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The following topics are dealt with: DC-DC converters; AC-DC converters; active power filters and power quality; inductive components; inverter topology; renewable energy; solid-state protectors and parasitic elements; energy harvesters; Z-source inverters; lighting; vehicular electronics; soft switching; motor drives and; module packaging.
In this paper, a novel switching frequency control scheme to track the resonant frequency point (f0) is proposed. First, the synchronous rectifier (SR) gate driving signals are well tuned with proposed universal adaptive SR driving scheme by eliminating the body diode conduction. Then, the novel pulse width locked loop with digital implementation is presented to minimize the pulse width difference...
In this paper, a novel burst mode control solution for LLC resonant converters is proposed for the highest efficiency and small output voltage ripple. The burst time is set to be constant, the off time is modulated by load conditions. During the burst time, three pulse switching pattern is implemented to keep output voltage low frequency ripple minimal. The switch first turned on is controlled to...
The LLC resonant converter topology enables high DC-DC conversion efficiency and has been recently adopted for power supplies in several application areas. In this paper a method for overcurrent protection of the LLC resonant converter is proposed, which avoids a reduction of the hold-up time resulting from the application of the protection scheme. The discussion covers the operation principle, design...
Conventional voltage mode control only offers limited performance for LLC series resonant dc-to-dc converters experiencing wide variations in operating conditions. This paper presents current mode control which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current...
This paper improves the design of a previously proposed multiple-input SEPIC by providing bi-directional power flow capabilities in order to integrate energy storage devices with distributed generation sources. In this work an ultra-capacitor bank is considered as the multiple-input SEPIC energy storage input and auxiliary power source. When the main source generates enough power to regulate the output...
A multiple-input current-source converter for a stand-alone hybrid power system is proposed. As the power rating increases, isolated multiple-input converters may have limited efficiency caused by power losses from their coupled-inductor or transformer leakage inductance. This paper discusses a multiple-input circuit topology suitable for hybrid renewable energy applications, such as photovoltaic,...
This paper focuses on photovoltaic systems with multiple parallel-connected panels. It is shown that distributed MPPT must be performed on each panel to maintain maximum power harvesting in partial shading conditions. This is especially true for PV systems made with panels having different electrical parameters. The multi-input, single-output (MISO) dc-dc converter provides a low-cost implementation...
In this paper a three-level single-stage power-factor-corrected ac/dc converter is presented. The proposed circuit integrates the operation of the boost power factor correction and the three-level dc/dc converter, and mitigates the drawbacks found in previously proposed two-level single-stage voltage-fed converters. In the paper, the operation of the new converter is explained in detail, its steady-state...
This paper describes a boost power factor corrector (PFC) with high power factor at low load or high mains voltage. The power factor is improved by compensating the current of the EMI filter after the bridge rectifier so that the current drawn from the mains deviates less from the desired shape. This compensation is realized by controlling the current distribution of the boost converter over each...
In this paper, a two-stage AC/DC converter is presented for a low-profile laptop adaptor. The system consists of a boost power factor preregulator and LLC resonant converter. The preregulator features high PF and high-efficiency, while secondary LLC converter features zero voltage switching (ZVS). The transformer in LLC converter is splited in two to reduce current stress and converter height. The...
In high voltage AC input applications, buck PFC has the advantage of outputting a lower level voltage. This paper presents a variable on-time control buck PFC front-end for high-brightness light-emitting-diode (HB-LED) application, the function of the switch on-time in a half-line cycle is derived. Most high-order harmonics are lowered comparing to the constant on-time control in order to comply with...
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