long space, which can meet the installation requirements in some special scenarios.

[0156] The integrated inductor 10 provided in this application can be, for example, Figure 10 and Figure 11 The single-phase integration shown can be either a single-phase integration (i.e., integrating the two inductors of a single-phase switch arm together) or a multi-phase integration (integrating the multiple inductors of a multi-phase switch arm together).

[0157] Figure 14 for Figure 10 A schematic diagram of the structure of a multi-phase integrated inductor. Figure 15 for Figure 14 The main view of the structure, when the first side post 115 is located on the side of the first magnetic post 113 away from the second magnetic post 114 and the second side post 116 is located on the side of the second magnetic post 114 away from the first magnetic post 113, as shown... Figure 14 and Figure 15As shown, when the integrated inductor 10 of this application needs to be expanded into multiple phases, such as integrating a three-phase switch arm inductor or a two-phase integrated inductor 10, for example, the number of magnetic cores 11 is multiple, and the multiple magnetic cores 11 are arranged sequentially along the second direction X. The second side post 116 of one of the two adjacent magnetic cores 11 is connected to the first side post 115 of the other of the two adjacent magnetic cores 11. The outer periphery of the first magnetic post 113 in each magnetic core 11 is wound with a first winding 12, and the outer periphery of the second magnetic post 114 in each magnetic core 11 is wound with a second winding 13.

[0158] To save materials or reduce the overall dimensions of the integrated inductor 10 along the second direction X, for example, the second side post 116 of one of the two adjacent magnetic cores 11 and the first side post 115 of the other of the two adjacent magnetic cores 11 are integral structural components, such as... Figure 14 and Figure 15 As shown, the second side post 116 of one of the two adjacent magnetic cores 11 and the first side post 115 of the other magnetic core 11 share a structure. By making the side posts of two adjacent magnetic cores 11 share a structure, this application can reduce the size and volume, as well as the amount of magnetic material used, thereby reducing costs.

[0159] When the integrated inductor 10 is expanded into a multiphase integrated inductor, the common-mode inductance and differential-mode inductance generated by the two windings of each phase switch bridge arm can be basically decoupled. Compared with the three-column integrated inductor in some schemes (the single-phase integrated inductor has the problem of high coupling between the common-mode magnetic flux path and the differential-mode magnetic flux path, and cannot solve the saturation risk and design decoupling problem caused by interphase magnetic coupling after multiphase integration), the magnetic circuit of the multiphase integrated inductor structure of this application is simpler and easier to expand into a multiphase inductor.

[0160] Figure 16 This is the third schematic diagram of the integrated inductor 10 provided in the embodiments of this application. In one implementation, such as... Figure 16 As shown, the first side post 115 and the first magnetic post 113 are arranged along the third direction Y, and the second side post 116 and the second magnetic post 114 are arranged along the third direction Y. The third direction Y, the first direction Z and the second direction X are perpendicular to each other.

[0161] When the first side post 115 and the first magnetic post 113 are arranged along the third direction Y, and the second side post 116 and the second magnetic post 114 are arranged along the third direction Y, as follows: Figure 16 As shown, the first side post 115 is located on the front or rear side of the two magnetic posts. Figure 16 Taking the front side as an example), the second side post 116 is located in front of or behind the two magnetic posts. Figure 16Taking the front side as an example, the two magnetic pillars of the magnetic core 11 are arranged along the second direction X, and the corresponding magnetic pillars and corresponding side pillars are arranged along the third direction Y. This arrangement avoids the overall structure of the integrated inductor 10 from being too large in one direction, thus achieving a relatively balanced size in all directions. The integrated inductor 10 of this application, with this structural layout, can meet the layout requirements in some relatively square and regular spaces, satisfying the installation needs of most common scenarios.

[0162] Specifically, when the first side post 115 and the first magnetic post 113 are arranged along the third direction Y, and the second side post 116 and the second magnetic post 114 are arranged along the third direction Y, Figure 17 for Figure 16 Common-mode flux distribution diagram of integrated inductor 10 when coupled in the same direction at the same terminals. Figure 18 for Figure 16 The differential-mode flux distribution diagram of integrated inductor 10 when the two windings of integrated inductor 10 are coupled in the same direction at the same terminals. When the two windings of integrated inductor 10 are coupled in the same direction at the same terminals, as shown... Figure 17 As shown, when a common-mode current is applied to both windings, according to the right-hand screw rule, the direction of the magnetic flux through the first magnetic post 113 is opposite to the direction of the magnetic flux through the second magnetic post 114. The common-mode magnetic flux generated at the first magnetic post 113 and the second magnetic post 114 both form a closed loop magnetic circuit through the first magnetic post 113, the first yoke 111, the second magnetic post 114, and the second yoke 112; Figure 18 As shown, when differential mode current is applied to both windings, according to the right-hand screw rule, the direction of the differential mode magnetic flux through the first magnetic post 113 is the same as the direction of the differential mode magnetic flux through the second magnetic post 114 (e.g., ...). Figure 18 As shown, the differential-mode magnetic flux directions through the first magnetic post 113 and the second magnetic post 114 both point upwards. Since the differential-mode magnetic flux path through the second magnetic post 114 is the same as that through the first magnetic post 113, to avoid redundancy, this application uses only the first magnetic post 113 as an example. Figure 18 (The second magnetic post 114, the second winding 13, and the second side post 116, as well as the corresponding magnetic circuit paths, are not shown in the diagram.) The differential-mode magnetic flux passing through the first magnetic post 113 will form a closed loop magnetic circuit through the first side post 115. Similarly, the differential-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through the second side post 116.

[0163] It can be seen that when the first side post 115 and the first magnetic post 113 are arranged along the third direction Y, and the second side post 116 and the second magnetic post 114 are also arranged along the third direction Y, the basic decoupling of differential-mode and common-mode magnetic flux paths can still be achieved, similar to the situation where the first side post 115 is located on the side of the first magnetic post 113 away from the second magnetic post 114, and the second side post 116 is located on the side of the second magnetic post 114 away from the first magnetic post 113. The two structures have different layout positions but similar principles.

[0164] Figure 19 for Figure 16 Differential-mode flux distribution diagram of integrated inductor 10 when reverse coupling occurs at the same-name terminals. Figure 20 for Figure 16 The common-mode flux distribution diagram of integrated inductor 10 when reverse-coupled at the same-name terminals. When differential-mode current is applied to the two windings, as shown... Figure 19 As shown, the differential-mode magnetic flux generated at the first magnetic post 113 and the second magnetic post 114 both form a closed loop magnetic circuit through the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112; when a common-mode current is applied to the two windings, as... Figure 20 As shown, the common-mode magnetic flux passing through the first magnetic post 113 will form a closed loop magnetic circuit through the first side post 115. Similarly, the common-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through the second side post 116. Figure 20 The second magnetic post 114 and the second side post 116 are not shown.

[0165] That is, regardless of whether the same-named ends are coupled in the same direction or in opposite directions, when the first side post 115 and the first magnetic post 113 are arranged along the third direction Y and the second side post 116 and the second magnetic post 114 are arranged along the third direction Y, the basic decoupling of the differential mode magnetic flux path and the common mode magnetic flux path can still be achieved.

[0166] In one implementation, such as Figure 16 As shown, along the third direction Y, the first side post 115 and the second side post 116 are located on the same side of the first magnetic yoke 111.

[0167] When the first side post 115 and the second side post 116 are located on the same side of the first magnetic yoke 111, on the one hand, the size of the magnetic core 11 along the third direction Y can be shortened; on the other hand, when the integrated inductor 10 includes two magnetic cores 11 for two-phase integration, the two magnetic cores 11 can share the first side post 115 and the second side post 116 (for example, the first side post 115 and the second side post 116 are located between the two magnetic yokes of one magnetic core 11 and the two magnetic yokes of the other magnetic core 11), and the first side post 115 and the second side post 116 can be fully utilized to maximize material utilization.

[0168] Of course, the first side post 115 and the second side post 116 being located on the same side of the first magnetic yoke 111 is only one example of this application. In some embodiments, the first side post 115 and the second side post 116 may also be located on opposite sides of the first magnetic yoke 111.

[0169] When the first side post 115 and the first magnetic post 113 are arranged along the third direction Y, and the second side post 116 and the second magnetic post 114 are arranged along the third direction Y, the integrated inductor 10 provided in this application can be as follows: Figure 16The single-phase integration shown can be either a single-phase integration (i.e., integrating the two inductors of a single-phase switch arm together) or a multi-phase integration (integrating the multiple inductors of a multi-phase switch arm together).

[0170] Wherein, when the first side post 115 and the first magnetic post 113 are arranged along the third direction Y, and the second side post 116 and the second magnetic post 114 are arranged along the third direction Y, if the integrated inductor 10 is a multiphase integrated inductor Figure 21 for Figure 16 A schematic diagram of the structure of a multi-phase integrated inductor, for example, as shown below. Figure 21 As shown, there are multiple magnetic cores 11, which are arranged sequentially along the third direction Y. The multiple magnetic cores 11 include adjacent first magnetic cores 11A and second magnetic cores 11B. The first side post 115 in the first magnetic core 11A and the first side post 115 in the second magnetic core 11B are arranged facing each other and connected. The second side post 116 in the first magnetic core 11A and the second side post 116 in the second magnetic core 11B are arranged facing each other and connected. A first winding 12 is wound around the outer periphery of the first magnetic post 113 in each magnetic core 11, and a second winding 13 is wound around the outer periphery of the second magnetic post 114 in each magnetic core 11.

[0171] That is, when the multiple magnetic cores 11 include adjacent first magnetic core 11A and second magnetic core 11B, the first side posts 115 of the first magnetic core 11A and the second magnetic core 11B are arranged and connected in opposite directions along the third direction Y, and the second side posts 116 of the first magnetic core 11A and the second magnetic core 11B are arranged and connected in opposite directions along the third direction Y.

[0172] To save materials or reduce the overall dimensions of the integrated inductor 10 along the third direction Y, for example, the first side post 115 in the first magnetic core 11A and the first side post 115 in the second magnetic core 11B are integral structural components, and the second side post 116 in the first magnetic core 11A and the second side post 116 in the second magnetic core 11B are integral structural components, such as... Figure 21 As shown, in adjacent first magnetic cores 11A and second magnetic cores 11B, the first side post 115 is shared and the second side post 116 is shared. By making the side posts shared between two adjacent magnetic cores, this application can reduce size and volume, and also reduce the amount of magnetic material used to reduce costs.

[0173] When the multiple magnetic cores 11 also include a third magnetic core 11C, that is, when the multiple magnetic cores 11 are three-phase integrated, in this application, reference continues to be made to... Figure 21The second magnetic core 11B includes two first side posts 115, which are located on opposite sides of the first magnetic post 113 along the third direction Y. The first side posts 115 in the second magnetic core 11B that are closer to the first magnetic core 11A are arranged facing each other and are an integral structural component. The second magnetic core 11B also includes two second side posts 116, which are located on opposite sides of the second magnetic post 114 along the third direction Y. The second side posts 116 in the second magnetic core 11B that are closer to the first magnetic core 11A are arranged facing each other and are an integral structural component.

[0174] Along the third direction Y, the third magnetic core 11C is located on the side of the second magnetic core 11B away from the first magnetic core 11A. The first side post 115 in the third magnetic core 11C and the first side post 115 in the second magnetic core 11B away from the first magnetic core 11A are arranged facing each other and are an integral structural component. The second side post 116 in the third magnetic core 11C and the second side post 116 in the second magnetic core 11B away from the first magnetic core 11A are arranged facing each other and are an integral structural component.

[0175] When the second magnetic core 11B includes two first side posts 115 and two second side posts 116, the two first side posts 115 of the second magnetic core 11B can be connected to the first side posts 115 of the first magnetic core 11A and the first side posts 115 of the third magnetic core 11C, respectively. Similarly, the two second side posts 116 of the second magnetic core 11B can be connected to the second side posts 116 of the first magnetic core 11A and the second side posts 116 of the third magnetic core 11C, respectively. By including two first side posts 115 and two second side posts 116 in the second magnetic core 11B, it is advantageous to add a third magnetic core 11C on the side of the second magnetic core 11B away from the first magnetic core 11A, thereby expanding by one phase and achieving three-phase integration.

[0176] In this application, in addition to the second magnetic core 11B located in the middle during three-phase expansion including two first side posts 115 and two second side posts 116, each magnetic core 11 may also be provided with two first side posts 115 and two second side posts 116.

[0177] For example, Figure 22 This is the fourth schematic diagram of the integrated inductor 10 provided in the embodiments of this application, as shown below. Figure 22 As shown, there are two first side posts 115, which are located on opposite sides of the first magnetic post 113 along the third direction Y; there are two second side posts 116, which are located on opposite sides of the second magnetic post 114 along the third direction Y.

[0178] In this application, if each magnetic core 11 includes two first side posts 115 distributed along the third direction Y and two second side posts 116 distributed along the third direction Y, then if the integrated inductor 10 adopts multi-phase integration, the multi-phase integrated inductor 10 includes multiple magnetic cores 11, the multiple magnetic cores 11 are distributed sequentially along the third direction Y, one first side post 115 of one magnetic core 11 and one first side post 115 of another magnetic core 11 are connected or shared, and one second side post 116 of one magnetic core 11 and one second side post 116 of another magnetic core 11 are connected or shared.

[0179] Figure 23 The fifth schematic diagram of the integrated inductor provided in the embodiments of this application. Figure 24 for Figure 23 Front view of integrated inductor Figure 25 for Figure 23 The right view of the integrated inductor, in one implementation, combined with Figures 23 to 25 As shown, the first side post 115 includes a first part 1151 and a second part 1152. The first part 1151 and the second part 1152 are both connected to the two ends of the first magnetic post 113. The first part 1151 is located on the side of the first magnetic post 113 away from the second magnetic post 114. The second part 1152 and the first magnetic post 113 are arranged along the third direction Y.

[0180] The second side post 116 includes a third part 1161 and a fourth part 1162. Both the third part 1161 and the fourth part 1162 are connected to the two ends of the second magnetic post 114. The third part 1161 is located on the side of the second magnetic post 114 away from the first magnetic post 113. The fourth part 1162 and the second magnetic post 114 are arranged along the third direction.

[0181] The first side post 115 is configured with a first part 1151 and a second part 1152, and the second side post 116 is configured with a third part 1161 and a fourth part 1162. The first side post 115 can reduce the risk of magnetic material saturation by having the first part 1151 and the second part 1152 jointly bear the magnetic flux passing through it. Similarly, the second side post 116 can reduce the risk of magnetic material saturation by having the third part 1161 and the fourth part 1162 jointly bear the magnetic flux passing through it.

[0182] For example, along the third direction Y, the second part 1152 and the fourth part 1162 can be located on the same side of the first magnetic yoke 111 or on opposite sides.

[0183] Among them, such as Figure 23As shown, when the second part 1152 and the fourth part 1162 are located on the same side of the first magnetic yoke 111, the size of the magnetic core 11 along the third direction Y can be shortened. When the integrated inductor 10 includes two magnetic cores 11 for two-phase integration, the two magnetic cores 11 can share the second part 1152 and the fourth part 1162, and the second part 1152 and the fourth part 1162 can be fully utilized to maximize material utilization.

[0184] When the first side post 115 includes a first part 1151 and a second part 1152, and the second side post 116 includes a third part 1161 and a fourth part 1162, if the integrated inductor 10 is a multiphase integrated inductor, Figure 26 for Figure 23 A schematic diagram of the structure of a multiphase integrated inductor. Figure 27 for Figure 26 The left view of the middle structure, for example, combined with Figure 26 and Figure 27 As shown, there are multiple magnetic cores 11, which are arranged sequentially along the third direction Y. The multiple magnetic cores 11 include adjacent first magnetic cores 11A and second magnetic cores 11B. The second portion 1152 of the first magnetic core 11A and the second portion 1152 of the second magnetic core 11B are arranged facing each other and connected. The fourth portion 1162 of the first magnetic core 11A and the fourth portion 1162 of the second magnetic core 11B are arranged facing each other and connected. A first winding 12 is wound around the outer periphery of the first magnetic post 113 in each magnetic core 11, and a second winding 13 is wound around the outer periphery of the second magnetic post 114 in each magnetic core 11.

[0185] That is, when the plurality of magnetic cores 11 include adjacent first magnetic core 11A and second magnetic core 11B, the second portions 1152 of the first magnetic core 11A and the second magnetic core 11B are arranged and connected in the same direction Y, and the fourth portions 1162 of the first magnetic core 11A and the second magnetic core 11B are arranged and connected in the same direction Y.

[0186] To save materials, or to reduce the overall dimensions of the integrated inductor 10 along the third direction Y, for example, as Figure 26 or Figure 27 As shown, the second part 1152 in the first magnetic core 11A and the second part 1152 in the second magnetic core 11B are integral structural components, and the fourth part 1162 in the first magnetic core 11A and the fourth part 1162 in the second magnetic core 11B are integral structural components. That is, the second part 1152 and the fourth part 1162 in adjacent first magnetic cores 11A and second magnetic cores 11B are shared.

[0187] When the multiple magnetic cores 11 also include a third magnetic core 11C, that is, when the multiple magnetic cores 11 are three-phase integrated, in this application, reference continues to be made to... Figure 26At this time, the second part 1152 in the second magnetic core 11B includes two parts. Along the third direction Y, the two second parts 1152 are located on opposite sides of the first magnetic post 113. The second part 1152 in the second magnetic core 11B that is close to the first magnetic core 11A is arranged facing the second part 1152 in the first magnetic core 11A and is an integral structural component.

[0188] The second magnetic core 11B includes two fourth parts 1162 along the third direction Y. The two fourth parts 1162 are located on opposite sides of the second magnetic column. The fourth part 1162 in the second magnetic core 11B that is closer to the first magnetic core 11A is arranged facing the fourth part 1162 in the first magnetic core 11A and is an integral structural component.

[0189] Along the third direction Y, the third magnetic core 11C is disposed on the side of the second magnetic core 11B away from the first magnetic core 11A. The second part 1152 of the third magnetic core 11C and the second part 1152 of the second magnetic core 11B away from the first magnetic core 11A are arranged facing each other and are an integral structural component. The fourth part 1162 of the third magnetic core 11C and the fourth part 1162 of the second magnetic core 11B away from the first magnetic core 11A are arranged facing each other and are an integral structural component.

[0190] This application sets up two parts for the second part 1152 and the fourth part 1162 of the second magnetic core 11B. The second part 1152 of the second magnetic core 11B that is away from the first magnetic core 11A and the second part 1152 of the third magnetic core 11C are set up as an integral structure, which can realize the shared structure of the two. The fourth part 1162 of the second magnetic core 11B that is away from the first magnetic core 11A and the fourth part 1162 of the third magnetic core 11C are set up as an integral structure, which can realize the shared structure of the two. It is beneficial to add a third magnetic core 11C on the side of the second magnetic core 11B away from the first magnetic core 11A, so as to expand one more phase and realize three-phase integration.

[0191] Furthermore, in this application, when the first side post 115 includes a first portion 1151 and a second portion 1152, and the second side post 116 includes a third portion 1161 and a fourth portion 1162, the multiple magnetic cores 11 can be arranged sequentially along the third direction Y for multiphase integration, or they can be arranged sequentially along the second direction X for multiphase integration. Figure 26 This is just one integration method in this application.

[0192] Figure 28 This is the sixth schematic diagram of the integrated inductor 10 provided in the embodiments of this application. Figure 29 for Figure 28 Left view of the middle structure, in conjunction with reference Figures 28 to 29As shown, in one implementation, the first side post 115 includes a first portion 1151 and two second portions 1152. Both the first portion 1151 and the two second portions 1152 are connected to both ends of the first magnetic post 113. The first portion 1151 is located on the side of the first magnetic post 113 facing away from the second magnetic post 114. Along the third direction Y, the two second portions 1152 are located on opposite sides of the first magnetic post 113.

[0193] The second side post 116 includes a third part 1161 and two fourth parts 1162. The third part 1161 and the two fourth parts 1162 are both connected to the two ends of the second magnetic post 114. The third part 1161 is located on the side of the second magnetic post 114 opposite to the first magnetic post 113. Along the third direction Y, the two fourth parts 1162 are located on opposite sides of the second magnetic post 114.

[0194] When the first side post 115 includes a first part 1151 and two second parts 1152, and the second side post 116 includes a third part 1161 and two fourth parts 1162... Figure 30 for Figure 28 Common-mode flux distribution diagram of integrated inductor 10 when coupled in the same direction at the same terminals. Figure 31 for Figure 28 The differential mode flux distribution diagram of integrated inductor 10 when the two windings of integrated inductor 10 are coupled in the same direction at the same terminals shows that, as Figure 30 As shown, when a common-mode current is applied to both windings, according to the right-hand screw rule, the direction of the magnetic flux through the first magnetic post 113 is opposite to the direction of the magnetic flux through the second magnetic post 114. The common-mode magnetic flux generated at the first magnetic post 113 and the second magnetic post 114 both form a closed loop magnetic circuit through the first magnetic post 113, the first yoke 111, the second magnetic post 114, and the second yoke 112. Figure 31 As shown, when differential mode current is applied to both windings, according to the right-hand screw rule, the direction of the differential mode magnetic flux through the first magnetic post 113 is the same as the direction of the differential mode magnetic flux through the second magnetic post 114, such as... Figure 31 As shown, the differential-mode magnetic flux directions through the first magnetic post 113 and the second magnetic post 114 both point upwards. Since the differential-mode magnetic flux path through the second magnetic post 114 is the same as that through the first magnetic post 113, to avoid redundancy, this application uses only the first magnetic post 113 as an example. Figure 31The second magnetic post 114, the second winding 13, and the third and fourth portions 1161 and 1162 of the second side post 116, as well as the corresponding magnetic circuit paths, are not shown in the diagram. A portion of the differential-mode flux passing through the first magnetic post 113 forms a closed loop magnetic circuit through a second portion 1152 of the first side post 115. Another portion of the differential-mode flux passing through the first magnetic post 113 forms a closed loop magnetic circuit through another second portion 1152 of the first side post 115. Yet another portion of the differential-mode flux passing through the first magnetic post 113 passes through the first portion 1151 of the first side post 115. Figure 31 (Not shown in the image) to form a closed loop magnetic circuit. Similarly, a portion of the differential-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through a fourth part 1162 of the second side post 116, another portion of the differential-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through another fourth part 1162 of the second side post 116, and yet another portion of the differential-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through a third part 1161 of the second side post 116.

[0195] That is, when the first side post 115 includes a first part 1151 and two second parts 1152, and the second side post 116 includes a third part 1161 and two fourth parts 1162, the basic decoupling of the differential mode magnetic flux and the common mode magnetic flux path can still be achieved.

[0196] Figure 32 for Figure 28 Differential-mode flux distribution diagram of integrated inductor 10 when reverse coupling occurs at the same-name terminals. Figure 33 for Figure 28 The common-mode flux distribution diagram of integrated inductor 10 when the two windings of integrated inductor 10 are reverse-coupled at the same-name terminals. This is shown when the two windings of integrated inductor 10 are reverse-coupled at the same-name terminals. Figure 32 As shown, when differential-mode current is applied to both windings, the differential-mode magnetic flux generated at the first magnetic post 113 and the second magnetic post 114 forms a closed loop magnetic circuit through the first magnetic post 113, the first magnetic yoke 111, the second magnetic post 114, and the second magnetic yoke 112; when common-mode current is applied to both windings, as shown... Figure 33 As shown, a portion of the common-mode magnetic flux passing through the first magnetic post 113 forms a closed loop magnetic circuit through a second portion 1152 of the first side post 115. Another portion of the common-mode magnetic flux passing through the first magnetic post 113 forms a closed loop magnetic circuit through another second portion 1152 of the first side post 115. Yet another portion of the common-mode magnetic flux passing through the first magnetic post 113 forms a closed loop magnetic circuit through a first portion 1151 of the first side post 115. The first portion 1151... Figure 33(Not shown in the diagram). Similarly, a portion of the common-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through a fourth portion 1162 of the second side post 116, another portion of the common-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through another fourth portion 1162 of the second side post 116, and yet another portion of the common-mode magnetic flux passing through the second magnetic post 114 can form a closed loop magnetic circuit through a third portion 1161 of the second side post 116. Figure 33 The third part 1161 and the fourth part 1162 of the second magnetic post 114 and the second side post 116 are not shown.

[0197] When the first side post 115 includes a first part 1151 and two second parts 1152, the multiple parts can jointly bear the magnetic flux passing through the first side post 115, which can reduce the risk of magnetic material saturation; similarly, when the second side post 116 includes a third part 1161 and two fourth parts 1162, the multiple parts can jointly bear the magnetic flux passing through the second side post 116, which can reduce the risk of magnetic material saturation.

[0198] When the first side post 115 includes a first portion 1151 and two second portions 1152, and the second side post 116 includes a third portion 1161 and two fourth portions 1162, the integrated inductor 10 of this application can also be multiphase integrated. Figure 34 for Figure 28 A schematic diagram of the structure of a multi-phase integrated inductor. Figure 35 for Figure 34 The left view of the middle structure, for example, combined Figure 34 and Figure 35 As shown, there are multiple magnetic cores 11, which are arranged sequentially along the third direction Y. The second part 1152 of one magnetic core 11 and the second part 1152 of the other magnetic core 11 in two adjacent magnetic cores 11 are arranged facing each other and are integral structural components. The fourth part 1162 of one magnetic core 11 and the fourth part 1162 of the other magnetic core 11 in two adjacent magnetic cores 11 are also arranged facing each other and are integral structural components. A first winding 12 is wound around the outer periphery of the first magnetic post 113 in each magnetic core 11, and a second winding 13 is wound around the outer periphery of the second magnetic post 114 in each magnetic core 11.

[0199] When the integrated inductor 10 is expanded into a multiphase integrated inductor, the common-mode inductance and differential-mode inductance generated by the two windings of each phase switch arm can be basically decoupled. Therefore, the magnetic circuit of the multiphase integrated inductor structure of this application is relatively simple and easy to expand into a multiphase inductor. In addition, since each side post of the multiphase integrated inductor 10 includes multiple parts, the risk of magnetic saturation can also be reduced.

[0200] In this application, the first side post 115 includes at least one of a first portion 1151 and a second portion 1152, wherein the second portion 1152 may include one or two. The second side post 116 includes at least one of a third portion 1161 and a fourth portion 1162, wherein the fourth portion 1162 may include one or two.

[0201] That is, this application includes a first side post 115 and a second side post 116, wherein the first side post 115 includes at least one of a first portion 1151 and a second portion 1152. When the second portion 1152 is included, the number of second portions 1152 can be one or two. The second side post 116 includes at least one of a third portion 1161 and a fourth portion 1162, and when the fourth portion 1162 is included, the number of fourth portions 1162 can be one or two.

[0202] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated inductor, characterized by Includes a magnetic core, a first winding, and a second winding, wherein: The magnetic core includes a first magnetic yoke, a second magnetic yoke, a first magnetic post, a second magnetic post, a first side post, and a second side post. The first magnetic yoke and the second magnetic yoke are spaced apart along a first direction, and the first magnetic post and the second magnetic post are spaced apart along a second direction. One end of each of the first magnetic post and the second magnetic post is connected to the first magnetic yoke, and the other end of each of the first magnetic post and the second magnetic post is connected to the second magnetic yoke. The first direction is perpendicular to the second direction. The two ends of the first side post are respectively connected to the two ends of the first magnetic post, and the two ends of the second side post are respectively connected to the two ends of the second magnetic post. The magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second magnetic pillar, and the second magnetic yoke is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar and the first side pillar, and is also less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar and the second side pillar; the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar and the first side pillar is less than the magnetic reluctance of the annular magnetic circuit formed by the first magnetic pillar, the first magnetic yoke, the second side pillar, and the second magnetic yoke; the magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar and the second side pillar is less than the magnetic reluctance of the annular magnetic circuit formed by the second magnetic pillar, the first magnetic yoke, the first side pillar, and the second magnetic yoke. The first winding is wound around the outer periphery of the first magnetic post, and the second winding is wound around the outer periphery of the second magnetic post.

2. The integrated inductor according to claim 1, characterized in that, Both the first and second magnetic yokes are made of high permeability materials, while both the first and second side pillars are made of low permeability materials.

3. The integrated inductor according to claim 1 or 2, characterized in that, The magnetic circuit length of the annular magnetic circuit formed by the first magnetic post, the first magnetic yoke, the second magnetic post, and the second magnetic yoke is less than the magnetic reluctance length of the annular magnetic circuit formed by the first magnetic post and the first side post, and is also less than the magnetic circuit length of the annular magnetic circuit formed by the second magnetic post and the second side post.

4. The integrated inductor according to any one of claims 1-3, characterized in that, The length of the annular magnetic circuit formed by the first magnetic post and the first side post is less than the length of the annular magnetic circuit formed by the first magnetic post, the first magnetic yoke, the second side post, and the second magnetic yoke. The length of the annular magnetic circuit formed by the second magnetic post and the second side post is less than the length of the annular magnetic circuit formed by the second magnetic post, the first magnetic yoke, the first side post, and the second magnetic yoke.

5. The integrated inductor according to any one of claims 1-4, characterized in that, The magnetic materials of the first magnetic yoke, the second magnetic yoke, the first magnetic post, and the second magnetic post are each made of either iron-silicon-aluminum or iron-nickel-molybdenum.

6. The integrated inductor according to any one of claims 1-5, characterized in that, When the first side post and the second side post are connected by differential mode magnetic flux, the magnetic materials of the first side post and the second side post are respectively any one of ferrite, iron-nickel-molybdenum and iron-silicon-aluminum; When the first side post and the second side post are connected by a common-mode magnetic flux, the magnetic materials of the first side post and the second side post are any one of iron-nickel alloy, iron-silicon-aluminum and iron-based amorphous materials.

7. The integrated inductor according to any one of claims 1-6, characterized in that, Along the second direction, the first side post is located on the side of the first magnetic post opposite to the second magnetic post, and the second side post is located on the side of the second magnetic post opposite to the first magnetic post.

8. The integrated inductor according to claim 7, characterized in that, The number of magnetic cores is multiple, and the multiple magnetic cores are arranged sequentially along the second direction. The second side post of one of the two adjacent magnetic cores and the first side post of the other of the two adjacent magnetic cores are an integral structural component. The first winding is wound around the outer periphery of the first magnetic post in each magnetic core, and the second winding is wound around the outer periphery of the second magnetic post in each magnetic core.

9. The integrated inductor according to any one of claims 1-6, characterized in that, The first side post and the first magnetic post are arranged along a third direction, and the second side post and the second magnetic post are arranged along the third direction. The third direction, the first direction, and the second direction are perpendicular to each other.

10. The integrated inductor according to claim 9, characterized in that, Along the third direction, the first side post and the second side post are located on the same side of the first magnetic yoke.

11. The integrated inductor according to claim 10, characterized in that, The number of magnetic cores is multiple, and the multiple magnetic cores are arranged sequentially along the third direction; The plurality of magnetic cores include adjacent first magnetic cores and second magnetic cores, wherein the first side post in the first magnetic core and the first side post in the second magnetic core are arranged facing each other and are integral structural components, and the second side post in the first magnetic core and the second side post in the second magnetic core are arranged facing each other and are integral structural components; The first winding is wound around the outer periphery of the first magnetic post in each magnetic core, and the second winding is wound around the outer periphery of the second magnetic post in each magnetic core.

12. The integrated inductor according to claim 11, characterized in that, The second magnetic core includes two first side posts. Along the third direction, the two first side posts are located on opposite sides of the first magnetic post. The first side post in the second magnetic core that is closer to the first magnetic core is arranged facing each other and is an integral structural component with the first side post in the first magnetic core. The second magnetic core includes two second side posts. Along the third direction, the two second side posts are located on opposite sides of the second magnetic post. The second side post in the second magnetic core that is closer to the first magnetic core is arranged facing the second side post in the first magnetic core and is an integral structural component. The plurality of magnetic cores also include a third magnetic core. Along the third direction, the third magnetic core is disposed on the side of the second magnetic core away from the first magnetic core. The first side post of the third magnetic core and the first side post of the second magnetic core away from the first magnetic core are arranged facing each other and are an integral structural component. The second side post of the third magnetic core and the second side post of the second magnetic core away from the first magnetic core are arranged facing each other and are an integral structural component.

13. The integrated inductor according to claim 9, characterized in that, The first side post includes two, and along the third direction, the two first side posts are disposed on opposite sides of the first magnetic post; The second side post includes two, and along the third direction, the two second side posts are located on opposite sides of the second magnetic post.

14. The integrated inductor according to any one of claims 1-6, characterized in that, The first side post includes a first part and a second part. The first part and the second part are both connected to the two ends of the first magnetic post. The first part is located on the side of the first magnetic post away from the second magnetic post. The second part and the first magnetic post are arranged along a third direction. The third direction, the first direction and the second direction are perpendicular to each other. The second side post includes a third part and a fourth part, both of which are connected to the two ends of the second magnetic post. The third part is located on the side of the second magnetic post away from the first magnetic post, and the fourth part and the second magnetic post are arranged along a third direction.

15. The integrated inductor according to claim 14, characterized in that, Along the third direction, the second part and the fourth part are located on the same side of the first magnetic yoke.

16. The integrated inductor according to claim 15, characterized in that, The number of magnetic cores is multiple, and the multiple magnetic cores are arranged sequentially along the third direction; The plurality of magnetic cores include an adjacent first magnetic core and a second magnetic core, wherein a second portion of the first magnetic core and a second portion of the second magnetic core are arranged facing each other and are integral structural components, and a fourth portion of the first magnetic core and a fourth portion of the second magnetic core are arranged facing each other and are integral structural components; The first winding is wound around the outer periphery of the first magnetic post in each magnetic core, and the second winding is wound around the outer periphery of the second magnetic post in each magnetic core.

17. The integrated inductor according to claim 16, characterized in that, The second part of the second magnetic core includes two parts. Along the third direction, the two second parts are located on opposite sides of the first magnetic post. The second part of the second magnetic core that is closer to the first magnetic core is arranged facing the second part of the first magnetic core and is an integral structural component. The second magnetic core includes two fourth parts. Along the third direction, the two fourth parts are located on opposite sides of the second magnetic column. The fourth part of the second magnetic core that is closer to the first magnetic core is arranged facing the fourth part of the first magnetic core and is an integral structural component. The plurality of magnetic cores further includes a third magnetic core. Along the third direction, the third magnetic core is disposed on the side of the second magnetic core away from the first magnetic core. The second part of the third magnetic core and the second part of the second magnetic core away from the first magnetic core are arranged facing each other and are an integral structural component. The fourth part of the third magnetic core and the fourth part of the second magnetic core away from the first magnetic core are arranged facing each other and are an integral structural component.

18. The integrated inductor according to claim 15, characterized in that, The second part comprises two parts, which are disposed on opposite sides of the first magnetic post along the third direction; The fourth part comprises two parts, which are located on opposite sides of the second magnetic post along the third direction.

19. The integrated inductor according to claim 18, characterized in that, The number of magnetic cores is multiple, and the multiple magnetic cores are arranged sequentially along the third direction; The second part of one of the two adjacent magnetic cores and the second part of the other of the two adjacent magnetic cores are arranged facing each other and are an integral structural component; the fourth part of one of the two adjacent magnetic cores and the fourth part of the other of the two adjacent magnetic cores are arranged facing each other and are an integral structural component. The first winding is wound around the outer periphery of the first magnetic post in each magnetic core, and the second winding is wound around the outer periphery of the second magnetic post in each magnetic core.

20. The integrated inductor according to any one of claims 1-19, characterized in that, The first magnetic post and the second magnetic post are both disposed between the first magnetic yoke and the second magnetic yoke, and one end of the first magnetic post and one end of the second magnetic post are both connected to the side wall of the first magnetic yoke facing the second magnetic yoke, and the other end of the first magnetic post and the other end of the second magnetic post are both connected to the side wall of the second magnetic yoke facing the first magnetic yoke. One end of the first side post is connected to the end of the first magnetic yoke opposite to the second side post and is connected to one end of the first magnetic post through the first magnetic yoke; the other end is connected to the end of the second magnetic yoke opposite to the second side post and is connected to the other end of the first magnetic post through the second magnetic yoke. One end of the second side post is connected to the end of the first magnetic yoke opposite to the first side post and is connected to one end of the second magnetic post through the first magnetic yoke; the other end is connected to the end of the second magnetic yoke opposite to the first side post and is connected to one end of the second magnetic post through the second magnetic yoke.

21. The integrated inductor according to any one of claims 1-19, characterized in that, The first magnetic yoke and the second magnetic yoke are both disposed between the first magnetic post and the second magnetic post, and one end of the first magnetic yoke and one end of the second magnetic yoke are both connected to the side wall of the first magnetic post facing the second magnetic post, and the other end of the first magnetic yoke and the other end of the second magnetic yoke are both connected to the side wall of the second magnetic post facing the first magnetic post. The two ends of the first side post are in contact with the two ends of the first magnetic post, and the two ends of the second side post are in contact with the two ends of the second magnetic post.

22. A power converter, characterized in that, Includes a housing, a circuit board, a power circuit, and an integrated inductor as described in any one of claims 1-20; wherein: The housing is used to house the circuit board and the power circuit, both of which are electrically connected to the circuit board.

23. The power converter according to claim 22, characterized in that, The power circuit is an interleaved parallel inverter circuit, including three-phase switch arms in parallel. Each phase of the switch arm includes two half-bridge units in parallel. The midpoint of each half-bridge unit serves as the output terminal of the switch arm. The three switch arms are used to convert DC power into three-phase AC power with the same frequency but different phases. The integrated inductor includes three first windings and three second windings. One end of each of the three first windings is connected to the bridge arm output terminal of one half-bridge unit of one phase of the three-phase switch bridge arm. One end of each of the three second windings is connected to the bridge arm output terminal of the other half-bridge unit of one phase of the three-phase switch bridge arm. The first winding and the second winding connected to the bridge arm output terminals of the two half-bridge units of one phase of the switch bridge arm are connected in parallel to form one phase output terminal.

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