As early as more than a century ago, people have begun to study the phenomenon of electrodeless discharge. In 1907, the first infinity lamp was patented. In recent decades, many companies and scientific research institutions at home and abroad have invested a lot of energy to study the electrodeless lamps, so the related results are also endless. This article will elaborate and discuss the development of the electrodeless lamp. Review: The quiet rise of the so-called induction lamp, as the name suggests, is the lamp without electrodes. The main advantage of this type of lamp is that it eliminates the key factor that limits the life of traditional light sources - the electrodes. In an ordinary light source, as the light is ignited, the electron-emitting material on the filament is continuously consumed, and the electron-emitting capability of the electrode is gradually lowered. At the same time, some electrode material is also sputtered onto the inner wall of the tube. This causes difficulty in starting the lamp at the end of the ignition point, and the lumen output is also greatly reduced. Moreover, the electrons emitted by the electrodes at the operating voltage are insufficient to sustain the discharge and the lamps are extinguished. In contrast, the electrodeless lamp, due to the elimination of the influence of the electrode factor, can greatly improve the life of the lamp, and the lumen maintenance of the lamp is much better than the traditional lamp source. In the near future, with the development and advancement of electronic technology, there will be more high-quality and low-cost components and electronic circuits with special functions suitable for the electrodeless lamp. Therefore, we have reason to expect that the induction lamp will replace the traditional light source, and the commercial production of the first glare lamp, which becomes the illumination source, can be traced back to 1991, when Panasonic Corporation of Japan introduced an induction lamp in Japan. It works by using the H-discharge principle. An air core induction coil is wound around the equator at the equator, and a ballast is built in. It operates at 13.56 MHz. For a 27 watt lamp, the operating voltage is 100 volts AC, and the corresponding lumen output is 1000 lumens. Therefore, the luminous efficiency is 37.0 lumens per watt. And its average life expectancy is as high as 40,000 hours. In order to prevent electromagnetic interference, the lamp is also covered with a metal cover. Almost at the same time, in 1991, the Dutch company Philips also introduced an induction lamp, which is called "QL electrodeless lamp". The structure is such that a field coil is wound around a rod core, the bulb of the lamp is sealed, and one end of the lamp is recessed, and the core around the coil can be inserted into the recess on the bulb. At the same time, in order to solve the heat dissipation problem, a heat pipe is arranged on the iron core. There are two main amalgams in the blister, and the secondary amalgam is responsible for providing a suitable mercury vapor pressure at the start of the lamp, so that the lamp can reach a relatively high lumen output in a short time; and the effect of the main amalgam is It is to keep the mercury vapor pressure in the bulb in the optimal range when the lamp is working. This lamp operates at a frequency of 2.65 MHz. A 55-watt QL lamp has an optical output of 3,500 lumens (light efficiency of 63.5 lumens per watt); and an 85-watt lumen output of 6000 lumens. (Light efficiency is 70.6 lumens / watt); lamp life is up to 60,000 hours. In 1994, GE Corporation of the United States introduced an integrated compact induction lamp. This type of lamp can be used in conjunction with a reflector of an incandescent lamp to form a structure similar to a PAR lamp. The principle and structure are similar to those of Philips' QL lamps. They also utilize rod-shaped core excitation coils; the operating frequency is also 2.65 MHz. With an input power of 23 watts, its lumen output is 1100 lumens and the efficacy is 48 lumens per watt. The average life expectancy is around 15,000 hours. In the late 20th century, Osram in Germany also launched its own induction lamp product, whose model is located in ENDURA. Unlike GE and Philips' induction lamps, Osram's electrodeless discharge tubes are rectangular in shape. Each of the short sides of the rectangle has a core with an induction coil wound thereon. When a current flows through the coil, a magnetic field is induced in the core, thereby coupling energy into the discharge tube to cause the lamp to illuminate. A 70-watt lamp with a luminous output of 5,600 lumens and a luminous efficacy of up to 80 lumens per watt; its lifetime is 60,000 hours and can be activated immediately after a power failure. Its light color is both warm white and daylight, and its color rendering is between 80 and 85. In recent years, many domestic enterprises are also developing and producing electrodeless lamps. The structure and shape of LVD induction lamps produced by Shanghai Hongyuan Lighting Appliance Co., Ltd. are similar to those of OSRAM, but their key core technologies have their own intellectual property rights. In addition to the rectangular shape, the shape of the arc tube has a ring shape and Other shapes, and the price is more competitive in the market and popularized and applied. The multi-amalgam solution is used in the Hongyuan LVD induction lamp. In terms of photoelectric parameters, Hongyuan's LVD induction lamp has a minimum power of 15 watts and a maximum of 300 watts; the lamp operates at a frequency of 210 kHz and operates at a voltage of 100 volts to 270 volts; the luminous efficacy of the lamp is 80 lumens/ Tile, color rendering is above 80; can be dimmed and digital remote control work; working life is up to 10 years. The main technical parameters of Hongyuan LVD induction lamp and the comparison of other foreign company products are listed in the attached table.
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