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Improved Quasi-Z-Source High Step-Up DC-DC Converter Based on Voltage-Doubler Topology
Toru Sai1, Younghyun Moon1, Yasuhiro Sugimoto2
1Faculty of Engineering, Tokyo Polytechnic University, Tokyo 243-0297, Kanagawa, Japan.
Sensors (Basel, Switzerland)
|December 23, 2022
Summary
A novel quasi-Z-source (QZ) high step-up DC-DC converter, the low-side-drive quasi-Z-source boost converter (LQZC), offers improved performance for photovoltaic systems. This new topology achieves high efficiency and reduces component stress, making it ideal for renewable energy applications.
Area of Science:
- Electrical Engineering
- Power Electronics
- Renewable Energy Systems
Background:
- Step-up DC-DC converters are crucial for IoT, energy harvesting, and photovoltaic (PV) systems.
- Conventional quasi-Z-source (QZ) converters face limitations in efficiency and component stress.
Purpose of the Study:
- To propose a new high step-up DC-DC converter topology for PV systems.
- To enhance efficiency and reduce component stress compared to existing QZ converters.
Main Methods:
- A novel topology, the low-side-drive quasi-Z-source boost converter (LQZC), was developed.
- The LQZC utilizes voltage-doubler circuits, a flying capacitor (CF), QZ network, diodes, and a N-channel MOS switch.
Main Results:
- The proposed LQZC exhibits low output voltage ripple and reduced component stress.
- A 60 W laboratory prototype achieved a high power efficiency of 94.9%.
Conclusions:
- The novel LQZC topology presents a promising solution for high step-up conversion in PV systems.
- The converter's design offers advantages in efficiency, component stress, and output characteristics.
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