SSD Standby Current Sensing for Progressive Defect Detection
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Solution Overview
Problem
Semiconductor storage devices, such as SSDs, face challenges in detecting abnormalities and improving reliability due to progressive defects and surge voltage issues, which can lead to malfunctions and are difficult to detect.
Innovation Solution
A method involving sensing standby current to detect abnormalities, with a step-wise control operation that includes notifying the host device, identifying defective chips, controlling operating voltage, and terminating defective chip operations based on reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used, then device complexity is reduced, but reliability detection capability is insufficient
Solution Approach 1:
The storage device performs self-diagnosis by monitoring its own standby current through built-in control circuits. The controller chip monitors current consumption of itself and memory chips during idle periods, enabling autonomous detection of progressive defects without requiring external testing equipment or complex monitoring systems.
Solution Approach 2:
The patent replaces traditional mechanical or external monitoring methods with electrical current sensing. By measuring standby current consumption through electrical parameters, the system achieves reliable abnormality detection without mechanical moving parts or complex external testing apparatus.
2Reliability
If progressive defects are detected early, then reliability is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent detects progressive defects by monitoring changes in standby current parameters over time. As memory cells degrade, their leakage current increases, causing measurable changes in total standby current. This parameter-based approach converts difficult-to-detect physical degradation into measurable electrical parameter variations.
Solution Approach 2:
The controller continuously monitors standby current and compares it against reference values, creating a feedback mechanism. When current exceeds thresholds, the system identifies defective chips and adjusts operations accordingly, enabling continuous detection and response to progressive defects throughout the device lifecycle.
3Reliability
If step-wise control operations are implemented, then reliability is improved through better abnormality management, but device complexity increases
Solution Approach 1:
The patent segments the control response into distinct steps based on abnormality severity. When defects are detected, the system executes differentiated control processes: identifying defective chip locations, adjusting voltage levels for affected chips, or terminating operations on severely degraded components. This segmented approach manages complexity by breaking down the control problem into discrete, manageable stages.
Data Source
AI summary
A method of operating a storage device includes sensing a standby current flowing through the storage device, determining based on the sensed standby current and at least one reference value whether a product abnormality has occurred within the storage device, and when it is determined the product abnormality has occurred, performing a step-wise control operation in which two or more control processes associated with an operation of the storage device are sequentially executed.