Controllable coupling inductance

Abstract

The utility model discloses a controllable coupling inductance, including magnetic core frame, primary winding, secondary winding, magnetic shielding layer, this magnetic core frame is as the whole shell of coupling inductance, is provided with the accommodation groove in this magnetic core frame, is provided with the middle column in this accommodation groove, this primary winding sets up in this accommodation groove, makes this primary winding position around on this middle column, this secondary winding sets up in this accommodation groove, makes this secondary winding around on the outside of this primary winding, and makes this secondary winding abut at the edge of this accommodation groove outside and obtain the support, the magnetic shielding layer is attached to the surface of this primary winding, makes this primary winding produce magnetic screen and change inductance value, and then modify the coupling rate of this coupling inductance.

Description

Technical Field

[0001] This invention belongs to the field of inductor technology, and in particular relates to a controllable coupled inductor. Background Technology

[0002] An inductor is a passive electronic component consisting of a coil wound around a magnetic core. Its main purpose is to store and control electrical energy in the form of magnetic energy by generating a magnetic field around the coil to resist changes in the current flowing through it. This characteristic makes inductors play an important role in various electrical and electronic applications.

[0003] Coupled inductors are passive electronic components that have two coils wound on the same magnetic core. When a current flows through the first coil and a magnetic field is generated, the magnetic field is coupled to the second coil and generates an induced voltage. Based on this principle, voltage conversion, energy transfer, impedance matching and signal isolation can be performed, so they are widely used in various electronic circuits.

[0004] One existing coupled inductor structure is commonly known as TLVR (Trans-Inductor Voltage Regulator). Its structure includes a primary winding and a secondary winding, which are wound together on the central column of the same magnetic core frame. Because the central column has the same volume, the inductance of the primary winding and the secondary winding are very similar, so the average coupling rate is above 0.95.

[0005] However, existing coupled inductors operate using induced voltage. If the load changes, the output voltage will rise or fall and then return to the set value, resulting in transient response. In addition, during voltage conversion, unfiltered noise will produce unwanted ripple components in the output voltage. All of these problems will affect the stability of the circuit and must be solved.

[0006] A known method to solve the aforementioned problem is to add a compensating inductor to the existing coupled inductor circuit. When the inductance value of the compensating inductor is small, the voltage ripple rate deteriorates, but the voltage transient response and magnetic energy conversion efficiency improve. Conversely, when the inductance value of the compensating inductor is large, the voltage transient response and magnetic energy conversion efficiency deteriorate, but the voltage ripple rate improves. Therefore, the inductance value of the compensating inductor must be adjusted to achieve a balance between voltage transient response, magnetic energy conversion efficiency, and ripple rate.

[0007] Therefore, existing coupled inductors, due to the limitations of their inherent structure, require complex and precise fine-tuning in the circuit, which affects operating efficiency and circuit stability. They still have shortcomings and urgently need to be improved.

[0008] In view of the aforementioned problems, the creator of this invention, based on the shortcomings of existing coupled inductors, began research and development and improvement. Through repeated experiments and modifications, the controllable coupled inductor of this invention was finally completed. Utility Model Content

[0009] The main purpose of this invention is to provide a controllable coupled inductor, wherein a control patch is set on the outside of the primary winding to modify the control parameters of the coupled inductor, reduce the voltage ripple rate, and obtain better voltage transient and magnetic energy conversion efficiency.

[0010] Another objective of this invention is to provide a controllable coupled inductor in which the configuration of a compensation inductor can be eliminated, thereby simplifying the design of electronic circuits, reducing adjustment time, and achieving better work quality and efficiency.

[0011] Another objective of this invention is to provide a controllable coupled inductor that further increases the stability of the circuit during operation, reduces the occurrence of errors, and thus lowers the setup cost.

[0012] To achieve the above objectives, this utility model provides a controllable coupled inductor, comprising: a magnetic core frame, a primary winding, a secondary winding, and a magnetic shielding layer.

[0013] The magnetic core frame serves as the overall outer shell of the coupled inductor. An internal receiving slot is provided within the magnetic core frame, and a central post is located within the receiving slot. The primary winding is positioned within the receiving slot, surrounding the central post. The secondary winding is also positioned within the receiving slot, surrounding the outside of the primary winding and supported by its abutment against the outer edge of the receiving slot. A magnetic shielding layer is attached to the surface of the primary winding, causing magnetic shielding and altering the inductance value, thereby modifying the coupling rate of the coupled inductor.

[0014] Preferably, the magnetic core frame is formed by high pressure molding of ferrite, and its magnetic permeability is between 1600 and 2000.

[0015] Preferably, the magnetic shielding layer is a soft ferrite patch that can be easily attached to the surface of the primary winding, and its magnetic permeability is between 100 and 500.

[0016] Preferably, the thickness of the magnetic shielding layer is between 0.2 and 0.4 mm.

[0017] Preferably, the magnetic shielding layer modifies the coupling rate of the coupled inductor by adjusting the area coverage of the primary winding surface.

[0018] In summary, this invention utilizes a flexible ferrite patch, eliminating the need for a compensation inductor, and provides a simple and effective way to modify the control parameters of the coupled inductor, reducing voltage ripple rate and achieving better voltage transient and magnetic energy conversion efficiency. This optimizes circuit configuration efficiency and improves operational efficiency. Attached Figure Description

[0019] Figure 1 This is an exploded perspective view of the controllable coupled inductor of this utility model.

[0020] Figure 2 A three-dimensional view of the controllable coupled inductor with the front end removed;

[0021] Figure 3 This is a planar combination diagram of the controllable coupled inductor with the front end removed;

[0022] Figure 4 This is a complete three-dimensional diagram of the controllable coupled inductor;

[0023] Figure 5 This is an example diagram showing the variation in the magnetic shielding coverage of the controllable coupled inductor; and

[0024] Figure 6 This is an example of the change in the magnetic shielding coverage relative to the inductance coupling rate of this controllable coupled inductor.

[0025] Explanation of reference numerals in the attached diagram: 100-Magnetic core frame; 101-Front cover; 102-Rear cover; 110-Accommodation slot; 120-Center column; 200-Primary winding; 300-Secondary winding; 400-Magnetic shielding layer. Detailed Implementation

[0026] The following description, in conjunction with the accompanying drawings, illustrates specific embodiments of the present invention so that the advantages and features of the present invention can be more readily understood by those skilled in the art, and so that they can implement the technical content of the present invention accordingly.

[0027] Please see Figures 1 to 4 The present invention provides a controllable coupled inductor, which mainly includes: a magnetic core frame 100, a primary winding 200, a secondary winding 300, and a magnetic shielding layer 400.

[0028] The magnetic core frame 100 is formed by high pressure of ferrite and is used as the overall shell of the coupled inductor. In practice, it can be disassembled into a front cover 101 and a rear cover 102 and then merged into one. A receiving groove 110 is provided inside the magnetic core frame 100 to accommodate other components. A central column 120 is provided in the receiving groove 110 to provide positioning for the components.

[0029] The primary winding 200 is disposed within the receiving slot 110, positioned around the central post 120. The secondary winding 300 is disposed within the receiving slot 110, surrounding the primary winding 200 and supported by abutting against the outer edge of the receiving slot 110. Thus, the primary winding 200 and the secondary winding 300 are wound together on the same central post 120, achieving magnetic coupling induction.

[0030] The magnetic shielding layer 400 is attached to the surface of the primary winding 200, causing the primary winding 200 to be magnetically shielded and changing the inductance value, thereby modifying the coupling rate of the coupled inductor.

[0031] The main function of this utility model is to add a magnetic shielding layer 400. The magnetic shielding layer 400 is a soft ferrite patch that can be easily and finely adjusted to be completely attached to the surface of the primary winding 200, so as to form the required magnetic shielding effect between the primary winding 200 and the secondary winding 300.

[0032] In addition, the ferrite structure of the magnetic core frame 100 has a permeability between 1600 and 2000.

[0033] The soft ferrite patch structure of the magnetic shielding layer 400 has a magnetic permeability between 100 and 500 and a thickness between 0.2 and 0.4 mm to achieve its best effect.

[0034] Furthermore, the magnetic shielding layer 400 modifies the coupling rate of the coupled inductor by adjusting the area coverage of the primary winding 200 surface. For example... Figure 5 The arrows indicate the gradual increase in the coverage of the magnetic shielding layer 400, up to a maximum of 100% full coverage. The change in the coverage of the magnetic shielding layer 400 corresponds to the change in the inductive coupling rate of this invention as follows: Figure 6 As shown.

[0035] The above-described embodiments are only some of the embodiments of this utility model, but are not intended to limit the scope of this utility model. For those skilled in the art, any modifications and improvements derived therefrom without departing from the technical features outlined in the claims of this utility model are all within the protection scope of this utility model.

Claims

1. A controllable coupled inductor, characterized in that, include: The magnetic core frame serves as the overall outer shell of the coupled inductor. The magnetic core frame has an internal receiving groove, and a central column is disposed within the receiving groove. The primary winding is disposed in the receiving slot, and the primary winding is positioned around the central column; A secondary winding is disposed within the receiving slot, such that the secondary winding surrounds the outside of the primary winding, and the secondary winding abuts against the edge of the outer side of the receiving slot for support. as well as A magnetic shielding layer is attached to the surface of the primary winding to create magnetic shielding and change the inductance value of the primary winding, thereby modifying the coupling rate of the coupled inductor.

2. The controllable coupled inductor as described in claim 1, characterized in that, The magnetic core frame is formed by high pressure of ferrite, and its magnetic permeability is between 1600 and 2000.

3. The controllable coupled inductor as described in claim 1, characterized in that, The magnetic shielding layer is a soft ferrite patch, which can be easily attached to the surface of the primary winding, and its magnetic permeability is between 100 and 500.

4. The controllable coupled inductor as described in claim 3, characterized in that, The thickness of the magnetic shielding layer is between 0.2 and 0.4 mm.

5. The controllable coupled inductor as described in claim 3, characterized in that, The magnetic shielding layer modifies the coupling rate of the coupled inductor by adjusting the area coverage of the primary winding surface.

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