Display Power Circuit With Adaptive Short-Circuit Detection Timing
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Solution Overview
Problem
Display devices face challenges in operating short circuit detecting circuits effectively at varying driving frequencies, leading to improper operation and potential battery lifespan reduction due to inconsistent leakage current and discharging times.
Innovation Solution
A power provider system with a short circuit detecting circuit that adjusts the short circuit detecting period and reference voltage level based on driving frequency, using a first and second power converter and a short circuit detecting circuit to maintain constant leakage current and discharging time, ensuring proper short circuit detection even at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving frequency is increased, then the productivity is improved, but the reliability of short circuit detection deteriorates
Solution Approach 1:
The patent applies dynamics by making the comparator's operating timing adaptive rather than fixed. The control circuit dynamically adjusts when the comparator operates based on the current driving frequency, ensuring that short circuit detection occurs at an appropriate time point regardless of frequency variations. This resolves the contradiction by allowing high productivity through frequency increases while maintaining detection reliability through adaptive timing adjustment.
Solution Approach 2:
The patent changes the timing parameter of the comparator's operation based on driving frequency. By adjusting the operating timing point as a variable parameter rather than a fixed value, the system maintains effective short circuit detection across different driving frequencies. This parameter change approach allows the system to accommodate higher frequencies while preserving detection accuracy.
2Device complexity
If the operating timing of the comparator is kept fixed, then the device complexity is reduced, but the measurement precision of short circuit detection deteriorates at high frequencies
Solution Approach 1:
Rather than implementing a complex fixed-timing system with multiple adjustment mechanisms, the patent uses a dynamic approach where the comparator's operating timing is adaptively controlled based on frequency. This achieves measurement precision without excessive complexity by allowing the system to self-adjust its timing characteristics according to operating conditions.
3Reliability
If the short circuit detecting period is extended to ensure detection accuracy, then the reliability is improved, but the loss of time increases
Solution Approach 1:
The patent adjusts the detection period parameter dynamically based on driving frequency. At higher frequencies, the detection period is appropriately shortened while maintaining reliability through adaptive timing. This parameter adjustment approach ensures sufficient detection reliability without incurring excessive time loss, as the period is optimized for current operating conditions rather than being unnecessarily extended.
Data Source
AI summary
A power provider includes: a first power converter to convert an input voltage, and output a first power voltage to a display panel through a first power line; a second power converter to convert the input voltage, and output a second power voltage to the display panel through a second power line; and a short circuit detecting circuit to detect a short-circuit of the first power line and the second power line in the display panel, by determining whether or not a level of a sensed voltage measured at the second power line is greater than or equal to a reference short circuit voltage level during a short circuit detecting period. The short circuit detecting circuit is to vary a length of the short circuit detecting period and the reference short circuit voltage level in response to a driving frequency.