Lighting Control Unit Periodic Command Transmission
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Solution Overview
Problem
Conventional methods for relative control of lighting systems, such as dimming, require frequent transmission of the same command to achieve incremental changes, leading to high bus system utilization and potential delays in processing other commands.
Innovation Solution
A method and controller for relative activation of lamps that determine target setting values cyclically, generating control commands only at predetermined intervals with a fade time, allowing for efficient and precise control by moving to support points corresponding to these values, thereby reducing the number of commands transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the same control command is repeatedly transmitted at very short intervals to achieve relative control, then the responsiveness and precision of control is improved, but the bus load increases and processing delays occur
Solution Approach 1:
The patent applies periodic action by transmitting control commands at predetermined time intervals rather than continuously. The control unit determines target setpoints cyclically and transmits commands only at these periodic intervals, which reduces the quantity of commands transmitted while maintaining acceptable control responsiveness. This resolves the contradiction by finding an optimal period that balances responsiveness with bus load reduction.
Solution Approach 2:
The control unit performs preliminary action by determining target setpoints in advance at predetermined intervals before they are actually needed. By pre-calculating and preparing control commands at scheduled times, the system reduces the need for frequent real-time command transmissions, thereby lowering bus load while maintaining control precision through advance preparation of control actions.
2Measurement precision
If control commands are transmitted frequently to achieve precise relative control, then the control precision is improved, but the processing time for other commands increases
Solution Approach 1:
By implementing periodic determination of target setpoints at predetermined intervals, the system maintains control precision through regular updates while avoiding continuous command transmissions. This periodic approach ensures that control precision is preserved at key intervals without causing processing delays for other commands, as the bus is not continuously occupied with control commands.
Solution Approach 2:
The system dynamically adjusts the control approach by combining periodic target setpoint determination with fade time-based transitions. The control unit determines new target setpoints periodically but allows smooth transitions over fade times, which maintains control precision dynamically without requiring immediate command execution, thereby reducing processing delays.
3Quantity of substance
If the number of control commands is reduced to minimize bus load, then the bus load decreases, but the control responsiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing optimal periodic intervals for command transmission. By determining target setpoints cyclically at predetermined intervals and combining this with fade time-based smooth transitions, the system reduces the total number of commands transmitted while maintaining control responsiveness. The periodic approach ensures that control actions are taken frequently enough to maintain responsiveness but not so frequently as to unnecessarily increase bus load.
Solution Approach 2:
The system maintains continuity of useful control action through fade time-based transitions. Even though commands are transmitted less frequently, the continuous fade transitions ensure that control actions are smoothly applied over time, maintaining effective control responsiveness without requiring frequent discrete commands. This continuous action approach compensates for the reduced command frequency.
Data Source
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AI summary
For the relative activation of a luminaire, actuation of an actuating element, particularly of a pushbutton, is detected. During actuation of the actuating element, the following steps are performed cyclically: ascertainment of a target control point (P_1, P_2) that corresponds to one of a plurality of sampling points (61, 62) encountered sequentially during the actuation; generation of a control command (71, 72) on the basis of the target control point (P_1, P_2); and issuing of the control command (71, 72) in order to reach a sampling point (61, 62) corresponding to the target control point (P_1, P_2) at a predefined change-over time (68). During continued actuation of the actuating element, a predefined period of time (68) is allowed to pass after a control command (71) is issued before a further control command (72) is issued in order to reach another sampling point (62) that corresponds to a further target control point (P_2).