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Design and Implementation of High Power LED Lighting System for Health Care Applications

机译：用于保健应用的高功率LED照明系统的设计与实现

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Background: A conventional front-end rectifier causes line current distortion and reducesthe power factor, which result in lowering power quality for Light Emitting Diode (LED)drive system. Hence, this paper projects the design, simulation and comparison of novel PI tunedby the fuzzy logic controller with the conventional PI controller for modified SEPIC rectifier toproduce the required load voltage along with supply-side unity power factor and less distortedsupply current with limited harmonic content for LED lighting in healthcare applications. A prototypeof 100W, 48V LED driver was developed for testing the performance of the controller.Methods: This paper presents the modified SEPIC LED driver with PI integrated fuzzy andclassical PI for controlling voltage. For controlling source current, classical PI is chosen. Both areequipped with the modified SEPIC rectifier. Both conventional PI control and novel fuzzy tunedperformances were compared.Results: The proposed control topology operated modified SEPIC rectifier was analyzed and thecorresponding power factor and THD were measured. The operational evaluation of the proposedLED driver using fuzzy tuned-PI/PI controller combinations for different output power is providedin Table 2. Sustained regulated DC voltage of 48V was achieved even when the load resistancevaried within a specific range. Power factor of 0.9995, which is close to unity, was also achieved.The relative analysis was made with conventional PI and trendy PI integrated FLC controllerwhich is provided in Table 3. The usage of PI integrated fuzzy logic controller minimized the peakovershoot to be around 1.3% and rise time of 0.5s which are lower when compared to theconventional PI controller. With reference to Fig. (8a), the source current THD of theconventional PI controller was observed to be around 7.39%. Having PI integrated FLC, THD wasfurther reduced and for rated load, it was found to be 1.39%. The power factor of the conventionalPI controller is around 0.9974. PI integrated fuzzy logic controller improved the power factor to0.9995 with fuzzy tuned PI controller in action as shown in Fig. (8b). A prototype of 100W, 48VLED driver was developed for testing the performance of the controller. A power quality analyserwas employed for measuring power factor and THD, shown in Fig. (10a). 3.633% of harmonicdistortions at the source current and 0.9980% of input power factor was achieved for rated loadpower. 4.510% of supply current THD with 0.9931% input power factor was achieved for lowload power.Conclusion: This manuscript suggests a modified single switch SEPIC LED driver for 48V outputoperated healthcare equipment. Simulation study of this driver shows the better performance. Inorder to analyze the performance, a comparative study was conducted by using the classical PIand the novel PI integrated fuzzy controller. Satisfactory results regarding enhanced quality ofpower, regulated load voltage, quick rise time and settling time were achieved. The source currentTHD has been reduced to around 1.39% which is less than 5% as per the IEEE-516 prescribedstandard and the power factor has been improved to 0.9995 by implementing the fuzzy tuned PIcontroller. The above results favor the suggested modified SEPIC LED driver for practicalhealthcare applications.
机译：背景：传统的前端整流器导致线电流失真和Reducesthe功率因数，导致发光二极管（LED）驱动系统的功率质量降低。因此，本文将新型PI调谐的设计，仿真和比较，具有用于改进的SEPIC整流器的传统PI控制器，以及供应侧统一功率因数以及具有有限谐波含量的电流较小的电流较低的电流Healthcare应用中的LED照明。开发了一个原型100W，48V LED驱动器，用于测试控制器的性能。方法：本文提出了具有PI集成模糊和化学PI的改进的SEPIC LED驱动器，用于控制电压。为了控制源电流，选择古典pi。两者都与修改过的SEPIC整流器均匀。比较了传统的PI控制和新型模糊调节性申请。结果：分析了所提出的控制拓扑经营改性的SEPIC整流器，并测量相应的功率因数和THD。利用针对不同输出功率的模糊调谐PI / PI控制器组合的建议驾驶员的操作评估是表2的2.即使在特定范围内的负载受阻变动时，也实现了48V的持续调节直流电压。还实现了0.9995的功率因数，即靠近统一。在表3中提供了用传统的PI和时尚PI集成FLC控制器进行的相对分析。PI综合模糊逻辑控制器的使用最小化了截止峰穴至约1.3与Theconventional PI控制器相比，0.5s的0.5s的％和上升时间。参考图1。（8A），观察到强核PI控制器的源电流THD为约7.39％。具有PI集成FLC，THD还原和额定载荷，它被发现为1.39％。传统的PI控制器的功率因数约为0.9974。 PI集成模糊逻辑控制器通过模糊调谐PI控制器改进了功率因数TO0.9995，如图2所示，具有模糊调谐PI控制器。（8B）。开发了100W，48级驱动器的原型，用于测试控制器的性能。用于测量功率因数和THD的功率质量分析器，如图2所示。（10A）。为额定负载功率达到了3.633％的源电流和0.9980％的输入功率因数的0.9980％。 4.510％的电源电流THD具有0.9931％的输入功率因数，为低载电源实现。结论：该手稿建议为48V批量的医疗保健设备进行改进的单开关SEPIC LED驱动器。该驱动程序的仿真研究显示了更好的性能。为了分析性能，采用古典钢琴新型PI集成模糊控制器进行比较研究。达到了令人满意的结果，达到了强大的功率，调节负载电压，快速上升时间和稳定时间。根据IEEE-516规定的标准，源电流降低到大约1.39％的比率小于5％，通过实施模糊调谐的微微控制器，功率因数已经提高到0.9995。上面的结果有利于建议的修饰的SEPIC LED驱动器，用于实用安全应用。

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