ABSTRACT This paper proposes quadratic-like single-ended primary inductance converter (SEPIC) converter, a DC/DC converter suitable for wide-input voltage range. This circuit can be gated at higher duty ratio compared with conventional SEPIC converter, while the voltage conversion ratio is low. This feature is beneficial for high-input voltage because it prevents the controller from falling into extremely low duty ratio limitation. A prototype circuit is implemented with Pulse-Width-Modulation (PWM) control to drive the Light emitting diode (LED) strings for demonstration of the circuit application. Recent studies have advocated LEDs as efficient and durable technology for lighting applications. A stabilized output converter is required to regulate the current flowing through the LED lamp. The dimming control of the LED light output is implemented by the controller. This converter can be powered from either a 24-Vdc battery or from the universal AC input voltage (up to 360 Vdc). Such a wide-input voltage application can be found in emergency lighting in which the light is possibly powered either from battery or AC input voltages. Experimental results prove the feasibility of the circuit topology and theoretical analysis.

中文翻译：

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基于QL-SEPIC转换器的大范围可调光LED照明

摘要 本文提出了类似二次方的单端初级电感转换器 (SEPIC) 转换器，一种适用于宽输入电压范围的 DC/DC 转换器。与传统的 SEPIC 转换器相比，该电路可以在更高的占空比下进行门控，而电压转换比较低。此功能有利于高输入电压，因为它可以防止控制器陷入极低的占空比限制。原型电路采用脉宽调制 (PWM) 控制来驱动发光二极管 (LED) 串，用于演示电路应用。最近的研究提倡将 LED 用作照明应用的高效和耐用技术。需要一个稳定的输出转换器来调节流过 LED 灯的电流。LED 光输出的调光控制由控制器实现。该转换器可由 24 Vdc 电池或通用交流输入电压（高达 360 Vdc）供电。这种宽输入电压应用可以在应急照明中找到，其中灯可能由电池或交流输入电压供电。实验结果证明了电路拓扑和理论分析的可行性。