apec2002dali| Application Note
Digitally Addressable DALI Dimming Ballast
Cecilia Contenti and Tom Ribarich
Applications Engineer, International Rectifier, Lighting Group, 101S Sepulveda Blv. El Segundo, CA, 90245-4382 tel. (310)726-8927, fax. (310)726-8846, email: cconten1@irf.com
as presented at APEC 2002
Abstract: A digitally addressable digital dimming ballast has
been developed. It conforms to DALI standard requiring very few parts and operates at very low power. Applications include building management or studio lighting where it is desired to control single or groups of lamps for conserving energy, performing lamp maintenance or creating prefect light quality. The design includes the digital dimming ballast, the code of the micro-controller and a platform to control the ballast by PC.
ballast control, receiving status information from the ballast control and sending status information back to the user. This allows for complete and precise control of an entire lighting environment. A typical digital dimming solution includes an ASIC for sending and receiving instructions from the micro-controller and optocouplers for isolating the control input (Figure 3). The ASIC contains the necessary functions for controlling the lamp brightness as well as a digital interface for communicating with the micro-controller.
I. INTRODUCTION Digitally addressable lighting is slowly emerging as a popular means for controlling complete lighting environments for a wide variety of different applications. Individual control of each lamp enables the end user to precisely deliver the correct amount of light when and where it is required. Managing the light in this manner allows for a massive reduction in global energy consumption due to lighting. Industrial environments can conserve the total energy required for lighting while actually increasing light quality in certain areas at given times. A complete digital dimming system includes the dimming ballasts and a digital control unit for converting information from an Ethernet connection to the communication protocol required by the micro-controller in each ballast (Figure 1). Applications for this system include building management or studio lighting where it is desired to control single or groups of lamps for conserving energy, performing lamp maintenance or creating precision lighting
effects.
Line Neutral Earth
Ethernet
Net-to-DALI Converter
64 Digital Dimming Ballasts
Net-to-DALI Converter
64 Digital Dimming Ballasts
Net-to-DALI Converter
II. DIGITAL DIMMING
64 Digital Dimming Ballasts
Digital dimming ballasts include an EMI filter, rectifier, power factor correction, and ballast output stage (Figure 2). The digital ballast also includes a micro-controller for sending and receiving information digitally. The microcontroller functions include storing the ballast address, receiving user instructions, setting the dim reference for the
Figure 1, Typical digital dimming system.
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