A novel low-ripple adjustable DC regulated power supply with single-phase AC input and control strategy

Single-phase AC-input low-ripple DC regulated power supplies are critical for sensitive applications. However, conventional designs often suffer from complex power circuit configurations, increasing cost and size while potentially compromising reliability. Achieving simultaneously low output voltage ripple, high steady-state accuracy, and wide output voltage adjustability remains a significant challenge in power electronics.

This study aims to overcome the limitations of existing topologies by proposing a novel single-phase AC-input low-ripple adjustable DC regulated power supply circuit. Furthermore, it develops a dedicated advanced control strategy to meet stringent performance requirements for low-ripple and high-stability.

The fundamental principles of the proposed topology were analyzed, and its mathematical model was established to characterize voltage transmission. A composite control scheme integrating reference output voltage amplitude self-compensation using improved iterative learning control (ILC), and a dual-loop proportional complex integral (PCI) control structure, was designed for precise low-ripple regulation and stability. The effectiveness was validated via simulation and experimental testing on a prototype.

Validation confirmed successful operation. Comparative analysis demonstrated the topology’s advantages: a simpler and more compact structure, widely adjustable output voltage, significantly reduced ripple, and improved steady-state accuracy. The control strategy effectively ensured stability and met performance targets.

The combined novel topology and advanced control provide a viable solution for high-quality single-phase AC-input adjustable DC supplies.