US20160307695A1 - Magnetic structures for low leakage inductance and very high efficiency - Google Patents

Magnetic structures for low leakage inductance and very high efficiency Download PDF

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Publication number
US20160307695A1
US20160307695A1 US14/660,901 US201514660901A US2016307695A1 US 20160307695 A1 US20160307695 A1 US 20160307695A1 US 201514660901 A US201514660901 A US 201514660901A US 2016307695 A1 US2016307695 A1 US 2016307695A1
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magnetic
posts
winding
presented
primary
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English (en)
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Ionel Jitaru
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Rompower Technology Holdings LLC
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Ionel Jitaru
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Priority to US14/660,901 priority Critical patent/US20160307695A1/en
Publication of US20160307695A1 publication Critical patent/US20160307695A1/en
Assigned to ROMPOWER TECHNOLOGY HOLDINGS, LLC reassignment ROMPOWER TECHNOLOGY HOLDINGS, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JITARU, IONEL
Priority to US16/368,186 priority patent/US10937590B2/en
Priority to US17/845,609 priority patent/US11763984B2/en
Priority to US18/368,513 priority patent/US20240006119A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
    • G11C11/06—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F2027/408—Association with diode or rectifier

Definitions

  • the present invention relates mechanical construction and its mechanical results for transformer and inductances with utilization in power conversion, data transition and communication.
  • FIG. 1 is presented two methods of splitting the current.
  • One is described in U.S. Pat. No. 4,665,357 wherein there are employed multiple independent transformers with the primary in series, referred also as a Matrix transformer.
  • Another methodology is described in U.S. Pat. No. 7,295,094 B2.
  • the structure presented in U.S. Pat. No. 7,295,094B2 has several advantages over the structure presented in U.S. Pat. No. 4,665,357 such the increase of the total magnetizing inductance and a reduction of the magnetic core volume, though limited reduction because all the windings do share the same magnetic core.
  • the magnetic structures described in this invention provide an improved magnetic core configuration and winding arrangement.
  • the magnetic structures described in this invention do offer a much lower leakage inductance, a better utilization of the copper a smaller footprint and in some implementations are very suitable for air core magnetics for very high frequency operation.
  • the embodiments of this invention can be used for transformer application or inductive elements.
  • a magnetic circuit element includes a circuit board, a plurality in excess of two magnetic flux conducting posts penetrating through the circuit board, at least two magnetic flux conducting plates connecting on both sides of the magnetic flux conductive posts, at least two connected primary winding encircling the magnetic posts, and at least two connected secondary winding encircling the magnetic posts.
  • power components are placed in series or in parallel with the winding and become part of the primary or secondary winding.
  • the entire magnetic structure can be encircled by a suitable shaped, magnetic flux conductive device and interconnections pins are placed inside and outside of the encircling the suitable shaped magnetic flux conductive device, where the pins are connected to a motherboard.
  • the flux conducting plates, or the flux conducting plates and magnetic flux conductive posts can be removed.
  • a magnetic circuit element with center tap topology including a circuit board, a plurality of magnetic flux conducting posts penetrating through the circuit board, magnetic flux conducting plates connecting on both sides the magnetic flux conductive posts, primary windings encircling the magnetic posts, and secondary windings encircling the magnetic posts, wherein the center tap topology is configured to allow reuse of at least portions of both the primary and secondary windings for current flow in either direction.
  • FIG. 5A , FIG. 5B and FIG. 5C This magnetic structure has four posts, which penetrates through the multilayer structure wherein the windings are embedded.
  • This structure is the result of merging four E type magnetic cores, and in the process, a good portion of the magnetic core material is eliminated. That reduces the total footprint of the magnetic structure and reduces to total core loss, which is proportional with the volume of the core material.
  • the secondary winding merge as well as depicted in FIG. 5B .
  • Each equivalent E shaped core is presented in FIG. 5C . Though the magnetic core with four legs are depicted in other prior art, the copper structures and the placement of the rectifier means changes the mode of operation and the performances.
  • FIG. 9A and 9B In another embodiment depicted in FIG. 9A and 9B is presented the same four-legged magnetic structure wherein the output current flows out of the four openings and under the magnetic rectangular plate with a cutout in the middle to accommodate the four-legged transformer, which represents the output inductor.
  • the output connectors By placing the output connectors as depicted, the current is split and the magnetic core of the output choke does not have to penetrate the multilayer structure. In this way, we increase the utilization of the copper and decrease the total footprint of the transformer and output choke.
  • This embodiment is very suitable for high output current applications.
  • the magnetic configurations using the center posts can be implemented in different configuration as is presented in FIG. 12 , FIG. 13 and FIG. 14 .
  • FIG. 10 depicts a more details drawing of the four-legged magnetic structure employing two magnetic core structures and a multilayer PCB.
  • FIG. 11 the center cutouts in the plates 111 and 113 are eliminated for technological reasons, though there is not a magnetic flux flowing through that section.
  • FIG. 14 is presented a low profile magnetic structure employing a multitude of center posts.
  • This magnetic structure can be a transformer structure or an inductive structure.
  • On advantage using this configuration as a storage element is the fact that the gap will be distributed among all the center posts.
  • the magnetic plate can be removed an in that case we can have only the center posts as in FIG. 15 or air core as depicted in FIG. 16 . There is a possibility to have just the center posts with a small plate at one end of it, or both, leaving a gap between the plates. In FIG. 17 the ac to dc ratio, it is very low for an air core and this magnetic structure is highly suitable for very high frequency applications.
  • FIG. 1 Shows prior art distributed magnetic structures using a multitude of the magnetic elements wherein the primaries are placed in series.
  • FIG. 2 Shows our equivalent schematic of the preferred embodiment wherein the magnetic elements are coupled.
  • FIG. 3A Depicts a transformer, employing center tap including the rectifiers.
  • FIG. 3B Shows the secondary winding implementation of the transformer presented in FIG. 3A .
  • the secondary winding implementation, in a transformer structure using a U core is one of the embodiments of this invention, wherein the copper utilization of the secondary windings is significantly improved over conventional center tap implementation.
  • FIG. 4A Shows a transformer structure without the center tap using a full bridge rectification.
  • FIG. 4B Shows the secondary winding implementation of the transformer presented in FIG. 4A .
  • FIG. 5A Shows the equivalent schematic of the four-legged magnetic structure with center tap.
  • FIG. 5B Shows the secondary winding implementation of the four-legged transformer presented in FIG. 5A .
  • FIG. 5C Shows the equivalent four transformers that are part of the four-legged transformer.
  • FIG. 6A through 6D shows the metal etch layers comprising winding in the transformer using the U core implementation described in FIG. 3A and 3B .
  • FIG. 7A and 7B Shows the metal etch comprising winding for the four-legged magnetic structure described in FIG. 5A and 5B .
  • FIG. 8A and 8B Shows the metal etch comprising winding for the four-legged magnetic structure having two turns secondary winding.
  • FIG. 9A Shows our equivalent schematic of the embodiment wherein we introduce a novel implementation for the output inductor.
  • FIG. 9B Shows an implementation of the four-legged magnetics structure from FIG. 9A together with a novel output inductor.
  • FIG. 10 Shows three-dimensional drawing of the four-legged magnetic structure.
  • FIG. 11 Shows three-dimensional drawing of the four-legged magnetic structure wherein the cutout in the upper and lower plate is removed.
  • FIG. 12 Shows a potential implementation of the multi legged magnetic structure
  • FIG. 13 Shows another potential implementation of the multi legged magnetic structure.
  • FIG. 14 Shows an implementation of the multi-legged magnetic structure employing ferrite material for the posts and the horizontal plates.
  • FIG. 15 Shows an implementation of the multi-legged magnetic structure employing ferrite material for the posts and without horizontal plates.
  • FIG. 16 Shows an implementation of the multi-legged magnetic structure without any magnetic material.
  • FIG. 17 Shows ratio AC/DC in the secondary winding for the magnetic structures presented in FIG. 14 , FIG. 15 and FIG. 16 .
  • FIG. 3A Presented in FIG. 3A is presented a center tap transformer structure having a primary winding 38 , and two identical secondary windings 34 and 36 .
  • the secondary rectifier means can be schottky diodes, synchronous rectifier using silicon power mosfets, GANs or other technologies.
  • the negative output it might be connected to the output ground.
  • an AC signal is applied to the primary winding between 40 and 42 , which can be generated, by a full bridge configuration, half bridge or other topologies.
  • one of the rectifiers means conducts and when the polarity changes the other rectifier means will conduct. Because only one of the secondary winding is conducting current during each polarity the copper in the secondary is not fully utilized. This is one of the major disadvantages of the center tap topology. In addition to that, in center tap topologies there is a leakage inductance between the two secondary windings, which will delay the current flow from a winding to another. In the present embodiment described in FIG. 3B these two drawbacks associated with center tap are minimized. In FIG. 3B are presented four layers of a multilayer structure, from 50 a through 50 d, wherein the secondary winding is implemented.
  • a U core shape magnetic core penetrates through the multilayer PCB through the cutout 54 A and 54 B.
  • a conductive material usually copper connected to the cathodes of the rectifier means, one on layer 50 A connected to the cathode of 30 and another one placed on layer 50 b connected to the rectifier means 32 .
  • the cutouts 54 A and 54 B are surrender by conductive material, which is connected to 46 .
  • the rectifier means 30 During one of the polarities when the rectifier means 30 conducts the current flows through the conductive material between the lags of the U core from the anode connected to 44 and through the rectifier means, 30 , and further through the via 401 and 402 on layer 50 c to the 46 . Another path for current flow is through the rectifier means 30 and via 403 and further towards 46 .
  • the current will flow from 44 , through 32 , and further on layer 50 b through the conductive material, 36 , placed between the cutouts, 54 A and 54 B, and further through via 404 and 405 to layer 50 d towards 46 .
  • Another path for the current flowing through 32 is through via 406 to layer 50 d and through the conductive material in between the cutouts 54 A and 54 B towards 46 .
  • one turn secondary for this magnetic structure will circle the 54 A and 54 B, the portion of the secondary wherein the current is flowing in only one direction is reduced the conductive material between the cutouts, 54 A and 54 B, such as 34 and 36 .
  • the portion of 44 and 46 which surrounds the cutouts 54 A, and 54 B the current is flowing in both directions.
  • 3B is the fact that the copper is placed over the entire section of the primary windings allowing the current to flow in order to cancel the magnetic field produced by the primary winding.
  • the rectifier means 32 and 30 are placed as the part of the secondary winding eliminating the end effect losses and reducing the stray inductance.
  • FIG. 4A is presented a transformer structure using full bridge rectification. It is composed by a primary winding 138 , a secondary winding 137 , four rectifier means 133 , 135 , 134 , and 135 .
  • the rectified voltage is connected to 141 and 142 .
  • the primary winding terminations 139 and 140 are connected to an AC source, which can be generated, by a full bridge, half bridge or any other topologies.
  • FIG. 4B is presented the secondary winding arrangement for one turn secondary. For one of the polarities the current is flowing through 136 , the copper section, 137 A and 137 B placed in between the cutouts 54 A and 54 B, and further through 133 , through the via 407 to the layer 410 B towards 141 .
  • the current will flow from 142 , through 135 and further through the copper section, 137 A and 137 B placed between the cutouts 54 A and 54 B, and further through rectifier means 134 and through via 408 to the layer 410 B, towards 141 .
  • the secondary copper utilization it is inherently very good because the secondary winding 137 does conduct during both polarities.
  • the winding structure presented in FIG. 4B however does incorporate the rectifier means, 133 , 136 , 134 and 135 as part of the secondary winding eliminating the end effects and reducing the stray inductance.
  • FIG. 5A is presented the equivalent circuit of one embodiment of this invention wherein a four legged magnetic core structure is used.
  • the T 1 is coupled with T 2
  • T 2 is coupled with T 3
  • T 3 is coupled with T 4
  • further T 4 is coupled with T 1 .
  • FIG. 5C is presented the definition of each transformer from T 1 to T 4 .
  • Each transformer is represented as an E core transformer having as a center post the entire cylindrical leg and two outer posts, which are half of the cylindrical legs in its direct vicinity.
  • the shape of the four legs however can be rectangular or any other shape. Because the transformers T 1 ,T 2 ,T 3 and T 4 doe share sections of the same cylindrical posts, there is a coupling between them.
  • FIG. 5A The equivalent schematic of the magnetic structure implemented in FIG. 5B is presented in FIG. 5A .
  • An AC signal is applied between 360 and 362 , which can be generated by a full bridge, a half bridge structure, or any other double-ended topology.
  • the rectifier 376 and 374 are activated and the current flows from the negative voltage V ⁇ , 384 , which in many application is connected to the ground, further through the copper section shaped as a cross, 366 A, located on the layer 70 a, towards the via connection 411 , 412 and 409 , 410 .
  • the via 411 , 412 and 409 , 410 the current flows further on the layer 70 C towards the 382 .
  • a parallel path for the current during this polarity is through the rectifier means 376 and 374 , on the layer 70 C further through 366 B towards 382 .
  • the other rectifier means 380 and 378 are activated and the current will flow further on layer 70 b through the copper section shaped as a cross 368 A towards via 413 , 414 and 415 , 416 and further to the layer 70 d towards 382 .
  • Another path for the current flowing through 378 and 380 is through 368 B on layer 70 d towards 382 .
  • the current flowing through 384 , 382 which surrender the four-lagged magnetic structure, and through 366 A, 368 B, 366 B and 368 B is aimed to cancel the magnetic field produced by the primary winding.
  • the rectifier means 376 , 380 , 374 and 378 are part of the secondary winding eliminating in this way the end effects and the stray inductance.
  • the end effect is characterized by the ac losses in the copper after the secondary winding leaves the transformer to make the connection to the secondary means.
  • the magnetic structure depicted in FIG. 5B does have several advantages over the conventional magnetic using an E core and even U shape cores. First of all the leakage inductance is significantly reduced. In addition to this, the ac losses in the windings are further reduced because the magnetic field intensity between primary and secondary is four times reduced by comparison to one magnetic core structure. In addition to this, the core volume of this configuration is it smaller than smaller than one core configuration.
  • the placement of the rectifier means as a part of the secondary ending eliminated the end effects and the stray inductance between the secondary winding and the rectifier means.
  • the coupling between the four equivalent transformers as depicted in FIG. 5A reduces the thickness of the ferrite plates 112 and 113 , which are placed on top of the four cylindrical legs 115 A, 115 B, 115 C and 115 D as depicted in FIG. 10 .
  • FIG. 6A through 6D are presented metal etch layers comprising windings for the transformer structure presented in FIG. 3A .
  • the winding implementation of FIG. 6A through 6D is optimized in respect of layers utilization for the purpose of industrialization.
  • FIG. 3B we are using four layers while in FIG. 6A we are using just two layers.
  • FIG. 6A is presented the top layer and layer 2 .
  • the cutouts for the magnetic core, 54 A and 54 B are surrender by a copper connected to ground which is FIG. 3A is labeled 44 .
  • the cutouts for the magnetic core, 54 A and 54 B are surrender by copper connected to 46 , as per FIG. 3A .
  • 3A are implemented by using two synchronous rectifiers in parallel.
  • the copper section, 34 placed between the cutouts 54 A and 54 B, is connected to the group of via 462 .
  • the drain of the rectifier means 30 is placed on two pads connected to the group of via 460 and 461 .
  • the rectifier means 32 are conducting the current is flowing from 44 through the rectifier means 32 further through 34 and through the via 462 to the layer 2 where the current flows to 46 .
  • the rectifier means 30 are conducting the current is flowing from 44 through the rectifier means 30 further through 460 and 461 to layer 2 and further through the copper placed between the cutouts, 54 A and 54 B, towards 46 .
  • FIG. 6B, 6C are presented the primary windings, which are incorporated in layer 3 , 4 , 5 and 6 .
  • FIG. 6D is presented the secondary winding together with the rectifier meas.
  • These layers are identical to the layer 1 , the top, and layer 2 . However, on these layers, the winding configuration is placed in a mirror arrangement. The massive copper arrangement around the magnetic core legs allows the current to flow optimally and choose its own path in order to cancel the magnetic field produced by the primary winding. This helps in further reducing the leakage inductance in the transformer structure.
  • FIG. 7 is presented an optimized implementation of the magnetic structure of FIG. 5B .
  • the four legged magnetic structure is using just two layers for the secondary winding unlike four layers as depicted in FIG. 5B .
  • This implementation is for industrialization wherein the cost effectiveness is very important.
  • the rectifier means 376 and 374 conducts and the current will flow from 384 through 376 , 374 through the via 482 and 485 to the second layer.
  • the current will continue to flow in both directions, one between the cutouts 386 A and 386 D and between cutouts 386 B and 386 C towards V+, 382 .
  • the current will flow from 384 through rectifier means 380 and 378 towards the via 480 , 481 and respectively 483 and 484 , to the layer 2 and further to V+, 382 .
  • FIG. 7A The implementation of the secondary winding depicted in FIG. 7A has the advantage of using just two layers.
  • FIG. 7B is presented all the layers, starting with to top two layers incorporated secondary winding and the bottom two layers, layer 9 and layer 10 wherein secondary windings are also implemented.
  • the layer 1 and layer 2 and layers 9 and 10 are mirror imagine to each other.
  • the primary windings are implemented on layers 3 , 4 , 5 , 6 , 7 and 8 .
  • FIG. 8A is presented one of the embodiments of the four-legged magnetic structure wherein we have two turns in the secondary winding.
  • the rectifier means 376 and 374 conduct and the current will flow from 384 through 376 , 374 and further around the magnetic core cutout 386 A, 386 B and respectively 386 C and 386 D towards via 501 , 502 and respectively 503 , 504 further on the layer 3 where will flow towards V+, 382 .
  • FIG. 8B is presented the 12 layers winding structure wherein the primary windings are implemented in six of the inner layers and the secondary windings are implemented in the top and bottom three layers.
  • FIG. 9A and FIG. 9B is presented another embodiment of this invention wherein there is a unique implementation of the output inductor.
  • the entire four-legged magnetic structure, 520 which can be implemented in one of the configuration described in FIG. 5B, 7A, 7B or 8A, 8B or any other structure.
  • the rectifier means 76 , 74 , 80 and 78 are rectifying the AC voltage injected in the primary winding.
  • a magnetic core composed by four sections 203 A, 203 B, 203 C and 203 D, which connected together.
  • the entire structure can be formed by one magnetic core or four independent sections placed together.
  • the current flowing towards 201 A, 201 B, 201 C and 201 D will flow under the magnetic core.
  • the pins, 201 A, 201 B, 201 C and 201 D are connected further to the motherboard where they will form Vo+, 521 .
  • the pins connected to the V ⁇ , 84 , 202 A, 202 B, 202 C and 202 D are also connected to the motherboard.
  • the implementation of the output choke using a continuous peace of ferrite material, which does not perforate the multiplayer PCB, 82 it, is unique.
  • FIG. 9B symbolizes the connection to the winding structure of the four legged transformer as presented in FIG. 5B, 7A and 7B and 8A and 8B .
  • FIG. 10 is presented the four-legged magnetic configuration.
  • the primary and secondary windings of the transformer are implemented on the multilayer PCB, 111 .
  • the four cylindrical posts penetrate through the holes 386 A, 386 B, 386 C and 386 D.
  • a plate 112 with a cutout 114 A is placed on top making contact with the cylindrical posts directly or using an interface gap.
  • FIG. 11 is presented the same structure with the difference that the cutout 114 A and 114 B is eliminated. There is not a magnetic flux through that cutout but for simplicity of the implementation in case of industrialization, the cutouts can be eliminated.
  • FIG. 12 is presented another arrangement of this multi-legged magnetic structure in a rectangular shape having a multitude of legs.
  • This structure There can be many shapes we can implement this structure, one of them is presented in FIG. 13 .
  • Each magnetic structure starting with the two legged transformer, four-legged transformer and generally N legged transformer can be multiplied and each section can share the same primary winding. They will form power-processing cells and if they share the same primary winding, the leakage inductance between the primary winding and the secondary winding can be further reduced.
  • the multi-legged magnetic structures can be used as transformers or can be used as inductors. In the inductor implementation the gap can be placed on top of each cylindrical leg and create a very efficient distributed gap minimizing in this way the gap effect.
  • FIG. 14 is presented a general multi-legged magnetic structure.
  • the windings are implemented in a multiplayer structure which can be embedded also in a multilayer PCB and there are cylindrical magnetic posts and two magnetic plates, one on top and one on the bottom, as depicted in 550 and 551 .
  • FIG. 15 is presented an implementation wherein the windings are placed in multilayer structure, which can be a multilayer PCB and the magnetic cylindrical post without the ferrite plates on top and bottom, as depicted in 552 and 553 .
  • FIG. 16 is presented an air core structure wherein the magnetic core material is totally removed and the windings are implemented in a multiplayer structure, which can be multilayer PCB.
  • a multiplayer structure which can be multilayer PCB.
  • Such an air core structure has many advantages one of them being much lower AC losses in the winding at high frequency.
  • FIG. 17 is presented the simulate losses in such structures at 1 Mhz and 10 Mhz using posts and plates of magnetic material, just the magnetic posts of magnetic material and without any magnetic material.
  • the major advantage of these magnetic structures, especially for the air core implementation is the fact that the magnetic flux does weave from a loop to another reducing significantly the radiation.
  • This magnetic structure with air core described in 554 contains the magnetic field, and forces it to be parallel with the winding, and it is very suitable for magnetic configuration without magnetic core. In addition to this has a low ac loss for very high frequency application wherein this structure may be used.
  • This magnetic structure will allow power conversion at very high frequency in the range of tens of MHz with high efficiency.
US14/660,901 2014-03-19 2015-03-17 Magnetic structures for low leakage inductance and very high efficiency Abandoned US20160307695A1 (en)

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US14/660,901 US20160307695A1 (en) 2014-03-19 2015-03-17 Magnetic structures for low leakage inductance and very high efficiency
US16/368,186 US10937590B2 (en) 2014-03-19 2019-03-28 Magnetic structures for low leakage inductance and very high efficiency
US17/845,609 US11763984B2 (en) 2014-03-19 2022-06-21 Magnetic structures for low leakage inductance and very high efficiency
US18/368,513 US20240006119A1 (en) 2014-03-19 2023-09-14 Magnetic Structures For Low Leakage Inductance And Very High Efficiency

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US11581119B2 (en) 2019-01-15 2023-02-14 Delta Electronics (Shanghai) Co., Ltd Magnetic device and method of manufacturing the same
US11763976B2 (en) * 2017-08-02 2023-09-19 Abb Power Electronics Inc. Integrated magnetic assemblies and methods of assembling same
JP7391817B2 (ja) 2018-05-28 2023-12-05 台達電子工業股▲ふん▼有限公司 スイッチング電源装置

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US11688543B2 (en) * 2020-02-10 2023-06-27 The Boeing Company Method of creating power control module
CN113628853B (zh) * 2020-05-09 2023-06-16 台达电子企业管理（上海）有限公司 多相耦合电感及多相耦合电感的制作方法
TWI747508B (zh) 2020-09-17 2021-11-21 群光電能科技股份有限公司 平板繞組變壓器
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TWI663611B (zh) 2019-06-21
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EP3120360A1 (fr) 2017-01-25
WO2015142961A1 (fr) 2015-09-24
TW201830421A (zh) 2018-08-16
TWI632569B (zh) 2018-08-11

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