Open Access
ARTICLE
A Novel Polymorphic Topology with Hybrid Control Strategy Based LLC Resonant Converter for Ultra-Wide Input Voltage Range Applications
Chi Zhang, Yong Shi*, Xuwei Gui
School of Electrical and Control Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China
* Corresponding Author: Yong Shi. Email:
Energy Engineering 2021, 118(2), 341-361. https://doi.org/10.32604/EE.2021.014229
Received 10 September 2020; Accepted 05 November 2020; Issue published 23 December 2020
Abstract
To realize effective utilization of renewable energy sources, a novel
polymorphic topology with hybrid control strategy based LLC resonant converter
was analyzed and designed in this paper. By combining the merits of a full bridge
LLC resonant converter, three-level half bridge LLC resonant converter, and variable frequency control mode, the converter realizes an intelligent estimation of
input voltage by automatically changing its internal circuit topology. Under this
control strategy, different input voltages determine different operation modes.
This is achieved in full bridge LLC mode when the input voltage is low. If the
input voltage rises to a certain level, it operates in three-level half bridge LLC
mode. These switches are digital and entirely carried out by the DSP (Digital Signal Processor), which means that an auxiliary circuit is unnecessary, where a simple strategy of software modification can be utilized. Experimental results of a
500W prototype with 100V~600V input voltage and full load efficiency of up
to 92% are developed to verify feasibility and practicability. This type of converter is suitable for applications with an ultra-wide input voltage range, such as wind
turbines, photovoltaic generators, bioenergy, and other renewable energy sources.
Keywords
Cite This Article
Zhang, C., Shi, Y., Gui, X. (2021). A Novel Polymorphic Topology with Hybrid Control Strategy Based LLC Resonant Converter for Ultra-Wide Input Voltage Range Applications.
Energy Engineering, 118(2), 341–361. https://doi.org/10.32604/EE.2021.014229