Abstract
This article develops an advanced self-protected single-stage ac-dc LLC resonant converter, in which one diode is introduced to realize overvoltage prevention to achieve self-protection, lower costs, and smaller size. Besides, the proposed converter can also realize power factor correction (PFC), soft switching, and a wide output voltage range, which meets the needs of many applications, such as liquid crystal display (LCD) TV power supply. Detailed analyses are presented to well demonstrate the features of the proposed converter, including the PFC and zero voltage switching turn-on functions. Thereafter, closed-loop control and parameter matching design are conducted in this study. Lastly, prototype experimentation of 220-V ac, 200 W verifies the effectiveness of the proposed converter design.
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