DC-DC Converter Current Sensing for OLED Short Circuit Protection
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Solution Overview
Problem
Organic light emitting displays (OLEDs) are prone to failure and potential fire due to short circuits in power source lines, which existing DC-DC converters cannot effectively prevent, especially under shock conditions.
Innovation Solution
A DC-DC converter design incorporating a boost converter and an inverting converter with switching elements and a current sensing unit, which controls the switching elements to reduce current flow and shut down when excessive current is detected, preventing overloads and potential fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC-DC converter supplies power to OLED pixels through power source lines, then the display can operate with required power voltages, but short circuits may occur due to shock during use, causing failure or fire
Solution Approach 1:
The patent implements preliminary protective actions by incorporating a current sensing unit that continuously monitors current before dangerous levels are reached, and by designing a controller that can preemptively respond to abnormal conditions. The system prepares protection mechanisms in advance rather than reacting only after failure occurs.
Solution Approach 2:
The patent employs feedback mechanisms through the current sensing unit that continuously monitors current flow and provides real-time information to the controller. This feedback loop enables the system to detect abnormal current conditions and automatically adjust switching element operations to prevent short circuits and potential fires.
2Reliability
If existing DC-DC converters are used without enhanced protection, then the device complexity remains low, but they cannot effectively prevent short circuit failures under shock conditions
Solution Approach 1:
The patent introduces intermediary protective components between the power source and load. The current sensing unit acts as an intermediary that monitors current flow, and the controller serves as an intermediary that mediates between the sensing unit and switching elements, coordinating protection actions without requiring complete system redesign.
Solution Approach 2:
The protection system is self-service in that it automatically detects abnormal conditions through the current sensing unit and responds without external intervention. The controller autonomously adjusts switching element operations based on sensed current levels, providing self-protecting functionality that reduces the need for external protection circuits.
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 solution effectively reduces current flow and prevents overloads, thereby preventing failures and fires in OLED displays by rapidly shutting down the converters when a short circuit is detected, ensuring the safety and reliability of the organic light emitting display.
Implementation Method 1
a current sensing unit for sensing an amount of current that flows through the first inductor
Data Source
AI summary
A DC-DC converter and an organic light emitting display including the same are disclosed. The DC-DC converter generates first and second power voltages for the organic light emitting display with an inverting converter and a boost converter. The current of the converters is monitored, and if the currents exceed a threshold, the associated converter is stopped to prevent further damage to the display.