Ultra-Compact Topology　Isolated TriMagiC Converter™ Diamet Corporation

TriMagiC Converter™ (TMC) is primarily targeted at high-power power supply applications requiring compact size, high efficiency, and high power density. Currently, we are developing and evaluating isolated DC-DC converters in the 1.6 kW and 3.3 kW classes, targeting applications such as data centers, industrial equipment, and telecommunications systems where both high efficiency and compact design are essential.

In particular, power supplies for AI data centers are facing increasing demands for higher output power, higher-density packaging, and improved thermal performance. By integrating the functions of the main transformer and output smoothing inductor required in conventional PSFB converters, TMC significantly reduces the number and volume of magnetic components, contributing to smaller and lower-loss power supplies.

The greatest advantage of TriMagiC Converter™ (TMC) is its ability to achieve miniaturization and high efficiency by fundamentally redesigning the converter topology itself.

Conventional isolated DC-DC converters such as PSFB require separate main transformers and smoothing inductors. TMC integrates these functions through its unique alternating ON-ON / ON-OFF operation using two transformers. As a result, magnetic component volume can be reduced to approximately one-third, while overall power supply size can be reduced to about two-thirds compared to conventional designs.

In addition, the alternating ON-ON / ON-OFF operation partially cancels magnetic flux, reducing magnetic flux variation (ΔB). This significantly suppresses core loss, improving efficiency and thermal performance. Our prototype has achieved 97.2% conversion efficiency.

TMC also reduces output ripple current, enabling smaller output capacitors. Furthermore, because it uses the same control scheme as conventional PSFB converters, existing control technologies can be utilized with minimal changes.