LLC Resonant Converter with The Design of High-Quality-Factor Q for the Wide Voltage Rang Applications
Year: 2025
Type: conference-paper
Abstract: In the wide voltage rang application, due to the natural advantages of zero-voltage-switching (ZVS) for primary MOSFETs, zero-current-switching (ZCS) for secondary diodes, high efficiency, simple structure and control of the inductor–inductor–capacitor (LLC) resonant converters, it has attracted much attention. However, the traditional LLC design method faces many challenges in the wide voltage range application. In this paper, high-quality-factor Q (high Q-LLC) design method for traditional LLC is proposed to solve the problem that the traditional LLC with pulse-frequency-modulation (PFM) controlled is not applicable for the wide gain application. Increasing quality factor Q can make the normalized gain profile of the LLC with PFM much steeper in the interval greater than the resonance frequency. Therefore, the traditional LLC without added any components can achieve wide voltage Gain. ZVS of the all primary MOSFETs can achieved over the full output voltage range and load conditions. Finally, a prototype with 100∼900V output of 1kW has been designed to feasibility of the proposed high Q-LLC design method. The maximum efficiency of prototype is 97.7% and features excellent voltage regulation capability. Thus, the proposed high Q-LLC design method is applied to the wide voltage gain applications.
Authors: Haiming Yu, Yaolin Lou, Qiyao Yang
Language: English
Topic: Advanced DC-DC Converters
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4408456056