Flyback transformer

Abstract

The utility model provides a flyback transformer which comprises a framework, the framework is provided with a cavity for placing 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 two layers of primary windings which are 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 second secondary winding and the primary winding are arranged on the same side, and the third secondary winding, the fourth secondary winding, the fifth secondary winding and the primary winding are arranged on different sides. According to the 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 a narrow environment is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and in particular relates to a 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 purpose of the utility model is to overcome the deficiencies in the prior art and provide a flyback transformer to improve the working efficiency of the transformer under the premise of extremely small volume.

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

[0006] A 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, which is arranged in a cavity of the frame and has two layers;

[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 second secondary winding are arranged on the same side as the primary winding, and the third secondary winding, the fourth secondary winding, and the fifth secondary winding are arranged on different sides from the primary winding.

[0009] Preferably, in the flyback transformer, the primary winding is provided with two layers and arranged adjacent to each other, the primary winding is arranged on the bottom surface of the skeleton cavity, and side bands are provided on both sides of the primary winding and the secondary winding.

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

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

[0012] Preferably, in the flyback transformer, the skeleton and the magnetic core are fixed by AAA glue.

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

[0014] Preferably, in the flyback transformer, the magnetic core comprises two half-core parts, grooves are arranged at intervals on the two half-core parts, bosses matching the grooves are arranged on the skeleton, and the two half-core parts and the skeleton are detachably connected through the grooves and the bosses.

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

[0016] The 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 a narrow environment. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0019] Figure 3 The utility model is a circuit diagram of a 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 1-3A flyback transformer, comprising a skeleton 1, wherein the skeleton 1 has a cavity for placing a winding assembly, the winding assembly is arranged in the cavity, a magnetic core 2 is arranged outside the skeleton 1, a pin 9 is arranged at the bottom of the skeleton 1, and the pin 9 is integrally formed with the skeleton 1;

[0023] The winding assembly includes a primary winding W1, which is arranged in the cavity of the frame and has two layers;

[0024] The secondary winding is provided with five layers, including a first secondary winding W2, a second secondary winding W3, a third secondary winding W4, a fourth secondary winding W5, and a fifth secondary winding W6 in sequence; the first secondary winding W2 and the second secondary winding W3 are arranged on the same side as the primary winding W1, and the third secondary winding W3, the fourth secondary winding W4, and the fifth secondary winding W5 are arranged on different sides from the primary winding W1.

[0025] The primary winding W1 is provided with two layers and is arranged adjacent to each other. The primary winding W1 is arranged on the bottom surface of the frame cavity. Side bands 8 are arranged on both sides of the primary winding W1 and the secondary winding.

[0026] The primary winding W1, the first secondary winding W2, and the second secondary winding W3 are all wound clockwise around the winding area of ​​the skeleton 1 between the pins 9 through the first copper wire 6, and the third secondary winding W4, the fourth secondary winding W5, and the fifth secondary winding W6 are wound clockwise around the winding area of ​​the skeleton 1 between the pins 9 through the second copper wire 3.

[0027] The first copper wire 6 and the second copper wire 3 are both FIW6 grade; the skeleton 1 and the magnetic core 2 are fixed by AAA glue.

[0028] A tape layer 4 is arranged between the primary winding W1 and the secondary winding; the magnetic core 2 includes two half-core parts, grooves 10 are arranged at intervals on the two half-core parts, and a boss matching the groove 10 is arranged on the skeleton 1, and the two half-core parts and the skeleton 1 are detachably connected through the groove 10 and the boss.

[0029] Preparation process of the utility model:

[0030] Step 1. The frame 1 is a bakelite frame, and 1.5 mm side tapes 8 are placed on both sides of the frame 2 before winding. The first copper wire 6 is wound around the pin of the frame 1, and then wound clockwise around the winding area of ​​the frame 1, and then ended from the other pin. After the winding is completed, W3 is formed, and then wrapped with high-temperature tape 4;

[0031] Step 2. Place 1.5mm side tapes 8 on both sides of the frame 1 before winding. The first copper wire 6 is wound around the pin of the frame 1, clockwise around the winding area of ​​the frame 1, and then ends from the other pin. After winding is completed, W2 is formed, and then wrapped with high-temperature tape 4;

[0032] Step 3. Place 1.5mm side tape 8 on both sides of the frame 1 before winding. Wind the first copper wire 6 around the pin of the frame 1, and then wind it clockwise around the winding area of ​​the frame 1, and then end from the other pin. After winding, wrap it with high-temperature tape 4. Repeat the above steps once to form W1, and then wrap it with high-temperature tape 4;

[0033] Step 4. Place 1.5mm side tape 8 on both sides of the frame 1 before winding. Wind the second copper wire 3 around the pin of the frame 1, clockwise around the winding area of ​​the frame 1, and then end from the other pin. After winding, form W5, and then wrap it with high-temperature tape;

[0034] Step 5. Place 1.5mm side tape 8 on both sides of the frame 1 before winding. Wind the second copper wire 3 around the pin of the frame 1, and then wind it clockwise around the winding area of ​​the frame 1, and then end from the other pin. After winding, form W6, and then wrap it with high-temperature tape 4.

[0035] Step 6. Place 1.5mm side tapes 8 on both sides of the skeleton 1 before winding, and wind the second copper wire 3 around the pin of the skeleton 1, winding it clockwise around the winding area of ​​the skeleton 1, and then ending from the other pin. After winding is completed, W4 is formed, and then wrapped with high-temperature tape 4;

[0036] Step 7. Install the magnetic core 2 on the frame 1 and fix the magnetic core 2 with AAA glue 5 and yellow tape 8. The circuit diagram of the transformer is as follows: Figure 3 shown.

[0037] 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. A 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, which is arranged in a cavity of the frame and has two layers; 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 second secondary winding are provided on the same side as the primary winding, and the third secondary winding, the fourth secondary winding, and the fifth secondary winding are provided on different sides from the primary winding; The magnetic core (2) comprises two half-magnetic core parts, grooves (10) are arranged at intervals on the two half-magnetic core parts, and bosses matching the grooves (10) are arranged on the skeleton (1), and the two half-magnetic core parts and the skeleton (1) are detachably connected via the grooves (10) and the bosses.

2. The flyback transformer according to claim 1, characterized in that: The primary winding is provided with two layers and is arranged adjacent to each other. The primary winding is arranged on the bottom surface of the skeleton cavity. Side bands (8) are arranged on both sides of the primary winding and the secondary winding.

3. The flyback transformer according to claim 1, characterized in that: The primary winding, the first secondary winding and the second secondary winding are all wound clockwise around the winding area of ​​the frame (1) between the pins (9) through a first copper wire (6), and the third secondary winding, the fourth secondary winding and the fifth secondary winding are wound clockwise around the winding area of ​​the frame (1) between the pins (9) through a second copper wire (3).

4. The flyback transformer according to claim 3, characterized in that: The first copper wire (6) and the second copper wire (3) are both of FIW6 grade.

5. The flyback transformer according to claim 1, characterized in that: The skeleton (1) and the magnetic core (2) are fixed by AAA glue.

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

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