Demand-Controlled Lighting Fixture with Power Interruption Detection
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Solution Overview
Problem
Existing demand control systems for lighting in large consumer sites, such as office buildings, require extensive construction work for installation, making them cumbersome and costly to implement.
Innovation Solution
A lighting system comprising a lighting fixture, a demand controller, and a control device that interrupts power supply to the fixture for a predetermined period based on power usage data, allowing for easy installation and integration with existing power lines, with the lighting fixture automatically dimming upon power interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a demand control system for lighting is newly installed at a relatively large consumer site, then power usage can be controlled to keep it from exceeding contract demand, but extensive construction work is required
Solution Approach 1:
The lighting fixture automatically detects power interruptions and adjusts its own dimming state without requiring external control systems or complex installation infrastructure. The fixture monitors power supply status through its existing power input circuitry and self-regulates brightness based on detected interruptions, eliminating the need for separate control devices and extensive construction work.
Solution Approach 2:
The lighting fixture integrates multiple functions into a single device: it serves as both the light source and the demand control endpoint. The fixture combines power reception, power interruption detection, and dimming control capabilities in one unit, eliminating the need for separate control devices and reducing installation complexity while maintaining power usage control functionality.
2Use of energy by moving object
If power supply is interrupted for demand control, then power consumption is reduced, but lighting continuity is affected
Solution Approach 1:
Instead of complete power interruption, the system uses periodic dimming actions triggered by power interruption detections. The lighting fixture temporarily reduces brightness to a second dimming state for predetermined periods when power interruptions are detected, then returns to normal operation. This periodic dimming achieves power consumption reduction while maintaining overall lighting continuity and avoiding complete darkness.
Data Source
AI summary
A lighting system includes a lighting fixture, a demand controller and a control board. The demand controller obtains power usage of a plurality of devices including the lighting fixture and, outputs a demand signal depending on the power usage obtained. The control board includes a switch provided on a power line and a switch controller that interrupts supply of power over the power line for a predetermined period of time by controlling the switch based on the output demand signal. The lighting fixture includes a light emitter, a detector, and a controller that causes the light emitter to emit light in a second dimming state darker than a first dimming state in which the light emitter emitted light immediately before the detection, if the detector detects that the supply of power has been interrupted for the predetermined period of time.