DALI Power Supply Isolation Barrier Controller
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED drivers with DALI interfaces face challenges in accommodating variable current settings, leading to increased costs and compatibility issues due to the need for multiple opto isolators and adherence to the DALI Standard's current limits.
Innovation Solution
A powered device with a digital addressable lighting interface (DALI) connected to a load, featuring a microprocessor on the primary side of an opto isolator that generates signals to select current values between zero and a maximum current, using a single opto isolator to both turn the current on/off and select the current level through pulse width modulation (PWM).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple opto isolators are introduced to enable variable current settings, then current selection flexibility is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The single opto isolator is designed to perform multiple functions: it can select between different current settings (55mA or 110mA) and also control the on/off state of the current supply. This multi-functional design eliminates the need for separate opto isolators for each function, reducing component count while maintaining full current selection flexibility.
Solution Approach 2:
The patent combines the functions of multiple opto isolators into a single device. By merging the current level selection function with the on/off control function into one opto isolator, the system achieves variable current settings without increasing the number of isolation components, thereby simplifying the overall device architecture.
2Power
If higher current setting (110mA) is used to meet implementation requirements, then lighting performance is improved, but DALI standard compliance deteriorates due to exceeding 250mA limit when multiple drivers are connected
Solution Approach 1:
The system dynamically changes the current parameter based on system requirements. By providing selectable current settings (55mA or 110mA) that can be configured through a single opto isolator, the system can adapt to different implementation scenarios while ensuring that the total current across multiple DALI-connected drivers remains within the 250mA standard limit.
3Extent of automation
If separate control components are added to each lighting load for DALI signaling, then signaling capability is improved, but device complexity and cost increase
Solution Approach 1:
The opto isolator serves multiple functions including DALI signaling control, current level selection, and power supply switching. This multi-functional approach eliminates the need for separate control components at each lighting load, maintaining full DALI automation capability while reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for dynamic selection of current settings for DALI current sources, reducing component count and manufacturing costs while ensuring compliance with DALI standards and enabling efficient power management.
Implementation Method 1
The opto isolator may be turned on and off so that an opto diode of the opto isolator is conducting or not conducting
Implementation Method 2
generate a second signal to provide power to the DALI at a selected current value between the zero current value and the maximum current value
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A device, system, and method configure a power supply of a powered device. The powered device includes a digital addressable lighting interface (DALI) connected to a load to be powered by a power source. The powered device includes an isolator. The powered device includes a controller positioned on a primary side of the isolator. The controller is configured to generate a first signal to select whether to provide power to the 5 DALI at a zero current value or a maximum current value. The controller is further configured to generate a second signal to provide power to the DALI at a selected current value between the zero current value and the maximum current value.