CN202996476U - Stacked staggered winding based planar EMI (electro-magnetic interference) filter - Google Patents
Stacked staggered winding based planar EMI (electro-magnetic interference) filter Download PDFInfo
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- CN202996476U CN202996476U CN 201220719576 CN201220719576U CN202996476U CN 202996476 U CN202996476 U CN 202996476U CN 201220719576 CN201220719576 CN 201220719576 CN 201220719576 U CN201220719576 U CN 201220719576U CN 202996476 U CN202996476 U CN 202996476U
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Abstract
The utility model discloses a stacked staggered winding based planar EMI (electro-magnetic interference) filter which comprises a closed magnetic circuit composed of an E-type core and an I-type core, a rectangular FR4 substrate is wound on a central core of the closed magnetic circuit, a first inductive coil, a second inductive coil and a first stratum coil are wound on the FR4 substrate, a second stratum coil, a third inductive coil and a fourth inductive coil are wound below and above the FR4 substrate, the first inductive coil and the third inductive coil as well as the second inductive coil and the fourth inductive coil are in cascade connection. In the distributed power source system, transmission noise of frequency ranging from 150 kHz to 30 MHz can be effectively suppressed, and the power source is stable.
Description
Technical field
The utility model relates to a kind of filter, particularly a kind of planar EMI filter based on overlapping staggered winding.
Background technology
In the many decades in past, at semiconductor device, the circuit topological structure that constantly improves, under the promotion of higher switching frequency and advanced person's encapsulation and integration technology, power electronic system firmly improves electrical property and hot property towards integrated, modularization, standardization and complanation direction, reduces size, thickness and loss.Although size, thickness and loss that higher switching frequency to a certain extent can less transducer, this can bring the problem of more electromagnetic interference aspect.Advanced encapsulation and integration technology can be in less space integrated more components and parts, yet need to consider more electromagnetic interference problem equally in the process of design.Operating frequency range at power electronic equipment, wherein electromagnetic interference is take conducted interference as main, its frequency range is generally 150kHz ~ 30MHz, and the form with voltage, electric current differential mode and common mode shows, according to the characteristic of electromagnetic interference, application of grounding, shielding, three kinds of methods of filtering suppress electromagnetic interference signal usually.Electromagnetic interface filter is very effective means suppressing aspect conducted interference, therefore, comes the jamproof ability of raising equipment with electromagnetic interface filter in power inverter.
The electromagnetic compatibility components and parts and between interconnected size and the profile that is often determining whole system.When using the discrete passive component, because the profile of each element all is not quite similar, thereby the space can not be used fully.Yet, for most applications, owing to still having used some discrete passive components and have structural family planning parameter in electromagnetic interface filter, as the equivalent series inductance (ESL) of electric capacity and the equivalent parallel electric capacity (EPC) of inductance, make the high frequency performance of filter unsatisfactory.
The utility model content
The shortcoming and deficiency that exist in order to overcome prior art, the utility model provides a kind of planar EMI filter based on overlapping staggered winding, its in distributed power supply system effectively blanketing frequency at the conducted noise of 150kHz-30MHz, thereby make the stable of power-supply system.
The utility model adopts following technical scheme:
A kind of planar EMI filter based on overlapping staggered winding, comprise the closed magnetic circuit that is consisted of by E type magnetic core 9 and Ι type magnetic core 8, be wound with the FR4 substrate 7 of rectangle on the center magnetic core of closed magnetic circuit, above the FR4 substrate, from top to bottom successively around the first inductance coil 1, the second inductance coil 2, the first stratum coil 3, be provided with the first high dielectric constant ceramic dielectric between described the first inductance coil 1 and the second inductance coil 2, be provided with the second high dielectric constant ceramic dielectric between the second inductance coil 2 and the first stratum coil 3;
Below FR4 substrate 7, be wound with the second stratum coil 4, the 3rd inductance coil 5, the 4th inductance coil 6 with symmetry above the FR4 substrate, be provided with the first high dielectric constant ceramic dielectric between the second high dielectric constant ceramic dielectric, the 3rd inductance coil 5 and the 4th inductance coil 6 between described the second stratum coil 4 and the 3rd inductance coil 5;
Described the first inductance coil 1 and the 3rd inductance coil 5 cascades, described the second inductance coil 2 and the 4th inductance coil 6 cascades.
Also comprise the 3rd stratum coil 10 and the 4th stratum coil 13, described the 3rd stratum coil 13 is positioned at the first inductance coil 1 top, and and be provided with the second high dielectric constant ceramic dielectric between the first inductance coil 1, described the 4th stratum coil 13 is positioned at the 4th inductance coil 6 belows, and and the 4th inductance coil 6 between be provided with the second high dielectric constant ceramic dielectric.
Described the first inductance coil 1 and the 3rd inductance coil 5 cascades consist of the first common mode inductance, described the second inductance coil 2 and the 4th inductance coil 6 cascades consist of the second common mode inductances, and a kind of so staggered cascade structure can reduce self parasitic capacitance of common mode inductance greatly.
The first high dielectric constant ceramic dielectric between described the first inductance coil 1 and the second inductance coil 2 consists of the first differential mode capacitor, the first high dielectric constant ceramic dielectric between described the 3rd inductance coil 5 and the 4th inductance coil 6 consists of the second differential mode capacitor, thereby need not to add the differential mode capacitor element, realized the miniaturization of filter.
The second high dielectric constant ceramic dielectric between described the first stratum coil 3 and the second inductance coil 2 consists of the first common mode capacitance, and the second high dielectric constant ceramic dielectric between the second stratum coil 4 and the 3rd inductance coil 5 consists of the second common mode capacitance.
Be provided with the second high dielectric constant ceramic dielectric between described the 3rd stratum coil 10 and the first inductance coil 1 and consist of the 3rd common mode capacitance, be provided with the second high dielectric constant ceramic dielectric between described the 4th stratum coil 13 and the 4th inductance coil 6 and consist of the 4th common mode capacitance.
The relative dielectric constant of described the first high dielectric constant ceramic dielectric is 14000, and the relative dielectric constant of the second high dielectric constant ceramic dielectric is 78.
The beneficial effects of the utility model:
(1) utilize dexterously the coupling between overlapping staggered common mode inductance to realize differential mode capacitor, and do not need to increase in addition to realize the components and parts of differential mode capacitor, thereby reduced the volume of filter;
(2) employing realizes common mode choke with overlapping cross structure winding, and it can effectively reduce the equivalent parallel inductance of inductance self, thereby can improve the high frequency performance of filter;
(3) consist of the two-stage on line circle of common mode inductance respectively at the common mode capacitance of coupling formation electric capacity in stratum as common-mode filter, do not needing to increase considerably under the components and parts condition of filter, realized that its equivalent electric circuit is the low pass filter of two-stage, thereby further improved the high frequency performance of planar EMI filter.
Description of drawings
Fig. 1 is based on the planar EMI filter structural representation of overlapping staggered winding;
Fig. 2 is the planar EMI filter structural representation of embodiment 2;
Fig. 3 is the longitdinal cross-section diagram of Fig. 1;
Fig. 4 is the longitdinal cross-section diagram of Fig. 2;
Fig. 5 is the equivalent electric circuit of Fig. 1;
Fig. 6 is the equivalent electric circuit of Fig. 2.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment
As Fig. 1, shown in Figure 3, a kind of planar EMI filter based on overlapping staggered winding, comprise the closed magnetic circuit that is consisted of by E type magnetic core 9 and Ι type magnetic core 8, be wound with the FR4 substrate 7 of rectangle on the center magnetic core of closed magnetic circuit, above the FR4 substrate, from top to bottom successively around the first inductance coil 1, the second inductance coil 2, the first stratum coil 3, between described the first inductance coil 1 and the second inductance coil 2, be respectively equipped with the first high dielectric constant ceramic dielectric and the second high dielectric constant ceramic dielectric between the second inductance coil 2 and the first stratum coil 3;
Below the FR4 substrate, be wound with the second stratum coil 4, the 3rd inductance coil 5, the 4th inductance coil 6 with symmetry above the FR4 substrate, between described the second stratum coil 4 and the 3rd inductance coil 5, be respectively equipped with the second high dielectric constant ceramic dielectric and the first high dielectric constant ceramic dielectric between the 3rd inductance coil 5 and the 4th inductance coil 6, and structurally, the first inductance coil 1 and the 3rd inductance coil 5 cascades, the second inductance coil 2 and the 4th inductance coil 6 cascades.
Fig. 5 is the equivalent electric circuit of Fig. 1, a, b end connects the phase line of power supply, c, d end connects the center line of power supply, and the first common mode inductance 27 is made of the second inductance coil 2 and the 4th inductance coil 6 cascades, and the second common mode inductance 28 is made of the first inductance coil 1 and the 3rd inductance coil 5 cascades;
The first differential mode capacitor 31 is formed by the first high dielectric constant ceramic dielectric between the first inductance coil 1 and the second inductance coil 2, and the second differential mode capacitor 32 is formed by the first high dielectric constant ceramic dielectric between the 3rd inductance coil 5 and the 4th inductance coil 6.
The first common mode capacitance 33 in Fig. 5 is formed by the second high dielectric constant ceramic dielectric between the first stratum coil 3 and the second inductance coil 2; The second common mode capacitance 34 is formed by the second high dielectric constant ceramic dielectric between the second stratum coil 4 and the 3rd inductance coil 5.
In Fig. 5,29 and 30 are respectively the first stratum coil inductance and the second stratum coil inductance.
Embodiment 2
as Fig. 2 and shown in Figure 4, a kind of based on overlapping staggered winding planar EMI filter, comprise the closed magnetic circuit that is consisted of by E type magnetic core 9 and Ι type magnetic core 8, be wound with the FR4 substrate 7 of rectangle on the center magnetic core of closed magnetic circuit, above the FR4 substrate, from top to bottom successively around the 3rd stratum coil 10, the first inductance coil 1, the second inductance coil 2, the first stratum coil 3, be provided with the first high dielectric constant ceramic dielectric between described the first inductance coil 1 and the second inductance coil 2, be provided with the second high dielectric constant ceramic dielectric between the first inductance coil 1 and the 3rd stratum coil 10, be provided with the second high dielectric constant ceramic dielectric between the second inductance coil 2 and the first stratum coil 3.
below the FR4 substrate, be wound with the second stratum coil 4 with symmetry above the FR4 substrate, the 3rd inductance coil 5, the 4th inductance coil 6, the 4th stratum coil 13, be provided with the second high dielectric constant ceramic dielectric between described the 3rd stratum coil 12 and the 3rd inductance coil 5, the first high dielectric constant ceramic dielectric between the 3rd inductance coil 5 and the 4th inductance coil 6, be provided with the second high dielectric constant ceramic dielectric between the 4th inductance coil 6 and the 4th stratum coil 13, and structurally, the first inductance coil and the 3rd inductance coil cascade, the second inductance coil and the 4th inductance coil 6 cascades.
The first stratum coil 3 in described Fig. 4 and the coil number of the 3rd stratum coil 10 are half of the first stratum coil number in embodiment 1.
The second stratum coil 4 in described Fig. 4 and the coil number of the 4th stratum coil 13 are half of the second stratum coil number in embodiment 1.
Fig. 6 is the equivalent electric circuit of Fig. 2, e, f end connects the phase line of power supply, g, h end connects the center line of power supply, the 3rd common mode inductance 35 is formed by the second inductance coil 2, the 4th common mode inductance 36 is formed by the 4th inductance coil 6, and its inductance value is half of the first common mode inductance in embodiment 1, and the 5th common mode inductance 37 is formed by the first inductance coil 1, the 6th common mode inductance 38 is formed by the 3rd inductance coil 5, and its inductance value is half of the second common mode inductance in embodiment 1;
The first differential mode capacitor 43 is formed by the first high dielectric constant ceramic dielectric between the first inductance coil 1 and the second inductance coil 2, and the second differential mode capacitor 44 is formed by the first high dielectric constant ceramic dielectric between the 3rd inductance coil 5 and the 4th inductance coil 6.
The first common mode capacitance 45 in Fig. 6 is formed by the second high dielectric constant ceramic dielectric between the first stratum coil 3 and the second inductance coil 2;
The second common mode capacitance 48 is formed by the second high dielectric constant ceramic dielectric between the second stratum coil 4 and the 3rd inductance coil 5;
The 3rd common mode capacitance 46 is formed by the second high dielectric constant ceramic dielectric between the 4th stratum coil 13 and the 4th inductance coil 6;
The 4th common mode capacitance 47 is formed by the second high dielectric constant ceramic dielectric between the 3rd stratum coil 10 and the first inductance coil 1;
Its common mode equivalent circuit is the two-stage low pass filter.
In Fig. 6,39,40,41 and 42 are respectively the first stratum coil inductance, the second stratum coil inductance, the 3rd stratum coil inductance and the 4th stratum coil inductance.
The utility model adopts the LC winding to realize consisting of the components and parts of planar EMI filter, and its differential mode inductance is realized by the leakage inductance of common mode inductance; Adopt overlapping staggered winding construction to reduce the equivalent parallel electric capacity of inductance; Adopt the coupling of common mode winding and multilayer ground structure to realize the two poles of the earth filter effect of filter, thereby realize the miniaturization of planar EMI filter and good high frequency performance thereof.
Above-described embodiment is the better execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, within being included in protection range of the present utility model.
Claims (7)
1. planar EMI filter based on overlapping staggered winding, it is characterized in that, comprise the closed magnetic circuit that is consisted of by E type magnetic core (9) and Ι type magnetic core (8), be wound with the FR4 substrate (7) of rectangle on the center magnetic core of closed magnetic circuit, in FR4 substrate (7) top, from top to bottom successively around the first inductance coil (1), the second inductance coil (2), the first stratum coil (3), be provided with the first high dielectric constant ceramic dielectric between described the first inductance coil (1) and the second inductance coil (2), be provided with the second high dielectric constant ceramic dielectric between the second inductance coil (2) and the first stratum coil (3),
In FR4 substrate (7) below, be wound with the second stratum coil (4), the 3rd inductance coil (5), the 4th inductance coil (6) with symmetry above the FR4 substrate, be provided with between the second high dielectric constant ceramic dielectric, the 3rd inductance coil (5) and the 4th inductance coil (6) between described the second stratum coil (4) and the 3rd inductance coil (5) and be provided with the first high dielectric constant ceramic dielectric;
Described the first inductance coil (1) and the 3rd inductance coil (5) cascade, described the second inductance coil (2) and the 4th inductance coil (6) cascade.
2. a kind of planar EMI filter based on overlapping staggered winding according to claim 1, it is characterized in that, also comprise the 3rd stratum coil (10) and the 4th stratum coil (13), described the 3rd stratum coil (10) is positioned at above the first inductance coil (1), and and be provided with the second high dielectric constant ceramic dielectric between the first inductance coil (1), described the 4th stratum coil (13) is positioned at the 4th inductance coil (6) below, and and the 4th inductance coil (6) between be provided with the second high dielectric constant ceramic dielectric.
3. a kind of planar EMI filter based on overlapping staggered winding according to claim 1, it is characterized in that, described the first inductance coil (1) consists of the first common mode inductance with the 3rd inductance coil (5) cascade, and described the second inductance coil (2) consists of the second common mode inductance with the 4th inductance coil (6) cascade.
4. a kind of planar EMI filter based on overlapping staggered winding according to claim 1, it is characterized in that, the first high dielectric constant ceramic dielectric between described the first inductance coil (1) and the second inductance coil (2) consists of the first differential mode capacitor, and the first high dielectric constant ceramic dielectric between described the 3rd inductance coil (5) and the 4th inductance coil (6) consists of the second differential mode capacitor.
5. a kind of planar EMI filter based on overlapping staggered winding according to claim 1, it is characterized in that, the second high dielectric constant ceramic dielectric between described the first stratum coil (3) and the second inductance coil (2) consists of the first common mode capacitance, and the second high dielectric constant ceramic dielectric between the second stratum coil (4) and the 3rd inductance coil (5) consists of the second common mode capacitance.
6. a kind of planar EMI filter based on overlapping staggered winding according to claim 2, it is characterized in that, be provided with the second high dielectric constant ceramic dielectric between described the 3rd stratum coil (10) and the first inductance coil (1) and consist of the 3rd common mode capacitance, be provided with the second high dielectric constant ceramic dielectric between described the 4th stratum coil (13) and the 4th inductance coil (6) and consist of the 4th common mode capacitance.
7. the described a kind of planar EMI filter based on overlapping staggered winding of according to claim 1-6 any one, it is characterized in that, the relative dielectric constant of described the first high dielectric constant ceramic dielectric is 14000, and the relative dielectric constant of the second high dielectric constant ceramic dielectric is 78.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719576 CN202996476U (en) | 2012-12-15 | 2012-12-15 | Stacked staggered winding based planar EMI (electro-magnetic interference) filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220719576 CN202996476U (en) | 2012-12-15 | 2012-12-15 | Stacked staggered winding based planar EMI (electro-magnetic interference) filter |
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| CN202996476U true CN202996476U (en) | 2013-06-12 |
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| CN 201220719576 Expired - Fee Related CN202996476U (en) | 2012-12-15 | 2012-12-15 | Stacked staggered winding based planar EMI (electro-magnetic interference) filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065765A (en) * | 2012-12-15 | 2013-04-24 | 华南理工大学 | Planer Electro Magnetic Interference (EMI) filter based on overlapped interleaved windings |
| CN107546002A (en) * | 2017-07-29 | 2018-01-05 | 友邦电气（平湖）股份有限公司 | A kind of automobile charging pile unframed transformer |
| CN107610902A (en) * | 2017-09-15 | 2018-01-19 | 深圳市英威腾电气股份有限公司 | A kind of magnetic cell and DC DC converters |
-
2012
- 2012-12-15 CN CN 201220719576 patent/CN202996476U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065765A (en) * | 2012-12-15 | 2013-04-24 | 华南理工大学 | Planer Electro Magnetic Interference (EMI) filter based on overlapped interleaved windings |
| CN107546002A (en) * | 2017-07-29 | 2018-01-05 | 友邦电气（平湖）股份有限公司 | A kind of automobile charging pile unframed transformer |
| CN107610902A (en) * | 2017-09-15 | 2018-01-19 | 深圳市英威腾电气股份有限公司 | A kind of magnetic cell and DC DC converters |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20151215 |
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| EXPY | Termination of patent right or utility model |