Constant-Brightness Lighting Controller for Decorative Strings
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Solution Overview
Problem
Decorative light strings powered by batteries often experience variations in brightness due to changes in battery charge and ambient temperature, leading to inconsistent lighting over time.
Innovation Solution
A constant-brightness lighting system that includes a light string controller with a battery compartment, load sensor, and switching supply, which senses the brightness and adjusts the power to maintain it within 10% of a target level, independent of battery voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If batteries are used to power decorative light strings, then the light strings can be used in locations without power sources, but the brightness varies as battery charge depletes
Solution Approach 1:
The system employs a feedback control mechanism where a sensor detects the actual brightness of the light string and feeds this information back to the controller. The controller compares the sensed brightness with the target brightness level and adjusts the power supplied by the battery to maintain constant brightness, thereby resolving the brightness consistency issue while preserving location flexibility
Solution Approach 2:
The system dynamically changes the electrical parameters (voltage or current) supplied to the light string based on battery charge level and sensed brightness. By adjusting these parameters in real-time, the system compensates for battery depletion effects and maintains constant brightness output despite varying battery conditions
2Duration of action of stationary object
If battery voltage varies with charge depletion, then power supply capability changes over time, but maintaining constant brightness requires active control
Solution Approach 1:
A feedback control loop is implemented where the controller continuously monitors brightness via a sensor and adjusts power output accordingly. This active control mechanism extends operational duration by optimizing battery usage while maintaining constant brightness, at the cost of increased device complexity due to the control circuitry
Solution Approach 2:
The system performs self-regulation by automatically sensing its own brightness output and adjusting its power consumption accordingly. This self-service capability allows the system to maintain constant brightness without external intervention, extending operational duration while the control complexity is contained within the autonomous system
3Adaptability or versatility
If ambient temperature changes affect battery performance, then power supply capability varies, but brightness should remain constant
Solution Approach 1:
The feedback control system senses brightness variations caused by temperature-induced battery performance changes and compensates by adjusting power supply. This maintains brightness stability despite environmental temperature variations, while the system adapts to different environmental conditions through active control
4Adaptability or versatility
If additional light strings are connected, then total power demand increases, but brightness per string should be maintained
Solution Approach 1:
The controller uses brightness sensing feedback to detect when additional light strings are connected and adjusts the power supply to maintain the target brightness level for each string. This allows system expandability while preserving brightness consistency through active power management
Solution Approach 2:
The system dynamically adjusts its power output based on the total load connected. When additional light strings are added, the controller modifies the operating parameters (voltage/current) in real-time to maintain constant brightness per string, demonstrating dynamic adaptation to changing system configuration
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
The system ensures consistent brightness of decorative light strings, maintaining their aesthetic appeal even as battery conditions change or additional lighting elements are added, and adapts to temperature variations.
Implementation Method 1
a switching supply configured to draw operating power from the one or more batteries received by the battery compartment and to supply lighting power to the light string connected to the light-string controller
Implementation Method 2
The light-string controller includes a load sensor configured to sense a signal indicative of a brightness of the light string connected to the light-string controller
Data Source
AI summary
Apparatus and associated methods relate to providing a constant-brightness lighting power to one or more interconnected light strings. A light string power controller draws operating power from a power source that has a variable voltage. The light string power controller supplies constant-brightness lighting power to the one or more interconnected light strings connected to a light-string connector. The constant brightness operating power is both independent of the variable voltage of the power source and independent of a number, up to a predetermined maximum number, of the one or more interconnected light strings connected to the light-string connector. Additional light strings can be connected to the one or more interconnected light strings without affecting a brightness of the one or more interconnected light strings. The brightness of the one or more interconnected light strings is similarly unaffected by voltage variations of the power source.