LED-Lighting (Page 2)

Technology licensing company. Manages and Provides Licenses to IP Intellectual property and Patents of semiconductor Technology. Founded in 1990.  XDR, DDR3, RDRAM and FlexIO are some of the Technology Solutions from Rambus.

Rambus – IP Provider – Semiconductors

“Beginning with edge-lit back lighting, Rambus has pioneered light guide-based design solutions for a broad range of LED lighting applications, enabling a new level of styling, efficiency and control of light.”

LED lighting technology - Rambus

LED lighting technology

Rambus’ lighting solutions enable manufacturers to use fewer or lower-cost LEDs in their general lighting products while delivering superior light quality and output.

Sub contract manufacture, electronic assembly, system development, custom software, control panels with for automation and manufacturing.

SDL Spimin

SDL Spimin Developments – Electronic Manufacturing

“”Established in 1976, Spimin Developments Limited design and manufacture its own range of industrial electronics and has a highly experienced contract manufacturing division.”

SDL Spimin Developments - Electronic Manufacturing

They have a range of production equipment is extensive, including surface mount machinery, convection ovens, flow soldering machines, wire stripping machines and a wide range of test and inspection equipment.

Their production, test and inspection staff have many years experience in producing high quality assemblies to the highest specifications.

Seoul Semiconductor is a Korean company manufacturing Optical Semiconductors like LED devices for Lighting. They have designed a LED chip called Acriche, a semiconductor light source that operates directly from AC power or Mains Power, useful for residential and commercial lighting.

LED devices from Seoul Semiconductor

Z5 series is very small size (3.5*3.5*2.0mm), ceramic-based package, and large radiation plate make heat management of Z5 easy.

Z Power LED – Z5M

Z-Power-LED-Seoul.jpg

High-intensity SMD LEDs Z5M/P with a thermally optimized design for general lighting. Even available with a color rendering index(CRI) of 90.

GE Lumination offers a wide range of world-class, environmentally responsible LED solutions and systems for signage, architectural, transportation, display lighting and general illumination applications. Lumination is a GE Consumer & Industrial business in collaboration with Nichia.

GE – LED Lighting Solutions

Solid-state lighting solutions can be built using Vio LED. Energy savings, long life and robustness. “Vio LEDs combine 405 nm violet chips with proprietary phosphors to create a natural white light.” Warm white light, similar to Edison Filament Lamp.

Vio White LED – Lumination GE

From Tech Products Preview – Electronic Tools and Industrial Equipment

Some Features

  • 1, 4 and 7 watt designs
  • 70 CRI (45 lpw) & 85 CRI (38 lpw)
  • 180° beam angle
  • 70% lumen maintenance at 50,000 hours under normal operation

The MAX1561 and MAX1599 include an internal, high-voltage, low-RDS(ON) N-channel MOSFET switch for high efficiency and maximum battery life. A single DualMode input provides a simple means of brightness adjustment and on/off control.

MAX1561 – 26V Step-Up Converters – Maxim IC

“High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs”

MAX1561 - 26V Step-Up Converters - Maxim IC

 

Fast 1MHz (500kHz for the MAX1599) current-mode, pulse-width modulated (PWM) operation allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup.

Some Features –

  • Accurate Current Regulation for Uniform Illumination
  • High Efficiency Up to 87%
  • 2.6V to 5.5V Input Range
  • 0.3µA Shutdown Current
  • 26V (max) Output with Overvoltage Protection
  • Up to 900mW Output Power with Internal 30V MOSFET Switch

Why Drive White LEDs with Constant Current? – Maxim

Here you can understand how to drive white LED’ s for flashlight or Internal lamp. I have tried substituting for tubelights and bulbs. These LED’s are amazing. The amount of light at even 100mW is phenomenal. The future is indeed LED Lights. But more Amber component is required in LED to give the warm feeling of an Edison Lamp.

This circuit generates an usable power 5V good for charging portables. Even lighting a White LED Array.

A Supercap Flywheel may be good addition to this, these kind of chips can also add supercap power management, as it will take a lot of current to charge up. This will keep power flowing when the sun goes behind the clouds.

Harnessing Solar Power with Smart Power-Conversion Techniques

“Obtaining all the available energy from a solar panel requires a switch-mode step-up or -down converter and battery charger, in addition to the battery. The converter must ensure that every bit of energy taken from the solar panel is efficiently stored in the battery for future use.”

Solar Cell Voltage Booster with MAX856.

The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems.

LED Drive Solutions and Power Supply Design ideas. Robust and efficient high-brightness LED drivers. Zetex have LED drivers for boost/buck they are cost effective too,

Zetex range of LED drivers – Diodes Incorporated

Shown below is a design from an Application Note of Zetex. Here ZXSC400 drives a Luxeon V Star LED. The input voltage ranges from 4.2V to 5.4 V with a maximum output current of 700mA at 5V input.

ZXSC400 - LED driver boost converter

ZXSC400 – LED driver boost converter

Voltage mode boost converter in the SOT23-6 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Excellent load and line regulation.

1.8V to 8V supply range, regulation of ±1%, 80% efficiency, 4.5µA Quiescent drain.