Operating Principle of Current Resonant Converter Using Air Core Transformer for Isolated Power Supply on Chip

A power-SoC can realize compact and thin power supply although the power capacity is very small (low voltage input and low voltage / current output). The isolated power supplies are required to achieve the hybrid connection of series and parallel in order to adapt the high input voltage and high current output applications. On the other hand, the switching frequency tends to be very high due to small passive components. However, the loss of the magnetic material becomes severe problem. In this paper, the air core transformer is adapted and the current resonant converter is evaluated as an example of isolated power-SoC. Moreover, the isolated power supply is implemented on PCB in order to confirm the operating principle of the isolated power-SoC.