Overlarge-current center-tapped transformer

Abstract

The utility model provides an overlarge current center tapped transformer, which comprises a magnetic core, a secondary winding, primary windings, an insulating film and a bonding pad, the primary windings and the secondary winding are stacked in the following sequence: the secondary winding is clamped between the two symmetrical primary windings; the bottoms of the winding coils and the coil intervals are isolated by insulating films; the secondary winding and the primary winding are placed in the magnetic core and fixed by dispensing; the magnetic core adopts a manganese-zinc series ferrite magnetic core; the secondary winding adopts a primary side enameled copper flat wire coil, and the primary winding adopts a secondary side enameled copper flat wire coil; the bonding pad is a pin of the tin-dipped paint-film-free winding coil; the adopted winding superposition mode is good in coupling, low in control leakage inductance and small in distributed capacitance, and has the characteristics of high frequency, high voltage, high power density, high power transmission efficiency, low loss and the like; the flat design is realized by using the overlapping mode that the flat wire coil is matched with the winding; the structure is simple, the technological process is short, machining is easy, and installation is easy.

Description

Technical Field

[0001] This utility model belongs to the field of transformers, and specifically relates to a center-tapped transformer for excessive current. Background Technology

[0002] As electronic circuits evolve towards higher frequencies, higher power densities, higher reliability, and higher integration, higher demands are being placed on DC power supplies. High switching frequencies, low losses, high power density, higher switching frequencies, modularity, and flattening are the development trends for DC power supplies.

[0003] Currently, DC switching power supplies that better meet the requirements generally adopt a soft-switching resonant approach. To reduce the overall size of the power supply, the inductors and capacitors of the resonant circuit are typically provided by the leakage inductance and distributed capacitance of the main transformer (as well as the distributed capacitance of the switching transistor). However, it is difficult to control the batch consistency of the leakage inductance and distributed capacitance of traditional transformers, which brings great difficulties to the actual batch production and debugging of the circuit. In addition, the three-dimensional structure of traditional transformers is no longer suitable for the current trend of flat power supplies. Because its structure is not conducive to heat dissipation, it is difficult to achieve the development trend of high frequency, low loss, high power density, and flat modular design. Utility Model Content

[0004] To solve the above problems, this utility model provides a center-tapped transformer for excessive current, comprising: a magnetic core, a secondary winding, a primary winding, an insulating film, and solder pads. The primary and secondary windings are stacked in the following order: the secondary winding is sandwiched between two symmetrical primary windings; at the bottom of the winding coils, the winding coils are separated from each other by an insulating film; the secondary and primary windings are fixed inside the magnetic core with adhesive.

[0005] The magnetic core uses a manganese-zinc series ferrite core.

[0006] There is one magnetic core.

[0007] The secondary winding uses a primary-side enameled copper flat wire coil, and the primary winding uses a secondary-side enameled copper flat wire coil.

[0008] The same primary winding and secondary winding have only one multi-turn circuit.

[0009] The solder pads and the winding coil are integrated.

[0010] The pads are for the leads of the uncoated, tin-dipped winding coils.

[0011] The insulating film is made of polyimide.

[0012] The thickness of the insulating film is 0.05 mm.

[0013] This utility model has the following beneficial effects:

[0014] 1) The winding superposition method adopted in this utility model has good coupling, low control leakage inductance, small distributed capacitance, and features high frequency, high voltage, high power density, high power transmission efficiency, and low loss.

[0015] 2) This utility model achieves a flat design by using a combination of flat wire coils and windings.

[0016] 3) This utility model has a simple structure, short process flow, and is easy to process and install. Attached Figure Description

[0017] Figure 1 This is a front view of an embodiment of the present utility model;

[0018] Figure 2 This is a left view of an embodiment of the present utility model.

[0019] Icons: 1-Magnetic core; 2-Secondary winding; 3-Primary winding; 4-Insulating film; 5-Solder pad. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] Please see Figure 1-2 This utility model provides a technical solution: a center-tapped transformer for high current, comprising: a magnetic core 1, a secondary winding 2, a primary winding 3, an insulating film 4, and a solder pad 5. The primary winding 3 and the secondary winding 2 are stacked in the following order: the secondary winding 2 is sandwiched between two symmetrical primary windings 3. The structure is more compact, the spatial distance is reduced, and the amount of leakage flux is reduced.

[0023] The secondary winding 2 uses a primary-side enameled copper flat wire coil, and the primary winding 3 uses a secondary-side enameled copper flat wire coil. The secondary-side-sandwiching-primary-side configuration provides good coupling, low control leakage inductance, and ease of assembly. It also results in smaller distributed capacitance between the primary and secondary windings. This design is suitable for manufacturing high-frequency, high-current transformers. Compared to traditional enameled round wire center-tapped transformers, this type of transformer not only has stronger overcurrent capacity but also has a lower height, meeting the requirements for flattening.

[0024] The primary winding 3 and the secondary winding 2 have only one multi-turn circuit.

[0025] At the bottom of the winding coil, the winding coils are separated from each other by an insulating film 4; the secondary winding 2 and the primary winding 3 are placed inside the magnetic core and fixed with adhesive.

[0026] Core 1 uses a manganese-zinc series ferrite core. It has high permeability and good high-frequency characteristics.

[0027] There is one magnetic core. It can enhance the magnetic field.

[0028] Pad 5 is integrated with the coil. Pad 5 is the lead of the uncoated, tin-dipped winding coil.

[0029] The insulating film 4 is made of polyimide. It can be used for extended periods at 250°C and can operate for several hours at 400°C. The thickness of the insulating film 4 is 0.05 mm.

[0030] This invention features a winding superposition method that provides good coupling, low control leakage inductance, and small distributed capacitance. It also features high frequency, high voltage, high power density, high power transmission efficiency, and low loss. By using a superposition method with flat wire coils, a flat design is achieved. Furthermore, the structure is simple, the process is short, and it is easy to process and install.

[0031] The above-disclosed embodiments are merely specific examples of this utility model. However, this utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. An overcurrent center-tapped transformer characterized by, The application relates to a magnetic core (1), a secondary winding (2), a primary winding (3), an insulating film (4) and a soldering pad (5), wherein the primary winding (3) and the secondary winding (2) are arranged in a superimposed manner, and the secondary winding (2) is sandwiched between two symmetrical primary windings (3); the winding coil bottom is separated by the insulating film (4); and the secondary winding (2) and the primary winding (3) are fixed in the magnetic core (1) by point gluing. The magnetic core (1) is made of a manganese-zinc series ferrite core.

2. The overcurrent center-tapped transformer of claim 1, wherein, The magnetic core (1) is one.

3. The overcurrent center-tapped transformer of claim 1, wherein: The secondary winding (2) is made of a primary side enameled copper flat coil, and the primary winding (3) is made of a secondary side enameled copper flat coil.

4. The overcurrent center-tapped transformer of claim 1, wherein: The same primary winding (3) and secondary winding (2) have only one multi-turn loop.

5. The overcurrent center-tapped transformer of claim 1, wherein: The soldering pad (5) is integrated with the winding coil.

6. The overcurrent center-tapped transformer of claim 1, wherein: The soldering pad (5) is a pin of the winding coil without a lacquer film.

7. The overcurrent center-tapped transformer of claim 6, wherein: The insulating film (4) is made of a polyimide film.

8. The overcurrent center-tapped transformer of claim 1, wherein: The thickness of the insulating film (4) is 0.05 mm.

9. The overcurrent center-tapped transformer of claim 8, wherein: ​

Images