Insulated flat cable

Abstract

An insulating flat cable comprises a plurality of conductive units, each conductive unit is an insulating wire composed of a conductor and an insulating part, and the plurality of conductive units are bonded through a viscous material to form the flat cable. The width of the conductor of the conductive unit is greater than the thickness of the conductor; the thickness of the conductor of the conductive unit is one time of the skin depth; the insulated wire is a three-layer insulated wire.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology and relates to an insulated flat cable. Background Art

[0002] High-end power supply products are developing towards high efficiency and high power density; with the pursuit of power density by switching power supplies, the application of high-frequency operating frequency is becoming more and more widespread.

[0003] Generally, traditional transformers and traditional inductors are of the winding type, which are made by winding the coil on a frame and assembling it with a magnetic core or directly winding it on a magnetic ring.

[0004] The Chinese patent application number CN202222327825.7, based on a high-frequency inductor with a flexible PCB winding, points out that: for high-frequency inductors, the winding uses copper foil, and the winding is wound parallel to the center column of the magnetic core. Under the premise of a certain copper foil width, the preferred value of the copper foil thickness is 0.7 times the skin depth, and the loss is close to the minimum value at this time; the copper foil thickness is greater or less than this preferred value, and the loss will increase; for copper foil, the frequency of 100KHz, the skin depth is about 0.21mm, and the copper foil thickness is about 0.15mm. When the loss is the smallest; for copper foil, the frequency of 25KHz, the skin depth is about 0.42mm, and the copper foil thickness is about 0.30mm. The Chinese patent application number CN202222327825.7 provides a high-frequency inductor based on a flexible PCB winding, which can reduce the copper loss of the inductor; because a flexible PCB is used as a winding, the flexible PCB needs to be customized for different switching frequencies and different core sizes, and it is impossible to form a unified specification.

[0005] If copper foil is used directly for winding, the leads at the end points of the copper foil need to be welded, and interlayer insulation is required during the copper foil winding process, which makes the manufacturing process more complicated. Summary of the invention

[0006] This application is made in consideration of the above problems.

[0007] The purpose of the present application is to provide an insulated flat cable, characterized in that it comprises: a plurality of conductive units, wherein the conductive units are insulated wires composed of conductors and insulating parts, and the plurality of conductive units are bonded together into a flat cable by an adhesive material.

[0008] The width of the conductor of the conductive unit is greater than the thickness of the conductor.

[0009] Optionally, the thickness of the conductor of the conductive unit is 1 times the skin depth.

[0010] Optionally, the insulated wire is a three-layer insulated wire.

[0011] According to the technical solution of using the insulated flat wire as the winding of the high-frequency inductor of the present application, low energy loss can be maintained even in the application of high-power resonant inductors. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The advantages of the present application will become more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of an insulated flat cable according to an embodiment of the present application. Implementation

[0013] The present application will be described in detail below with reference to the accompanying drawings.

[0014] The present application provides an insulated flat cable. Figure 1 It is a structural schematic diagram of an insulated flat cable according to an embodiment of the present application.

[0015] like Figure 1 As shown in , the insulated cable includes a plurality of conductive units, wherein the conductive units are insulated wires composed of conductors and insulating parts, and the plurality of conductive units are bonded together into a cable by an adhesive material; Figure 1 The insulated cable includes three conductive units, the conductor 01 and the insulating portion 02 constitute an insulated wire, and the three conductive units are bonded together by an adhesive material 03 to form a cable.

[0016] The width of the conductor of the conductive unit is greater than the thickness of the conductor; the reason why high-frequency inductors use copper foil is that the higher the switching frequency, the thinner the copper foil needs to be to reduce losses; replacing copper foil with an insulated cable also requires reducing the thickness of the conductor. At the same time, the width of the conductor needs to be greater than the thickness of the conductor, thereby increasing the proportion of the conductor in the insulated cable and reducing the on-resistance.

[0017] Optionally, the thickness of the conductor of the conductive unit is 1 times the skin depth; the thickness of the conductor can have multiple specifications corresponding to the switching frequency, and the higher the switching frequency, the smaller the thickness of the conductor of the selected insulated cable.

[0018] Optionally, the insulated wire is a three-layer insulated wire, wherein the material of the conductor is copper.

[0019] Triple Insulated wire is also called triple insulated wire. It is a high-performance insulated wire newly developed in the world in recent years. This wire has three insulation layers, with the core wire in the middle. The first layer is a golden polyamide film with a thickness of several microns, but it can withstand a pulse high voltage of 1kV; the second layer is a high-insulation spray paint coating; the third layer (outermost layer) is a transparent glass fiber layer. The total thickness of the insulation layer is only 20 microns to 100 microns. Triple insulated wire is suitable for cutting-edge technology, defense fields, and the production of micro motor windings and high-frequency transformer windings for miniaturized switching power supplies.

[0020] The three-layer insulated wire technology is mature and easy to produce in large quantities.

[0021] The number of conductive units of the insulated cable can have multiple specifications, and the width of the conductor of the conductive unit of the insulated cable can have multiple specifications; optionally, the number of conductive units of the insulated cable is 50, the width of the conductor of the conductive unit of the insulated cable is 1 mm, and the total width of the insulated cable is 60 mm. If the winding width of the high-frequency inductor skeleton is 8 mm, the number of conductive units of the insulated cable can be selected to be 6 and the width is about 7.2 mm; the insulated cable with 6 conductive units can be obtained by splitting from the insulated cable with 50 conductive units, which is very convenient. Before the insulated cable with 6 conductive units is wound onto the skeleton of the high-frequency inductor, it is first split into a single insulated wire at the beginning and the end to facilitate bending, so that the beginning and the end can be easily led to the pins of the skeleton.

[0022] Since the present application can be implemented in a variety of forms, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly interpreted within the scope defined by the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An insulated flat cable, characterized in that: include: A plurality of conductive units are insulating wires composed of conductors and insulating parts, and the plurality of conductive units are bonded together into a wiring arrangement by an adhesive material.

2. The insulated flat cable according to claim 1, characterized in that: The width of the conductor of the conductive unit is greater than the thickness of the conductor.

3. The insulated flat cable according to claim 1, characterized in that: The thickness of the conductor of the conductive unit is 1 times the skin depth.

4. The insulated flat cable according to claim 1, characterized in that: The insulated wire is a three-layer insulated wire.

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