Research on Satellite Secondary Power Converters Based on Sinusoidal Amplitude Conversion

Conventional satellite secondary power systems suffer from three critical limitations: low power density (typically <30 W/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup>), sluggish dynamic response (>100 μs), and inadequate efficiency (<90%) in low-voltage high-current applications. To address these issues, this paper proposes a high-frequency resonant power supply architecture based on the Sinusoidal Amplitude Conversion (SAC) topology. By connecting the Power Pre-Modulation (PRM) and the Inductive Current Multiplier (ICM) in series to form a regulated voltage ratio distribution architecture, combined with fixed-frequency resonant control and integrated magnetics-electronics-thermal technology, performance indicators such as an efficiency of up to 96%, a power density exceeding 40 W/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup>, and a transient response of less than 30μs are achieved. Experimental results demonstrate that the proposed architecture maintains a transformation ratio error below 5% across a wide input voltage range (6–60 V), significantly outperforming conventional designs (typically >10% error), and can suppress output ripple without relying on large-capacity energy storage capacitors. This paper elaborates on the topology design, drive optimization, and system-level control strategies, and verifies the feasibility of the solution through simulation and actual measurement.