Journal ArticleDOI
LLC Resonant Converter With Adaptive Link-Voltage Variation for a High-Power-Density Adapter
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TLDR
In this article, an LLC resonant converter with an adaptive linkvoltage-variation (ALVV) scheme is proposed to operate at a nearly constant resonant frequency and also allows for the optimal design of the converter.Abstract:
The output voltage of an adapter for a laptop computer should vary according to the load current in order to supply power to the computer To satisfy this requirement, an LLC resonant converter with an adaptive link-voltage-variation (ALVV) scheme is proposed in this letter The proposed ALVV scheme helps the LLC resonant converter to operate at a nearly constant resonant frequency and also allows for the optimal design of the converter High power density and high efficiency can therefore be obtained The proposed LLC resonant converter with the ALVV scheme is analyzed theoretically and verified experimentallyread more
Citations
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Journal ArticleDOI
Operation Mode Analysis and Peak Gain Approximation of the LLC Resonant Converter
TL;DR: In this article, a generalized mode analysis is presented that provides highly accurate prediction on resonant current and voltage behavior and dc gain characteristic, and an approximation method is developed to estimate the peak gain point, which is useful in LLC design.
Journal ArticleDOI
A Modified High-Efficiency LLC Converter With Two Transformers for Wide Input-Voltage Range Applications
TL;DR: In this paper, a modified LLC converter with two transformers in series, which has four operation configurations, covering the range of four times the minimum input voltage, is proposed to minimize the magnetizing current and thus minimize the conduction and core losses.
Journal ArticleDOI
A Design Procedure for Optimizing the LLC Resonant Converter as a Wide Output Range Voltage Source
TL;DR: In this article, a design procedure is introduced for using LLC resonant converter as a wide output range voltage source, where the maximum value of the capacitor in parallel with the power MOSFETs drain-sources is derived to realize the zero voltage switching operation in the converter inductive region.
Journal ArticleDOI
A Survey, Classification, and Critical Review of Light-Emitting Diode Drivers
TL;DR: Based on a survey on over 1400 commercial LED drivers and a literature review, a range of LED driver topologies are classified according to their applications, power ratings, performance and their energy storage and regulatory requirements as discussed by the authors.
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.
References
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Proceedings ArticleDOI
Dynamic voltage scaling on a low-power microprocessor
TL;DR: A system with a microprocessor whose speed can be varied (frequency scaling) as well as its supply voltage, which allows power-aware applications to quickly adjust the performance level of the processor whenever the workload changes.
Journal ArticleDOI
A Bridgeless PFC Boost Rectifier With Optimized Magnetic Utilization
Yungtaek Jang,Milan M. Jovanovic +1 more
TL;DR: In this article, a bridgeless power factor correction (PFC) boost rectifier with low common-mode noise is presented. Butler et al. employed a unique multiple-winding, multicore inductor to increase the utilization of the magnetic material and verified the operation and performance of the circuit on a 750-W, universal line experimental prototype operating at 110 kHz.
Journal ArticleDOI
Analysis and Optimization of LLC Resonant Converter With a Novel Over-Current Protection Circuit
TL;DR: In this paper, a novel overcurrent protection (OCP) method for a LLC resonant converter has been proposed, which is very attractive for its inherent current limit ability, especially under short-circuit condition.
Journal Article
Design Consideration of Half-Bridge LLC Resonant Converter
TL;DR: In this article, the authors presented analysis and design consideration for the half bridge LLC resonant converter using the fundamental approximation, where the leakage inductance in the transformer secondary side was also considered, and the practical design procedure was investigated to optimize the resonant network for a given input/output specifications.
Proceedings ArticleDOI
Performance evaluation of 70-W two-stage adapters for notebook computers
Y. Panov,M.M. Jovanovic +1 more
TL;DR: In this paper, the design and performance evaluation of two-stage AC power adapters for notebook computers which deliver 70 W from the universal line is presented, and three versions of the flyback power converter, as well as the PWM and resonant half-bridge power converter are evaluated and compared with respect to their efficiency, component stress, output filter size and complexity.