Parallel Capacitor Light String Circuit for Surge Current Protection
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Solution Overview
Problem
Conventional light strings experience surge currents that can burn out bulbs when a filament fails or a bulb is removed, disrupting the electrical path and causing the remaining lights to stop functioning.
Innovation Solution
Incorporating capacitors connected in parallel to each light, with optional zener diodes and resistors, to absorb surge currents and maintain a closed electrical path, ensuring continued operation of the light string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light strings are used without capacitors, then the structure is simple and cost-effective, but surge current burns out bulbs and the electrical path is interrupted when a bulb fails
Solution Approach 1:
A capacitor is introduced as an intermediary component connected in parallel with each light bulb. This capacitor serves as a mediator that provides an alternative current path when a bulb fails, preventing interruption of the electrical circuit while maintaining system reliability.
Solution Approach 2:
The capacitor is pre-installed in parallel with each light bulb to provide beforehand protection against surge current and bulb failure. When a bulb fails or is removed, the capacitor immediately provides a bypass path, cushioning the system against electrical interruption and protecting remaining bulbs from surge damage.
2Object-affected harmful factors
If capacitors are added to absorb surge current, then bulb burnout is prevented, but device complexity and cost increase
Solution Approach 1:
The capacitor acts as an intermediary that absorbs surge current while preventing it from damaging the light bulbs. By placing the capacitor in parallel with each bulb, it serves as a protective mediator that handles harmful electrical transients without requiring complex circuitry.
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 capacitors absorb surge currents, preventing bulb burnout and maintaining the electrical path even when a bulb fails or is removed, allowing the remaining lights to continue functioning safely.
Implementation Method 1
Each of the at least one capacitor is connected in parallel to a corresponding one of the lights... When the light string is powered on, a surge current may be generated and may burn out the light bulb mounted in a lamp base... the capacitor is charged and absorbs the surge current which may occur
Implementation Method 2
When the filament of the light bulb fails and the bulb remains in the string, or when the bulb is removed from its socket for replacement, the closed path for the flow of electrical current is interrupted and the remainder of the lamps in the string will no longer be illuminated... the closed path for flow of electrical current is still closed
Data Source
AI summary
A light string includes a number of lights. The lights are electrically connected in series and powered by an AC power supply. At least one capacitor is connected in parallel to one of the lights. Each light or a part of lights of the light string of the present invention is electrically connected in parallel to a capacitor. When the light string is powered on, the capacitor is charged and absorbs a surge current which may occur. Thus, the voltage dropped on each light rises slowly and the lights are safe. The capacitor also performs power compensation and electrical connection. When the filament of the light bulb fails and the bulb remains in the light string, or when the bulb is removed from its socket for replacement, the closed path for flow of electrical current is still closed.