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This paper proposes a single-stage, high-power-factor LED driver with zero-voltage-switching (ZVS) and current-sharing features. A buck-boost typed power-factor corrector (PFC) is integrated with an LLC resonant dc-dc converter to form the presented circuit. Both the active switches can turn on with ZVS, and both the output rectifier diodes can turn off with zero-current-switching (ZCS). The current...
This paper proposes a single-stage high-powerfactor LED driver with coupled inductors for street-lighting applications. The presented LED driver integrates a dual buck-boost power-factor-correction (PFC) AC-DC converter with coupled inductors and a half-bridge-type LLC DC-DC resonant converter into a single-stage conversion circuit topology. The coupled inductors inside the dual buck-boost converter...
This paper proposes a novel interleaved single-stage LLC resonant ac-dc converter. Two derivative buck-boost typed power-factor-correctors (PFCs) with interleaved operation are integrated with an LLC resonant converter to form the presented circuit. The proposed single-stage converter has the features of simple circuit structure, balance switch currents, low dc-bus voltage, low input current harmonics,...
An LLC resonant converter has been used to provide the electrical characteristics of solar arrays. In this paper, its small signal model is derived based on the extended describing function concept. The corresponding frequency response can be easily obtained from IsSpice simulation of the equivalent circuit model. Furthermore, a closed-loop compensation controller is designed according to the derived...
Due to the advantages of low switching loss and high efficiency, LLC resonant converters have been widely used. Based on the extended describing function concept, the small-signal model of an LLC resonant converter is derived in this paper. The equivalent circuit of small-signal model is illustrated so that the corresponding frequency response can be easily obtained by using Is Spice simulation. The...
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