Lighting Control Device Minimum Brightness Safety
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Solution Overview
Problem
Conventional lighting control systems that adjust brightness based on scheduling functions may cause safety hazards by reducing light brightness too low, leading to inadequate visibility and increased risk, while also failing to effectively manage power consumption.
Innovation Solution
A lighting control device that stores schedule information associating control values with time points or periods, includes a transmitter to send control values to luminaires, and a controller that adjusts brightness based on power-saving instructions, ensuring a minimum predetermined brightness is maintained even during power-saving modes to prevent excessive dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the luminaire emits light at a lower brightness to reduce power consumption, then the amount of power used is reduced, but the safety is compromised due to insufficient visibility of the surrounding environment
Solution Approach 1:
The system dynamically changes the brightness parameter of the luminaire based on power saving instructions and current time, adjusting between scheduled brightness and reduced brightness while maintaining a minimum safety threshold. This resolves the contradiction by allowing brightness to vary within safe limits rather than being fixed at either high or low levels.
Solution Approach 2:
The lighting control device implements dynamic brightness adjustment by switching between different control strategies: scheduled brightness control during normal operation, and time-dependent brightness control during power saving mode. The system continuously adapts brightness levels based on real-time conditions (power saving instructions and current time) rather than using a static brightness level, thereby resolving the contradiction between power reduction and safety maintenance.
2Reliability
If the luminaire follows the schedule information strictly, then the brightness control is simple and reliable, but the power saving potential is limited when power saving is instructed
Solution Approach 1:
The system transitions from static scheduled brightness control to dynamic adaptive control when power saving instructions are received. During power saving mode, the brightness is adjusted based on current time relative to scheduled time points, allowing the system to reduce power consumption while maintaining reliability through controlled minimum brightness levels. This dynamic approach resolves the contradiction by enabling flexible power management without sacrificing control reliability.
Solution Approach 2:
The system changes the brightness parameter dynamically based on power saving instructions and time conditions. When power saving is instructed, the brightness parameter is adjusted to be lower than the scheduled value but not below a minimum threshold, allowing the system to optimize power consumption while maintaining reliable and safe operation.
Data Source
AI summary
A controller included in a lighting control device causes a transmitter to transmit a dimming rate which is determined by schedule information stored in a storage when power saving is not instructed via a power saving instruction signal. When power saving is instructed via the power saving instruction signal, the controller calculates a dimming rate for causing a luminaire to emit light at a brightness lower than in the case of the dimming rate determined by the schedule information. When the calculated dimming rate is a dimming rate which causes the luminaire to emit light at a brightness lower than a predetermined dimming rate, the controller causes the transmitter to transmit the predetermined dimming rate.