CN2405380Y - Single stage filtering type synthesized common mode/different mode choke - Google Patents
Single stage filtering type synthesized common mode/different mode choke Download PDFInfo
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- CN2405380Y CN2405380Y CN 99257972 CN99257972U CN2405380Y CN 2405380 Y CN2405380 Y CN 2405380Y CN 99257972 CN99257972 CN 99257972 CN 99257972 U CN99257972 U CN 99257972U CN 2405380 Y CN2405380 Y CN 2405380Y
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Abstract
The utility model comprises two dumbbell-shaped magnetic cores. Two coils are respectively coiled on the two dumbbell-shaped magnetic cores, and thus, two electric inductors are formed. The self induction and the mutual induction of the two electric inductors respectively form a different mode electric inductor and a common mode electric inductor. When the utility model is used, the two coils are respectively connected with power supply lines. The utility model has the advantages of low cost and easy winding. The utility model can be used in a single level wave filter, and thus, the single level wave filter can simultaneously satisfy the wave flitting requirements of common mode and different mode noisy signals. Even though common mode and different mode decreasing amounts require different specific gravity, the wave filter can be used in a very large range. In addition, the wave filter can normally work.
Description
The utility model relates to a kind of choke of novelty.
There is a requirement of runing counter in choke at the filter that is used for common mode noise (CM) and differential mode noise (DM), and the design of the choke of this filter can suppress a noise wherein traditionally, but can't suppress two kinds of noises simultaneously.For filtering common mode effectively and differential mode noise, need in the filter of two different stages, use the smoothing choke of different designs.
The switching regulator electronic installation can produce suitable electromagnetic radiation.Need to use suitable filter to suppress this radiation, make to be coupled to main power line without any harmful noise.The noise of coupled modes generation can classify as two kinds of different types thus: common mode noise and differential mode noise.The differential mode noise is the hot line (Live wire) of striding main power source and the noise between the center line (Neutral wire), and the common mode noise is the noise over the ground on the hot line and the neutral line.
Must understand may be different at hot line and the neutral line voltage to earth of measuring out of the ordinary, and this is because still there is event simultaneously in the differential mode noise.In the case, common-mode voltage is meant the mean value of this two voltage.
For this reason, need to use following different design with noise of filtering common mode effectively and differential mode noise on the line:
Differential mode inductance is used for filtering differential mode noise, and as shown in Figure 1, its action is that a cross-line electric capacity is to form a LC filter.Storage capacitor 3,1 after this cross-line electric capacity comprises the X electric capacity 5 that is connected on the alternating current terminal and is connected on rectifier 4 in the DC circuit is that differential mode inductance, 2 is Switching Power Supply.Usually capacitance is quite big, so even the inductance value of differential mode inductance 1 is lower, still be enough to the noise of decaying.Attention is in this circuit, and noise electric current and the same direction of power electric current are so this inductance 1 need bear very big load current.It need be still unsaturated under so heavy magnetic bias, and this is the congenital restriction that differential mode inductance is difficult for making high inductance.
Common mode inductance is used for filtering common mode noise, and as shown in Figure 2, common mode inductance 6 and Y electric capacity 9,10 co-operation are to form a LC filter, and perhaps the common mode news source resistance with main circuit forms a LR filter jointly, and 7 is that common mode noise sources are represented in load, 8.Different with differential mode inductance is that common mode inductance 6 does not need to bear bias current.But because the requirement on the safety requirements, Y electric capacity is limited to low-voltage capacity, thereby the inductance of this type must have sizable inductance value, and big inductance value will damage the ability that common mode inductance bears bias current.
From on can find out that the needs of common mode and differential mode smoothing choke are far from it, on traditional magnetic design, the inductor of certain volume bears big bias current only, or has big inductance value, and can not have two characteristics simultaneously.
Need use different filters respectively to common mode noise and differential mode noise traditionally, owing to need two kinds of smoothing chokes, so need more assembly, occupy more space, cost also is higher than single-section filter.
Under the situation of low differential mode noise, might only use single-stage LC filter to carry out common mode and differential mode filtering simultaneously.As shown in Figure 3, using a synthetic CM/DM choke 12,13 between filter and load 11 is X electric capacity, and 14 is Y electric capacity, and 15 is Y electric capacity.This choke has the function of CM filter and DM filter simultaneously, and wherein single-section filter uses traditional common-mode inductor.Can reach the purpose of differential mode filtering via the leakage inductance of common-mode inductor, design common mode inductance enough big, and make between two common mode inductances and have leakage flux, this leakage flux will cause leakage inductance, and this leakage inductance is as the differential mode inductance differential mode noise that is enough to decay.But because under the design of traditional smoothing choke, leakage inductance is too low and can't carry out sufficient differential mode filtering, so method is only applicable under the favourable situation of minority.
In view of above-mentioned, the purpose of this utility model provides a kind of synthesized common mode/different mode choke of single-stage filtering, and it can satisfy the filtering requirements to common mode and differential mode noise simultaneously.
For reaching this purpose, the utility model by the following technical solutions:
This choke comprises the magnetic core of two dumb-bell shapes, two coils are wrapped in respectively on this two dumb-bell shapes magnetic core, so form two inductance, can utilize the self-induction of this two inductance and mutual inductance to form differential mode inductance and common mode inductance respectively, during use two dumb-bell shape coils are connected on the power supply line respectively.
In this choke, two dumb-bell shape magnetic cores can be placed the place, approximated position, to increase the common mode inductance amount via intercoupling.
In this choke, can grind off a part of dumb-bell shape magnetic core, make this two dumb-bell shapes magnetic core place more approaching position, can suitably increase intercoupling between two coils.
In this choke, comprise half magnetic core separately in the common mode magnetic-path, make coil can use traditional coil winding machine to place half magnetic core.Moulding to this half magnetic core that separates, make that when coil is on this magnetic core the inductance value of this coil (individually or in conjunction with the person) is enough to carry out differential mode filtering.
In this choke, separately half magnetic core moulding make when coil around last, and when both in conjunction with the time, the mutual inductance between this dumb-bell shape coil is enough to carry out common mode filtering.
In this choke, the number of turns that can adjust coil is to adjust common mode inductance and differential mode inductance.
The utility model has the advantages that: cost is low, be easy to twine, be applicable in the single-section filter.This single-section filter can satisfy the filtering requirements of common mode and differential mode noise simultaneously, and the scope of application is big, even still like this when requiring different specific weight is arranged for the common mode of filter and differential mode attenuation amount.
Below, lift the utility model preferred embodiment now and cooperate diagram to be described further.
Fig. 1 represents to be used for the mode of the differential mode inductance configuration of filtering differential mode noise.
Fig. 2 represents to be used for the mode of the common mode inductance configuration of filtering common mode noise.
Fig. 3 represents the configuration mode of synthesized common mode/different mode choke in circuit.
Fig. 4 represents the dumb-bell shape magnetic core of two coilings, and two magnetic cores are separated from each other.
Fig. 5 represents the dumb-bell shape magnetic core of two coilings, and two magnetic cores are close to each other.
Fig. 6 represents the dumb-bell shape magnetic cores of two coilings, two magnetic cores near and grind off partly outstanding position.
The utility model preferred embodiment explanation
As shown in Figure 4,, make this coil meet the inductance of differential mode filtering and the needs of magnetization biasing, produce self-induction separately at first to two dumb-bell shape magnetic cores 1 ' and 2 ' coiling.Then as shown in Figure 5, two dumb-bell shape magnetic cores are placed hand-to-hand position, the magnetic flux of this dumb-bell shape magnetic core will through one closely CM magnetic-path loop produce mutual inductance, and cause higher common mode inductance amount.
As shown in Figure 6,, the part of dumb-bell shape magnetic core can be ground off, make the two ends up and down of magnetic core form the scarce shape of circle, make when two dumb-bell shape coils place approaching position to have bigger contact area between the two in order further to promote common mode inductance.The contact-making surface of this increase will reduce the magnetic resistance on the common-mode path, and cause further increasing the common mode inductance amount.
Above Shuo Ming configuration mode has sufficient common mode and differential mode inductance, with the noise of filtering different types.When the differential mode inductance value is quite low, also can bear sizable load current.By the number of turns of adjustment coil and the contact area of two magnetic cores, just can freely adjust differential mode and common mode inductance amount respectively.For example magnetic core is made two half magnetic cores that can be combined into an integral body, but this half magnetic core divides half mould also to divide half mould up and down about can being, just comprise two and half magnetic cores separately like this in the common mode magnetic-path, make coil can use traditional (but not magnetic ring coil) coil winding machine to place half magnetic core.Moulding to this half magnetic core that separates, make that when coil is on this magnetic core the inductance value of this coil (individually or in conjunction with the person) is enough to carry out differential mode filtering.Separately half magnetic core moulding make when coil around last, and when both in conjunction with the time, the mutual inductance between this dumb-bell shape coil is enough to produce common mode filtering.Perhaps the number of turns with coil changes, to adjust common mode inductance and differential mode inductance.Therefore the utility model can meet the requirement of different differential modes and common mode attenuation amount, is used widely.
By above explanation as can be known, as long as can make coil produce self-induction and mutual inductance in the design of the present utility model, so the utility model can place after the rectifier or before, also can use on interchange or DC circuit.This type of configuration does not all influence the physical property of this choke.
Though to use specific example the utility model is described in the literary composition, but have the knack of present technique person and these example corrects can not departed from spirit of the present utility model and viewpoint, spirit of the present utility model and viewpoint are defined in the claim of appended claims application, but not are defined by above explanation.
Claims (5)
1. synthesized common mode/the different mode choke of a single-stage filtering, it is characterized in that: it comprises the magnetic core of two dumb-bell shapes, each winding around on two magnetic cores and constitute two inductance, the self-induction of two inductance and mutual inductance form differential mode inductance and common mode inductance respectively.
2. synthesized common mode/the different mode choke of single-section filter as claimed in claim 1 is characterized in that: described two dumb-bell shape magnetic cores place the place, approximated position, to increase the common mode inductance amount via intercoupling.
3. synthesized common mode/the different mode choke of single-section filter as claimed in claim 1 is characterized in that: the both ends of described two dumb-bell shape magnetic cores all are circle and lack shape, make two magnetic cores can place more approaching position and increase intercoupling between the two.
4. synthesized common mode/the different mode choke of single-section filter as claimed in claim 1, it is characterized in that: described two magnetic cores are for being combined into half magnetic core of an integral body, two coils place half and half magnetic core respectively, moulding to these half magnetic cores that separate, make that the inductance value of these coils is enough to carry out differential mode filtering when coil during around these magnetic cores.
5. synthesized common mode/the different mode choke of single-section filter as claimed in claim 4 is characterized in that: described these separately half magnetic core moulding make when coil around last, and when both in conjunction with the time, the mutual inductance between these coils is enough to produce common mode filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99257972 CN2405380Y (en) | 1999-12-27 | 1999-12-27 | Single stage filtering type synthesized common mode/different mode choke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99257972 CN2405380Y (en) | 1999-12-27 | 1999-12-27 | Single stage filtering type synthesized common mode/different mode choke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2405380Y true CN2405380Y (en) | 2000-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99257972 Expired - Lifetime CN2405380Y (en) | 1999-12-27 | 1999-12-27 | Single stage filtering type synthesized common mode/different mode choke |
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| Country | Link |
|---|---|
| CN (1) | CN2405380Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111430139A (en) * | 2020-05-12 | 2020-07-17 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Inductance array structure capable of being effectively integrated and mounted and implementation method |
| CN112771776A (en) * | 2018-09-27 | 2021-05-07 | Abb瑞士股份有限公司 | Apparatus for conversion between AC power and DC power |
| CN111430139B (en) * | 2020-05-12 | 2024-05-24 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Inductance array structure capable of being effectively integrated and installed and implementation method |
-
1999
- 1999-12-27 CN CN 99257972 patent/CN2405380Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112771776A (en) * | 2018-09-27 | 2021-05-07 | Abb瑞士股份有限公司 | Apparatus for conversion between AC power and DC power |
| CN111430139A (en) * | 2020-05-12 | 2020-07-17 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Inductance array structure capable of being effectively integrated and mounted and implementation method |
| CN111430139B (en) * | 2020-05-12 | 2024-05-24 | 天津职业技术师范大学(中国职业培训指导教师进修中心) | Inductance array structure capable of being effectively integrated and installed and implementation method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |