classification and characteristics of planar transformers

Classification and characteristics of planar transformers

The classification and characteristics of flat-panel transformers are generally divided into four types: the first one is flat ferrite cores, traditional winding winding structures, mainly high-frequency, high-voltage and low-power transformers, which have little advantage over traditional transformers ; The second type is a flat ferrite core, a copper foil winding structure, which is mainly used in high-frequency and high-power switching power supply modules that need to output low voltage and large current; the third type is a flat ferrite core, PCB printed The board windings are mainly high-frequency, medium- and small-power transformers; the fourth type is to use the LTCC (Ceramic Low Temperature Co-fired) process to print the windings on the ferrite sheet to form a winding array, multi-layer bonding and superposition, and co-fired Integrated, mainly for signal broadband transmission and isolation in high-frequency small-signal lines. The main features of flat-panel transformers are:

1 The product is flat, small in size, and small in thickness, which is in line with the modular development trend of power supplies;

 2 The structure is simple, and the flat transformer is composed of a small number of components and a minimum of windings. This type of module is particularly suitable for automated assembly.

3 High operating frequency and high power density: Traditional transformers will increase switching losses and overheat the transformer when operating at high frequencies. The emergence of flat-panel transformers has solved these problems. Flat-panel transformers can be designed as high-frequency transformers, providing a Economical and good transformer module. It can work between 100kHz and 1000kHz. Because of the small size of flat transformer components, it has excellent temperature dissipation characteristics, so it can be tightly packaged with related semiconductor devices and inductors , To achieve high power density.

4 High working efficiency: Adjust the leakage inductance, so that it can have a very fast switching time, and a very low cross loss, which can make it reach a very high efficiency. The turn-to-turn between the secondary winding and the primary winding of this transformer The conduction loss is very small.

5 Excellent heat dissipation characteristics: Flat transformers are small components with a high surface area to volume ratio and a short thermal path. It is good for heat dissipation. The inter-turn loss between the primary and secondary windings is very small. This kind of core The unique geometric shape can effectively reduce the core loss. So it can achieve high magnetic flux density. It can work between -55~130℃.

 6 Small electromagnetic radiation interference: The good coupling between the winding and the winding can keep the leakage inductance between the winding turns to a minimum. The connection between the output terminal and the auxiliary components is very short and tightly assembled, so the windings are connected to each other The leakage inductance on the line is also the smallest, so the electromagnetic radiation interference is small.

7 High reliability;

8 High insulation strength

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