High efficiency quasi-parallel Voltage Regulators

High efficiency voltage regulators (VR) are desired for battery life extension and energy saving. In this paper, a novel quasi-parallel VR architecture is proposed. Its working principle and small signal model are illustrated in detail. The proposed VR takes advantage of the high-efficiency, fast-transient unregulated converter and relies on it to deliver most of the output power, while uses low power Buck type converter to achieve voltage regulation. The simulation and preliminary experimental results demonstrate that the proposed VR can achieve 4%-5% higher efficiency than state-of-the-art multi-phase buck VR and it can eliminate all the output bulk capacitors with 600k Hz switching frequency.