Single-Stage Three-Phase AC-DC Resonant Switched Capacitor LED Driver Without Electrolytic Capacitor and Reduced Number of Controlled Switches

Miranda, Pedro Henrique Almeida; Mineiro, Edilson; Rodrigues, Franscico Wesley G.; Antunes, Fernando Luiz Marcelo

doi:10.1109/tcsi.2020.3017412

Cited by 10 publications

(1 citation statement)

References 33 publications

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“…Because the value of the secondary leakage inductor is very small, its influence is negligible in the analysis. Then, using the same FHA method, the voltage gain can be calculated as follows [26–28]:

\begin{matrix} true \\ right (||, M false(x, k, Q false)) = \frac{1}{2} \cdot \frac{1}{\sqrt{{([], 1 + \frac{1}{k} \cdot (1 - \frac{1}{x^{2}}))}^{2} + Q^{2} \cdot {(x - \frac{1}{x})}^{2}}} \end{matrix}

…”

Section: Design Considerations and Discussionmentioning

confidence: 99%

A single‐stage bridgeless LLC resonant converter with constant frequency control based LED driver

Sun

2021

IET Power Electronics

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In this article, a single‐stage bridgeless LLC resonant converter with a constant frequency control method is proposed for a high‐brightness light‐emitting diode (LED) driver. LED strings require drivers with high power density and high efficiency. This article presents a novel LED driver circuit topology based on switch integration and the switching controlled capacitor (SCC) technique. By combining the merits of a totem‐pole bridgeless boost PFC unit and a high frequency SCC‐LLC half‐bridge resonant converter, the proposed topology can achieve high efficiency. Due to the SCC‐LLC circuit topology structure, constant frequency control of the LLC resonant converter is achieved by the regulation of the equivalent resonant capacitance. The proposed novel LED driver topology can automatically achieve soft‐switching characteristics and a high power factor. The operating principle of different operation modes and the characteristics of the proposed LED driver are analysed in detail. Finally, to demonstrate the feature of the proposed topology, a 100 W/70 V laboratory prototype is built. The satisfactory experimental results correspond with the theoretical analysis and parameter design.

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