SMD flyback transformer

Abstract

The utility model provides an SMD flyback transformer which comprises a framework, the framework is provided with a cavity for containing a winding assembly, the winding assembly is arranged in the cavity, a magnetic core is arranged outside the framework, pins are arranged at the bottom of the framework, and the pins and the framework are integrally formed. The winding assembly comprises a primary winding and a secondary winding; the primary winding is arranged in the cavity of the framework; the secondary winding is provided with five layers and sequentially comprises a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding and a fifth secondary winding; the first secondary winding, the fifth secondary winding and the primary winding are arranged on the same side, and the second secondary winding, the third secondary winding, the fourth secondary winding and the primary winding are arranged on different sides. According to the SMD flyback transformer, on the premise that the overall performance of the transformer is not affected, the size of the transformer is reduced to the maximum extent, and the use requirement of the transformer in an SMD paster environment is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and in particular relates to an SMD flyback transformer. Background Art

[0002] The flyback transformer is also called single-ended flyback or Buck-Boost converter. It is named because its output end obtains energy when the primary winding is disconnected from the power supply; the flyback converter is popular among development engineers for its simple circuit structure and low cost.

[0003] Flyback transformers are suitable for low-power power supplies and various power adapters. However, the difficulty of the flyback converter is the design of the transformer, because the input voltage range is wide, especially under low input voltage and full load conditions, the transformer will work in continuous current mode, and under high input voltage and light load conditions, the transformer will work in discontinuous current mode. Summary of the invention

[0004] The utility model aims to overcome the deficiencies in the prior art and provides an SMD flyback transformer, which improves the working efficiency of the transformer under the premise of extremely small volume by using an EP13 skeleton.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the utility model is:

[0006] An SMD flyback transformer, comprising a frame, the frame having a cavity for placing a winding assembly, the winding assembly being arranged in the cavity, a magnetic core being arranged outside the frame, a pin being arranged at the bottom of the frame, and the pin being integrally formed with the frame;

[0007] The winding assembly includes a primary winding and a secondary winding; the primary winding is arranged in the cavity of the frame;

[0008] The secondary winding is provided with five layers, including a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, and a fifth secondary winding in sequence; the first secondary winding and the fifth secondary winding are arranged on the same side as the primary winding, and the second secondary winding, the third secondary winding, and the fourth secondary winding are arranged on a different side from the primary winding.

[0009] Preferably, in the SMD flyback transformer, the primary winding is arranged on the bottom surface of the skeleton cavity, and side bands are arranged on both sides of the primary winding.

[0010] Preferably, in the SMD flyback transformer, the primary winding is wound clockwise in the skeleton winding area between the pins through the second copper wire, the first secondary winding, the second secondary winding and the fourth secondary winding are wound counterclockwise in the skeleton winding area between the pins through the first copper wire; the third secondary winding and the fifth secondary winding are wound clockwise in the winding area of ​​the skeleton through the first copper wire.

[0011] Preferably, in the SMD flyback transformer, the first copper wire and the second copper wire are both of FIW6 grade.

[0012] Preferably, in the SMD flyback transformer, epoxy glue and silicone glue are sequentially arranged between the skeleton and the magnetic core from bottom to top.

[0013] Preferably, in the SMD flyback transformer, a tape layer is provided between the primary winding and the secondary winding.

[0014] Preferably, in the SMD flyback transformer, the magnetic core comprises two half shells, one of which is provided with a first connecting portion, and the other is provided with a second connecting portion, the two half shells are detachably connected through the first connecting portion and the second connecting portion to form a cavity; the skeleton part is arranged in the cavity of the magnetic core.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0016] The SMD flyback transformer of the utility model reduces the size of the transformer to the greatest extent without affecting the overall performance of the transformer, thereby meeting the use requirements of the transformer in an SMD patch environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the SMD flyback transformer of the utility model.

[0018] Figure 2 It is an exploded view of the SMD flyback transformer of the present utility model.

[0019] Figure 3 The utility model is a circuit diagram of the SMD flyback transformer. DETAILED DESCRIPTION

[0020] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "inside, outside", "up, down", "front, back", etc. are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] like Figure 1-3 , an SMD flyback transformer, comprising a skeleton 1, the skeleton 1 having a cavity for placing a winding assembly, the winding assembly being arranged in the cavity, a magnetic core 2 being arranged outside the skeleton 1, a pin 9 being arranged at the bottom of the skeleton 1, and the pin 9 being integrally formed with the skeleton 1;

[0023] The winding assembly includes a primary winding P1 and a secondary winding; the primary winding P1 is arranged in the cavity of the frame;

[0024] The secondary winding is provided with five layers, including a first secondary winding S1, a second secondary winding S2, a third secondary winding S3, a fourth secondary winding S4, and a fifth secondary winding S5 in sequence; the first secondary winding S1 and the fifth secondary winding S5 are arranged on the same side as the primary winding, and the second secondary winding S2, the third secondary winding S3, and the fourth secondary winding S4 are arranged on a different side from the primary winding P1.

[0025] The primary winding P1 is arranged on the bottom surface of the frame cavity, and side bands 8 are arranged on both sides of the primary winding P1.

[0026] The primary winding P1 is wound clockwise in the winding area of ​​the skeleton 1 between the pins 9 through the second copper wire 7, and the first secondary winding S1, the second secondary winding S2 and the fourth secondary winding S4 are wound counterclockwise in the winding area of ​​the skeleton 1 between the pins 9 through the first copper wire 3; the third secondary winding S3 and the fifth secondary winding S5 are wound clockwise in the winding area of ​​the skeleton 1 through the first copper wire 3.

[0027] The first copper wire 3 and the second copper wire 7 are both FIW6 grade.

[0028] Epoxy glue and silicone glue are arranged between the skeleton 1 and the magnetic core 2 from bottom to top.

[0029] A tape layer 4 is provided between the primary winding and the secondary winding.

[0030] The magnetic core 2 includes two half shells, one of which is provided with a first connecting portion 5 and the other is provided with a second connecting portion 6. The two half shells are detachably connected through the first connecting portion and the second connecting portion to form a cavity; the skeleton 1 is partially arranged in the cavity of the magnetic core 2.

[0031] Preparation process of the utility model:

[0032] Step 1. The frame 1 is a bakelite frame, and the first copper wire 3 is wound around the pin 9 of the frame 1, and is wound counterclockwise around the winding area of ​​the frame 1, and then ends from another pin. After the winding is completed, the first secondary winding S1 is formed, and then wrapped with a high-temperature tape 4;

[0033] Step 2. Wind the first copper wire 3 around the pin 9 of the frame 1, wind it counterclockwise around the winding area of ​​the frame 1, and then end from another pin. After the winding is completed, a second secondary winding S2 is formed, and then wrapped with a high-temperature tape 4;

[0034] Step 3. Place the 1mm side tape 8 on both sides of the frame 1 before winding, wind the second copper wire 7 around the pin of the frame 1, wind it clockwise around the winding area of ​​the frame 1, and then end from the other pin. After winding is completed, the primary winding P1 is formed, and then wrapped with high-temperature tape 4;

[0035] Step 4. The first copper wire 3 is wound around the pin of the frame 1, clockwise around the winding area of ​​the frame 1, and then ends from another pin. After the winding is completed, the fifth secondary winding S5 is formed, and then wrapped with a high-temperature tape 4;

[0036] Step 5. The first copper wire 3 is wound around the pin of the frame 1, clockwise around the winding area of ​​the frame 1, and then ends from another pin. After the winding is completed, a third secondary winding S3 is formed, and then wrapped with a high-temperature tape 4;

[0037] Step 6. The first copper wire 3 is wound around the pin of the frame 1, and then wound counterclockwise around the winding area of ​​the frame 1, and then ends from another pin. After the winding is completed, the fourth secondary winding S4 is formed, and then wrapped with high-temperature tape 4. The magnetic core 2 is installed on the frame 1, and the magnetic core 2 is fixed with 6060 epoxy glue. At the same time, the frame 1 and the magnetic core 2 are fixed with 9661E silicone.

[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An SMD flyback transformer, characterized in that: The invention comprises a frame (1), wherein the frame (1) has a cavity in which a winding assembly can be placed, the winding assembly is arranged in the cavity, a magnetic core (2) is arranged outside the frame (1), a pin (9) is arranged at the bottom of the frame (1), and the pin (9) and the frame (1) are integrally formed; The winding assembly includes a primary winding and a secondary winding; the primary winding is arranged in the cavity of the frame; The secondary winding is provided with five layers, including a first secondary winding, a second secondary winding, a third secondary winding, a fourth secondary winding, and a fifth secondary winding in sequence; the first secondary winding and the fifth secondary winding are arranged on the same side as the primary winding, and the second secondary winding, the third secondary winding, and the fourth secondary winding are arranged on a different side from the primary winding.

2. The SMD flyback transformer according to claim 1, characterized in that: The primary winding is arranged on the bottom surface of the frame cavity, and side bands (8) are arranged on both sides of the primary winding.

3. The SMD flyback transformer according to claim 1, characterized in that: The primary winding is wound clockwise around a winding area of ​​the frame (1) between the pins (9) via a second copper wire (7); the first secondary winding, the second secondary winding and the fourth secondary winding are wound counterclockwise around a winding area of ​​the frame (1) between the pins (9) via a first copper wire (3); and the third secondary winding and the fifth secondary winding are wound clockwise around a winding area of ​​the frame (1) via the first copper wire (3).

4. The SMD flyback transformer according to claim 3, characterized in that: The first copper wire (3) and the second copper wire (7) are both of FIW6 grade.

5. The SMD flyback transformer according to claim 1, characterized in that: Epoxy glue and silicone glue are arranged between the skeleton (1) and the magnetic core (2) in sequence from bottom to top.

6. The SMD flyback transformer according to claim 1, characterized in that: A tape layer (4) is provided between the primary winding and the secondary winding.

7. The SMD flyback transformer according to claim 1, characterized in that: The magnetic core (2) comprises two half shells, one of which is provided with a first connecting portion (5) and the other of which is provided with a second connecting portion (6); the two half shells are detachably connected via the first connecting portion and the second connecting portion to form a cavity; the skeleton (1) is partially provided in the cavity of the magnetic core (2).

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