EP0291403A1 - Transformator mit starker Kopplung für Speisekreis mit Zerhacker und Speisekreis mit solchem Transformator - Google Patents

Transformator mit starker Kopplung für Speisekreis mit Zerhacker und Speisekreis mit solchem Transformator Download PDF

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Publication number
EP0291403A1
EP0291403A1 EP88401135A EP88401135A EP0291403A1 EP 0291403 A1 EP0291403 A1 EP 0291403A1 EP 88401135 A EP88401135 A EP 88401135A EP 88401135 A EP88401135 A EP 88401135A EP 0291403 A1 EP0291403 A1 EP 0291403A1
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EP
European Patent Office
Prior art keywords
turns
turn
primary
circuit
transformer
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP88401135A
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English (en)
French (fr)
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EP0291403B1 (de
Inventor
André Pascal
Jean Gadreau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bull SA
Original Assignee
Bull SA
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Filing date
Publication date
Application filed by Bull SA filed Critical Bull SA
Publication of EP0291403A1 publication Critical patent/EP0291403A1/de
Application granted granted Critical
Publication of EP0291403B1 publication Critical patent/EP0291403B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F27/28—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
    • H01F27/2804—Printed windings
    • H01F2027/2809—Printed windings on stacked layers
    • 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
    • H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit

Definitions

  • the present invention relates to a transformer with strong coupling adapted to a switching power supply circuit. It also relates to a supply circuit implementing such a transformer.
  • the invention belongs to the field of manufacturing and optimizing transformers of multilayer technology.
  • the invention makes it possible to obtain a high reproducibility of the electrical and mechanical characteristics minimizing the manufacturing controls and the rejects.
  • a transformer In multilayer technology, a transformer has a primary circuit and a secondary circuit magnetically coupled to each other via a magnetic circuit; these two circuits consist of a stack of turns produced by printed layers on each of which is drawn an almost closed conductive track.
  • a variant according to the invention makes it possible to produce a transformer delivering larger currents by attaching to the multilayer printed circuit turns in cut metal, these turns in cut metal having a greater thickness than that of the printed layers.
  • the invention makes it possible to produce a multilayer transformer with very strong coupling. According to the invention, it is particularly well suited to a switching power supply circuit whose windings are traversed by currents with extremely rapid variations.
  • the transformer according to the invention is also intended to be mounted in switching power supplies whose dimension must be as small as possible. To this end, the transformer according to the invention is made as flat as possible.
  • the transformer according to the invention is optimized from the electrical point of view with a view to minimizing the primary-secondary parasitic current.
  • the present invention relates to a transformer with strong coupling of the multilayer type.
  • the invention is characterized in particular by the fact that two neighboring turns are at potentials as close as possible. When two successive turns belong one to the primary and the other to the secondary, they are at as fixed potentials as possible. The turns brought to variable potentials are as far as possible from the turns brought to fixed potentials.
  • FIG. 1 there is shown a connection diagram of secondary turns.
  • the secondary is produced in two identical halves, each comprising an odd number of turns.
  • each turn of a half-secondary is connected to the terminals of a corresponding turn of the other half-secondary.
  • the turns (1), (2) and (3) of the semi-secondary (7) have terminals A, B, C, D, E, F.
  • the second semi-secondary (8) has turns (4 ), (5) and (6) whose access terminals are respectively G, H, I, J, K, L.
  • the terminals are connected in such a way that the turn (1) responds to the turns (4) and (5), and the turns (2) and (3) to turn (6).
  • a half-transformer is constituted by a stack of turns distributed between a semi-primary (14) and a semi-secondary divided into 2 parts (13) and (15) enveloping the semi-primary.
  • the semi-secondary can be carried out as shown in Figure 1.
  • a part (13) of the semi-secondary is separated from the semi-primary (14) by a special whorl forming a screen (11).
  • the second part (15) of the semi-secondary is separated from the semi-primary (14) by a second special turn (12) forming an electrostatic screen.
  • On the right-hand side of FIG. 2, the direction of the variation of the potentials of turns inside the semi-primary and of the semi-secondary divided into 2 parts is shown.
  • the tip of the arrow represents the increasing direction of a variable potential, the other end represents a fixed potential.
  • the turns are connected so that on both sides of a special turn forming a screen (11) or (12), the turns are at potential as fixed as possible, that towards the inside of the half-transformer, the turns of the semi-primary (14) are at the most variable potentials.
  • FIG 3 there is shown a primary formed by a stack of six turns. Outdoor coils (16) and (21) are intended to produce an electrostatic screen. These two turns are therefore connected to each other in parallel.
  • the active turns (17), (18), (19), (20) are connected so that the potentials are as fixed as possible on the external faces of the stack.
  • the output of the coil (17) is connected to the input of the coil (20), the output of which is connected to the input of the coil (18).
  • the output of the coil (18) is connected to the input of the coil (19) whose output (23) with variable potential constitutes a terminal of a semi-primary.
  • connection is carried out in series of pairs of turns connected in series.
  • the first pair is formed by the series 1 of the coil 1 and the coil 2P, and so on, the pair of row K being constituted by the series of the coil K and the coil 2P-K +1 , the last pair being formed by putting the P turn in series with the P + 1 turn.
  • Each pair of turns has an input on turn K and an output on turn 2P-K + 1.
  • the serialization of two pairs are carried out as in the example in FIG. 3 from the output of the pair K to the input of the pair K + 1.
  • Figure 4 there are shown three embodiments shown in Figures 4a, 4b and 4c of a special turn, the closest to a secondary turn shown in Figure 4a in a semi-primary. These turns forming an electrostatic screen have been shown schematically in (16) and (21) of Figure 3 or (11) and (12) of Figure 2. These three models allow with different efficiencies and complexities to minimize the primary stray current -secondary due to switching, when the transformer is mounted in a switching power supply. For maximum efficiency, the adjacent secondary turn of Figure 4d must have its two ends (24) and (25) diametrically opposite the two ends (26) and (27) of the special turn that it is made according to one or the other of the modes shown in Figures 4a, 4b, 4c.
  • the active secondary turn adjacent to the screen turn and shown in Figure 4d, is composed of a wide conductive track almost closed which spares a central window.
  • the central window makes it possible to stack the printed circuit of turn on a column of magnetic circuit.
  • the turn is cut so as to release an input terminal 24 and an output terminal 25.
  • the cut is preferably made so as to have two elbows so that the electrical resistance in the radial direction is increased on the cut .
  • the cut is obtained by at least two straight lines that are not aligned.
  • the end (26) of a special turn and the end (24) of the adjacent secondary turn must be brought to fixed potentials and decoupled by a capacitor of suitable value for the switching frequency when the transformer is mounted in a switching power supply.
  • such a turn is constituted by two parts oriented in opposite directions from each other.
  • the input (26) of the outer turn (28) is arranged at a fixed potential whose value is as close as possible to that of the next turn.
  • a second turn (29) is made in the opposite direction, one end of which is connected to the inlet (26) of the outer turn (28), the other end (30) is left free.
  • the two turns are arranged as close to each other as possible.
  • the outer turn (28) having ends (26) and (27) is in fact the first turn of the primary winding. It is therefore an active turn of the transformer.
  • This first embodiment is well suited to the production of small transformers, it gives an average efficiency.
  • the inner coil (31) has its ends (32) and (33) diametrically opposite the ends (26) and (27) of the active coil (34).
  • the end (32) of the inner coil (31) is connected to the end (26) of the active turn by a link (35).
  • the end (33) is left free.
  • the two turns must be as close as possible.
  • the link (35) should be as close as possible. This mode has a higher efficiency than the first embodiment and is suitable for medium power transformers.
  • the inner coil (36) is split into two equal parts (36a) and (36b).
  • the ends (37), (38) are opposite one another and diametrically opposite the ends (39), (40) themselves opposite.
  • the end (39) of an inner half-turn (36a) is connected to the end (26) of the active turn (43) by a link (41), the other end (37) of this same half -spire is connected to the end (38) of the second half-turn (26b) by a link (42).
  • the end (40) of the second half-turn (36b) is left free.
  • the active turn and the two inner half-turns must be as close as possible, the connections (41) and (42) must be as close as possible.
  • the link (41) is not a direct link which would erase the effect of the split cleavage of the internal coil (36). It consists of a narrow track which makes a complete turn around the common central region of the two internal (36) and external (43) turns. This mode has the highest efficiency, it is suitable for high power transformers.
  • a stack of 2 printed circuits is provided, each consisting of 14 etched layers on which the connection pads are carried, a central window and a path almost closed intended to make a turn on each engraved layer.
  • FIG. 5 there is shown a succession of 14 layers of a printed circuit intended to produce a transformer according to the invention.
  • the 14 plates are of identical dimensions and each have at the bottom 6 metallized bores assembled two by two to make the connections ADFGIL, CEK, BHJ of FIG. 1 intended for the turns of the two semi-secondary.
  • 8 contacts In the upper part of each printed circuit are arranged 8 contacts each consisting of a metallized hole numbered from 1 to 8 on the plates which use them.
  • the connections of the semi-secondary are made at the bottom of the printed circuit and the connections of the primary are made in the high connections of this printed circuit.
  • the connections of printed plates to printed plates are therefore made via metallized holes.
  • the plates are numbered successively from S1 to S14 by their stacking order in a transformer produced according to the invention.
  • the first plate S1 and the last plate S14 are intended to provide mechanical and electrical protection of the stack.
  • the semi-secondary is made up of the series S2 winding in series with a parallel association of the S3, S4, S11, S12 and S13 turns.
  • the semi-primary consists of the stack of six plates S5 to S10.
  • the end plates S5 and S10 are opposite the two parts of the semi-secondary. They form an electrostatic shield consisting of a half-width turn shown hatched on the plates S5 and S10.
  • the half-primary plates are connected to the terminal block formed by the metallized holes greater than the number of eight on each plate. These metallized holes are numbered from left to right from 1 to 8 and only the terminals used for each plate are numbered in the drawing.
  • the semi-primary consists of the serialization of the turns S5, S6, S9, S7 and S8 on the one hand, and the paralleling of the turn S10 with the turn S5 on the other hand.
  • the access terminals of the semi-primary are constituted by the terminal 7 brought to the fixed potential and the terminal 1 brought to the variable potential.
  • Terminals 2 and 8 shown on plate S5 are not connected. When two printed circuits are associated, it allows simplified connections to be made.
  • FIG 6 there are shown two of the fourteen layers of the printed circuit marked (100) and (101).
  • the etched copper surfaces (102) and (103) are opposite and insulated from each other by a prepreg insulator (104).
  • the design of the copper has been optimized so that two edges, for example (105) and (106), never coincide. This arrangement makes it possible to reduce the thickness of the prepeg while avoiding the risks of shearing thereof during pressing of the printed circuit. The thickness of the transformer is thus minimized and the coupling between primary and secondary is improved.
  • FIG. 7 there is shown an electrical diagram of a transformer according to the invention.
  • the semi-primary (44) or (45) is associated with the semi-secondary (46) or (47) in the same printed circuit described in FIG. 5.
  • the example shows that by combining two printed circuits, a transformer can be produced for a Push-Pull assembly.
  • the common points (49) and (50) or (53) and (54) common are joined to the primary or secondary fixed potential.
  • Points (48) and (51) or (52) and (55) are joined to the primary or secondary variable potential.
  • the phase match is represented by four dots. The possibility of easy series or parallel connection of the turns offers a large number of possible combinations as well as modular power.
  • FIG. 8 a complete transformer is shown fulfilling the functions described in the diagram in FIG. 7
  • Two identical layers (56) and (57) each comprising a semi-primary and a semi-secondary are associated by two rows of studs ( 58) and (59).
  • One layer is mounted with its upper side up, the other layer having directed it down. In this way, the two semi-secondary are opposite.
  • a free space (60) between the two layers of printed circuits (56) and (57) allows better cooling by circulation of a cooling fluid. The size of this space can vary depending on the speed and the nature of the heat transfer fluid available to optimize cooling.
  • the transformer is completed by a magnetic circuit (61), a core (62) of which dips into the central windows of two layers.
  • the magnetic circuit consists of a core (62) mounted in the middle of a closed part (63). The assembly is cut by the median plane (64) so as to allow mounting.
  • FIG 9 there is shown the drawing of an output pad.
  • This part fulfills 3 functions: . the height of the cylinder (65) makes it possible to fix the spacing between the two layers of printed circuits for the passage of the coolant; . the cylinder (66) emerges from the upper printed circuit layer through a terminal hole and allows the improvement of the cooling by draining in the external ambient flow the calories dissipated in the heart of the printed circuit; . the cylinder (67), which makes the connection with the homologous terminal of the lower layer, has a sufficient height to allow connection to the printed circuit constituting the power supply, when the latter is mounted on a printed circuit.
  • FIG. 10 two layers of printed circuits (66) and (69) have been shown as described above, each comprising a semi-primary and a semi-secondary with strong coupling.
  • coils of cut metal (70, 71, 72, 73) having a thickness greater than a layer of printed circuits are added.
  • the strong coupling is preserved thanks to the secondary turns contained in the printed circuits (68) and (69).
  • Insulating parts (74) and (75) make it possible to isolate the cut coils closest to the magnetic circuit (76) and (77) relative to the latter.
  • the isolation between the printed circuits (68) and (69) and the cut turns (70-73) is ensured by the closing layer of the printed circuits.
  • the positioning of the cut turns (70-73) is ensured by the studs (78) as described in FIG. 9.
  • the size of the interior (or windows) (79) and exterior (80) cuts of the layers (68-74) is calculated in such a way as to insulate the passage of the magnetic circuit.
  • the stacked layers (68) and (69) are all identical and can be mounted in two possible directions depending on the configuration imposed by the electrical diagram.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Dc-Dc Converters (AREA)
EP19880401135 1987-05-15 1988-05-10 Transformator mit starker Kopplung für Speisekreis mit Zerhacker und Speisekreis mit solchem Transformator Expired - Lifetime EP0291403B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706835A FR2615319B1 (fr) 1987-05-15 1987-05-15 Transformateur a fort couplage adapte a un circuit d'alimentation a decoupage et circuit d'alimentation a decoupage comportant un tel transformateur
FR8706835 1987-05-15

Publications (2)

Publication Number Publication Date
EP0291403A1 true EP0291403A1 (de) 1988-11-17
EP0291403B1 EP0291403B1 (de) 1993-01-27

Family

ID=9351129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880401135 Expired - Lifetime EP0291403B1 (de) 1987-05-15 1988-05-10 Transformator mit starker Kopplung für Speisekreis mit Zerhacker und Speisekreis mit solchem Transformator

Country Status (7)

Country Link
US (1) US4937729A (de)
EP (1) EP0291403B1 (de)
JP (1) JPH0795494B2 (de)
DE (1) DE3877817T2 (de)
ES (1) ES2038773T3 (de)
FR (1) FR2615319B1 (de)
WO (1) WO1988009042A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122796A1 (de) * 1991-07-10 1993-01-21 Abb Patent Gmbh Induktives bauelement und verfahren zu seiner herstellung
EP0698896A1 (de) * 1994-08-24 1996-02-28 Yokogawa Electric Corporation Gedruckte Spule
EP0771012A3 (de) * 1994-08-24 1998-02-25 Yokogawa Electric Corporation Transformator mit gedruckten Spulen
EP0961303A2 (de) * 1998-05-26 1999-12-01 Artesyn Technologies Transformatoranordnung
WO2000011687A1 (en) * 1998-08-21 2000-03-02 Nucleus Ecopower Limited Planar transformer
EP1018754A1 (de) * 1999-01-05 2000-07-12 Deutsche Thomson-Brandt Gmbh Dioden-Split-Hochspannungstransformator
WO2001022446A1 (en) * 1999-09-22 2001-03-29 Ericsson, Inc. Split inductor with fractional turn of each winding and pcb including same
WO2001091142A1 (en) * 2000-05-19 2001-11-29 Pulse Engineering, Inc. Multi-layer, multi-functioning printed circuit board
CN107112112A (zh) * 2015-01-20 2017-08-29 株式会社村田制作所 线圈部件

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US5184103A (en) * 1987-05-15 1993-02-02 Bull, S.A. High coupling transformer adapted to a chopping supply circuit
WO1991015861A1 (en) * 1990-03-30 1991-10-17 Multisource Technology Corporation Low-profile planar transformer for use in off-line switching power supplies
DE69121043D1 (de) * 1990-10-18 1996-08-29 Valor Electronics Inc Nicht-gekoppelte integrierte magnetische Struktur
US5166965A (en) * 1991-04-11 1992-11-24 Varian Associates, Inc. High voltage dc source including magnetic flux pole and multiple stacked ac to dc converter stages with planar coils
US5475606A (en) * 1993-03-05 1995-12-12 International Business Machines Corporation Faraday cage for a printed circuit card
TW436823B (en) * 1994-06-29 2001-05-28 Yokogawa Electric Corp Prited coil type transformer
GB9424349D0 (en) 1994-12-02 1995-01-18 Measurement Tech Ltd Transformers
US7269034B2 (en) 1997-01-24 2007-09-11 Synqor, Inc. High efficiency power converter
US6608545B2 (en) 2000-01-24 2003-08-19 Nucleus Ecopower Limited Planar transformer
US7932799B2 (en) * 2004-09-24 2011-04-26 Koninklijke Philips Electronics N.V. Transformer
KR101414779B1 (ko) * 2010-10-20 2014-07-03 한국전자통신연구원 무선 전력 전송 장치
US10199950B1 (en) 2013-07-02 2019-02-05 Vlt, Inc. Power distribution architecture with series-connected bus converter
KR102317743B1 (ko) * 2015-07-21 2021-10-27 삼성전자 주식회사 전자기 유도 소자, 이를 구비한 전원공급장치 및 디스플레이장치
JP6478434B2 (ja) * 2015-11-17 2019-03-06 新電元工業株式会社 スイッチング電源装置
GB201622186D0 (en) * 2016-12-23 2017-02-08 Weatherford Uk Ltd Antenna for downhole communication
CN107424794A (zh) * 2017-08-17 2017-12-01 广州金升阳科技有限公司 一种变压器
EP3576113B1 (de) * 2018-05-31 2021-01-06 Salcomp Oyj Planarer transformator und verfahren zur abschirmung von windungen in einem planaren transformator
JP2020109807A (ja) * 2019-01-07 2020-07-16 スミダコーポレーション株式会社 平面型トランス
US10886857B1 (en) * 2019-07-31 2021-01-05 Ralph R. Karsten Inhibiting noise coupling across isolated power supplies

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FR981390A (fr) * 1948-12-31 1951-05-25 Procédé pour la constitution de bobinages électriques par empilage d'éléments préfabriqués
FR1580316A (de) * 1968-05-27 1969-09-05
US3833872A (en) * 1972-06-13 1974-09-03 I Marcus Microminiature monolithic ferroceramic transformer

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FR981390A (fr) * 1948-12-31 1951-05-25 Procédé pour la constitution de bobinages électriques par empilage d'éléments préfabriqués
FR1580316A (de) * 1968-05-27 1969-09-05
US3833872A (en) * 1972-06-13 1974-09-03 I Marcus Microminiature monolithic ferroceramic transformer

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122796A1 (de) * 1991-07-10 1993-01-21 Abb Patent Gmbh Induktives bauelement und verfahren zu seiner herstellung
EP0698896A1 (de) * 1994-08-24 1996-02-28 Yokogawa Electric Corporation Gedruckte Spule
EP0807941A2 (de) * 1994-08-24 1997-11-19 Yokogawa Electric Corporation Gedruckte Spule
EP0807941A3 (de) * 1994-08-24 1998-02-25 Yokogawa Electric Corporation Gedruckte Spule
EP0771012A3 (de) * 1994-08-24 1998-02-25 Yokogawa Electric Corporation Transformator mit gedruckten Spulen
EP0961303A3 (de) * 1998-05-26 2000-05-17 Artesyn Technologies Transformatoranordnung
EP0961303A2 (de) * 1998-05-26 1999-12-01 Artesyn Technologies Transformatoranordnung
WO2000011687A1 (en) * 1998-08-21 2000-03-02 Nucleus Ecopower Limited Planar transformer
EP1018754A1 (de) * 1999-01-05 2000-07-12 Deutsche Thomson-Brandt Gmbh Dioden-Split-Hochspannungstransformator
WO2001022446A1 (en) * 1999-09-22 2001-03-29 Ericsson, Inc. Split inductor with fractional turn of each winding and pcb including same
US6307458B1 (en) 1999-09-22 2001-10-23 Ericsson Inc. Split inductor with fractional turn of each winding and PCB including same
KR100754055B1 (ko) 1999-09-22 2007-08-31 에릭슨 인크. 각 권선의 부분적인 턴을 갖는 분할 인덕터 및 이러한 인덕터를 포함하는 ｐｃｂ
WO2001091142A1 (en) * 2000-05-19 2001-11-29 Pulse Engineering, Inc. Multi-layer, multi-functioning printed circuit board
KR100779238B1 (ko) * 2000-05-19 2007-11-23 펄스 엔지니어링, 인코포레이티드 전기적 소자 및 이의 제조 방법
CN107112112A (zh) * 2015-01-20 2017-08-29 株式会社村田制作所 线圈部件

Also Published As

Publication number Publication date
FR2615319B1 (fr) 1989-07-07
FR2615319A1 (fr) 1988-11-18
DE3877817D1 (de) 1993-03-11
WO1988009042A1 (fr) 1988-11-17
US4937729A (en) 1990-06-26
JPH0795494B2 (ja) 1995-10-11
DE3877817T2 (de) 1993-05-27
ES2038773T3 (es) 1993-08-01
EP0291403B1 (de) 1993-01-27
JPH01503264A (ja) 1989-11-02

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