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LED lighting is a rare and no pollution green light, made up of solid state semiconductor devices, and it can turn electrical energy into light. Compare with traditional incandescent bulb, fluorescent lamps, LED light bulb with smaller size, lower power consumption, longer service life, more colors, environmentally friendly and excellent seismic performance. These decided it got a leading-edge position in modern lighting market, and became popular very fast. LED needs a power supply (also called LED driver, which is the heart of this new generation lamp), and its quality will directly affect the life span of integrated lighting fixture. So how to make a perfect power supply for LED is the TOP PRIORITY. In this post we are going to talk about some key points of driver and its design, try to provide some help.
1, the circuit design of power supply directly affects the life of LED light bulb
LED driver divided into two types, digital-driven and analog-driven. Digital-driven means digital circuit driving, such as digital dimming control, RGB full color changes, etc. Analog circuit-driven including AC constant current switching power supply and DC constant current control circuit.
All drivers are made up of electronic components, semiconductors, resistors, capacitors, inductors, and all of these components are have life, any failure would cause the entire circuit down or partial function lose. LED’s life time is over 50,000 hours, which means it can continuously lit nearly 6 years. But power supply is very difficult to reach 6 years service time and its warranty generally available at 3 years in present market. Only the military product level switching power supply can have a 6 years warranty, but its price will be 4-6 times of normal power supply, very unfriendly. So the most fault of LED lighting fixture is its driver circuit fault.
2, heat dissipation issues
As a cold light source, LED can’t exceed its operating junction temperature limit, and have to set aside a certain allowance when you design LED luminaries. And during the entire design process you have to consider about how to make it in a nice appearance, easy be installed, with an excellent light effect, great cooling system, and many other aspects at the same time, in order to make lamp as best as it could be.
But LED light’s history is very short, still on the way to be better and better. Some LED light bulb manufacturers are purchasing driver from other factory, not design driver by them self. Unfortunately their lighting designers don’t know the outsourcing power supply very much, so, the light source get a big heat sink space and rest a small part for power supply. Even some of them are design lamp first, and looking for the appropriate power supply after LED luminary housing design already finished. This non-professional action only brings more difficulties and unexpected problems. Due to that small space of lamp, high internal temperature or budget shortfall, they even can’t find the right driver.
Some professional manufacturers have ability to research and development their own power supply. THIS IS A GREAT ADVANCE – do lighting design and power supply design at the same, will solve all above problems. Consider the heat dissipation of LEDs and power supply both, to control the whole lamp temperature rises, LED lights’ quality will be much better in this way (This is why CREE, PHILIPS, OSRAM design & produce their own brand LED divers – make their light sources in a perfect play, and with the best quality guaranteed).
3, problems may need attention during design LED driver
A, power/wattage. Although LED has a high light efficiency, but it still has 80-85% of heat loss, which make the whole lamp inside temperature higher than outside 20-30 degree. If the room temperature is around 25 degree, the inside of LED light bulb will be 45-55 degree. So, the power supply have to working in a high temperature environment for a long time, and in order to ensure its long life time, the wattage of driver have to be increased as 1.5-2 times for set aside a certain allowance. small touch bedside lamps