US20260269722
2026-09-10
Electricity
H02M3/07
The patent application introduces a Hybrid Switched Capacitor Converter (HSCC) topology designed for high conversion ratio Point-of-Load (POL) applications, specifically for 48V to 1V power delivery in space-based high-performance computing systems. This converter is particularly beneficial in environments where size, weight, and radiation tolerance are critical. The topology combines an initial 2:1 switched capacitor conversion stage with a Symmetric Dual Inductor Hybrid (SDIH) stage, optimizing both component count and switch stress, while significantly reducing the volume of flying capacitors.
Hybrid Switched-Capacitor converters have shown high performance in regulating 48V to POL applications due to reduced switch stress and passive component volume. This makes them suitable for high-density, lightweight space applications that require radiation tolerance. The invention addresses the need for improved power conversion circuitry by utilizing Gallium Nitride (GaN) switching devices, known for their radiation hardness and efficiency, thereby enhancing the feasibility of HSCCs in spacecraft and satellite systems.
The proposed topology merges a 2:1 switched capacitor stage with an SDIH stage, offering reduced component count and switch stress. The initial stage reduces flying capacitor volume, allowing for a compact, lightweight converter. A high-density gate drive solution is also detailed, minimizing the number of driver Integrated Circuits (ICs) without compromising performance. A hardware prototype demonstrates the topology's feasibility, employing de-rated GaN switches to mitigate radiation effects.
The topology includes an initial switched capacitor stage, providing a 2:1 conversion, merged with the SDIH topology. This integration reduces component requirements and enhances performance. The first stage receives a 48V input, directing power through a switched capacitor matrix. The SDIH stage, configured with interleaved switches and capacitors, further reduces volume and removes redundant switches. The converter's design ensures efficient charge transfer and voltage regulation, with interleaved outputs enhancing transient response.
The converter operates in a four-phase progression, facilitating Pulse Width Modulation (PWM) voltage regulation. Phases include charge conduction and free-wheeling regulation, enabling effective output voltage control. The design's interleaved switching and coupled inductors reduce size and improve response. By equalizing flying capacitor sizes, the need for split-phase switching is minimized, simplifying the control scheme. This innovative approach enhances the converter's efficiency and applicability in demanding space environments.