Planar transformer with multiplexed output

Abstract

The utility model provides a multi-output planar transformer, which comprises a magnetic core assembly and a planar coil winding, the planar coil winding comprises a plurality of PCBs (printed circuit boards), the magnetic core assembly consists of a sheet-shaped upper magnetic core and an E-shaped lower magnetic core which are arranged up and down and clung to each other, and a convex part is arranged in the middle of the E-shaped lower magnetic core. An interval for accommodating a PCB (Printed Circuit Board) is formed between the E-shaped lower magnetic core and the sheet-shaped upper magnetic core; a plurality of PCBs (printed circuit boards) are stacked up and down in the interval, a hole is formed in the middle of each PCB, and the holes in the PCBs are vertically opposite to each other, so that the planar coil winding can be integrally clamped on the convex part to limit transverse swinging of the planar coil winding, and the planar coil winding is clamped between the sheet-shaped upper magnetic core and the E-shaped lower magnetic core to limit vertical displacement. The utility model aims to provide the multi-output planar transformer capable of adjusting the input and output voltage ratio.

Description

Technical Field

[0001] The utility model relates to the technical field of planar transformers, and particularly relates to a multi-output planar transformer. Background Technique

[0002] A transformer is a device that uses electromagnetic mutual induction to transform voltage, current, and impedance. A transformer is a device that uses the principle of electromagnetic induction to change alternating voltage. Its main components are a primary coil, a secondary coil, and an iron core (magnetic core). The primary coil and the secondary coil are respectively wound on both sides of the iron core (magnetic core), and it is inconvenient to adjust the number of coil windings. For this reason, the applicant of the present invention created this patented technology. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a multi-output planar transformer that can adjust the input-output voltage ratio.

[0004] To achieve the above object, the utility model provides the following technical solution: A multi-output planar transformer includes a magnetic core assembly and a planar coil winding. The planar coil winding includes a plurality of PCB boards with internally printed coils. The magnetic core assembly is composed of a sheet-shaped upper magnetic core and an E-shaped lower magnetic core that are arranged up and down and tightly fitted. The E-shaped lower magnetic core has a protruding part in the middle. An interval for accommodating the PCB board is formed between the E-shaped lower magnetic core and the sheet-shaped upper magnetic core. A plurality of the PCB boards are stacked up and down in the interval. Each PCB board has a hole in the middle, and the holes on the plurality of PCB boards are arranged vertically and oppositely up and down, so that the planar coil winding can be integrally clamped on the protruding part to limit the lateral swing of the planar coil winding. The planar coil winding is clamped between the sheet-shaped upper magnetic core and the E-shaped lower magnetic core to limit the up and down displacement.

[0005] Further, the cross-section of the protruding part is square, and the hole is a square hole.

[0006] Further, the sheet-shaped upper magnetic core is placed flat on the E-shaped lower magnetic core, and the periphery of the sheet-shaped upper magnetic core and the E-shaped lower magnetic core is packed into a whole with tape.

[0007] Further, partition boards are respectively arranged between the plurality of PCB boards and between the PCB board and the planar magnetic core assembly. The front and rear ends of the plurality of partition boards respectively extend out of the magnetic core assembly. The front and rear ends of the planar coil winding respectively extend out of the magnetic core assembly. The front and rear ends of each upper PCB board of the planar coil winding are respectively provided with a solder joint and a through hole one. The solder joint is a hole-shaped solder joint. The partition board is provided with a plurality of through holes two. The hole-shaped solder joints and the through hole one on each PCB board are respectively arranged vertically and oppositely with the plurality of through holes two on the partition board to form a plurality of pin insertion channels penetrating the planar coil winding.

[0008] Further, it further includes an auxiliary insulating rubber strip. When there is a spacing interval between the upper end of the planar coil winding and the sheet-shaped upper magnetic core, the auxiliary insulating rubber strip is arranged in the spacing interval to limit the up and down displacement of the planar coil winding.

[0009] Compared with the prior art, the technical solution of the present application has the following beneficial effects:

[0010] 1. Multiple PCB boards are stacked up and down in the interval, and the winding coil can be adjusted by increasing or decreasing the number of PCB boards.

[0011] 2. The PCB boards have the same outer shape size and are stacked up and down. The structure is simple and the up and down spacing is small, which is beneficial to reducing the volume of the transformer.

[0012] 3. The sheet-shaped upper magnetic core is placed flat on the E-shaped lower magnetic core, and the periphery of the sheet-shaped upper magnetic core and the E-shaped lower magnetic core is packaged into a whole with tape. The structure is simple and the connection is firm.

[0013] 4. When there is a spacing interval between the upper end of the planar coil winding and the sheet-shaped upper magnetic core, the auxiliary insulating rubber strip is arranged in the spacing interval to limit the up and down displacement of the planar coil winding, which is convenient for fixing the planar coil winding when reducing the PCB boards. The structure is simple and the fixing is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is an exploded view of the structure of the present utility model;

[0016] Figure 3 is an exploded side view of the structure of the present utility model.

[0017] In the figure: 11, upper magnetic core; 12, lower magnetic core; 2, partition; 21, through hole two; 3, PCB board; 31, solder joint; 32, through hole one; 4, rubber strip; 5, tape; 6, pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0019] Please refer to Figures 1 - 3 , a multi-output planar transformer in this embodiment includes a magnetic core assembly and a planar coil winding.

[0020] The planar coil winding includes multiple PCB boards 3 with internal printed coils. The multiple PCB boards 3 are divided into input winding printed coil PCB boards 3 and output winding printed coil PCB boards 3.

[0021] The magnetic core assembly is composed of a sheet-shaped upper magnetic core 11 and an E-shaped lower magnetic core 12 which are arranged up and down and tightly fit together. The E-shaped lower magnetic core 12 has a convex part in the middle, and the cross-section of the convex part is square. An interval for accommodating the PCB board 3 is formed between the E-shaped lower magnetic core 12 and the sheet-shaped upper magnetic core 11. The sheet-shaped upper magnetic core 11 is placed flat on the E-shaped lower magnetic core 12, and the periphery of the sheet-shaped upper magnetic core 11 and the E-shaped lower magnetic core 12 is packaged into a whole with a tape 5.

[0022] For convenient assembly, multiple PCB boards 3 are stacked up and down in the interval. Square holes are provided in the middle of each PCB board 3, and the openings on multiple PCB boards 3 are arranged vertically and oppositely up and down, so that the planar coil winding can be integrally clamped on the convex part to limit the lateral swing of the planar coil winding, and the planar coil winding is clamped between the sheet-shaped upper magnetic core 11 and the E-shaped lower magnetic core 12 to limit the up and down displacement.

[0023] To improve the voltage transformation performance, partitions 2 are respectively arranged between multiple PCB boards 3 and between the PCB board 3 and the planar magnetic core assembly. The front and rear ends of multiple partitions 2 respectively extend out of the magnetic core assembly. The partition 2 is used to separate different winding layers, plays an insulating role in each PCB board 3, can improve the reliability and ensure the electrical safety at the same time.

[0024] To facilitate the connection of the pins 6, in the embodiment of the present application, the front and rear ends of the planar transformer protrude outwards and are welded with the pins 6. The specific structure is as follows:

[0025] The front and rear ends of the planar coil winding respectively extend out of the magnetic core assembly. The front and rear ends of each upper PCB board 3 of the planar coil winding are respectively provided with a solder joint 31 and a through hole one 32. The solder joint 31 is a hole-shaped solder joint 31. Multiple through holes two 21 are provided on the partition 2. The hole-shaped solder joints 31 and the through holes one 32 on each PCB board 3 are respectively arranged vertically and oppositely with multiple through holes two 21 on the partition 2 to form multiple insertion channels for the pins 6 penetrating through the planar coil winding.

[0026] As shown in the embodiment, there are 4 PCB boards 3 and 5 partitions 2. Solder joints 31 are respectively arranged at the front and rear ends of each PCB board 3. Multiple through holes one 32 are respectively arranged at the front and rear ends of each PCB board 3. Three through holes two 21 are arranged at the front end of each partition 2, and seven through holes two 21 are arranged at the rear end of each partition 2. Three insertion channels for the pins 6 are formed at the front end of the planar coil winding, and seven insertion channels for the pins 6 are formed at the rear end of the planar coil winding. There are ten pins 6, and the ten pins 6 are inserted into the ten insertion channels for the pins 6 one by one.

[0027] During operation, one or more input pins 6 are connected to an input power supply to form a plurality of input windings, and one or more output pins 6 are connected to an output terminal to form a plurality of output windings. When the number of PCB boards 3 is fixed, by adjusting the number of PCB boards 3 on the input winding and the number of PCB boards 3 on the output winding, the adjustment of the input-output voltage ratio can be achieved. For example, one PCB board 3 is used as the input winding, and the remaining three PCB boards 3 are used as the output windings. It is also possible that two PCB boards 3 are used as the input winding, and the remaining two PCB boards 3 are used as the output windings. It is also possible that three PCB boards 3 are used as the input winding, and the remaining one PCB board 3 is used as the output winding.

[0028] In addition to the above embodiments, the adjustment of the input-output voltage ratio can be achieved by increasing or decreasing the number of PCB boards 3.

[0029] In the embodiment of the present application, as shown in the figure, there are 3 PCB boards 3 and 4 partition plates 2. Since there is one less PCB board 3 and one less partition plate 2, when the planar coil winding composed of 3 PCB boards 3 and 4 partition plates 2 is placed in the interval for accommodating the PCB boards 3, and there is an interval between the upper end of the planar coil winding and the sheet-type upper magnetic core 11, an auxiliary insulating rubber strip 4 is arranged in the interval to limit the up and down displacement of the planar coil winding. The thickness of the auxiliary insulating rubber strip 4 is greater than or equal to the superposed thickness of one PCB board 3 and one partition plate 2. The advantage of such a structural design is that the adjustment of the input-output voltage ratio can be achieved by adjusting the number of PCB boards 3. The number of PCB boards 3 can be adjusted according to the actual situation.

[0030] In the present application, a plurality of PCB boards 3 achieve different electrical functions by designing the input-output coil paths, thereby improving the electrical performance. At the same time, the input winding printed coil PCB board 3 and the output winding printed coil PCB board 3 are stacked, reducing the overall size and facilitating the adjustment of the winding parameters.

[0031] In the present application, the PCB board 3 is welded to the pins 6 to play a role in supporting and fixing the PCB board 3, so that the stacked PCB boards 3 and partition plates 2 can be firmly connected and fixed to each pin 6 to form a whole.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-output planar transformer, comprising a magnetic core assembly and a planar coil winding, characterized in that: The planar coil winding includes a PCB board (3) with multiple internally printed coils. The magnetic core assembly is composed of a sheet-shaped upper magnetic core (11) and an E-shaped lower magnetic core (12) which are arranged up and down and tightly fitted together. The E-shaped lower magnetic core (12) has a convex portion in the middle. An interval for accommodating the PCB board (3) is formed between the E-shaped lower magnetic core (12) and the sheet-shaped upper magnetic core (11). A plurality of the PCB boards (3) are stacked up and down in the interval. Each PCB board (3) has an opening in the middle. The openings on the plurality of PCB boards (3) are arranged vertically opposite to each other, so that the planar coil winding can be integrally clamped on the convex portion to limit the lateral swing of the planar coil winding. The planar coil winding is clamped between the sheet-shaped upper magnetic core (11) and the E-shaped lower magnetic core (12) to limit the up and down displacement.

2. The planar transformer with multiple outputs according to claim 1, wherein: The cross-section of the convex portion is square, and the opening is a square hole.

3. A multi-output planar transformer according to claim 1, characterized in that: The sheet-shaped upper magnetic core (11) is placed flat on the E-shaped lower magnetic core (12), and the periphery of the sheet-shaped upper magnetic core (11) and the E-shaped lower magnetic core (12) is packaged into a whole with a tape (5).

4. A multi-output planar transformer according to claim 1, characterized in that: Partition plates (2) are respectively arranged between the plurality of PCB boards (3) and between the PCB board (3) and the planar magnetic core assembly. The front and rear ends of the plurality of partition plates (2) respectively extend out of the magnetic core assembly. The front and rear ends of the planar coil winding respectively extend out of the magnetic core assembly. Solder joints (31) and through holes one (32) are respectively arranged at the front and rear ends of each upper PCB board (3) of the planar coil winding. The solder joints (31) are hole-shaped solder joints (31). A plurality of through holes two (21) are arranged on the partition plates (2). The hole-shaped solder joints (31) and the through holes one (32) on each PCB board (3) are respectively arranged vertically opposite to the plurality of through holes two (21) on the partition plates (2) to form insertion channels for a plurality of pins (6) penetrating through the planar coil winding.

5. A multi-output planar transformer according to claim 1, characterized in that: An auxiliary insulating rubber strip (4) is further included. When there is an interval between the upper end of the planar coil winding and the sheet-shaped upper magnetic core (11), the auxiliary insulating rubber strip (4) is arranged in the interval to limit the up and down displacement of the planar coil winding.

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