How to choose the power supply and the drive of the LED light

The using problem of the electrolytic capacitor: as far as the use of electrolytic capacitors is concerned, the manufacturers are using electrolytic capacitors as almost 99% of the power of the LED lighting products, the life of the Electrolytic capacitor is completely unable to over 30,000 hours.

The aluminum electrolytic capacitors was generally 105 ℃ / 200 hours 10 years ago,. Which means that life is only 84 days under the conditions of the temperature at 105 ℃! Even down to 85 ℃, life is only 332 days, less than a year! Continue to reduce to 75 ℃, the life will not exceed two years .

Relative to 100,000 hours life and the semiconductor devices and passive components of semi-permanent life, the aluminum electrolytic capacitor is mainly the key components that lead to that the life of the LED is not performing up to the mark

Even if using the latest high-temperature electrolytic capacitors  whose life is 8,000 hours at 105 ℃, according to the estimation formula of the prevailing life of the electrolytic capacitors "temperature decreasing by 10 degrees, doubling the life," then the working life is 16,000 hours at 95 degrees, the working life is 32,000 hours at 85 degrees， the working life is 64000 hours at 75 degrees, if the actual operating temperature is lower, then life will be longer!

The LED driver technology with no electrolytic capacitor, if from the perspective of the technology of the aluminum electrolytic capacitors  ten years ago, aluminum electrolytic capacitors are not capable of LED and other life. Workaround is generally no electrolytic capacitors technology, which is the underlying causes that the technology of no electrolytic capacitors LED driver was popular in previous years,. But the question that can not be said is that what the consequence that the no consequences electrolytic capacitors is adopted is that the performance of LED driver circuit is degradation, indirectly causing  the serious shortage of LED life.

Because the design of the drive and power of no electrolytic capacitor supply is to enhance the power and power efficiency， no general electronics designers can achieve. The most important consideration is cost.

Currently, the Japan ruby ​​capacitor aluminum electrolytic is the manufacturers of the aluminum electrolytic capacitor whose life is exceeded 10,000 hours at 105 ℃ temperature. Those who understand the Electronic devices all know, not for the particularly high-tech products, there are few manufacturers of LED power afford so expensive capacitors.

2 power factor and efficiency: If the power factor can not be improved to 95% and the power efficiency is more than 85%, it is meaningless that LED lighting products is used to replace the traditional lighting.

Therefore, the current 99% of LED lighting products manufacturer (even including all Japanese brand) is totally not up to the so-called basic required standards of the LED lamp.

Low-grade products is purely the power supply that can convert the AC to DC， a little better is those that raises the power factor to between 70 and 85 percent, but the power efficiency is only 70% or even less than 65%. This shows the actual power consumption is that the marked value of the product watts must plus 50 to 60% of power consumption. As for the life of the LED road light even without looking up. Because of its drive，the power life is not 10,000 hours (but at the same time how its cooling effect have to be considered, or even worse ).

3 Because the bipolar power devices is cheaper than the MOSFET，which is generally about 2 cents/pcs, so some designers use the bipolar power devices in order to reduce the cost of the LED drivers, which will seriously affect the reliability of the circuit, as the temperature of the circuit board of the LED drive increases，the effective operating range of the bipolar devices will rapidly reduce, which will lead to the malfunction when the temperature of the device rises so that the reliability of LED lamps is affected, the correct approach is to use MOSFET devices, the life of the MOSFET device is much longer than bipolar devices.

However，there are still a large number of excellent manufacturer engaging in manufacturing and researching the LED light，of which the lead lighting is just one，lead Lighting adopts high brightness SMD as the light source of the LED tube and highly integrated and high brightness COB as the light source of the LED flood light, which fully guaranteed stability and soft light of the LED tube light and octahedron breadth and brightness irradiation range of the LED flood light, while the low voltage constant current driver convert the AC  into DC so that improve energy efficiency of the LED tube light and LED flood light and reduce the waste heat energy and stroboscopic effect exciting the human eye, the most important is that the LED lighting without adding mercury and other heavy metals harmful to our body and pollution the environment, that’s why the LED light is famous for energy-saving and environmental protection ，login www.ledclan.com to learn more features and uses of the LED tube light and surf www.lead-lighting.com to know more awesome LED floodlights and other LED lighting.