Thyristor module is one of the most commonly used semiconductor devices because of its small size, simple structure and strong function.This device has been widely applied in various kinds of electronic equipment and electronic products, used as a rectifier, inverter, frequency, voltage regulator, contactless control of motor speed, motor excitation, non-contact switch and the power control, etc.
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Nichia develops 100 lumens/watt high efficiency white LED chip
Nichia has announced that it has developed a white LED chip with an efficiency of 100 lumens per watt and is expected to be mass-produced this year. The move comes from increasing competition to improve the efficiency of white LEDs so that they can compete with conventional lighting devices. Nichia demonstrated its prototype of chandeliers and spotlights with white LEDs. For white LEDs, the efficiency must rise to between 70 and 100 lumens per watt to match the fluorescence. In fact, 100 lumens per watt is a milestone for white LED manufacturers. It was originally expected to reach this level by 2008-2010. Large output white LED chips are already visible on the market, but consume more power and reduce efficiency. One approach is to implement efficiency as a module or a luminaire using multiple chips. In this case, each white LED chip does not have a large lumen output, but requires low power dissipation to achieve high efficiency. The chip developed by Nichia outputs 6 lumens at a 20V input of 20mA, achieving an efficiency of 100 lumens per watt. Nichia plans to deliver samples in June and begin mass production at the end of the year. The first products will be packaged in 5mm diameter lamps. Nichia has predicted that 100 lumens/watt of white LED chips will be available in 2010. However, on its development blueprint, this timetable was speeded up and set a new target of achieving 150 lumens per watt in 2007.