Trends and emerging techniques in isolated power converters

• Fully integrated isolated power converters with on-chip transformers are favored for compactness and >5 kV isolation, but early designs suffer from low efficiency (<34%) due to low Q-factor of on-chip transformers. • Specialized fabrication techniques, such as laminated magnetic cores and ultra-thick metal windings, improve transformer Q-factor and efficiency, achieving up to 52% peak efficiency. • Transformer-in-package designs offer a balance between integration and performance, addressing limitations of silicon-based windings. • Key challenges include multi-stage power conversion efficiency losses and EMI compliance with standards like CISPR-32 and EN-55032 Class B.