CN103780216B - The whole plane electromagnetic interface filter integrated morphology that a kind of circular flat PCB coupling inductance is constituted - Google Patents

Abstract

The present invention provides the whole plane electromagnetic interface filter integrated morphology that a kind of circular flat PCB coupling inductance is constituted, the common mode inductance that each acts as including circular flat PCB coupling inductance and leakage inductance thereof, differential mode inductance, differential mode capacitor I and differential mode capacitor II, common mode integrated lc unit I and common mode integrated lc unit II, one port of differential mode capacitor I is as the input of wave filter, and a port of differential mode capacitor II is as the outfan of wave filter.The present invention uses circular flat PCB coupling inductance as the basic component units of planar EMI filter, this new construction coupling inductance is with pcb board as substrate, being embedded on substrate by round ceramic planar magnetic core, PCB printed circuit cable serves as the former vice-side winding of magnetic core, is wound on magnetic core by metallic vias.New construction coupling inductance eliminates the kettle shape magnetic core that volume in wave filter is relatively big and closes, it is achieved the decoupling of each comprising modules of wave filter, is beneficial to dispel the heat and effectively reduce the volume and weight of planar EMI filter, and the connection between each module of wave filter also becomes simpler.

Description

The whole plane electromagnetic interface filter integrated morphology that a kind of circular flat PCB coupling inductance is constituted

Technical field:

The present invention relates to the whole plane magnetic integrated morphology of a kind of electromagnetic interface filter, particularly relate to a kind of circular flat PCB The planar EMI filter integrated morphology that coupling inductance is constituted.

Background technology:

Along with the continuous progress of science and technology, electronic devices and components are constantly to miniaturization, integrated development, and this makes power electronics become The composition of changing device becomes dexterous.But owing to more components and parts concentrate in a little space, distribution density is too high, produce Give birth to and be greatly increased by the probability of electromagnetic interference.Meanwhile, it is operated in the power electronic devices under on off state, du/dt, Di/dt is relatively big, and its surge current produced and peak voltage become interference source so that containing abundant in switching voltage, electric current Higher hamonic wave.For ensureing the safe and reliable operation of converting means, electromagnetic interference has become in its design process has to examine The problem considered.

Electromagnetic interference in field of power electronics is divided into radiation interference and Conduction Interference, and electromagnetic interface filter is that suppression conduction is dry The effective tool disturbed.Electromagnetic interface filter typically uses discrete passive element inductance and electric capacity to constitute, feature be quantity many, Volume is big, which prevent Technics of Power Electronic Conversion device to miniaturization, the trend of integrated development.American Electric Power electronics is studied Center (Collaborative Psychiatric Epidemiology Surveys, CPES) proposes to be applied to integrated magnetic Electromagnetic interface filter, while realizing modularity and miniaturization, more efficient has blocked EMI coupling path, becomes and sends out One of important directions of exhibition novel EMI wave filter, this filter design method is not changing traditional E MI filtering topology On the basis of, by direct copper on high-dielectric-constant ceramics plate, constitute LC integrated unit, then be utilized respectively different knot The LC integrated unit of structure constitutes difference common mode filtering module, and then forms complete planar EMI filter.

Planar EMI filter (as shown in Figure 1) the most most generation being applied to switch power supply system of CPES design Table: utilize single turn lc unit to constitute differential mode capacitor 101, in the both sides spraying plating multiturn rectangular coil of ceramic dielectric substrate Coil, as common mode integrated LC structure 102, forms complete planar EMI with leakage inductance layer 103 and EI type magnetic core 104 Wave filter.This construction reduces volume, substantially increase power density, reduce the parasitic parameter of high frequency simultaneously, but adopt Rectangle plane spiral winding cause conductor utilization low, inductance value is less, and electric current makes at right angle skewness The performance of wave filter is had a greatly reduced quality, and ceramic substrate is brittle in addition, connects to installation and brings the biggest challenge.

Nanjing Aero-Space University proposes the planar EMI filter integrated morphology of a kind of circular PCB wire turn composition (such as Fig. 2 Shown in), this structure includes plane kettle type magnetic core 201, differential mode capacitor I202, common mode inductance layer I203, common mode inductance layer II204, common mode integrated LC structure I 205, leakage inductance layer 206, common mode integrated LC structure I I207, common mode inductance layer III208, Common mode inductance layer IV209 and differential mode capacitor II210.Substituting EI type magnetic core with kettle type magnetic core, spiral winding is integrally incorporated in Inside magnetic core, conductor utilization is improved, the existence of common mode inductance layer so that inductance value is increased, Planar integration LC structure uses circular planar spiral winding, square spiral coil corner CURRENT DISTRIBUTION inequality band when eliminating high frequency The impact come, improves the insertion loss of wave filter, improves the high frequency performance of wave filter, but the use of kettle type magnetic core, The volume making wave filter increases, and does not meets the development trend of wave filter miniaturization, and modules is enclosed in magnetic core, Connect to the installation of each module and bring difficulty, be unfavorable for heat radiation simultaneously, have influence on reliability during wave filter work.

Summary of the invention:

Present invention aim at for planar EMI filter prior art defect, propose a kind of by circular flat PCB coupling Close the whole plane electromagnetic interface filter integrated morphology that inductance, the integrated lc unit of common mode and differential mode capacitor are constituted.

The present invention adopts the following technical scheme that the whole plane electromagnetic interface filter that a kind of circular flat PCB coupling inductance is constituted Integrated morphology, it includes common mode inductance, the differential mode inductance that circular flat PCB coupling inductance and leakage inductance thereof each act as, Differential mode integrated capacitance I and differential mode integrated capacitance II, common mode integrated lc unit I and common mode integrated lc unit II, described circle Shape plane PCB coupling inductance includes PCB substrate, be embedded in PCB substrate round ceramic planar magnetic core and PCB Printed circuit cable, wherein PCB printed circuit cable includes two, and two ends of a described wherein PCB printed circuit cable are respectively For E, F end, two ends of another root PCB printed circuit cable are respectively G, H end, and described E, F end place PCB prints Brush wire and G, H end place PCB printed circuit cable are respectively as the former and deputy limit winding of round ceramic planar magnetic core, logical The metallic vias crossing PCB substrate is wound on magnetic core, described differential mode integrated capacitance I and the structure phase of differential mode integrated capacitance II With, it includes the medium substrate as differential mode capacitor, is plated in full symmetric single turn spiral in the upper and lower plane of medium substrate Coil I and single turn spiral winding II, the end points of single turn spiral winding I and single turn spiral winding II is according to breach side clockwise To numbered M, P, N, Q, the M of described differential mode integrated capacitance I₁And N₁The input as wave filter is drawn by wire End, the P of described differential mode integrated capacitance II₂And Q₂Outfan as wave filter.

The P of described differential mode integrated capacitance I₁And Q₁Connect E end and the G end of circular flat PCB coupling inductance respectively.

The structure of described common mode integrated lc unit I lc unit integrated with common mode II is identical, and it includes as common mode integrated The medium substrate of lc unit, on the upper strata of medium substrate, lay multiple radius increase successively, end to end semicircle Planar spiral winding, outermost layer and the innermost layer end points of described semicircular planform spiral winding are designated as A and B, medium respectively Ground connection after the whole copper-clad of lower floor of substrate, described ground plane end points is designated as C, D, described common mode integrated lc unit II A₂And B₂Respectively with H end and the N of differential mode integrated capacitance II of circular flat PCB coupling inductance₂It is connected, described difference The M of mould integrated capacitance II₂The B of lc unit I integrated with common mode₁It is connected, the A of described common mode integrated lc unit I₁With The F end of circular flat PCB coupling inductance is connected.

There is advantages that

(1). the present invention compared with prior art, uses circular flat PCB coupling inductance as the base of electromagnetic interface filter This component units, eliminates the bigger EI type magnetic core of volume or kettle type magnetic core, it is achieved that the whole plane of wave filter, with Time differential mode integrated capacitance be with the two-sided PCB of high-k as substrate, be plated in full symmetric single turn spiral shell in upper plane Spin line circle I and single turn spiral winding II, to increase differential mode capacitor value, the integrated lc unit of common mode, at two-sided PCB Upper strata, lay multiple radius increase successively, end to end semicircular planform spiral winding, copper all applies in the lower floor of PCB Ground connection；

(2). wave filter is under the conditions of realizing equal performance, and volume is reduced, and power density is improved, and meets little Type, integrated development trend；

(3). present invention can apply in the Front End Converter of distributed power supply system, be particularly well-suited to the area of plane is wanted Seek harsh occasion；

(4). because having broken the closure of magnetic core, the connection of each module of wave filter becomes easy, and heat dispersion also becomes Well, this makes wave filter reliability be improved；

(5). compared with the electromagnetic interface filter of discrete component composition, volume is obviously reduced, and improves inserting of wave filter Enter loss, improve the high frequency performance of wave filter.

Accompanying drawing illustrates:

Fig. 1 is integrated EMI filter based on rectangle plane integrated LC structure.

Fig. 2 is integrated EMI filter based on circular flat integrated LC structure.

Fig. 3 A is the integrated lc unit of common mode.

Fig. 3 B is the equivalent lumped-parameter circuit of the integrated lc unit of common mode.

Fig. 4 A is circular flat PCB coupling inductance.

Fig. 4 B is the equivalent lumped-parameter circuit of circular flat PCB coupling inductance.

Fig. 5 A is differential mode integrated capacitance.

Fig. 5 B is the equivalent lumped-parameter circuit of differential mode integrated capacitance.

Fig. 6 A is the whole plane electromagnetic interface filter integrated based on circular flat PCB coupling inductance.

Fig. 6 B is the equivalent lumped-parameter circuit of whole plane integrated EMI filter.

Detailed description of the invention:

Below in conjunction with the accompanying drawings technical scheme is described in detail:

As shown in Figure 6A, the invention provides the whole plane EMI filter that a kind of circular flat PCB coupling inductance is integrated Ripple device.This structure includes common mode inductance, the differential mode electricity that circular flat PCB coupling inductance 601 and leakage inductance thereof each act as Sense, differential mode integrated capacitance I 602 and differential mode integrated capacitance II610, common mode integrated lc unit I 605 and the integrated LC of common mode Unit II607.Wherein circular flat PCB coupling inductance 601 (as shown in Figure 4 A) include PCB substrate (material is FR-4), Round ceramic planar magnetic core 401 and PCB printed circuit cable 402, wherein the PCB printed circuit cable being embedded in PCB substrate 402 include two, and two ends of a described wherein PCB printed circuit cable 402 are respectively E, F end, another root PCB Two ends of printed circuit cable 402 are respectively G, H end, described E, F end place PCB printed circuit cable and G, H end institute At PCB printed circuit cable respectively as the former and deputy limit winding of round ceramic planar magnetic core, by the metal mistake of PCB substrate Hole is wound on magnetic core.Differential mode integrated capacitance I 602 is identical with the structure of differential mode integrated capacitance II610 (as shown in Figure 5A), Its use high dielectric constant ceramic material (material is Y5V) as the medium substrate 502 of differential mode capacitor, at medium substrate 502 Upper and lower plane is plated in full symmetric single turn spiral winding I501 and single turn spiral winding II503, single turn spiral winding I501 With the end points of single turn spiral winding II503 according to breach numbered M, P, N, Q clockwise, wherein differential mode is integrated The M of electric capacity I602₁And N₁The input as wave filter, its P is drawn by wire₁And Q₁Meet circular flat PCB respectively The E end of coupling inductance 601 (as shown in Figure 4 A) and G end.Common mode integrated lc unit I 605 and the integrated LC of common mode is mono- The structure of unit II607 is identical, and it uses ceramic material (material is NPO) as the medium substrate of the integrated lc unit of common mode 302, on the upper strata of medium substrate 302, lay multiple radius increase successively, end to end semicircular planform helix Circle 301, the outermost layer of semicircular planform spiral winding 301 and innermost layer end points are designated as A and B, medium substrate 302 respectively The whole copper-clad of lower floor 303 after ground connection, ground plane end points is designated as C (D), wherein common mode integrated lc unit II607 A₂And B₂Respectively with the H and differential mode integrated capacitance II 610 (as shown in Figure 5A) of circular flat PCB coupling inductance 601 N₂It is connected.The M of differential mode integrated capacitance II610 (as shown in Figure 5A)₂Lc unit I605 integrated with common mode is (such as Fig. 3 A Shown in) B₁It is connected, the A of common mode integrated lc unit I605 (as shown in Figure 3A)₁Finally couple with circular flat PCB The F of inductance 601 is connected.The P of differential mode integrated capacitance II610₂And Q₂Output port as wave filter.

Fig. 3 B is the equivalent parameters circuit of Fig. 3 A, and the number of turn of common mode integrated lc unit upper coil is N₁, helix Circle width is w₁, PCB substrate thickness is d₁；Collected by PCB substrate and printed circuit cable thereof and round ceramic planar magnetic core The circular flat PCB coupling inductance become is shown in Fig. 4 A, and its former secondary number of turn is N₂, conductor width is w₂, winding wire Turn-to-turn is divided into h, and PCB substrate thickness is d₂, the magnetic circuit area of magnetic core is A_e, the length of magnetic path is l_e, pcrmeability is μ_r, Fig. 4 B is its equivalent parameters circuit；As shown in Figure 5A, its number of turn is 1 to differential mode integrated capacitance, and spiral winding width is w₃, PCB substrate thickness is d₃, equivalent parameters circuit is shown in Fig. 5 B.

Vice-side winding lc unit integrated with the common mode II of circular flat PCB coupling inductance (or circular flat PCB couples electricity Primary side winding and the common mode integrated lc unit I of sense) forward connected in series constitute common mode inductance, its size is:

$L_{CM}={(N_1+N_2)}^2\frac{{\mathrm{\μ}}_0{\mathrm{\μ}}_r{A}_e}{l_e}$

The upper and lower layer capacitance of the integrated lc unit of common mode is as common mode capacitance:

$C_{CM}=\frac{{\mathrm{\ϵ}}_0{\mathrm{\ϵ}}_r{w}_1{l}_1}{d_1}$

In formula, l₁Total length for common mode integrated lc unit Upper coil wires.

The integrated LC structure of single turn is as differential mode capacitor:

$C_{DM}=\frac{{\mathrm{\ϵ}}_0{\mathrm{\ϵ}}_r{w}_3{l}_2}{d_3}$

In formula, l₂Total length for single turn integrated LC structure coil.

The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art For, some improvement can also be made under the premise without departing from the principles of the invention, these improvement also should be regarded as the present invention's Protection domain.

Claims (3)

1. the whole plane electromagnetic interface filter integrated morphology that a circular flat PCB coupling inductance is constituted, it is characterised in that: The common mode inductance that each acts as including circular flat PCB coupling inductance (601) and leakage inductance thereof, differential mode inductance, differential mode collection Become electric capacity I (602) and differential mode integrated capacitance II (610), common mode integrated lc unit I (605) and the integrated LC of common mode Unit II (607), described circular flat PCB coupling inductance (601) includes PCB substrate, is embedded into PCB substrate On round ceramic planar magnetic core (401) and PCB printed circuit cable (402), wherein PCB printed circuit cable (402) bag Having included two, two ends of a described wherein PCB printed circuit cable (402) are respectively E, F end, another root PCB Two ends of printed circuit cable (402) are respectively G, H end, described E, F end place PCB printed circuit cable (402) and G, H end place PCB printed circuit cable (402), respectively as the former and deputy limit winding of round ceramic planar magnetic core, pass through The metallic vias of PCB substrate is wound on magnetic core, described differential mode integrated capacitance I (602) and differential mode integrated capacitance II (610) Structure identical, it includes the medium substrate (502) as differential mode capacitor, in medium substrate (502) upper and lower plane It is plated in full symmetric single turn spiral winding I (501) and single turn spiral winding II (503), single turn spiral winding I (501) With the end points of single turn spiral winding II (503) according to breach numbered M, P, N, Q, described differential mode clockwise The M of integrated capacitance I (602)₁And N₁The input as wave filter, described differential mode integrated capacitance II is drawn by wire (610) P₂And Q₂Outfan as wave filter.

2. the integrated knot of whole plane electromagnetic interface filter that circular flat PCB coupling inductance as claimed in claim 1 is constituted Structure, it is characterised in that: the P of described differential mode integrated capacitance I (602)₁And Q₁Connect circular flat PCB coupling inductance respectively (601) E end and G end.

3. the integrated knot of whole plane electromagnetic interface filter that circular flat PCB coupling inductance as claimed in claim 2 is constituted Structure, it is characterised in that: described common mode integrated lc unit I (605) and the structure of common mode integrated lc unit II (607) Identical, it includes the medium substrate (302) as the integrated lc unit of common mode, on the upper strata of medium substrate (302), applies If multiple radiuses increase successively, end to end semicircular planform spiral winding (301), described semicircular planform helix Outermost layer and the innermost layer end points of circle (301) are designated as A and B respectively, the whole copper-clad of lower floor of medium substrate (302) (303) ground connection afterwards, described ground plane end points is designated as C, D, the A of described common mode integrated lc unit II (607)₂With B₂Respectively with H end and the N of differential mode integrated capacitance II (610) of circular flat PCB coupling inductance (601)₂It is connected, The M of described differential mode integrated capacitance II (610)₂The B of lc unit I (605) integrated with common mode₁It is connected, described common mode The A of integrated lc unit I (605)₁It is connected with the F end of circular flat PCB coupling inductance (601).