Driver Arrangement Synchronizing Capacitor Charging for Uniform Lighting
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Solution Overview
Problem
In lighting units with two independently controlled drivers, the differing charging rates of output capacitors lead to a time lag between lighting modules, causing color and brightness shifts over time, resulting in non-uniform light output.
Innovation Solution
A driver arrangement where a first driver can charge a second output capacitor when predetermined criteria are met, such as a significant difference in charging rates, allowing for synchronization of charging rates and voltage levels between the capacitors, using a voltage trigger arrangement like a Zener diode to facilitate this.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two independently controlled drivers are used to charge separate output capacitors, then each lighting module can be controlled accurately with higher power support, but the charging rates of the capacitors differ causing time lag and color/brightness shifts
Solution Approach 1:
The patent introduces an intermediary electronic path between the first driver and second output capacitor that acts as a mediator. When the first driver's output voltage exceeds the second output capacitor's voltage by a threshold, current flows through this intermediary path to charge the second capacitor, balancing the charging rates and eliminating the time lag that causes color shifts.
Solution Approach 2:
The system implements feedback by continuously monitoring the voltage difference between the first driver output and the second output capacitor. When the voltage difference exceeds a predetermined threshold, the feedback mechanism activates the intermediary electronic path to equalize the charging rates, thereby maintaining stable and uniform light output from both lighting modules.
2Adaptability or versatility
If drivers are set with different output currents to control lighting modules, then light of different colors and patterns can be output, but the charging rates of output capacitors become significantly different causing visible color changes
Solution Approach 1:
The patent applies preliminary action by proactively monitoring the voltage difference between drivers and preemptively activating the intermediary charging path. Before a significant time lag can develop between capacitor charging, the system detects the voltage threshold condition and initiates additional charging current through the first driver to the second capacitor, preventing the delay that causes visible color changes.
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
This approach ensures that both output capacitors reach the turn-on voltage simultaneously, maintaining uniform light characteristics and reducing visible color changes during startup, thereby enhancing the consistency and responsiveness of the lighting unit.
Implementation Method 1
The first electronic path comprises a voltage trigger arrangement connected between the first output capacitor and the second output capacitor, wherein the voltage trigger arrangement is adapted to, in response to a difference between the voltage across the first output capacitor and the voltage across the second output capacitor reaching or exceeding the first predetermined value, become conductive and permit the first driver to charge the second output capacitor
Data Source
AI summary
A driver arrangement for a lighting unit. The drive arrangement comprises an independent first driver mainly for driving a first output capacitor and an independent second driver configured to mainly driving the second output capacitor. The driver arrangement is configured to allow an independent first driver to charge the second output capacitor when one or more predetermined criteria are met.