AGENDA

8:00 – 9:00: Registration and check-in

9:00 – 9:15: Opening introduction and remarks

9:15 – 9:45: Keynote address: Beyond Energy Efficiency—Opportunities to Influence Human Behavioral Response with Solid-State Lighting, Cary Eskow, director, Lightspeed, Avnet Electronics Marketing 

9:45 – 10:30: LED manufacturers’ panel
The leading HB LED vendors answer question about how LED unique capabilities can be exploited by creative, electronics, thermal management, and optics. Confirmed participants: Cree, Lumileds, OSRAM

10:30 – 10:45: Morning break

10:45 – 11:45: Technical papers (choose one)

Dimmable Luminaires, George Rasko and Charlie Coleman, applications engineers, ASIC Advantage
Electrical design of luminaires for LED lighting applications combines requirements that are common to typical power supplies (power factor correction, fault protection) with needs that are specific to this industry (dimming control, color control).

Converter Topologies for LED Drivers, Peter Green, manager, LED Systems and Applications, International Rectifier
Granted, LEDs are incredibly efficient light sources, but what about when the power conversion efficiency is factored in? This paper compares LED efficiency in lumens/watt and discusses the overall efficiency of the converter converter plus light source. It explains converter requirements, such as LED drive requirements, dc current rating, max current, and requirements based on the LED manufacturer's specifications. The presentation also includes specific examples of low voltage dc-dc boost for back lighting panel for laptops, step-up and step-down topologies, and challenges in dimming circuits.

11:45 – 12:45: Technical papers (choose one)

Thermal Management of Visible LEDs, Mike King, visible LED assemblies product engineer, Optek
The key parameters influenced by the LED's junction temperature include luminous flux, dominant wavelength or color temperature, packaging constraints, assembly cost, operating cost, luminous, and color maintenance. Accommodating thermal effects on these parameters will be key to the overall success of your LED-based application. This paper covers the physics of LED heat generation and removal, measuring junction temperature, and passive and active thermal management, including the thermal components used in the design.

Intelligent LED Lighting Systems and Network Technology Choices, Bobby Wong, staff technical engineer, Microcontrollers, NEC Electronics America, and Lance Zheng, application manager, Multipurpose Microcontroller Strategic Business Unit, NEC Electronics America
General energy efficiency savings have already driven commercial and architectural lighting applications toward LED technology. To improve the overall energy savings on top of that, designers can use remote sensing and remote control to turn on, turn off, or dim LED lighting systems. For instance, LED lights inside supermarket refrigerators could be turned on or off based on sensor input of customer traffic. LED lights in office buildings could be dimmed based on the ambient lighting (outside light) and occupancy. These sensors and controller are placed in different locations in different applications, requiring different kinds of control communication ranging from wired to wireless, and from unidirectional to bidirectional.

MCU-based constant current LED drivers not only enable intelligent control for LEDs, such as dimming and color balancing, but are flexible enough to adopt different control communication as needed. These MCU-based LED drivers use integrated analog peripherals, such as programmable PWMs, ADCs, and dedicated constant current hardware, to drive the LEDs. The integrated hardware operates without any MCU supervision, which can free the MCU to focus on handling control communications. We will explore several communication protocols targeted for LED lighting, their applications, and trade-offs. For example, the wireless ZigBee protocol, which is spearheaded by leading Smart Grid proponents and utilities such as Pacific Gas and Electric (PG&E), could enable lighting systems to seamlessly tap into a self-forming Home Area Network. Its application and benefits are different from wired protocols like DALI and DMX 512, which are the traditional lighting protocols for lighting controls in offices and in theaters. We will highlight the memory and processor utilization on some of these communication protocols to provide designers with a better understanding of implementation trade-offs.

12:45 – 2:00: Networking lunch and sponsor showcase

Luncheon keynote speaker, Bob Householder, Fraen Corp
Single Optic Solutions for LED Color Mixing
Prior to advances in high power white LEDs (light emitting diodes), the main application of LEDs for lighting was for color accent and indication. Although white LEDs have found a market with general illumination, there remains a strong, growing market for high light level color and mixed color lighting products. As these markets grow, the demand for higher lighting quality increases. Light control of single optics for each color LED or optics for multichip LED becomes the critical design component for mixed color lighting. This presentation will identify current product types, color-mixing performance, and inform the audience of the types of optical technology to solve color-mixing problems along with specific examples of the technology.

2:00 – 3:00: Hands-on workshop 1/demonstration lab (choose one)

Avnet/Lightspeed
Hands-on workshop involves creating a solid-state lighting luminaire from scratch, including HB LEDs, cooling unit, and control electronics.

International Rectifier
Hands-on workshop including a complimentary IR demo board with HB LED driver circuitry

The session will include schematics and detailed descriptions for the circuit operation of Buck, Flyback, and multistage LED converter topologies as well as different methods of dimming and their implementation in LED drivers. There will be a demonstration of the IRPLLED1 demo board based on the IR2540 control IC showing PWM dimming capability. Explanation of advantages/limitations of the popular Flyback converter topology as well as the multistage approach, including the front-end Boost PFC circuit and the isolating half-bridge step-down stage, will conclude the session.

3:00 – 4:00: Hands-on workshop 2/demonstration lab

National Semiconductor
LED Design Made Easy

LED technology is undergoing a period of rapid change and innovation, with ever brighter and more efficient parts being introduced, and this makes it difficult for an engineer to keep up with the latest products. Fortunately, online tools for LED selection and implementation have been introduced to make choosing an LED and LED driver easier. Real-world design examples will be presented showing tradeoffs involved in selecting and designing LED circuits. This includes an AC dimmable LED application and DC Boost and Buck applications.

4:00 – 5:30: Networking reception and sponsor showcase