CN206893387U - A kind of inductance, wave filter and electronic product for collecting common mode differential mode filtering one - Google Patents

Abstract

The utility model discloses a kind of inductance for collecting common mode differential mode filtering one, including common mode inductance, the difference for being wound in the first coil of the magnetic core both sides of common mode inductance and the number of turn of the second coil is more than 0.Because first coil is different with the number of turn of the second coil, therefore, on same inductance, i.e., it can realize that common mode filtering can also realize that differential mode filters.This inductance need not increase the differential mode filter effect that extra differential mode inductance can but reach same, accomplish the integration of common mode differential mode inductance with this, and component number used is less, reduces cost and the space requirement of circuit board.In addition, a kind of wave filter and electronic product of the inductance comprising above-mentioned collection common mode differential mode filtering one is also disclosed in the utility model, therefore equally have above-mentioned effective.

Description

A kind of inductance, wave filter and electronic product for collecting common mode differential mode filtering one

Technical field

Electronic technology field is the utility model is related to, more particularly to a kind of inductance for collecting common mode differential mode filtering one, filter Ripple device and electronic product.

Background technology

Electronic circuit develops to high frequency, high power density, high reliability, high integration at present, consequently also brings wide General electromagnetic interference problem, therefore EMC wave filters are widely used in electronic circuit, as AC power enters line filter, opens Powered-down source output filter etc., in these electronic products, common-mode inductor and differential mode inductors are essential crucial devices Part.

The common mode inductance that the used EMC wave filters on power supply product use at present is around two groups on same magnetic core The coil of identical quantity, so inductance value is also of substantially equal.This inductance can with filtering common mode interference signal, but due to winding it Between leakage inductance it is very low, equivalent differential mode inductance amount is very low, and the filter effect of difference mode signal is bad.In order to reach the filter of DM EMI Ripple requirement is, it is necessary to additionally suppression of one inductance of series connection as difference mode signal on the line.No matter which is from component number From the aspect of, from the aspect of volume or cost from the aspect of can not all meet the needs of present situation.

As can be seen here, how to overcome component number excessive, it is this area skill to reduce the space of occupancy and reduce cost Art personnel's urgent problem to be solved.

Utility model content

The purpose of this utility model is to provide a kind of inductance, wave filter and electronic product for collecting common mode differential mode filtering one, Few with component number, the space of occupancy is small and reduces the advantages of low.

In order to solve the above technical problems, the utility model provides a kind of inductance for collecting common mode differential mode filtering one, including altogether Mould inductance, the difference for being wound in the first coil of the magnetic core both sides of the common mode inductance and the number of turn of the second coil are more than 0.

Preferably, in addition to the insulating part that is arranged between the first coil and the second coil.

Preferably, the insulating part is insulating paper.

Preferably, the magnetic core is annular or square.

In order to solve the above technical problems, the utility model also provides a kind of wave filter, including the filter of described collection common mode differential mode The inductance of ripple one.

In order to solve the above technical problems, the utility model also provides a kind of electronic product, including described wave filter.

Preferably, the electronic product is power module.

The inductance of collection common mode differential mode filtering one provided by the utility model includes common mode inductance, is wound in common mode inductance Magnetic core both sides first coil and the second coil the number of turn difference be more than 0.Due to first coil and the number of turn of the second coil Difference, therefore, on same inductance, i.e., it can realize that common mode filtering can also realize that differential mode filters.This inductance need not increase volume Outer differential mode inductance can but reach same differential mode filter effect, accomplish the integration of common mode differential mode inductance, and first device used with this Part negligible amounts, reduce cost and the space requirement of circuit board.

In addition, wave filter provided by the utility model and electronic product are equally with above-mentioned effective.

Brief description of the drawings

In order to illustrate more clearly of the utility model embodiment, letter will be done to the required accompanying drawing used in embodiment below Single introduction, it should be apparent that, drawings in the following description are only some embodiments of the utility model, general for this area For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is a kind of schematic diagram of inductance for collecting common mode differential mode filtering one provided by the utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describe, it is clear that described embodiment is only the utility model part of the embodiment, rather than all real Apply example.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made, institute The every other embodiment obtained, belongs to scope of protection of the utility model.

Core of the present utility model is to provide a kind of inductance, wave filter and electronic product for collecting common mode differential mode filtering one, Few with component number, the space of occupancy is small and reduces the advantages of low.

In order that those skilled in the art more fully understand the utility model, below in conjunction with the accompanying drawings and it is embodied The utility model is described in further detail for mode.

Fig. 1 is a kind of schematic diagram of inductance for collecting common mode differential mode filtering one provided by the utility model.As shown in figure 1, The inductance includes common mode inductance, is wound in the difference of the number of turn of the coil 3 of first coil 2 and second of the both sides of magnetic core 1 of common mode inductance Value is more than 0.

, it is necessary to carry out the coiling of coil, the coiling direction of the coil 3 of first coil 2 and second to magnetic core 1 in specific implementation It is different, it is necessary to explanation, the number of turn of the coil 3 of first coil 2 and second is different, the i.e. coil 3 of first coil 2 and second The difference of the number of turn is more than 0.It is understood that the difference of the number of turn of the coil 3 of first coil 2 and second can be according to actual conditions Depending on, for example, relevant with front-end circuit, the present embodiment is simultaneously not construed as limiting.As preferred embodiment, magnetic core 1 for annular or It is square.It is understood that annular is one of which application scenarios, it can only be annular or square not represent, as annular Or square size the present embodiment is not construed as limiting.

Concrete principle shown in Fig. 1 is：On the basis of common mode inductance, change the coil turn of the side of magnetic core 1 so that the One coil 2 is different with the number of turn of the second coil 3, and thus the inductance value deviation of generation both sides is larger, so as to increase common mode inductance The inductance value deviation of both sides, using the deviation as equivalent differential mode inductance amount, therefore, on the basis of being acted on common mode filtering, The effect of differential mode filtering can also be realized.

The inductance for the collection common mode differential mode filtering one that the present embodiment provides includes common mode inductance, is wound in the magnetic of common mode inductance The difference of the first coil of core both sides and the number of turn of the second coil is more than 0.Because first coil is different with the number of turn of the second coil, Therefore, on same inductance, i.e., it can realize that common mode filtering can also realize that differential mode filters.This inductance need not increase extra difference Mould inductance can but reach same differential mode filter effect, accomplish the integration of common mode differential mode inductance, and component number used with this It is less, reduce cost and the space requirement of circuit board.

In addition, in specific implementation, first coil and the second coil can cover copper coil, enamel insulated round copper wire line using PCB Circle, three-layer insulated coil, enamel-cover flat type copper wire coil or copper foil overlay film coil etc..Magnetic core can select the ceramics of high permeability characteristic Ferrite soft magnetic magnetic core is noncrystal or by the metal soft magnetic material with high Bs, high DC stacked characteristic.It is appreciated that Be, no matter first coil and the selection species of the second coil or the species of magnetic core, and the permeability of magnetic core is required for basis Actual connection Electric circuit selection.

On the basis of above-described embodiment, in addition to the insulating part being arranged between first coil and the second coil.As Preferably, insulating part is insulating paper.

It is understood that the effect of filtering can be improved by increasing insulating part.In addition, insulating part can be insulation Paper, other species, such as potsherd, the present embodiment can also be selected to repeat no more in other embodiments certainly.

The embodiment of the inductance of collection common mode differential mode filtering one, on this basis, this practicality is discussed in detail above New embodiment also provides a kind of wave filter of the inductance comprising collection common mode differential mode filtering one.It should be noted that the filtering Device is in addition to the inductance of collection common mode differential mode filtering one, in addition to other parts, may refer to prior art, the present embodiment is no longer Repeat.

Further, the utility model also provides a kind of electronic product on the basis of above-described embodiment, the electronic product Including wave filter and other devices.The structure of wave filter and structure the present embodiment of other devices repeat no more.As preferred Embodiment, electronic product is power module.

Inductance, wave filter and the electronic product of collection common mode differential mode filtering one provided by the utility model are carried out above It is discussed in detail.Each embodiment is described by the way of progressive in specification, what each embodiment stressed be and its The difference of his embodiment, between each embodiment identical similar portion mutually referring to.For dress disclosed in embodiment For putting, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is referring to method part Explanation.It should be pointed out that for those skilled in the art, before the utility model principle is not departed from Put, some improvement and modification can also be carried out to the utility model, these are improved and modification also falls into the utility model right It is required that protection domain in.

It should also be noted that, in this manual, such as first and second or the like relational terms be used merely to by One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged Except other identical element in the process including the key element, method, article or equipment being also present.

Claims (7)

1. a kind of inductance for collecting common mode differential mode filtering one, including common mode inductance, it is characterised in that be wound in the common mode inductance Magnetic core both sides first coil and the second coil the number of turn difference be more than 0.

2. the inductance of collection common mode differential mode filtering one according to claim 1, it is characterised in that also described including being arranged on Insulating part between first coil and the second coil.

3. the inductance of collection common mode differential mode filtering one according to claim 2, it is characterised in that the insulating part is insulation Paper.

4. the inductance of the collection common mode differential mode filtering one according to claim 1-3 any one, it is characterised in that the magnetic Core is annular or square.

5. a kind of wave filter, it is characterised in that including the collection common mode differential mode filtering one described in claim 1-4 any one Inductance.

6. a kind of electronic product, it is characterised in that including the wave filter described in claim 5.

7. electronic product according to claim 6, it is characterised in that the electronic product is power module.