Lighting Control Device Dimming Rate Adjustment
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Solution Overview
Problem
Existing lighting control systems face issues where demand control can inadvertently increase power consumption when feedback control is already inhibiting the output of lighting devices, leading to counterproductive energy usage.
Innovation Solution
A lighting control device that includes a brightness sensor, storage, controller, receiver, and transmitter, which determines a dimming rate based on brightness information and a target value when no energy-saving signal is received, and adjusts this rate by multiplying the target value when an energy-saving signal is received to maintain energy-saving operations without increasing output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If demand control is applied to change the dimming rate to a preset value, then power usage is inhibited, but the lighting device output increases when feedback control is already active, leading to increased power consumption
Solution Approach 1:
The system continuously monitors the actual brightness of the illuminated surface and compares it with the target brightness value. Based on this feedback, the controller dynamically adjusts the dimming rate to maintain the desired brightness level while responding to energy-saving signals, ensuring that power consumption is reduced without compromising the required illumination intensity
Solution Approach 2:
When an energy-saving signal is received, the system changes the target brightness parameter by multiplying it with a predetermined coefficient (e.g., 0.8). This parameter change propagates through the feedback control mechanism, resulting in a new dimming rate that reduces power consumption while maintaining the proportional relationship between the target brightness and actual brightness measurement
2Use of energy by moving object
If the dimming rate is changed to a fixed preset value under demand control, then energy-saving operation is enforced, but the adaptability to current lighting conditions is lost
Solution Approach 1:
The system transitions from a static fixed dimming rate approach to a dynamic control mechanism. The dimming rate is continuously adjusted based on real-time brightness measurements and energy-saving signals. When energy-saving mode is activated, the target brightness value itself becomes dynamic, being scaled by a predetermined coefficient, which then drives the feedback control to achieve the new adaptive dimming rate that responds to current lighting conditions
Data Source
AI summary
A lighting control device that controls a lighting device includes: a brightness sensor that obtains brightness information indicating a current brightness of an illuminated surface; a storage that stores a brightness target value for the illuminated surface; a controller; a receiver via which the controller receives an energy-saving signal; and a transmitter that transmits, to the lighting device, a control signal generated by the controller. When the energy-saving signal is not being received, the controller determines a dimming rate for the lighting device based on the brightness target value and the brightness information. When the energy-saving signal is being received, the controller determines an energy-saving brightness target value smaller than the brightness target value by multiplying the brightness target value by a predetermined rate and determines an energy-saving dimming rate for the lighting device based on the energy-saving brightness target value and the brightness information.