Electrical Load Control System with Voltage Clipping Indicator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional systems for controlling electrical loads, such as those with LED or fluorescent bulbs, face issues where the signaling indicator light can cause low illumination of the bulb when the switch is open due to insufficient current, leading to visibility problems, especially with low-consumption bulbs.
Innovation Solution
A system that includes a control device connected in series or parallel with the switch and signaling indicator, which limits the voltage across the electrical load below a threshold value, using clipping devices like Transil diodes or a dimmer to absorb voltage differences and control indicator power, ensuring the indicator remains invisible by only powering during specific voltage phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the control current of the indicator light is reduced to prevent bulb illumination, then the indicator light becomes very inconspicuous and difficult to see, but the bulb remains dark as desired
Solution Approach 1:
The patent introduces a capacitor as an intermediary energy storage element connected in parallel with the bulb. This capacitor absorbs excess energy during voltage peaks and releases it during zero-crossing periods, enabling the indicator light to operate with reduced current while preventing bulb illumination. The capacitor mediates between the indicator light's need for sufficient current and the bulb's need to remain dark.
Solution Approach 2:
The patent utilizes the periodic nature of AC voltage cycles, specifically operating the indicator light during zero-crossing periods when the voltage passes through zero. By synchronizing indicator light operation with these periodic zero-crossing moments, the system provides visible indication while ensuring the bulb receives insufficient continuous power to illuminate, thus resolving the contradiction between indicator visibility and bulb darkness.
2Object-affected harmful factors
If a capacitor is connected in parallel with the light bulb to control current, then the bulb illumination issue is addressed, but the solution proves impractical to implement
Solution Approach 1:
The patent merges the capacitor's energy storage function with the existing indicator light circuitry. Instead of adding a separate complex control system, the capacitor is integrated into the parallel circuit configuration with the indicator light and bulb, utilizing the existing AC voltage cycles and component interactions to achieve the desired current control without requiring additional practical implementation 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
Effectively prevents any illumination of the bulb when the switch is open, maintaining visibility without unnecessary light, and is compatible with all types of bulbs, including low-consumption ones, by ensuring the indicator only consumes sufficient current during specific voltage conditions.
Implementation Method 1
a clipping device arranged to absorb the difference between the voltage supplied by the electrical network and the voltage threshold value
Implementation Method 2
the clipping device comprises two Transil diodes connected in series
Implementation Method 3
the control device comprises a dimmer arranged to allow the signaling indicator to be powered before or after the zero crossing of the voltage supplied by the network
Data Source
Figure 1~2B
Figure 3A~3C
Figure 4A~4B
AI summary
The invention relates to a control system for an electrical load intended to receive a voltage (VR) supplied by an electrical network and comprising: - a control switch (SW), arranged to take an open state or a closed state, - a signaling indicator (L2) connected in parallel with the switch (SW) and arranged to take two distinct states each linked to the open state or the closed state of the switch (SW), - a control device (1) connected to the signaling indicator (L2) and arranged to limit a voltage across the terminals of the electrical load below a threshold value when the switch (SW) is in the open state.