Compared with the traditional light source, light-emitting diode (led) has many advantages, such
as low operating voltage, high efficiency, very small and produce directional light. They can provi
de very wide color and white light, do not produce infrared (UV) or ultraviolet (UV) radiation, and
because they are solid-state devices, are mechanically strong and do not contain mercury, in the
appropriate design and use can have more than 50,000 hours of work life, much longer than the stand
ard incandescent 1 thousand hours of life. In addition, they are fully tunable. These advantages ma
ke LED applications more and more widely, and now has a large number of application markets, such
as architectural landscape lighting, traffic lights, display, retail, small and medium size LCD
(LCD) backlight, cars and solar energy, Lighting, residential lighting and even large and medium
size LCD backlight has a growing room for development.
High-brightness LED for lighting design, global energy savings and innovative products of great
significance to the birth of solid-state lighting revolution is essential. This revolution requires
a holistic approach in which LEDs are integrated with power conversion and control electronics and
thermal management solutions and optics.
LED lighting applications power solutions
As mentioned above, the LED is essentially a low voltage device; the forward voltage of the LED is
between less than 2 V and 4.5 V depending on the color and current. In addition, LEDs need to be
driven with a constant current to ensure the desired luminous brightness and color. This requires
a corresponding power conversion and control solution to accommodate different power supplies,
whether it is AC lines, solar panels, 12 V automotive batteries, DC or low voltage AC systems, and
ealkali and nickel based batteries or lithium-ion batteries.