Research on boost conversion of SiC-based laser power supply for aerospace applications

This paper presents an optimized design of a two-phase interleaved critical conduction mode (CRM) Boost converter for spaceborne laser power supplies, addressing stringent requirements on efficiency and power density. The proposed topology integrates SiC devices with a magnetically integrated coupled inductor to improve system performance. By analyzing the behavior of the coupled inductor under CRM operation, the concepts of equivalent steady-state inductance and equivalent transient inductance are introduced within a unified analytical model, which reveals their influence on dynamic response speed, input current ripple, and switching frequency. In terms of control, a dynamic on-time compensation method based on a static operating point is developed. This approach achieves precise 180° phase interleaving and current sharing by directly adjusting the comparator reference voltage, without requiring external high-speed controllers. The method not only simplifies hardware implementation but also significantly reduces the effort of PI parameter tuning. A 1 kW prototype with an input range of 100-300 V was constructed to validate the proposed design. Experimental results demonstrate clear advantages in volume reduction, stability improvement, transient response, and efficiency, achieving a peak efficiency of 97.5%. These results confirm the feasibility and engineering value of the proposed converter in space-based laser power supply applications.