WO2023222094A1 - Dispositif magnétique, circuit résonant et alimentation électrique de pilotage de del - Google Patents

Dispositif magnétique, circuit résonant et alimentation électrique de pilotage de del Download PDF

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Publication number
WO2023222094A1
WO2023222094A1 PCT/CN2023/095108 CN2023095108W WO2023222094A1 WO 2023222094 A1 WO2023222094 A1 WO 2023222094A1 CN 2023095108 W CN2023095108 W CN 2023095108W WO 2023222094 A1 WO2023222094 A1 WO 2023222094A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
magnetic column
column
pcb board
pcb
Prior art date
Application number
PCT/CN2023/095108
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English (en)
Chinese (zh)
Inventor
梅进光
杨军
Original Assignee
英飞特电子（杭州）股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 英飞特电子（杭州）股份有限公司 filed Critical 英飞特电子（杭州）股份有限公司
Publication of WO2023222094A1 publication Critical patent/WO2023222094A1/fr

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Classifications

    • 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
    • H01F27/006—Details of transformers or inductances, in general with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • This application relates to the field of power supplies, and in particular to a magnetic device, a resonant circuit and an LED driving power supply.
  • the magnetic components of a typical resonant circuit LLC circuit include a resonant inductor and a transformer.
  • the transformer includes a skeleton and a magnetic core. Two winding slots are provided on the skeleton to wind the primary and secondary windings respectively. Two E-type The magnetic core and the wound bobbin form a transformer.
  • This transformer has a high leakage inductance and can be used to replace the resonant inductor. Therefore, this transformer structure actually integrates the leakage inductance and the magnetic device of the transformer, making the switching power supply smaller. Smaller, lower cost.
  • planar transformers also known as matrix transformers
  • the planar transformer removes the skeleton, sets the primary and secondary windings on the PCB, and makes holes on the PCB so that the magnetic core passes directly through the PCB.
  • Existing planar transformers are used in fields such as server power supplies to meet the power supply needs of low voltage and high current.
  • a matrix transformer is provided with a central magnetic column and multiple secondary magnetic columns surrounding the central magnetic column. Multiple windings are provided on the PCB board.
  • the primary winding is wound around the central magnetic column, and the multiple secondary windings are respectively It is wound around the secondary magnetic column to realize multiple transformers, and then the primary windings of multiple transformers are connected in series and the secondary windings are connected in parallel to achieve the effect of low voltage and high current.
  • this kind of matrix transformer has a large number of magnetic columns, complicated wiring of the windings on the PCB board, and high design difficulty. It cannot be directly applied to non-low voltage and high current scenarios. Using the matrix transformer in the existing technology will inevitably increase the number of winding designs. The complexity and cost of the PCB board.
  • the purpose of this application is to provide a magnetic device, a resonant circuit and an LED driving power supply with a simple structure and a wide range of applications.
  • the specific plan is as follows:
  • a magnetic device including a magnetic core and a multi-layer PCB board, wherein:
  • the magnetic core includes: two parallel magnetic flat plates, and several magnetic column pairs arranged vertically between the two magnetic flat plates.
  • Each magnetic column pair includes a first magnetic column and a second magnetic column.
  • Each magnetic column pair is centered on a third magnetic column.
  • the cross-sectional area of one magnetic column is smaller than the cross-sectional area of the second magnetic column;
  • All PCB boards are located between two magnetic plates.
  • Each PCB board is provided with through holes, and all pairs of magnetic posts pass through the PCB board through the through holes;
  • the multi-layer PCB board includes several layers of first PCB boards and several layers of second PCB boards;
  • the first PCB board of each layer is provided with a primary winding, and the primary winding is wound around the magnetic column pair;
  • the second PCB board of each layer is provided with a secondary winding, and the secondary winding is wound around the second magnetic column in the pair of magnetic columns wound by the primary winding.
  • the two magnetic flat plates are the first flat plate and the second flat plate respectively, and all pairs of magnetic columns and the second flat plate have an integrated structure.
  • the vertical distance between each first magnetic column and the first flat plate is determined by the target resonant inductance
  • the vertical distance between each second magnetic column and the first flat plate is determined by the target excitation inductance.
  • the ratio of the cross-sectional area of the first magnetic column to the cross-sectional area of the second magnetic column is determined by the target resonant inductance.
  • the value range of the cross-sectional area ratio is [0.05, 1).
  • the vertical distance between the first magnetic column and the second magnetic column in each magnetic column pair is determined by the target resonant inductance.
  • the first PCB board and the second PCB board are arranged alternately.
  • all primary windings are connected through blind holes, buried holes or vias to form a total primary winding
  • All secondary windings are connected through blind holes, buried holes or vias to form a total secondary winding.
  • this application also discloses a resonant circuit including any of the above magnetic devices.
  • this application also discloses an LED driving power supply, including the above resonant circuit.
  • the magnetic core includes: two parallel magnetic flat plates, and several pairs of magnetic pillars arranged vertically between the two magnetic flat plates. Each pair of magnetic pillars It includes a first magnetic column and a second magnetic column, and the cross-sectional area of the first magnetic column in each magnetic column is smaller than the cross-sectional area of the second magnetic column; all PCB boards are located between the two magnetic flat plates, and each PCB board is There are through holes through which all magnetic column pairs pass through the PCB board; the multi-layer PCB board includes several layers of first PCB boards and several layers of second PCB boards; the first PCB board of each layer is provided with a primary winding.
  • the side winding is wound around the pair of magnetic columns; the second PCB board of each layer is provided with a secondary winding, and the secondary winding is wound around the second magnetic column in the pair of magnetic columns wound by the primary winding.
  • Figure 1 is a structural distribution diagram of a magnetic device in an embodiment of the present application.
  • Figure 2 is a structural distribution diagram of the first magnetic core in the embodiment of the present application.
  • Figure 3 is a structural distribution diagram of the second magnetic core in the embodiment of the present application.
  • Figure 4 is a structural distribution diagram of the third magnetic core in the embodiment of the present application.
  • Figure 5a is a structural distribution diagram of a resonant output rectifier circuit in an embodiment of the present application.
  • Figure 5b is a structural distribution diagram of another resonant output rectifier circuit in the embodiment of the present application.
  • the traditional matrix transformer has a large number of magnetic columns, complicated wiring of the windings on the PCB board, and high design difficulty. It cannot be directly applied to non-low voltage and high current scenarios. Using the matrix transformer in the existing technology will inevitably increase the complexity of the winding design. degree and cost of the PCB board.
  • this application achieves the function of the transformer and the function of the transformer magnetic leakage replacing the resonant inductor, and at the same time increases the magnetic field.
  • the magnetic device of this application has lower cost and volume, simpler structure and wider application scenarios.
  • the embodiment of the present application discloses a magnetic device, as shown in Figure 1, which includes a magnetic core and a multi-layer PCB board, wherein:
  • the magnetic core includes: two parallel magnetic flat plates 1, and several magnetic column pairs arranged vertically between the two magnetic flat plates 1.
  • Each magnetic column pair includes a first magnetic column 21 and a second magnetic column 22.
  • Each magnetic column pair includes a first magnetic column 21 and a second magnetic column 22.
  • the cross-sectional area of the first magnetic column 21 in the center of the column is smaller than the cross-sectional area of the second magnetic column 22;
  • All PCB boards are located between the two magnetic plates 1, each PCB board is provided with through holes, and all pairs of magnetic columns pass through the PCB boards through the through holes;
  • the multi-layer PCB board includes several layers of first PCB boards and several layers of second PCB boards;
  • the first PCB board of each layer is provided with a primary winding 31, and the primary winding 31 is wound around the magnetic column pair;
  • a secondary winding 32 is provided on the second PCB of each layer.
  • the secondary winding 32 is wound around the second magnetic column 22 centered on the magnetic column wound by the primary winding 31 .
  • all PCB boards serve as carriers of the primary winding 31 or the secondary winding 32 and are arranged between the two magnetic plates 1 through the through holes.
  • the primary windings 31 and 32 on the PCB board The secondary windings 32 respectively surround corresponding magnetic columns, and are generally wound in a figure-8 shape, as shown in Figure 1; specifically, for the primary winding 31 on any first PCB board, the primary winding 31 is aligned with the magnetic columns. It is wound as a unit, that is, the primary winding 31 simultaneously surrounds the first magnetic column 21 and the second magnetic column 22 in the pair of magnetic columns.
  • the second magnetic column 22 will be wound by any second PCB board.
  • this winding method forms a transformer, and at the same time causes the magnetic device to generate leakage inductance.
  • This leakage inductance can replace the resonant inductor in the resonant circuit. That is, in this embodiment, the magnetic device integrates the resonant circuit needs Transformers and inductors, when this magnetic device is applied to a resonant circuit, the number of components in the resonant circuit is reduced, reducing cost and volume.
  • a pair of magnetic columns in the magnetic device only includes a first magnetic column 21 and a second magnetic column. 22, right There is one primary winding 31 and one secondary winding 32, which eliminates the need for the integration of multiple transformers in the matrix transformer in the prior art, and does not require complex structures such as primary series connection and secondary parallel connection of multiple transformers.
  • the first magnetic column 21 and the second magnetic column 22 on each magnetic column pair are arranged in the X direction, and all magnetic column pairs are arranged perpendicular to the X direction on the plane of the plate. direction arrangement, correspondingly, the number of primary windings 31 on the first PCB board of each layer and the number of secondary windings 32 on the second PCB board of each layer are the same as the number of magnetic column pairs.
  • the primary windings 31 are on The arrangement on the first PCB and the distribution of the secondary windings 32 on the second PCB correspond to the positions of the magnetic column pairs or the second magnetic columns 22 .
  • the magnetic core includes: two parallel magnetic flat plates, and several pairs of magnetic columns vertically arranged between the two magnetic flat plates.
  • Each of the magnetic column pairs includes a first magnetic column and a second magnetic column, and the cross-sectional area of the first magnetic column in each of the magnetic column pairs is smaller than the cross-sectional area of the second magnetic column;
  • all of the PCB boards Located between the two magnetic plates, each layer of the PCB is provided with a through hole, and all pairs of magnetic columns pass through the PCB through the through hole;
  • the multi-layer PCB includes several layers A first PCB board and several layers of second PCB boards; the first PCB board of each layer is provided with a primary winding, and the primary winding is wound around the magnetic column pair; the second PCB board of each layer is A secondary winding is provided, and the secondary winding is wound around the second magnetic column in the pair of magnetic columns wound by the primary winding.
  • this application achieves the function of the transformer and the function of the transformer magnetic leakage replacing the resonant inductor, and at the same time increases the magnetic field.
  • the magnetic device of this application has lower cost and volume, simpler structure and wider application scenarios.
  • the embodiment of the present application discloses a specific magnetic device. Compared with the previous embodiment, this embodiment explains the technical solution as follows. specific:
  • the two magnetic flat plates 1 are respectively a first flat plate and a second flat plate, and all pairs of magnetic columns and the second flat plate have an integrated structure. It can be understood that the arrangement of the integrated structure ensures that there is no air gap between the pair of magnetic pillars and the second flat plate, and the air gap on the magnetic device only exists between the pair of magnetic pillars and the first flat plate.
  • the vertical distance between each first magnetic column 21 and the first flat plate is determined by the target resonant inductance;
  • the vertical distance between each second magnetic column 22 and the first flat plate is determined by the target excitation inductance.
  • the vertical distance here is the air gap distance between the magnetic cores.
  • the vertical distance between the first magnetic column 21 and the first flat plate has a correlation with the leakage inductance of the magnetic device. Since the leakage inductance is set to replace the resonant inductance, the first magnetic inductance can be determined according to the required target resonant inductance.
  • the vertical distance between the second magnetic column 21 and the first flat plate; similarly, the vertical distance between the second magnetic column 22 and the first flat plate has a correlation with the excitation inductance of the transformer. Therefore, the distance between the second magnetic column 22 and the first flat plate can be determined according to the required target excitation inductance. The vertical distance of the first plate.
  • the determination of the vertical distance between the first magnetic column 21 and the first flat plate and the vertical distance between the second magnetic column 22 and the first flat plate are independent of each other. Each is optimized and does not interfere with each other. Therefore, when specifically determining the vertical distance, the first flat plate and the first flat plate need to be considered.
  • target resonant inductance in this embodiment is also related to the cross-sectional area ratio and vertical distance of the first magnetic column 21 and the second magnetic column 22, specifically:
  • the cross-sectional area ratio between the cross-sectional area of the first magnetic pillar 21 and the cross-sectional area of the second magnetic pillar 22 is determined by the target resonant inductance.
  • the cross-sectional area ratio ranges from [0.05, 1).
  • the vertical distance between the first magnetic column 21 and the second magnetic column 22 in each magnetic column pair is determined by the target resonant inductance, that is, the vertical distance between the first magnetic column 21 and the second magnetic column 22 in each magnetic column pair.
  • the size of the leakage inductance can also be adjusted for distance, and the vertical distance between the first magnetic column 21 and the second magnetic column 22 of each magnetic column is determined according to the required inductance value of the target resonant inductance.
  • the shape of the first magnetic column 21 and the second magnetic column 22 of each magnetic column is not strictly regulated except that it is a standard cylinder. It can be in any shape, including but not limited to circles, rectangles, rounded rectangles, and beveled rectangles, and chamfers can also be added according to design requirements.
  • the cross section of the first magnetic column 21 is circular, and the second magnetic column 21 has a circular cross section.
  • the cross section of the magnetic column 22 is rectangular.
  • the cross section of the first magnetic column 21 is rectangular, and the cross section of the second magnetic column 22 is a rounded rectangle.
  • the first magnetic column 21 and the second magnetic column 22 have a rectangular cross section.
  • FIGS. 2 to 4 are schematic diagrams taking two magnetic column pairs as an example, and other numbers of magnetic column pairs can also be positioned or shaped according to the above description.
  • the embodiment of the present application discloses a specific magnetic device. Compared with the previous embodiment, this embodiment explains the technical solution as follows.
  • the first PCB board serves as the carrier of the primary winding 31, and the second PCB board serves as the carrier of the secondary winding 32.
  • all primary windings 31 wound on the same magnetic column pair should have the same winding direction to ensure that the direction of the magnetic field is consistent and prevent the magnetic circuits from canceling each other.
  • the secondary windings 32 wound on the same second magnetic column 22 should have the same winding direction.
  • the secondary windings 32 of different layers and the primary windings 31 of different layers are interspersed with each other, and at least one layer of second PCB boards is provided between the two layers of first PCB boards.
  • the layers of PCB boards can be regarded as "original” -The “symmetrical” clamping form of "vice-original” can effectively reduce the interaction between current and magnetic fields, reduce electromagnetic interference, and at the same time reduce the copper loss of magnetic devices. Therefore, usually the first PCB board and the second PCB board are arranged alternately. Specifically, there is at least one layer of second PCB board between any two adjacent first PCB boards, and any two adjacent layers of second PCB board There is at least one layer of first PCB board between them.
  • similar windings in different layers can be electrically connected through buried holes, blind holes or via holes.
  • all primary windings 31 are connected through blind holes, buried holes or via holes to form a total primary winding;
  • all secondary windings 32 are connected through blind holes, buried holes or via holes to form a total secondary winding.
  • the total secondary winding formed by all the secondary windings 32 can be a tapped winding, and its resonant output rectification circuit can be as shown in Figure 5a.
  • the total secondary winding can also be a two-terminal winding, and its resonant output rectifier The circuit can be shown in Figure 5b.
  • an embodiment of the present application also discloses a resonant circuit, including the magnetic device described in any of the above embodiments.
  • the resonant circuit is any resonant circuit including a resonant inductor and a transformer.
  • the resonant circuit includes but is not limited to an LCC resonant circuit and an LLCC resonant circuit.
  • the magnetic device serves as an integrated component of the transformer and the resonant inductor in the resonant circuit.
  • an embodiment of the present application also discloses an LED driving power supply, including a resonant circuit as described in any of the above embodiments.
  • the resonant circuit and LED driving power supply in this embodiment have the same technical effect as the magnetic device in the above embodiment, and will not be described again here.
  • the embodiments of this application provide a magnetic device, a resonant circuit and an LED driving power supply, which are used in the field of power supply.
  • the transformer function and the transformer magnetic leakage replacing the resonant inductor function are realized.
  • the utilization rate of the magnetic core is increased.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Dc-Dc Converters (AREA)

Abstract

La présente demande divulgue un dispositif magnétique, un circuit résonant et une alimentation électrique de pilotage de DEL, se rapportant au domaine des alimentations électriques. Le dispositif magnétique comprend un noyau magnétique et une pluralité de couches de cartes de circuit imprimé, le noyau magnétique comprenant deux cartes plates magnétiques et plusieurs paires de colonnes magnétiques ; la zone de section d'une première colonne magnétique dans chaque paire de colonnes magnétiques est inférieure à celle d'une seconde colonne magnétique ; chaque couche d'une carte de circuit imprimé est pourvue de trous traversants permettant à toutes les colonnes magnétiques de passer à travers la carte de circuit imprimé ; un enroulement primaire sur chaque couche d'une première carte de circuit imprimé parmi la pluralité de couches de cartes de circuit imprimé est enroulé autour d'une paire de colonnes magnétiques ; et un enroulement secondaire sur chaque couche d'une seconde carte de circuit imprimé est enroulé autour d'une seconde colonne magnétique dans la paire de colonnes magnétiques autour de laquelle l'enroulement primaire est enroulé.
PCT/CN2023/095108 2022-05-18 2023-05-18 Dispositif magnétique, circuit résonant et alimentation électrique de pilotage de del WO2023222094A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202210539488.XA CN114974802A (zh) 2022-05-18 2022-05-18 一种磁性器件、谐振电路及led驱动电源
CN202210539488.X 2022-05-18

Publications (1)

Publication Number Publication Date
WO2023222094A1 true WO2023222094A1 (fr) 2023-11-23

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PCT/CN2023/095108 WO2023222094A1 (fr) 2022-05-18 2023-05-18 Dispositif magnétique, circuit résonant et alimentation électrique de pilotage de del

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CN (1) CN114974802A (fr)
WO (1) WO2023222094A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110729903A (zh) * 2019-09-11 2020-01-24 华为技术有限公司 磁件装置和双向dc变换电路
CN110828126A (zh) * 2019-10-14 2020-02-21 华为技术有限公司 一种平面变压器及有源电路
US20200350117A1 (en) * 2019-05-02 2020-11-05 Virginia Tech Intellectual Properties, Inc. Magnetic integration of matrix transformer with controllable leakage inductance
CN112652439A (zh) * 2020-12-23 2021-04-13 南京航空航天大学 一种变压器和电感混合磁集成结构

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200350117A1 (en) * 2019-05-02 2020-11-05 Virginia Tech Intellectual Properties, Inc. Magnetic integration of matrix transformer with controllable leakage inductance
CN110729903A (zh) * 2019-09-11 2020-01-24 华为技术有限公司 磁件装置和双向dc变换电路
CN110828126A (zh) * 2019-10-14 2020-02-21 华为技术有限公司 一种平面变压器及有源电路
CN112652439A (zh) * 2020-12-23 2021-04-13 南京航空航天大学 一种变压器和电感混合磁集成结构

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