Power Supply Unit with Sensing Circuit for Abnormal Current Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light emitting displays, power supply units can suffer from short-circuits during manufacturing or usage, leading to potential fires if not stopped, and existing solutions lack easy adjustment of abnormal current values.
Innovation Solution
A power supply unit with a sensing circuit unit that includes a DC-DC converter, a sensing resistor, and an external resistor, which stops operation when abnormal current is detected, allowing for adjustment of the current threshold by changing the resistance value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply unit continues to operate without a sensing circuit, then the device complexity is reduced, but the reliability deteriorates due to potential short-circuits and fire hazards
Solution Approach 1:
The sensing circuit is configured to detect abnormal current conditions before they can cause short-circuits or fire hazards. The circuit proactively monitors current flow through the sensing resistor and prepares to stop operation in advance, preventing harmful effects rather than responding after damage occurs.
Solution Approach 2:
A sensing resistor is introduced as an intermediary element in the current path to detect abnormal conditions. This intermediary component enables the sensing circuit to monitor current flow without significantly affecting the main power supply function, providing a safe way to detect short-circuit conditions.
2Adaptability or versatility
If the abnormal current threshold is fixed in the DC-DC converter, then the device complexity is reduced, but the adaptability deteriorates due to inability to adjust current threshold
Solution Approach 1:
The current threshold adjustment function is segmented from the main DC-DC converter circuit. By separating the threshold setting function into an external resistor that can be independently configured, the patent enables adaptability without complicating the core converter design. Users can adjust the abnormal current threshold by simply changing the external resistor value.
Solution Approach 2:
The sensing circuit is designed with universal adaptability by using an external resistor for threshold adjustment rather than hardcoding the threshold in the converter. This allows the same circuit design to be used across different applications with varying current requirements, simply by changing the external resistor value.
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
Prevents additional damage by stopping the power supply unit when abnormal current is detected, and allows for easy adjustment of the current threshold without requiring complex modifications.
Implementation Method 1
the sensing circuit includes a sensing resistor; and an external resistor coupled to the resistor coupling terminal, where the first power generation unit is configured to output a current to the output terminal, the sensing circuit unit is configured to cause a stop in operation of the first power generation unit based on a value of a current flowing in the sensing resistor exceeding a predetermined value
Data Source
AI summary
Disclosed is a power supply unit including a DC-DC converter including an output terminal and resistor coupling terminal and an external resistor coupled to the resistor coupling terminal, where the DC-DC converter includes a first power generation unit which outputs a predetermined current to the output terminal, and a sensing circuit unit that includes a sensing resistor located between the first power generation unit and the output terminal and stops an operation of the first power generation unit depending on a current value flowing in the sensing resistor. A power supply unit and an organic light emitting display including the power supply unit include a sensing circuit unit that stops operation of the power supply unit to prevent an additional damage when an abnormal current occurs.