CN218384759U

CN218384759U - Magnetic combined inductor

Info

Publication number: CN218384759U
Application number: CN202222234670.2U
Authority: CN
Inventors: 阳满; 曾采虹; 沈孟武; 邹金英
Original assignee: Xiamen Hualian Electronics Co Ltd
Current assignee: Xiamen Hualian Electronics Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2023-01-24
Anticipated expiration: 2032-08-24

Abstract

The utility model relates to a magnetic combined inductor, which comprises a main magnetic core and a coil winding wound on the main magnetic core to form a main magnetic ring; the coil winding is provided with a section wound on the auxiliary magnetic core, so that an auxiliary magnetic ring is formed; the magnetic conductivity of the auxiliary magnetic ring is larger than that of the main magnetic ring. The number of turns of the original design is kept unchanged, and a plurality of partial turns are wound on the auxiliary magnetic ring with small magnetic conductivity, so that the whole inductance is improved: when the circuit is in light load, the integral PFC inductance is improved, so that ripple current of the circuit during working can be reduced, and the THD of the circuit is improved; when the load is heavy, the small magnetic ring is partially saturated, the inductance is close to 0uH, the power is received by the inductance of the main magnetic ring (PFC inductance), the normal work of the circuit is not influenced, and the function of the inductor is the same as that of the inductance of a single PFC magnetic ring. The problem that the existing active power factor and total harmonic distortion performance cannot be considered at the same time is solved.

Description

Magnetic combined inductor

Technical Field

The utility model belongs to the technical field of electronic components makes, specificly relate to a reduce PFC circuit THD's magnetism combination inductance.

Background

With the use of large quantities of high-power switching power supplies, variable-frequency speed regulators and electronic ballasts, power factor correction becomes a problem to be forcedly solved at home and abroad, for example, the european electrical commission stipulates that a circuit with the power of the switching power supply of more than 75W must be subjected to PFC correction.

Active power factor correction techniques have been widely used, in which an inductor is an indispensable element in a power correction circuit. The design of the inductor and the proper selection of the magnetic core/magnetic ring are crucial to the performance of the characteristics, efficiency and function of the circuit and obtaining satisfactory correction effect.

According to the electromagnetic theory basis, the larger the inductance L is, the lower the corresponding total harmonic distortion THD is, and the higher the power factor PF is. In order to reduce the THD of the circuit, the inductance is increased by the prior art means, and the inductance is improved by the past design experience through a plurality of winding turns, but the new problems of high inductance loss and easy saturation are caused, and the two problems are difficult to achieve.

Disclosure of Invention

The utility model aims at providing a magnetism combination inductance to solve the problem that current active power factor and total harmonic distortion performance can't be compromise.

The specific scheme is as follows:

a magnetic combined inductor comprises a main magnetic core and a coil winding wound on the main magnetic core to form a main magnetic ring; the coil winding is provided with a section wound on the auxiliary magnetic core, so that an auxiliary magnetic ring is formed; the magnetic conductivity of the auxiliary magnetic ring is larger than that of the main magnetic ring, so that the saturation flux of the auxiliary magnetic ring is smaller than that of the main magnetic ring.

The utility model discloses a further technical scheme does: the main magnetic core is a first annular magnetic core which is annular and provided with a first surrounding magnetic conduction part and a first cavity which is formed by the first magnetic conduction part in a surrounding way; the auxiliary magnetic core is arranged in the first cavity.

The utility model discloses a further technical scheme does: the auxiliary magnetic core is an annular second annular magnetic core and is provided with a second surrounding magnetic conduction part and a second cavity formed by the second magnetic conduction part in a surrounding mode; the outer side surface of the second annular magnetic core is butted against the inner side surface of the first annular magnetic core, and the coil winding is provided with a co-winding section which is wound around the first annular magnetic core and the second annular magnetic core simultaneously.

The utility model discloses a further technical scheme does: the coil winding also comprises a first section and a second section which are only wound on the main magnetic core, and the first section and the second section are electrically connected through the common winding section.

The utility model discloses a further technical scheme does: the sum of the winding turns of the first section and the second section is not less than three times of the winding turns of the co-wound section.

The utility model discloses a further technical scheme does: the winding turn ratio of the first section, the co-winding section and the second section is 1:1:4.

the utility model discloses a further technical scheme does: the main magnetic core and the auxiliary magnetic core have the same axial thickness.

The utility model discloses a further technical scheme does: the auxiliary magnetic core is made of one of power manganese zinc or magnetic powder core or alloy powder core or nanocrystalline.

Has the beneficial effects that:

the magnetic combined inductor of the utility model comprises a main magnetic core and a coil winding wound on the main magnetic core, thereby forming a main magnetic ring; the coil winding is provided with a section wound on the auxiliary magnetic core, so that an auxiliary magnetic ring is formed; the magnetic conductivity of the auxiliary magnetic ring is larger than that of the main magnetic ring. The purpose that the number of turns of the original design is kept unchanged is achieved, a plurality of partial turns of the magnetic ring are wound on the auxiliary magnetic ring with small magnetic conductivity, and the whole inductance is improved: when the circuit is in light load, the integral PFC inductance is improved, so that ripple current of the circuit during working can be reduced, and the THD of the circuit is improved; when the load is heavy, the small magnetic ring is partially saturated, the inductance is close to 0uH, the power is supported by the inductance of the main magnetic ring (PFC inductance), the normal work of the circuit is not influenced, and the function of the inductor is the same as that of the inductance of the single PFC magnetic ring. The problem that the existing active power factor and total harmonic distortion performance cannot be considered at the same time is solved.

Drawings

Fig. 1 shows the structure diagram of the magnetic combined inductor of the present invention.

Detailed Description

To further illustrate the various embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. The components in the drawings are not necessarily to scale, and similar reference numerals are generally used to identify similar components.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1, the embodiment provides a magnetic combined inductor, which includes a main magnetic core 2 and a coil winding 1 wound on the main magnetic core 2, thereby forming a main magnetic ring; in this embodiment, the main magnetic core 2 is a ring-shaped first ring-shaped magnetic core, which has a circumferentially surrounding first magnetic conductive portion and a first cavity 20 surrounded by the first magnetic conductive portion.

In the first cavity 20, an auxiliary magnetic core 3 is further disposed, and the coil winding 1 has a section wound on the auxiliary magnetic core 3, so that the auxiliary magnetic core 3 forms an auxiliary magnetic ring embedded in the main magnetic ring. In order to realize that the auxiliary magnetic ring reaches magnetic saturation first, the magnetic conductivity of the auxiliary magnetic ring is larger than that of the main magnetic ring; and the saturation flux of the auxiliary magnetic ring is smaller than that of the main magnetic ring, namely, the auxiliary magnetic ring reaches magnetic saturation firstly when the current is increased.

In this embodiment, the auxiliary core 3 is a second toroidal core having a circumferentially surrounding second magnetically permeable portion and a second cavity surrounded by the second magnetically permeable portion. The outer side surface of the second annular magnetic core of the auxiliary magnetic core 3 is abutted against the inner side surface of the first annular magnetic core of the main magnetic core 2, then the coil winding 1 is wound on the main magnetic core 2 firstly and then wound to the position of the auxiliary magnetic core 3, and the coil winding 1 adopts a mode of simultaneously winding the first magnetic conduction part and the second magnetic conduction part to form a co-winding section 10 for simultaneously winding the first annular magnetic core and the second annular magnetic core.

In this embodiment, it is defined that the first segment 11 wound on the main core 2 is wound between the initial end 13 and the co-wound segment 10, and the second segment 12 is wound after the co-wound segment 10, i.e. the first segment 11 and the second segment 12 are electrically connected through the co-wound segment 10.

In order to ensure the working performance of the main magnetic ring, the sum of the winding turns of the first section 11 and the second section 12 is not less than three times of the winding turns of the co-wound section 10, wherein, preferably, the winding turn ratio of the first section 11, the co-wound section 10 and the second section 12 is 1:1: and 4, the optimal proportion of the main magnetic ring and the auxiliary magnetic ring is realized.

Because the auxiliary magnetic core 3 is arranged in the first cavity 20, the structure is limited, the winding turns of the coil are also limited, and a material with higher magnetic permeability than the main magnetic core 2 is required to be used to ensure the working performance of the auxiliary magnetic core; the material of the auxiliary magnetic core 3 is preferably one of power manganese zinc or magnetic powder core or alloy powder core or nanocrystalline. In order to facilitate winding and fixing and ensure electrical performance, the main magnetic core and the auxiliary magnetic core have the same axial thickness.

The working principle of the embodiment is as follows:

the inventors have found that THD decreases as the load on the circuit increases. In the embodiment, the high-conductivity small magnetic ring, namely the auxiliary magnetic ring formed by the auxiliary magnetic core 3 is arranged in the inner ring of the main magnetic ring, the high-conductivity small magnetic ring and the auxiliary magnetic ring are combined to be wound, the auxiliary magnetic ring is wound for a plurality of turns according to the design requirement, the auxiliary magnetic ring is used for improving the inductance, the main magnetic ring is used for meeting the power requirement, and the high-conductivity small magnetic ring and the auxiliary magnetic ring are combined to be larger than the original single main magnetic ring in the inductance.

When the load is light, the current flowing through the PFC inductor is small, the auxiliary magnetic ring is not saturated, and the inductance is not 0uH, so that the problem that the THD of the PFC circuit is too high when the load is light can be solved; when the magnetic circuit is fully loaded, the current flowing through the PFC inductor becomes large, the small magnetic ring is saturated due to the material, the inductance is reduced to be close to 0uH, and the magnetic circuit cannot play a role, and the main magnetic ring inductor plays a role in the circuit.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A magnetic combined inductor comprises a main magnetic core and a coil winding wound on the main magnetic core to form a main magnetic ring; the method is characterized in that:

the coil winding is provided with sections wound on the auxiliary magnetic core so as to form an auxiliary magnetic ring;

the magnetic conductivity of the auxiliary magnetic ring is larger than that of the main magnetic ring.

2. The magnetic combined inductor of claim 1, wherein: the main magnetic core is a first annular magnetic core which is annular and provided with a first surrounding magnetic conduction part and a first cavity which is formed by the first magnetic conduction part in a surrounding way; the auxiliary magnetic core is arranged in the first cavity.

3. The magnetic composite inductor of claim 2, wherein: the auxiliary magnetic core is an annular second annular magnetic core and is provided with a second surrounding magnetic conduction part and a second cavity formed by the second magnetic conduction part in a surrounding mode; the outer side surface of the second annular magnetic core is abutted against the inner side surface of the first annular magnetic core, and the coil winding is provided with a co-winding section which is wound around the first annular magnetic core and the second annular magnetic core simultaneously.

4. The magnetic combined inductor of claim 3, wherein: the coil winding also comprises a first section and a second section which are only wound on the main magnetic core, and the first section and the second section are electrically connected through the common winding section.

5. The magnetic combined inductor of claim 4, wherein: the sum of the winding turns of the first section and the second section is not less than three times of the winding turns of the co-wound section.

6. The magnetic combined inductor of claim 5, wherein: the winding turn ratio of the first section, the co-winding section and the second section is 1:1:4.

7. the magnetic combined inductor of claim 2, wherein: the main magnetic core and the auxiliary magnetic core have the same axial thickness.

8. The magnetic combined inductor of claim 2, wherein: the auxiliary magnetic core is made of one of power manganese zinc or magnetic powder core or alloy powder core or nanocrystalline.