CN202275687U - Difference and common module integrated inductor and electromagnetic interference (EMI) filter - Google Patents

Abstract

The utility model discloses a differential common mode integrated inductor and an electromagnetic interference filter, wherein the differential common mode integrated inductor includes a differential mode magnetic ring, a common mode magnetic ring and two wire harnesses; an end face of the differential mode magnetic ring is connected to the One end face of the common mode magnetic ring is opposite; one bundle is wound in a single turn in the shape of a "0", and the other wire harness is wound in a single turn in a shape of "8" and is respectively symmetrically wound on the differential mode magnetic ring and the common mode magnetic ring. On the mold magnetic ring. The differential common-mode integrated inductor of the utility model improves the noise suppression ability of the EMI filter while reducing the volume of the EMI filter.

Description

Differential Common Mode Integrated Inductor and EMI Filter

technical field

The utility model relates to the field of electronic components, in particular to a differential common-mode integrated inductor in an electromagnetic interference filter.

Background technique

At present, any electronic or electrical product must be equipped with an EMI (Electro Magnetic Interference, electromagnetic interference) filter at its power input and output terminals or signal ports to suppress conducted electromagnetic interference so that the electromagnetic interference generated by itself will not cause harm to the environment. Pollution also prevents electromagnetic interference from the electromagnetic environment from affecting its normal work.

In the existing EMI filter structure, one case is that the differential mode inductor and the common mode inductor are independent, and are made of different magnetic surrounds respectively. The EMI filter with this structure has a larger volume and takes up more space; Another situation is that the differential mode inductor is not used in the EMI filter, but only the differential mode leakage inductance of the common mode inductor is used to realize the differential mode filtering. Although it is relatively small in size, its ability to suppress differential mode noise is poor.

Utility model content

The main purpose of the utility model is to provide a differential common-mode integrated inductor and EMI filter, aiming at reducing the volume of the EMI filter and improving the noise suppression ability of the EMI filter.

The utility model provides a differential common-mode integrated inductor, which comprises a differential-mode magnetic ring, a common-mode magnetic ring and two wire harnesses; an end face of the differential-mode magnetic ring is opposite to an end face of the common-mode magnetic ring; a wire harness The single-turn winding mode is "0" shape, and the other wire bundle is wound symmetrically on the differential mode magnetic ring and the common mode magnetic ring respectively in a single-turn winding mode "8" shape.

Preferably, the two wire bundles start from the same magnetic ring, and are symmetrically and uniformly wound on the differential mode magnetic ring and the common mode magnetic ring respectively.

Preferably, the material of the differential mode magnetic ring is iron powder core or sendust.

Preferably, the differential-mode magnetic ring is located below the common-mode magnetic ring, and the two sections of wire harnesses use the differential-mode magnetic ring as the starting end of the winding, and the starting ends of the two-section wire harnesses are respectively located at different ends of the differential-mode magnetic ring. side.

Preferably, the single turn is a "0"-shaped wire harness, which is wound on the left half of the differential mode magnetic ring and the common mode magnetic ring in a counterclockwise or clockwise direction; the single turn is an "8" shaped wire harness , wound on the right half circle of the differential mode magnetic ring and the common mode magnetic ring.

Preferably, the single-turn wire harness in the shape of "0" is wound around the right half circle of the differential-mode magnetic ring and the common-mode magnetic ring in the counterclockwise or clockwise direction; the single-turn wire harness in the shape of "8", It is wound on the left half circle of the differential mode magnetic ring and the common mode magnetic ring.

Preferably, the differential mode magnetic ring is located above the common mode magnetic ring, and the two sections of wire harnesses use the common mode magnetic ring as the starting end of the winding, and the starting ends of the two sections of wire harness are located on the same side of the common mode magnetic ring .

Preferably, the single turn is a "0"-shaped wire harness, which is wound on the left half of the differential mode magnetic ring and the common mode magnetic ring in a counterclockwise or clockwise direction; the single turn is an "8" shaped wire harness , wound on the right half circle of the differential mode magnetic ring and the common mode magnetic ring.

Preferably, the single turn is a "0"-shaped wire harness, which is wound on the right half of the differential mode magnetic ring and the common mode magnetic ring in a counterclockwise or clockwise direction; the single turn is an "8" shaped wire harness , wound on the left half circle of the differential mode magnetic ring and the common mode magnetic ring.

The utility model also provides an EMI filter, which is provided with a differential common-mode integrated inductor. The differential-common-mode integrated inductor includes a differential-mode magnetic ring, a common-mode magnetic ring, and two wire harnesses; one end face of the differential-mode magnetic ring is opposite to an end face of the common-mode magnetic ring; one wire is wound in a single-turn manner In the shape of "0", the other wire bundle is wound symmetrically on the differential mode magnetic ring and the common mode magnetic ring respectively in a single-turn winding manner in the shape of "8".

The utility model combines the differential mode magnetic ring and the common mode magnetic ring together through a specific winding method to realize the integration of the differential common mode inductance, which can not only reduce the volume of the existing EMI filter, but also improve the performance of the EMI filter. Noise suppression capability, taking into account the suppression of differential common mode noise.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the utility model differential common mode integrated inductor;

2 is a schematic diagram of a vertical cross-sectional structure in the first embodiment of the differential common-mode integrated inductor of the present invention;

3 is a schematic diagram of a vertical cross-sectional structure in the second embodiment of the differential common-mode integrated inductor of the present invention;

4 is a schematic diagram of a vertical cross-sectional structure in the third embodiment of the differential common-mode integrated inductor of the present invention;

5 is a schematic diagram of a vertical cross-sectional structure in a fourth embodiment of a differential common-mode integrated inductor of the present invention;

6 is a schematic diagram of a vertical cross-sectional structure in a fifth embodiment of the differential common-mode integrated inductor of the present invention;

7 is a schematic diagram of a vertical cross-sectional structure in the sixth embodiment of the differential common-mode integrated inductor of the present invention;

FIG. 8 is a schematic diagram of a vertical cross-sectional structure in the seventh embodiment of the differential common-mode integrated inductor of the present invention;

FIG. 9 is a schematic diagram of a vertical cross-sectional structure of the eighth embodiment of the differential common-mode integrated inductor of the present invention.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Referring to FIG. 1 , a structural schematic diagram of an embodiment of the differential common mode integrated inductor of the present invention is proposed. The differential common mode integrated inductor of the utility model includes a differential mode magnetic ring 11 , a common mode magnetic ring 12 , a first wiring harness 21 and a second wiring harness 22 . Wherein, one end surface of the differential mode magnetic ring 11 is opposite to one end surface of the common mode magnetic ring 12 . The first wire harness 21 is wound in the shape of a "0" in a single turn, and the second wire harness 22 is wound in a shape of an "8" in a single turn and is respectively symmetrically wound on the differential mode magnetic ring 11 and the common mode magnetic ring 12 . Of course, it is also possible that the first wire harness 21 is wound in a single-turn shape in the shape of an "8", and the second wire harness 22 is wound in a single-turn shape in a shape of a "0" and is symmetrically wound on the differential-mode magnetic ring 11 and the common-mode magnetic ring respectively. 12 on. After the winding is completed, the second wire bundle 22 is spaced between the ends of the differential mode magnetic ring 11 and the common mode magnetic ring 12 . In the embodiment of the utility model, in order to prevent the differential mode inductance from being saturated due to excessive current in the first wire harness 21 and the second wire harness 22, the differential mode magnetic ring 11 is made of iron powder core, sendust and other materials with low magnetic permeability.

It should be noted that in the embodiment of the present utility model, only a kind of winding method of the first wire harness 21 and the second wire harness 22 is listed. The wire harness 22 adopts a continuous winding form, and is evenly and symmetrically wound on the two half cycles of the differential mode magnetic ring 11 and the common mode magnetic ring 12 respectively. In the embodiment of the present utility model, the number of turns n of the first wire harness 21 and the second wire harness 22 may be different depending on the application environment of the product (for example, 1-100 or more), which is not limited here.

The differential-common-mode integrated inductor of the utility model is formed by stacking two magnetic rings together. Compared with the prior art, the common-mode magnetically surrounds the common-mode inductor and the differential-mode magnetically surrounds the differential-mode inductor to form two inductors. The differential common-mode integrated inductor of the utility model has a smaller volume; and because the differential common-mode integrated inductor of the utility model includes the differential-mode inductor without reducing the inductance of the common-mode inductor, instead of only relying on the difference of the common-mode inductor The differential mode filter is completed by using the mode leakage inductance, which greatly improves the differential mode filter effect.

In the embodiment of the present utility model, there are various winding forms of the first wire harness 21 and the second wire harness 22, which can be flexibly selected. The starting end is symmetrically and evenly wound on the two half cycles of the differential mode magnetic ring 11 and the common mode magnetic ring 12 . The single turn of the first wire harness 21 can be in the shape of "8", and the single turn of the second wire harness 22 can be in the shape of "0"; The single turn is "8" shape.

In the embodiment of the present utility model, the differential mode magnetic ring 11 can be located under the common mode magnetic ring 12, and the two sections of wire harnesses all use the differential mode magnetic ring 11 as the winding starting end; or, the differential mode magnetic ring 11 is located at the common mode magnetic ring Above 12, the two sections of wire harnesses both use the common mode magnetic ring 12 as the starting end of the winding. The structure of the differential-common-mode integrated inductor of the present invention will be described in detail below in terms of different positions of the differential-mode magnetic ring 11 relative to the common-mode magnetic ring 12 in multiple embodiments.

Referring to Fig. 2 to Fig. 5, it is a schematic diagram of the vertical cross-sectional structure of the differential common mode integrated inductor of the present invention after winding, showing several winding forms when the differential mode magnetic ring 11 is located above the common mode magnetic ring 12, In the embodiments shown in FIGS. 2 to 5 , both the first wire harness 21 and the second wire harness 22 use the common-mode magnetic ring 12 as the winding starting end, and the starting ends of the two wire harnesses are located on the same side of the common-mode magnetic ring 12 .

As shown in FIG. 2 , it is a schematic diagram of a vertical cross-sectional structure in the first embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire bundle 21 is located on the inner side of the left half of the common mode magnetic ring 12, and is evenly wound on the left half of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in a clockwise continuous winding form. The turns form a "0" shape. The second wire bundle 22 starts from the inner side of the right half of the common mode magnetic ring 12 to the outer side of the common mode magnetic ring 12, and is evenly wound on the right half of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of cross winding, forming a single turn "8" shape.

As shown in FIG. 3 , it is a schematic diagram of the vertical cross-sectional structure in the second embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire harness 21 is located inside the common-mode magnetic ring 12 , and is evenly wound on the left half of the differential-mode magnetic ring 11 and the common-mode magnetic ring 12 in the form of cross winding. Specifically, the first wire harness 21 starts from the inner side of the left half of the common-mode magnetic ring 12, winds to the outside of the common-mode magnetic ring 12, passes through the contact surface of the common-mode magnetic ring 12 and the differential-mode magnetic ring 11, and the differential-mode magnetic ring 11 The inner side of the left half circle, the top surface of the left half circle of the differential mode magnetic ring 11, the outer side of the left half circle of the differential mode magnetic ring 11, the contact surface between the differential mode magnetic ring 11 and the common mode magnetic ring 12, the inner side of the left half circle of the common mode magnetic ring 12 , until the outside of the common mode magnetic ring 12, a single turn forms an "8" shape. The starting end 221 of the second wire harness 22 is located at the inner side of the right half circle of the common mode magnetic ring 12, starting from the inner side of the right half circle of the common mode magnetic ring 12, and is evenly wound around the differential mode magnetic ring 11 and the common mode magnetic ring 11 in the form of continuous winding in the counterclockwise direction. On the right half circle of the magnetic ring 12, a single turn forms a "0" shape.

As shown in FIG. 4 , it is a schematic diagram of the vertical cross-sectional structure in the third embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire harness 21 is located on the outside of the left half of the common mode magnetic ring 12, starting from the outside of the left half of the common mode magnetic ring 12, and evenly wound on the differential mode magnetic ring 11 and the common mode magnetic ring 11 in the form of cross winding. The left half circle of the mold magnetic ring 12 forms a "8" shape with a single turn. The starting end 221 of the second wire harness 22 is located at the outside of the right half circle of the common mode magnetic ring 12, and starts from the outside of the right half circle of the common mode magnetic ring 12, and is evenly wound around the differential mode magnetic ring 11 and the common mode magnetic ring 11 in a clockwise continuous winding form. On the right half of the ring 12, a single turn forms a "0" shape.

As shown in FIG. 5 , it is a structural schematic diagram of a vertical section in the fourth embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire harness 21 is located outside the left half circle of the common mode magnetic ring 12, and is evenly wound on the left half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of counterclockwise continuous winding. The turns form a "0" shape. The second wire bundle 22 starts from the outer side of the right half of the common mode magnetic ring 12 to the inner side of the common mode magnetic ring 12, and is evenly wound on the right half of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of cross winding, forming a single turn "8" shape.

Referring to FIG. 6 to FIG. 9 , it is a schematic diagram of the vertical cross-sectional structure of the differential-common mode integrated inductor of the utility model after winding, showing several winding forms when the differential-mode magnetic ring 11 is located below the common-mode magnetic ring 12 . In the embodiment shown in FIGS. 6 to 9 , both the first wire harness 21 and the second wire harness 22 use the differential mode magnetic ring 11 as the starting end of the winding, and the starting ends of the two wire harnesses are respectively located on different sides of the differential mode magnetic ring 11 . That is, the starting end of the first wire bundle 21 is positioned at the inside of the differential mode magnetic ring 11, and the starting end of the second wire bundle 22 is positioned at the outside of the differential mode magnetic ring 11; or the starting end of the first wire bundle 21 is positioned at the outside of the differential mode magnetic ring 11, and the second The starting end of the wire harness 22 is located inside the differential mode magnetic ring 11 .

As shown in FIG. 6 , it is a schematic view of the vertical cross-sectional structure of the fifth embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire harness 21 is located inside the left half circle of the differential mode magnetic ring 11, and is evenly wound on the left half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of cross winding, and its single turn is " 8" shape. Specifically, the first wire harness 21 starts from the inner side of the left half of the differential mode magnetic ring 11, winds to the outside of the differential mode magnetic ring 11, passes through the contact surface of the differential mode magnetic ring 11 and the common mode magnetic ring 12, and the left side of the common mode magnetic ring 12. The inside of the half circle, the top surface of the left half circle of the common mode magnetic ring 12, the outside of the left half circle of the common mode magnetic ring 12, the contact surface between the differential mode magnetic ring 11 and the common mode magnetic ring 12, the inner side of the left half circle of the differential mode magnetic ring 11, to The outer side of the differential mode magnetic ring 11 stops. The starting end 221 of the second wire bundle 22 is located outside the differential mode magnetic ring 11, and passes through the right half circle inside of the differential mode magnetic ring 11 and the common mode magnetic ring 12, and the right half circle of the common mode magnetic ring 12 in a clockwise direction in a continuous winding form. The top surface, the outer side of the right half circle of the common mode magnetic ring 12 and the differential mode magnetic ring 11, to the inner side of the right half circle of the differential mode magnetic ring 11, evenly wound on the right half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12, single turn It is in the shape of "0".

As shown in FIG. 7 , it is a schematic diagram of the vertical cross-sectional structure of the sixth embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire bundle 21 is located outside the left half circle of the differential mode magnetic ring 11, and is evenly wound on the left half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of cross winding, and its single turn is "8" shape. The starting end 221 of the second wire harness 22 is located inside the differential mode magnetic ring 11, and passes through the outside of the right half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12, and the right half circle of the common mode magnetic ring 12 in a counterclockwise direction in a continuous winding form. The top surface, the inside of the right half circle of the common mode magnetic ring 12 and the differential mode magnetic ring 11, to the outside of the right half circle of the differential mode magnetic ring 11, evenly wound on the right half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12, single turn It is in the shape of "0".

As shown in FIG. 8 , it is a schematic diagram of the vertical cross-sectional structure of the differential common-mode integrated inductor in the seventh embodiment of the differential common-mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire harness 21 is located inside the differential mode magnetic ring 11, and is evenly wound on the left half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in a clockwise continuous winding form, forming a single turn "0" shape. The starting end 221 of the second wire harness 22 is located outside the differential mode magnetic ring 11, and is evenly wound on the right half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of cross winding, and its single turn is in the shape of "8".

As shown in FIG. 9 , it is a schematic cross-sectional structure diagram of the eighth embodiment of the differential common mode integrated inductor of the present invention. In this embodiment, the starting end 211 of the first wire bundle 21 is located outside the differential mode magnetic ring 11, and is evenly wound on the left half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in a counterclockwise continuous winding form, forming a single turn "0" shape. The starting end 221 of the second wire harness 22 is located inside the differential mode magnetic ring 11, and is evenly wound on the right half circle of the differential mode magnetic ring 11 and the common mode magnetic ring 12 in the form of cross winding, with a single turn in the shape of "8".

The utility model also provides an EMI filter, which is provided with the above-mentioned differential common-mode integrated inductor. The differential-common-mode integrated inductor includes a differential-mode magnetic ring 11, a common-mode magnetic ring 12, and two wire harnesses, one of which is wound in a single-turn manner in the shape of a "0" and the other wire harness is wound in a single-turn manner in the shape of an "8" The shape is symmetrically wound on the differential mode magnetic ring 11 and the common mode magnetic ring 12 respectively, so as to realize the integration of differential common mode inductors. In the EMI filter of the present invention, the structure of the differential common-mode integrated inductor may refer to the embodiments shown in FIGS. 1 to 9 above. Due to the adoption of the structure of the differential common-mode integrated inductor in the foregoing embodiments, the EMI filter of the present invention is not only smaller in size than the EMI filter in the prior art, but also has the noise suppression capability of the differential-mode inductor.

The above descriptions are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the specification of the utility model and the contents of the accompanying drawings may be directly or indirectly used in Other relevant technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (10)

1. a poor common mode integrated inductor is characterized in that, comprises differential mode magnet ring, common mode magnet ring and two sections wire harness; An end face of said differential mode magnet ring is relative with an end face of said common mode magnet ring; One wire harness with the single turn canoe be " 0 " word shape, another wire harness with the single turn canoe for " 8 " word shape respectively symmetry be wrapped on said differential mode magnet ring and the common mode magnet ring.

2. poor common mode integrated inductor as claimed in claim 1 is characterized in that, said two sections wire harness are top with same magnet ring, are wrapped in symmetrically and evenly respectively on differential mode magnet ring and the common mode magnet ring.

3. poor common mode integrated inductor as claimed in claim 2 is characterized in that, the material of said differential mode magnet ring is ferrocart core or iron sial.

4. poor common mode integrated inductor as claimed in claim 3 is characterized in that said differential mode magnet ring is positioned at the below of said common mode magnet ring, and said two sections wire harness serve as the coiling initiating terminal with the differential mode magnet ring all, and the initiating terminal of two sections wire harness lays respectively at the heteropleural of differential mode magnet ring.

5. poor common mode integrated inductor as claimed in claim 4 is characterized in that said single turn is the wire harness of " 0 " word shape, is wrapped in the left half cycle of differential mode magnet ring and common mode magnet ring according to counterclockwise or clockwise direction; Said single turn is the wire harness of " 8 " word shape, is wrapped in the right half cycle of differential mode magnet ring and common mode magnet ring.

6. poor common mode integrated inductor as claimed in claim 4 is characterized in that said single turn is the wire harness of " 0 " word shape, is wrapped in differential mode magnet ring and the right half cycle of common mode magnet ring according to counterclockwise or clockwise direction; Said single turn is the wire harness of " 8 " word shape, is wrapped in the left half cycle of differential mode magnet ring and common mode magnet ring.

7. poor common mode integrated inductor as claimed in claim 3 is characterized in that said differential mode magnet ring is positioned at the top of said common mode magnet ring, and said two sections wire harness serve as the coiling initiating terminal with the common mode magnet ring all, and the initiating terminal of two sections wire harness is positioned at the homonymy of common mode magnet ring.

8. poor common mode integrated inductor as claimed in claim 7 is characterized in that said single turn is the wire harness of " 0 " word shape, is wrapped in the left half cycle of differential mode magnet ring and common mode magnet ring according to counterclockwise or clockwise direction; Said single turn is the wire harness of " 8 " word shape, is wrapped in the right half cycle of differential mode magnet ring and common mode magnet ring.

9. poor common mode integrated inductor as claimed in claim 7 is characterized in that said single turn is the wire harness of " 0 " word shape, is wrapped in the right half cycle of differential mode magnet ring and common mode magnet ring according to counterclockwise or clockwise direction; Said single turn is the wire harness of " 8 " word shape, is wrapped in the left half cycle of differential mode magnet ring and common mode magnet ring.

10. an EMI FILTER is characterized in that, comprises like each described poor common mode integrated inductor in the claim 1 to 9.

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