Matrix transformer

Abstract

The matrix transformer comprises two magnetic core middle columns, two magnetic core side legs, two groups of primary windings, two groups of secondary windings and an auxiliary winding. And the two magnetic core middle columns are arranged between the two magnetic core side legs. And the two magnetic core middle columns and the two magnetic core side legs are arranged in parallel. And the two groups of primary windings are respectively wound on the two magnetic core middle columns. And the two groups of secondary windings are respectively wound on the two magnetic core middle columns. And the two groups of primary windings are connected in series to form the primary winding. And the two groups of secondary windings are connected in parallel to form the secondary winding. And the auxiliary winding is wound on one of the two magnetic core side legs. And the auxiliary winding is connected in parallel with the primary winding or the secondary winding. Controllable magnetic flux distribution is achieved by adjusting the number of turns of the auxiliary winding.

Description

Technical Field

[0001] The present invention relates to a matrix transformer, and more particularly to a matrix transformer having auxiliary windings wound on side legs of a magnetic core. Background Art

[0002] In recent years, the electricity usage of large data centers has increased significantly. As power demand continues to increase, input series output parallel (ISOP) converters have been proposed to address the voltage stress problems of the primary switches and the current stress problems of the secondary rectifier (SR). Matrix transformers (MTs) are widely used in ISOP converters due to their advantages such as small size, modularity, and simple manufacturing. However, in traditional matrix transformer structures, the flux distribution depends on the consistency of the air gap between the core and the top plate and the manufacturing tolerances. If the air gap is inconsistent and / or there are manufacturing tolerances, the magnetic flux of the core center leg will not be evenly distributed between the core side legs and the metal plate on which the core is mounted. Summary of the Invention

[0003] The present invention aims to provide a matrix transformer comprising a first core leg, a second core leg, a first core leg, a second core leg, a first primary winding, a first secondary winding, a second primary winding, a second secondary winding, and a first auxiliary primary winding. The first core leg and the second core leg are disposed between the first core leg and the second core leg. The first core leg, the first core leg, the second core leg, and the second core leg are arranged in parallel. The first primary winding and the first secondary winding are wound on the first core leg. The second primary winding and the second secondary winding are wound on the second core leg. The first primary winding and the second primary winding are connected in series to form a primary winding. The first secondary winding and the second secondary winding are connected in parallel to form a secondary winding. The first auxiliary primary winding is wound on the first core leg and connected in parallel to the primary winding.

[0004] In some embodiments, a winding direction of the first auxiliary primary winding is opposite to a winding direction of the first primary winding.

[0005] In some embodiments, the number of turns of the primary winding is N p , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o , the number of turns of the first auxiliary primary winding is N L, the magnetic flux flowing through the first core leg is Φ l , which satisfies the following formula: N p Φ o =N L Φ l .

[0006] In some embodiments, the number of turns of the primary winding is N p , the number of turns of the first auxiliary primary winding is N L , which satisfies the following formula: N L =2N p .

[0007] In some embodiments, the number of turns of the primary winding is N p , the number of turns of the first auxiliary primary winding is N L , which satisfies the following formula: N L =(16 / 7)N p .

[0008] In some embodiments, the matrix transformer further includes a base plate. The base plate is provided with the first magnetic core side leg, the first magnetic core center leg, the second magnetic core center leg, and the second magnetic core side leg. The magnetic flux flowing through the first magnetic core center leg and the second magnetic core center leg is Φ o , the magnetic flux flowing through the first core leg is Φ l , the magnetic flux flowing through the bottom plate is Φ b , which satisfies the following formula: Φ o =Φ l +Φ b .

[0009] In some embodiments, Φ l =Φ b =Φ o / 2.

[0010] In some embodiments, the matrix transformer further includes a second auxiliary primary winding wound on the second magnetic core leg and connected in parallel with the primary winding.

[0011] In some embodiments, the winding direction of the first auxiliary primary winding is opposite to that of the first primary winding, and the winding direction of the second auxiliary primary winding is opposite to that of the second primary winding.

[0012] In some embodiments, the number of turns of the primary winding is N p , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o The total number of turns of the first auxiliary primary winding and the second auxiliary primary winding is N L, the magnetic flux flowing through the first core leg and the second core leg is Φ l , which satisfies the following formula: N p Φ o =N L Φ l .

[0013] The present invention further provides a matrix transformer comprising a first core leg, a second core leg, a first core leg, a second core leg, a first primary winding, a first secondary winding, a second primary winding, a second secondary winding, and a first auxiliary secondary winding. The first core leg and the second core leg are disposed between the first core leg and the second core leg. The first core leg, the first core leg, the second core leg, and the second core leg are arranged in parallel. The first primary winding and the first secondary winding are wound on the first core leg. The second primary winding and the second secondary winding are wound on the second core leg. The first primary winding and the second primary winding are connected in series to form a primary winding. The first secondary winding and the second secondary winding are connected in parallel to form a secondary winding. The first auxiliary secondary winding is wound on the first core leg and connected in parallel to the secondary winding.

[0014] In some embodiments, a winding direction of the first auxiliary secondary winding is opposite to a winding direction of the first secondary winding.

[0015] In some embodiments, the number of turns of the first secondary winding is N s , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o , the number of turns of the first auxiliary secondary winding is N L , the magnetic flux flowing through the first core leg is Φ l , which satisfies the following formula: N s Φ o =N L Φ l .

[0016] In some embodiments, the number of turns of the first secondary winding is N s , the number of turns of the first auxiliary secondary winding is N L , which satisfies the following formula: N L =2N s .

[0017] In some embodiments, the number of turns of the first secondary winding is N s , the number of turns of the first auxiliary secondary winding is N L , which satisfies the following formula: N L =(16 / 7)Ns .

[0018] In some embodiments, the matrix transformer further includes a base plate. The base plate is provided with the first magnetic core side leg, the first magnetic core center leg, the second magnetic core center leg, and the second magnetic core side leg. The magnetic flux flowing through the first magnetic core center leg and the second magnetic core center leg is Φ o , the magnetic flux flowing through the first core leg is Φ l , the magnetic flux flowing through the bottom plate is Φ b , which satisfies the following formula: Φ o =Φ l +Φ b .

[0019] In some embodiments, Φ l =Φ b =Φ o / 2.

[0020] In some embodiments, the matrix transformer further includes a second auxiliary secondary winding wound on the second magnetic core leg and connected in parallel to the secondary winding.

[0021] In some embodiments, a winding direction of the first auxiliary secondary winding is opposite to a winding direction of the first secondary winding, and a winding direction of the second auxiliary secondary winding is opposite to a winding direction of the second secondary winding.

[0022] In some embodiments, the number of turns of the first secondary winding and the second secondary winding are both N s , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o The total number of turns of the first auxiliary secondary winding and the second auxiliary secondary winding is N L , the magnetic flux flowing through the first core leg and the second core leg is Φ l , which satisfies the following formula: N s Φ o =N L Φ l .

[0023] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] A better understanding of the present invention can be gained from the following detailed description in conjunction with the accompanying drawings. It should be noted that, in accordance with standard industry practice, the various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or decreased to facilitate clarity of discussion.

[0025] Figure 1 It is a schematic diagram used to illustrate the uneven distribution of magnetic flux in the matrix transformer;

[0026] Figure 2 is a schematic diagram of a matrix transformer according to a first embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a matrix transformer according to a second embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of a matrix transformer according to a third embodiment of the present invention;

[0029] Figure 5 FIG. 4 is a schematic diagram of a matrix transformer according to a fourth embodiment of the present invention.

[0030] The description of the accompanying drawings is as follows:

[0031] 10, 20, 30, 40: Matrix transformer

[0032] AG: Air Gap

[0033] APW1, APW2: Auxiliary primary winding

[0034] ASW1, ASW2: auxiliary secondary winding

[0035] BP: Baseplate

[0036] CL, CL1, CL2: core column

[0037] PW, PW1, PW2: primary winding

[0038] SL, SL1, SL2: core side legs

[0039] SW, SW1, SW2: secondary winding

[0040] TP: Top Plate

[0041] Φb, Φl, Φo: magnetic flux DETAILED DESCRIPTION

[0042] The following is a detailed discussion of embodiments of the present invention. However, it will be appreciated that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific contexts. The embodiments discussed and disclosed are for illustration only and are not intended to limit the scope of the present invention. As used herein, the terms "first," "second," "third," etc., do not specifically refer to order or precedence; they are intended solely to distinguish between elements or operations described using the same technical terminology.

[0043] Figure 1 It is a schematic diagram used to illustrate the uneven distribution of magnetic flux in the matrix transformer. Figure 1 The matrix transformer shown is a full-wave rectifier, comprising two core legs CL, two core legs SL, a top plate TP, a bottom plate BP, two sets of primary windings PW, and two sets of secondary windings SW. The two sets of primary windings PW are wound on the two core legs CL, and the two sets of primary windings PW are connected in series to provide primary voltage input. The two sets of secondary windings SW are wound on the two core legs CL, and the two sets of secondary windings SW are connected in parallel to output secondary voltage. In other words, Figure 1 The matrix transformer shown is an input series output parallel (ISOP) converter, and Figure 1 The matrix transformer shown is used in a DC / DC converter.

[0044] like Figure 1 As shown, an air gap AG is present between the core legs SL and the top plate TP. Ideally, the magnetic flux flowing through the core legs CL would be evenly distributed between the core legs SL and the metal plates (including the top plate TP and the bottom plate BP). However, this uniform distribution of magnetic flux depends on the consistency of the air gap AG and manufacturing tolerances. Actual measurements have shown that if the air gaps AG are inconsistent and / or have manufacturing tolerances, the majority of the magnetic flux from the core legs CL will flow through the portion of the bottom plate BP located between the core legs CL (i.e., the magnetic flux flowing through the core legs SL will be lower than the magnetic flux flowing through the bottom plate BP), resulting in low utilization of the core legs SL. This results in uneven distribution of core loss, which can cause heat dissipation issues and also result in higher core loss, for example, approximately 1.89W.

[0045] Figure 2 Figure 1 is a schematic diagram of a matrix transformer 10 according to a first embodiment of the present invention. Matrix transformer 10 includes core legs CL1 and CL2, core legs SL1 and SL2, a top plate TP, a bottom plate BP, primary windings PW1 and PW2, secondary windings SW1 and SW2, and an auxiliary primary winding APW1. Core legs CL1 and CL2 and core legs SL1 and SL2 are disposed on bottom plate BP. Core legs CL1 and CL2 are disposed between core legs SL1 and SL2. Core legs SL1, CL1, CL2, and SL2 are arranged in parallel.

[0046] The primary winding PW1 and the secondary winding SW1 are wound around the center leg CL1 of the magnetic core. The primary winding PW2 and the secondary winding SW2 are wound around the center leg CL2 of the magnetic core. The primary windings PW1 and PW2 are connected in series to form the primary winding. The secondary windings SW1 and SW2 are connected in parallel to form the secondary winding. Figure 2 and Figure 1 Similar, the main difference is that Figure 2 The matrix transformer 10 further includes an auxiliary primary winding APW1 wound on the magnetic core side leg SL1 , and the auxiliary primary winding APW1 is connected in parallel to the primary winding formed by the primary windings PW1 and PW2 .

[0047] In the first embodiment of the present invention, the winding direction of the auxiliary primary winding APW1 is opposite to the winding direction of the primary winding PW1, wherein Figure 2 As shown, the magnetic core side leg SL1 around which the auxiliary primary winding APW1 is wound is adjacent to the magnetic core center leg CL1 around which the primary winding PW1 is wound.

[0048] Specifically, because the primary voltage is applied to the auxiliary primary winding APW1, the magnetic flux flowing through the core leg SL1 is constant according to Faraday's law. Furthermore, the matrix transformer 10 only draws a very low balanced exciting current, for example, approximately 0.1 ampere. Therefore, thick wire is not required for the auxiliary primary winding APW1.

[0049] In the first embodiment of the present invention, the number of turns of the primary winding is N p (The primary windings PW1 and PW2 are connected in series, and the number of turns of the primary winding PW1 is N p / 2, the number of turns of the primary winding PW2 is N p / 2), the magnetic flux flowing through the core legs CL1 and CL2 is Φ o , the number of turns of the auxiliary primary winding APW1 is N L , the magnetic flux flowing through the core side leg SL1 is Φ l , the magnetic flux flowing through the bottom plate BP and the top plate TP is Φ b , which satisfies the following formula: N p Φ o =N L Φ l , and satisfy the following formula: Φ o =Φ l +Φ b .

[0050] As can be seen from the above equation, the magnetic flux distribution of the matrix transformer 10 is not affected by the magnetic reluctance distribution, thus improving the consistency. In other words, the magnetic flux distribution of the matrix transformer 10 is not affected by air gap inconsistency and / or manufacturing tolerance. In addition, the number of turns N of the auxiliary primary winding APW1 can be adjusted. L To achieve controllable magnetic flux distribution, the matrix transformer 10 can be applied to various application scenarios. Figure 1 The matrix transformer, Figure 2 The matrix transformer 10 is only added with an auxiliary primary winding, so the matrix transformer 10 is low-cost and easy to implement.

[0051] For example, the number of turns N of the auxiliary primary winding APW1 can be adjusted L To satisfy the following formula: N L =2N p , so that the magnetic flux distribution of the matrix transformer 10 will satisfy the following formula: Φ l =Φ b =Φ o / 2. That is, the magnetic flux of the core legs CL1 and CL2 is Φ o The core loss is evenly distributed between the core legs (including the core legs SL1 and SL2) and the metal plates (including the bottom plate BP and the top plate TP). This achieves a uniform core loss distribution, resulting in better heat dissipation performance and the ability to efficiently increase power density.

[0052] It is worth mentioning that due to the different volumes of the metal plate and the side legs of the magnetic core, the magnetic flux distribution described in the previous paragraph is not the most efficient distribution. At the same time, the magnetic flux distribution described in the previous paragraph still has relatively high iron loss, for example, the iron loss is about 1.89W.

[0053] In a preferred embodiment of the present invention, the number of turns N of the auxiliary primary winding APW1 can be adjusted. L To satisfy the following formula: N L =(16 / 7)N p In this way, although the uniformity of the magnetic flux distribution is worse than the magnetic flux distribution described in the first two paragraphs, a better iron loss distribution can be achieved, and the iron loss is lower, for example, the iron loss is about 1.81W.

[0054] Figure 3 FIG. 2 is a schematic diagram of a matrix transformer 20 according to a second embodiment of the present invention. Figure 3 The matrix transformer 20 with Figure 2 The matrix transformer 10 is similar to the main difference. Figure 3 The matrix transformer 20 further includes an auxiliary primary winding APW2 wound on the magnetic core side leg SL2. The auxiliary primary winding APW2 is connected in parallel to the primary winding formed by the primary windings PW1 and PW2.

[0055] In the second embodiment of the present invention, the winding direction of the auxiliary primary winding APW1 is opposite to the winding direction of the primary winding PW1, wherein Figure 3As shown, the magnetic core side leg SL1 wound by the auxiliary primary winding APW1 is adjacent to the magnetic core center leg CL1 wound by the primary winding PW1. In the second embodiment of the present invention, the winding direction of the auxiliary primary winding APW2 is opposite to the winding direction of the primary winding PW2, wherein, as Figure 3 As shown, the magnetic core side leg SL2 around which the auxiliary primary winding APW2 is wound is adjacent to the magnetic core center leg CL2 around which the primary winding PW2 is wound.

[0056] Specifically, because the primary voltage is applied to the auxiliary primary windings APW1 and APW2, the magnetic flux flowing through the core legs SL1 and SL2 is constant according to Faraday's law. Furthermore, the matrix transformer 20 only draws a very low balancing excitation current, for example, approximately 0.1 ampere. Therefore, thick wire is not required for the auxiliary primary windings APW1 and APW2.

[0057] In the second embodiment of the present invention, the number of turns of the primary winding is N p (The primary windings PW1 and PW2 are connected in series, and the number of turns of the primary winding PW1 is N p / 2, the number of turns of the primary winding PW2 is N p / 2), the magnetic flux flowing through the core legs CL1 and CL2 is Φ o The total number of turns of the auxiliary primary windings APW1 and APW2 is N L (The number of turns of the auxiliary primary winding APW1 is N L / 2, the number of turns of the auxiliary primary winding APW2 is N L / 2), the magnetic flux flowing through the core leg SL1 is Φ l , the magnetic flux flowing through the bottom plate BP and the top plate TP is Φ b , which satisfies the following formula: N p Φ o =N L Φ l , and satisfy the following formula: Φ o =Φ l +Φ b .

[0058] As can be seen from the above equation, the magnetic flux distribution of the matrix transformer 20 is not affected by the magnetic resistance distribution, thus improving the consistency. In other words, the magnetic flux distribution of the matrix transformer 20 is not affected by air gap inconsistency and / or manufacturing tolerance. In addition, the total number of turns N of the auxiliary primary windings APW1 and APW2 can be adjusted. L To achieve controllable magnetic flux distribution, the matrix transformer 20 can be applied to various application scenarios. Figure 1 The matrix transformer, Figure 3 The matrix transformer 20 is only added with an auxiliary primary winding, so the matrix transformer 20 is low-cost and easy to implement.

[0059] For example, the total number of turns N of the auxiliary primary windings APW1 and APW2 can be adjusted L To satisfy the following formula: N L =2N p , so that the magnetic flux distribution of the matrix transformer 20 will satisfy the following formula: Φ l =Φ b =Φ o / 2. That is, the magnetic flux of the core legs CL1 and CL2 is Φ o It will be evenly distributed between the core side legs (including the core side legs SL1 and SL2) and the metal plates (including the bottom plate BP and the top plate TP). Accordingly, a uniform iron loss distribution is achieved, thereby having better heat dissipation performance and being able to effectively increase power density.

[0060] It is worth mentioning that due to the different volumes of the metal plate and the side legs of the magnetic core, the magnetic flux distribution described in the previous paragraph is not the most efficient distribution. At the same time, the magnetic flux distribution described in the previous paragraph still has relatively high iron loss, for example, the iron loss is about 1.89W.

[0061] In a preferred embodiment of the present invention, the total number of turns N of the auxiliary primary windings APW1 and APW2 can be adjusted. L To satisfy the following formula: N L =(16 / 7)N p In this way, although the uniformity of the magnetic flux distribution is worse than the magnetic flux distribution described in the first two paragraphs, a better iron loss distribution can be achieved, and the iron loss is lower, for example, the iron loss is about 1.81W.

[0062] Figure 4 FIG. 1 is a schematic diagram of a matrix transformer 30 according to a third embodiment of the present invention. Figure 4 The matrix transformer 30 with Figure 2 The matrix transformer 10 is similar to the main difference. Figure 4 The matrix transformer 30 does not include an auxiliary primary winding APW1, but includes an auxiliary secondary winding ASW1 wound on the core side leg SL1, and the auxiliary secondary winding ASW1 is connected in parallel to the secondary winding composed of the secondary windings SW1 and SW2.

[0063] In the first embodiment of the present invention, the winding direction of the auxiliary secondary winding ASW1 is opposite to the winding direction of the secondary winding SW1, wherein Figure 4 As shown, the magnetic core side leg SL1 around which the auxiliary secondary winding ASW1 is wound is adjacent to the magnetic core center leg CL1 around which the secondary winding SW1 is wound.

[0064] Specifically, because the secondary voltage is applied to the auxiliary secondary winding ASW1, the magnetic flux flowing through the core leg SL1 is constant according to Faraday's law. Furthermore, the matrix transformer 30 only has an extremely low balancing excitation current, such as approximately 0.1 ampere. Therefore, thick wire is not required for the auxiliary secondary winding ASW1.

[0065] In the third embodiment of the present invention, the number of turns of the secondary winding is N s (The secondary windings SW1 and SW2 are connected in parallel, and the number of turns of the secondary windings SW1 and SW2 are both N s ), the magnetic flux flowing through the core legs CL1 and CL2 is Φ o , the number of turns of the auxiliary secondary winding ASW1 is N L , the magnetic flux flowing through the core side leg SL1 is Φ l , the magnetic flux flowing through the bottom plate BP and the top plate TP is Φ b , which satisfies the following formula: N s Φ o =N L Φ l , and satisfy the following formula: Φ o =Φ l +Φ b .

[0066] As can be seen from the above equation, the magnetic flux distribution of the matrix transformer 30 is not affected by the magnetic resistance distribution, thus improving the consistency. In other words, the magnetic flux distribution of the matrix transformer 30 is not affected by air gap inconsistency and / or manufacturing tolerance. In addition, the number of turns N of the auxiliary secondary winding ASW1 can be adjusted. L To achieve controllable magnetic flux distribution, the matrix transformer 30 can be applied to various application scenarios. Figure 1 The matrix transformer, Figure 4 The matrix transformer 30 is only added with an auxiliary secondary winding, so the matrix transformer 30 is low-cost and easy to implement.

[0067] For example, the number of turns N of the auxiliary secondary winding ASW1 can be adjusted L To satisfy the following formula: N L =2N s , so that the magnetic flux distribution of the matrix transformer 30 will satisfy the following formula: Φ l =Φ b =Φ o / 2. That is, the magnetic flux of the core legs CL1 and CL2 is Φ o It will be evenly distributed between the core side legs (including the core side legs SL1 and SL2) and the metal plates (including the bottom plate BP and the top plate TP). Accordingly, a uniform iron loss distribution is achieved, thereby having better heat dissipation performance and being able to effectively increase power density.

[0068] It is worth mentioning that due to the different volumes of the metal plate and the side legs of the magnetic core, the magnetic flux distribution described in the previous paragraph is not the most efficient distribution. At the same time, the magnetic flux distribution described in the previous paragraph still has relatively high iron loss, for example, the iron loss is about 1.89W.

[0069] In a preferred embodiment of the present invention, the number of turns N of the auxiliary secondary winding ASW1 can be adjusted. L To satisfy the following formula: N L =(16 / 7)N s In this way, although the uniformity of the magnetic flux distribution is worse than the magnetic flux distribution described in the first two paragraphs, a better iron loss distribution can be achieved, and the iron loss is lower, for example, the iron loss is about 1.81W.

[0070] Figure 5 FIG. 4 is a schematic diagram of a matrix transformer 40 according to a fourth embodiment of the present invention. Figure 5 The matrix transformer 40 with Figure 4 The matrix transformer 30 is similar to the main difference. Figure 5 The matrix transformer 40 further includes an auxiliary secondary winding ASW2 wound on the magnetic core side leg SL2. The auxiliary secondary winding ASW2 is connected in parallel to the secondary winding formed by the secondary windings SW1 and SW2.

[0071] In the fourth embodiment of the present invention, the winding direction of the auxiliary secondary winding ASW1 is opposite to the winding direction of the secondary winding SW1, wherein Figure 5 As shown, the magnetic core side leg SL1 wound by the auxiliary secondary winding ASW1 is adjacent to the magnetic core center leg CL1 wound by the secondary winding SW1. In the fourth embodiment of the present invention, the winding direction of the auxiliary secondary winding ASW2 is opposite to the winding direction of the secondary winding SW2, wherein, as Figure 5 As shown, the magnetic core side leg SL2 around which the auxiliary secondary winding ASW2 is wound is adjacent to the magnetic core center leg CL2 around which the secondary winding SW2 is wound.

[0072] Specifically, because the secondary voltage is applied to the auxiliary secondary windings ASW1 and ASW2, the magnetic flux flowing through the core legs SL1 and SL2 is constant according to Faraday's law. Furthermore, the matrix transformer 40 only draws a very low balancing excitation current, for example, approximately 0.1 ampere. Therefore, thick wire is not required for the auxiliary secondary windings ASW1 and ASW2.

[0073] In the fourth embodiment of the present invention, the number of turns of the secondary winding is N s (The secondary windings SW1 and SW2 are connected in parallel, and the number of turns of the secondary windings SW1 and SW2 are both N s ), the magnetic flux flowing through the core legs CL1 and CL2 is Φo , the total number of turns of the auxiliary secondary windings ASW1 and ASW2 is N L (The number of turns of the auxiliary secondary winding ASW1 is N L / 2, the number of turns of the auxiliary secondary winding ASW2 is N L / 2), the magnetic flux flowing through the core leg SL1 is Φ l , the magnetic flux flowing through the bottom plate BP and the top plate TP is Φ b , which satisfies the following formula: N s Φ o =N L Φ l , and satisfy the following formula: Φ o =Φ l +Φ b .

[0074] As can be seen from the above equation, the magnetic flux distribution of the matrix transformer 40 is not affected by the magnetic resistance distribution, thus improving the consistency. In other words, the magnetic flux distribution of the matrix transformer 40 is not affected by air gap inconsistency and / or manufacturing tolerance. In addition, the total number of turns N of the auxiliary secondary windings ASW1 and ASW2 can be adjusted. L To achieve controllable magnetic flux distribution, the matrix transformer 40 can be applied to various application scenarios. Figure 1 The matrix transformer, Figure 5 The matrix transformer 40 is only added with an auxiliary secondary winding, so the matrix transformer 40 is low-cost and easy to implement.

[0075] For example, the total number of turns N of the auxiliary secondary windings ASW1 and ASW2 can be adjusted L To satisfy the following formula: N L =2N p , so that the magnetic flux distribution of the matrix transformer 40 will satisfy the following formula: Φ l =Φ b =Φ o / 2. That is, the magnetic flux of the core legs CL1 and CL2 is Φ o It will be evenly distributed between the core side legs (including the core side legs SL1 and SL2) and the metal plates (including the bottom plate BP and the top plate TP). Accordingly, a uniform iron loss distribution is achieved, thereby having better heat dissipation performance and being able to effectively increase power density.

[0076] It is worth mentioning that due to the different volumes of the metal plate and the side legs of the magnetic core, the magnetic flux distribution described in the previous paragraph is not the most efficient distribution. At the same time, the magnetic flux distribution described in the previous paragraph still has relatively high iron loss, for example, the iron loss is about 1.89W.

[0077] In a preferred embodiment of the present invention, the total number of turns N of the auxiliary secondary windings ASW1 and ASW2 can be adjusted. L To satisfy the following formula: N L =(16 / 7)N s In this way, although the uniformity of the magnetic flux distribution is worse than the magnetic flux distribution described in the first two paragraphs, a better iron loss distribution can be achieved, and the iron loss is lower, for example, the iron loss is about 1.81W.

[0078] In summary, the present invention proposes a matrix transformer with auxiliary windings (auxiliary primary windings or auxiliary secondary windings) wound on the side legs of the magnetic core, which can achieve controllable magnetic flux distribution by adjusting the number of turns of the auxiliary windings.

[0079] The above summarizes the features of several embodiments so that those skilled in the art can better understand the aspects of the present invention. Those skilled in the art will understand that they can easily use this invention as a basis to design or modify other processes and structures to achieve the same goals and / or obtain the same advantages as the embodiments described herein. Those skilled in the art will also understand that these equivalent constructions do not depart from the spirit and scope of the present invention, and that they can make various changes, substitutions, and modifications without departing from the spirit and scope of the present invention.

Claims

1. A matrix transformer, characterized in that: include: a first magnetic core side leg and a second magnetic core side leg; A first magnetic core center column and a second magnetic core center column are arranged between the first magnetic core side leg and the second magnetic core side leg, and the first magnetic core side leg, the first magnetic core center column, the second magnetic core center column and the second magnetic core side leg are arranged in parallel in sequence; A first primary winding and a first secondary winding are wound on the center leg of the first magnetic core; a second primary winding and a second secondary winding, wound on the center leg of the second magnetic core, wherein the first primary winding and the second primary winding are connected in series to form a primary winding, and the first secondary winding and the second secondary winding are connected in parallel to form a secondary winding; and A first auxiliary primary winding is wound on the first magnetic core side leg and connected in parallel with the primary winding.

2. The matrix transformer according to claim 1, characterized in that: The winding direction of the first auxiliary primary winding is opposite to the winding direction of the first primary winding.

3. The matrix transformer according to claim 1, characterized in that The number of turns of the primary winding is N p , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o , the number of turns of the first auxiliary primary winding is N L , the magnetic flux flowing through the first core leg is Φ l , which satisfies the following formula: N p Φ o =N L Φ l .

4. The matrix transformer according to claim 1, characterized in that The number of turns of the primary winding is N p , the number of turns of the first auxiliary primary winding is N L , which satisfies the following formula: N L =2N p .

5. The matrix transformer according to claim 1, characterized in that: The number of turns of the primary winding is N p , the number of turns of the first auxiliary primary winding is N L , which satisfies the following formula: N L =(16 / 7)N p .

6. The matrix transformer according to claim 1, characterized in that: Also includes: A bottom plate, on which the first magnetic core side legs, the first magnetic core middle column, the second magnetic core middle column and the second magnetic core side legs are arranged; The magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o , the magnetic flux flowing through the first core leg is Φ l , the magnetic flux flowing through the bottom plate is Φ b , which satisfies the following formula: Φ o =Φ l +Φ b .

7. The matrix transformer according to claim 6, characterized in that: F l =Φ b =Φ o / 2.

8. The matrix transformer according to claim 1, characterized in that: Also includes: The second auxiliary primary winding is wound on the second magnetic core side leg and connected in parallel with the primary winding.

9. The matrix transformer according to claim 8, characterized in that: The winding direction of the first auxiliary primary winding is opposite to that of the first primary winding, and the winding direction of the second auxiliary primary winding is opposite to that of the second primary winding.

10. The matrix transformer according to claim 8, characterized in that: The number of turns of the primary winding is N p , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o The total number of turns of the first auxiliary primary winding and the second auxiliary primary winding is N L , the magnetic flux flowing through the first core leg and the second core leg is Φ l , which satisfies the following formula: N p Φ o =N L Φ l .

11. A matrix transformer, characterized in that: include: a first magnetic core side leg and a second magnetic core side leg; A first magnetic core center column and a second magnetic core center column are arranged between the first magnetic core side leg and the second magnetic core side leg, and the first magnetic core side leg, the first magnetic core center column, the second magnetic core center column and the second magnetic core side leg are arranged in parallel in sequence; A first primary winding and a first secondary winding are wound on the center leg of the first magnetic core; a second primary winding and a second secondary winding, wound on the center leg of the second magnetic core, wherein the first primary winding and the second primary winding are connected in series to form a primary winding, and the first secondary winding and the second secondary winding are connected in parallel to form a secondary winding; and A first auxiliary secondary winding is wound on the first magnetic core side leg and connected in parallel with the secondary winding.

12. The matrix transformer according to claim 11, characterized in that: The winding direction of the first auxiliary secondary winding is opposite to the winding direction of the first secondary winding.

13. The matrix transformer according to claim 11, characterized in that: The number of turns of the first secondary winding is N s , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o , the number of turns of the first auxiliary secondary winding is N L , the magnetic flux flowing through the first core leg is Φ l , which satisfies the following formula: N s Φ o =N L Φ l .

14. The matrix transformer according to claim 11, characterized in that The number of turns of the first secondary winding is N s , the number of turns of the first auxiliary secondary winding is N L , which satisfies the following formula: N L =2N s .

15. The matrix transformer according to claim 11, characterized in that The number of turns of the first secondary winding is N s , the number of turns of the first auxiliary secondary winding is N L , which satisfies the following formula: N L =(16 / 7)N s .

16. The matrix transformer according to claim 11, characterized in that Also includes: A bottom plate, on which the first magnetic core side legs, the first magnetic core middle column, the second magnetic core middle column and the second magnetic core side legs are arranged; The magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o , the magnetic flux flowing through the first core leg is Φ l , the magnetic flux flowing through the bottom plate is Φ b , which satisfies the following formula: Φ o =Φ l +Φ b .

17. The matrix transformer according to claim 16, characterized in that: F l =Φ b =Φ o / 2.

18. The matrix transformer according to claim 11, characterized in that Also includes: The second auxiliary secondary winding is wound on the second magnetic core side leg and connected in parallel to the secondary winding.

19. The matrix transformer according to claim 18, characterized in that The winding direction of the first auxiliary secondary winding is opposite to that of the first secondary winding, and the winding direction of the second auxiliary secondary winding is opposite to that of the second secondary winding.

20. The matrix transformer according to claim 18, wherein: The number of turns of the first secondary winding and the second secondary winding is N. s , the magnetic flux flowing through the first magnetic core center column and the second magnetic core center column is Φ o The total number of turns of the first auxiliary secondary winding and the second auxiliary secondary winding is N L , the magnetic flux flowing through the first core leg and the second core leg is Φ l , which satisfies the following formula: N s Φ o =N L Φ l .

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