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Dimmer for LED retrofit using current reduction.

机译：调光器，用于通过降低电流实现LED改造。

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摘要

The main purpose of this research is to design a dimmer circuit that can either be fitted with the LED itself or embedded in the switch, using the available infrastructure, such as the wiring and circuitry, thus adding new technology to older systems. The main intention in doing so is to increase energy efficiency and decrease energy consumption with the least possible expenditure. The LEDs are in theory fully dimmable but are not compatible with all dimmer controls designed for the other lighting technologies. Therefore, it is necessary that a dimmer circuit be designed in order to use them as retrofits. This dimmer design is based on the working of a resonant converter. The circuit is run at resonant frequency as maximum current passes through the load at this frequency and decreases on moving farther away. It also uses capacitors in conjunction with high frequency AC in order to balance the current in the LEDs. The LED driver circuit is based on a current-fed push-pull resonant converter. The driver circuit contains two transistors which are switched on alternatively at the resonant frequency of the circuit, thus generating the required high frequency efficiently. The two transistors are driven alternatively in a self-oscillating mode. The input to the converter is supplied through a DC rectifier with a bulk capacitor as a filter. A relatively large inductor is placed in between the rectifier and the resonant converter, in order to provide the required current supply to the converter. The brightness of the LED depends on the current passing through it and as maximum current is rendered through the load in a resonant converter, it glows at maximum brightness. On changing the frequency, the current through the load changes, thereby changing the brightness of the LED.
机译：这项研究的主要目的是设计一种调光器电路，该电路可以使用现有的基础设施（例如布线和电路）安装到LED本身或嵌入到开关中，从而为旧系统添加新技术。这样做的主要目的是以尽可能少的支出提高能源效率并减少能源消耗。理论上讲，LED是完全可调光的，但与为其他照明技术设计的所有调光器控件不兼容。因此，有必要设计调光器电路以将其用作改型。这种调光器设计基于谐振转换器的工作原理。该电路以谐振频率运行，因为最大电流以该频率流经负载，并随着距离的增加而减小。它还使用电容器和高频AC来平衡LED中的电流。 LED驱动器电路基于电流馈送的推挽谐振转换器。驱动电路包含两个晶体管，它们以电路的谐振频率交替导通，从而有效地产生所需的高频。两个晶体管以自激模式交替驱动。转换器的输入通过带有大容量电容器作为滤波器的直流整流器提供。相对较大的电感器放置在整流器和谐振转换器之间，以便向转换器提供所需的电流供应。 LED的亮度取决于通过它的电流，并且当最大电流通过谐振转换器中的负载提供时，它以最大亮度发光。改变频率时，通过负载的电流会改变，从而改变LED的亮度。

著录项

  • 作者

    Javvadi, Monica.;

  • 作者单位

    Northern Illinois University.;

  • 授予单位 Northern Illinois University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2011
  • 页码 50 p.
  • 总页数 50
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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