Main features of 1 double circular fluorescent lamp The double-ring fluorescent lamp is a high-frequency fluorescent lamp that connects two 20mm thin-diameter glass tubes together using a bridge technique. The characteristics of the lamp are explained below. 1 1 discharge tube length The brightness of the fluorescent lamp has a great relationship with the length of the discharge tube (the length of the discharge arc), and the longer the discharge tube, the higher the brightness of the light. Since the double-ring fluorescent lamp is connected by two annular discharge tubes, its discharge length is about twice that of a single circular fluorescent lamp of the same lamp radius (see 2). Comparison of structure between 2 double circular fluorescent lamps and single circular fluorescent lamps 1 2 pipe diameter Due to the use of a 20 mm thin-diameter glass tube, the discharge current is small, causing the lamp voltage to rise. However, an increase in the lamp voltage does not increase the electrode drop, and an increase in the lamp voltage associated with the luminescence can improve the luminous efficiency. 1 3 high temperature at the cold end The double-circular fluorescent lamp adopts the bridge technology, and the side end of the bridge portion serves as a cold end for controlling the vapor pressure of mercury. Previously, circular fluorescent lamps were generally designed to achieve a maximum light output at an ambient temperature of 25, while double-circular fluorescent lamps have a maximum light output at ambient temperature of 40 and the highest brightness. Therefore, the lamp can also ensure high brightness when it is started at a high temperature, and a higher illumination can be obtained when a box-shaped or thin sealed lamp is used (see 3). That is to say, the double-circular fluorescent lamp is a light source designed with full consideration of the working state of the lamp. 3 comparison of ambient temperature characteristics and lamp structure Because of the above advantages of the double-ring fluorescent lamp, the overall efficiency of the lamp can be more than 100lm W. 4 is a comparison of the luminous flux of a double-ring fluorescent lamp (100W) and a conventional ordinary ballast lamp (30W 4ç›) under the same electrical energy consumption. 4 Comparison of luminous flux when power consumption is the same Advantages of 2 double circular fluorescent lamps Despite the high brightness and high efficiency of double-circular fluorescent lamps, as the lifestyle of people changes, the requirements for the lamps are becoming more diverse. A questionnaire survey of lighting needs for 200 respondents. Among them, the need to adjust the indoor atmosphere is the largest (32), followed by the design style of the luminaire (16), energy saving (11), easy maintenance and replacement (11), and improved brightness (8). Therefore, lamps with new functions and new design styles that meet the needs of the market are being actively developed and gradually commercialized. The advantages of double-ring fluorescent lamps in these areas are described below. 5 Survey results on lighting needs (N=200) 2 1 continuous dimming function From the survey results, up to 32 can adjust the indoor atmosphere demand, lighting equipment that can adjust the light output according to people's various daily life environment will have a good development prospect. Fluorescent electronic ballasts with continuous dimming have been developed (dimming range is approximately 10 100). 6 is the basic circuit structure diagram of the ballast. For a double-circular fluorescent lamp, such a light source with a small diameter and a high lamp voltage, the lamp voltage may rise sharply during dimming, and it is difficult to make the lamp stabilize the ignition point or to cause the lamp to be extinguished and flicker. In order to avoid these phenomena, a feedback control method is adopted in the double-ring fluorescent lamp ballast, which feeds back the value of the normal light output and adjusts the oscillation frequency of the inverter according to the required light output of the dimming signal, thereby Achieve stable dimming. Moreover, continuous brightness adjustment or arbitrary brightness switching from 100 to about 10 can be completed by a dedicated remote control, and the operation is very simple. This continuous dimming function, adjustable to low illumination, allows the user to easily create a comfortable light environment (timely and light) based on the indoor living style. If used in conjunction with other lighting equipment such as floor lamps, it can also add decorative effects to the room. Moreover, dimming avoids unnecessary waste of electric energy and is in line with the trend of energy saving. It is the relationship between the ratio of dimming and the proportion of power consumption. It can be seen from the above that when dimming to about 10, the power can be saved by about 80 compared to 100 light output. 2 2 design features of the luminaire In the previous survey, the design requirements of the luminaires ranked second (16), and it is obvious that the style of the luminaires is also important when selecting lamps. In recent years, more and more people prefer lamps that make the room look more spacious and tidy, so thin and flat luminaire designs with small ceiling spacing are favored. Since the double-circular fluorescent lamp uses a 20mm thin-diameter glass tube, it is easy to use a thin-type luminaire, and a ceiling luminaire having a luminaire thickness of less than 100 mm has been developed (see 8). A new ceiling luminaire made of a transparent resin material that appears to be suspended below the ceiling has also been developed (see 9). Since the main body of the lamp has a certain distance from the ceiling, it is possible to obtain superimposed light of direct light emitted from the light source and light reflected by the ceiling or the wall (indirect light), which makes the vertical illuminance reflecting the brightness and openness of the room and The ratio of horizontal illuminance is increased, which increases the brightness of the ceiling of the traditional ceiling-mounted ceiling fixtures by about 25, and makes the room feel comfortable. In the past, in order to achieve proper lighting effects on both the ground and the wall, a one-bedroom multi-lamp was usually used. Now, only one new ceiling lamp can be used in one room. 2 3 luminaire efficiency improvement Energy saving and brightness improvement are eternal development issues for lighting equipment. The double-circular fluorescent lamp has been introduced in the foregoing for its energy saving and brightness advantages, and now it has successfully developed a high-efficiency luminaire with this light source. Extending the distance between the tube and the body of the luminaire is an effective way to improve the efficiency of the luminaire. However, in the past, the electronic ballast was installed directly under the lamp tube, and in order to make a thin lamp, the distance between the lamp tube and the main body of the lamp was small, so that the light utilization rate reflected on the main body became poor, causing the light emitted by the lamp. Reduced efficiency. Now, the electronic ballast is installed on the inner side of the inner ring lamp of the double-ring fluorescent lamp. This high-density lamp structure design ensures a certain distance between the lamp and the main body of the lamp. In order to make the light emitted by the lamp efficiently reflected through the interior of the lamp and then hit the outside of the lamp, an R-shaped high-efficiency reflector (see 10) is designed and used to improve the efficiency of the lamp. Moreover, in the compact design of the electronic ballast, the layout of the heat-generating components, the heat dissipation structure, and the like have been rationalized in terms of preventing the temperature rise of the electronic components. 2 4 voice prompt function It is predicted that by 2015, the number of people over the age of 65 in Japan will account for 14% of the total number of nationals. Therefore, it can be speculated that the market demand for lighting devices that can be easily maintained and replaced (11) will be further expanded. In this ageing society, there are many products that are easy to maintain, such as a double-circular fluorescent lamp with a voice prompt function, which reminds the user of the time to change the lamp before the lamp needs to be replaced. With traditional fluorescent lamps, people are only ready to change lights when the lamp is extinguished or not activated, which is inconvenient because the lamp can not be known in advance. Therefore, a voice prompt function is added to the luminaire, and when the accumulated flash time of the lamp in the memory reaches the preset life value, a voice prompt is issued. 11 gives the relationship between the cumulative ignition time of the double-ring fluorescent lamp and the luminous flux maintenance rate. When there is still about 300h from the rated life of the double-ring fluorescent lamp (12 000h), the brightness of the fluorescent lamp in the lamp will start to decrease after the lamp is turned on. It is recommended that you prepare a message for replacement. In the next 300h, the fixture will repeat the same prompt 4 times. Therefore, the user can prepare a new lamp in advance before the lamp is extinguished or not started, which is convenient for the user to use. At the same time, this kind of voice prompt also plays a role in energy saving because the lamp that attenuates the luminous flux due to aging is wasted. 11 The relationship between the cumulative ignition time and the lumen maintenance rate In addition to the replacement time in the voice function, there is also an informational message about the energy saving rate. When the illuminator is dimmed using the remote control, the luminaire will emit an energy saving rate corresponding to the set brightness (the percentage of the current brightness can be saved compared to the power consumption at 100 brightness). For example, when the brightness lower limit value (about 10 brightness) is adjusted, a voice prompt of about 80 energy saving is issued. Informing the user of the specific value of the energy saving rate can enhance the user's awareness of energy conservation. In this luminaire with voice prompts, there is a remote light receiving module, 12 is its internal structural block diagram. The control microprocessor is responsible for accumulating the ignition time, remote signal processing, and outputting commands for the voice microprocessor. Moreover, the power supply in the remote control light receiving module is also provided internally by the electronic ballast, which improves synchronization and reduces cost. Ceiling lamps are generally closed lamps with a ball mask. The sound emitted from the inside is not clear or the volume is too small. In addition, the temperature rise inside the lamp when the lamp is started is also very unfavorable for the use of the speaker. Functional remote control light receiving module structure diagram This is a reasonable design of the speaker cover according to the use environment and the volume required to clearly hear the prompt. 2 5 Environmental protection Double-ring fluorescent lamps not only have the advantages of energy saving, flexible control, and strong design, but also have advantages in environmental protection and recycling: the steel plates used do not contain hexavalent chromium; the solders of fixed electronic components do not contain harmful substances such as lead. ; Highly decomposable in assembly; and the material name of the resin material used is posted. The latest technology of 3 double-circular fluorescent lamps and lanterns introduces the various characteristics of double-ring fluorescent lamps. At present, the continuous dimming technology and voice prompting technology have been further developed, and a ceiling lamp that considers human physiological laws has been developed (see Figure 13). The light can gradually increase its brightness like a rising sun, and it also emits cheerful music that promotes waking, which will make wakefulness a pleasure. The biggest feature of this product is that it can make the double-ring fluorescent lamp start stably from about 5 brightness (face illuminance below 15lx), which is called dimming technology that does not force wake up. Starting from about 30 minutes before the wake-up time set by the dedicated remote control, the light will gradually increase the brightness like the rising sun, so that the light stimulates the brain through the face and tempts the owner to wake up little by little. And about 2 minutes before the time of getting up, there will be a small bird scream and a melodious music from weak to strong, and the volume will gradually increase, so that the owner can wake up happily. The product uses continuous dimming technology for incandescent and fluorescent lamps, providing superior energy savings and low heat loss in a thin, compact design. 4 Conclusion In today's society where energy awareness is increasing, the use of high-efficiency, energy-saving double-ring fluorescent lamps in homes has become a trend. And the performance of the luminaire must be quickly improved according to the different lifestyles and various subtle needs of the user. In the future, we should strengthen the development of residential lighting fixtures that combine energy saving, color rendering, light comfort, and design, and actively carry out relevant popularization activities.
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