Improved Quasi-Z-Source High Step-Up DC-DC Converter Based on Voltage-Doubler Topology

Toru Sai; Younghyun Moon; Yasuhiro Sugimoto

doi:10.3390/s22249893

Improved Quasi-Z-Source High Step-Up DC-DC Converter Based on Voltage-Doubler Topology

Sensors (Basel). 2022 Dec 15;22(24):9893. doi: 10.3390/s22249893.

Authors

Toru Sai¹, Younghyun Moon¹, Yasuhiro Sugimoto²

Affiliations

¹ Faculty of Engineering, Tokyo Polytechnic University, Tokyo 243-0297, Kanagawa, Japan.
² Sugimoto Registered Consulting Engineer's Office, Yokohama 224-0056, Kanagawa, Japan.

Abstract

The step-up DC-DC converter is widely used for applications such as IoT sensor nodes, energy harvesting, and photovoltaic (PV) systems. In this article, a new topological quasi-Z-source (QZ) high step-up DC-DC converter for the PV system is proposed. The topology of this converter is based on the voltage-doubler circuits. Compared with a conventional quasi-Z-source DC-DC converter, the proposed converter features low voltage ripple at the output, the use of a common ground switch, and low stress on circuit components. The new topology, named a low-side-drive quasi-Z-source boost converter (LQZC), consists of a flying capacitor (C_F), the QZ network, two diodes, and a N-channel MOS switch. A 60 W laboratory prototype DC-DC converter achieved 94.9% power efficiency.

Keywords: high step-up DC–DC converter; high-side driver free; low voltage stress; quasi-Z-source; voltage-doubler.

Grants and funding

This research received no external funding.