Work

Pulse Train Control Strategy for a Series Capacitor Buck Converter in Discontinuous Conduction Mode

Year: 2026

Type: article

Abstract: This paper proposes a Pulse Train Control (PTC) strategy for the Series Capacitor Buck (SCB) converter operating in Discontinuous Conduction Mode (DCM). Instead of synthesizing a continuous duty ratio, the controller selects between two preset duty ratios in each switching period, and the same binary decision is applied to the two interleaved phases with a 180∘ phase shift. A reduced one-dimensional control-oriented discrete-time map is derived from output charge balance to describe the control cycle-scale regulation dynamics. Based on this map, the bounded-regulation condition is established and the design roles of the pulse pair (DH,DL) are clarified. The regulated steady state is shown to be a bounded threshold-crossing periodic motion rather than a static equilibrium, and the evolution of pulse patterns with operating condition is interpreted through border collision transitions. Full switching model and experimental results from a 12-V-to-1-V prototype support the predicted high-pulse fraction trend, the multiplier-based local attraction assessment of annotated periodic pulse patterns, the input voltage-dependent ripple estimate, and the fast large-signal response under representative load step conditions.

Source: Energies

DOI: 10.3390/en19112500

Authors: Zhiwen Zeng, Lijun Hang, Yangwei Yu, Yuanbin He, Chengguo Qian, Lijun Song

Institutions: Hangzhou Dianzi University, Zhejiang University

Language: English

Topic: Advanced DC-DC Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $3,137