Power supply module of conduction inductance type voltage stabilizer

Abstract

The power module comprises a transformer assembly, a top plate located on the top surface of the transformer assembly, and a first power device chip and a second power device chip which are located on the top surface of the top plate. Wherein the first power device chip and the second power device chip are respectively provided with at least one pin and are electrically connected to the transformer assembly through the top plate. According to the power supply module, the transformer and the power device chip are stacked and integrated in a module with a smaller size by reasonably setting a current path and arranging a device structure, so that the power density can be improved.

Description

Technical Field

[0001] The present invention relates to an electronic component, and more particularly to a power module. Background Art

[0002] Generally, a power converter is used to convert input power into output power with suitable voltage and current to provide it to the load. A conductive inductor regulator uses one winding of a transformer as its output inductor and is a power converter with fast transient characteristics and high output current. In a multi-phase conductive inductor regulator, each phase circuit includes a transformer, and all transformers share a magnetic core. The rapid development of modern GPUs (graphics processing units) and CPUs (central processing units) has put forward higher requirements on the load capacity of power modules. The high output current of the conductive inductor regulator makes it a better choice for power modules to power GPUs and CPUs. At the same time, in order to improve the integration, the size of the power module also needs to be reduced. The increasing current and the decreasing size have made the heat dissipation of the power module more challenging. In other words, a power module with high current density, high efficiency and excellent heat dissipation capability is needed. Summary of the invention

[0003] In view of one or more technical problems of the prior art, a power module of a conductive inductor regulator with a sandwich structure is proposed. The power module stacks and integrates transformers and power device chips into a smaller module by reasonably setting the current path and arranging the device structure.

[0004] According to an embodiment of the present technology, a power module is proposed, comprising: a transformer assembly having a top surface and a bottom surface; a top plate having a top surface and a bottom surface, the top plate being located on the top surface of the transformer assembly; and a first power device chip and a second power device chip being located on the top surface of the top plate, wherein the first power device chip and the second power device chip each have at least one pin, electrically connected to the transformer assembly through the top plate; wherein the transformer assembly comprises: a magnetic core; a first primary winding and a second primary winding; a first secondary winding and a second secondary winding; a first magnetic core portion and a second magnetic core portion; wherein the first primary winding and the second primary winding both pass through the magnetic core, the first secondary winding and the first primary winding are close, the first magnetic core portion is placed between the first primary winding and the first secondary winding, the second secondary winding and the second primary winding are close, the second magnetic core portion is placed between the second primary winding and the second secondary winding.

[0005] According to an embodiment of the present technology, a transformer assembly is proposed, comprising: a magnetic core having a top surface and a bottom surface; a first primary winding and a second primary winding, passing through the magnetic core from the top surface to the bottom surface of the magnetic core; a first secondary winding and a second secondary winding, wherein the first secondary winding is placed close to the first primary winding, and the second secondary winding is placed close to the second primary winding; and a first magnetic core portion and a second magnetic core portion, wherein the first magnetic core portion is placed between the first primary winding and the first secondary winding, and the second magnetic core portion is placed between the second primary winding and the second secondary winding.

[0006] According to an embodiment of the present technology, a power supply module is proposed, comprising: a transformer assembly having a top surface and a bottom surface; a top plate having a top surface and a bottom surface, the top plate being located on the top surface of the transformer assembly; a bottom plate being located on the bottom surface of the transformer assembly; a first power device chip and a second power device chip being located on the top surface of the top plate; wherein any one of the first power device chip and the second power device chip comprises: a switch pin; a ground pin; an input pin; a drive pin; a first power switch having a first end coupled to the input pin, a second end coupled to the switch pin, and a control end receiving a first drive signal; a second power switch having a first end coupled to the switch pin, a second end coupled to the ground pin, and a control end receiving a second drive signal; and a driver coupled to the drive pin to receive a switch control signal, and providing the first drive signal and the second drive signal based on the switch control signal; wherein the switch pin is electrically connected to the transformer assembly through the top plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to better understand the present invention, the present invention will be described in detail according to the following drawings:

[0008] Figure 1 A schematic diagram of the circuit structure of a multi-phase conductive inductor regulator 10 according to an embodiment of the present invention is shown;

[0009] Figure 2A A side view of a power module 20 of a two-phase conductive inductor regulator according to an embodiment of the present invention is shown;

[0010] Figure 2B A schematic diagram showing a top view, a bottom view and a cross-sectional view of a power module 20 according to an embodiment of the present invention;

[0011] Figure 3 shows a three-dimensional exploded view of a transformer assembly 30 according to an embodiment of the present invention;

[0012] Figure 4 shows a three-dimensional exploded view of a transformer assembly 40 according to an embodiment of the present invention;

[0013] Figure 5 A three-dimensional exploded schematic diagram of a transformer assembly 50 according to an embodiment of the present invention is shown;

[0014] Figure 6 shows a three-dimensional exploded view of a transformer assembly 60 according to an embodiment of the present invention;

[0015] Figure 7 shows a three-dimensional exploded view of a transformer assembly 70 according to an embodiment of the present invention;

[0016] Figure 8 shows a three-dimensional exploded view of a transformer assembly 80 according to an embodiment of the present invention;

[0017] Fig. 9 shows a three-dimensional exploded view of a transformer assembly 90 according to an embodiment of the present invention;

[0018] Fig.10 shows a three-dimensional exploded view of a transformer assembly 100 according to an embodiment of the present invention;

[0019] Fig.11 shows a three-dimensional exploded view of a transformer assembly 110 according to an embodiment of the present invention;

[0020] Fig.12 A three-dimensional exploded view of a transformer assembly 120 according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not have to be used to implement the present invention. In other examples, in order to avoid confusing the present invention, known circuits, materials or methods are not specifically described.

[0022] Throughout the specification, references to "one embodiment", "an embodiment", "an example" or "an example" mean that a particular feature, structure or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "in one embodiment", "in an embodiment", "an example" or "an example" that appear in various places throughout the specification do not necessarily refer to the same embodiment or example. In addition, particular features, structures or characteristics may be combined in one or more embodiments or examples in any appropriate combination and / or sub-combination. In addition, it should be understood by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and that the drawings are not necessarily drawn to scale. It should be understood that when an element is said to be "connected to" or "coupled to" another element, it may be directly connected or coupled to another element or there may be an intermediate element. In contrast, when an element is said to be "directly connected to" or "directly coupled to" another element, there is no intermediate element. The same reference numerals indicate the same element. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] Figure 1 The circuit structure diagram of a multi-phase conductive inductor regulator 10 according to an embodiment of the present invention is shown. The multi-phase conductive inductor regulator 10 shown includes a control module 11, a plurality of power device modules 12 (i.e., 12-1 to 12-n), and a plurality of transformers TR (i.e., TR1 to TRn), where n is an integer greater than 1. Figure 1 In the embodiment, a single power stage, that is, one phase of a multi-phase conductive inductor regulator 10, includes a first power switch M1, a second power switch M2, and a driver 13 for driving the power switches M1 and M2. The first power switch M1 has a first end connected to the input end P0 to receive an input voltage Vin, a second end connected to the switch end P2, and a control end receiving a drive signal G1 from the driver 13. The second power switch M2 has a first end connected to the switch end P2, a second end connected to the ground end to receive a reference ground PGND, and a control end receiving a drive signal G2 from the driver 13. The driver 13 controls the power switches M1 and M2 to be switched on and off alternately. Depending on the type of the power switches M1 and M2, the drive signals G1 and G2 may be in phase or out of phase. The control module 11 provides a plurality of phase control signals PWM1 to PWMn to the corresponding power device modules 12, respectively. The driver receives the corresponding phase control signal PWM and converts it into a corresponding drive signal for driving the power switches M1 and M2. In Figure 1 In the embodiment, the outputs of all phases are connected to one output terminal to supply energy to a single load. It should be understood that the outputs of each phase are independent, and each phase can be output separately, that is, the conductive inductor regulator 10 can be used as a regulator with multiple independent outputs to supply energy to multiple loads with different voltage requirements.

[0024] like Figure 1 As shown, each transformer TR has a primary winding Lp and a secondary winding Ls. Each primary winding Lp is coupled between its corresponding power device module 12 and the output voltage Vo. All secondary windings Ls are connected in series.

[0025] The conductive inductor regulator 10 further includes a compensation inductor Lc for suppressing output current ripple and improving system efficiency. By controlling the leakage inductance between the primary winding Lp and the secondary winding Ls of each transformer Tr, the compensation inductor Lc can be omitted. By omitting the compensation inductor Lc, the size of the power module of the conductive inductor regulator can be greatly reduced, thereby further improving the power integration of the power module.

[0026] In the embodiment of the present invention, n can be any integer. In some embodiments, n=2, and the conductive inductor regulator 10 is used as a dual-phase regulator or a regulator with two independent outputs.

[0027] Figure 2A FIG. 2 shows a side view of a power module 20 of a dual-phase conductive inductor regulator according to an embodiment of the present invention. Figure 1 In the embodiment, when n=2, a power module 20 can be used as its power stage. The power module 20 includes: a bottom plate 201, a top plate 202, a transformer assembly 203, power device chips 205-1 and 205-2, and a discrete device 204. The discrete device 204 includes resistors and capacitors of the conductive inductive regulator 10, such as an input capacitor at the input terminal P0 of the conductive inductive regulator 10, which is used to filter the pulse current of the input terminal P0 and stabilize the input voltage Vin, and a decoupling capacitor and a filter resistor for the power supply circuit of the driver and its internal logic circuit module. The bottom plate 201 and the top plate 202 can be PCB (Printed Circuit Board) boards.

[0028] The bottom plate 201 is located at the bottom of the power module 20. In some embodiments, the power module 20 is placed on the mainboard to provide power to the devices on the mainboard. In this case, the bottom plate 201 is welded or plugged into the mainboard, and some necessary pins / endpoints of the power module 20 are electrically connected to the mainboard through the solder joints / conductive traces of the bottom plate 201. In some embodiments, the bottom plate 201 can be omitted. In this case, the transformer assembly 203 is directly welded / plugged into the mainboard, and the solder joints / endpoints on the top plate 202 can also be electrically connected to the mainboard through a connector. It should be understood that in the embodiment with the bottom plate 201, there can also be a connector for connecting the bottom plate 201 and the top plate 202 to transmit signals between the two. The connector can be a plurality of metal pillars integrated by plastic packaging, or a plurality of metal sheets covering the surface of the transformer assembly 203 for connecting the top plate 202 and the bottom plate 201 (or the mainboard).

[0029] The transformer assembly 203 has a top surface 203-a and a bottom surface 203-b. The top plate 202 is placed on the top surface 203-a of the transformer assembly 203. The bottom plate 201 is placed on the bottom surface 203-b of the transformer assembly 203. The transformer assembly 203 integrates transformers 206-1 and 206-2, wherein each transformer includes a primary winding and a secondary winding, and the two transformers share a magnetic core 209. The transformer 206-1 has a first end 206-1a and a second end 206-1b, extending from the magnetic core 209 and connected to corresponding pads on the bottom plate 201 and the top plate 202, respectively. The transformer 206-2 has a first end 206-2a and a second end 206-2b, extending from the magnetic core 209 and connected to corresponding pads on the bottom plate 201 and the top plate 202, respectively. Specifically, in some embodiments, when Figure 1 The conductive inductor regulator 10 shown has a dual-phase structure, and when the power module 20 is used as its power stage, the first end 206-1a of the transformer 206-1 corresponds to Figure 1 The output voltage terminal P1 shown, the second terminal 206-1b corresponds to Figure 1 Accordingly, the first terminal 206-2a of the transformer 206-1 corresponds to Figure 1 The output voltage terminal P5 shown, the second terminal 206-2b corresponds to Figure 1 The switch terminal P6 is shown.

[0030] Apart from Figure 2A The transformer assembly 203 may have more terminals extending from the magnetic core 209 and being welded / plugged to the bottom plate 201, and the more terminals correspond to the terminals 206-1a, 206-1b, 206-2a and 206-2b. Figure 1 Endpoints P3, P4, P7 and P8 are shown.

[0031] Figure 2B Schematic diagrams of a top view, a bottom view and a cross-sectional view of a power module 20 according to an embodiment of the present invention are shown. The top view of the power module 20 shows the device side (i.e., the top surface) of the top plate 202, the bottom view shows the pad side (i.e., the bottom surface) of the bottom plate 201, and the cross-sectional view shows the structure cut from the top surface to the bottom surface of the power module 20 along the dashed line BB' and in the direction indicated by the arrow. Figure 2B In the embodiment, power device chips 205-1 and 205-2, discrete capacitors, discrete resistors and other devices are placed on the device surface of the top plate 202. The power device chips 205-1 and 205-2 have pins electrically connected to the corresponding discrete devices 204 through the top plate 202, and may also have pins electrically connected to the main board (not shown) through the top plate 202, the connector 207 and the bottom plate 201. Figure 2B In an embodiment, the connector 207 includes a metal pillar 207 - 1 disposed in a plastic frame 207 - 2 . The metal pillar 207 - 1 connects corresponding pads of the top plate 202 and the bottom plate 201 and transmits signals therebetween.

[0032] exist Figure 2B In the embodiment, the pad surface of the bottom plate 201 has a pad array to electrically connect the necessary terminals of the power module 20 to devices outside the power module 20, such as a PWM controller, etc. Figure 1 The control module 11 is shown. The pad array includes power pads 221-226 and signal pads 227-236. The pad is a structure for electrically connecting various terminals and devices. The pad can have a square structure (such as LGA, grid arrangement), a circular structure (such as BGA, ball matrix arrangement), or other appropriate shapes and structures. As mentioned above, the power module 20 can be applied to Figure 1 The multi-phase conductive inductor regulator 10 is shown. When the power module 20 is applied to a substrate (such as a motherboard) for power supply, the pins / pads / end points of the power module 20 can be electrically connected to corresponding pads / holes on the substrate.

[0033] exist Figure 2B In the illustrated embodiment, the power pads 221-226 are used to transfer power between the power module 20 and the substrate on which it is located. The signal pads 227-236 are used to transfer signals between the power module 20 and the substrate on which it is located. Figure 2B In the embodiment, each pad of the base plate 201 has a square shape of 0.45 mm×0.45 mm. Figure 2B The reference ground pad is labeled 223 and is electrically connected to Figure 1 The reference ground PGND of each power device chip is shown. It should be understood that Figure 2BOnly some of the reference ground pads are shown in the figure. In actual applications, more reference ground pads may be used as needed. The input voltage pad is marked as 226 and is electrically connected to Figure 1 The output voltage pad 221 is electrically connected to the input terminal P0 as shown. Figure 1 The output voltage terminal P1 shown in FIG. 1 is electrically connected to the output voltage pad 222. Figure 1 The secondary winding pad 224 corresponds to the output voltage terminal P5 shown. Figure 1 The secondary winding pad 225 corresponds to the terminal P3 shown in FIG. Figure 1 The terminal P8 shown. The pad 227 is used to transmit the phase control signal PWM1 to the power device chip 205-1; the pad 236 is used to transmit the phase control signal PWM2 to the power device chip 205-2; the pad 230 is used to transmit the temperature detection signal Tmon1 of the power device chip 205-1 to the external circuit; the pad 232 is used to transmit the temperature detection signal Tmon2 of the power device chip 205-2 to the external circuit; the pad 231 is used to receive the power supply voltage Vcc; the pad 229 is used to receive the enable signal EN1 of the power device chip 205-1; the pad 234 is used to receive the enable signal EN2 of the power device chip 205-2. In the embodiment of FIG. 2 , the signal pads 227-236 are arranged in a row, aligned with one side edge of the pad surface of the base plate 201. The input voltage pads 226 are arranged in a row, adjacent to and parallel to the row where the signal pads 227-236 are located, that is, located between the signal pads 227-236 and the reference ground pad 223. The reference ground pads 223 are arranged in three rows, adjacent to and parallel to the input voltage pads 226, and located between the input voltage pads 226 and the output voltage pads 221 / 222. The secondary winding pads 224 and 225 are respectively located at the upper end and the lower end of the row where the reference ground pads 223 are located, and in the embodiment of FIG. 2, the secondary winding pads 224 and 225 are actually electrically connected to the reference ground pad 223. The output voltage pads 221 and 222 are arranged in three rows, and the three rows are aligned parallel to the other side of the pad surface of the bottom plate 201, and the other side is parallel to the side adjacent to the signal pads 227-236, wherein the output voltage pads 221 are located on the upper side of the three rows, and the output voltage pads 222 are located on the lower side of the three rows. It should be understood that the pad arrangement of the power module 20 is generally determined by specific application requirements, such as the specific positions of the power device chips 205-1 and 205-2. According to different application requirements, the pad arrangement of the pad surface of the bottom plate 201 of the power module 20 will change accordingly.

[0034] The top view of the power module 20 shows the power device chips 205-1, 205-2 and other discrete devices 204 (including capacitors and resistors 204-1 to 204-13) located on the device side of the top plate 202. Figure 2BIn the embodiment, some discrete devices 204 are listed, such as input capacitor 204-1, which is distributed on the left side of the top view and between the power device chips 205-1 and 205-2; capacitors 204-3 and 204-9 of the RC filter circuit at the power supply end for powering the internal logic circuit of the power device chip; resistors 204-4 and 204-10 of the RC filter circuit at the power supply end for powering the internal logic circuit of the power device chip; bootstrap capacitors 204-7 and 204-13; and filter capacitors 204-2, 204-5, 204-6, 204-8, 204-11, 204-12, etc. at the power supply end for powering the driver of the power device chip. It should be understood that the type and quantity of the discrete devices of the power module, such as capacitors and resistors, depend on the specific application. Generally speaking, the capacitance of the capacitor of the power module is relatively small. Figure 2B In the embodiment, the power device chips 205-1 and 205-2 are the highest devices on the device surface of the top plate 202. Figure 2B As shown, the power device chip 205-1 has a switch pin 205-1a, a ground pin 205-1b, an input pin 205-1c and a drive pin 205-1d. The power device chip 205-2 has a switch pin 205-2a, a ground pin 205-2b, an input pin 205-2c and a drive pin 205-2d. The switch pin 205-1a corresponds to Figure 1 The switch terminal P2 is shown and is electrically connected to the second terminal 206-1b of the transformer 206-1. The switch pin 205-2a corresponds to Figure 1 The switch terminal P6 is shown and is electrically connected to the second terminal 206-2b of the transformer 206-2. The ground pins 205-1b and 205-2b correspond to Figure 1 The input pins 205-1c and 205-2c correspond to the ground terminals shown in FIG. Figure 1 The input terminal P0 is shown and is electrically connected to the input voltage pad 226 of the base plate 201. Figure 2B Some pins of the power device chips 205-1 and 205-2 are shown to help understand the circuit structure and device structure of the power module 20. For the sake of clarity, other pins of the power device chips 205-1 and 205-2 are not shown. Figure 2B It should be understood that in actual applications, the power device chips 205-1 and 205-2 include more pins, such as pins for transmitting signals and for electrically connecting to the signal pads of the base plate 201. In addition, Figure 2BThe positions of the pinouts of the power device chips 205-1 and 205-2 in the top view do not represent the actual pinouts, but are only for illustration. The pinouts of the power device chips 205-1 and 205-2 may vary depending on the actual application. In one embodiment, the height H1 of the power module 20 is in the range of 5 mm to 10 mm, the width of the top plate 202 is approximately 9 mm, and the length thereof is approximately 10 mm.

[0035] like Figure 2B As shown in the cross-sectional view in FIG. 1 , the transformer 206-1 includes a primary winding 210 and a secondary winding 211. The primary winding 210 shown has a first end 206-1a, a second end 206-1b, and a connecting portion 206-1c connecting the first end 206-1a and the second end 206-1b. The secondary winding 211 shown has a first leg 211-1, a second leg 211-2, and a middle portion 211-3 connecting the two legs. The length directions of the first leg 211-1 and the second leg 211-2 are perpendicular to the top plate 202 and the bottom plate 201. The middle portion 211-3 connects the first leg 211-1 and the second leg 211-2, and its length direction is parallel to the top plate 202 and the bottom plate 201. The first leg 211-1 has an end 211-a extending from the bottom surface 203-b of the magnetic core 209 and connected to the bottom plate 201. The second leg 211-2 has an end 211-b extending from the bottom surface 203-b of the magnetic core 209 and connected to the bottom plate 201. The ends 211-a and 211-b correspond to Figure 1 The transformer 206-2 has the same structure as the transformer 206-1, that is, it also has a secondary winding, and the two ends of the secondary winding extend from the bottom surface 203-b of the magnetic core 209. The two ends of the secondary winding of the transformer 206-2 correspond to Figure 1 Endpoints P7 and P8 are shown.

[0036] In the embodiment of the present invention, the transformer assembly and the power device chip are stacked to reduce the area of ​​the multi-phase conductive inductor regulator 10 on the main board / substrate. Each of the power device chips 205-1 and 205-2 integrates the following: Figure 1 The power device module 12 shown in the figure includes power switches M1 and M2, a driver 13, and Figure 1 The auxiliary circuit shown in Figure 2A and 2BIn the embodiment, the pins of the power device chips 205-1 and 205-2 are electrically connected to the pads of the bottom plate 201 through the top plate 202, the transformer assembly 203, and / or the connector 207 to ensure that all signals / power that need to be transmitted to the main board / substrate, or the signals / power obtained from the main board / substrate, can be obtained from the bottom plate 201.

[0037] Figure 3 A three-dimensional exploded view of a transformer assembly 30 according to an embodiment of the present invention is shown. The transformer assembly 30 may be used as Figure 2A The transformer assembly 203 in the power module shown. Figure 3 As shown, the transformer assembly 30 includes a magnetic core 301, two primary windings 302-1 and 302-2, two secondary windings 303-1 and 303-2, and two magnetic core parts 304-1 and 304-2. In the vertical direction, the magnetic core 301 has an "H"-shaped structure, and has two channels 301-1 and 301-2 passing through the magnetic core 301 from top to bottom. The primary windings 302-1 and 302-2 pass through the channels 301-1 and 301-2 respectively. The secondary windings 303-1 and 303-2 are respectively placed on the sides of the corresponding primary windings. The secondary winding 303-1 has an inverted "U"-shaped structure, that is, it has a first leg 303-1a, a second leg 303-1b and a connecting portion 303-1c connecting the first leg 303-1a and the second leg 303-1b. The secondary winding 303-2 also has an inverted "U" shaped structure, that is, it has a first leg 303-2a, a second leg 303-2b and a connecting portion 303-2c connecting the first leg 303-2a and the second leg 303-2b. The endpoints of each leg of the secondary winding 303-1 / 303-2 are welded to the base plate 201 or directly welded to the main board. Each magnetic core portion 304-1 / 304-2 is respectively located between the corresponding primary winding 302-1 / 302-2 and its corresponding secondary winding 303-1 / 303-2. In some embodiments, the transformer assembly 30 further includes magnetic core portions 305-1 and 305-2, which are respectively located below the secondary windings of the corresponding inverted "U" shaped structure and are half-surrounded by the secondary windings. According to the requirements of specific applications, the magnetic core parts 305-1 and 305-2 can be made of the same material as the magnetic core 301, or can be made of a different material from the magnetic core 301. In addition, to prevent a short circuit between the primary winding and the corresponding secondary winding, the remaining space between the primary winding and the corresponding secondary winding except the magnetic core parts is filled with isolation layers 306-1 and 306-2 respectively.

[0038] exist Figure 3 In the embodiment, when the transformer assembly 30 is used in the power module 20, the depth direction of the channels 301-1 and 301-2 is along the axis A, that is, Figure 2AThe illustration is perpendicular to the bottom plate 201 and the top plate 202 .

[0039] exist Figure 3 In the embodiment, the primary winding 302-1 has a first portion 302-1a bent 90 degrees to form a connection area for connecting to the top plate 202, and a second portion 302-1b passing through the channel 301-1. Similarly, the primary winding 302-2 has a first portion 302-2a bent 90 degrees to form a connection area for connecting to the top plate 202, and a second portion 302-2b passing through the channel 301-2. The second portion 302-1b of the primary winding 302-1 and the second portion 302-2b of the primary winding 302-2 are perpendicular to the top surface 301-a and the bottom surface 301-b of the magnetic core 301, so that the primary windings 302-1 and 302-2 have an "L"-shaped structure. The connection area of ​​each primary winding covers a portion of the top surface 301-a of the magnetic core 301, that is, the connection area extends on a plane perpendicular to the axis A, and the axis A is in the same direction as the depth direction of the channels 301-1 and 301-2 of the magnetic core 301. The magnetic core portion 304-1 / 304-2 is located between the connection area of ​​the corresponding primary winding 302-1 / 302-2 and the connection portion 303-1c / 303-2c of the corresponding secondary winding 303-1 / 303-2. In other embodiments, each primary winding 302-1 or 302-2 may further have a third portion bent 90 degrees relative to the second portion to form a connection area for connecting to the corresponding pad on the bottom plate 201, so that the primary windings 302-1 and 302-2 have a "Z" type structure or a "C" type structure. Whether the primary winding has a top end or a bottom end depends on whether the current path connected to the primary winding can be shortened and the convenience of wiring, and also depends on the positions of the pads on the top plate 202 and the bottom plate 201.

[0040] exist Figure 3 In an embodiment, the core parts 305-1 and 305-2 are independent parts. In some embodiments, the core parts 305-1 and 305-2 may also be connected to the core 301 or become a part of the core 301. The material used to make the core parts 304-1 and 304-2 may be the same as that of the core 301 or may be different. The thickness "T1" of the core parts 304-1 and 304-2 affects the leakage inductance of the corresponding transformer. The thicker the thickness "T1" of the core parts 304-1 and 304-2, the greater the leakage inductance of the corresponding transformer. In a typical application, when the height of the power module is 10 mm, the thickness "T1" of the core parts 304-1 and 304-2 is approximately between 0.5 mm and 1 mm.

[0041] Figure 4 FIG. 4 shows a three-dimensional exploded view of a transformer assembly 40 according to an embodiment of the present invention. The transformer assembly 40 can be used as Figure 2A The transformer assembly 203 in the power module shown. Figure 4 As shown, the structure of the transformer assembly 40 is similar to that of the transformer assembly 30, except that the positions of the magnetic core portion 404-1 / 404-2 and the isolation layer 406-1 / 406-2 in the transformer assembly 40 are exactly interchanged with the positions of the corresponding portions in the transformer assembly 30. Specifically, the magnetic core portion 404-1 / 404-2 is located between the corresponding primary winding and the secondary winding in the channel 401-1 / 401-2. Figure 4 In an embodiment, as shown in the figure, the thickness "T2" of the core portion 404-1 / 404-2 affects the leakage inductance of the corresponding transformer assembly. The thicker the thickness "T2" of the core portion 404-1 / 404-2, the greater the leakage inductance of the corresponding transformer. In a typical application, the thickness "T2" of the core portion 404-1 / 404-2 is approximately between 0.5 mm and 1 mm.

[0042] Figure 5 FIG. 5 shows a three-dimensional exploded schematic diagram of a transformer assembly 50 according to an embodiment of the present invention. The transformer assembly 50 can be used as Figure 2A The transformer assembly 203 in the power module shown. Figure 5 As shown, the structure of the transformer assembly 50 is similar to that of the transformer assembly 30, except that in the transformer assembly 50, all spaces / gaps between the primary winding and the corresponding secondary winding are filled by the corresponding magnetic core portion 504-1 / 504-2. Specifically, the magnetic core portion 504-1 / 504-2 has the same "L"-shaped structure as its corresponding primary winding, and is located between the corresponding primary winding and the secondary winding. Each magnetic core portion 504-1 / 504-2 has a first portion extending along the corresponding channel 501-1 / 501-2, and a second portion perpendicular to the first portion. Figure 5 In the illustrated embodiment, the thickness "T3" of the core portion 504-1 / 504-2 affects the leakage inductance of the corresponding transformer. The greater the thickness "T3", the greater the leakage inductance of the corresponding transformer. In a typical application, the thickness "T3" of the core portion 504-1 / 504-2 is approximately between 0.5 mm and 1 mm. Figure 5 In the illustrated embodiment, since the gaps between the primary windings and the corresponding secondary windings are partially filled by the magnetic core, the isolation layer can be omitted.

[0043] Figure 6 FIG. 4 shows a three-dimensional exploded view of a transformer assembly 60 according to an embodiment of the present invention. The transformer assembly 60 can be used as Figure 2A The transformer assembly 203 in the power module shown. Figure 6As shown, the transformer assembly 60 includes a magnetic core 601, two primary windings 602-1 and 602-2, two secondary windings 603-1 and 603-2, and two magnetic core parts 604-1 and 604-2. The magnetic core 601 is a cube and has two "N"-shaped channels 601-1 and 601-2 passing from the top surface to the bottom surface of the magnetic core 601. The windings 602-1 and 602-2 passing through the channels 601-1 and 601-2 respectively also have corresponding "N"-shaped structures. Figure 6 As shown, each primary winding 601-1 / 601-2 has a first portion N1, a second portion N2 and a third portion N3. The first portion N1 extends from the top surface 601-a of the magnetic core 601 to the inside of the magnetic core 601, and its length direction is perpendicular to the top surface 601-a, that is, along the Figure 2A The second portion N2 extends from the bottom surface 601-b of the magnetic core 601 to the inside of 601, and its length direction is perpendicular to the bottom surface 601-b, that is, along the direction shown in FIG. Figure 2B The third part N3 connects the first part N1 and the second part N2 inside the magnetic core 601. In one embodiment, the length direction of the third part N3 is parallel to the top surface 601-a and the bottom surface 601-b of the magnetic core 601. The secondary windings 603-1 and 603-2 are placed close to the corresponding primary windings 602-1 / 602-2 and below the third part N3 of the corresponding primary windings 602-1 / 602-2, wherein each secondary winding 603-1 and 603-2 has an inverted "U" shaped structure with two legs and a connecting portion connecting the legs. Each leg has one end welded to the bottom plate 201 or directly welded to the main board.

[0044] like Figure 6 As shown, the core portion 604-1 / 604-2 is respectively located between the corresponding primary winding and the secondary winding, and extends along the second portion N2 of the corresponding primary winding 602-1 / 602-2. To prevent a short circuit between the primary winding 602-1 / 602-2 and the corresponding secondary winding 603-1 / 603-2, the space / gap between the primary winding and the corresponding secondary winding is filled by the corresponding isolation layer 604-1 / 604-2, and the isolation layer 604-1 / 604-2 extends along the third portion N3 of the corresponding primary winding 602-1 / 602-2.

[0045] exist Figure 6In the embodiment, the first portion N1 of the primary winding 602-1 and the first portion N1 of the primary winding 602-2 are flush with the first side 601-c of the magnetic core 601. The second portion N2 of the primary winding 602-1 and the second portion N2 of the primary winding 602-2 are flush with the second side 601-d of the magnetic core 601. The first side 601-c and the second side 601-d of the magnetic core 601 are opposite to each other. Figure 6 In the embodiment, the surface of the first part N1 and the second part N2 of each primary winding is exposed on the corresponding surface of the magnetic core 601. It should be understood that the surface of the first part N1 and the second part N2 of each primary winding can also be located inside the magnetic core 601 and covered by the surface of the magnetic core 601. In other words, except for the end points extending out of the top surface 601-a and the bottom surface 601-b of the magnetic core 601, the other parts of the primary winding 602-1 / 602-2 are located inside the magnetic core 601 and are completely covered by the surface of the magnetic core.

[0046] exist Figure 6 In the embodiment, the magnetic core parts 604-1 and 604-2 are respectively located between the third part N3 of the corresponding primary winding and the middle part of the corresponding inverted "U"-shaped secondary winding. Figure 3 As shown. That is, the core parts 604-1 and 604-2 are located inside the magnetic core 601, and their planes are parallel to the top surface 601-a and the bottom surface 601-b of the magnetic core 601. The material of the core parts 604-1 and 604-2 can be the same as the material of the magnetic core 601, or different. The thickness "T4" of the core parts 604-1 and 604-2 affects the leakage inductance of the corresponding transformer. In one embodiment, the thicker the core parts 604-1 and 604-2, the greater the leakage inductance of the corresponding transformer. In a typical application, the thickness "T4" of the core parts 604-1 and 604-2 is 0.5-1mm.

[0047] Figure 7 FIG. 1 shows a three-dimensional exploded view of a transformer assembly 70 according to an embodiment of the present invention. Figure 6 The positions of the magnetic core part and the isolation layer of the transformer assembly 60 shown are interchanged to obtain the transformer assembly 70. Figure 7 In the embodiment, the magnetic core portion 704-1 / 704-2 is located between the third portion N3 of the corresponding primary winding 702-1 / 702-2 and the middle portion of the corresponding secondary winding 703-1 / 703-2. Figure 7 The thickness "T5" of the core portion 704-1 / 704-2 shown will affect the leakage inductance of the corresponding transformer.

[0048] Figure 8 FIG. 8 shows a three-dimensional exploded view of a transformer assembly 80 according to an embodiment of the present invention. Figure 8In the embodiment, the gaps between the primary windings 802-1 / 802-2 and the corresponding secondary windings 803-1 / 803-2 are almost completely filled by the corresponding magnetic core portions 804-1 / 804-2. Figure 5 In this case, each core portion 804-1 / 804-2 has an "L" shape. The thickness "T5" of the core portion 804-1 / 804-2 will affect the leakage inductance of the corresponding transformer.

[0049] Fig. 9 FIG. 1 shows a three-dimensional exploded view of a transformer assembly 90 according to an embodiment of the present invention. Figure 7 Compared with the embodiment, Fig. 9 In the embodiment, the primary windings 902-1 and 902-2 are placed opposite to each other. Fig. 9 As shown, the first portion N1 of the primary winding 902-1 and the first portion N1 of the primary winding 902-2 are respectively located on two opposite sides of the magnetic core 901. Correspondingly, the second portion N2 of the primary winding 902-1 and the second portion N2 of the primary winding 902-2 are also respectively located on two opposite sides of the magnetic core 901. More specifically, the first portion N1 of the primary winding 902-1 and the second portion N2 of the primary winding 902-2 are aligned with one side of the magnetic core 901, while the second portion N2 of the primary winding 902-1 and the first portion N1 of the primary winding 902-2 are aligned with the other side of the magnetic core 901. Figure 7 Similar to the embodiment, the thickness "T6" of the core portion 904-1 / 904-2 affects the leakage inductance of the corresponding transformer.

[0050] In some embodiments, the magnetic core portion 904-1 / 904-2 and the corresponding isolation layer 906-1 / 906-2 can be interchanged. In some embodiments, the isolation layer 906-1 / 906-2 is removed, and the magnetic core portion 904-1 / 904-2 is extended to fill the gap between the corresponding primary winding and the secondary winding, such as Figure 8 As shown in the embodiment.

[0051] Fig.10 FIG. 1 shows a three-dimensional exploded view of a transformer assembly 100 according to an embodiment of the present invention. Fig. 9Compared with the embodiment, the leg of the secondary winding at one side of the magnetic core is removed, and the connection parts of the two secondary windings are connected inside the magnetic core. Thus, inside the magnetic core, the two secondary windings are connected into a whole, namely, the secondary winding 1003. Specifically, the secondary winding 1003 has a first part S1, a second part S2, a third part S3, a fourth part S4 and a fifth part S5. The first part S1 is located below the third part N3 of the primary winding 1002-1 and is parallel to the third part N3. The second part S2 is located below the third part N3 of the primary winding 1002-2 and is parallel to the third part N3. The third part S3 and the fourth part S4 extend from the first part S1 and the second part S2 to the bottom surface 1001-b of the magnetic core 1001, respectively. The fifth part S5 connects the first part S1 and the second part S2 inside the magnetic core 1001.

[0052] Similar to the aforementioned embodiments of the present invention, the magnetic core portion 1004-1 and the isolation layer 1006-1 can be interchanged. Similarly, the magnetic core portion 1004-2 and the isolation layer 1006-2 can also be interchanged. When the positions are interchanged, the shape and size of the magnetic core portion and the isolation layer can be adaptively adjusted. In some embodiments, the isolation layers 1006-1 and 1006-2 are removed, and the gaps between the primary winding 1002-1 / 1002-2 and the secondary winding 1003 are filled with the corresponding magnetic core portion 1004-1 / 1004-2.

[0053] Fig.11 FIG. 1 shows a three-dimensional exploded view of a transformer assembly 110 according to an embodiment of the present invention. The transformer assembly 110 can be used as Figure 2A The transformer assembly 203 in the power module shown. Fig.11As shown, the transformer assembly 110 includes a magnetic core 1101, primary windings 1102-1 / 1102-2, secondary windings 1103-1 / 1103-2 and magnetic core parts 1104-1 / 1104-2. The magnetic core 1101 has a cubic structure, wherein two channels 1101-1 and 1101-2 pass through the magnetic core 1101 obliquely from top to bottom. The two channels 1101-1 and 1101-2 are straight and parallel to each other. The primary windings 1102-1 and 1102-2 pass through the two channels 1101-1 and 1101-2, respectively. The secondary windings 1103-1 and 1103-2 are respectively close to the corresponding primary windings 1102-1 and 1102-2, and are located below the primary windings 1102-1 and 1102-2, wherein each secondary winding 1103-1 / 1103-2 has an inverted "V" shaped structure and has two parts / legs E1 and E2 respectively. The endpoints of the two legs of each secondary winding can be welded or connected to the bottom plate 201 or are directly connected to the main board. The part / leg E1 of the secondary winding 1103-1 / 1103-2 is parallel to the corresponding primary winding 1102-1 / 1102-2, and the other part / leg E2 thereof is exposed to one side of the magnetic core, such as Fig.11 As shown. The two ends of the primary windings 1102-1 and 1102-2 exposed on the top surface 1101-a of the magnetic core 1101 are in a straight line, which is parallel to the side where the portion / leg E2 of the secondary winding 1103-1 / 1103-2 is located. It should be understood that in other embodiments, the portion / leg E2 of the secondary winding 1103-1 / 1103-2 can also be located inside the magnetic core 1101 and completely covered by the surface of the magnetic core. The gap between the primary winding 1102-1 / 1102-2 and the corresponding secondary winding 1103-1 / 1103-2 is filled by the corresponding magnetic core portion 1104-1 / 1104-2. The thickness "T8" of the magnetic core portion 1104-1 / 1104-2 affects the leakage inductance of the corresponding transformer.

[0054] Fig.12 FIG. 1 shows a three-dimensional exploded view of a transformer assembly 120 according to an embodiment of the present invention. The transformer assembly 120 can be used as Figure 2A The transformer assembly 203 in the power module shown. Fig.11 Compared with the embodiment, Fig.12The projections of the primary windings 1201 and 1202 on the two back-to-back sides of the magnetic core in the embodiment intersect with each other. Specifically, the endpoint of the primary winding 1201-1 exposed on the top surface 1201-a of the magnetic core 1201 and the endpoint of the primary winding 1201-2 exposed on the top surface 1201-a of the magnetic core 1201 are located on opposite sides of the top surface 1201-a. Similarly, the endpoints of the primary winding 1201-1 and the primary winding 1201-2 exposed on the bottom surface 1201-b of the magnetic core 1201 are also located on opposite sides of the bottom surface 1201-b. Correspondingly, a portion / leg E1 of the secondary winding 1203-1 is parallel to the corresponding primary winding 1201-1 and is located thereunder, and another portion / leg E2 of the secondary winding 1203-1 is exposed on the corresponding side of the magnetic core, as shown in FIG. Fig.12 A portion / leg E1 of the secondary winding 1203-2 is parallel to and below the corresponding primary winding 1201-2, and another portion / leg E2 of the secondary winding 1203-2 is exposed to the corresponding side of the magnetic core, as shown in FIG. Fig.12 As shown. It should be understood that in other embodiments, the portion / leg E2 of the secondary winding 1203-1 / 1203-2 may also be located inside the magnetic core 1201 and completely covered by the surface of the magnetic core. The gap between the primary winding 1202-1 / 1202-2 and the corresponding secondary winding 1203-1 / 1203-2 is filled by the corresponding magnetic core portion 1204-1 / 1204-2. The thickness "T9" of the magnetic core portion 1204-1 / 1204-2 affects the leakage inductance of the corresponding transformer.

[0055] For the sake of clarity, the above embodiments introduce the present invention by taking a two-phase power supply module as an example. It should be understood that some embodiments of the present invention may include a multi-phase (more than two-phase) power supply module. The number of primary windings and corresponding secondary windings in the magnetic core and the power device chips located on the magnetic core can be increased as needed to form a multi-phase power supply module. At the same time, a single-phase power supply module with a single transformer module having a single primary winding and a corresponding secondary winding passing through the magnetic core is also within the spirit and scope of the present invention.

[0056] The present invention provides an inductor including a plurality of magnetic core parts and a method for making the same. Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be implemented in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, and therefore all changes and modifications that fall within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A power module, comprising: a transformer assembly having a top surface and a bottom surface; A top plate having a top surface and a bottom surface, wherein the top plate is located on the top surface of the transformer assembly; as well as A first power device chip and a second power device chip are located on the top surface of the top plate, wherein the first power device chip and the second power device chip each have at least one pin, and are electrically connected to the transformer assembly through the top plate; in The transformer assembly comprises: Magnetic core; a first primary winding and a second primary winding; a first secondary winding and a second secondary winding; a first core portion and a second core portion; wherein The first primary winding and the second primary winding both pass through the magnetic core, the first secondary winding is close to the first primary winding, the first magnetic core part is placed between the first primary winding and the first secondary winding, the second secondary winding is close to the second primary winding, and the second magnetic core part is placed between the second primary winding and the second secondary winding.

2. The power module as claimed in claim 1, further comprising a bottom plate located on the bottom surface of the transformer assembly.

3. The power module according to claim 1, wherein The first primary winding and the second primary winding both pass through the magnetic core from the top surface to the bottom surface of the transformer assembly; and The first secondary winding and the second secondary winding each have a first end and a second end extending through a bottom surface of the transformer assembly.

4. The power module according to claim 1, wherein: The first primary winding and the second primary winding each have a connecting portion passing through the magnetic core and perpendicular to the top surface and the bottom surface of the magnetic core; and The first secondary winding and the second secondary winding each have two legs and a middle part connecting the two legs, presenting an inverted "U" shaped structure, wherein one of the legs of the first secondary winding is placed close to the first primary winding and parallel to the first primary winding, and one of the legs of the second secondary winding is placed close to the second primary winding and parallel to the second primary winding.

5. The power module according to claim 1, wherein: The transformer assembly further comprises: A third magnetic core portion is located within a semi-enclosure of the first secondary winding; and The fourth magnetic core portion is located within a semi-enclosure of the second secondary winding.

6. The power module according to claim 1, wherein The first primary winding and the second primary winding both obliquely pass through the magnetic core from the top surface to the bottom surface of the transformer assembly; and The first secondary winding and the second secondary winding each have two legs connected to form an inverted "V" shape structure, wherein one of the legs of the first secondary winding is placed close to the first primary winding and parallel to the first primary winding, and one of the legs of the second secondary winding is placed close to the second primary winding and parallel to the second primary winding.

7. The power module according to claim 1, wherein: The first primary winding and the second primary winding each have a first part, a second part and a third part, the first part of the first primary winding extends from the top surface of the magnetic core to the inside of the magnetic core, the second part of the first primary winding extends from the bottom surface of the magnetic core to the inside of the magnetic core, the third part of the first primary winding connects the first part and the second part of the first primary winding inside the magnetic core, so that the first primary winding presents an "N"-shaped structure, the first part of the second primary winding extends from the top surface of the magnetic core to the inside of the magnetic core, the second part of the second primary winding extends from the bottom surface of the magnetic core to the inside of the magnetic core, the third part of the second primary winding connects the first part and the second part of the second primary winding inside the magnetic core, so that the second primary winding presents an "N"-shaped structure; as well as The first secondary winding and the second secondary winding each have two legs and a middle part connecting the two legs, presenting an inverted "U" shaped structure, wherein the middle part of the first secondary winding is placed under the third part of the first primary winding and parallel to the third part of the first primary winding, the first magnetic core part is placed between the third part of the first primary winding and the middle part of the first secondary winding, the middle part of the second secondary winding is placed under the third part of the second primary winding and parallel to the third part of the second primary winding, and the second magnetic core part is placed between the third part of the second primary winding and the middle part of the second secondary winding.

8. A transformer assembly, comprising: a magnetic core having a top surface and a bottom surface; A first primary winding and a second primary winding pass through the magnetic core from a top surface to a bottom surface of the magnetic core; a first secondary winding and a second secondary winding, wherein the first secondary winding is placed close to the first primary winding, and the second secondary winding is placed close to the second primary winding; as well as A first magnetic core portion and a second magnetic core portion, wherein the first magnetic core portion is disposed between the first primary winding and the first secondary winding, and the second magnetic core portion is disposed between the second primary winding and the second secondary winding. 9 . The transformer assembly of claim 8 , wherein the first secondary winding and the second secondary winding each have a first end and a second end extending through a bottom surface of the magnetic core.

10. The transformer assembly of claim 8, wherein The first primary winding and the second primary winding each have a connecting portion passing through the magnetic core and perpendicular to the top surface and the bottom surface of the magnetic core; The first secondary winding and the second secondary winding each have two legs and a middle part connecting the two legs, presenting an inverted "U" shaped structure, wherein one of the legs of the first secondary winding is placed close to the first primary winding and parallel to the first primary winding, and one of the legs of the second secondary winding is placed close to the second primary winding and parallel to the second primary winding.

11. The transformer assembly of claim 8, wherein: The first primary winding and the second primary winding both obliquely pass through the magnetic core from the top surface to the bottom surface of the magnetic core; and The first secondary winding and the second secondary winding each have two legs connected to form an inverted "V" shape structure, wherein one of the legs of the first secondary winding is placed close to the first primary winding and parallel to the first primary winding, and one of the legs of the second secondary winding is placed close to the second primary winding and parallel to the second primary winding. 12 . The transformer assembly of claim 11 , wherein projections of the first primary winding and the second primary winding on a first side surface and a second side surface of the magnetic core overlap, and the first side surface and the second side surface are opposite to each other. 13 . The transformer assembly of claim 11 , wherein projections of the first primary winding and the second primary winding on a first side surface and a second side surface of the magnetic core are intersected, and the first side surface and the second side surface are opposite to each other.

14. The transformer assembly of claim 8, wherein: The first primary winding and the second primary winding each have a first part, a second part and a third part, the first part of the first primary winding extends from the top surface of the magnetic core to the inside of the magnetic core, the second part of the first primary winding extends from the bottom surface of the magnetic core to the inside of the magnetic core, the third part of the first primary winding connects the first part and the second part of the first primary winding inside the magnetic core, so that the first primary winding presents an "N"-shaped structure, the first part of the second primary winding extends from the top surface of the magnetic core to the inside of the magnetic core, the second part of the second primary winding extends from the bottom surface of the magnetic core to the inside of the magnetic core, the third part of the second primary winding connects the first part and the second part of the second primary winding inside the magnetic core, so that the second primary winding presents an "N"-shaped structure; The first secondary winding and the second secondary winding each have two legs and a middle part connecting the two legs, presenting an inverted "U" shaped structure, wherein the middle part of the first secondary winding is placed under the third part of the first primary winding and parallel to the third part of the first primary winding, the first magnetic core part is placed between the third part of the first primary winding and the middle part of the first secondary winding, the middle part of the second secondary winding is placed under the third part of the second primary winding and parallel to the third part of the second primary winding, and the second magnetic core part is placed between the third part of the second primary winding and the middle part of the second secondary winding.

15. The transformer assembly of claim 14, wherein endpoints of the first portion of the first primary winding and the second primary winding extend out of the top surface of the magnetic core, close to and aligned with the first side surface of the magnetic core, and endpoints of the second portion of the first primary winding and the second primary winding extend out of the bottom surface of the magnetic core, close to and aligned with the second side surface of the magnetic core, and the first side surface and the second side surface are opposite to each other.

16. The transformer assembly of claim 14, wherein endpoints of the first portion of the first primary winding and the second primary winding extend out of the top surface of the magnetic core, and endpoints of the second portion of the first primary winding and the second primary winding extend out of the bottom surface of the magnetic core, an endpoint of the first portion of the first primary winding and an endpoint of the second portion of the second primary winding are close to and aligned with the first side surface of the magnetic core, an endpoint of the second portion of the first primary winding and an endpoint of the first portion of the second primary winding are close to and aligned with the second side surface of the magnetic core, and the first side surface and the second side surface are opposite to each other.

17. The transformer assembly of claim 14, wherein the first secondary winding and the second secondary winding are replaced by a single secondary winding, the single secondary winding comprising: a first portion, located below the third portion of the first primary winding and parallel to the third portion of the first primary winding; a second portion located below the third portion of the second primary winding and parallel to the third portion of the second primary winding; a third portion extending from the first portion of the single secondary winding toward the bottom surface of the magnetic core; a fourth portion extending from the second portion of the single secondary winding toward the bottom surface of the magnetic core; as well as The fifth part connects the first part and the second part inside the magnetic core.

18. A power module, comprising: a transformer assembly having a top surface and a bottom surface; A top plate having a top surface and a bottom surface, wherein the top plate is located on the top surface of the transformer assembly; A base plate located on the bottom surface of the transformer assembly; A first power device chip and a second power device chip are located on the top surface of the top plate; in Any one of the first power device chip and the second power device chip comprises: Switch pin; Ground pin; Input pins; Drive pins; A first power switch, having a first end coupled to the input pin, a second end coupled to the switch pin, and a control end receiving a first driving signal; A second power switch having a first end coupled to the switch pin, a second end coupled to the ground pin, and a control end for receiving a second driving signal; and A driver, coupled to the driving pin to receive a switch control signal, and providing the first driving signal and the second driving signal based on the switch control signal; wherein The switch pins are electrically connected to the transformer assembly through the top plate.

19. The power module of claim 18, wherein the transformer assembly comprises: Magnetic core; a first primary winding and a second primary winding; a first secondary winding and a second secondary winding; as well as a first core portion and a second core portion; in The first primary winding and the second primary winding both pass through the magnetic core, the first secondary winding is close to the first primary winding, the first magnetic core part is placed between the first primary winding and the first secondary winding, the second secondary winding is close to the second primary winding, and the second magnetic core part is placed between the second primary winding and the second secondary winding.

20. The power module of claim 19, wherein: The first primary winding has a first end electrically connected to a first output voltage pad group on the bottom plate, and a second end electrically connected to a switch pin of the first power device chip through the top plate; and The second primary winding has a first end electrically connected to a second output voltage pad group on the bottom plate, and has a second end electrically connected to a switch pin of the second power device chip through the top plate.

21. The power module according to claim 19, wherein the bottom plate comprises a pad surface, the pad surface has a pad array, the pad array comprises: A first output voltage pad group, electrically connected to a first end of the first primary winding; a second output voltage pad group, electrically connected to a first end of the second primary winding; A ground pad group, electrically connected to the ground pins of the first power device chip and the second power device chip; An input voltage pad group, electrically connected to input pins of the first power device chip and the second power device chip; The signal pad group includes a plurality of pads, wherein each pad is electrically connected to a corresponding pin of the first power device chip and the second power device chip.

22. The power module according to claim 21, wherein: The pads in the signal pad group are arranged in a row and parallel to one side of the bottom plate.

23. The power module according to claim 22, wherein: The input voltage pad group includes a plurality of pads arranged in a row, adjacent to and parallel to the row where the pads in the signal pad group are located; The first output voltage pad group and the second output voltage pad group each include a plurality of pads arranged in three columns, the pads of the first output voltage pad group are located in the upper half of the three columns, and the pads of the second output voltage pad group are located in the lower half of the three columns; as well as The ground pad group includes a plurality of pads arranged in a plurality of columns and located between the column where the input voltage pad group is located and the column where the first output voltage pad group and the second output voltage pad group are located.

24. The power module of claim 18, further comprising: The connector electrically connects the pads on the top plate and the pads on the bottom plate to transmit signals between the top plate and the bottom plate.

25. The power module of claim 18, further comprising a plurality of discrete devices located on a top surface of the top plate.

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