DC-DC Converter Short Detection for Display Panels
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Solution Overview
Problem
Existing display devices face challenges in detecting short currents effectively, particularly during different operation modes, which can lead to heating and damage due to continuous power supply despite short events.
Innovation Solution
A DC-DC converter with a short detection unit that adjusts its short detection reference based on the operation mode of the display panel, generating a sensing current and voltage to determine if a short current is present, and shuts down the power supply when a short is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed short detection reference is used, then the detection threshold remains constant, but the detection accuracy deteriorates under different operation modes
Solution Approach 1:
The patent applies dynamics by making the short detection reference variable rather than fixed. The reference value is dynamically adjusted based on the operation mode of the display device, allowing the detection threshold to adapt to different operating conditions such as startup, normal operation, and power saving modes, thereby maintaining high detection accuracy across all modes
Solution Approach 2:
The patent changes the parameter of the detection reference based on operation mode. By monitoring the operation mode state and selecting different reference values accordingly, the system optimizes short current detection accuracy for each specific operating condition, resolving the contradiction between fixed threshold simplicity and adaptive detection precision
2Duration of action of stationary object
If power supply continues during short events, then continuous operation is maintained, but heating and damage occur
Solution Approach 1:
The patent implements feedback by continuously monitoring the current through the display device and comparing it against the dynamically adjusted short detection reference. When a short condition is detected, the system provides feedback to shut down the power supply, preventing continuous operation that would cause heating and damage while allowing normal continuous operation when no short is present
Solution Approach 2:
The patent applies preliminary anti-action by detecting short conditions before they cause significant heating or damage. The short detection unit continuously monitors for abnormal current conditions and preemptively shuts down the power supply when a short is detected, preventing the harmful effects of continued operation during short events
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
Effectively detects short currents in display panels by adjusting detection thresholds according to operation modes, preventing continuous power flow and potential damage during short events.
Implementation Method 1
The sensing current may flow through the sensing transistor and the level selection block, the sensing current being proportional to the current flowing through the power line coupled to the pass transistor
Data Source
AI summary
A DC-DC converter may include a voltage conversion unit and a short detection unit. The voltage conversion unit may be configured to generate a DC voltage for driving a display panel based on an input voltage. The short detection unit may be configured to generate a driving voltage based on the DC voltage and to output the driving voltage through a power line. The short detection unit may be configured to perform a short detection to detect whether the display panel is shorted based on a short detection reference that is adjusted according to an operation mode of the display panel.