Intelligent Dimmer Managing Lighting Power Density
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Solution Overview
Problem
Existing lighting systems struggle to balance energy efficiency with lighting quality while adhering to maximum allowable lighting power density standards, such as ASHRAE 90.1, often requiring additional fixtures or higher wattage lamps, which can lead to dissatisfaction and inefficiencies.
Innovation Solution
An intelligent dimmer system that manages lighting power density by establishing a threshold load current and using line voltage sensors to adjust the line voltage applied to the lighting load, ensuring compliance with power density requirements without the need for supplemental circuit protection, allowing for self-sufficient circuit protection and flexible deployment in various lighting designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional fixtures or higher wattage lamps are installed to improve lighting quality, then lighting quality is improved, but lighting power density exceeds maximum allowable limits
Solution Approach 1:
The dimmer circuit dynamically adjusts the lighting power density by varying the RMS output voltage in response to sensed current conditions. The system transitions between different power delivery states (full power, reduced power, cutoff) based on real-time load monitoring, enabling the lighting system to adapt its power consumption while maintaining operational functionality.
2Reliability
If circuit protection devices are added to manage lighting power density, then power density compliance is achieved, but device complexity increases
Solution Approach 1:
The circuit protection and power density management functions are merged into the dimmer circuit itself. The dimmer incorporates current sensing, threshold comparison, and power adjustment capabilities that eliminate the need for separate supplemental circuit protectors or overcurrent devices, reducing overall system complexity while maintaining compliance.
Solution Approach 2:
The dimmer circuit autonomously monitors its own output current and self-regulates power delivery to the lighting load. By sensing the current and comparing it against programmed thresholds, the dimmer automatically adjusts its operation to prevent excessive power density without requiring external control systems or additional protection devices.
3Loss of energy
If dimming control is implemented to maintain power density limits, then energy efficiency is improved, but lighting quality may deteriorate
Solution Approach 1:
The system applies partial dimming action only when necessary to maintain power density compliance. Rather than continuously dimming, the system operates at full power when within limits and applies reduced power only when thresholds are exceeded, minimizing the impact on lighting quality while achieving energy efficiency goals.
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
The intelligent dimmer system effectively maintains lighting power density within regulatory limits, balancing efficiency and quality, reducing energy consumption and costs while eliminating the need for additional circuit protection devices, thus enhancing sustainability and occupant satisfaction.
Implementation Method 1
a line voltage sensor reads the line voltage across the lighting load
Implementation Method 2
a load sensor samples the load current being provided to the lighting load
Implementation Method 3
selectively adjusts the line voltage applied to the lighting load
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
An intelligent dimmer (12) for managing a lighting load (172) coupled to an AC voltage source (174) is disclosed. In particular embodiments, the intelligent dimmer (12) may be incorporated into a system (10) and method (220 - 228) for managing lighting power density. In one embodiment of the intelligent dimmer (12), a control circuit (170) is coupled between the lighting load (172) and the AC voltage source (174). A threshold load current value is established for the lighting load (172). A line voltage sensor (178) reads the line voltage across the lighting load (172) and a load sensor (178) samples the load current being provided to the lighting load (172). The control circuit (170) compares the sampled load current to the threshold load current to determine the presence of a cutoff condition and, in response thereto, selectively adjusts the line voltage applied to the lighting load (172).