Power module

Abstract

The present invention provides a power module, which includes a printed circuit board, a magnetic component, a secondary side switching circuit group, and at least two sets of external terminals. The printed circuit board includes a first surface and a second surface; the magnetic component is disposed on the printed circuit board and includes two primary side winding groups and a plurality of secondary side winding groups; the secondary side switching circuit group includes a plurality of second switching units, each second switching unit is electrically connected to a corresponding secondary side winding group and includes a plurality of switching elements connected in parallel, two switching elements are respectively disposed on the first surface and the second surface, and the switching elements of each second switching unit disposed on the first surface at least partially overlap with the switching elements of the same second switching unit disposed on the second surface in a projection perpendicular to the second surface; at least two sets of external terminals for large current are disposed on the second surface and are respectively electrically connected to the plurality of second switching units.

Description

Technical Field

[0001] The present invention relates to a power module, and particularly to a power module that can be applied in high-current situations, improve power conversion efficiency, reduce size and increase power density. Background Art

[0002] In existing power modules, magnetic components are usually used to form, for example, transformers or inductors. The magnetic components generally use a U-shaped magnetic core including two winding posts. Taking a transformer as an example, a primary winding group and a secondary winding group are wound on each winding post of the U-shaped magnetic core. The two primary winding groups or the two secondary winding groups on the two winding posts can be connected in parallel or in series to meet the demand for high-power output.

[0003] However, the U-shaped magnetic core also causes the corresponding magnetic components to be unable to effectively reduce in size, such as thickness and / or width, etc., resulting in a larger size of the power module using the magnetic components, and at the same time causing a decrease in the power density of the power module.

[0004] Furthermore, in a power module, high-current output is usually adopted to improve output efficiency. However, in existing power modules, due to the arrangement positions of circuit components, high current cannot be effectively and evenly distributed inside the printed circuit board of the power module, so the power conversion efficiency of the power module cannot be improved. Summary of the Invention

[0005] An object of the present invention is to provide a power module to solve the defect that traditional power modules cannot effectively and evenly distribute high current inside the printed circuit board of the power module, resulting in the inability to improve the power conversion efficiency of the power module.

[0006] Another object of the present invention is to provide a power module that can reduce its own size and increase its own power density.

[0007] To achieve the above object, an embodiment of the present invention provides a power module, which includes a printed circuit board having a first surface and a second surface; a magnetic component disposed on the printed circuit board and including at least one primary winding group and a plurality of secondary winding groups; a secondary-side switching circuit group including a plurality of second switching units, each second switching unit being electrically connected to a corresponding secondary winding group, and each switching unit including a plurality of switching elements connected in parallel. The plurality of switching elements of each switching unit are evenly placed on the first surface and the second surface of the printed circuit board in the same number. Some of the switching elements of each switching unit are disposed on the first surface, and the remaining switching elements of each switching unit are disposed on the second surface. The switching elements of each second switching unit disposed on the first surface at least partially overlap the switching elements of the same second switching unit disposed on the second surface in the projection perpendicular to the second surface; and at least two sets of external terminals for large current, the at least two sets of external terminals are disposed on the second surface and are respectively electrically connected to the plurality of second switching units, wherein the at least two sets of external terminals are located on one side of the secondary-side switching group, and the secondary-side switching group is located between the magnetic component and the two sets of external terminals.

[0008] To achieve the above object, an embodiment of the present invention provides a power module, which includes a printed circuit board having a first surface and a second surface; a magnetic component disposed on the printed circuit board, including at least two winding columns, at least two side columns, two connecting portions and at least two sets of winding groups, wherein the two connecting portions are used to connect the at least two winding columns and the at least two side columns, the at least two winding columns are disposed between the at least two side columns, and at least two sets of the winding groups are respectively wound around the at least two winding columns, and the AC magnetic flux directions on two adjacent winding columns are opposite; and a plurality of switching units disposed on the printed circuit board and respectively electrically connected to the at least two sets of winding groups; wherein the thickness of any one of the two connecting portions of the magnetic component is any value between 0.5 and 1.5 times the maximum value of the thickness of the plurality of switching units.

[0009] The beneficial effect of the present invention is that the present invention is a power module. Among them, an even number of switching elements of each second switching unit of the secondary-side switching circuit group of the power module are evenly arranged on the first surface and the second surface of the printed circuit board, so that the current flowing through the secondary winding group electrically connected to the second switching unit is evenly distributed inside the printed circuit board, thus improving the power conversion efficiency of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of the magnetic core of the magnetic component of the preferred embodiment of the present invention;

[0011] Figure 2 For use Figure 1 The circuit block diagram of an exemplary power module using the magnetic core;

[0012] Figure 3 For Figure 2 the two primary side winding groups of the power supply module shown are wound around Figure 1 the magnetic core shown to form a schematic structural diagram of the magnetic component of the preferred embodiment of the present invention;

[0013] Figure 4 For Figure 2 the four secondary side winding groups of the power supply module shown are wound around Figure 1 the magnetic core shown to form a schematic structural diagram of the magnetic component of the preferred embodiment of the present invention;

[0014] Figure 5 For Figure 2 a schematic perspective combined structure diagram of the preferred embodiment of the power supply module shown;

[0015] Figure 6 For Figure 5 a schematic perspective combined structure diagram of the reverse view of the power supply module shown;

[0016] Figure 7 For Figure 5 a schematic perspective exploded structure diagram of the power supply module shown;

[0017] Figure 8 For Figure 7 a schematic perspective exploded structure diagram of the reverse view of the power supply module shown;

[0018] Figure 9 For Figure 5 a partial cross-sectional top view schematic diagram when the power supply module shown is sectioned along the E-E' direction;

[0019] Figure 10 For Figure 6 a comparison schematic diagram of the top view structure of the power supply module shown and the top cross-sectional structure inside the magnetic component.

[0020] The reference numerals are as follows:

[0021] 20: Magnetic component

[0022] 21: Power supply module

[0023] 200: Magnetic core

[0024] 211: First winding post

[0025] 212: Second winding post

[0026] 213: First side post

[0027] 214: Second side post

[0028] 215: First connecting portion

[0029] 216: Second connection part

[0030] D1: Linear direction

[0031] 217: Air gap

[0032] 200a: First magnetic core unit

[0033] 200b: Second magnetic core unit

[0034] Lin: Inductance

[0035] C1: First capacitor

[0036] 218: Primary side switch circuit group

[0037] T: Transformer

[0038] 219: Secondary side switch circuit group

[0039] C2: Second capacitor

[0040] V1+: First positive terminal

[0041] V1-: First negative terminal

[0042] V2+: Second positive terminal

[0043] V2-: Second negative terminal

[0044] S21, S22, Sr21, Sr22: First switch unit

[0045] W1: First primary side winding group

[0046] W2: Second primary side winding group

[0047] W3: First secondary side winding group

[0048] W4: Second secondary side winding group

[0049] W5: Third secondary side winding group

[0050] W6: Fourth secondary side winding group

[0051] S23, S24, S25, S26: Second switch unit

[0052] A: First connection point

[0053] A’: Second connection point

[0054] 300: Printed circuit board

[0055] 301: First side

[0056] 302: Second side

[0057] 304: First side wall

[0058] 303: Second side wall

[0059] 313: Switching element

[0060] 311, 311a, 311b: First metal block

[0061] 312: Second metal block

[0062] 300a: First through hole

[0063] 300b: Second through hole

[0064] H0, H1, H2: Distance

[0065] WD1, WD2: Width

[0066] 314: High-current side capacitor Detailed implementation manners

[0067] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different ways, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are for illustrative purposes in essence and not intended to limit the present invention.

[0068] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , wherein Figure 1 is a schematic structural diagram of the magnetic core of the magnetic component according to a preferred embodiment of the present invention, Figure 2 is for use Figure 1 of a schematic circuit block diagram of an exemplary power module with the magnetic core, Figure 3 is Figure 2 shown in the power module of two primary side winding groups wound around Figure 1 shown in the magnetic core to form a schematic structural diagram of the magnetic component according to a preferred embodiment of the present invention, Figure 4 is Figure 2 shown in the power module of four secondary side winding groups wound around Figure 1 shown in the magnetic core to form a schematic structural diagram of the magnetic component according to a preferred embodiment of the present invention. As Figures 1 to 4 shown, the magnetic component 20 of the present invention is applied to a power module, such as Figure 2In the power supply module 21 shown. The magnetic component 20 includes a magnetic core 200 and windings wound around the magnetic core (not drawn for the moment). The magnetic core 200 includes a first winding column 211, a second winding column 212, a first side column 213, a second side column 214, a first connecting portion 215, and a second connecting portion 216. The first connecting portion 215 and the second connecting portion 216 connect the first winding column 211, the second winding column 212, the first side column 213, and the second side column 214. The first side column 213 and the second side column 214 are disposed between the first connecting portion 215 and the second connecting portion 216, and are respectively disposed on both sides of the first connecting portion 215 and the second connecting portion 216. The first winding column 211 and the second winding column 212 are disposed between the first side column 213 and the second side column 214, and are separated from the first side column 213 and the second side column 214 by a set spacing. And as Figure 1 shown in the front view of the magnetic core 200, wherein the first connecting portion 215 (or the second connecting portion 216) has a length L, a width WD1 (as Figure 5 ), and a height H. A set direct current direction D1 is defined as the direction along the long side L of the magnetic core 200. As Figure 1 shown, the first side column 213, the first winding column 211, the second winding column 212, and the second side column 214 are arranged in a straight line direction D1. The following embodiments are described by taking the first connecting portion 215 and the second connecting portion 216 having the same height as an example, but it is not limited thereto, and the height of any connecting portion can be changed according to requirements.

[0069] In the above embodiment, the cross-sectional area of the first winding column 211 perpendicular to the height direction H is substantially equal to the cross-sectional area of the second winding column 212 perpendicular to the height direction H (substantially equal does not mean absolutely equal. In the production process, due to the existence of errors, the difference between the two can be defined as substantially equal when the ratio of the difference between the two to the difference between any one of them is less than 10%. The following substantial equality is defined in this way.). The cross-sectional area of the first side column 213 perpendicular to the height direction H and the cross-sectional area of the second side column 214 perpendicular to the height direction H are also substantially equal.

[0070] In addition, in this embodiment, the first winding column 211 and the second winding column 212 may respectively include air gaps 217, and the first side column 213 and the second side column 214 may not include air gaps; in another embodiment, the first winding column 211 and the second winding column 212 may respectively include air gaps 217, and the first side column 213 and the second side column 214 may also include air gaps, and the size of the air gaps on the side columns is not limited, and needs to be designed according to actual requirements. In other embodiments, when the implementation mode of the power supply module to which the magnetic component 20 is applied does not require exciting current, the first winding column 211 and the second winding column 212 may also not include air gaps.

[0071] In other embodiments, the magnetic core 200 may include an independent first magnetic core unit 200a and a second magnetic core unit 200b. The first magnetic core unit 200a includes a first connection portion 215, and the second magnetic core unit 200b includes a second connection portion 216. The first winding column 211, the second winding column 212, the first side column 213, and the second side column 214 are jointly formed by a part of the first magnetic core unit 200a and a part of the second magnetic core unit 200b. However, in other embodiments, the first winding column 211, the second winding column 212, the first side column 213, and the second side column 214 may be formed by only a single magnetic core unit among the first magnetic core unit 200a and the second magnetic core unit 200b, and the other magnetic core unit among the first magnetic core unit 200a and the second magnetic core unit 200b has a structure similar to that of an I-shaped magnetic core.

[0072] Please refer to Figure 2 , the power module 21 has a first end, a second end, an inductor Lin, a first capacitor C1, a primary side switch circuit group 218, a transformer T, a secondary side switch circuit group 219, and a second capacitor C2. One of the first end and the second end may be an input end or an output end. The first end includes a first positive terminal V1+ and a first negative terminal V1-, and the second end includes a second positive terminal V2+ and a second negative terminal V2-. In the present invention, the second end is taken as the output end and the first end is taken as the input end for illustration. The inductor Lin is serially electrically connected to the first positive terminal V1+. The first capacitor C1 is electrically connected between the inductor Lin and the first negative terminal V1-. The primary side switch circuit group 218 is electrically connected in parallel with the first capacitor C1 and has a full-bridge circuit structure and includes four first switch units S21, S22, Sr21, Sr22. The first switch unit S21 and the first switch unit Sr21 are serially connected to form a first bridge arm, and the first switch unit S22 and the first switch unit Sr22 are serially connected to form a second bridge arm. The transformer T may include, but is not limited to, Figure 1The magnetic core 200 shown, and the transformer T further includes a first primary winding group W1, a second primary winding group W2, a first secondary winding group, and a second secondary winding group. The first primary winding group W1 and the second primary winding group W2 are connected in series between the midpoints of the first bridge arm and the second bridge arm, and have the same number of turns, for example, but not limited to, three turns, and the first primary winding group W1 and the second primary winding group W2 can be, but not limited to, planar printed circuit board winding groups. The first secondary winding group and the second secondary winding group are magnetically coupled to the first primary winding group W1 and the second primary winding group W2 through the magnetic core 200, and the number of turns of the first secondary winding group is equal to the number of turns of the second secondary winding group, wherein the first secondary winding group includes a first secondary winding group W3 and a second secondary winding group W4 with a center tap structure, the second secondary winding group is connected in parallel with the first secondary winding group, and includes a third secondary winding group W5 and a fourth secondary winding group W6 with a center tap structure. The secondary side switch circuit group 219 is electrically connected to the first secondary winding group, the second secondary winding group, the second positive terminal V2+ and the second negative terminal V2-, and includes four second switch units S23, S24, S25, S26, wherein the second switch unit S23 is electrically connected in series with the first secondary winding group W3, the second switch unit S24 is electrically connected in series with the second secondary winding group W4, the second switch unit S25 is electrically connected in series with the third secondary winding group W5, and the second switch unit S26 is electrically connected in series with the fourth secondary winding group W6. The second capacitor C2 is electrically connected between the second positive terminal V2+ and the second negative terminal V2-. In some embodiments, since the second secondary winding group is connected in parallel with the first secondary winding group, and the secondary side switch circuit group 219 is electrically connected to the first secondary winding group, the second secondary winding group, the second positive terminal V2+ and the second negative terminal V2-, the power supply module 21 is actually a dual-path parallel connection on the secondary side of the transformer T.

[0073] In the above embodiments, when the power supply module 21 is applied to occasions with large current output, in order to improve the current-carrying capacity of the switch units, the first switch units S21, S22, Sr21, Sr22 or the second switch units S23, S24, S25, S26 can be respectively constituted by an even number of switch elements (not shown in this figure) connected in parallel, for example, two connected in parallel, and in the embodiments of the present invention, the second switch units S23, S24, S25, S26 respectively include two switch elements connected in parallel.

[0074] When the transformer T uses Figure 1 the magnetic core 200 shown, then the winding method of the first primary winding group W1 and the second primary winding group W2 can be, for example Figure 3 ( Figure 3As shown by the omission of the first secondary winding group and the second secondary winding group), that is, the first primary winding group W1 is wound around the first winding column 211, and the second primary winding group W2 is wound around the second winding column 212. The voltage signals at both ends of the first primary winding group W1 and the second primary winding group W2 are AC voltage signals, and the AC magnetic flux generated by the first primary winding group W1 on the first winding column 211 (such as Figure 3 the AC magnetic flux shown by the solid line B) is opposite in direction to the AC magnetic flux generated by the second primary winding group W2 on the second winding column 212 (such as Figure 3 the AC magnetic flux shown by the dashed line C).

[0075] In order to achieve that the direction of the AC magnetic flux generated by the first primary winding group W1 on the first winding column 211 is opposite to the direction of the AC magnetic flux generated by the second primary winding group W2 on the second winding column 212, in this embodiment, the winding direction of the first primary winding group W1 on the first winding column 211 is opposite to the winding direction of the second primary winding group W2 on the second winding column 212. For example Figure 3 as shown, the first primary winding group W1 is wound counterclockwise around the first winding column 211, while the second primary winding group W2 is wound clockwise around the second winding column 212. However, this is not a limitation. As long as the effect that the direction of the AC magnetic flux generated by the first primary winding group W1 on the first winding column 211 is opposite to the direction of the AC magnetic flux generated by the second primary winding group W2 on the second winding column 212 can be achieved. For example, when the voltage at both ends of the first primary winding group W1 and the voltage at both ends of the second primary winding group W2 are out of phase by 180 degrees, the winding direction of the first primary winding group W1 on the first winding column 211 can be the same as the winding direction of the second primary winding group W2 on the second winding column 212.

[0076] As can be seen from the above, since the second winding column 212 is provided with an air gap 217, while the first side column 213 and the second side column 214 are not provided with air gaps, or even if the first side column 213 or the second side column 214 has air gaps, the heights of the air gaps of the first side column 213 and the second side column 214 are respectively less than 1 / 10 of the height of the air gap 217 of the second winding column 212. Therefore, the equivalent magnetic resistance on the first winding column 211 is greater than the equivalent magnetic resistances on the first side column 213 and the second side column 214, causing most of the alternating magnetic flux (alternating magnetic flux B) generated by the second primary winding group W2 to flow through the first side column 213 and the second side column 214 after passing through the second winding column 212 to form a closed magnetic circuit; similarly, because the first winding column 211 is provided with an air gap 217, the equivalent magnetic resistance on the second winding column 212 is greater than the equivalent magnetic resistances on the first side column 213 and the second side column 214, causing most of the alternating magnetic flux (alternating magnetic flux C) generated by the first primary winding group W1 to flow through the first side column 213 and the second side column 214 after passing through the first winding column 211 to form a closed magnetic circuit. The alternating magnetic flux generated by the first primary winding group W1 on the first winding column 211 and the alternating magnetic flux generated by the second primary winding group W2 on the second winding column 212 both flow through the first connecting portion 215 and the second connecting portion 216. Therefore, the first connecting portion 215 or the second connecting portion 216 can be divided into three segments according to the magnitude of the alternating magnetic flux borne. Taking the first connecting portion 215 as an example, the first connecting portion 215 can be divided into three segments. The first segment corresponds to the region between the first side column 213 and the first winding column 211, the second segment corresponds to the region between the first winding column 211 and the second winding column 212, and the third segment corresponds to the region between the second side column 214 and the second winding column 212. Refer to Figure 3 , in the second segment of the first connecting portion 215, the alternating magnetic flux generated by the first primary winding group W1 is superimposed on the alternating magnetic flux generated by the second primary winding group W2; while in the first and third segments of the first connecting portion 215, the alternating magnetic flux generated by the first primary winding group W1 cancels out the alternating magnetic flux generated by the second primary winding group W2. The analysis of the second connecting portion 216 is the same as that of the first connecting portion 215 and will not be elaborated here. It should be noted that magnetic flux cancellation does not mean that the final magnetic flux is zero, as long as the final magnetic flux is less than 20% of the magnetic flux in any original direction. The rule regarding magnetic flux cancellation also applies in the subsequent description.

[0077] In this way, compared with the AC magnetic flux on the connecting portion between the two winding columns of the U-shaped magnetic core, the AC magnetic flux on the first and third segments of the first connecting portion 215 and the second connecting portion 216 of the magnetic component 20 of the present invention will become smaller, so that the cross-sectional areas of the first connecting portion 215 and the second connecting portion 216 perpendicular to the long side direction L can be reduced. Therefore, the width WD1 of the first connecting portion 215 and the second connecting portion 216 can be reduced, or the height H of the first connecting portion 215 and the second connecting portion 216 can be reduced, or the width WD1 and the height H of the first connecting portion 215 and the second connecting portion 216 can be reduced simultaneously. In this way, the size of the magnetic component 20, such as the thickness, can be reduced, and correspondingly, the size of the power module 21 using the magnetic component 20, such as the thickness, can also be reduced.

[0078] In the above embodiment, when the cross-sectional areas of the first connecting portion 215 and the second connecting portion 216 perpendicular to the long side direction L become smaller, preferably, the cross-sectional areas of the first connecting portion 215 and the second connecting portion 216 perpendicular to the long side direction L are less than or equal to 75% of the cross-sectional area of any one of the first winding column 211 and the second winding column 212 perpendicular to the height direction. In addition, since on the first side column 213 and the second side column 214, the AC magnetic flux generated by the first primary winding group W1 cancels out the AC magnetic flux generated by the second primary winding group W2, the cross-sectional areas of the first side column 213 and the second side column 214 perpendicular to the height direction can be less than or equal to 75% of the cross-sectional area of the first winding column 211 perpendicular to the height direction and less than or equal to 75% of the cross-sectional area of the second winding column 212 perpendicular to the height direction.

[0079] The winding methods of the first secondary winding group and the second secondary winding group can be as Figure 4 shown ( Figure 4 the first primary winding group W1 and the second primary winding group W2 are omitted), that is, the first secondary winding group W3 and the second secondary winding group W4 of the first secondary winding group are wound on the first winding column 211, and the third secondary winding group W5 and the fourth secondary winding group W6 are wound on the second winding column 212. One end of the first secondary winding group W3 and one end of the second secondary winding group W4 are short-circuited at the first connection point A, and one end of the third secondary winding group W5 and one end of the fourth secondary winding group W6 are short-circuited at the second connection point A'. In this embodiment, the winding direction of the first secondary winding group on the first winding column 211 is opposite to the winding direction of the second secondary winding group on the second winding column 212. For example Figure 4As shown, the first secondary winding group W3 and the second secondary winding group W4 of the first group of secondary winding groups can be wound counterclockwise around the first winding post 211, while the third secondary winding group W5 and the fourth secondary winding group W6 of the second group of secondary winding groups are wound clockwise around the second winding post 212. Thus, the direction of the alternating magnetic flux generated by the first group of secondary winding groups on the first winding post 211 is opposite to the direction of the alternating magnetic flux generated by the second group of secondary winding groups on the second winding post 212. Similar to the principle of the effect brought by the alternating magnetic flux generated by the primary winding group on the first and second winding posts, the winding method of this embodiment can further reduce the size of the magnetic component 20 and the size of the power module 21, and increase the power density of the power module 21.

[0080] Similarly, in order to achieve that the direction of the alternating magnetic flux generated by the first group of secondary winding groups on the first winding post 211 is opposite to the direction of the alternating magnetic flux generated by the second group of secondary winding groups on the second winding post 212, a method of applying a voltage phase shift of 180 degrees to the two groups of secondary windings and winding them in the same direction on their respective winding posts can also be adopted, which is not limited here.

[0081] In some embodiments, the first secondary winding group W3 and the second secondary winding group W4 are connected in series to the first connection point A, the third secondary winding group W5 and the fourth secondary winding group W6 are connected in series to the second connection point A', and the first connection point A and the second connection point A' can be electrically connected through the wiring on the printed circuit board included in the power module 21, thus forming the second positive terminal V2+ as shown in Figure 2 In addition, Figure 4 The first secondary winding group W3, the second secondary winding group W4, the third secondary winding group W5, and the fourth secondary winding group W6 shown in the figure are all illustrated with one turn, but this is not limited in actual applications.

[0082] In the above embodiments, the magnetic component is taken as a transformer for illustration, but the actual magnetic component can also be an inductor or an integrated magnetic component composed of a transformer and an inductor. In other embodiments, if it is desired to use Figure 1 the magnetic core 200 shown to achieve the series electrical connection of two inductors, then the one shown in Figure 3The winding methods of the first primary winding group W1 and the second primary winding group W2. At this time, the first primary winding group W1 can form the winding group of one of the inductors, and the second primary winding group W2 can form the winding group of the other inductor. However, in the embodiment where the magnetic core 200 is used to realize the series electrical connection of the two inductors, the terminal voltages at both ends of the first primary winding group W1 and the second primary winding group W2 are respectively changed to DC voltage signals. And because the winding directions of the first primary winding group W1 and the second primary winding group W2 on the first winding post 211 and the second winding post 212 are opposite, the DC magnetic fluxes flowing through the first winding post 211 are opposite to the DC magnetic flux directions flowing through the second winding post 212. And because the first winding post 211 and the second winding post 212 respectively have air gaps 217, the equivalent magnetic resistances on the first winding post 211 and the second winding post 212 are respectively greater than the equivalent magnetic resistance of the first side post 213 and the equivalent magnetic resistance of the second side post 214. Therefore, most of the DC magnetic fluxes generated by the first primary winding group W1 flow through the first side post 213 and the second side post 214 after flowing through the first winding post 211 to form a closed magnetic circuit. Similarly, most of the DC magnetic fluxes generated by the second primary winding group W2 flow through the first side post 213 and the second side post 214 after flowing through the second winding post 212 to form a closed magnetic circuit. Therefore, similar to the aforementioned efficacy principle, the size of the magnetic component 20 and the size of the power module 21 can be further reduced, and the power density of the power module 21 can be increased.

[0083] In some embodiments, if it is desired to use Figure 1 the magnetic core 200 shown to realize the parallel electrical connection of the two inductors, then the winding methods of the first secondary winding group and the second secondary winding group as Figure 4 described can be used. At this time, the first secondary winding group and the second secondary winding group can respectively include a single winding group, and one end of the winding group of the first secondary winding group and one end of the winding group of the second secondary winding group can be electrically connected through the wiring on the printed circuit board included in the power module 21. In this way, the same effect of reducing the size of the magnetic component 20 and the size of the power module 21 and increasing the power density of the power module 21 can be achieved, which will not be elaborated here.

[0084] The following will further illustrate Figure 2 the actual three-dimensional structure of the power module shown. Please refer to Figures 5 - 8 and cooperate with Figure 2 , where Figure 5 is Figure 2 the three-dimensional combined structure schematic diagram of the preferred embodiment of the power module shown, Figure 6 is Figure 5 the three-dimensional combined structure schematic diagram of the reverse view of the power module shown, Figure 7 is Figure 5Schematic diagram of the three-dimensional exploded structure of the power module shown Figure 8 is Figure 7 Schematic diagram of the three-dimensional exploded structure of the reverse view of the power module shown. As Figure 2 、 Figures 5 - 8 shown, in addition to including the first end, the second end, the inductor Lin, the first capacitor C1, the primary side switch circuit group 218, the transformer T, the secondary side switch circuit group 219, and the second capacitor C2 as shown Figure 2 , the power module 21 further includes a printed circuit board 300. The magnetic component constituting the transformer T can be selected as the magnetic component 20 as shown Figure 3 plus Figure 4 shown, thereby achieving the effects of reducing the size of the magnetic component 20 and the size of the power module 21, and increasing the power density of the power module 21. However, the magnetic component is not limited to the magnetic component 20 as shown Figure 3 and Figure 4 shown. Hereinafter, the power module 21 including the magnetic component 20 as shown Figure 2 will also be used for illustrative purposes. And because the magnetic component 20 as shown Figures 2 - 4 is selected in this embodiment, in the region where the first segment of the first connection portion 215 and the second connection portion 216 and the second segment of the second connection portion 216 are located, the alternating magnetic flux generated by the first primary side winding group W1 and the alternating magnetic flux generated by the second primary side winding group W2 are superimposed, and in the region where the second segment and the third segment of the first connection portion 215 and the second connection portion 216 are located, the alternating magnetic flux generated by the first primary side winding group W1 and the alternating magnetic flux generated by the second primary side winding group W2 cancel each other out. Thus, according to the embodiment of the present invention, the width of the first / third segment of the first connection portion 215 is set to be smaller than the width of the second segment of the first connection portion 215, and the width of the first / third segment of the second connection portion 216 is set to be smaller than the width of the second segment of the second connection portion 216. As Figure 5 、 7 、 Figure 8 shown, two notches 220 can be provided on the magnetic cover of the magnetic core 200, which can further reduce the size of the magnetic component, and more components can be placed in the notches 220, thereby further reducing the volume of the power module.

[0085] The printed circuit board 300 includes two opposite first surfaces 301 and second surfaces 302, and first side walls 304 and second side walls 303 that are opposite and are located between the first surface 301 and the second surface 302. The magnetic component 20 is fixedly provided on the printed circuit board 300, and the first side post 213, the first winding post 211, the second winding post 212, and the second side post 214 of the magnetic core 200 of the magnetic component 20 penetrate through the printed circuit board 300 and are at least partially accommodated within the printed circuit board 300, and the linear direction D1 in which the first side post 213, the first winding post 211, the second winding post 212, and the second side post 214 are arranged is parallel to the long sides of the first side wall 304 and the second side wall 303. Therefore, in Figure 5 it is also defined that the long side of the first side wall 304 is the linear direction D1.

[0086] The four first switching units S21, S22, Sr21, and Sr22 of the primary side switching circuit group 218 are arranged on the first surface 301 of the printed circuit board 300 and are adjacent to the second side wall 303, and the four first switching units S21, S22, Sr21, and Sr22 are arranged in a manner parallel to the linear direction D1, where Figure 5 the arrangement order of the four first switching units S21, S22, Sr21, and Sr22 shown is only an example and can be arbitrarily changed according to actual requirements. The four second switching units S23, S24, S25, and S26 are arranged on the first surface 301 of the printed circuit board 300 and are adjacent to the first side wall 304, and the four second switching units S23, S24, S25, and S26 are arranged in a manner parallel to the linear direction D1, where Figure 5 the arrangement order of the four first switching units S21, S22, Sr21, and Sr22 shown is only an example and can be arbitrarily changed according to actual requirements. Moreover, the transformer T is arranged between the four first switching units S21, S22, Sr21, and Sr22 and the four second switching units S23, S24, S25, and S26.

[0087] In this embodiment, both the first end and the second end of the power module 21 can have external terminals, and the external terminals are used to achieve the electrical connection between the power module and the system board. The power module 21 can be applied to high-current application scenarios. In this embodiment, taking the second end as the high-current end as an example, the characteristics of this technical solution will be described in terms of its current layout. In actual applications, the first end can also be the high-current end, and the layout can refer to the use of this technical solution, which will not be elaborated here. As Figure 2The four second switch units S23, S24, S25, and S26 of the secondary side switch circuit group 219 shown can actually each include an even number of switch elements connected in parallel, and the even number of switch elements of each second switch unit are evenly distributed in terms of quantity on the first side 301 and the second side 302 of the printed circuit board 300. In this embodiment, taking each of the second switch units S23, S24, S25, and S26 as an example that each includes two switch elements, for example, in Figures 5 - 8 the switch elements of the second switch unit are all marked as switch element 313. As shown in the figure, one of the switch elements 313 of each second switch unit is disposed on the first side 301 of the printed circuit board 300 and is adjacent to the first sidewall 304, and the other switch element 313 of each second switch unit is disposed on the second side 302 of the printed circuit board 300 and is adjacent to the first sidewall 304, and the two switch elements 313 of each second switch unit are electrically connected in parallel through vias (not shown) on the printed circuit board 300. Furthermore, in each second switch unit, the projection of the switch element 313 disposed on the first side 301 of the printed circuit board 300 on the second side 302 of the printed circuit board 300 will at least partially overlap with the other switch element 313 disposed on the second side 302 of the printed circuit board 300.

[0088] For further illustration, taking the first secondary winding group W3 and the second switch unit S23 that are electrically connected as an example, the current flowing through the first secondary winding group W3 is divided into two paths. A part of the current flows through one switch element 313 of the second switch unit S23 located on the first side 301, and the other part of the current flows through the other switch element 313 of the second switch unit S23 located on the second side 302. Therefore, the current flowing through the first secondary winding group W3 can be approximately evenly distributed between the two switch elements 313 of the second switch unit S23. In this embodiment, the first secondary winding group W3 is composed of multiple layers of printed circuit board planar windings, and the multiple planar windings are distributed in different internal layers of the printed circuit board 300. Therefore, the current flowing through the first secondary winding group W3 can be approximately evenly distributed between the internal layers of the printed circuit board 300, further reducing the equivalent DC impedance of the planar winding and reducing the loss on the winding. Similarly, according to the layout of the secondary winding and the second switch unit, the current flowing through the second secondary winding group W4, the current flowing through the third secondary winding group W5, and the current flowing through the fourth secondary winding group W6 are also approximately evenly distributed between the internal layers of the printed circuit board 300 and are approximately evenly distributed between the two corresponding switch elements. In this way, the loss generated on the current flowing path can be reduced. In this way, the loss generated on the current flowing path can be reduced, improving the power conversion efficiency of the power module 21.

[0089] In some embodiments, such as Figure 7and Figure 8 As shown, the positions of the two switching elements 313 of the second switching unit S23 on the first surface 301 and the second surface 302 of the printed circuit board 300 respectively will be correspondingly arranged and electrically connected to one end of the corresponding secondary winding group, such as the first secondary winding group W3, so as to achieve the effect that the current flowing through the first secondary winding group W3 is approximately evenly distributed on the first surface 301 and the second surface 302 of the printed circuit board 300. Similarly, the positions of the two switching elements 313 of the second switching unit S24 on the first surface 301 and the second surface 302 of the printed circuit board 300 respectively will be correspondingly arranged and electrically connected to one end of the corresponding second secondary winding group W4, and the positions of the two switching elements 313 of the second switching unit S25 on the first surface 301 and the second surface 302 of the printed circuit board 300 respectively will be correspondingly arranged and electrically connected to one end of the corresponding third secondary winding group W5, and the positions of the two switching elements 313 of the second switching unit S26 on the first surface 301 and the second surface 302 of the printed circuit board 300 respectively will be correspondingly arranged and electrically connected to one end of the corresponding fourth secondary winding group W6. Thus, in this embodiment, by applying the magnetic core 200 with a four-column magnetic core structure, winding the secondary winding groups on two winding columns respectively, and arranging the second switching units in one-to-one correspondence with the secondary winding groups, the effect of strengthening the uniform distribution of the current flowing through the first secondary winding group W3, the current flowing through the second secondary winding group W4, the current flowing through the third secondary winding group W5, and the current flowing through the fourth secondary winding group W6 on each layer of the printed circuit board 300 is achieved.

[0090] The angle between the connection line of the centers of at least two switching elements 313 of the multiple second switching units located on the first surface 301 and the connection line of the centers of the first winding column 211 and the second winding column 212 of the magnetic core 200 is any angle between [0 - 45] degrees, for example, it can be parallel. The angle between the connection line of the centers of at least two switching elements 313 of the multiple second switching units located on the second surface 302 and the connection line of the centers of the first winding column 211 and the second winding column 212 of the magnetic core 200 is any angle between [0 - 45] degrees, for example, it can be parallel. In addition, as Figure 6 or Figure 7 shown, among all the switching elements 313 of the multiple second switching units arranged on the first surface 301 or the second surface 302, at least two switching elements 313 are arranged adjacent to each other. As Figure 6 shown, all the switching elements 313 arranged on the first surface 301 or the second surface 302 can be uniformly arranged in a manner with the same or substantially the same spacing; or as Figure 7As shown, two switching elements 313 disposed on the first surface 301 or the second surface 302 are adjacent to each other, while the remaining switching elements 313 are spaced apart from the two adjacent switching elements 313. However, this is not limiting, and it can be set according to the actual printed circuit board wiring requirements. In this way, the uniform distribution of the large current on each layer of the printed circuit board can be further achieved, so as to reduce the loss generated on the current flowing path and improve the power conversion efficiency of the power module 21.

[0091] Please refer to Figure 6 and Figure 8 , the first end or the second end of the power module 21 may respectively have at least two sets of external terminals. Each set of external terminals includes at least one positive terminal and at least one negative terminal, and each two sets of external terminals include at least two positive terminals and at least one negative terminal. Here, taking the external terminals of the second end as an example, the positive terminals of the external terminals of the second end constitute the second positive end Vo+ of the power module 21, and the negative terminals of the external terminals of the second end constitute the second negative end Vo- of the power module 21. Among them, two positive terminals in each two sets of external terminals share a negative terminal, and the negative terminal is disposed between the two positive terminals. In another embodiment, each two sets of external terminals may include at least one positive terminal and at least two negative terminals, where two negative terminals in each two sets of external terminals share a positive terminal, and the positive terminal is disposed between the two negative terminals. In yet another embodiment, the at least two sets of external terminals may include at least two positive terminals and at least two negative terminals, where the positive terminals and the two negative terminals are arranged alternately, and each positive terminal and each negative terminal constitute a set of external terminals.

[0092] Furthermore, the power module 21 further includes a plurality of first metal blocks 311. The plurality of first metal blocks 311 are spaced apart and disposed on the second surface 302 of the printed circuit board 300, and are adjacent to the first sidewall 304 and located on the secondary side switching circuit group, that is, on one side of a plurality of second switching units S23, S24, S25, S26, and are located between the first sidewall 304 and the plurality of switching elements 313. Therefore, the plurality of second switching units S23, S24, S25, S26 are actually located between the plurality of first metal blocks 311 and the transformer T (or magnetic component 20).

[0093] As Figure 8 shown, the plurality of first metal blocks 311 can be respectively used to form potential terminals. Among them, at least one first metal block 311a in the plurality of first metal blocks 311 can constitute the second positive end Vo+ of the power module 21, and at least one first metal block 311b in the remaining plurality of first metal blocks 311 constitutes the second negative end Vo- of the power module 21. One metal block 311a and one metal block 311b can constitute a set of external terminals of the second end of the power module 21. The second end of the power module 21 may include at least two sets of external terminals, for example Figure 6and Figure 8 The three sets of external terminals illustrated, where the three sets of external terminals are arranged along the straight line direction D1. In another embodiment, Figure 6 and Figure 8 The illustrated external terminals can form four sets of external terminals. Each three adjacent metal blocks 311 are arranged in the pattern of a positive terminal (metal block 311a), a negative terminal (metal block 311b), and a positive terminal (metal block 311a) to form two sets of external terminals. Of course, the second end of the power supply module 21 is not limited to being as Figure 8 shown as three sets of external terminals. An appropriate number of first metal blocks 311 can also be selected to form multiple sets of external terminals.

[0094] In addition, the line connecting the centers of the first metal block 311a and the first metal block 311b in at least one set of external terminals is parallel to the line connecting the centers of the first winding post 211 and the second winding post 212 of the magnetic core 200. In another embodiment, the angle between the line connecting the centers of the first metal block 311a and the first metal block 311b in at least one set of external terminals and the line connecting the centers of the first winding post 211 and the second winding post 212 of the magnetic core 200 is any angle between [0, 45] degrees. In another embodiment, the angle between the line connecting the centers of at least two first metal blocks 311a or at least two first metal blocks 311b in at least two sets of external terminals and the line connecting the centers of the first winding post 211 and the second winding post 212 of the magnetic core 200 is any angle between [0, 45] degrees. Furthermore, as Figure 8 shown, the first metal block 311a and the first metal block 311b are arranged in an alternating manner. However, this is not limiting, and the arrangement order of the first metal block 311a and the first metal block 311b can be arbitrarily arranged. In addition, the power supply module 21 further includes a plurality of second metal blocks 312. The plurality of second metal blocks 312 are arranged at intervals on the second surface 302 of the printed circuit board 300 and are adjacent to the second side wall 303. The plurality of second metal blocks 312 can at least be used to form the first positive end of the power supply module 21. In other embodiments, the plurality of second metal blocks 312 can also be a plurality of signal ends for transmitting control signals.

[0095] Please refer again to Figure 7 and Figure 8, the printed circuit board 300 further includes a first through hole 300a and a second through hole 300b, which penetrate the printed circuit board 300 respectively. When the magnetic component 20 is disposed on the printed circuit board 300, the first winding post 211 will penetrate the first through hole 300a and at least partially be received in the first through hole 300a. In addition, the connection line between the center points of the first through hole 300a and the second through hole 300b is parallel to the straight line direction D1. Moreover, the included angle between the connection line of the center points of the metal blocks 311a and 311b in at least one set of external terminals and the connection line of the center points of the first winding post 211 and the second winding post 212 is any angle between [0 to 45] degrees. For example, the included angle between the connection line of the center points of the metal blocks 311a and 311b in at least one set of external terminals and the connection line of the center points of the two through holes 300a and 300b is 30 degrees. In addition, the included angle between the connection lines of the centers of at least two sets of external terminals and the connection line of the center points of the two through holes 300a and 300b is any angle between [0, 45] degrees. With this design, the winding groups on the first winding post 211 and the second winding post 212 are at the shortest distance from the external terminals, that is, the center points of the metal block 311a constituting the second positive terminal and the metal block 311b constituting the second negative terminal respectively, so as to reduce the equivalent DC impedance generated by the wiring of the printed circuit board 300 and reduce the loss of the power module 21. Furthermore, in addition to being arranged adjacent to each other along the straight line direction D1 on the first side wall 304 of the printed circuit board 300, the metal blocks 311 in multiple sets of external terminals are respectively placed in one-to-one correspondence with the switching elements 313 of the corresponding second switching unit, so as to achieve the uniform distribution of large current on each layer of the printed circuit board 300 and between layers, and further improve the power conversion efficiency of the power module 21. In addition, the printed circuit board 300 may further include a third through hole and a fourth through hole, wherein the third through hole and the fourth through hole can be formed by one of the ways of penetrating the printed circuit board or formed on the peripheral wall surface of the printed circuit, and the third through hole and the fourth through hole are respectively used for the first side post 213 and the second side post 214 to penetrate.

[0096] Please refer to again Figure 9 , which is Figure 5Partial cross-sectional top view of the power module shown when viewed from the E-E' direction. Assume that the distance from the top surface of the first connecting portion 215 of the magnetic component 20 to the first surface 301 of the printed circuit board 300 after assembly is H0 (in this embodiment, H0 is equal to the thickness H of the first connecting portion 215. In other embodiments, due to the assembly error of the magnetic core component, H0 can also be greater than H). Assume that the distance from the top surface of any switching element 313 in the second switching unit to the first surface 301 of the first printed circuit board 300 is H1 (i.e., the height of the switching element 313 in the second switching unit is H1). Assume that the distance from the top surface of the first switching unit S21 (of course, other first switching units S22, Sr21, Sr22 are also applicable) to the first surface 301 of the first printed circuit board 300 is H2 (i.e., the height of the switching element in the first switching unit S21 is H2). In this embodiment, Figure 9 The power module in Figures 1 - 4 employs a magnetic component as

[0097] which can reduce the thickness H of the second connecting portion 216 of the magnetic core 200, such that H0 = H1 = H2, thereby further reducing the thickness of the power module 21 and decreasing the size of the power module 21. In another embodiment, the thickness of the first connecting portion 215, i.e., the distance H0, can be 0.5 to 1.5 times the maximum value of the distances H1 and H2. For example, when the distance H1 > the distance H2, the distance H0 can be any value between 0.5 times and 1.5 times the distance H1. Of course, similar to the foregoing content, the thickness of the second connecting portion 216 of the magnetic core 200 can also be reduced, and no further description will be given here. Figure 10 In one embodiment, the positional relationship between the magnetic core 200 and the primary side winding in the power module 21 can be referred to Figures 1 to 4 The power module 21 uses the magnetic component shown in Figure 10 which can further reduce the width of the connecting portion of the magnetic core 200 of the magnetic component 20. In this way, there is partial overlap between the plane formed by the magnetic core 200 and the primary side winding group, and there is a non-overlapping area, where the switching element 313 of the second switching unit can be disposed in the non-overlapping area. As shown in Figure 6Comparison schematic diagram of the top view structure of the power module shown and the top view cross-sectional structure inside the magnetic component. Among them, label F represents the top view structure of the power module, and label G represents the top view cross-sectional structure inside the magnetic component 200. In this embodiment, the first primary winding group W1 and the second primary winding group W2 of the first winding group are respectively planar printed circuit board winding group layouts on a certain layer of the printed circuit board. In addition, the width WD1 of the magnetic core 200 is less than the width WD2 of the planar printed circuit board winding group constituting the first primary winding group W1, and is also less than the width (also WD2) of the planar printed circuit board winding group constituting the second primary winding group W2, thereby reducing the area of the region occupied by the magnetic component 20 on the first surface 301 and the second surface 302 of the printed circuit board 300. Thus, there is more remaining area to place other components. For example, the switching element 313 of the second switching unit can be placed adjacent to the magnetic component 200, and the projection of any switching element 313 perpendicular to the first surface 301 of the printed circuit board 300 will at least partially overlap with the planar printed circuit board winding group of the corresponding primary winding group (W1 or W2), such as more than 20% overlap, so as to further reduce the size of the power module 21, reduce the current-carrying path of large current, reduce the DC equivalent impedance on the current-carrying path, and improve the power density of the power module 21.

[0098] In addition, please refer to again Figure 5 and Figure 6 . In some embodiments, the power module 21 further includes at least one capacitor 314 (which can be Figure 2 the first capacitor C1 or the second capacitor C2 shown). In this embodiment, the capacitor 314 is the second capacitor C2. The two ends of the capacitor 314 are respectively electrically connected to the positive terminal and the negative terminal of at least one external terminal. The capacitor 314 can be placed on the first surface 301 and / or the second surface 302 of the printed circuit board 300. Further illustration, the capacitor 314 can be placed between two adjacent switching elements 313, but not limited thereto, and can also be arranged on one side of all the switching elements 313, so that all the switching elements 313 are located between the magnetic component 20 and at least one capacitor 314.

[0099] In addition, for the remaining electronic components in the power module 21 not mentioned above Figure 2 , they can be arbitrarily arranged on the printed circuit board 300 according to actual needs, which will not be elaborated here.

[0100] In summary, the present invention provides a power module. In the power module, an even number of switching elements of each second switching unit in the secondary-side switching circuit group are evenly arranged in terms of quantity on the first side and the second side of the printed circuit board, so that the current flowing through the secondary-side winding group electrically connected to the second switching unit is evenly distributed inside the printed circuit board, thereby improving the power conversion efficiency of the power module. In addition, the power module of the present invention uses a magnetic component to form the magnetic component. The magnetic core of the magnetic component is a four-column structure including two side columns and two winding columns, and the direction of the alternating magnetic flux generated by the winding group wound on one of the winding columns on the corresponding winding column is opposite to the direction of the alternating magnetic flux generated by the winding group wound on the other winding column on the corresponding winding column. In this way, the size of the power module is further reduced and the power density of the power module is increased.

Claims

1. A power module, comprising a printed circuit board, comprising a first surface and a second surface; a magnetic component, disposed on the printed circuit board, and comprising at least one primary winding group and a plurality of secondary winding groups; a secondary side switching circuit group, comprising a plurality of second switching units, each of the second switching units being electrically connected to a corresponding one of the secondary winding groups, and each of the second switching units comprising a plurality of switching elements connected in parallel, the plurality of switching elements of each of the second switching units being evenly placed on the first surface and the second surface of the printed circuit board in the same number, a part of the switching elements of each of the second switching units being disposed on the first surface, the remaining switching elements of each of the second switching units being disposed on the second surface, and the projection of the switching elements of each of the second switching units disposed on the first surface perpendicular to the second surface overlapping at least partially with the switching elements of the same second switching unit disposed on the second surface; and at least two sets of external terminals, the at least two sets of external terminals being disposed on the second surface and electrically connected to the plurality of second switching units respectively, wherein the at least two sets of external terminals are located on one side of the secondary side switching group, and the secondary side switching group is located between the magnetic component and the at least two sets of external terminals.

2. The power module according to claim 1, wherein the magnetic component comprises: a magnetic core, comprising a first winding post, a second winding post, a first side post, a second side post, a first connecting portion and a second connecting portion, wherein the first side post, the first winding post, the second winding post and the second side post are arranged in sequence along a long side direction of the magnetic core, and the first side post and the second side post are disposed between the first connecting portion and the second connecting portion and respectively disposed on two side edges of the first connecting portion and the second connecting portion, the first winding post and the second winding post are disposed between the first side post and the second side post; one of the primary winding groups is wound around the first winding post, and the other primary winding group is wound around the second winding post, two of the secondary winding groups are wound around the first winding post, and the remaining two secondary winding groups are wound around the second winding post.

3. The power module according to claim 2, wherein each two sets of the external terminals comprise at least two first potential terminals and at least one second potential terminal, and the angle between the line connecting the centers of the first potential terminals in each two sets of external terminals and the line connecting the centers of the first winding post and the second winding post of the magnetic core is any angle between 0 degree and 45 degrees.

4. The power module according to claim 2, wherein each two sets of external terminals comprise at least two first potential terminals and at least one second potential terminal, and the angle between the line connecting the centers of the at least two first potential terminals in each two sets of external terminals and the line connecting the centers of the first winding post and the second winding post of the magnetic core is any angle between 0 degree and 45 degrees.

5. The power module according to claim 2, wherein an angle between a line connecting centers of at least two of the switching elements located on the same surface of the first surface or the second surface of the printed circuit board and a line connecting centers of the first winding post and the second winding post is any angle between 0 degrees and 45 degrees.

6. The power module according to claim 2, wherein the power module further comprises a primary side switching circuit group electrically connected to two primary side winding groups of the magnetic component and including at least one first switching unit disposed on the first surface.

7. The power module according to claim 6, wherein a thickness of any one of the connecting portions is any value between 0.5 and 1.5 times a maximum value of thicknesses of the first switching unit and the switching elements of the second switching unit.

8. The power module according to claim 2, wherein a direction of an alternating magnetic flux generated by one of the two primary side winding groups on the first winding post is opposite to a direction of an alternating magnetic flux generated by the other primary side winding group on the second winding post.

9. The power module according to claim 2, wherein the two primary side winding groups are planar printed board winding groups, and a projection of any one of the switching elements perpendicular to the first surface coincides at least partially with the planar printed board winding group of the corresponding primary side winding group, and there is an uncoincident area.

10. The power module according to claim 9, wherein at least one switching element of the second switching unit is disposed in the uncoincident area.

11. The power module according to claim 2, wherein setting positions of the two switching elements of any one of the second switching units on the first surface and the second surface respectively correspond to one end of the secondary side winding group electrically connected to the second switching unit.

12. The power module according to claim 3 or 4, wherein the first potential terminal and the second potential negative terminal of the at least two sets of external connection terminals are metal blocks.

13. A power module, comprising a printed circuit board including a first surface and a second surface; a magnetic component disposed on the printed circuit board and including at least two winding posts, at least two side posts, two connecting portions, and at least two sets of winding groups, wherein the two connecting portions are used for connecting the at least two winding posts and the at least two side posts, the at least two winding posts are disposed between the at least two side posts, at least two sets of winding groups are respectively wound around the at least two winding posts, and directions of alternating magnetic fluxes on adjacent two winding posts are opposite; and a plurality of switching units disposed on the printed circuit board and respectively electrically connected to the at least two sets of winding groups; wherein a thickness of any one of the two connecting portions of the magnetic component is 0.5 to 1.5 times a maximum value of thicknesses of the plurality of switching units.

14. The power module according to claim 13, wherein a cross-sectional area of the connecting portion perpendicular to its long side direction is less than or equal to 75% of a cross-sectional area of the winding post perpendicular to its height direction.

15. The power supply module according to claim 13, wherein the cross-sectional area of the side column perpendicular to its height direction is less than or equal to 75% of the cross-sectional area of the winding column perpendicular to its height direction.

16. The power supply module according to claim 13, wherein the phase difference between the terminal voltages of one of the two sets of winding groups corresponding to the adjacent two winding columns is 180 degrees, and the winding directions of the two sets of winding groups on the corresponding winding columns are the same.

17. The power supply module according to claim 13, wherein the terminal voltages of one of the two sets of winding groups corresponding to the adjacent two winding columns are in the same phase, and the winding directions of the two sets of winding groups on the corresponding winding columns are opposite.

18. The power supply module according to claim 13, wherein the at least two sets of winding groups are planar printed circuit board winding groups.

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