Closed-loop voltage control of a GaN-based modular multilevel clamped capacitor converter
- Resource Type
- Conference
- Authors
- Wu, Liyao; Saeedifard, Maryam
- Source
- 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) Applied Power Electronics Conference and Exposition (APEC), 2018 IEEE. :1546-1553 Mar, 2018
- Subject
- Power, Energy and Industry Applications
Capacitors
Switches
Voltage control
Time-domain analysis
Steady-state
Density measurement
Power system measurements
MMC3
GaN FETs
switched-capacitor converter
time-domain model
output voltage regulation
- Language
- ISSN
- 2470-6647
The Modular Multilevel Clamped Capacitor Converter (MMC3) is an attractive switched-capacitor converter topology with desired features including high voltage conversion ratio, high power density and modularity. However, its application is hindered because of the lack of output voltage regulation. This paper proposes a closed-loop voltage control strategy for the MMC3 based on a detailed time-domain model of the converter. The proposed strategy relies on the impact of Pulse Dropping Technique (PDT) on the MMC3 conversion ratio to regulate the output voltage. A compact MMC3 prototype is designed and built with GaN FETs and tested up to 40 W. The developed model and proposed control strategy are validated by simulation and experimental studies.