Lighting Control Circuit Shunt Resistance Voltage Drop
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Solution Overview
Problem
The reduction in voltage applied to a light-emitting element leads to a decrease in the amount of light emitted, making it difficult to visually recognize the lighting state.
Innovation Solution
A lighting control circuit with a light-emitting element and a first shunt resistance element connected in parallel, along with a control circuit that switches a current path between conducting and non-conducting states based on a potential difference threshold, ensuring increased current flow to the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage is reduced to protect the light-emitting element or reduce power consumption, then energy efficiency is improved, but the amount of light emitted decreases making it difficult to visually recognize the lighting state
Solution Approach 1:
The patent divides the current path into two separate parallel paths: one through the light-emitting element and another through a shunt resistance element. This segmentation allows independent control of current distribution, enabling the system to maintain sufficient light emission while reducing overall power consumption by directing current through the lower-resistance shunt path when voltage is reduced.
Solution Approach 2:
The shunt resistance element acts as an intermediary component that provides an alternative current path. When voltage decreases, current is diverted through the shunt resistance element rather than being forced through the light-emitting element, thereby preserving light emission intensity while allowing power reduction.
2Duration of action of moving object
If voltage is reduced to extend operation time or improve battery life, then duration of action is improved, but the lighting state becomes difficult to recognize
Solution Approach 1:
By segmenting the current into two parallel paths with different resistance characteristics, the system can extend operation time by utilizing the shunt resistance element as a power-saving path while maintaining visible light emission through the light-emitting element path through controlled current distribution.
Solution Approach 2:
The patent changes the resistance parameter configuration by introducing a shunt resistance element with specific resistance value that is lower than the light-emitting element's operating resistance. This parameter change enables the system to maintain adequate current through the light-emitting element even when overall voltage is reduced, thereby extending operation time while preserving visual recognizability.
3Illumination intensity
If a shunt resistance element is added to maintain current flow, then the amount of light emitted is maintained, but device complexity increases
Solution Approach 1:
The circuit is segmented into two simple parallel branches: one containing the light-emitting element and another containing the shunt resistance element. This segmentation, while adding one component, maintains circuit simplicity by avoiding complex control mechanisms and using basic parallel connection topology that is easy to implement and understand.
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 solution suppresses the reduction in voltage applied to the light-emitting element, thereby maintaining the amount of light emitted above a visual reference value even when the voltage decreases.
Implementation Method 1
a first shunt resistance element which is connected in parallel to the light-emitting element between the first terminal and the second terminal
Data Source
AI summary
A lighting control circuit includes: a light-emitting element which includes a first terminal and a second terminal; a first shunt resistance element which is connected in parallel to the light-emitting element between the first terminal and the second terminal; and a control circuit which turns, into a conducting state, a first current path extending between the first terminal and the second terminal via the first shunt resistance element when a potential difference between the first terminal and the second terminal is greater than a first threshold value and turns, into a non-conducting state, the first current path when the potential difference is smaller than the first threshold value.