Constant-Brightness Controller for Decorative Light Strings
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Solution Overview
Problem
Decorative light strings powered by batteries experience variations in brightness due to changes in battery charge and ambient temperature, leading to inconsistent illumination over time.
Innovation Solution
A modular constant-brightness lighting system that includes a light-string load detector and power converter, which senses the power level of connected light strings and adjusts the power supply to maintain consistent brightness, independent of battery voltage and temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If batteries are used to provide power to decorative light strings, then power supply is available in difficult-to-tap locations, but brightness varies due to battery charge depletion and temperature changes
Solution Approach 1:
The system employs a load detector that continuously monitors the power level of connected light strings and feeds this information back to a power converter. The power converter adjusts its output based on this feedback to maintain constant brightness, resolving the contradiction between battery power availability and brightness consistency.
Solution Approach 2:
The power converter dynamically adjusts its power output in response to changing battery conditions. By making the power supply adaptive rather than static, the system maintains consistent brightness despite battery charge depletion and temperature variations.
2Illumination intensity
If a power converter adjusts power output to maintain constant brightness, then illumination consistency is improved, but system complexity increases
Solution Approach 1:
The patent introduces a load detector as an intermediary component between the battery power source and the light strings. This intermediary monitors power levels and enables the power converter to make informed adjustments, achieving brightness consistency while keeping the overall system architecture relatively simple and modular.
3Measurement precision
If load detector and power converter are added to the system, then brightness control precision is improved, but device complexity increases
Solution Approach 1:
The load detector serves multiple functions: it detects power levels, communicates battery status to users, and provides data for power converter control. By making this component multi-functional, the patent achieves precise power level monitoring without proportionally increasing system complexity.
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 by adaptively controlling power delivery, maintaining illumination levels regardless of battery charge depletion, additional lighting elements, or ambient temperature changes.
Implementation Method 1
The power converter is configured to draw operating power from a power source and provide power to the one or more connected decorative light strings at the power level indicated by the detected load-response signal
Implementation Method 2
A plurality of lighting elements distributed along the decorative light string and configured to receive operating power via the first and second conductors
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 thereto. The power controller can send a load-query signal the one or more interconnected light strings connected thereto. The connected light strings respond to the query with a load-response signal, which is indicative of a power level corresponding to an illumination value of the one or more interconnected light strings. The load-response signal can be indicative of a total number of lighting elements of the one or more interconnected light strings, for example. Similarly, the load-response signal can be indicative of a desired power level for a predetermined illumination level of the one or more interconnected light strings.