A key technical challenge is to Led Tube lamp drive under the operating environment in the low reliability. Most Led Tube lamp drive power in cold temperature environments showed different types of acclimatized phenomenon is characterized by a more prominent and long-term low temperature does not start normally under low temperature operating environment, a higher failure rate phenomenon. The main reason is that the above problems, power supply devices in the design phase of the selection of low-temperature working status did not consider the reliability of some of the key components of the characteristics of low temperature environment changes, resulting in low drive can not boot or normal operation, a malfunction The specific reasons are the following:
(1) switch to download at low temperature carrier density and activity are reduced overload protection will thus reducing the start point.
(2) electrolytic capacitor electrolyte at low temperatures, freezing, loss of capacitance effects (ion in the solution at this time there is only ionic polarization), no load capacity.
(3) some types of optical coupling device does not work under low temperature.
(4) to prevent input inrush current thermistor resistance at low temperatures become larger (which is at room temperature for 3 to 5 times), can also cause hypothermia not start.
The way to resolve these issues mainly Aluminum Casting from the temperature characteristics of a better choice to start the device. For example, not all of the electrolytic capacitor can not work at low temperatures, in general, 200V electrolytic capacitor over poor low temperature characteristics, while the 160V electrolytic capacitor below basic are able to work at -40 ??environment, as long as the selection of two Serial use of low-voltage electrolysis to solve the problem. Selection of the adjustment device may slightly increase the cost of the drive, but from the Led Tube lights look at overall cost is negligible, considering the increased reliability and lower maintenance cost factors, this design is very necessary adjustment and cost-effective .
Led Tube lamp protective measures against ice condensing
Promote the use of lights in the cold regions is very easy to be overlooked is the question of the surface of the ice and snow accumulation in the light, heat melted the ice, ice, once formed, will be on the vehicles and pedestrians have a very big security risk. Especially Led Tube lights, commonly used as light aluminum shell, the surface of alumina a hydrophilic material, more prone to ice condensation. In 2008, a wide range of snow in southern China, resulting in a large number of aluminum wire surface high-pressure ice condensation, collapsed a large number of power facilities damaged. Consequences of this disaster is not only the climate caused by the high-voltage cable alumina surface hydrophilic materials are also an important incentive. The impact on road traffic safety, the prevention of ice condensation is Led Tube lights in the cold regions must take into account the security measures.
To address this critical technology, we are on the ice surface by the microscopic image analysis, analysis of surface water ice, and ice surfaces can be firmly attached to the cause. Experimental results show that performance only of hydrophobic material, to prevent the effect of ice condensation is not ideal, and even in some surface water can be very cold fruit. The results show that: the ice can be attached to any object on the surface; object surface cracks and dents, is to firmly adhere to the ice surface on the other main reasons; simple hydrophobic materials with good performance, delay the ice process, but can not prevent the formation of ice.
For a more accurate comparison between different materials, the ability to prevent ice condensation, we have thoroughly studied from different angles, different objects on the surface structure, surface properties and ice inner relations, including: the structure and ice shape, structure, materials and ice , surface finish and the ice surface, rigid flexible and ice. The results show that: simple structure, shape, organization structure, the surface water, the hydrophobic component performance,Coach Bags not prone to ice condensation.
Based on data from this experiment, we set up for 2 years during the winter housing of different looks and materials Led Tube lights, found by experiment: the appearance of any lighting sleek, smooth; no accumulation of snow or water bearing structure; surface material have excellent hydrophobic properties of Led Tube lamp will not produce ice condensation.
Most of China's cold regions at high latitudes, cold climate, large temperature difference, so Led Tube application of road lighting products, has brought new challenges. On the other hand, most of the annual mean daily cold longer than the national average level of illumination, so the lighting power consumption is also higher than the national average, the shorter days and longer the geographical features of the Led Tube brought more demand for lighting applications . In short, there are both challenges and opportunities.
