The planar magnetic core has been successfully developed, and a planar transformer design can be realized. Since the planar transformer requires the core and winding to be a planar structure, multilayer PCB windings should be used. Nowadays, many companies have developed planar transformers. Pulse company has developed planar magnetic components. Israel Payton company Payton has developed Planetics planar transformers. The power ranges from 5W to 20KW, the frequency ranges from 20KHz to 2MHz, and the efficiency can usually reach 98. %, it is an ideal choice for telecommunications, welding machines, computers and peripherals, networks, medical electronics, industrial control, security systems and electronic equipment.
Planar transformers are characterized by high frequency, low profile, small height and high operating frequency.The transformer is a key component in the power supply. Traditional transformers are usually composed of ferrite cores and copper coils, which are bulky and prone to electromagnetic interference. Planar Transformer can effectively solve the volume and high frequency problems.
The biggest difference between planar transformers and traditional transformers is the iron core and coil windings. Planar transformers use small-size E-type, RM-type or toroidal ferrite cores, usually made of high-frequency power ferrite materials, which have low core loss at high frequencies; windings are printed in multiple layers The circuit board is stacked, and the winding or copper sheet is stacked on the flat high-frequency iron core to form the 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. Moreover, due to the good magnetic shielding of the magnetic core, radio frequency interference can be suppressed.