Input voltage controlled full‐bridge series resonant converter for LED driver application

Kolla, Hemasundara Rao; Vishwanathan, N.; Murthy, Bhagwan K.

doi:10.1049/iet-pel.2020.0554

Cited by 10 publications

(1 citation statement)

References 25 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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\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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A single-stage variable output AC-DC converter with PFC and soft-switching for renewable energy integration

Zandabad,

Fazel

2024

Energy Reports

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Wide voltage gain isolated LCC resonant converters for LED driver applications

Askari,

Molavi,

Farzanehfard

2024

IET Power Electronics

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This article proposes an isolated high‐efficiency resonant LED driver with wide‐input voltage range. The proposed converter is developed by integrating LCC resonant converter and buck‐boost converter. In this topology, the LCC network provides many features including the integration of buck‐boost filter inductor and the transformer magnetizing inductance. In addition, the LCC network provides zero voltage switching (ZVS) operation of the main switches and zero current switching (ZCS) operation of the rectifier diodes over a wide variation of duty cycle operation. Also, load‐independent output current characteristic with improved efficiency is obtained at the resonant frequency operation which is well‐suited for LED applications. Other topology variations of the proposed converter generating step‐up and step‐down voltage gains are introduced for applications with different input voltage ranges. To validate the theoretical analysis and LED driver operation, a 50 W laboratory prototype of the proposed LED driver is implemented for the wide input voltage of 18–40 V to deliver 500 mA output current to a string of 1–30 LEDs, which corresponds to an output voltage range of 3.3–100 V.

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Input voltage controlled full‐bridge series resonant converter for LED driver application

Cited by 10 publications

References 25 publications

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

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

A single-stage variable output AC-DC converter with PFC and soft-switching for renewable energy integration

Wide voltage gain isolated LCC resonant converters for LED driver applications

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