Journal ArticleDOI
PWM and PFM Hybrid Control Method for LLC Resonant Converters in High Switching Frequency Operation
Hwa-Pyeong Park,Jee-Hoon Jung +1 more
TLDR
A hybrid control method combining pulse frequency modulation (PFM) and pulse width modulation is proposed to overcome the limited frequency resolution issue and improve voltage regulation performance for LLC resonant converters.Abstract:
High switching frequency is an effective method to improve power density for LLC resonant converters. However, conventional digital controllers, such as general-purpose digital signal processors and microprocessors, have limited frequency resolution, which induces high primary- and secondary-side current variation and leads to poor output voltage regulation. In this paper, a hybrid control method combining pulse frequency modulation (PFM) and pulse width modulation is proposed to overcome the limited frequency resolution issue. The proposed hybrid control method focuses on steady-state operation, and its operating principles are introduced and analyzed. In addition, the proper magnetizing inductance and dead time duration are derived to ensure that the power mosfet s achieve zero voltage switching with the proposed control method. The improved voltage regulation performance is compared with the conventional PFM control and verified through simulation and experimental results using a 240 W prototype converter operating at a switching frequency of 1 MHz.read more
Citations
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Journal ArticleDOI
A PWM LLC Type Resonant Converter Adapted to Wide Output Range in PEV Charging Applications
Haoyu Wang,Zhiqing Li +1 more
TL;DR: In this paper, a modified pulse width modulated LLC type resonant topology (PWM-LLC) is proposed and investigated in PEV charging applications, where the switching frequency of the primary LLC network is constant and equal to the resonant frequency.
Journal ArticleDOI
Overview of Modulation Strategies for LLC Resonant Converter
TL;DR: The modulation strategies for LLC resonant converter can be categorized into three groups: 1) input voltage fundamental harmonic modulation; 2) resonant tank elements modulation; and 3) secondary equivalent impedance modulation.
Journal ArticleDOI
Nature of power electronics and integration of power conversion with communication for talkative power.
TL;DR: A double modulation strategy for both power and data is presented and applied in dc-dc power converters to achieve what the authors call ‘talkative power’ and a modulation strategy called frequency hopping-differential phase shift keying is proposed to enable power converter design integrated with communication.
Journal ArticleDOI
Variable Structure Control for Three-Phase LCL-Filtered Inverters Using a Reduced Converter Model
TL;DR: This proposal provides robust and simple active damping control under system parameters deviation; robustness against grid voltage unbalance and distortion; and an important reduction in the computational load of the control algorithm, which allows us to increase the switching frequency.
Journal ArticleDOI
MOSFET Power Loss Estimation in LLC Resonant Converters: Time Interval Analysis
TL;DR: In this paper, the authors proposed a method for enhancing power loss estimation in LLC inverter mosfet s based on time-domain analysis of the converter, which can further improve power loss assessment in this topology.
References
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Proceedings ArticleDOI
LLC resonant converter for front end DC/DC conversion
TL;DR: In this article, a LLC resonant converter is proposed for front end DC/DC conversion in a distributed power system, which utilizes leakage and magnetizing inductance of a transformer.
Journal ArticleDOI
Quantization resolution and limit cycling in digitally controlled PWM converters
TL;DR: In this paper, the presence of steady-state limit cycles in digitally controlled PWM converters is discussed, and conditions on the control law and quantization resolution for their elimination are suggested.
Journal ArticleDOI
Design Methodology of Bidirectional CLLC Resonant Converter for High-Frequency Isolation of DC Distribution Systems
TL;DR: In this paper, a bidirectional full-bridge CLLC resonant converter using a new symmetric LLC-type resonant network is proposed for low-voltage direct current power distribution system.
Journal ArticleDOI
Evaluation and Application of 600 V GaN HEMT in Cascode Structure
TL;DR: In this article, the characteristics and operation principles of a 600 V cascode GaN HEMT were studied and compared with a state-of-the-art silicon MOSFET.
Proceedings ArticleDOI
PWM Converter Power Density Barriers
Johann W. Kolar,U. Drofenik,Juergen Biela,Marcelo L. Heldwein,Hans Ertl,Thomas Friedli,S.D. Round +6 more
TL;DR: In this article, the authors investigated the volume of the cooling system and of the main passive components for the basic forms of power electronics energy conversion in dependency of the switching frequency and determined switching frequencies minimizing the total volume.