Electrodeless Fluorescent Lamp Research Articles

Feasibility Study of Electrodeless Fluorescent Lamps for Outdoor Signal Applications

Feasibility Study of Electrodeless Fluorescent Lamps for Outdoor Signal Applications

自励式無電極ランプ点灯回路における調光手法

自励式無電極ランプ点灯回路における調光手法

10MHz級自励式無電極ランプ点灯回路の検討

10MHz級自励式無電極ランプ点灯回路の検討

Design of a 2.5-MHz, soft-switching, class-D converter for electrodeless lighting

The electrodeless fluorescent lamp offers a long-life, efficacious alternative to conventional reflective lighting, but the ballast design is formidable due to the interaction between the lamp and ballast. The interaction exists for two reasons. First, the arc resistance is highly dependent upon the power density. Second, the output power of the resonant converter is a strong function of the load resistance. Soft switching, essential to the efficient and reliable functioning of the power converter, complicates the design process. This paper presents a robust design methodology, via nonlinear programming (NP), where the transition interval and midpoint capacitance are critical elements of the solution. Analytical expressions are offered as ingredients of the parameter optimization. Minimizing the RMS current flow through the active switches yields peak efficiency. In this case, the converter operates with zero-voltage switching (ZVS) and zero-current switching (ZCS), with nonzero values of midpoint capacitance. Excellent agreement between the analytical and physical models was achieved. The efficiency of the physical model was found to exceed 90%.

無電極蛍光ランプにおける青色蛍光体の劣化検討

無電極蛍光ランプにおける青色蛍光体の劣化検討

無電極蛍光ランプの光束劣化データの解析

無電極蛍光ランプの光束劣化データの解析

零電圧スイッチングインバータによる無電極ランプ点灯回路の動作解析

零電圧スイッチングインバータによる無電極ランプ点灯回路の動作解析

無電極蛍光ランプにおける調光方法の一検討

無電極蛍光ランプにおける調光方法の一検討

無電極蛍光ランプの光束劣化原因の検討

無電極蛍光ランプの光束劣化原因の検討

Electronic Lighting System for HID Lamps and Lighting Unit for Electrodeless fluorescent Lamps

Electronic Lighting System for HID Lamps and Lighting Unit for Electrodeless fluorescent Lamps

Development of the Electrodeless Fluorescent Lamp

Development of the Electrodeless Fluorescent Lamp

Light Generator for Various Waveform

Experimental equipment by which various waveform of light can be generated has been developed for the psychophysical research on human visual temporal characteristics. For the light source of the equipment, electrodeless fluorescent lamps using short persistence phosphors driven by UHF electromagnetic wave are employed. The various waveform consisting of sequential short light pulses of more than 250 microseconds long, is generated by a typical feedback control in which the waveform of the UHF signal is modified temporally, based on the result of the sequential comparison between the measured intensity of the light output from the fluorescent lamps and the value of the waveform data. With the above mentioned control technique, the performance of the system realized is: circular light stimuli of 200mm diameter, the maximum luminance of 2000 cd/m2; the luminous uniformity, 0.8 (minimum/maximum); light color of white (correlated color temperature 5400K).

Comparison of Technologies for New Energy-Efficient Lamps

Energy-efficient light bulbs are being developed to replace the incandescent lamp where they can satisfy the design criteria and be used in'sockets that have long hours of annual use. The four technologies discussed include the compact fluorescent lamp, coated-filament lamp, electrodeless fluorescent lamp, and ' compact high-intensity discharge lamp. The systems demonstrate efficacy improvements of two to four times that of their incandescent counterparts. These new lamps have required considerable advances in lamp technology. They offer the potential for achieving efficacies close to 80 Im/W. These new lamps will reduce the energy used annually by incandescent lamps (190 billion kWh) by more than 50 percent in the 1990' s, at which times they will be commonly employed.