LED Lamp Power Control with Touch-State and OVP Detection
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Solution Overview
Problem
LED tube lamps using mains electricity pose safety hazards during installation due to potential electric shocks, and compatibility issues with incompatible power supplies can lead to improper functioning or damage, while traditional installation detection modules may fail under certain conditions.
Innovation Solution
A misuse warning module with a detection circuit to identify the type of external power supply and current level, generating warnings through a warning circuit when improper installation or power supply is detected, including features like a detection pulse generating module, switching circuit, and warning lights or buzzers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED tube lamps use mains electricity as power supply, then the LED lamps can operate with high efficiency and environmental protection characteristics, but safety hazards during installation occur due to potential electric shocks
Solution Approach 1:
The patent implements preliminary detection of installation status before power supply activation. The detection circuit checks whether the LED lamp is properly installed in the lamp holder, and only after successful detection does the system enable power supply. This preliminary action eliminates the electric shock hazard during installation while preserving the energy efficiency benefit of mains power operation.
Solution Approach 2:
The patent introduces an intermediary installation detection module between the mains power supply and the LED lamp circuit. This detection module acts as a mediator that verifies proper installation conditions before allowing power flow, thereby protecting installers from electric shock while maintaining the efficient mains power operation.
2Reliability
If traditional installation detection modules are used, then safety detection can be provided, but the detection modules may fail under certain conditions such as when connected to incompatible power supplies
Solution Approach 1:
The patent designs the installation detection module with multi-functional capability to detect various power supply types (mains electricity, electronic ballast, inductive ballast, DC power supply). The detection circuit can identify different power supply characteristics and adapt its detection logic accordingly, making the safety detection reliable across multiple power supply scenarios rather than failing under certain conditions.
Solution Approach 2:
The patent employs parameter-based detection where the detection circuit measures electrical parameters (voltage, current, frequency characteristics) to identify power supply type. By monitoring changes in these parameters, the system can distinguish between different power supply sources and adjust its operation to maintain reliable safety detection regardless of the specific power supply connected.
3Reliability
If detection circuits continuously monitor power supply type and current level, then safety and proper functioning can be ensured, but device complexity increases
Solution Approach 1:
The detection circuit is designed to self-identify the power supply type by monitoring inherent electrical characteristics without requiring external input or complex configuration. The circuit automatically adapts its detection parameters based on the connected power supply, reducing the need for additional components or complex control logic while maintaining reliable safety monitoring.
Solution Approach 2:
The patent implements a feedback mechanism where the detection circuit continuously monitors electrical parameters and provides feedback to the control system. Based on this feedback, the system adjusts its operation to ensure safe functioning. This feedback-based approach enables reliable safety monitoring through a relatively simple detection circuit that responds dynamically to actual operating conditions rather than requiring complex pre-programmed logic.
Data Source
AI summary
A method for controlling the power supply of an LED lamp is provided. The method includes following steps: issuing a plurality of pulses in a detection mode to determine whether a user touching state, in which a foreign external impedance is electrically connected to the LED lamp, is detected; entering a normal lighting mode if the user touching state is not detected and generating a driving signal provided, through a power loop, to an LED module of the LED lamp; sampling the driving signal to determine whether an overvoltage protection (OVP) condition is detected during the normal lighting mode; and limiting the amount of current flowing through the power loop by controlling the on/off state of a power switch electrically connected to the power loop if either the user touching state or the OVP condition is detected.