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DALI LED Dimmer Enables Building Lighting Automation
Building automation and home automation enable users to control home appliances and furniture intelligently. Lighting devices play very a very important role to create the right moods for different atmosphere in our daily life and smart lighting control is a vital part of home and building automation.
DALI is a digital control protocol for lighting which consists of a bus with master control units and lighting devices (light dimmers, LED drivers, electronic ballast etc.) connected via it. Bi-directional data exchange enables the masters to watch and control each light. The protocol permits devices to be individually addressed and it also incorporates Group and Scene broadcast messages to simultaneously address multiple devices.
DALI lighting devices are available in various types including LED drivers, fluorescent HF ballasts, low voltage transformers, PE cells, motion detectors, wall switches and gateways to other protocols. Each network allows up to 64 devices. Sites requiring more than 64 devices are implemented by having multiple separate networks, each with up to 64 devices. These separate networks are then linked together with DALI gateways and a knowledge backbone running a high level protocol. For home lighting automation, 1 network is enough to install all lighting devices that may be controlled by one master control unit.
The master control units are used to send DALI signal to lighting devices via the bus and are available with various styles including rotary knob, push button and touch control panel which feature their own advantages respectively. Mono, dual color (warm white and cool white), RGB/RGBW ones can be found for lights with different colors. The masters are powered directly by DALI Bus with little or no power consumption. They also feature the automatic address assignment function and enable to pick different single light address, group address for controlling by encoding switch to be able to control multiple lighting device synchronously or separately.
Correct lighting devices shall be chosen for LED lights. LED dimmer with DALI receives DALI signal from the master unit and outputs PWM signal to control the connected LED lamps. Based on input type of LEDs, AC or DC DALI LED dimmer shall be chosen. Constant current or constant voltage output types are available for DC version. Generally the devices are designed with standard DALI control interface with numeric digital display which enables users to set address manually and maximally 64 addresses may be set. The devices may be available in 1 channel or 4 channels output to fit for mono chrome, dual color and RGBW. Push dim function is accessible while controlled by a standard timer switch tm-848 push switch.
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