Light Unit Delayed High Voltage Application for Worker Safety
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Solution Overview
Problem
Workers are at risk of electric shock during the connection process of high-voltage components in backlight units for liquid crystal displays due to the immediate application of high voltage.
Innovation Solution
The design includes an integrated power board that converts power supply into high voltage and supply voltage, with a terminal board that receives these voltages, and an inverter IC that delays the application of high voltage by a predetermined time after the supply voltage is received, reducing the risk of electric shock during connector fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high voltage is applied immediately to the lamp, then the lamp can be turned on quickly, but workers are at risk of electric shock during connector fastening
Solution Approach 1:
The system performs preliminary actions by first connecting the supply voltage and detecting lamp startup status before applying high voltage. The controller waits for a predetermined time after supply voltage connection to ensure safe conditions before enabling high voltage output, thereby preventing worker injury during connector fastening.
Solution Approach 2:
The system uses feedback mechanisms where the controller monitors the lamp's operational status and the time elapsed since supply voltage connection. Based on this feedback, the controller determines when it is safe to apply high voltage, creating a closed-loop safety system that prevents immediate high voltage application during dangerous transition periods.
2Productivity
If the connector is fastened quickly, then assembly time is reduced, but the risk of electric shock increases due to immediate high voltage application
Solution Approach 1:
The controller is configured to wait for a predetermined time period after supply voltage connection before enabling high voltage output. This preliminary delay ensures that even if workers fasten connectors quickly, the high voltage is not applied during the dangerous transition period, maintaining safety without significantly impacting assembly productivity.
3Object-affected harmful factors
If high voltage is applied after a delay, then worker safety is improved, but the lamp startup time increases
Solution Approach 1:
The system applies a partial delay (predetermined time) before high voltage application, which is sufficient to ensure worker safety during connector fastening but not excessively long to significantly impact lamp startup. This optimized delay balances safety requirements with minimal time loss, allowing the lamp to start up efficiently after the safety period elapsed.
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 delayed application of high voltage significantly reduces the risk of electric shock during the connector fastening process, ensuring worker safety.
Implementation Method 1
the inverter IC may transfer the high voltage to the T board after a predetermined time lapses from a time when the transistor is turned on by the supply voltage transferred from the second pad of the T board
Data Source
AI summary
A light unit includes: an integrated power (“IP”) board which receives power supply and converts the power supply into a high voltage and a supply voltage; a lamp; and a terminal board (“T board”) which receives the high voltage from the IP board to turn on the lamp, receives the supply voltage from the IP board to transfer the supply voltage to the IP board, in which the IP board transfers the high voltage to the T board after the IP board receives the supply voltage from the T board.