LEDs Drivers. Form Mobile Phones to Street Lightings With all the attention devoted to LEDs and LED lighting there is surprisingly little about the rest of the electronics in LED products that are known as drivers. Yet the driver determines such lightings important parameters as efficiency, size and price. As far as LEDs have various applications: from backlighting and panels to street lightings their design must be bnique to every LED product. Driver technology is evolving rapidly to keep up with new applications and new requirements, such as improved power factor correction and sophisticated dimming for improved uniformity and reliability. The driver is an important, but underappreciated LED system component. Its evolution is difficult to forecast. Why? Let’s try to understand.
Energy Consumption Minimization NXP’s GreenChip Technology New Solutions The first NXP Semiconductors’ chips produced by GreenChip technology appeared in 1988. They allowed to reduce power consumption in standby condition from typical 8W to less then 3W. NXP GreenChip products not only conforms to EnergyStar specification energy efficiency hard requirements, but excel them. Utility GreenChip ICs can decrease 90-W power supply adapter power consumption in standby condition to about 30mW. This figure is one order better then figures of commercial “green” products.
Cree’s High Brightness Power LEDs at the Russian Market Cree Inc. was established in North Caroline in 1987. The company main activity was and still is design and production of silicon carbide (SiC) for semiconductor devices. At the beginning of 1990s Cree began intensive development of gallium nitride (GaN) light emission devices on SiC substrates. Thanks to unique SiC production process Gree’s products offer high performance and reliability that let them to be used in consumer and industrial applications, as well as in military and space equipment.
Power Infrared Diodes Infrared diodes (IR diodes) are extensively used in night vision devices, video surveillance, IR lighting, remote control systems, TVs with image intensifier tube based on CCDs, in optical communication systems and others. The main IR diodes figure of merit is their radiant power and radiant intensity in conjunction with wave length. Radiant intensity of the IR diodes family developed at stock company “NPZ OEL “OPTEL” in a continuous mode is 4W/sr, in pulse mode 100W/sr (for narrow directed IR diodes). Radiant power in a continuous mode is 1W (for wide directed diodes). External quantum radiation efficiency amounts to 30 percents. Modules with Fresnel shallow lenses blocks and radiant intensity 65W/sr where created. The main radiation wave lengths are 805±10, 870±20 and 940±10nm.
Filling the Terahertz Gap. Semiconductors Penetrate the Submillimeter Band One of modern semiconductor technology upcoming trends is attributed to development of the so called Terahertz (THz) gap that is a electromagnetic spectrum range from 0.5 to 20 THz. Transmitters and receivers of this frequency range will improve not only military and aerospace but also commercial equipment performance. But until quite recently the lack of terahertz signal generators, receivers, processors and I/O antennas prevented submillimeter wave range development. This motivated DARPA to start several programs to develop submicrowave monolithic ICs (sMMICs) on the basis of nanotransistors and to create radiation I/O methods precision metrology.
LeCroy’s Differential test probes of WaveLink Series: High Precision and Versatility Metrologists, developers and maintenance men very often have to solve a problem of connecting the device under test to the measurement unit with minimal signal distortion. The most viable solution is to use differential probes. LeCroy’s probes of the WaveLink series belong to such devices
Multicore Processors for Communication Systems. Opportunities and Problems Mobile devices information transfer capabilities popularity quick growth has led to a new class of processors that are aimed for networking. Multimedia content expansion leads to network traffic increase and this in its turn applies specified requirements to network processors. Multicore heterogenic systems conform these requirements and provide network traffic effective processing and when necessary perform other processes.
Russian Nitride Microwave Technique: Materials and Technology Metal nitrides of III group more then 30 years ago where estimated as very challenging material for ultrahigh frequency power transistors production. Generally this challenge was seen as a replacement of TWT in microwave equipment by solid-state power amplifiers. To the fullest extent it was expected that transmitter’s mass-dimensional characteristics would be significantly decreased simultaneously with increase of its reliability and maintenance. However for a long time nitride process technologic problems did not permit to go over from material academic researches to development of applicable nitride microwave devices.
LEDs Market. Of Interest Redistribution In spite of price erosion, business barometer decrease and difficulties attributed to investments growth, demand growth for novel LED backlighting and Christmas purchases would simulate successful LEDs industry development. LEDs producers announced that in September they received express orders for mobile and tablet backlighting LEDs. LED TVs rollout will promote not only LEDs consumption but industry recovery too. LEDs will still perform small and medium LCDs as well as PC monitors backlighting. Simultaneously with LED backlighting LCD packaged LEDs growth use will declane. Alongside with that the LEDs lighting market grows thanks for governmental measures of many countries that address SSL- development.