WO2023098594A1

WO2023098594A1 - Planar magnetic device and wiring method

Info

Publication number: WO2023098594A1
Application number: PCT/CN2022/134460
Authority: WO
Inventors: 廖胜峰; 任文
Original assignee: 广州视源电子科技股份有限公司
Priority date: 2021-12-01
Filing date: 2022-11-25
Publication date: 2023-06-08
Also published as: CN116206869A

Abstract

Embodiments of the present disclosure relate to the technical field of electronics. Disclosed are a planar magnetic device and a wiring method. The planar magnetic device comprises: a side column, a first air gap being disposed on the side column; a middle column parallel to the side column, a second air gap being provided on the middle column; and a coil winding wound on the middle column, the wire width of the coil winding close to the first air gap or the second air gap being small, and the wire width of the coil winding away from the first air gap and the second air gap being wide. Therefore, the embodiments of the present disclosure can solve the problem in the prior art of large loss of the planar magnetic device.

Description

Planar magnetic device and wiring method

This disclosure claims the priority of the Chinese patent application with the application number 202111456377.4 and the title of the invention "Planar Magnetic Device and Wiring Method" filed with the China Patent Office on December 01, 2021, the entire contents of which are incorporated by reference in this disclosure.

technical field

The present disclosure relates to the field of electronics, in particular, to a planar magnetic device and a wiring method.

Background technique

Nowadays, electronic products in all walks of life are inseparable from the use of switching power supplies. The key device that affects the size of the switching power supply is the magnetic device. In order to miniaturize the switching power supply, planar magnetic devices can be used. Due to the thin thickness of the planar magnetic device, the height of the magnetic core in the planar magnetic device is limited. Fig. 1 is a schematic diagram of a magnetic flux trend according to the prior art. As shown in Figure 1, an air gap is generally opened on the magnetic core to store large magnetic flux energy, the main magnetic flux 111 passing through the magnetic core, and the diffusion magnetic flux 222 that diffuses into the window, passing through the magnetic columns The bypass magnetic flux 333 is the bypass magnetic flux 333. Since the magnetic flux is a closed curve, when passing through the air gap, some magnetic force lines will disperse into the core window, and the diffuse magnetic flux 222 will cut the winding coil placed in the window, and the winding coil An alternating current is fed inside, causing the alternating current to cut the magnetic field lines of the diffused magnetic flux 222 , resulting in loss. Moreover, the larger the air gap, the more diffused magnetic flux, resulting in greater loss.

Contents of the invention

Embodiments of the present disclosure provide a planar magnetic device and a wiring method, so as to at least solve the technical problem of high loss in the existing planar magnetic device.

According to an aspect of an embodiment of the present disclosure, a planar magnetic device is provided, including: a side column, a first air gap is provided on the side column; a middle column, parallel to the side column, a second air gap is provided on the center column; The coil windings are wound on the center column, and the coil windings close to the first air gap or the second air gap have a small line width, and the coil windings far away from the first air gap and the second air gap have a large line width.

Optionally, the first line width of the coil winding wound at the first position is smaller than the second line width of the coil winding wound at the second position, wherein the first distance between the first position and the second air gap is smaller than the distance between the second position and the second air gap. The second distance of the second air gap.

Optionally, the line width is determined based on the first distance between the coil winding and the first air gap, the second distance between the coil winding and the second air gap, the current flowing through the coil winding, and the loss of the planar magnetic device.

Optionally, when the first distance is less than the second distance, the line width is determined based on the first distance, current and loss; when the first distance is greater than the second distance, the line width is determined based on the second distance, current and loss Sure.

Optionally, the first air gap and the second air gap are set opposite to each other.

According to another aspect of the embodiments of the present disclosure, there is also provided a wiring method, which is applied to any of the above-mentioned planar magnetic devices. The wiring method includes: obtaining the current flowing through the coil winding, and the loss of the planar magnetic device; based on the current and Loss, determine the line width of the coil winding at different positions on the center column; wind the coil winding on the center column according to the line width at different positions.

Optionally, based on the current and the loss, determining the line width of the coil winding at different positions on the center column includes: determining multiple positions where the coil winding is wound on the center column; determining a first distance between each position and the first air gap, The second distance between each position and the second air gap; solving the objective function based on the first distance or the second distance, current and loss, to obtain line widths at different positions.

Optionally, solving the objective function based on the first distance or the second distance, current and loss, and obtaining the line width at different positions includes: in response to the first distance being smaller than the second distance, solving the objective function based on the first distance, current and loss, Get the line width at different positions.

Optionally, solving the objective function based on the first distance or the second distance, current and loss, and obtaining the line width at different positions includes: in response to the first distance being greater than the second distance, solving the objective function based on the first distance, current and loss, Get the line width at different positions.

Optionally, the wiring method further includes: obtaining the product of the resistivity of the coil winding, the square of the current and the skin effect coefficient to obtain the first product, and obtaining the ratio of the first product to the line width to obtain the skin effect loss function; Obtain the product of the line width, resistivity, number of turns of the coil winding, the square of the current, and the proximity effect coefficient to obtain the second product, and obtain the ratio of the second product to the square of the first distance or the second distance to obtain the proximity effect loss Function; obtain the weighted sum of the skin effect loss function and the proximity effect loss function to obtain the objective function.

According to another aspect of the embodiments of the present disclosure, there is also provided a wiring device, which is applied to any of the above-mentioned planar magnetic devices, and the device includes: an acquisition component, configured to acquire the current flowing through the coil winding, and the loss of the planar magnetic device ;Determination component, set to determine the line width of the coil winding at different positions on the center column based on current and loss; winding component, set to wind the coil winding on the center column according to the line width at different positions.

According to another aspect of the embodiments of the present disclosure, there is also provided a non-volatile storage medium, the non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing any one of the above wiring methods step.

According to another aspect of the embodiments of the present disclosure, there is also provided an electronic device, including: a processor and a memory; wherein, the memory stores a computer program, and the computer program is suitable for being loaded by the processor and executing any one of the above wiring method steps .

In an embodiment of the present disclosure, a planar magnetic device is provided, comprising: a side column, a first air gap is provided on the side column; a middle column, parallel to the side column, a second air gap is provided on the center column; a coil winding , wound on the central column, and the coil winding near the first air gap or the second air gap has a small line width, and the coil winding far away from the first air gap and the second air gap has a large line width. It should be noted that the windings close to the air gap can appropriately reduce the line width, while the windings away from the air gap can appropriately increase the line width, achieving the technical effect of effectively reducing the total AC loss, and then solving the existing The technical problem of large loss in planar magnetic devices.

Description of drawings

The drawings described here are used to provide a further understanding of the present disclosure, and constitute a part of the present disclosure. The schematic embodiments of the present disclosure and their descriptions are used to explain the present disclosure, and do not constitute improper limitations to the present disclosure. In the attached picture:

Fig. 1 is a schematic diagram of a magnetic flux trend according to the prior art;

2 is a schematic diagram of a planar magnetic device according to the prior art;

3 is a schematic diagram of a planar magnetic device according to an embodiment of the present disclosure;

4 is a schematic diagram of the AC resistance comparison curves of a planar magnetic device and a traditional planar magnetic device according to an embodiment of the present disclosure;

FIG. 5 is a flowchart of an optional wiring method according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of an optional wiring device according to an embodiment of the present disclosure;

Fig. 7 is a schematic structural diagram of a non-volatile storage medium according to an embodiment of the present disclosure;

Fig. 8 is a schematic diagram of an optional electronic device according to an embodiment of the present disclosure.

Detailed ways

In order to enable those skilled in the art to better understand the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only It is an embodiment of a part of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present disclosure.

When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

It should be noted that the terms "first" and "second" in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, eg, a process, method, system, product, or device comprising a series of steps or components need not be limited to the expressly listed Instead, other steps or components not explicitly listed or inherent to the process, method, product or apparatus may be included. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship.

In order to reduce the influence of diffused magnetic flux on the coil windings in existing planar magnetic devices, Fig. 2 is a schematic diagram of a planar magnetic device according to the prior art, as shown in Fig. 2, one of the methods for planar magnetic devices is to Both the column 201 and the side column 202 have air gaps, which are respectively the middle column air gap 2011 and the side column air gap 2021, and the coil winding 203 is wound on the center column 201, which can make the height of the air gap become half of the original, thereby Effectively reduce the influence of the diffusion flux.

However, the above-mentioned planar magnetic device has the following disadvantages: First, although the length of the air gap becomes half of the original, because the diffusion flux not only diffuses through the air gap of the central column, but also diffuses through the air gap of the side column, The contact area between the coil winding and the diffusion magnetic flux is increased, and the range of the coil winding affected by the diffusion magnetic flux becomes larger, which will also cause the problem of large loss; secondly, the area of the coil winding due to the diffusion magnetic flux cutting is not considered. Eddy current loss.

An embodiment of the present disclosure provides a planar magnetic device. FIG. 3 is a schematic diagram of a planar magnetic device according to an embodiment of the present disclosure. As shown in FIG. 3 , it includes: a side column 301, and a first air gap is provided on the side column 3011; the central column 302 is parallel to the side column 301, and the central column 302 is provided with a second air gap 3021; the coil winding 303 is wound on the central column 302 and is close to the coil winding of the first air gap or the second air gap The line width is small, and the line width of the coil winding away from the first air gap and the second air gap is large.

It should be noted that Fig. 3 shows the longitudinal section of the right part of the planar magnetic device. A three-dimensional planar magnetic device can be obtained by rotating the leftmost vertical direction in the figure as the axis. As shown in Fig. 3, the center column It can be located at the center of the planar magnetic device, the side columns can be located around the center column, the coil windings are wound on the center column, and the wires are isolated by insulating substances.

Side post in the above-mentioned steps, center post and coil winding can be existing side post, center post and coil winding, and the line width of the winding of above-mentioned step can be different, for example, close to air gap (the first air gap or the second The windings with two air gaps) can appropriately reduce the line width, and the windings away from the air gap (the first air gap and the second air gap) can appropriately increase the line width, and the total AC loss can be effectively reduced by setting different line widths .

In an optional embodiment, according to the law of electromagnetic induction, if the width of the coil closer to the air gap is larger, then there will be more lines of magnetic force cutting the coil body, resulting in more eddy currents, so that the coil loss increases. The coil far away from the air gap is weakly cut by the magnetic field lines, so appropriately increasing its line width can effectively reduce the DC loss of this part and the skin loss in the AC loss. Therefore, the overall AC loss can be minimized.

In an optional embodiment, the line width of the coil winding can be determined by the first distance between the position of the coil winding and the first air gap of the side column, and the second distance between the second air gap of the center column and the flow through The current in the coil winding and the losses in the planar magnetic device are jointly determined.

In an optional embodiment, the first distance between the position of the coil winding and the first air gap of the side column is compared with the second distance between the position of the coil winding and the second air gap of the center column, when When the first distance is smaller than the second distance, the line width can be determined based on the first distance, current and loss; when the first distance is greater than the second distance, the line width can be determined based on the second distance, current and loss.

In an optional embodiment, assuming that the current flowing through the coil winding is I _p and the line width of the coil winding is W _p , according to Maxwell's equations, the AC loss generated by the skin effect of the coil winding is shown in formula 2- 1. The AC loss caused by the proximity effect is shown in formula 2-2, and the formula is as follows:

Among them, W _p is the line width of the coil winding; ρ is the resistivity of the copper wire; l _p is the distance between the winding and the air gap (including the first air gap and the second air gap), and m _p is the number of turns of the coil winding. K _s1 and K _s2 are skin effect coefficients and proximity effect coefficients. These parameters are related to parameters such as magnetic permeability and operating frequency. If the magnetic core is fixed and the operating frequency is fixed, this value is a fixed value.

From formula 2-1 to formula 2-2, it can be seen that for AC loss, it is composed of skin effect loss and proximity effect loss. In the composition of proximity effect loss, the influence of the winding coil far away from the air gap will be superimposed on the close On the winding coil of the air gap, the coil winding closest to the air gap has a greater impact, because _lp will be relatively small, and the loss of this part will account for a larger proportion of the total loss. Therefore, the line width of each layer plays a large role, and the total AC loss of the coil winding is P1 _ac for the coil winding close to the first air gap, because the coil winding to the first leg of the core side The distance l _p of the air gap is small, so the loss caused by the proximity effect will account for a large proportion, so appropriately reducing the line width W _p of the coil winding can effectively reduce the total AC loss; for the coil close to the second air gap For the winding, the total AC loss of the coil winding is P2 _ac , because the distance _lp between the coil winding and the second air gap of the core column is small, so the loss caused by the proximity effect will account for a large proportion, so it is appropriate Reducing the line width W _p of the coil winding can effectively reduce the total AC loss; for the coil winding that is not close to the first air gap and the second air gap, because the coil winding is connected to the first air gap and the second air gap The distances are relatively large, so the loss caused by the proximity effect accounts for a relatively small proportion, so appropriately increasing the line width W _p of the coil winding can effectively reduce the total AC loss.

By setting the width of the coil winding according to the distance from the first air gap and the second air gap, the line width of the coil winding closer to the first air gap or the second air gap is ensured to be smaller, and the distance from the first air gap is smaller. The farther the air gap and the second air gap are, the larger the line width of the coil winding is, and at the same time, the measurable loss is realized.

4 is a schematic diagram of the AC resistance comparison curves of the planar magnetic device and the traditional planar magnetic device provided according to the embodiment of the present disclosure. As shown in FIG. It can be seen that the AC resistance of the bilateral asymmetric winding will be much smaller than the traditional scheme, especially in the high frequency part, the AC resistance of the bilateral asymmetric winding will be much smaller than the traditional scheme. In Fig. 4, the abscissa is frequency (unit Hz), and the ordinate is AC resistance (unit mohm). This figure verifies the correctness of the theoretical analysis.

In an embodiment of the present disclosure, a planar magnetic device is provided, comprising: a side column, a first air gap is provided on the side column; a middle column, parallel to the side column, a second air gap is provided on the center column; a coil winding , wound on the central column, and the coil winding near the first air gap or the second air gap has a small line width, and the coil winding far away from the first air gap and the second air gap has a large line width. It should be noted that there are air gaps on the center column and the side column of the planar magnetic device, and the distance from the air gap is different, and the line width of the coil winding is different, thereby reducing the contact area between the coil winding and the diffused magnetic flux, achieving The technical effect of effectively reducing the total AC loss is obtained, and then the technical problem of large loss in the planar magnetic device in the related art is solved.

According to another aspect of the embodiments of the present disclosure, a wiring method is also provided, which is applied to the planar magnetic device summarized in the above-mentioned embodiment 1. See the above-mentioned embodiments for preferred implementation modes and scenarios, and details will not be repeated here. FIG. 5 is a flowchart of an optional wiring method according to an embodiment of the present disclosure. As shown in FIG. 5, the wiring method includes:

Step S502, obtaining the current flowing through the coil winding and the loss of the planar magnetic device;

The current in the above steps is the current flowing through the coil winding.

Step S504, based on the current and loss, determine the line width of the coil winding at different positions on the center column;

Step S506, winding the coil winding on the center column according to the line width at different positions.

Optionally, based on the current and loss, determining the winding manner of the coil winding on the center column includes: determining a plurality of positions where the coil winding is wound on the center column; determining a first distance between each position and the first air gap, each The second distance between the position and the second air gap; the objective function is solved based on the first distance or the second distance, current and loss to obtain line widths at different positions.

The objective function of the above steps can be seen in the above embodiments, and will not be repeated here.

Optionally, the wiring method further includes: in response to the first distance being smaller than the second distance, solving an objective function based on the first distance, current and loss to obtain line widths at different positions.

Optionally, the wiring method further includes: in response to the first distance being greater than the second distance, solving an objective function based on the first distance, current and loss to obtain line widths at different positions.

According to another aspect of the embodiments of the present disclosure, a wiring device is also provided, which is applied to any of the above-mentioned planar magnetic devices. FIG. 6 is a schematic structural diagram of an optional wiring device according to an embodiment of the present disclosure, as shown in FIG. 6, the device includes: an acquisition component 62, configured to acquire the current flowing through the coil winding, and the loss of the planar magnetic device; a determination component 64, configured to determine the coil winding at different positions on the center column based on the current and loss Wire width: the winding component 66 is configured to wind the coil winding on the center column according to the wire width at different positions.

An embodiment of the present disclosure also provides a non-volatile storage medium. The non-volatile storage medium can store a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the method steps of the above-mentioned embodiment shown in FIG. 5 , For the specific execution process, reference may be made to the specific description of the embodiment shown in FIG. 5 , and details are not repeated here.

The device where the non-volatile storage medium is located may be an electronic device.

Each functional component provided by the embodiments of the present disclosure may run in a planar magnetic device or a similar computing device, and may also be stored as a part of a non-volatile storage medium.

Fig. 7 is a schematic structural diagram of a non-volatile storage medium according to an embodiment of the present disclosure. As shown in FIG. 7 , a program product 70 according to an embodiment of the present disclosure is described, on which a computer program is stored, and when the computer program is executed by a processor, the program code that implements the following steps:

Obtain the current flowing through the coil winding, and the loss of the planar magnetic device;

Determining the line width of the coil winding at different positions on the center post based on current and losses;

Wind the coil windings on the center column according to the wire width at different positions.

Optionally, when the computer program is executed by the processor, the program code for realizing the following steps: determine a plurality of positions where the coil winding is wound on the center column; determine the first distance between each position and the first air gap, and each position The second distance from the second air gap; solve the objective function based on the first distance or the second distance, current and loss, and obtain the line width at different positions.

Optionally, when the computer program is executed by the processor, the following steps are implemented: in response to the first distance being smaller than the second distance, solving the objective function based on the first distance, current and loss to obtain line widths at different positions.

Optionally, when the computer program is executed by the processor, the following steps are implemented: in response to the first distance being greater than the second distance, solving the objective function based on the first distance, current and loss to obtain line widths at different positions.

Optionally, when the computer program is executed by the processor, the program code that implements the following steps: obtain the product of the resistivity of the coil winding, the square of the current and the skin effect coefficient, obtain the first product, and obtain the first product and the line width The ratio of the skin effect loss function is obtained; the product of the line width, resistivity, the number of turns of the coil winding, the square of the current and the proximity effect coefficient is obtained to obtain the second product, and the second product and the first distance or the second The ratio of the square of the distance is used to obtain the proximity effect loss function; the weighted sum of the skin effect loss function and the proximity effect loss function is obtained to obtain the objective function.

Optionally, in this embodiment, the non-volatile storage medium may also be configured as program codes of various preferred or optional method steps provided by the wiring method.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments, and details are not repeated in this embodiment.

Non-volatile storage media may include a data signal carrying readable program code in baseband or as part of a carrier wave traveling as a data signal. Such propagated data signals may take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A non-volatile storage medium may send, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

The program code contained in the non-volatile storage medium can be transmitted by any appropriate medium, including but not limited to wireless, cable, optical cable, radio frequency, etc., or any suitable combination of the above.

An embodiment of the present disclosure also provides an electronic device. FIG. 8 is a schematic diagram of an optional electronic device according to an embodiment of the present disclosure. As shown in FIG. 8 , the electronic device 1000 may include: at least one processor 1001, at least A network interface 1004, a user interface 1003, a memory 1005, and at least one communication bus 1002.

Wherein, the communication bus 1002 is used to realize connection and communication between these components.

Wherein, the user interface 1003 may include a display screen (Display) and a camera (Camera), and the optional user interface 1003 may also include a standard wired interface and a wireless interface.

Wherein, the network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).

Wherein, the processor 1001 may include one or more processing cores. The processor 1001 uses various interfaces and lines to connect various parts of the entire electronic device 1000, and executes or executes by running or executing instructions, programs, code sets or instruction sets stored in the memory 1005, and calling data stored in the memory 1005. Various functions of the electronic device 1000 and processing data. Optionally, the processor 1001 may adopt at least one of Digital Signal Processing (Digital Signal Processing, DSP), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), and Programmable Logic Array (Programmable Logic Array, PLA). implemented in the form of hardware. The processor 1001 may integrate one or a combination of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU) and a modem. Among them, the CPU mainly handles the operating system, user interface and application programs, etc.; the GPU is used to render and draw the content that needs to be displayed on the display screen; the modem is used to handle wireless communication. It can be understood that the above modem may also not be integrated into the processor 1001, but implemented by a single chip.

Wherein, the memory 1005 may include a random access memory (Random Access Memory, RAM), and may also include a read-only memory (Read-Only Memory). Optionally, the memory 1005 includes a non-transitory computer-readable storage medium (non-transitory computer-readable storage medium). The memory 1005 may be used to store instructions, programs, codes, sets of codes or sets of instructions. The memory 1005 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), Instructions, etc. used to implement the above method embodiments; the storage data area can store data, etc. involved in the above method embodiments. Optionally, the memory 1005 may also be at least one storage device located away from the aforementioned processor 1001 . As shown in FIG. 8 , the memory 1005 as a computer storage medium may include an operating system, a network communication component, a user interface component, and an operating application program of the electronic device.

In the electronic device 1000 shown in FIG. 8 , the user interface 1003 is mainly used to provide the user with an input interface to obtain the data input by the user; and the processor 1001 can be used to call the operation application program of the electronic device stored in the memory 1005, And specifically perform the following operations: obtain the current flowing through the coil winding and the loss of the planar magnetic device; determine the line width of the coil winding at different positions on the center column based on the current and loss; wind the coil winding on the center column according to the line width of different positions on the center pillar

In one embodiment, the operating system of the electronic device is an Android system. In the Android system, the processor 1001 also performs the following steps: based on the current and loss, determining the line width of the coil winding at different positions on the center column includes: determining the coil winding Wrap multiple locations on the center post; determine the target distance from each location to the second air gap; solve the objective function based on the target distance, current, and loss to get the line width at different locations.

In one embodiment, the processor 1001 further executes the following step: in response to the first distance being smaller than the second distance, solving an objective function based on the first distance, current and loss to obtain line widths at different positions.

In one embodiment, the processor 1001 further performs the following steps: obtain the product of the resistivity of the coil winding, the square of the current and the skin effect coefficient to obtain the first product, and obtain the ratio of the first product to the line width to obtain the set Skin effect loss function; obtain the product of the line width, resistivity, number of turns of the coil winding, the square of the current and the proximity effect coefficient to obtain the second product, and obtain the ratio of the second product to the square of the target distance to obtain the proximity effect loss Function; obtain the weighted sum of the skin effect loss function and the proximity effect loss function to obtain the objective function.

Those skilled in the art should understand that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Accordingly, the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-permanent storage in computer readable media, in the form of random access memory (RAM) and/or nonvolatile memory such as read only memory (ROM) or flash RAM. The memory is an example of a computer readable medium.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, components of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above are merely examples of the present disclosure, and are not intended to limit the present disclosure. Various modifications and changes to the present disclosure will occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the scope of the claims of the present disclosure.

Industrial Applicability

The solution provided by the embodiments of the present disclosure can be applied to the wiring process to obtain the current flowing through the coil winding and the loss of the planar magnetic device; based on the current and loss, determine the line width of the coil winding at different positions on the center column; according to different The line width of the position winds the coil winding on the center column, thereby achieving the technical effect of effectively reducing the total AC loss and solving the technical problem of large loss in the existing planar magnetic devices.

Claims

A planar magnetic device comprising:

A side column, the side column is provided with a first air gap;

The middle column is parallel to the side column, and the second air gap is arranged on the middle column;

a coil winding wound on the center column, and the coil winding near the first air gap or the second air gap has a small line width, and is far away from the first air gap and the second air gap The line width of the coil winding of the gap is large.
The planar magnetic device of claim 1, wherein the line width is based on a first distance of the coil winding from the first air gap, a second distance of the coil winding from the second air gap, The current flowing through the coil windings, and the losses of the planar magnetic device are determined.
The planar magnetic device according to claim 2, wherein,

In the case where the first distance is less than the second distance, the line width is determined based on the first distance, the current and the loss;

If the first distance is greater than the second distance, the line width is determined based on the second distance, the current and the loss.
The planar magnetic device according to claim 1, wherein the first air gap and the second air gap are oppositely disposed.
A wiring method, applied to the planar magnetic device described in any one of claims 1 to 4, said method comprising:

obtaining the current flowing through the coil winding, and the loss of the planar magnetic device;

determining line widths of the coil windings at different locations on the center post based on the current and the loss;

The coil windings are wound on the central column according to the wire widths at the different positions.
The method of claim 5 wherein, based on the current and the losses, determining the line width of the coil winding at different locations on the center post comprises:

determining a plurality of locations where the coil windings are wound on the center post;

determining a first distance of each location from the first air gap, and a second distance of each location from the second air gap;

Solving an objective function based on the first distance or the second distance, the current and the loss, to obtain the line widths at different positions.
The method according to claim 6, wherein solving an objective function based on the first distance or the second distance, the current and the loss to obtain the line width at different positions includes:

In response to the first distance being smaller than the second distance, solving the objective function based on the first distance, the current and the loss, to obtain the line width at different positions.
The method according to claim 6, wherein solving an objective function based on the first distance or the second distance, the current and the loss to obtain the line width at different positions includes:

In response to the first distance being greater than the second distance, solving the objective function based on the first distance, the current, and the loss, to obtain the line widths at different positions.
The method according to claim 6, wherein the method further comprises:

Obtain the resistivity of the coil winding, the product of the square of the current and the skin effect coefficient to obtain a first product, and obtain the ratio of the first product to the line width to obtain the skin effect loss function ;

Obtain the product of the line width, the resistivity, the number of turns of the coil winding, the square of the current and the proximity effect coefficient to obtain a second product, and obtain the second product and the first distance or the ratio of the square of the second distance to obtain the proximity effect loss function;

A weighted sum of the skin effect loss function and the proximity effect loss function is obtained to obtain the objective function.
A wiring device, applied to the planar magnetic device according to any one of claims 1 to 4, said device comprising:

an acquisition component configured to acquire the current flowing through the coil winding and the loss of the planar magnetic device;

a determining component configured to determine the line width of the coil winding at different positions on the center post based on the current and the loss;

The winding assembly is configured to wind the coil winding on the center column according to the wire width at the different positions.
A non-volatile storage medium, the non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the method steps according to any one of claims 5-9.
An electronic device, comprising: a processor and a memory; wherein the memory stores a computer program, the computer program is adapted to be loaded by the processor and execute the method steps according to any one of claims 5 to 9.