DC-DC Converter Voltage Level Selection for Display Panel Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional DC-DC converters in display devices stop supplying power to the display panel when an abnormal state is detected, such as a short circuit, leading to a loss of image display and potential damage to both the panel and the converter.
Innovation Solution
A DC-DC converter system that includes a first voltage converting circuit, a control block, and an abnormal state detector, which detects abnormal states and generates a current limit signal to change the second power supply voltage from a high to a lower voltage level, maintaining the first power supply voltage and reducing the voltage difference to prevent damage and allow continuous image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DC-DC converter stops supplying power to the display panel when an abnormal state is detected, then the display panel and DC-DC converter are protected from damage, but the display panel cannot display images anymore
Solution Approach 1:
The patent changes the voltage level parameter of the second power supply voltage when an abnormal state is detected. The control block selects a different voltage level from multiple available levels, thereby adjusting the voltage difference across the display panel to limit current while maintaining power supply, allowing continuous operation in a degraded but functional state.
2Productivity
If the DC-DC converter maintains power supply to the display panel in an abnormal state, then continuous image display is enabled, but the display panel and DC-DC converter may be damaged
Solution Approach 1:
The patent implements dynamic adjustment of the second power supply voltage level based on the abnormal state detection. The control block can switch between multiple voltage levels, making the system adaptable to different abnormal conditions. This dynamic response allows the system to maintain power supply for continuous display while adjusting parameters to prevent damage.
3Reliability
If the second power supply voltage is reduced to limit panel current, then the display panel is protected from damage, but the voltage difference between first and second power supply voltages decreases
Solution Approach 1:
The patent applies partial action by selecting a specific voltage level from multiple available levels rather than completely shutting down power or using a single fixed voltage. This allows the system to apply just enough voltage reduction to limit current to safe levels while maintaining sufficient power for continuous operation, avoiding excessive voltage reduction that would completely disable the display.
Data Source
AI summary
A direct current to direct current converter includes a first voltage converting circuit which converts an input voltage into a first power supply voltage, a control block which stores information about voltage levels of a second power supply voltage, receives an external control signal, and generates a voltage level selection signal indicating a first one of the voltage levels, a second voltage converting circuit which converts the input voltage into the second power supply voltage having the first one indicated by the voltage level selection signal, and an abnormal state detector which detects an abnormal state of a display panel, and provides a current limit signal to the control block when the abnormal state is detected. In response to the current limit signal, the control block generates the voltage level selection signal indicating a second one of the voltage levels regardless of the external control signal.