Quasi-constant bus voltage CrCM boost PFC fed LLC resonant converter in high power LED lighting systems,International Journal of Circuit Theory and Applications

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Quasi-constant bus voltage CrCM boost PFC fed LLC resonant converter in high power LED lighting systems
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2021-02-17 , DOI: 10.1002/cta.2965
Somnath Pal ₁ , Bhim Singh ₁ , Ashish Shrivastava _{1,

2}

Affiliation

This paper deals with a two-stage LED (light emitting diode) driver on the basis of front-end boost converter operating in critical conduction mode (CrCM) and second stage LLC resonant converter for driving an LED lighting load. The boost converter operates in the valley switching mode to reduce switching power loss with less component stress. The ZVS (zero voltage switching) operation of both the half-bridge semiconductor switching devices reduces the switching losses, which improves the system efficiency. Moreover, to ensure the stability of the DC-bus voltage, state-space analysis is also carried out for the CrCM boost converter. The first stage provides the power factor correction (PFC) over the universal AC mains and maintains a constant DC-bus for the next stage. The second-stage converter maintains a ripple-free output voltage to an LED load. This circuit has reasonably minimized the design complexity as compared with single-stage variable DC-bus PFC integrated resonant converters and also gives improved efficiency in an isolated configuration. In order to validate the system, a 150-W prototype is investigated, and experimental findings are analyzed in-line with theoretical results at universal AC mains.

中文翻译：

准恒定总线电压 CrCM 升压 PFC 馈电 LLC 谐振转换器在大功率 LED 照明系统中

本文讨论了基于在临界导通模式 (CrCM) 下运行的前端升压转换器和用于驱动 LED 照明负载的第二级 LLC 谐振转换器的两级 LED（发光二极管）驱动器。升压转换器在谷底开关模式下运行，以减少开关功率损耗，同时减少元件应力。两个半桥半导体开关器件的 ZVS（零电压开关）操作降低了开关损耗，从而提高了系统效率。此外，为了确保直流母线电压的稳定性，还对 CrCM 升压转换器进行了状态空间分析。第一级通过通用交流电源提供功率因数校正 (PFC)，并为下一级保持恒定的直流母线。第二级转换器维持LED负载的无纹波输出电压。与单级可变直流总线 PFC 集成谐振转换器相比，该电路合理地最大限度地降低了设计复杂性，并且还提高了隔离配置的效率。为了验证该系统，我们对 150 W 原型进行了研究，并根据通用交流电源的理论结果分析了实验结果。

更新日期：2021-02-17

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