Ultra-small transformer using insulated hybrid structure for AC adapters of smart devices

Increasing strong demand for smaller insulated transformers, an ultra-small transformer has been developed by adopting an insulated hybrid structure with the size of W16.5 × L19.5 × H10.5 mm⁁3, whose volume is 65 % smaller than conventional insulated transformers. Our new transformer has been improved in terms of noise reduction by 5–15 dB, power efficiency increase by 2 %, and production efficiency by 50 %. Relevant analyses are to be given.