CN115714062B

CN115714062B - Switching power supply and computing device

Info

Publication number: CN115714062B
Application number: CN202211500381.0A
Authority: CN
Inventors: 焦海清; 童建利
Original assignee: XFusion Digital Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-07-04
Anticipated expiration: 2042-11-28
Also published as: CN116844829A; CN115714062A

Abstract

The embodiment of the application relates to the technical field of power supplies, in particular to a switching power supply and computing equipment. The switching power supply includes: a circuit board and a transformer; the transformer comprises a PCB winding, a coil assembly and a magnetic core; the circuit board is provided with a first through hole; the PCB winding surrounds the first through hole and is arranged in the circuit board; the coil assembly comprises a coil, a bearing plate, a first connector and a second connector; the bearing plate is provided with a second through hole, and the coil is fixedly arranged on the first surface of the bearing plate around the second through hole; the first connector and the second connector are at least partially arranged on the second surface of the bearing plate; the first connector and the second connector respectively comprise a first end and a second end; the first end of the first connector is electrically connected with one end of the coil, and the second end of the first connector is electrically connected with the circuit board; the first end of the second connector is electrically connected with the other end of the coil, and the second end of the second connector is electrically connected with the circuit board; the center pillar of the magnetic core penetrates through the first through hole and the second through hole. The switching power supply can be prepared in an automated manner.

Description

Switching power supply and computing device

Technical Field

The present disclosure relates to power technology, and in particular, to a switching power supply and a computing device.

Background

With the development of power electronics technology, the power density of switching power supplies such as a switching power supply is higher and higher, the size of the switching power supply is smaller and the output power of the switching power supply is larger and higher. And, energy efficiency standards are increasingly demanding on the power efficiency of switching power supplies.

Current switching power supplies either have difficulty meeting power density and/or power efficiency requirements or are complex to manufacture. Therefore, there is a need for a switching power supply that can meet the requirements of power density and power efficiency, yet is easy to manufacture.

Disclosure of Invention

The embodiment of the application provides a switching power supply and computing equipment, and the switching power supply can be assembled and prepared in an automatic mode.

In a first aspect, a switching power supply is provided, comprising: a circuit board and a transformer; the transformer comprises a PCB winding, a coil assembly and a magnetic core; the circuit board is provided with a first through hole; the PCB winding surrounds the first through hole and is arranged in the circuit board; the coil assembly is arranged above the circuit board and comprises a coil, a bearing plate, a first connector and a second connector; the bearing plate comprises a first surface and a second surface which are oppositely arranged; the second surface faces the circuit board; the bearing plate is provided with a second through hole, and the coil is fixedly arranged on the first surface of the bearing plate around the second through hole; the first connector and the second connector are at least partially arranged on the second surface of the bearing plate; the first connector and the second connector respectively comprise a first end and a second end; the first end of the first connector is electrically connected with one end of the coil, and the second end of the first connector is electrically connected with the circuit board; the first end of the second connector is electrically connected with the other end of the coil, and the second end of the second connector is electrically connected with the circuit board; the first through hole and the second through hole are oppositely arranged; the magnetic core comprises a center post; the center pillar penetrates through the first through hole and the second through hole.

In the switching power supply, a coil assembly mode is adopted, and a coil is assembled on a circuit board through a bearing plate, so that the coil, a PCB winding in the circuit board and a magnetic core form a transformer, and the automatic assembly of the transformer can be realized. Specifically, the coil is fixedly arranged on the bearing plate, and the bearing plate can be used for the operation of the automatic equipment, so that the automatic equipment can assemble the coil on the circuit board by operating the bearing plate, and the automatic assembly of the coil is realized.

In one possible embodiment, the coil is wound from litz wire. The litz wire is used to reduce the alternating current resistance of the coil, thereby reducing the loss of the transformer.

In the switching power supply, the coil is adopted as the primary side of the transformer, so that the transformer is a transformer with a PCB winding relative to the primary side and the secondary side, the loss of the primary side is reduced, and the efficiency of the switching power supply is improved.

In short, the switching power supply provided by the embodiment of the application realizes automatic assembly while improving the power supply efficiency, and improves the production efficiency of the switching power supply.

In one possible embodiment, the carrier plate comprises two connecting through holes; the first connector penetrates through the bearing plate through a connecting through hole; the second connector penetrates through the bearing plate through the other connecting through hole; the first end of the first connector and the first end of the second connector are convexly arranged on the first surface of the bearing plate; the second end of the first connector and the second end of the second connector are convexly arranged on the second surface of the bearing plate.

In this embodiment, the connector runs through the loading board, and the protruding one end of establishing at first surface connects the coil, and the protruding one end of establishing at the second surface is used for connecting the circuit board, from this, can conveniently link together circuit board and coil, has improved switching power supply's preparation efficiency.

In one possible embodiment, the carrier comprises a first side and a second side which are arranged opposite to each other; the first side surface and the second side surface are positioned between the first surface and the second surface; wherein, the first side of the bearing plate is close to the outlet end of the coil, and the second side of the bearing plate is far away from the outlet end of the coil; the first connecting body wraps part of the first surface, the first side surface of the bearing plate and part of the second surface; the second connector wraps part of the first surface, the first side surface of the bearing plate and part of the second surface; the first end of the first connector and the first end of the second connector are positioned on the first surface of the bearing plate; the second end of the first connector and the second end of the second connector are positioned on the second surface of the bearing plate.

In this embodiment, the one end of connector is located first surface for connect the coil, and the other end is located the second surface, is used for connecting the circuit board, from this, can conveniently assemble the circuit board with the coil pack through modes such as welding, improved switching power supply's packaging efficiency.

In one possible embodiment, the carrier comprises a first side and a second side which are arranged opposite to each other; wherein, the first side of the bearing plate is close to the outlet end of the coil, and the second side of the bearing plate is far away from the outlet end of the coil; the first connector wraps the first side surface and part of the second surface of the bearing plate; the second connector wraps the first side surface and part of the second surface of the bearing plate; the first end of the first connector and the first end of the second connector are at least partially positioned on the first side surface of the bearing plate; the second end of the first connector and the second end of the second connector are positioned on the second surface of the bearing plate.

In this embodiment, the one end of connector is located first surface for connecting the coil, and the other end is located the second surface, is used for connecting the circuit board, from this, can conveniently link together circuit board and coil, improved switching power supply's preparation efficiency.

In one possible embodiment, the coil assembly further comprises a first adhesive; the first bonding piece is used for bonding the coil to the first surface of the bearing plate.

In this embodiment, the coil is fixed to the carrier plate by means of adhesion, so that the stability of the operation of the transformer is improved.

In one possible embodiment, the coil assembly further comprises a second adhesive for securing the outgoing line of the coil to the first surface of the carrier plate.

In the embodiment, the outgoing line of the coil is fixed on the bearing plate in a bonding mode, so that the influence of unstable position of the outgoing line of the coil on the working performance of the transformer is avoided.

In one possible embodiment, the carrier plate further comprises a recess, and the coil is disposed in the recess.

In the embodiment, the coil is fixedly arranged in the groove of the bearing plate, so that the assembly efficiency of the coil assembly is improved, and the stability of the position of the coil on the bearing plate is ensured.

In one possible embodiment, the first surface of the carrier plate is provided with an adsorption area, and the adsorption area is positioned between two outgoing lines of the coil; the adsorption area is used for adsorbing the bearing plate by the assembly equipment.

In the embodiment, the bearing plate can be operated in an adsorption mode, so that the bearing plate can be conveniently sucked and discharged, and the automatic preparation efficiency is improved.

In one possible implementation manner, the circuit board further comprises a third through hole and a fourth through hole, wherein the third through hole and the fourth through hole are positioned at two sides of the first through hole, and the first through hole, the third through hole and the fourth through hole are arranged in a row; the magnetic core also comprises two side posts; one of the two side posts penetrates through the third through hole, and the other one penetrates through the fourth through hole.

In one possible embodiment, the transformer is a step-down transformer, the coil being used as a primary coil of the transformer, the PCB winding being used as a secondary coil of the transformer; wherein the number of turns of the coil is greater than the number of turns of the coil of the PCB winding.

The coil is used as the primary side of the transformer, and the litz wire is used for reducing the alternating current resistance of the coil so as to reduce the power loss of the primary side and further reduce the overall power loss of the switching power supply.

In a second aspect, a computing device is provided, the computing device comprising a switching power supply and a load as referred to in the first aspect and its various possible embodiments, the switching power supply being electrically connected to the load, the switching power supply being configured to power the load.

Drawings

FIG. 1 is a top view of a switching power supply provided in an embodiment of the present application;

FIG. 2 is a side view of the switching power supply of FIG. 1;

FIG. 3 is a top view of a carrier plate with coils assembled according to an embodiment of the present application;

FIG. 4A is a side view of the carrier plate of FIG. 3;

FIG. 4B is a side view of a carrier plate with coils assembled according to an embodiment of the present application;

FIG. 4C is a side view of a carrier plate with a coil mounted thereon according to an embodiment of the present application;

FIG. 4D is a side view of a carrier plate with coils assembled according to an embodiment of the present application;

fig. 5 is a preparation flow chart of a transformer applied to a switching power supply according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the embodiments. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more, but not all, embodiments" unless expressly specified otherwise.

Wherein, in the description of the embodiments of the present application, "/" means or is meant unless otherwise indicated, for example, a/B may represent a or B; "and/or" herein is merely an association relation describing associated objects, meaning that three relations may exist, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

In the description of the embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The computing devices such as the server, the switch and the computer comprise a switching power supply which supplies power to the load component, wherein the load comprises a fan, a main board, a network card and the like. The switching power supply can convert the input alternating voltage into the direct voltage required by the load at the later stage, and then output the power supply voltage to the load, so that the normal operation of the load is ensured.

High power density switching power supplies are sought after by the development of power electronics technology, and high power efficiency is required for energy conservation, environmental protection and cost conservation. Therefore, there is a need to continuously increase the power density and power efficiency of switching power supplies. Wherein, the power density refers to the ratio of the output power of the switching power supply to the volume of the switching power supply. The power supply efficiency may also be referred to as conversion efficiency, which refers to the ratio of the output power of the switching power supply to the power consumed by the switching power supply.

In one implementation, the switching power supply may include a dc-dc converter that may employ a planar transformer for voltage conversion. Both the primary and secondary sides of the planar transformer employ printed circuit board (printed circuit board, PCB) windings. The switching power supply of the scheme has high power density, can realize automatic processing and has high preparation efficiency. However, the flat transformer has a high ac resistance (alternating current resistance, ACR), resulting in a high transformer loss at high frequencies and a low power efficiency of the switching power supply.

In another implementation, the dc-dc converter may employ a wound transformer for voltage conversion. The primary side and the secondary side of the winding transformer are coils formed by winding a plurality of fine wires in parallel. The scheme has smaller ACR and high power efficiency. But the space utilization of this solution is lower, resulting in lower power density. In addition, the scheme needs manual preparation, and has low automation rate and low preparation efficiency.

Referring to fig. 1 and 2, a switching power supply 100 is provided in an embodiment of the present application, and the switching power supply 100 includes a circuit board 110, a coil assembly and a magnetic core 130. In the switching power supply 100, the circuit board 110 is provided with a through hole B1 and a PCB winding disposed around the through hole B1. Wherein the PCB windings are disposed within the circuit board 110.

Above the circuit board 110 is mounted a coil assembly comprising a coil 120, a carrier plate 124 and two connectors 1241. Wherein the connector may also be referred to as a pin. In addition, for convenience of description, one connector 1241 of the two connectors 1241 may be referred to as a connector 1241a, and the other connector as a connector 1241b. In addition, in the following description, when the connector 1241a and the connector 1241b are not particularly distinguished, they may be collectively referred to as a connector 1241.

The carrier plate 124 has a surface C1 and a surface C2 disposed opposite to each other, wherein the surface C2 faces the circuit board 110, and the coil 120 is disposed and fixed on the surface C1 of the carrier plate. The D1 end of the connector 1241a is linked with one end of the coil 120, and the D2 end is electrically connected with the circuit board 110. The D1 end of the connector 1241b is connected to the other end of the coil 120, and the D2 end is connected to the circuit board 110.

The carrier plate 134 has a through hole B2 disposed opposite to the through hole B1, and the coil 120 surrounds the through hole B2. The magnetic core 130 includes a center leg penetrating the through hole B2 and the through hole B2, so that the magnetic core 130, the coil 120, and the PCB winding constitute a transformer. In particular, one of the coil 120 and the PCB winding may be the primary side of the transformer and the other may be the secondary side of the transformer. For example, in a step-down transformer, coil 120 acts as the primary side coil and the PCB winding acts as the secondary side coil.

Next, a detailed description will be given of the solution provided in the embodiment of the present application.

With continued reference to fig. 1 and 2, the switching power supply 100 includes a circuit board 110. The circuit board may also be referred to as a printed circuit board or printed circuit board for carrying the electronic devices and providing electrical connection tracks for the electronic devices.

The circuit board 110 may include PCB windings. Wherein, the PCB winding is formed into a coil on one or more wiring layers in the inner layer of the circuit board, for example, when the wiring layers are copper layers, a plurality of turns of coils can be formed on one or more copper layers. To obtain a PCB winding with a set number of turns.

Through holes may be formed in the circuit board 110 corresponding to the middle region of the PCB winding, such that through holes B1 are formed in the middle region of the PCB winding, and the through holes B1 may allow a columnar magnetic core (e.g., a center pillar of the magnetic core 130) to pass therethrough, so that the magnetic core may pass through the PCB winding, so that the PCB winding is sleeved on the magnetic core.

With continued reference to fig. 1 and 2, the switching power supply 100 further includes a coil 120 mounted on the circuit board 110. The coil 120 may be wound from wire on a die set with a low ACR. In some embodiments, the coil 120 may be wound from litz wire. The litz wire is formed by connecting a plurality of mutually insulated wires in parallel. Litz wire turns result in coils 120 with lower ACR.

The coil 120 is assembled to the circuit board 110 after the circuit board 110 is prepared. That is, the circuit board 110 may be separately manufactured according to a manufacturing process of the circuit board, the coil 120 may be separately manufactured according to a manufacturing process of the coil, and then the two are assembled, so that the automatic assembly of the switching power supply 100 is easy to be realized, and the manufacturing efficiency may be improved.

In some embodiments, the coil 120 may be fabricated as a chip device that is mounted to the circuit board 110 by surface mount technology (surface mounted technology, SMT). For example, the coil 120 may be mounted on the circuit board 110 by attaching the coil 120 to the circuit board 110 using a chip mounter. Automated assembly of the coil 120 to the circuit board 110 is achieved.

In some embodiments, the coil 120 may form a coil assembly with the carrier plate 124 to be assembled on the circuit board 110 by the carrier plate 124 for automated assembly. In the switching power supply 100, the surface C2 of the carrier plate 124 contacts the circuit board 110, and the surface C1 carries the coil 120. That is, the coil 120 may be mounted on the surface C1 of the carrier plate 124, and the surface C2 of the carrier plate 124 and the circuit board 110 may be connected to fix the carrier plate 124 and the coil 120 to the circuit board 110.

Next, the respective constituent parts of the coil block will be specifically described.

The coil assembly includes a carrier plate 124 for mounting the coil 120. The carrier plate 124 has a through hole B2 at a position corresponding to the middle of the coil 120, and the through hole B2 allows the magnetic core having a columnar shape (for example, a center pillar of the magnetic core 130) to pass therethrough, so that the magnetic core can penetrate through the coil 120.

The carrier plate 124 is made of an insulating plate material having rigidity. The stiffness of the insulating board is that the bearing plate 124 is not deformed or slightly deformed under the gravity action of the coil 120. Wherein, the micro deformation refers to deformation that does not affect the assembly of the carrier plate 124 to the circuit board 110 by the automated equipment. In one example, the insulating board may be any one of a PCB board, a plastic board, and an epoxy board.

In one example, as shown in fig. 3 and shown, the carrier plate 124 has two connectors 1241 on a side remote from where the coil 120 is located. As described above, one of the two connection bodies 1241 may be referred to as a connection body 1241a and the other may be referred to as a connection body 1241b. Wherein, the connector 1241a is electrically connected to one output pin of the coil 120, and the connector 1241b is electrically connected to the other output pin of the coil 120. One of the two output pins of the coil 120 is one end of the coil 120, and the other output pin is the other end of the coil 120. Thereby, the coil 120 is made to form a loop. The pre-stage circuit may provide a voltage across the coil 120 through two pins 1241 and two output pins of the coil 120 to generate a current in the coil 120. The outlet of the coil may also be referred to as the outlet of the coil.

More specifically, as shown in fig. 4A, the connection body 1241 (i.e., the connection body 1241a and the connection body 1241 b) is formed in a U shape and is coated on a side of the carrier plate 124 where the coil 120 is located, such that a part of the connection body 1241 is located at the surface C1 of the carrier plate 124 and another part is located at the surface C2 of the carrier plate 124. The portion of the connector 1241 located on the surface C1 of the carrier 124 forms a D1 end of the connector 1241 for connecting the output pin of the coil 120. The portion of the connector 1241 located on the bottom (bottom) surface of the carrier plate 124 forms the D2 end of the connector 1241 for connecting to the front-stage circuit. More specifically, the D1 end of the connector 1241a is connected to one of the pins 120, and the D1 end of the connector 1241b is connected to the other pin 120. And both the connector 1241a and the connector 1241b are connected to the circuit board 110, and further connected to the front-stage circuit through the circuit board 110.

In one example, the D1 end of connector 1241 serves as a pad for connecting the pins of coil 120 by soldering. For example, as shown in FIG. 4A, the leg of coil 120 may be welded to the D1 end of connector 1241 to form a weld 1221. Thereby, the output pin of the coil 120 is connected to the connector 1241.

In one example, the D2 end of the connector 1241 serves as a pad for connecting the front-end circuit by soldering. For example, a PCB trace (not shown) connected to the front stage circuit is soldered to the D2 end of the connector 1241. Thereby, the connection body 1241 is connected to the front stage circuit.

In another example, as shown in fig. 4B, connector 1241 (i.e., connector 1241a and connector 1241B) is L-shaped. The L-shaped connector 1241 is attached to one side end of the carrier plate 124 away from the coil 120, such that one part of the L-shape is below the surface C2 of the carrier plate 124 and the other part is higher than the surface C1; alternatively, a portion of the L-shape is on the surface C1 of the carrier plate 124 and another portion is below the surface C2. The portion above or at the top (top) surface serves as the D1 end of the connector 1241, and is connected to the output pin of the connecting wire 120, for example, by welding. The portion at or below the bottom surface serves as the D2 terminal for forming a pad for connecting to the front-stage circuit. Thereby, the front-stage circuit can be connected to the coil 120 through the connection body 1241.

In yet another example, as shown in fig. 4C, the connector 1241 (i.e., connector 1241a and connector 1241 b) is cylindrical. The connector 1241 penetrates the carrier plate 124, wherein one end is above the top surface of the carrier plate 124, and the other end is below the bottom surface of the carrier plate 124. One end of the connector 1241 higher than the top surface of the carrier plate is used as a D1 end, and is connected to one lead of the coil 120, for example, by welding. One end of the connector 1241 lower than the carrier 124 is used as a D2 end for connecting to a pre-stage circuit.

In one example, as shown in fig. 3 and 4A-4D, the shape of the coil 120 may be fixed by a setting tape, and the shape-fixed coil 120 may be fixed to the carrier plate 124. In one example, the shape-fixed coil 120 may be bonded to the carrier plate 124 by a first adhesive. The first adhesive member may be dispensing. In one example, as shown in fig. 4D, the carrier plate 124 has a groove that can engage the coil 120. The coil 120 may be placed in the groove by an interference fit, creating a compressive force between the groove and the coil 120, thereby securing the coil 120 to the carrier plate 124.

In some embodiments, as shown in fig. 3, two connectors 1241 (i.e., connector 1241a and connector 1241 b) are positioned on carrier plate 124 and coil 120 is positioned on carrier plate 124 with a distance L1. The outgoing leg of the coil 120 is an outgoing line with a length not smaller than the distance L1. Illustratively, the outgoing line may be fixed to the carrier plate 124 by the second adhesive 123 to prevent the outgoing line from moving. The second adhesive 123 may be dispensing. There is a vacant area between the connection body 1241a and the connection body 1241b, the coil 120, and the two outgoing wires (i.e., outgoing pins) of the coil 120, and this vacant area may be used as an adsorption area 1242 for adsorbing the carrier plate 124 on which the coil 120 is mounted, thereby facilitating the mounting of the carrier plate 124 to the circuit board 110. For example, a vacuum cleaner head of an automated processing tool may act on the suction area 1242 to suck the carrier plate 124 so that the position of the carrier plate 124 may be moved, for example, to move the carrier plate 124 onto the circuit board 110.

In some embodiments, the carrier plate 124, on which the coil 120 is mounted, may be used as a chip device, and mounted to the circuit board 110 by SMT. For example, the carrier plate 124 on which the coil 120 is mounted may be used as a chip mounter, and the chip mounter (coil assembly) may be bonded to the circuit board 110.

With continued reference to fig. 1 and 2, the switching power supply 100 also includes a magnetic core 130. Magnetic core

The through hole in the middle area of the coil 120 corresponds to the through hole in the middle area of the PCB winding, and the columnar magnetic core may pass through the through hole in the middle area of the coil 120 and the through hole in the middle area of the PCB winding, that is, the magnetic core 130 penetrates through the PCB winding of the circuit board 110 and the coil 120, so that the PCB winding and the coil 120 are wound or sleeved on the columnar magnetic core.

In some embodiments, core 130 may be comprised of core 131 and core 132. The magnetic core 131 and the magnetic core 132 are E-shaped magnetic cores, the E-shaped magnetic cores comprise a middle column and two side columns, the middle column is located between the two side columns, and the middle column, the two side columns and the two side columns are connected into a whole through a magnetic core base. In the switching power supply 100, a core 131 and a core 132 are buckled to form a core 130. The magnetic core 132 may be located on the bottom surface side of the circuit board 110, and the magnetic core 132 is buckled to the circuit board 110 from the bottom surface of the circuit board 110. The core 132 may be located on a top side of the circuit board 110. The center leg of the core 132 and the center leg of the core 131 are snapped together and bonded together. The center leg of the core 132 and the side legs of the core 131 are snapped together and bonded together. The center leg of the

magnetic core

132 or 131 penetrates through the coil 120 and the PCB winding to wind or sleeve the coil 120 and the PCB winding on the magnetic core 130. In addition, the contact surfaces of the magnetic core 132 and/or the magnetic core 131 and the circuit board 110 may be covered with glue, so that the magnetic core 132 and/or the magnetic core 131 and the circuit board 110 are bonded together.

In one example of this embodiment, the circuit board 110 also has a through hole B3 located at one side of the through hole B1, and a through hole B4 located at the other side of the through hole B1. The through holes B3, B1 and B4 are arranged in a row and are sequentially arranged. Through hole B3, through B1, through B4 respectively with the shape cooperation of a side post, center pillar, the other side post of E type magnetic core 131 (or magnetic core 132) for a side post of magnetic core 131 (or magnetic core 132) can run through hole B3, and the center pillar can run through hole B1, and another side post can run through hole B2, thereby realizes the butt joint of magnetic core 131 and magnetic core 132.

In one example of this embodiment, after core 131 and core 132 are snapped together, carrier 124 is positioned between the two legs of core 131 or core 132. That is, the two legs of the core 131 and the core 132 are engaged with each other on the outer side of the carrier plate 124.

In one example of this example, the carrier plate 124 also has a through hole B5 located at one side of the through hole B12, and a through hole B6 located at the other side of the through hole B2. The through holes B5, B2 and B6 are arranged in a row and are sequentially arranged. Through hole B5, through B2, through B6 respectively with the shape cooperation of a side post, center pillar, the other side post of E type magnetic core 131 (or magnetic core 132) for a side post of magnetic core 131 (or magnetic core 132) can run through hole B5, and the center pillar can run through hole B2, and the other side post can run through hole B6, thereby realizes the butt joint of magnetic core 131 and magnetic core 132.

The foregoing is merely illustrative of the implementation of the magnetic core 130 and the manner of assembly to the switching power supply 100, and is not particularly limiting. In other embodiments, the core 130 may be in other forms, such as an E-shaped core for one of the two opposing cores and an I-shaped core for the other. At this time, the center leg of the E-shaped core may penetrate the coil 120 and the PCB winding to wind or sheath the coil 120 and the PCB winding on the core 130.

Thus, the core 130, the coil 120, and the PCB windings in the circuit board 110 may constitute the transformer A1. The coil 120 may be used as a primary side of the transformer A1, and the PCB winding in the circuit board 110 may be used as a secondary side of the transformer A1.

The primary side of the transformer may also be referred to as the primary winding and the secondary side of the transformer may also be referred to as the secondary winding. The primary winding may be connected to a power source to generate a current. Under the action of the current in the primary winding, the magnetic core generates an alternating magnetic field. Under the action of alternating magnetic field, the secondary winding generates current. Thereby effecting transfer of energy from the primary winding to the secondary winding.

The coil 120 has a lower ACR relative to the PCB windings. Coil 120 is employed as the primary winding of transformer A1 in switching power supply 100. The transformer A1 has a lower ac resistance than a transformer in which both the primary winding and the secondary winding are PCB windings, thereby enabling the switching power supply 100 to have lower power loss and higher power efficiency.

And the PCB winding is directly manufactured on the circuit board, so that the space utilization rate is high. The use of the PCB winding as the secondary winding of the transformer A1 in the switching power supply 100 helps to reduce the volume of the switching power supply 100.

Further, since the PCB winding is fabricated inside the circuit board, the PCB winding is directly connected to the wiring on the circuit board, rather than being connected through other wires, so that the dc resistance between the PCB winding and the wiring on the circuit board is small. By adopting the PCB winding as the secondary winding of the transformer A1 in the switching power supply 100, the dc resistance between the transformer A1 and the wiring on the circuit board 110 can be reduced, so as to further reduce the power loss of the switching power supply 100.

In some embodiments, when transformer A1 is a step-down transformer, i.e., the number of turns of the primary winding is greater than the number of turns of the secondary winding. In this case, the number of turns of the coil 120 is greater than that of the PCB winding, the coil 120 is used as the primary winding of the transformer A1, and the PCB winding is used as the secondary winding of the transformer A1. The more turns of the winding, the greater the losses due to ACR of the winding. In the case where the number of turns of the primary winding is smaller than that of the secondary winding, the use of the coil 120 with a smaller ACR as the primary winding can significantly reduce the overall power loss of the switching power supply 100.

Referring to fig. 5, the present embodiment provides a preparation flow of a transformer applied to a switching power supply: the process may include the following steps.

Step 501, a circuit board 110 containing PCB windings is prepared.

Copper may be applied to the circuit board in the form of a coil and the turns of the coil are insulated from one another to provide the circuit board 110 with PCB windings. In some embodiments, the circuit board may include multiple layers. Copper may be applied to all or part of the layers in the multilayer to obtain a PCB winding with a set number of turns.

A through hole may be punched in the circuit board 110 corresponding to the middle region of the PCB winding to form a through hole B1. The through holes B1 allow the columnar magnetic core to pass through, so that the magnetic core can penetrate through the PCB winding, and the PCB winding is sleeved on the magnetic core.

Step 502, the coil 120 is mounted on the circuit board 110.

A wire (e.g., litz wire) may be wound on the mold to obtain the coil 120, as desired. After the coil 120 is removed from the mold, the shape of the coil may be fixed by a setting tape.

In some embodiments, the coil 120 may be mounted to the circuit board 110 by means of adhesive soldering. In some embodiments, the coil 120 may be mounted to the circuit board 110 by SMT as a patch to the circuit board. For example, the coil 120 may be attached to the circuit board 110 by a chip mounter using the coil as a chip of the circuit board. In some embodiments, the coil 120 may be fixed to the carrier plate 124, and then the coil 120 is mounted to the circuit board 110 by mounting the carrier plate 124 to the circuit board 110. Reference is made in particular to the description of the embodiment shown in fig. 3 and 4D, which is not repeated here. The foregoing manner allows for automated assembly of the coil to the circuit board.

In some embodiments, the pre-configured inverter circuit 140 and/or rectifier circuit 150 may be mounted to the circuit board 110. For example, the inverter circuit 140 and/or the rectifier circuit 150 may be mounted to the circuit board 110 in the form of a patch by SMT. For example, the inverter circuit 140 and/or the rectifier circuit 150 may be attached to the circuit board 110 using a chip mounter. Automatic assembly of the inverter circuit and/or the rectifier circuit to the circuit board is achieved.

In step 503, a magnetic core 130 is inserted through the coil 120 and the PCB winding and mounted on the circuit board 110.

In some embodiments, core 130 may be comprised of core 131 and core 132. Wherein, magnetic core 131 and magnetic core 132 are both E-shaped. The core 132 may be snapped onto the circuit board 110 from the bottom surface of the circuit board 110 and the core 132 may be snapped onto the circuit board 110 from the top surface of the circuit board 110. Wherein the center leg of the magnetic core 132 and the center leg of the magnetic core 131 are buckled and bonded together, for example, by an adhesive. The center leg of the core 132 and the side legs of the core 131 are snapped together and bonded together, such as by an adhesive. The center leg of the

magnetic core

In some embodiments, the magnetic core 130 may be type I. The I-shaped core 130 may be wound with the coil 120 and PCB windings to wind or nest the coil 120 and PCB windings on the core 130.

Thus, the switching power supply 100 can be manufactured.

All steps in the preparation process can be finished through automatic processing, so that the preparation efficiency of the switching power supply is improved. And the prepared switching power supply has smaller volume, so that the switching power supply has higher power density. And the prepared switching power supply has low power loss and higher power efficiency. Specifically, for the current flat transformer switching power supply that can automated processing, the switching power supply that this application embodiment prepared can improve power efficiency to can realize higher energy efficiency level.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A switching power supply, comprising: a circuit board and a transformer; the transformer comprises a PCB winding, a coil assembly and a magnetic core;

the circuit board is provided with a first through hole; the PCB winding is arranged in the circuit board around the first through hole;

the coil assembly is arranged above the circuit board and comprises a coil, a bearing plate, a first connector and a second connector;

the bearing plate comprises a first surface and a second surface which are oppositely arranged; the second surface faces the circuit board;

the coil is fixedly arranged on the first surface of the bearing plate around the second through hole; wherein the coil is formed by winding a wire;

the first connector and the second connector are at least partially arranged on the second surface of the bearing plate; the first connector and the second connector respectively comprise a first end and a second end; the first end of the first connector is electrically connected with one end of the coil, and the second end of the first connector is electrically connected with the circuit board; the first end of the second connector is electrically connected with the other end of the coil, and the second end of the second connector is electrically connected with the circuit board;

the first through hole and the second through hole are oppositely arranged;

the magnetic core comprises a center post; the center pillar penetrates through the first through hole and the second through hole.

2. The switching power supply of claim 1, wherein the carrier plate includes two connection through holes; the first connecting body penetrates through the bearing plate through one connecting through hole; the second connector penetrates through the bearing plate through the other connecting through hole;

the first end of the first connector and the first end of the second connector are convexly arranged on the first surface of the bearing plate; the second end of the first connector and the second end of the second connector are convexly arranged on the second surface of the bearing plate.

3. The switching power supply of claim 1 wherein said carrier plate includes oppositely disposed first and second sides; the first side and the second side are located between the first surface and the second surface; the first side surface of the bearing plate is close to the wire outlet end of the coil, and the second side surface of the bearing plate is far away from the wire outlet end of the coil;

the first connector wraps part of the first surface, the first side surface of the bearing plate and part of the second surface; the second connector wraps part of the first surface, the first side surface of the bearing plate and part of the second surface;

the first end of the first connector and the first end of the second connector are positioned on the first surface of the bearing plate; the second end of the first connector and the second end of the second connector are positioned on the second surface of the bearing plate.

4. The switching power supply of claim 1 wherein said carrier plate includes oppositely disposed first and second sides; the first side surface of the bearing plate is close to the wire outlet end of the coil, and the second side surface of the bearing plate is far away from the wire outlet end of the coil;

the first connector wraps the first side surface of the bearing plate and part of the second surface;

the second connector wraps the first side surface of the bearing plate and part of the second surface;

wherein the first end of the first connector and the first end of the second connector are at least partially located on the first side surface of the bearing plate; the second end of the first connector and the second end of the second connector are positioned on the second surface of the bearing plate.

5. The switching power supply of any one of claims 1-4 wherein said coil assembly further comprises a first adhesive; the first bonding piece is used for bonding the coil to the first surface of the bearing plate.

6. The switching power supply of any one of claims 1-4 wherein the coil assembly further comprises a second adhesive for securing the outgoing line of the coil to the first surface of the carrier plate.

7. The switching power supply of claim 5, wherein the carrier plate further comprises a recess, the coil being disposed within the recess.

8. The switching power supply according to claim 7, wherein the first surface of the carrier plate is provided with an adsorption area, the adsorption area being located between two outgoing lines of the coil; the adsorption area is used for adsorbing the bearing plate by the assembly equipment.

9. The switching power supply of claim 8, wherein the circuit board further comprises a third through hole and a fourth through hole, the third through hole and the fourth through hole are positioned at two sides of the first through hole, and the first through hole, the third through hole and the fourth through hole are arranged in a row; the magnetic core further comprises two side posts; one of the two side posts penetrates through the third through hole, and the other penetrates through the fourth through hole.

10. The switching power supply of claim 9 wherein said transformer is a step-down transformer, said coil serving as a primary winding of said transformer; the PCB winding is used as a secondary winding of the transformer; wherein the number of turns of the coil is greater than the number of turns of the coil of the PCB winding.

11. The switching power supply of claim 10 wherein said coil is litz wire.

12. A computing device, characterized by: the computing device comprising a switching power supply and a load according to any one of claims 1-11, the switching power supply and the load being electrically connected, the switching power supply being operable to power the load.