Introduction to planar transformer

- Jan 31, 2020-

The planar magnetic core is successfully developed, which can realize the planar transformer design. Since the planar transformer requires a magnetic core and windings to have a planar structure, a multilayer PCB winding should be used. Now, many companies have developed planar transformers, Pulse has developed planar magnetic components, and Payton of Israel has developed PlanTIcs planar transformers, with power from 5W to 20KW, frequency from 20KHz to 2MHz, and the efficiency can usually reach 98. %, Ideal for telecommunications, welding machines, computers and peripherals, networking, medical electronics, industrial control, security systems and electronic equipment.

The biggest difference between planar transformers and traditional transformers lies in the core and coil windings. Planar transformers use small-sized E-type, RM-type or toroidal ferrite cores, which are usually made of high-frequency power ferrite materials, and have low core loss at high frequencies; the windings are printed in multiple layers The circuit board is wound in layers, and the windings or copper sheets are stacked on a flat high-frequency iron core to form a magnetic circuit of the transformer. This design has low DC copper resistance, low leakage inductance and distributed capacitance, which can meet the design requirements of resonant circuits. And because of the good magnetic shielding of the magnetic core, radio frequency interference can be suppressed.