A ceramic planar transformer and power module

Abstract

The embodiment of the present application provides a kind of ceramic planar transformer and power module, ceramic planar transformer includes: medium component;Coil component is arranged on the medium component, the coil component includes: primary winding and at least two secondary windings;The at least two secondary windings are arranged on the two sides of the primary winding;The primary winding and the secondary winding are filled with air gap paste;The relative permeability of the medium component is higher than the relative permeability of the air gap paste.The ceramic planar transformer of the embodiment of the present application fills air gap paste between multiple coils, the relative permeability of medium component is higher than the relative permeability of air gap paste, air gap paste can prevent the self-coupling of magnetic flux in coil component to some extent, so as to force the magnetic flux of primary winding to pass through secondary winding as much as possible, so as to improve the coupling coefficient of primary winding and secondary winding.

Description

Technical Field

[0001] The present application relates to the technical field of ceramic planar transformers, and in particular to a ceramic planar transformer and a power supply module. Background Art

[0002] Compared with conventional transformers, ceramic planar transformers are significantly smaller in size, especially in height. This feature is very attractive in power supply equipment where space is strictly limited, making them the preferred magnetic component in many power supply equipment.

[0003] However, the ceramic planar transformer in the related art still has the disadvantage of large leakage inductance. Therefore, there is an urgent need for a ceramic planar transformer with smaller leakage inductance. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the embodiments of the present application is to provide a ceramic planar transformer and a power module.

[0005] In a first aspect, an embodiment of the present application provides a ceramic planar transformer, comprising:

[0006] media components;

[0007] A coil assembly is provided on the dielectric assembly, the coil assembly comprising a plurality of coils, the plurality of coils comprising: at least one primary winding and at least two secondary windings;

[0008] The at least two secondary windings are arranged on both sides of the primary winding;

[0009] An air gap slurry is provided between the plurality of coils of the coil assembly;

[0010] The relative magnetic permeability of the dielectric component is higher than the relative magnetic permeability of the air gap slurry.

[0011] In some embodiments of the present application, at least two secondary windings are arranged on both sides of the primary winding, and air gap slurry is filled between the multiple coils. The relative magnetic permeability of the dielectric component is higher than the relative magnetic permeability of the air gap slurry. The air gap slurry can prevent the self-coupling of the magnetic flux in the coil component to a certain extent, thereby forcing the magnetic flux of the primary winding to pass through the secondary winding as much as possible, thereby improving the coupling coefficient between the primary winding and the secondary winding.

[0012] In some embodiments of the present application, a ratio of the relative magnetic permeability of the dielectric component to the relative magnetic permeability of the air gap slurry is greater than 10.

[0013] In some embodiments of the present application, by making the ratio of the relative magnetic permeability of the dielectric component to the relative magnetic permeability of the air gap slurry greater than 10, the ability of the air gap slurry to prevent the self-coupling of the magnetic flux of the coil assembly is improved, and the magnetic flux of the primary winding is forced to pass through the secondary winding as much as possible, thereby improving the coupling coefficient between the primary winding and the secondary winding.

[0014] In some embodiments of the present application, the relative magnetic permeability of the dielectric component is greater than 50.

[0015] In some embodiments of the present application, the relative magnetic permeability of the dielectric component is greater than 50, thereby improving the ability of the air gap slurry to prevent the self-coupling of the magnetic flux of the coil component, forcing the magnetic flux of the primary winding to pass through the secondary winding as much as possible, thereby improving the coupling coefficient between the primary winding and the secondary winding.

[0016] In some embodiments of the present application, the relative magnetic permeability of the air gap slurry is less than 5.

[0017] In some embodiments of the present application, the relative magnetic permeability of the air gap slurry is less than 5, thereby improving the ability of the air gap slurry to prevent the self-coupling of the magnetic flux of the coil assembly, forcing the magnetic flux of the primary winding to pass through the secondary winding as much as possible, thereby improving the coupling coefficient between the primary winding and the secondary winding.

[0018] In some embodiments of the present application, a through hole is provided in the middle region of the coil assembly, a magnetic core is provided in the through hole, and the relative magnetic permeability of the magnetic core is greater than the relative magnetic permeability of the dielectric assembly.

[0019] In some embodiments of the present application, a through hole is provided in the middle area of ​​the coil assembly, and a magnetic core is provided in the through hole. The relative magnetic permeability of the magnetic core is greater than the relative magnetic permeability of the dielectric assembly, so that the magnetic core can provide a low-resistance magnetic channel when the coil assembly is working, further improving the coupling coefficient of the primary winding and the secondary winding in the coil assembly.

[0020] In some embodiments of the present application, the through hole is provided in the area surrounded by the innermost secondary winding of the coil assembly.

[0021] Some embodiments of the present application provide a through hole in the area surrounded by the innermost secondary winding in the coil assembly, so that the magnetic core in the through hole can provide a low-resistance magnetic channel for the magnetic flux of the coil assembly, thereby improving the coupling coefficient between the primary winding and the secondary winding in the coil assembly.

[0022] In some embodiments of the present application, the dielectric component includes: a plurality of first dielectric layers;

[0023] The multiple first dielectric layers are stacked;

[0024] At least one of the multiple first dielectric layers is provided with at least one primary winding and at least two secondary windings;

[0025] At least one second dielectric layer is provided in at least one first dielectric layer of at least one primary winding and at least two secondary windings;

[0026] The air gap slurry is arranged between the multiple coils of the second dielectric layer.

[0027] In some embodiments of the present application, at least one first dielectric layer in the multiple layers of first dielectric layers is simultaneously provided with at least one primary winding and at least two secondary windings; at least one second dielectric layer is present in at least one first dielectric layer that is simultaneously provided with at least one primary winding and at least two secondary windings; and air gap slurry is provided between the multiple coils of the second dielectric layer, so that the ceramic planar transformer has a compact and reasonable structure.

[0028] In some embodiments of the present application, the magnetic core includes but is not limited to an alloy powder core rod, a magnesium-zinc magnetic rod, a nickel-zinc magnetic rod, and a manganese-zinc magnetic rod.

[0029] In some embodiments of the present application, a manganese zinc rod is set as a magnetic core. The manganese zinc rod can provide a low-resistance magnetic channel for the magnetic flux of the coil assembly, thereby improving the coupling coefficient between the primary winding and the secondary winding in the coil assembly.

[0030] In some embodiments of the present application, the ceramic planar transformer is manufactured using a low-temperature co-fired ceramic process or a high-temperature co-fired ceramic process.

[0031] An embodiment of the present application provides a power module, comprising the ceramic planar transformer described in any one of the first aspects.

[0032] Other features and advantages disclosed in the present application will be described in the following description, or some features and advantages can be inferred or determined without doubt from the description, or can be learned by implementing the above-mentioned technology disclosed in the present application.

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a ceramic planar transformer provided in an embodiment of the present application;

[0036] Figure 2 Another structural schematic diagram of the ceramic planar transformer provided in an embodiment of the present application;

[0037] Figure 3 Another structural schematic diagram of the ceramic planar transformer provided in an embodiment of the present application;

[0038] Figure 4 Another structural schematic diagram of the ceramic planar transformer provided in an embodiment of the present application;

[0039] Figure 5 A schematic cross-sectional view of a ceramic planar transformer according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0041] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0043] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0044] The terms "first," "second," and the like in the description, embodiments, claims, and drawings of this application are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance or order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, inclusion of a series of steps or units. A method, system, product, or apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0046] According to the structural type, high-frequency transformers can be divided into wound transformers and planar transformers. The following is an introduction to wound transformers and planar transformers respectively:

[0047] (1) A wound transformer consists of a bobbin, a coil, and a magnetic core. The coil is wound on the bobbin, and the coil and the magnetic core can be assembled together. Wound transformers have advantages such as low cost and low DC resistance of the winding. However, wound transformers also have disadvantages such as low processing efficiency, poor performance consistency, and relatively large size.

[0048] (2) Planar transformers can be divided into printed circuit board (PCB) planar transformers (also called PCB planar transformers) and co-fired magnetic ceramic planar transformers.

[0049] PCB planar transformers can include a pre-assembled printed circuit board (with primary and secondary windings) and a magnetic core (which can adopt an E-type or RM-type structure). PCB planar transformers have the advantages of low height, small size, rapid mass production, and consistent performance.

[0050] Among them, co-fired magnetic ceramic planar transformers can generally include low temperature co-fired ceramics planar transformers (which can be called LTCC planar transformers) and high temperature co-fired ceramics planar transformers (which can be called HTCC planar transformers).

[0051] LTCC planar transformers typically consist of a multilayer magnetic ceramic substrate with printed primary and secondary windings. These multilayer ceramic substrates are laminated and sintered at a temperature below 950°C. Because the magnetic ceramic substrates themselves have a certain relative permeability, LTCC planar transformers do not require an additional magnetic core. The laminated and sintered ceramic substrates function as high-frequency transformers. Consequently, compared to PCB planar transformers, LTCC planar transformers are shorter and smaller in size.

[0052] At the same time, since the magnetic ceramic substrate between the primary winding and the secondary winding in the LTCC planar transformer has a certain relative magnetic permeability, when the transformer is working, the magnetic flux generated by the primary winding will pass through the magnetic ceramic substrate between the primary winding and the secondary winding, resulting in the magnetic flux generated by the primary winding not being coupled by the secondary winding, and the leakage magnetic flux of the primary winding is large. Therefore, the LTCC planar transformer has the problem of large leakage inductance.

[0053] In order to solve the technical problems of large leakage inductance and low coupling coefficient between primary winding and secondary winding in existing ceramic planar transformers, the present application provides a ceramic planar transformer and a power module.

[0054] See also Figure 1 , the present application provides a ceramic planar transformer, including: The embodiment of the present application provides a ceramic planar transformer, including: a dielectric component 1;

[0055] A coil assembly 2 is provided on the dielectric assembly 1, wherein the coil assembly 2 includes a plurality of coils, and the plurality of coils include: at least one primary winding 21 and at least two secondary windings 22;

[0056] The at least two secondary windings 22 are arranged on both sides of the primary winding 21;

[0057] An air gap slurry 3 is provided between the multiple coils of the coil assembly 2;

[0058] The relative magnetic permeability of the dielectric component 1 is higher than the relative magnetic permeability of the air gap slurry 3 .

[0059] In some embodiments, the plurality of coils of the coil assembly may be circular, square, or other shapes.

[0060] In some embodiments, there may be multiple primary windings 21 .

[0061] In some embodiments, at least two secondary windings 22 means that the coil assembly 2 has two secondary windings 22 or the coil assembly 2 has more than two secondary windings 22 .

[0062] In some embodiments, the provision of air gap paste 3 between the plurality of coils refers to the provision of air gap paste between the primary winding 21 and the secondary winding 22 .

[0063] In some embodiments, the provision of air gap paste 3 between the plurality of coils refers to the provision of air gap paste between the secondary windings 22 .

[0064] In some embodiments, air gap paste is provided between the plurality of coils, which means that air gap paste is provided between all coils (including all primary windings 21 and all secondary windings 22 ) of the coil assembly.

[0065] In some embodiments, relative permeability is an electrical term that refers to the ratio of the magnetic permeability of a particular medium to the magnetic permeability μ0 of a vacuum.

[0066] That is, the magnetic permeability μ of the dielectric component 1 is r1 The relative magnetic permeability is greater than that of the air gap slurry 3 μ r2 Magnetic permeability.

[0067] That is, the magnetic permeabilities μ1 and μ 0 The ratio is greater than the air gap slurry 3μ2 and μ 0 ratio.

[0068] Therefore, the dielectric component 1 can be called a medium with high magnetic permeability, and the air gap slurry 3 can be called a medium with low magnetic permeability.

[0069] Specifically, see Figure 1 , Figure 1 The dielectric component 1 has a layer, and a coil component 2 is arranged on the dielectric component 1. The coil component 2 includes: two secondary windings 22 and a primary winding 21; the two secondary windings 22 are respectively arranged on both sides of the primary winding 21, and the gap between the primary winding 21 and the secondary winding 22 is filled with an air gap slurry 3.

[0070] In some embodiments of the present application, at least two secondary windings 22 are arranged on both sides of the primary winding 21, and air gap slurry 3 is filled between the multiple coils. The relative magnetic permeability of the dielectric component 1 is higher than the relative magnetic permeability of the air gap slurry 3. The air gap slurry 3 can prevent the self-coupling of the magnetic flux in the coil component 2 to a certain extent, thereby forcing the magnetic flux of the primary winding 21 to pass through the secondary winding 22 as much as possible, thereby improving the coupling coefficient between the primary winding 21 and the secondary winding 22.

[0071] In some embodiments of the present application, the ratio of the relative magnetic permeability of the dielectric component 1 to the relative magnetic permeability of the air gap slurry 3 is greater than 10.

[0072] In some embodiments of the present application, by making the ratio of the relative magnetic permeability of the dielectric component 1 to the relative magnetic permeability of the air gap slurry 3 greater than 10, the ability of the air gap slurry 3 to prevent the self-coupling of the magnetic flux of the coil assembly 2 is improved, and the magnetic flux of the primary winding 21 is forced to pass through the secondary winding 22 as much as possible, thereby improving the coupling coefficient between the primary winding 21 and the secondary winding 22.

[0073] In some embodiments of the present application, the relative magnetic permeability of the dielectric component 1 is greater than 50.

[0074] In some embodiments of the present application, the relative magnetic permeability of the dielectric component 1 is greater than 50, thereby improving the ability of the air gap slurry 3 to prevent the self-coupling of the magnetic flux of the coil component 2, forcing the magnetic flux of the primary winding 21 to pass through the secondary winding 22 as much as possible, thereby improving the coupling coefficient between the primary winding 21 and the secondary winding 22.

[0075] In some embodiments of the present application, the relative magnetic permeability of the air gap slurry 3 is less than 5.

[0076] In some embodiments of the present application, the relative magnetic permeability of the air gap paste 3 is less than 5, thereby improving the ability of the air gap paste 3 to prevent the self-coupling of the magnetic flux of the coil assembly 2, forcing the magnetic flux of the primary winding 21 to pass through the secondary winding 22 as much as possible, thereby improving the coupling coefficient between the primary winding 21 and the secondary winding 22.

[0077] In some embodiments of the present application, a through hole 4 is provided in the middle region of the coil assembly 2 , a magnetic core is provided in the through hole 4 , and the relative magnetic permeability of the magnetic core is greater than the relative magnetic permeability of the dielectric assembly 1 .

[0078] The magnetic core may be a solid rod; or it may be formed by injecting magnetic slurry into the through hole 4 and solidifying the magnetic slurry.

[0079] In some embodiments of the present application, a through hole 4 is provided in the central area of ​​the coil assembly 2, and a magnetic core is provided in the through hole 4, and the relative magnetic permeability of the magnetic core is greater than the relative magnetic permeability of the dielectric assembly 1, so that the magnetic core can provide a low-resistance magnetic channel when the coil assembly 2 is working, further improving the coupling coefficient of the primary winding 21 and the secondary winding 22 in the coil assembly 2.

[0080] For example, see Figure 2 A coil assembly 2 is provided on the dielectric assembly 1. The coil assembly 2 includes a primary winding 21 and two secondary windings 22. An air gap slurry 3 is filled between the primary winding 21 and the secondary winding 22. A through hole 4 is provided between the primary winding 21 and the secondary winding 22.

[0081] For example, see Figure 3A coil assembly 2 is provided on the dielectric assembly 1. The coil assembly 2 includes a primary winding 21 and two secondary windings 22. An air gap paste 3 is filled between the primary winding 21 and the secondary winding 22. A through hole 4 is provided between the primary winding 21 and the secondary winding 22, and is also filled with the air gap paste 3.

[0082] In some embodiments of the present application, the through hole 4 is provided in the area surrounded by the innermost secondary winding 22 of the coil assembly 2 .

[0083] For example, see Figure 4 A coil assembly 2 is mounted on dielectric assembly 1. Coil assembly 2 includes a primary winding 21 and two secondary windings 22. The space between primary winding 21 and secondary winding 22 is filled with air gap slurry 3. The multiple coils in coil assembly 2 are nested. The area enclosed by the central coil is provided with a through hole 4, within which a magnetic core is located.

[0084] In some embodiments, the number of through holes 4 may be greater than one.

[0085] In some embodiments, the through hole 4 passes through the entire dielectric component 1 .

[0086] Some embodiments of the present application arrange the through hole 4 in the area surrounded by the innermost secondary winding 22 in the coil assembly 2, so that the magnetic core in the through hole 4 can provide a low-resistance magnetic channel for the magnetic flux of the coil assembly, thereby improving the coupling coefficient between the primary winding and the secondary winding in the coil assembly.

[0087] In some embodiments of the present application, the dielectric component 1 includes: multiple layers of first dielectric layers 11; the multiple layers of first dielectric layers 11 are stacked; at least one first dielectric layer 11 in the multiple layers of first dielectric layers 11 is simultaneously provided with at least one primary winding 21 and at least two secondary windings 22; at least one second dielectric layer exists in at least one first dielectric layer 11 that is simultaneously provided with at least one primary winding 21 and at least two secondary windings 22; the air gap slurry is provided between multiple coils of the second dielectric layer.

[0088] In some embodiments, when the dielectric component 1 includes multiple first dielectric layers 11 , the uppermost first dielectric layer 11 and the lowermost first dielectric layer 11 are not provided with the coil assembly 2 .

[0089] For example, see Figure 5The dielectric component 1 includes three first dielectric layers 11, each of which is provided with a primary winding 21 and two secondary windings 22. The two secondary windings 22 on each second dielectric layer are arranged on both sides of the primary winding 21, and an air gap slurry 3 is provided between the multiple coils on each second dielectric layer. That is, the three first dielectric layers 11 here can all be the second dielectric layers 12.

[0090] In some embodiments, different first dielectric layers 11 may have the same number of primary windings 21 and / or secondary windings 22 , or may have different numbers of primary windings 21 and / or secondary windings 22 .

[0091] In some embodiments, buried vias are provided on the first dielectric layer, and conductive paste (such as silver paste) is provided in the buried vias. The outermost secondary windings 22 on different first dielectric layers are connected to form a secondary winding 22 as a whole through the conductive paste.

[0092] In some embodiments, blind holes are provided on the first dielectric layer, and conductive paste is provided on the blind holes. The innermost secondary windings 22 on different first dielectric layers are connected to form a secondary winding 22 as a whole through the conductive paste.

[0093] In some embodiments, blind holes are provided on the first dielectric layer, and conductive paste is provided on the blind holes. The primary windings 21 on different first dielectric layers are connected to form a primary winding 21 as a whole through the conductive paste.

[0094] In some embodiments, blind holes are provided on the first dielectric layer 11 , and conductive paste is provided on the blind holes. The secondary windings 22 on different first dielectric layers 11 are connected to form a secondary winding 22 as a whole through the conductive paste.

[0095] It should be understood that the primary windings 21 and the secondary windings 22 on different first dielectric layers 11 may also have different connection modes, which is not limited in this embodiment.

[0096] In some embodiments of the present application, multiple first dielectric layers 11 are provided. The multiple first dielectric layers 11 are stacked to form a dielectric component 1, and different sub-coils are provided on different first dielectric layers 11, so that the ceramic planar transformer has a compact and reasonable structure.

[0097] In some embodiments of the present application, the magnetic core is a manganese zinc rod.

[0098] In some embodiments, the magnetic core can also be made of other materials with high magnetic permeability, such as nickel-zinc ferrite, nickel-zinc-copper ferrite, manganese-zinc ferrite or metal powder magnetic film, nickel-zinc ferrite, nickel-zinc-copper ferrite, manganese-zinc ferrite, etc.

[0099] The magnetic cores of some embodiments of the present application include, but are not limited to, alloy powder core rods, magnesium-zinc magnetic rods, nickel-zinc magnetic rods, and manganese-zinc rods.

[0100] Alloy powder core rods, magnesium-zinc magnetic rods, nickel-zinc magnetic rods, and manganese-zinc rods can provide a low-resistance magnetic channel for the magnetic flux of coil assembly 2, thereby improving the coupling coefficient between the primary winding 21 and the secondary winding 22 in coil assembly 2. This embodiment of the present application provides a first simulation example, simulating a ceramic planar transformer. The ceramic planar transformer includes: a dielectric component 1 comprising multiple first dielectric layers 11; a coil component 2 disposed on each first dielectric layer 11, the coil component 2 comprising: a primary winding 21 and at least two secondary windings 22; the at least two secondary windings 22 disposed on either side of the primary winding 21; an air gap slurry 3 filled between the primary winding 21 and the secondary winding 22; the relative permeability of the dielectric component 1 is higher than the relative permeability of the air gap slurry 3. The simulation structure shows that the coupling coefficient can reach above 0.97.

[0101] This embodiment provides a second simulation example. Based on the ceramic planar transformer of the first simulation example, a through hole 4 is provided in the central region of the ceramic planar transformer (i.e., the area surrounded by the innermost coil in the coil assembly). A manganese-zinc rod is placed within the through hole. This further improves the coupling coefficient obtained in the first simulation example by more than 5%. Specific comparison data is shown in the table below. (The coupling coefficient can also be further improved by winding optimization under the same conditions to achieve higher values.)

[0102] In some embodiments of the present application, the ceramic planar transformer is manufactured using a low-temperature co-fired ceramics (LTCC) process (i.e., LTCC process) or a high-temperature co-fired ceramics (HTCC) process (i.e., HTCC process). Of course, other sintering processes can also be used, and the embodiments of the present application are not limited to this.

[0103] An embodiment of the present application further provides a power module, comprising the ceramic planar transformer described in the above embodiment.

[0104] The ceramic planar transformer is used as a substrate carrier, and a soldering pad is provided on the ceramic planar transformer, and the semiconductor device can be soldered on the soldering pad.

[0105] In some embodiments, the semiconductor device may be a chip, a resistor, or a capacitor, which is not limited in this embodiment.

[0106] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0107] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0108] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A ceramic planar transformer, characterized in that: include: media components; A coil assembly is provided on the dielectric assembly, the coil assembly comprising a plurality of coils, the plurality of coils comprising: at least one primary winding and at least two secondary windings; The at least two secondary windings are arranged on both sides of the primary winding; An air gap slurry is provided between the plurality of coils of the coil assembly; The relative magnetic permeability of the dielectric component is higher than the relative magnetic permeability of the air gap slurry; A through hole is provided in the middle area of ​​the coil assembly, a magnetic core is provided in the through hole, and the relative magnetic permeability of the magnetic core is greater than the relative magnetic permeability of the dielectric assembly; The through hole is provided in the area surrounded by the innermost secondary winding of the coil assembly; The dielectric component includes: multiple first dielectric layers; The multiple first dielectric layers are stacked; At least one of the multiple first dielectric layers is provided with at least one primary winding and at least two secondary windings; At least one second dielectric layer is provided in at least one first dielectric layer of at least one primary winding and at least two secondary windings; The air gap slurry is provided between the plurality of coils in the second dielectric layer; A third dielectric layer is provided above and below the first dielectric layer, and the relative magnetic permeability of the third dielectric layer is higher than that of the first dielectric layer.

2. The ceramic planar transformer according to claim 1, wherein: The ratio of the relative magnetic permeability of the dielectric component to the relative magnetic permeability of the air gap slurry is greater than 10.

3. The ceramic planar transformer according to claim 1, wherein: The relative magnetic permeability of the dielectric component is greater than 50.

4. The ceramic planar transformer according to claim 1, wherein: The relative magnetic permeability of the air gap slurry is less than 5.

5. The ceramic planar transformer according to claim 1, wherein: The magnetic core includes but is not limited to alloy powder core rods, magnesium zinc magnetic rods, nickel zinc magnetic rods, and manganese zinc rods.

6. The ceramic planar transformer according to any one of claims 1 to 5, characterized in that: The ceramic planar transformer is manufactured by adopting a low-temperature co-fired ceramic process or a high-temperature co-fired ceramic process.

7. A power module, characterized in that: The power module includes: the ceramic planar transformer according to any one of claims 1 to 5.

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