CN1212503A - Noise-cut filter for power converter - Google Patents
Noise-cut filter for power converter Download PDFInfo
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- CN1212503A CN1212503A CN98118517A CN98118517A CN1212503A CN 1212503 A CN1212503 A CN 1212503A CN 98118517 A CN98118517 A CN 98118517A CN 98118517 A CN98118517 A CN 98118517A CN 1212503 A CN1212503 A CN 1212503A
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- main circuit
- dielectric sheet
- spiral coil
- conductor
- noise
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
- H01P1/20345—Multilayer filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
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- Coils Or Transformers For Communication (AREA)
- Filters And Equalizers (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
A method of manufacturing a noise-cut filter having distributed inductances and distributed capacitances is produced wherein conductive spiral coil patterns are formed on the opposite surfaces of a dielectric sheet, such that the spiral coil patterns are aligned with each other in a direction perpendicular to the plane of the dielectric sheet, and a main circuit pattern is constructed by bonding a main circuit conductor to the spiral coil pattern formed on one of the opposite surfaces of the dielectric sheet. The main circuit conductor is formed by stamping with a punch press so that the conductor has a cross sectional area large enough to allow the passage of current of a main circuit, and has substantially the same shape as the spiral coil pattern. Further, a grounding wire is bonded to the spiral coil pattern formed on the other surface of the dielectric sheet, so that the grounding wire leads the current involving noises which flows from the main circuit pattern into the spiral coil pattern via the dielectric sheet, to a ground terminal.
Description
The present invention relates to be used for the noise-cut filter of power converter, relate in particular to and be used for filtering and constitute the noise-cut filter that is created in switching noise such as electric power such as inverter (power) converter when the switching manipulation of semiconductor switch device.
Semiconductor switch device such as power converters such as inverters is carried out switching manipulation based on drive signal, the pulse-width modulation (PWM) of these drive signals through being carried out to the carrier frequency in about 20 KHz scopes with several KHz.During switching manipulation, it is the switching noise of tens KHz that power converter produces frequency component.
In the frequency component of switching noise as mentioned above, frequency has adverse effect at 100 KHz or those higher components to external equipment.At this situation, various rules had been proposed power converter in recent years, in the hope of reducing or eliminating this adverse effect.In order to adapt to these rules, power converter is provided with suitable noise-cut filter.
A known example that is used for the noise-cut filter of power converter comprises the single capacitor of single reactor and film or sheet, and in reactor, live wire is wrapped in around the core that for example ferrite, non-crystaline amorphous metal or alloy crystalline etc. form.Reactor becomes L shaped with capacitor-coupled, the filter of the switching noise that produces when the switching manipulation with the semiconductor switch device that is provided for the filtering power converter.
List of references as one piece of prior art of the noise-cut filter of relevant power converter, at " Integrated Output Filter and Diode Snubber Foor Switchnode Power Converters ", IEEE, 1994, disclosed a kind of filter circuit with integrated plate-like structure among the pp.1240-1245, this structure comprises rectifier, RC muffler circuit and LC filter circuit.This list of references also is illustrated the basic skills of making each circuit.
In addition, " Integrated Filters For Switch-ModePower Supplies " as another prior art list of references, IEEE, 1995, disclosed three types the LC filter circuit that has different structure according to employed dielectric material wherein among the pp.809-816.Promptly, dielectric material is divided into the material that has ceramic structure and have non-ceramic structure, point out that also a kind of filter circuit with plate-like structure (BaTiO3 as dielectric material) is a kind of the type of ceramic material as dielectric material, and the two kinds of filter circuits in addition (tabular and use the vapor deposition type of plasma) with film like structures are a kind of the type of non-ceramic material as dielectric material.
Employed reactor has annular usually in the noise-cut filter of above-mentioned known type, and capacitor is the pin insert type and has the plane or cylindrical shape.In the time of on the printed panel that reactor and capacitor is installed to power converter inside, the volume summation of the required space of these two elements greater than each element is installed, thereby causes the reduction of efficiency of assembling.When being installed on the printed panel by this noise-cut filter of cloth bundle of lines that separates, will increase the number of coupling unit, and the mode of fixing each element undesirable complexity that will become.
Commercially available so-called sheet type or pin insert type combination LC filter comprise the inductor and the capacitor unit of combination, this filter has several MHz or higher cut-off frequency, and the required low usually approximately 150KHz that for example arrives of cut-off frequency of the switching noise that the filtering semiconductor switch device is produced when switching manipulation.So, the switching noise that commercially available filter can not the filtering semiconductor switch device be produced when switching manipulation.
In addition, in such as power converters such as inverters, expectation maybe needs to make several amperes electric current to flow through the noise-cut filter that is used for converter.So, saw with becoming originally with regard to current capacity, be difficult to commercially available combination LC filter as noise-cut filter.
The filter circuit that is disclosed in the list of references of above-mentioned two pieces of prior arts has the manufacture method complicated problems, and this makes these circuit not be suitable for actual use, and causes the increase of manufacturing cost.
Therefore, an object of the present invention is to provide and a kind ofly can handle low-frequency noise and guarantee the noise-cut filter of enough big current capacity.
Another object of the present invention provides a kind of cheap small-sized noise-cut filter with good operating reliability, makes this filter by being easily mounted to suitable circuitous pattern on-chip simple manufacture method.
In order to realize first purpose, the noise-cut filter that is provided comprises: with first dielectric sheet of tabular formation; The first and second spiral coil figures that on the apparent surface of first dielectric sheet, form respectively, thereby the first and second spiral coil figures are along aiming at mutually perpendicular to the direction on the first dielectric sheet plane, and the first and second spiral coil figures are stuck with paste by conduction and formed and have the function of inductor; By first main circuit conductor is bonded to the first main circuit figure that the first spiral coil figure that forms forms on the first dielectric sheet apparent surface's a surface, punching press by punch press forms first main circuit conductor, thereby the area of section of this conductor flows through even as big as the electric current that makes desirable value, and this conductor has basically and the identical shape of the first spiral coil figure; Link first earth connection of the second spiral coil figure that forms on another surface of first dielectric sheet away from the first main circuit figure, first earth connection is guiding earth terminal from the first main circuit figure into via the electric current that comprises noise that first dielectric sheet flows into the second spiral coil figure; Second dielectric sheet with tabular formation; The third and fourth spiral coil figure that on the apparent surface of second dielectric sheet, forms respectively, thereby the third and fourth spiral coil figure is along aiming at mutually perpendicular to the direction on the second dielectric sheet plane, and the third and fourth spiral coil figure is stuck with paste by conduction and formed and have the function of inductor; By second main circuit conductor is bonded to the second main circuit figure that the triple helical shape coil pattern that forms forms on the second dielectric sheet apparent surface's a surface, punching press by punch press forms second main circuit conductor, thereby the area of section of this conductor flows through even as big as the electric current that makes desirable value, and this conductor has basically and the identical shape of triple helical shape coil pattern; Link second earth connection of the 4th spiral coil figure that forms on another surface of second dielectric sheet away from the second main circuit figure, second earth connection is guiding earth terminal from the second main circuit figure into via the electric current that comprises noise that second dielectric sheet flows into the 4th spiral coil figure; And the insulation board that forms with tabular, this insulation board is inserted in first dielectric sheet that has the first main circuit figure and has on it between second dielectric sheet of the second main circuit figure; Wherein the end in the first main circuit conductor opposite end is linked the end in the second main circuit conductor opposite end, thereby the other end of first and second main circuit conductors is used separately as input and output, first dielectric sheet that has the first main circuit figure combines with second dielectric sheet that has the second main circuit figure, thereby the filter circuit with inductor function and capacitor function is provided.
In a preferred versions of the present invention, in first main circuit conductor and second main circuit conductor each all is coated with welding compound in advance, is bonded to respectively by conduction and sticks with paste first and the triple helical shape coil pattern that forms being coated with first main circuit conductor of welding compound and in the second leading body conductor each by welding.
In another preferred versions of the present invention, be coated with first main circuit conductor of welding compound and each in second main circuit conductor and have the stepped construction that comprises multilayer, have the stepped construction of the thickness that the desired profile area is provided thereby form.
According to another aspect of the present invention, a kind of noise-cut filter is provided, and it comprises as mentioned above a plurality of filter circuits of constituting, be assemblied in a plurality of cores of separating (a plurality of filter circuits are housed in this housing) in the housing and fill space between filter circuit and the core of separating with the resin material of seal casinghousing.
Resin material can be made of the macromolecule copolymer resin material that comprises the predetermined ratio inorganic filler.
Resin material can be made of silicone gel (silicone gel) and the macromolecule copolymer resin material that comprises the predetermined ratio inorganic filler.In the case, the macromolecule copolymer resin material is only filled an end parts at the input and output side place of each filter circuit in the enclosure interior space, and silicone gel is filled the remainder in the enclosure interior space.
Resin material can be made of silicone gel, can be on housing an end at the input and output side place of each filter circuit cap is set with fixing input and output side.
According to another aspect of the present invention, a kind of equipment that comprises power converter is provided, this power converter comprises switching device and aforesaid noise-cut filter, wherein noise-cut filter is linked the input stage or the output stage of power converter, thus the switching noise that the filtering switching device is produced when switching manipulation.
The present invention also provides a kind of equipment that comprises power converter, this power converter comprises switching device and the noise-cut filter that constitutes as mentioned above, wherein noise-cut filter is linked the circuit in the power converter, thus the switching noise that the filtering switching device is produced when switching manipulation.
According to another aspect of the present invention, a kind of method that is used to make noise-cut filter is provided, it may further comprise the steps: form the first and second spiral coil figures on the apparent surface of flat first dielectric sheet, thereby the first and second spiral coil figures are along aiming at mutually perpendicular to the direction on the first dielectric sheet plane, and the first and second spiral coil figures are stuck with paste by conduction and formed and have the function of inductor; Form the first main circuit figure by first main circuit conductor being bonded to the first spiral coil figure that on the first dielectric sheet apparent surface's a surface, forms, punching press by punch press forms first main circuit conductor, thereby the area of section of this conductor flows through even as big as the electric current that makes desirable value, and this conductor has basically and the identical shape of the first spiral coil figure; First earth connection is bonded to the second spiral coil figure that forms on another surface of first dielectric sheet away from the first main circuit figure, first earth connection is guiding earth terminal from the first main circuit figure into via the electric current that comprises noise that first dielectric sheet flows into the second spiral coil figure; On the apparent surface of flat second dielectric sheet, form the third and fourth spiral coil figure, thereby the third and fourth spiral coil figure is along aiming at mutually perpendicular to the direction on the second dielectric sheet plane, and the third and fourth spiral coil figure is stuck with paste by conduction and formed and have the function of inductor; Form the second main circuit figure by second main circuit conductor being bonded to the triple helical shape coil pattern that on the second dielectric sheet apparent surface's a surface, forms, punching press by punch press forms second main circuit conductor, thereby the area of section of this conductor flows through even as big as the electric current that makes desirable value, and this conductor has basically and the identical shape of triple helical shape coil pattern; Second earth connection is bonded to the 4th spiral coil figure that forms on another surface of second dielectric sheet away from the second main circuit figure, second earth connection is guiding earth terminal from the second main circuit figure into via the electric current that comprises noise that second dielectric sheet flows into the 4th spiral coil figure; And at first dielectric sheet that has the first main circuit figure and have and insert flat insulation board between second dielectric sheet of the second main circuit figure; Wherein an end of first main circuit conductor is linked an end of second main circuit conductor, thereby the other end of first and second main circuit conductors is used separately as input and output; First dielectric sheet that has the first main circuit figure combines with second dielectric sheet that has the second main circuit figure, thereby the filter circuit with inductor function and capacitor function is provided.
To the present invention be described in more detail with reference to some preferred embodiment of the present invention and accompanying drawing, wherein:
Fig. 1 (a) is each processing step that illustrates according to the noise-cut filter manufacture method of first embodiment of the invention to Fig. 1 (d);
Fig. 2 is the figure that is illustrated in a later processing step of Fig. 1 step in the manufacture method of noise-cut filter;
Fig. 3 is the figure that is illustrated in a later processing step of Fig. 2 step in the manufacture method of noise-cut filter;
Fig. 4 is the perspective view that the shape of through holes that the end parts by stamped coil forms is shown;
Fig. 5 is the perspective view that noise-cut filter basic structure is shown;
Fig. 6 is the circuit diagram that the constant lc circuit that distributes is shown;
Fig. 7 is the profile that illustrates according to the stamped coil that is coated with welding compound of second embodiment of the invention;
Fig. 8 illustrates the profile that stamped coil is laminated to the structure on the coil pattern that forms on the dielectric sheet;
Fig. 9 is the profile that illustrates according to the noise-cut filter structure of third embodiment of the invention, and wherein noise-cut filter is installed in the housing;
Figure 10 is the profile that illustrates according to the noise-cut filter structure of fourth embodiment of the invention, and wherein noise-cut filter is installed in the housing;
Figure 11 is the profile that illustrates according to the noise-cut filter structure of fifth embodiment of the invention, and wherein noise-cut filter is installed in the housing;
Figure 12 illustrates the three-phase noise-cut filter is linked block diagram according to the configuration of the power converter input stage of sixth embodiment of the invention;
Figure 13 illustrates the block diagram of the three-phase noise-cut filter being linked the configuration of power converter output stage; And
Figure 14 illustrates the block diagram that noise-cut filter is installed in the configuration in the power converter.
To describe preferred embodiments more of the present invention with reference to the accompanying drawings in detail.
At first will the first embodiment of the present invention be described referring to figs. 1 to Fig. 6.The manufacture method of foundation noise-cut filter of the present invention at first, is described referring to figs. 1 to Fig. 3.
In the processing step 1 shown in Fig. 1 (a), preparation is by such as BaTO
3Or the dielectric sheet 1 that forms of ferroelectric ceramic material such as PZT.The thickness of dielectric sheet 1 at 100 μ m in the 1mm scope.In the present embodiment, the thickness of dielectric sheet 1 is about 0.5mm.
Then, on the front and rear surfaces of dielectric sheet 1, form and stick with paste spiral coil figure 2a, the 2b that forms and play the inductor function, thereby coil pattern 2a, 2b edge is aimed at mutually perpendicular to the direction on the plane of dielectric sheet 1 by conduction.For example, conduction is stuck with paste and can be comprised Ag as main component.Though in the processing step 1 of Fig. 1 (a), solidify to form these figures on the dielectric sheet 1 then, but also can cement copper or other materials form these figures by sputter, vacuum evaporation or plating can conduction is stuck with paste to be added to by silk screen printing.
In the processing step 2 shown in Fig. 1 (b), be bonded on the coil pattern 2a that forms on the surface of dielectric sheet 1 forming and have the coil 3a identical shaped (that is first main circuit conductor) with coil pattern 2a by punching press by welding.Coil 3a that so is bonded together and coil pattern 2a provide the first main circuit figure 4a that plays inductor function and capacitor function.
Punching press by punch press forms coil 3a with copper coin or similar material, thereby coil 3a has the electric current of the main circuit of making (for example, the circuit of power converter) by the required area of section.Especially, the area of section of the stamped coil 3 of formation can be passed through coil 3a even as big as making 1A to tens ampere electric current, and its thickness is in 0.5mm arrives the 1.0mm scope.
Form elongation zone at the end of stamped coil 3a, this zone is outwards pulled out being installed on the printed wiring board that wherein inserts pin, thereby coil 3a links to each other with external circuit with certain-length.In Fig. 1 (b), use U
1Represent to be positioned at the elongation zone or the terminal of the above-mentioned end of coil 3a.
As shown in Figure 4, pass the other end of the stamped coil 3a that is positioned at coil central authorities and be positioned at that a part of dielectric sheet 1 is pre-formed through hole 7 below the coil 3a other end.Configuration can provide number enough big coil turn thus, can use the pin that inserts through hole 7 that coil pattern is linked to each other with other figures.
In the processing step 3 shown in Fig. 1 (c), the lead-in wire 2c of the ground connection figure that allows the noise component(s) electric current to pass through is bonded to the coil pattern 2b that on the surperficial facing surfaces of dielectric sheet 1 and the formation first main circuit figure 4a, forms by welding.Here, the noise component(s) electric current refers to the caused electric current of noise component(s) that produced by the electric current that flows through the first main circuit figure 4a when flowing into coil pattern 2a by dielectric sheet 1.
By carrying out processing step 1 to 3 as mentioned above, can be made into the substrate A that plays inductor and capacitor function, wherein formation has an end U on an above-mentioned surface of dielectric sheet 1
1The first main circuit figure 4a, on another surface of dielectric sheet 1, form coil pattern 2b with lead-in wire 2c.
In the processing step 4 shown in Fig. 1 (d), make the substrate B that has with above-mentioned substrate A analog structure.In the case, so constitute substrate B, thereby on a surface of dielectric sheet 5, form the second main circuit figure 4b, on another surface of dielectric sheet 5, form coil pattern 2b.End at the second main circuit figure 4b forms the elongation zone with certain-length, and this zone is drawn out dielectric sheet 5 and links to each other with external circuit.In Fig. 1 (d), use U
2Represent to be positioned at the elongation zone or the terminal of the above-mentioned end of coil 3b (that is second main circuit conductor) of coil pattern 4b.So the substrate B that constitutes plays the function of inductor and capacitor in the mode that is similar to substrate A.
In the processing step 4 of Fig. 1 (d), the insulation board 6 by interlayer is being connected with each other at the substrate B that forms the substrate A of the first main circuit figure 4a on the dielectric sheet 1 and form the 4b of the second main circuit figure on dielectric sheet 5.Layer insulation plate 6 is formed with through hole 7, and this through hole connects with the through hole 7 that passes substrate A, B formation.By the through hole 7 of formation like this, the pin of available insertion through hole 7 fixes substrate A, B by welding, thereby these two substrates are combined.So, can increase the number of turn of coil by the number that increases substrate.
By fixing substrate A, B with pin, can be electrically connected the inner end of the inner end of the first main circuit figure 4a and the second main circuit figure 4b mutually, thereby the first main circuit figure 4a connects with the second main circuit figure 4b with upper type.As a result, can be the end or the terminal U that outwards elongate from the first main circuit figure 4a
1With the end or the terminal U that outwards elongate from the second main circuit figure 4b
2As electric input and output side.
Be similar to the situation of coil pattern 2a (corresponding to the first main circuit figure 4a and the second main circuit figure 4b), also utilize the through hole (not shown) that the neutral earthing compensator figure 2b of substrate A, B is connected with each other.In Fig. 1 (d), represent the earth terminal of the neutral earthing compensator figure 2b that links to each other with P.Be formed for the through hole of the coil pattern 2a of main circuit in the position different, thereby these through holes are not overlapped with the lead to the hole site of the coil pattern 2b that is used for earthed circuit.
By carrying out processing step 1 to 4, combining,, a cover plays the noise-cut filter circuit 100 of inductor and capacitor function so that being provided at substrate A that forms the first main circuit figure 4a on first dielectric sheet 1 and the substrate B that on second dielectric sheet 5, forms the second main circuit figure 4b.In the case, the above-mentioned end of the first main circuit figure 4a is linked the corresponding end of the second main circuit figure 4b, thus can be the other end of the circuitous pattern 4a, the 4b that are not connected with each other as input U
1With output U
2
In processing step shown in Figure 25, preparation is by carrying out the two cover noise-cut filter circuit that processing step 1 to 4 is made.In Fig. 2, use U respectively
1And U
2The input and output side of the expression first cover noise-cut filter circuit 100 is used V
1And V
2The input and output side of the expression second cover noise-cut filter circuit 200.Insert insulation board 8 between the first cover noise-cut filter circuit 100 and the second cover noise-cut filter circuit 200, the layer that piles up in these two circuit is clipped between a pair of magnetic core that separates 9 along the direction perpendicular to these layer planes.The kit form of the magnetic core 9 that can separate as a result, (following will be called the magnetic core assembly) is installed in two cover noise-cut filter circuit 100,200 in the housing.
As shown in Figure 2, by one side formation opening 9a of magnetic core assembly 9, thereby can from magnetic core 9a, take out input and output side U by opening 9a
1, U
2And input and output side V
1, V
2Lead-in wire.For example, magnetic core 9 can be formed by ferrite.In addition, the middle body at each magnetic core 9 inner surface is formed for making each layer location of filter circuit 100,200 and fixing protruding 9b.
If between the magnetic core 9 that separates, insert two cover noise-cut filter circuit, then can form single phase filter, it has the common mode reactor that is used for linear filter and the combining structure of ground capacitor.If between magnetic core 9, insert three cover noise-cut filter circuit, then can form Three-phase electric-wave filter with same structure.
In the processing step 6 of Fig. 3, the opening 9a of the magnetic core assembly 9 by two cover noise-cut filter circuit, 100,200 (single phase filter is provided) are housed, space or space macromolecule copolymer resin material 10 injects in the housings make its curing then.For the noise-cut filter circuit of installing in this way 100,200, can pull out the lead end that is used for two-phase by the opening 9a of magnetic core assembly 9, i.e. the input and output side U of the first main circuit figure of noise-cut filter circuit 100
1, U
2And the input and output side V of the second main circuit figure of noise-cut filter circuit 200
1, V
2Can utilize pin to insert or mounted on surface, the lead end that so stretches out is bonded on the socket or similar device of printed wiring board by welding.So lead end combines with substrate can form single encapsulation.
Then the electrology characteristic of substrate structure will be described with reference to figure 5 and Fig. 6.In Fig. 5, play the area of section that the first main circuit figure 4a of the conductor effect of inductor had even as big as electric current by power converter (not shown) main circuit.The first main circuit figure 4a sticks with paste the coil pattern 2a form by conduction on the dielectric sheet 1 and constitutes by the coil 3a that the punching press electric conducting material forms.On dielectric sheet 1, form the coil pattern 2b that plays the earthing conductor effect, thereby coil pattern 2b is along aiming at the first main circuit figure 4a perpendicular to the direction on dielectric sheet 1 plane.
Because the coil pattern 2b that plays the earthing conductor effect only need guide the noise component(s) electric current that flows through dielectric sheet 1 into earth terminal, so can make the area of section of coil pattern 2b do less than the area of section of the first main circuit figure 4a.The substrate structure of the second main circuit figure 4b is similar to the substrate structure of the first main circuit figure 4a, therefore is not described.
In Fig. 6, play the terminal U of the first main circuit figure 4a of inductor conductor effect
1, U
2Have suitable length, thereby small inductance continuous distribution is arranged in terminal U
1, U
2Length on.Equally, there is small inductance to distribute along the coil pattern 2b that plays the earthing conductor effect.Because the first main circuit figure 4a and coil pattern 2b aim at and have inserted dielectric sheet 1 mutually therebetween, thus small electric capacity between figure 4a and 2b, formed continuously, in having provided distribution constant circuit with functions of low-pass filter.Expectation cut-off frequency (for example 150kHz or higher) that low pass filter had is enough to filtering by constituting the switching noise that produces such as the switching manipulation of the semiconductor switch device of power converters such as inverter.
Then will the second embodiment of the present invention be described with reference to figure 7 and 8.
Fig. 7 is a profile, wherein by coating welding compound 11 is added to as the first main circuit figure 4a or the stamped coil 3a of second a main circuit figure 4b part or the surface of 3b.Can be from welding compound 11 such as selection coating coil 3a or 3b the alloys such as Sn/Pb and Sn/Ag.Can easily be welded to the stamped coil 3a of coating welding compound 11 like this or 3b in aforesaid processing step 2 by on the formed coil pattern 2a of conduction paste.
Fig. 8 illustrates an example, and is wherein stacked together and be bonded on the dielectric sheet 1 on the coil pattern 2a that forms the two-layer stamped coil 3a that is coated with welding compound 11.By so mutual stacked stamped coil 3a, can easily increase current capacity by coil 3a.Also can be stacked three layers or more multi-layered stamped coil 3a.
Referring now to Fig. 9 the third embodiment of the present invention is described.
Fig. 9 illustrates the structure of a noise-cut filter, wherein two cover noise-cut filter circuit 100,200 is installed in the magnetic core assembly 9.In the present embodiment, use the macromolecule copolymer resin material 10 different to fill space between magnetic core assembly 9 and the noise-cut filter circuit 100,200 with the embodiment of Fig. 3, thus the sealing filter circuit.
Employed macromolecule copolymer resin material 10 can be made of the epoxy resin, urethane resin or the similar material that are added with such as inorganic fillers such as quartz powder or aluminium powders in the present embodiment.The thermal coefficient of expansion of macromolecule copolymer resin material 10 must equal the thermal coefficient of expansion of magnetic core 9, thereby avoids the caused tension force of thermal stress.
Use aforesaid macromolecule copolymer resin material 10 to seal magnetic core assembly 9, improved the insulation characterisitic of filter, and can prevent that noise-cut filter circuit 100,200 from being stain by dust or other impurity of otherwise entering magnetic core assembly 9 by opening 9a, thereby prevent the reduction of insulating capacity.
But inorganic filler is added to macromolecule copolymer resin material 10 makes noise-cut filter circuit 100,200 dissipative flows cross their heat that electric current produced.In addition, fix the lead end U of the first main circuit figure 4a by the macromolecule copolymer resin material 10 of the above-mentioned type
1, U
2And the lead end V of the second main circuit figure 4b
1, V
2By the lead end of fix in position like this, even there is being external force to be added to the lead end U of stamped coil 3
1, U
2And V
1, V
2The time, also can prevent from this external force is added to the noise-cut filter circuit of imbedding in the resin material 10 100,200.
To be described with reference to Figure 10 the fourth embodiment of the present invention.
Figure 10 is illustrated in the structure that two cover noise-cut filter circuit 100,200 are housed in the magnetic core assembly 9 separately.In the present embodiment, the space between silicone gel 11 filling magnetic core assemblies 9 that are used to seal and the noise-cut filter circuit 100,200, thereby gel 11 is filled into opening 9a to be separated a little, and the macromolecule copolymer resin material 10 that is used to seal is filled into its complementary space of silicone gel 11 tops with opening 9a and flushes, and makes resin material 10 be exposed to the outside of magnetic core assembly 9.Can from above-mentioned material, select macromolecule copolymer resin material 10.
By suitably selecting to be used for the inner and surperficial material of seal casinghousing, improved insulation characterisitic, and can prevent that noise-cut filter circuit 100,200 from being stain by dust or other impurity of otherwise entering housing by opening 9a, thereby prevent the decline of insulation characterisitic.
It is favourable using the low relatively silicone gel 11 of modulus of elasticity, and this is because can not guarantee the raising of Mechanical Reliability because of thermal stress causes tension force.In addition, make the lead end U of the first main circuit figure 4a with macromolecule copolymer resin material 10
1, U
2Lead end V with the second main circuit figure 4b
1, V
2Fix in position, thereby, even there is external force to be added to lead end U
1, U
2And V
1, V
2, also can advantageously prevent from this external force is added to the noise-cut filter circuit 100,200 of magnetic core assembly 9 inside.
To be described with reference to Figure 11 the fifth embodiment of the present invention.Figure 11 illustrates the structure that two cover noise-cut filter circuit 100,200 are contained in the magnetic core assembly 9.In the present embodiment, the silicone gel 11 that is used to seal is filled into the space between magnetic core assembly 9 and the noise-cut filter circuit 100,200 with opening 9a and flushes, and by terminal fixedly cap 12 cover opening 9a, thereby by cap 12 the lead end U of the first main circuit figure 4a
1, U
2Lead end V with the second main circuit figure 4b
1, V
2Fix in position.
The cap 12 that is used for fixing terminal has been arranged, even there is external force to be added to lead end U
1, U
2And V
1, V
2, also can prevent from this external force is added to the noise-cut filter circuit 100,200 that places in the magnetic core assembly 9.In addition, can prevent that noise-cut filter circuit 100,200 from being stain by dust or other impurity of otherwise entering magnetic core assembly 9 by opening 9a, thereby prevent the decline of insulation characterisitic.The cap 12 that is used for fixing terminal is by forming such as PPS (polyphenylene sulfide) or PBT high molecular polymer resin materials such as (polybutyleneterephthalates).
Then will describe the sixth embodiment of the present invention in detail referring to figs. 12 to Figure 14.
Figure 12 illustrates an example, wherein the three cover noise-cut filter circuit 100,200 and 300 input stages that are arranged on such as power converters such as inverter 20 that are used for the three-phase noise-cut filter.
Though in the embodiment of Figure 11, the noise-cut filter circuit 100,200 that is used for single phase filter is contained in magnetic core assembly 9 at Fig. 1, but also can be in the processing step 5 of Fig. 2 another noise-cut filter circuit 300 be installed in below the noise-cut filter circuit 200, thereby the three-phase noise-cut filter is provided.
In the noise-cut filter that so constitutes, noise-cut filter circuit 100 comprises lead end U
1, U
2, noise-cut filter circuit 200 comprises lead end V
1, V
2, and noise-cut filter circuit 300 comprises lead end W
1, W
2Lead end U
1, V
1, W
1Link terminal 21a, 21b, the 21c of external circuit respectively, lead end U
2, V
2, W
2 Link power converter 20.
The lead end that connection like this has been arranged, make 100,200, the 300 energy filtering meetings of noise-cut filter circuit otherwise be transmitted into the low-frequency noise of power converter 20, also can prevent from the switching noise that switching device produced of power converter 20 is transferred to terminal 21a, 21b, 21c with signal from terminal 21a, 21b, 21c.
Figure 13 illustrates an example, wherein overlapping noise-cut filter circuit 100,200,300 output stages that are arranged on such as power converters such as inverter 20 according to three of the Three-phase electric-wave filter that is used for of the present invention.
Lead end U
1, V
1, W
1 Link power converter 20, lead end U
2, V
2, W
2Link terminal 22a, 22b, the 22c of external circuit.By the lead end that connects in this way, make noise-cut filter circuit 100,200,300 can filterings by the switching noise that switching device produced and other noises of power converter 20, thereby prevent from switching noise is transferred to terminal 22a, 22b, 22c from power converter 20.In addition, but 100,200,300 filterings of noise-cut filter circuit enter power converter 20 from terminal 22a, 22b, 22c low-frequency noise.
Figure 14 illustrates an example, wherein two cover noise-cut filter circuit 100,200 is arranged on such as power converters such as inverter 20 inside.
By the lead end U that connects in this way
1, U
2And V
2, V
2But, make the switching noise that the semiconductor switch device 24 of noise-cut filter circuit 100,200 filtering power converters 20 is produced when switching manipulation.
As mentioned above, according to the present invention, on the apparent surface of dielectric sheet, form and stick with paste the helical conductor figure that forms and have the inductor function by conduction, thereby these conductor figs constitute the main circuit figure along aiming at mutually perpendicular to the direction on dielectric sheet plane by conductor being bonded to the conductor fig that forms on the surface in the dielectric sheet apparent surface.Punching press by punch press forms conductor, thereby the area of section that this conductor had flows through even as big as the electric current that makes desirable value, and this conductor also has the shape substantially the same with the spiral coil figure.In addition, earth connection is bonded to the conductor fig that forms on another surface of dielectric sheet, thereby earth connection is guiding earth terminal from the main circuit figure into via the electric current that comprises noise that dielectric sheet flows into conductor fig.So, the filter circuit with inductor and capacitor function is provided, the filtering or cut down low-frequency noises such as switching noise fully of this circuit such as power converter, and power converter required several amperes or bigger electric current are passed through.
According to manufacture method of the present invention, a plurality of noise-cut filter circuit are contained in or are encapsulated in the magnetic core assembly, then with space or space in the macromolecule copolymer resin material filling magnetic core assembly, thus the sealing filter.So, can easily produce cheap small-sized noise-cut filter by simple manufacturing process, thereby can easily be installed in this noise-cut filter on the printed wiring board, guarantee the reliable part of good insulation characterisitic and machinery simultaneously.
Claims (16)
1. noise-cut filter is characterized in that comprising:
First dielectric sheet with tabular formation;
The first and second spiral coil figures that on the apparent surface of described first dielectric sheet, form respectively, thereby the first and second spiral coil figures are along aiming at mutually perpendicular to the direction on the first dielectric sheet plane, and the described first and second spiral coil figures are stuck with paste by conduction and formed and have the function of inductor;
By first main circuit conductor is bonded to the first main circuit figure that the described first spiral coil figure that forms forms on the described first dielectric sheet apparent surface's a surface, punching press by punch press forms described first main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of the first spiral coil figure;
Be bonded to first earth connection of the described second spiral coil figure that forms on another surface of described first dielectric sheet away from the described first main circuit figure, described first earth connection is guiding earth terminal from the first main circuit figure into via the electric current that comprises noise that described first dielectric sheet flows into the second spiral coil figure;
Second dielectric sheet with tabular formation;
The third and fourth spiral coil figure that on the apparent surface of described second dielectric sheet, forms respectively, thereby the third and fourth spiral coil figure is along aiming at mutually perpendicular to the direction on the second dielectric sheet plane, and the described third and fourth spiral coil figure is stuck with paste by conduction and formed and have the function of inductor;
By second main circuit conductor is bonded to the second main circuit figure that the described triple helical shape coil pattern that forms forms on the described second dielectric sheet apparent surface's a surface, punching press by punch press forms described second main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of triple helical shape coil pattern;
Be bonded to second earth connection of described the 4th spiral coil figure that forms on another surface of described second dielectric sheet away from the described second main circuit figure, described second earth connection is guiding earth terminal from the second main circuit figure into via the electric current that comprises noise that described second dielectric sheet flows into the 4th spiral coil figure; And
With the insulation board that tabular forms, described insulation board is inserted in described first dielectric sheet that has the described first main circuit figure and has on it between described second dielectric sheet of the described second main circuit figure;
End in the wherein said first main circuit conductor opposite end is linked the end in the described second main circuit conductor opposite end, thereby the other end of first and second main circuit conductors is used separately as input and output, and
First dielectric sheet that has the first main circuit figure combines with second dielectric sheet that has the second main circuit figure, thereby the filter circuit with inductor function and capacitor function is provided.
2. noise-cut filter as claimed in claim 1, it is characterized in that in described first main circuit conductor and described second main circuit conductor each all is coated with welding compound in advance, be bonded to respectively by conduction and stick with paste first and the triple helical shape coil pattern that forms being coated with first main circuit conductor of welding compound and in second main circuit conductor each by welding.
3. noise-cut filter as claimed in claim 2, it is characterized in that being coated with first main circuit conductor of welding compound and each in second main circuit conductor has the stepped construction that comprises multilayer, have the stepped construction of the thickness that the desired profile area is provided thereby form.
4. noise-cut filter is characterized in that comprising:
A plurality of filter circuits;
Be assemblied in a plurality of cores of separating in the housing, described a plurality of filter circuit is housed in described housing; And
Fill space between filter circuit and the core of separating with the resin material of seal casinghousing;
In wherein said a plurality of filter circuit each comprises:
First dielectric sheet with tabular formation;
The first and second spiral coil figures that on the apparent surface of described first dielectric sheet, form respectively, thereby the first and second spiral coil figures are along aiming at mutually perpendicular to the direction on the first dielectric sheet plane, and the described first and second spiral coil figures are stuck with paste by conduction and formed and have the function of inductor;
By first main circuit conductor is bonded to the first main circuit figure that the described first spiral coil figure that forms forms on the described first dielectric sheet apparent surface's a surface, punching press by punch press forms described first main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of the first spiral coil figure;
Link first earth connection of the described second spiral coil figure that forms on another surface of described first dielectric sheet away from the described first main circuit figure, described first earth connection is guiding earth terminal from the first main circuit figure into via the electric current that comprises noise that described first dielectric sheet flows into the second spiral coil figure;
Second dielectric sheet with tabular formation;
The third and fourth spiral coil figure that on the apparent surface of described second dielectric sheet, forms respectively, thereby the third and fourth spiral coil figure is along aiming at mutually perpendicular to the direction on the second dielectric sheet plane, and the described third and fourth spiral coil figure is stuck with paste by conduction and formed and have the function of inductor;
By second main circuit conductor is bonded to the second main circuit figure that the described triple helical shape coil pattern that forms forms on the described second dielectric sheet apparent surface's a surface, punching press by punch press forms described second main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of triple helical shape coil pattern;
Link second earth connection of described the 4th spiral coil figure that forms on another surface of described second dielectric sheet away from the described second main circuit figure, described second earth connection is guiding earth terminal from the second main circuit figure into via the electric current that comprises noise that described second dielectric sheet flows into the 4th spiral coil figure; And
With the insulation board that tabular forms, described insulation board is inserted in described first dielectric sheet that has the described first main circuit figure and has on it between described second dielectric sheet of the described second main circuit figure;
End in the wherein said first main circuit conductor opposite end is linked the end in the described second main circuit conductor opposite end, thereby the other end of first and second main circuit conductors is used separately as input and output, and
First dielectric sheet that has the first main circuit figure combines with second dielectric sheet that has the second main circuit figure, thereby each the described filter circuit with inductor function and capacitor function is provided.
5. noise-cut filter as claimed in claim 4 is characterized in that described resin material comprises the macromolecule copolymer resin material that comprises the predetermined ratio inorganic filler.
6. noise-cut filter as claimed in claim 4, it is characterized in that the macromolecule copolymer resin material that described resin material comprises silicone gel and comprises the predetermined ratio inorganic filler, described macromolecule copolymer resin material is only filled an end parts at the input and output side place of each filter circuit in the enclosure interior space, and described silicone gel is filled the remainder in the enclosure interior space.
7. noise-cut filter as claimed in claim 4, the cap of an end that it is characterized in that also comprising the input and output side place that is arranged on each filter circuit on the housing is in order to fixing input and output side, and wherein said resin material comprises silicone gel.
8. one kind comprises power converter and as the equipment of each described noise-cut filter among the claim 1-7, described power converter comprises switching device, wherein said noise-cut filter is linked the input stage and the output stage of power converter, thus the switching noise that filtering is produced when switching device is done switching manipulation.
9. one kind comprises power converter and as the equipment of each described noise-cut filter among the claim 1-7, described power converter comprises switching device, wherein noise-cut filter is linked the circuit in the power converter, thus the switching noise that filtering is produced when switching device is done switching manipulation.
10. method of making noise-cut filter is characterized in that may further comprise the steps:
On the apparent surface of flat first dielectric sheet, form the first and second spiral coil figures, thereby the first and second spiral coil figures are along aiming at mutually perpendicular to the direction on the first dielectric sheet plane, and the described first and second spiral coil figures are stuck with paste by conduction and formed and have the function of inductor;
Form the first main circuit figure by first main circuit conductor being bonded to the described first spiral coil figure that on the described first dielectric sheet apparent surface's a surface, forms, punching press by punch press forms described first main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of the first spiral coil figure;
First earth connection is bonded to the described second spiral coil figure that forms on another surface of described first dielectric sheet away from the described first main circuit figure, described first earth connection is guiding earth terminal from the first main circuit figure into via the electric current that comprises noise that described first dielectric sheet flows into the second spiral coil figure;
On the apparent surface of flat second dielectric sheet, form the third and fourth spiral coil figure, thereby the third and fourth spiral coil figure is along aiming at mutually perpendicular to the direction on the second dielectric sheet plane, and the described third and fourth spiral coil figure is stuck with paste by conduction and formed and have the function of inductor;
Form the second main circuit figure by second main circuit conductor being bonded to the described triple helical shape coil pattern that on the described second dielectric sheet apparent surface's a surface, forms, punching press by punch press forms described second main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of triple helical shape coil pattern;
Second earth connection is bonded to described the 4th spiral coil figure that forms on another surface of described second dielectric sheet away from the described second main circuit figure, described second earth connection is guiding earth terminal from the second main circuit figure into via the electric current that comprises noise that described second dielectric sheet flows into the 4th spiral coil figure; And
At described first dielectric sheet that has the described first main circuit figure and have and insert flat insulation board between described second dielectric sheet of the described second main circuit figure;
One end of wherein said first main circuit conductor is linked an end of described second main circuit conductor, thereby the other end of first and second main circuit conductors is used separately as input and output;
First dielectric sheet that has the first main circuit figure combines with second dielectric sheet that has the second main circuit figure, thereby the filter circuit with inductor function and capacitor function is provided.
11. the method for manufacturing noise-cut filter as claimed in claim 10 is characterized in that further comprising the steps of:
Apply in described first main circuit figure and the described second main circuit figure each with welding compound; And
First main circuit conductor that is coated with welding compound and second main circuit conductor are welded to the first spiral coil figure and the triple helical shape coil pattern that is formed by the conduction paste respectively.
12. the method for manufacturing noise-cut filter as claimed in claim 11, it is characterized in that being coated with first main circuit conductor of welding compound and each in second main circuit conductor has the stepped construction that comprises multilayer, have the stepped construction of the thickness that the desired profile area is provided thereby form.
13. a method of making noise-cut filter is characterized in that may further comprise the steps:
Prepare a plurality of filter circuits;
Described a plurality of filter circuits are contained in the inside to be assembled with in the housing of a plurality of cores of separating; And
Fill space between filter circuit and the core of separating with the resin material of seal casinghousing;
Wherein make in described a plurality of filter circuit each by the method that may further comprise the steps:
On the apparent surface of flat first dielectric sheet, form the first and second spiral coil figures, thereby the first and second spiral coil figures are along aiming at mutually perpendicular to the direction on the first dielectric sheet plane, and the described first and second spiral coil figures are stuck with paste by conduction and formed and have the function of inductor;
Form the first main circuit figure by first main circuit conductor being bonded to the described first spiral coil figure that on the described first dielectric sheet apparent surface's a surface, forms, punching press by punch press forms described first main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of the first spiral coil figure;
First earth connection is bonded to the described second spiral coil figure that forms on another surface of described first dielectric sheet away from the described first main circuit figure, described first earth connection is guiding earth terminal from the first main circuit figure into via the electric current that comprises noise that described first dielectric sheet flows into the second spiral coil figure;
On the apparent surface of flat second dielectric sheet, form the third and fourth spiral coil figure, thereby the third and fourth spiral coil figure is along aiming at mutually perpendicular to the direction on the second dielectric sheet plane, and the described third and fourth spiral coil figure is stuck with paste by conduction and formed and have the function of inductor;
Form the second main circuit figure by second main circuit conductor being bonded to the described triple helical shape coil pattern that on the described second dielectric sheet apparent surface's a surface, forms, punching press by punch press forms described second main circuit conductor, thereby the area of section of described conductor flows through even as big as the electric current that makes desirable value, and described conductor has basically and the identical shape of triple helical shape coil pattern;
Second earth connection is bonded to described the 4th spiral coil figure that forms on another surface of described second dielectric sheet away from the described second main circuit figure, described second earth connection is guiding earth terminal from the second main circuit figure into via the electric current that comprises noise that described second dielectric sheet flows into the 4th spiral coil figure; And
At described first dielectric sheet that has the described first main circuit figure and have and insert flat insulation board between described second dielectric sheet of the described second main circuit figure;
One end of wherein said first main circuit conductor is linked an end of described second main circuit conductor, thereby the other end of first and second main circuit conductors is used separately as input and output;
First dielectric sheet that has the first main circuit figure combines with second dielectric sheet that has the second main circuit figure, thereby each filter circuit with inductor function and capacitor function is provided.
14. the method as manufacturing noise-cut filter as described in the claim 13 is characterized in that described resin material comprises the macromolecule copolymer resin material that comprises the predetermined ratio inorganic filler.
15. method as manufacturing noise-cut filter as described in the claim 13, it is characterized in that the macromolecule copolymer resin material that described resin material comprises silicone gel and comprises the predetermined ratio inorganic filler, described macromolecule copolymer resin material is only filled an end parts at the input and output side place of each filter circuit in the enclosure interior space, and described silicone gel is filled the remainder in the enclosure interior space.
16. the method as manufacturing noise-cut filter as described in the claim 13 is characterized in that described resin material comprises silicone gel, an end at the input and output side place of each filter circuit is provided with cap with fixing input and output side on housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23308097A JP3287544B2 (en) | 1997-08-28 | 1997-08-28 | Noise filter |
| JP233080/97 | 1997-08-28 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510067396A Division CN100585992C (en) | 1997-08-28 | 1998-08-28 | Noise-cut filter for power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1212503A true CN1212503A (en) | 1999-03-31 |
| CN1229915C CN1229915C (en) | 2005-11-30 |
Family
ID=16949494
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981185177A Expired - Fee Related CN1229915C (en) | 1997-08-28 | 1998-08-28 | Noise-cut filter for power converter |
| CN200510067396A Expired - Fee Related CN100585992C (en) | 1997-08-28 | 1998-08-28 | Noise-cut filter for power converter |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510067396A Expired - Fee Related CN100585992C (en) | 1997-08-28 | 1998-08-28 | Noise-cut filter for power converter |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3287544B2 (en) |
| KR (1) | KR100469117B1 (en) |
| CN (2) | CN1229915C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212860B (en) * | 2006-12-29 | 2010-04-07 | 英业达股份有限公司 | Electromagnetic energy gap structure and multi-layer printed circuit board with the electromagnetic energy gap structure |
| CN103681539A (en) * | 2013-12-18 | 2014-03-26 | 江阴长电先进封装有限公司 | Packaging structure and packaging method of integrated common mode choke |
| CN105099089A (en) * | 2014-04-30 | 2015-11-25 | 德昌电机(深圳)有限公司 | Radio frequency filter and motor with radio frequency filter |
| CN105322783A (en) * | 2014-07-28 | 2016-02-10 | 现代自动车株式会社 | Power module printed circuit board |
| US9478976B2 (en) | 2013-05-24 | 2016-10-25 | Innochips Technology Co., Ltd. | Circuit protection device |
| CN106050560A (en) * | 2016-06-20 | 2016-10-26 | 大唐（赤峰）新能源有限公司 | Chip inductor and detecting device for wind turbine generator overspeed protection system |
| CN107925392A (en) * | 2015-07-21 | 2018-04-17 | 株式会社自动网络技术研究所 | Conductive path with noise filter |
| CN109196763A (en) * | 2016-06-02 | 2019-01-11 | 日产自动车株式会社 | Power inverter |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3680627B2 (en) * | 1999-04-27 | 2005-08-10 | 富士電機機器制御株式会社 | Noise filter |
| JP2013219919A (en) * | 2012-04-09 | 2013-10-24 | Mitsubishi Electric Corp | Noise reduction filter and electric power conversion device using the same |
| JP6422204B2 (en) * | 2013-06-20 | 2018-11-14 | 株式会社不二工機 | Stator unit |
| JP6445810B2 (en) * | 2014-09-02 | 2018-12-26 | 田淵電機株式会社 | Interleaving choke coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4844755A (en) * | 1971-10-07 | 1973-06-27 | ||
| JPS5952620U (en) * | 1982-09-29 | 1984-04-06 | 株式会社村田製作所 | noise removal filter |
| JPS59152606A (en) * | 1983-02-21 | 1984-08-31 | Nippon Ferrite Ltd | Printed coil |
| JPS62233911A (en) * | 1986-04-03 | 1987-10-14 | Matsushita Electric Ind Co Ltd | Low-pass filter |
| JP2999494B2 (en) * | 1990-01-17 | 2000-01-17 | 毅 池田 | Laminated LC noise filter and method of manufacturing the same |
| JPH0677755A (en) * | 1992-08-28 | 1994-03-18 | Takeshi Ikeda | Noise filter and its manufacture |
| JPH073125U (en) * | 1993-06-08 | 1995-01-17 | トップ電子株式会社 | Common mode choke coil parts and EMI noise filter |
-
1997
- 1997-08-28 JP JP23308097A patent/JP3287544B2/en not_active Expired - Fee Related
-
1998
- 1998-08-26 KR KR10-1998-0034547A patent/KR100469117B1/en not_active IP Right Cessation
- 1998-08-28 CN CNB981185177A patent/CN1229915C/en not_active Expired - Fee Related
- 1998-08-28 CN CN200510067396A patent/CN100585992C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212860B (en) * | 2006-12-29 | 2010-04-07 | 英业达股份有限公司 | Electromagnetic energy gap structure and multi-layer printed circuit board with the electromagnetic energy gap structure |
| US9478976B2 (en) | 2013-05-24 | 2016-10-25 | Innochips Technology Co., Ltd. | Circuit protection device |
| CN104184430B (en) * | 2013-05-24 | 2017-06-13 | 英诺晶片科技股份有限公司 | Circuit protection device |
| CN103681539A (en) * | 2013-12-18 | 2014-03-26 | 江阴长电先进封装有限公司 | Packaging structure and packaging method of integrated common mode choke |
| CN103681539B (en) * | 2013-12-18 | 2016-06-08 | 江阴长电先进封装有限公司 | Packaging structure and packaging method of integrated common-mode inductor |
| CN105099089A (en) * | 2014-04-30 | 2015-11-25 | 德昌电机(深圳)有限公司 | Radio frequency filter and motor with radio frequency filter |
| CN105322783A (en) * | 2014-07-28 | 2016-02-10 | 现代自动车株式会社 | Power module printed circuit board |
| CN105322783B (en) * | 2014-07-28 | 2019-06-25 | 现代自动车株式会社 | Power module printed circuit board |
| CN107925392A (en) * | 2015-07-21 | 2018-04-17 | 株式会社自动网络技术研究所 | Conductive path with noise filter |
| CN109196763A (en) * | 2016-06-02 | 2019-01-11 | 日产自动车株式会社 | Power inverter |
| CN106050560A (en) * | 2016-06-20 | 2016-10-26 | 大唐（赤峰）新能源有限公司 | Chip inductor and detecting device for wind turbine generator overspeed protection system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3287544B2 (en) | 2002-06-04 |
| JPH1174748A (en) | 1999-03-16 |
| CN100585992C (en) | 2010-01-27 |
| KR19990023869A (en) | 1999-03-25 |
| CN1722584A (en) | 2006-01-18 |
| KR100469117B1 (en) | 2005-06-17 |
| CN1229915C (en) | 2005-11-30 |
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