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一种基于新型单级交直变换器的两级LED路灯照明系统

, PP. 423-429

Keywords: 单级,AC-DC,LED,Sepic,Flyback,准谐振

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Abstract:

一种两级路灯照明系统,其前级为基于Sepic电路和反激变换器的单级交直变换器。由于Sepic电路与反激变换器共用一个开关器件,降低了系统的成本,提高了系统的效率和可靠性。同时由于此开关管工作在准谐振状态,减小了系统的开关损耗,提升了系统的效率。后级为LED恒流电路,采用了峰值电流控制模式的Boost电路来实现恒流控制。在实验中,制作了一100W样机,印证了分析的正确性,前级工作在软开关状态下,系统在满载状态下整机效率高达83%。

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