Characteristics of led lighting panel power supply

      LED panel light because of its energy-saving, environmental protection, adjustable light, low energy consumption, long service life and is loved by people, but in the LED panel lights, there is an easily overlooked important constituent, is the power of LED panel lamp.
      LED panel light's power plays an important role in the work of the LED, it can regulate the stability of current, filtering interference protection circuit security, greatly affects the LED panel lamp performance and life.
      In the current market, the characteristics of high-quality led lighting panel power supply:
      1. The new modular power supply IC
      Boost DC / DC converter is a high efficiency, but the ripple and noise voltage is large, low-dropout linear regulator low efficiency but noise is minimal, consisting of a combination of the two dual output power supply IC can solve the efficiency and noise issue.
      2. High output voltage accuracy
      Output voltage accuracy is ± 2 ~ 4%, there are a lot of new power IC accuracy is ± 0.5 and ± 1%; and the output voltage temperature coefficient is small, typically ± 0.3 ~ ± 0.5mV / ℃, and some can reach ± 0.1mV/ ℃ level. Linear adjustment rate is generally 0.05% ~ 0.1%/V, some up to 0.01%/V; load adjustment rate is generally 0.3 ~ 0.5%/mA, some up to 0.01%/mA.
      3. Low operating voltage
      The LED panel light power supply voltage general is 3 ~ 3.6V. There are some lower working voltage, such as 2, 2.5, 2.7V; there are also some working voltage is 5V, and special use a 12V or 28V voltage source.
      4. Perfect protection measures
      Power IC has perfect protection measures, which include: output over-current limit, thermal protection, short circuit protection and reverse polarity battery protection, the power supply to the safe and reliable work, not easy to damage.
      5. Small package size
      In recent years, LED panel lights are used SMD devices, power IC is no exception, there are SO packages, SOT-23 package, μMAX package and the smallest package size SC-70 and the latest SMD package。The power accounted for less and less space.
      6. Low operating current
      As the current most LED panel lamp is less than 300mA, so the 30 ~ 300mA power in species and quantity accounted for the larger proportion.

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Thermal properties of e27 led light bulb

      Bulb light due to size restrictions, so the thermal properties of e27 led light bulb should be improved. No matter what kind of radiator can only rely on the convection and radiation in two ways to dissipate heat into the air, and these two kinds of heat and its heat is proportional to the area of. The bulb lamp radiator area limitations, so it is difficult to heat than 7-9W. According to the LED light effect at present, lumen it is equivalent to 60W incandescent lamp. With LED light efficiency increased year by year, I believe there will be the same size but can replace incandescent lamps with 100W.
      Radiator material at present most of the use of aluminum alloy, because of low cost, easy processing, and good thermal conductivity. But recently there has been a lot of insulating plastic radiators and ceramic radiator, the radiating effect is not bad. Because the final heat mainly by convection and radiation. Convection is completely determined by its shape and area. Radiation and radiation related materials. Oxidation is an important way to improve the heat radiation of metal materials. The conductive plastics do not need any radiation coefficient of oxidation treatment can achieve very high. So as long as the appearance and the metal radiator, the convection and radiation effect and the metal heat sink effect is the same. But the heat conductivity and certainly not metal, so the overall cooling effectiveness will be less. But if you do it as thin as possible, wall plus a layer of metal, can put the unfavorable factors of the low heat conduction to a minimum. Now has a coefficient of thermal conductivity is greater than 20 w/mk plastic, but the price is relatively high. And plastic radiator ceramic radiator. But its thermal conductivity can be made higher cost is much higher, of course. The biggest advantage of plastic and ceramic insulation, so even if the non isolated power supply is also easily through the safety inspection.
      In addition, in order to improve the heat dissipation effect of e27 led light bulb constant current drive power, usually have to add thermal sealant to replace the poor thermal conductivity of air. Another method is to punch in the radiator, so that the flow of air. But there will be waterproof problem.

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