CN100424995C - Electromagnetic interference filter - Google Patents
Electromagnetic interference filter Download PDFInfo
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- CN100424995C CN100424995C CNB031383556A CN03138355A CN100424995C CN 100424995 C CN100424995 C CN 100424995C CN B031383556 A CNB031383556 A CN B031383556A CN 03138355 A CN03138355 A CN 03138355A CN 100424995 C CN100424995 C CN 100424995C
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- electromagnetic interference
- interference filter
- metal film
- groupware
- ceramic condenser
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Abstract
The present invention discloses an electromagnetic interference filter which comprises an electric induction coil, a ceramic capacitance plate, a metal film capacitance assembly and an earth conducting wire, wherein the electric induction coil leads out four conducting wires; one first surface of the ceramic capacitance plate is provided with a plurality of metal film zones, one second surface is provided with one metal film zone, and the metal film zones of the first surface and the metal film zone of the second surface respectively form a plurality of capacitance electrodes; the metal film capacitance assembly is provided with two conducting wires; the two conducting wires of the electric induction coil are respectively and electrically connected with the capacitance electrodes; the other two conducting wires of the electric induction coil are respectively and electrically connected with the conducting wires of the metal film capacitance assembly; one end of the earth conducting wire is electrically connected to the metal film zone of the second surface.
Description
Technical field
The present invention relates to a kind of filter, particularly about a kind of Electromagnetic interference filter.
Background technology
Share in the occasion of a power supply equipment in various electronic, be present in interference problem between circuit with electromagnetic interference (Electromagnetic Interference; EMI) and noise (Noise) for the most remarkable.Power system almost is that all electric products are necessary, also becomes the main source of all electromagnetic interference.Therefore, most power supply equipment all can be installed an Electromagnetic interference filter (EMI filter) at present.
See also Figure 1A and Figure 1B, be respectively the end view and the top view of a known Electromagnetic interference filter.The capacitor 11 of this Electromagnetic interference filter 1 generally is formed by connecting by 112 of two ceramic condensers (also claiming Y electric capacity), 111 and one metallic film electric capacity (also claiming X electric capacity).Fig. 1 C shows the anabolic process of this capacitor 11.Thus, because the ceramic condenser 111 that is comprised in the capacitor 11 is the specification product with metallic film electric capacity 112.Therefore, the employed lining material 1111 and 113 that insulation effect arranged reflects burden on the cost of manufacture in ceramic condenser 111 and metallic film electric capacity 112 manufacturing process.In addition, utilize this combination can allow ceramic condenser 111 and metallic film electric capacity 112 both connect after the volume of formed capacitor 11 become big, and then allow the volume of whole Electromagnetic interference filter 1 increase.
In addition, shown in Fig. 1 D, above-mentioned capacitor 11 also can be by two metallic film electric capacity 112 ' and 112 " institute combines.Thus, its circuit can not separatedly use, and therefore known Composite capacitor of being made up of a metallic film electric capacity and a ceramic condenser 11 or the Composite capacitor of being made up of two metallic film electric capacity 11 ' can restricted existence on the circuit application of Electromagnetic interference filter 1.
Referring again to Figure 1A and 1B, capacitor 11 required electric wiring contacts have only 3, and promptly therefore a shown in the figure, b and c must carry out the reason line action of repetition for 4 leads of ceramic condenser 111, cause the burden on the manufacturing cost.Again, whole Electromagnetic interference filter 1 needs the extra non-electric function part that constitutes the electronic circuit contact in addition, and for example printed circuit board (PCB) 13, and constitute required electrode points 14a and the 14b of input/output, for example PVC line or metal terminal.Therefore, in a word, burden is too big on the cost of manufacture of known Electromagnetic interference filter, and economic benefit is too low and be not inconsistent the production demand.
Summary of the invention
Problem such as excessive for the volume that solves above-mentioned known Electromagnetic interference filter, that cost of manufacture is too high, circuit application is range limited, the present invention proposes a kind of Electromagnetic interference filter of improvement.
A purpose of the present invention is, proposes a kind of Electromagnetic interference filter, and its volume is less compared to known person, and can save the use amount of lining material.
Another object of the present invention is to, propose an Electromagnetic interference filter, it does not need extra non-electronic component to finish the circuit connection, and need not the reason line operation of complexity and repetition in manufacture process, thereby can reduce production costs.
Another purpose of the present invention is, proposes an Electromagnetic interference filter, and its metallic film electric capacity and ceramic condenser can separate to use or merge in circuit on demand to be used, and can the expanded application scope.
The present invention utilizes a ceramic condenser plate with two capacitance electrode districts to be built-up foundation, one inductance coil, a metallic film capacitance group are dressed up an Electromagnetic interference filter, wherein the inductance coil lead of being drawn itself promptly can be used as the I/O end of power supply, and under the help of an earth lead, can become a complete circuit.This Electromagnetic interference filter also can add other electronic building bricks such as resistance according to different application demands.
According to the Electromagnetic interference filter of one embodiment of this invention, comprise one and lead to the inductance coil of four leads, a metal film capacitor groupware and the earth lead that a ceramic condenser plate, has two leads.One first surface of ceramic condenser plate has a plurality of metallic films district, and a second surface has a metallic film district.The metallic film district of this first surface constitutes a plurality of capacitance electrodes with the metallic film district of this second surface respectively.One of feature of the present invention is that two leads of this inductance coil are electrically connected with such capacitance electrode respectively, two leads in addition of this inductance coil are electrically connected with such lead of this metal film capacitor groupware respectively, and an end of this earth lead is connected to the metallic film district of this second surface.In addition, this ceramic condenser plate and metal film capacitor groupware are coated by a lining material.
The invention has the advantages that: the first, metallic film electric capacity and ceramic condenser plate are finished with lining material lining in the lump, and omit the lining material of ceramic capacitor, therefore can reduce the volume of whole Electromagnetic interference filter; The second, the capacitance of the capacitance electrode of ceramic condenser plate can be adjusted by the spreading area size in the metallic film district that changes the ceramic condenser plate, and then has bigger range of application, and is not subjected to the restriction of existing fixedly specification; Three, Electromagnetic interference filter is set up a complete circuit with the lead of the inductance coil of itself as the I/O end of power supply, do not need printed circuit board (PCB) or other non-electric function part to reach the effect that circuit connects, do not need extra lead external, so can effectively reduce material cost yet; Four, metallic film electric capacity and ceramic condenser plate can separately be electrically connected, and also can be electrically connected, and therefore increase the flexibility ratio of using; Five, can increase on demand a metal-back or plastic housing increase the shield effectiveness of electromagnetic interference and Electromagnetic interference filter is provided and other electronic component between required safe distance.
Description of drawings
Figure 1A is an end view, shows the intraware of a known Electromagnetic interference filter;
Figure 1B is a top view, shows the intraware of a known Electromagnetic interference filter;
Fig. 1 C is a flow chart, shows the anabolic process of the capacitor assembly of a known Electromagnetic interference filter;
Fig. 1 D is a flow chart, shows that one is used for the manufacture process of the Composite capacitor assembly of known Electromagnetic interference filter;
Fig. 2 A is a schematic diagram, shows the embodiment according to the ceramic condenser plate that Electromagnetic interference filter of the present invention adopted;
Fig. 2 B is a schematic diagram, shows another embodiment according to the ceramic condenser plate that Electromagnetic interference filter of the present invention adopted;
Fig. 3 is a flow chart, shows a manufacture according to Electromagnetic interference filter of the present invention;
Fig. 4 A is a stereogram, shows the Electromagnetic interference filter according to first embodiment of the invention;
Fig. 4 B is a stereogram, shows the Electromagnetic interference filter according to second embodiment of the invention;
Fig. 4 C is a schematic diagram, shows the circuit diagram according to the Electromagnetic interference filter of first and second embodiment of the present invention;
Fig. 5 A is a stereogram, shows the Electromagnetic interference filter according to third embodiment of the invention;
Fig. 5 B is a stereogram, shows the Electromagnetic interference filter according to four embodiment of the invention; And
Fig. 5 C is a schematic diagram, shows the circuit diagram according to the Electromagnetic interference filter of the present invention the 3rd and the 4th embodiment.
The element numbers explanation
1 Electromagnetic interference filter
11,11 ' capacitor
111 ceramic condensers
112,112 ', 112 " metallic film electric capacity
113,1111 lining materials
13 printed circuit board (PCB)s
14a, 14b electrode points
2 ceramic condenser plates
21 surfaces
21a, 21b metallic film district
211 through holes
22 surfaces
22c metallic film district
23 end faces
231 grooves
3 ceramic condenser plates
31 surfaces
31a, 31b, 31c metallic film district
32 surfaces
311 through holes
5 inductance coils
51,52,53,54 leads
55 earth leads
6 metallic film electric capacity
61,62 end leads
7 resistance
71,72 end leads
8 insulating trips
9 lining materials
10,30 plastic housings
20 metal-backs
100,200,300,400 Electromagnetic interference filter
Embodiment
Adopt a ceramic condenser plate to be used as assembling substrates according to Electromagnetic interference filter of the present invention.One embodiment of this ceramic condenser plate please refer to Fig. 2 A, and the conductor thin film of coating the ceramic condenser plate in this example is that example describes with the metallic film.Be coated with two metallic film district 21a and 21b that separate on the surface 21 of the ceramic condenser plate 2 shown in Fig. 2 A, this metallic film for example is a silverskin.On the other hand, then be not coated with a metallic film district 22c on the surface 22 of ceramic condenser plate 2 subregion.Thus, metallic film district 21a and 21b have constituted two capacitance electrode districts with metallic film district 22c respectively.Yet, be noted that the metallic film district that is coated with on the surface 21 of ceramic condenser plate 2 might not be only limited to two, also can be more than two.In addition, two metallic film district 21a and 21b are respectively equipped with a through hole 211, then are provided with two grooves 231 on the end face 23 on the ceramic condenser plate 2.The setting of these through holes 211 and groove 231 is used for assisting the reason line in the subsequent group process of assembling to handle (seeing Fig. 3 A to 3F).
Although the ceramic condenser plate that is proposed in the present embodiment is rectangular, not as limit, the shape of ceramic condenser plate also can change to shapes such as circle, polygon, irregularly shaped, regular figure in response to needs.Shown in Fig. 2 B according to one of another example of the present invention rounded ceramic condenser plate 3.This ceramic condenser plate 3 still has two and is positioned at metallic film district 31a, 31b and the 31c that surface 31 and is positioned at surface 32, and metallic film district 31a, 31b are respectively equipped with through hole 311.In addition, under notion of the present invention, as long as utilizing a ceramic condenser plate with two or more capacitance electrodes can realize as the purpose of assembling substrates, then can and change according to the demand in the assembling with a number average, even through hole or groove also can not need be set according to the profile of the ceramic condenser plate that Electromagnetic interference filter of the present invention adopted, size and the setting of going up through hole or groove thereof.
Please refer to Fig. 3 A to Fig. 3 F, illustrate the assembling mode of an embodiment of Electromagnetic interference filter of the present invention.At first, as shown in Figure 3A, one inductance coil 5 that leads to four leads 51,52,53 and 54 is provided, then, two leads 53,54 are passed the through hole 211 of ceramic condenser plate 2 from the surface 22 of ceramic condenser plate 2 respectively and draw surface 21, and be bent into parallel with the surface 21 of ceramic condenser plate 2 in ceramic condenser plate 2.Secondly, shown in Fig. 3 B, be inverted ceramic condenser plate 2, the two ends lead 61,62 of one metallic film electric capacity 6 is electrically connected with two leads 51,52 of inductance coil 5 respectively, and metallic film electric capacity 6 placed between inductance coil 5 and the ceramic condenser plate 2, and except lead 61,62, metallic film electric capacity 6 does not contact with inductance coil 5 and ceramic condenser plate 2.One end of one earth lead 55 is electrically connected with the metallic film district 22c of ceramic condenser plate 2; On the other hand, the two ends lead 71,72 with a resistance 7 is electrically connected with two leads 51,52 of inductance coil 5 respectively.In addition, utilize an insulating trip 8 that metallic film electric capacity 6 is coated, completely cut off the part except lead 61,62 of metallic film electric capacity 6 and contacting of inductance coil 5, ceramic condenser plate 2 with further, and lead 53,54 and earth lead 55 are bent into pattern shown in Fig. 3 C.Afterwards, shown in Fig. 3 D, after ceramic condenser plate 2, inductance coil 5 and metallic film electric capacity 6 are finished electrical connection,, and expose lead 53,54,55,61,62 promptly with lining material 9 coating ceramic capacitor boards 2 and metallic film electric capacity 6.Wherein, its coating mode for example is that ceramic condenser plate 2 and metallic film electric capacity 6 are placed plastic housing 10, inserts lining material 9 again.In addition, shown in Fig. 3 E,, above-mentioned Electromagnetic interference filter 100 can be placed a metal-back 20, in order to shield electromagnetic interference in order to strengthen the anti-electromagnetic interference usefulness of Electromagnetic interference filter.In addition, shown in Fig. 3 F, aforesaid Electromagnetic interference filter 100 also can place plastic housing 30, in order to prevent distortion, to avoid short circuit and beautify outward appearance.
Please refer to Fig. 4 A, Electromagnetic interference filter 100 according to the present invention's one first embodiment includes an inductance coil 5, a ceramic condenser plate 2, a metallic film electric capacity 6, an earth lead 55, a resistance 7 and an insulating trip 8, wherein, two leads 71 and 72 of resistance 7 are electrically connected to the lead 51 and 52 of inductance coil 5 respectively, and the lead 61 and 62 of metallic film electric capacity 6 also is electrically connected to the lead 51 and 52 of inductance coil 5 respectively.Resistance 7 and insulating trip 8 are for selecting assembly for use.On the other hand, the lead 51,52,53 of inductance coil 5 and 54 and earth lead 55 all towards one with the parallel direction of the firm and hard matter of ceramic condenser.Yet in the Electromagnetic interference filter 200 according to the present invention's one second embodiment, the direction of its lead also can be shown in Fig. 4 B, towards one with the vertical direction of ceramic condenser plate 2 essence.In the case, Electromagnetic interference filter 100 and 200 circuit diagram all with, shown in Fig. 4 C, lead 51,52,53,54 and earth lead 55 just towards different, wherein CX represents metallic film electric capacity 6, CY represents two capacitance electrode 21a, the 21b of ceramic condenser plate 2, and L represents inductance coil 5.
Please refer to Fig. 5 A, Electromagnetic interference filter 300 according to the present invention 1 the 3rd embodiment also includes an inductance coil 5, a ceramic condenser plate 2, a metallic film electric capacity 6, an earth lead 55, a resistance 7 and an insulating trip 8, wherein, two leads 71 and 72 of resistance 7 are electrically connected to the lead 51 and 52 of inductance coil 5 respectively, and the lead 61 and 62 of metallic film electric capacity 6 also is electrically connected to the lead 53 and 54 of inductance coil 5 respectively.Resistance 7 and insulating trip 8 are for selecting assembly for use.On the other hand, the lead 51,52,53 of inductance coil 5 and 54 and earth lead 55 all towards a direction parallel with ceramic condenser plate 2.Yet in the Electromagnetic interference filter 400 according to the present invention 1 the 4th embodiment, the direction of its lead also can be shown in Fig. 5 B, towards a direction vertical with ceramic condenser plate 2.In the case, Electromagnetic interference filter 300 and 400 circuit diagram all with, shown in Fig. 5 C, just lead 51,52,53 and 54 and earth lead 55 towards and the bending mode different, wherein CX represents metallic film electric capacity 6, CY represents two capacitance electrode 21a, the 21b of ceramic condenser plate 2, and L represents inductance coil 5.
With regard to the Electromagnetic interference filter 100,200,300 and 400 of the present invention's first to fourth embodiment, because the coating of the lining material 9 (seeing Fig. 3 D) of ceramic condenser plate 2 and metallic film electric capacity 6 need only once be finished, shown in Fig. 3 D, and do not need respectively ceramic condenser plate 2 and metallic film electric capacity 6 to be carried out the coating of lining material.Therefore, the material cost of lining material can be saved in a large number, and the volume of whole Electromagnetic interference filter 100～400 can be reduced.In addition, because the capacitance of two capacitance electrodes of ceramic condenser plate 2 can be adjusted by the spreading area size of metallic film district 21a, 21b and 22c, therefore, capacitance CY can not be subjected to the restriction of existing specification, and bigger range of application can be arranged.Moreover, the lead 51,52,53 of whole Electromagnetic interference filter 100～400 itself and 54 and earth lead 55 fully construction go out a complete circuit, and do not need other non-electric function part, so can reduce material cost and manufacturing cost.Again, metallic film electric capacity 6 and ceramic condenser substrate 2 can separately be electrically connected or be electrically connected, and therefore can increase the flexibility ratio of application.
On the other hand, more can put in the metal-back according to Electromagnetic interference filter 100～400 of the present invention for the purpose of the shielding of strengthening electromagnetic interference, the metal-back shown in Fig. 3 E 20 for example, perhaps for attractive in appearance and avoid the purpose of short circuit to put in the plastic housing, the plastic housing 30 shown in the plastic housing shown in Fig. 3 D 10 and Fig. 3 F for example.
In sum, the present invention is encyclopaedized by above-mentioned embodiment and variation example.Yet, those skilled in the art should be appreciated that, all embodiment of the present invention only is exemplary but not for restrictive at this, promptly, do not breaking away within connotation of the present invention and the scope, other variation example of the above-mentioned Electromagnetic interference filter of addressing and correction example are the present invention and contain.Therefore, scope of the present invention is defined by claims.
Claims (9)
1. Electromagnetic interference filter, it comprises:
One inductance coil leads to four leads;
One ceramic condenser plate, one first surface have a plurality of conductor thin films district and a second surface has a conductor thin film district, and the conductor thin film district of this first surface constitutes a plurality of capacitance electrodes with the conductor thin film district of this second surface respectively;
One metal film capacitor groupware, it has two leads; And
One earth lead;
Wherein, described inductance coil is electrically connected with the described lead of described capacitance electrode and described metal film capacitor groupware respectively with two leads, or be electrically connected with described capacitance electrode respectively and be electrically connected with the described lead of described metal film capacitor groupware respectively with other two leads, an end of described earth lead is electrically connected to the conductor thin film district of described second surface; Described ceramic condenser plate and described metal film capacitor groupware are coated by a lining material.
2. Electromagnetic interference filter as claimed in claim 1, wherein the conductor thin film district is a metallic film.
3. Electromagnetic interference filter as claimed in claim 1, wherein said metal film capacitor groupware are positioned at the described second surface top of described ceramic condenser plate and do not contact with described second surface.
4. Electromagnetic interference filter as claimed in claim 1, wherein said metal film capacitor groupware does not contact with described second surface.
5. Electromagnetic interference filter as claimed in claim 1 also comprises an insulating trip, and it coats described metal film capacitor groupware and part outside the lead of described metal film capacitor groupware and described inductance coil are completely cut off.
6. Electromagnetic interference filter as claimed in claim 1, wherein said ceramic condenser plate and described metal film capacitor groupware are coated by described lining material after described ceramic condenser plate, described metal film capacitor groupware and described inductance coil are finished electrical connection.
7. Electromagnetic interference filter as claimed in claim 1 also comprises a metal-back, and ccontaining described first plastic housing is in order to shield electromagnetic interference; And one second plastic housing, ccontaining described metal-back.
8. Electromagnetic interference filter as claimed in claim 1 also comprises a resistance, and its two lead is electrically connected with two leads that are electrically connected with described lead described metal film capacitor groupware described inductance coil respectively.
9. Electromagnetic interference filter as claimed in claim 1, the shape of described ceramic condenser plate are selected from a kind of in rectangle, circle, polygon, irregularly shaped, the group that regular figure is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031383556A CN100424995C (en) | 2003-05-27 | 2003-05-27 | Electromagnetic interference filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031383556A CN100424995C (en) | 2003-05-27 | 2003-05-27 | Electromagnetic interference filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1553568A CN1553568A (en) | 2004-12-08 |
| CN100424995C true CN100424995C (en) | 2008-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031383556A Expired - Fee Related CN100424995C (en) | 2003-05-27 | 2003-05-27 | Electromagnetic interference filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100424995C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426667C (en) * | 2005-09-21 | 2008-10-15 | 东南大学 | Electromagnetic interference eliminator for power system automation apparatus |
| CN102360727B (en) * | 2011-11-10 | 2013-03-13 | 唐山尚新融大电子产品有限公司 | Plane magnetic integrated electro magnetic interference (EMI) filter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5313176A (en) * | 1992-10-30 | 1994-05-17 | Motorola Lighting, Inc. | Integrated common mode and differential mode inductor device |
| CN2561159Y (en) * | 2001-08-09 | 2003-07-16 | 神达电脑股份有限公司 | Electromagnetic interference wave filter for power source supplier |
-
2003
- 2003-05-27 CN CNB031383556A patent/CN100424995C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5313176A (en) * | 1992-10-30 | 1994-05-17 | Motorola Lighting, Inc. | Integrated common mode and differential mode inductor device |
| CN2561159Y (en) * | 2001-08-09 | 2003-07-16 | 神达电脑股份有限公司 | Electromagnetic interference wave filter for power source supplier |
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| Publication number | Publication date |
|---|---|
| CN1553568A (en) | 2004-12-08 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Delta Electronics (Dongguan) Inc. Assignor: Delta Optoelectronics Inc. Contract fulfillment period: 2005.1.1 to 2011.3.31 contract change Contract record no.: 2009990000775 Denomination of invention: Method for inhibiting electromagnetic interference and electromagnetic interference filter Granted publication date: 20081008 License type: Exclusive license Record date: 2009.7.22 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2005.1.1 TO 2011.3.31; CHANGE OF CONTRACT Name of requester: TAIDA ELECTRONICS( DONGGUAN ) CO., LTD. Effective date: 20090722 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081008 Termination date: 20150527 |
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| EXPY | Termination of patent right or utility model |