Transformer PCB topological structure of multiplexed output flyback converter
By using multi-layer printed circuit boards and a distributed magnetic core structure, the problems of large size and thickness of traditional transformers have been solved, achieving miniaturization and cost reduction of transformers, and improving efficiency.
Patent Information
- Application Number
- CN202423165469.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-22
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-22
AI Technical Summary
Traditional planar transformers are large, thick, and heavy, resulting in high manufacturing costs and low efficiency, especially in multi-output flyback converters where the number of winding turns and PCB winding layers are excessive.
It adopts a multi-layer printed circuit board and distributed magnetic core structure. The primary and secondary windings are wound through a six-layer PCB board. The number of turns is electrically connected in series or parallel through through-holes. The magnetic core is arranged in two parts, upper and lower, which reduces the PCB area and number of layers occupied by the winding.
This results in smaller transformer size, reduced thickness, and lighter weight, thereby lowering the layout area and manufacturing cost of planar transformers while improving efficiency.
Smart Images
Figure CN223566410U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to transformer technical field, concretely is a kind of transformer PCB topological structure of multi-output flyback converter. BACKGROUND
[0002] Traditional planar transformer, a magnetic core, a winding is laid one layer of printed board, 12 windings on printed board need to use 12 layers of PCB board to complete the spiral wiring layout of 12 windings, the winding of primary coil occupies the maximum area of planar transformer, determines the size of planar transformer;With the development of transformer design to light, thin, small direction, conventional planar transformer uses single layer or multi-layer PCB board, copper foil and so on Material is made into an independent transformer, then the transformer is welded on the printed board of product, with large size, high height, vibration is not firm, and the planar transformer design of flyback converter adopts many turns of winding, PCB winding turns and layer number are too much, and the production cost is high and the efficiency is low. SUMMARY
[0003] The utility model aims at providing a kind of transformer PCB topological structure of multi-output flyback converter, to solve the problems raised in the above background technology.
[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of transformer PCB topological structure of multi-output flyback converter, including printed circuit board, primary winding, secondary winding, the magnetic core of being arranged above printed circuit board, the magnetic core of being arranged below printed circuit board, and the primary winding of being evenly laid on the magnetic core and the magnetic core, the printed circuit board uses the six layers spiral printed conductor of first layer, second layer, third layer, fourth layer, fifth layer, sixth layer and is insulated by board material between each layer, the planar transformer of printed circuit board is hollowed out for installing the magnetic core and the magnetic core on the middle, the primary winding and secondary winding are made by six layers PCB board, and the turns between winding are connected by hole to realize electrical connection in series or parallel mode.
[0005] Preferably, the 24 turns of coil of primary winding are evenly laid on the magnetic core and the magnetic core, the primary winding on the magnetic core is a primary coil, the primary winding on the magnetic core is a secondary coil, six primary coils are laid on the first layer, six secondary coils are laid on the sixth layer, and the coil of first layer and sixth layer is overlapped and wound and is connected in series by an electrical connection hole.
[0006] Preferably, the second layer is provided with a primary winding, the third layer is provided with a secondary winding, the fourth layer is provided with a third secondary winding, and the fifth layer is provided with a fourth secondary winding.
[0007] The utility model discloses a beneficial effect is: the utility model has the characteristics of small size, thickness reduction, light weight, adopts printed circuit board manufacturing process to form spiral coil on multilayer board, only needs to install the magnetic core, has saved the winding framework, can divide the primary winding turns of transformer equally, the secondary winding average distribution layout is realized while the original technical index, reaches the effect of reducing the height of planar transformer, reduces the size, effectively reduces the layout area of planar transformer and reduces the number of layers required by PCB layout. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 It is transformer PCB topological structure diagram of multiway output flyback converter of the utility model;
[0009] Figure 2 It is transformer PCB principle topological graph of multiway output flyback converter of the utility model.
[0010] In the drawing: 1 first layer, 2 second layer, 3 third layer, 4 fourth layer, 5 fifth layer, 6 sixth layer, 101 primary coil, 102 secondary winding, 103 secondary winding, 104 secondary winding, 105 secondary winding, 106 secondary winding, 7 magnetic core, 8 magnetic core. DETAILED DESCRIPTION
[0011] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of protection of the utility model.
[0012] Please refer to Figures 1-2It is a kind of technical scheme that the utility model provides a kind of transformer PCB topology structure of multi-output flyback converter, including printed circuit board, primary winding, secondary winding, the magnetic core 7 of being arranged above printed circuit board, the magnetic core 8 of being arranged below printed circuit board and the primary winding of being evenly laid on the magnetic core 7 and the magnetic core 8, printed circuit board adopts the six layers spiral printed conductor of first layer 1, second layer 2, third layer 3, fourth layer 4, fifth layer 5, sixth layer 6 and the insulation between each layer by board material, the planar transformer of printed circuit board is hollowed out for installing the magnetic core 7 and the magnetic core 8 on, primary winding and secondary winding are made by six layers PCB board winding, and the number of turns between winding is realized electrical connection by the way of series or parallel by hole;Wherein, the 24 turns coil of primary winding is evenly laid on the magnetic core 7 and the magnetic core 8, the primary winding on the magnetic core 7 is a primary coil 101, the primary winding on the magnetic core 8 is a secondary coil 106, six primary coils 101 are arranged in first layer 1, six secondary coils 106 are arranged in sixth layer 6, and the coil of first layer 1 and sixth layer 6 is overlapped winding and realizes electrical connection series by a through hole;Second layer 2 is provided with a primary winding 102, third layer 3 is provided with a secondary winding 103, fourth layer 4 is provided with a third secondary winding 104, and fifth layer 5 is provided with a fourth secondary winding 105.
[0013] In combination Figure 1 With Figure 2As shown, the transformer PCB topology of the multi-output flyback converter, first, the primary coil 24 turns of coil is evenly laid on two magnetic cores, the magnetic cores are symmetrically distributed, the first layer 1 of the first magnetic core 7 is arranged with six coils, the sixth layer 6 is arranged with six coils, the first layer 1 and the sixth layer 6 are overlapped and wound and are electrically connected in series through a through hole; the first layer 1 of the second magnetic core 8 is arranged with six primary coils, the sixth layer 6 is arranged with six primary coils, the first layer 1 and the sixth layer 6 are overlapped and wound and are electrically connected in series through a through hole, the 24 turns of primary winding are connected in series through the printed conductors of the sixth layer 6 of the first magnetic core 7 and the second magnetic core 8, thereby realizing the winding of the 24 turns of primary winding; secondly, the secondary winding is evenly distributed in the middle of the upper and lower two magnetic cores; the second layer 2 of the first magnetic core is arranged with two secondary windings: (22-22) one turn, (26-26) one turn; the second magnetic core is arranged with two secondary windings (15-16) one turn, (17-18) one turn; the third layer 3 of the first magnetic core is arranged with two secondary windings (21-22) one turn, (25-26) one turn, and the second magnetic core is arranged with two secondary windings (11-12) one turn, (13-14) one turn; the fourth layer 4 of the first magnetic core is arranged with one secondary winding (27-28) two turns, and the second magnetic core is arranged with one secondary winding (7-8) three turns; the fifth layer of the first magnetic core is arranged with one secondary winding (9-10) one turn, (29-30) three turns, and the second magnetic core is arranged with one secondary winding (3-4) three turns, (5-6) one turn; the two turns of the winding (21-22) realize electrical connection at point twenty-two through a through hole, and the first layer (22-22) one turn and the third layer (21-22) one turn of the second layer are electrically connected at point twenty-two; the two turns of the winding (25-26) realize electrical connection at point twenty-six through a through hole, and the second layer (26-26) one turn and the third layer (25-26) one turn are electrically connected at point twenty-six; the three turns of the printed circuit board (7-8) / / (29-30) / / (9-10) are connected to point twenty-nine through the second layer 2 printed conductor at point seven of the fourth layer 4 (7-8) three turns, and are connected to the fifth layer (29-30) three turns / (9-10) one turn at point twenty-nine through a through hole; compared with the traditional planar transformer which needs to wind 24 turns of coil on one magnetic core, 24 turns of coil need to be wound, the coil radius after winding is 9mm, and the coil area is reduced by one half in the embodiment of the two magnetic cores distributed with six coils on each layer.
[0014] In summary, the transformer PCB topology of the multi-output flyback converter, the planar transformer can reduce half of the PCB area compared with the traditional planar transformer architecture, and the number of printed board layers is reduced by at most half, the planar transformer adopts a distributed magnetic core, which divides the transformer magnetic core into two, the primary winding and the secondary winding are wound through the six-layer PCB, and the turns between the windings are connected in series or parallel through the through holes.
[0015] The technical features of the above embodiments can be combined in any manner, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.
[0016] The above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent; it should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application; in the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction between two elements; among them, the detachable mounting method has many kinds, for example, it can be connected through the cooperation of plug-in and buckle, and for example, it can be connected through bolt connection, etc.
[0017] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A transformer PCB topology for a multi-output flyback converter, characterized by: The printed circuit board, the primary winding, the secondary winding, the first magnetic core arranged above the printed circuit board, the second magnetic core arranged below the printed circuit board, and the primary winding evenly arranged on the first magnetic core and the second magnetic core, the printed circuit board adopts six layers of spiral printed conductors, and the layers are insulated by the board material, the planar transformer of the printed circuit board is hollowed in the middle for mounting the first magnetic core and the second magnetic core, and the primary winding and the secondary winding are wound by the six layers of PCB boards, and the number of turns between the windings is connected in series or parallel through the through hole.
2. The transformer PCB topology of a multi-output flyback converter according to claim 1, wherein: The 24-turn coil of the primary winding is evenly arranged on the first magnetic core and the second magnetic core, the primary winding on the first magnetic core is a first primary coil, the primary winding on the second magnetic core is a second primary coil, six first primary coils are arranged on the first layer, and six second primary coils are arranged on the sixth layer, and the coils on the first layer and the sixth layer are wound in overlap and connected in series through a through hole.
3. The transformer PCB topology of a multi-output flyback converter according to claim 1, wherein: The second layer is arranged with a first secondary winding, the third layer is arranged with a second secondary winding, the fourth layer is arranged with a third secondary winding, and the fifth layer is arranged with a fourth secondary winding.