LED Lamp Switching Circuit for Electric Shock Protection
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Solution Overview
Problem
LED lamps lack effective protection against electric shocks when installed, particularly due to the absence of a protection circuit in the ballast, and mechanical switches are prone to contact failures from vibration, leading to unstable power supply.
Innovation Solution
Incorporating a switching circuit between the rectifier circuit and the LED circuit, utilizing switching elements like SCR, TRIAC, FET, and driving elements such as condensers and diodes to prevent electric shocks by controlling the flow of current based on reference currents and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a mechanical switch is installed in the terminal unit to prevent electric shock, then electric shock protection is improved, but contact failure occurs due to vibration and coupling issues leading to unstable power supply
Solution Approach 1:
The patent replaces the mechanical switch with an electronic switching circuit that uses semiconductor components (such as triacs, transistors, or MOSFETs) controlled by voltage or current signals. This electronic switching mechanism eliminates mechanical contact parts that are susceptible to vibration and coupling issues, thereby maintaining reliable power supply while providing electric shock protection through controlled switching action.
Solution Approach 2:
The patent introduces an intermediary switching circuit between the terminal unit and the load that acts as a controlled mediator. This circuit uses voltage detection and control signals to manage the connection state, providing both protection functionality and stable power control without direct mechanical contact, thus resolving the contradiction between protection and reliability.
2Device complexity
If no protection circuit is installed in the ballast, then device complexity is reduced, but electric shock hazard increases when user contacts the terminal
Solution Approach 1:
The patent extracts the protection function from the traditional ballast circuit by implementing a separate switching circuit in the terminal unit. This separation allows the ballast to remain simple while the extracted protection mechanism independently provides electric shock prevention through controlled switching, thus reducing overall system complexity while enhancing safety.
Solution Approach 2:
The patent segments the protection function into a distinct switching circuit module within the terminal unit, separate from the main ballast circuit. This segmentation enables independent optimization of each function - the ballast remains simple for power factor correction and voltage regulation, while the switching circuit provides specialized protection functionality, resolving the contradiction between simplicity and safety.
Data Source
AI summary
Disclosed is an LED lamp using a switching circuit, configured to prevent occurrence of electric shock caused by a contact of a conductive metal or the human body by arranging the switching circuit between a first rectifier circuit and an LED circuit. The disclosed LED lamp using a switching circuit connects the switching circuit to at least one line among a plurality of lines connecting a rectifier circuit and an LED circuit, wherein the switching circuit may comprise: a switching element comprising at least one from among an SCR, a TRIAC, a TR, and an FET; and a driving element comprising at least one from among a capacitor, a TVS, a ZENER, a SIDAC, a resistance, and an inductor.