Storage Power Management With Dynamic Voltage Slope Control
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Solution Overview
Problem
Storage devices, such as volatile or non-volatile memories, may fail to recognize memory devices due to the slope at which internal power voltage is supplied, leading to recognition failures and reduced reliability.
Innovation Solution
A power management device adjusts the slope of the internal power voltage in response to a flag signal from the controller when recognition failures occur, using a temperature sensor and data table to optimize the voltage slope based on ambient temperature, ensuring all memory devices are recognized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal power voltage is supplied at a fixed slope, then the power management device operates simply, but the controller may fail to recognize the memory device
Solution Approach 1:
The power management device dynamically adjusts the slope of the internal power voltage based on recognition status. When the controller fails to recognize the memory device, the power management device changes the voltage slope to a different value and retries recognition, transforming a static power supply system into a dynamic one that adapts to recognition failures.
Solution Approach 2:
The system implements feedback by monitoring whether the controller successfully recognizes the memory device and using this information to determine whether to adjust the power voltage slope. The power management device receives feedback about recognition status and modifies its operation accordingly, creating a closed-loop control system.
2Reliability
If the power voltage slope is changed multiple times, then memory device recognition reliability improves, but the time required for initial operation increases
Solution Approach 1:
The power management device periodically attempts recognition with different voltage slopes. When recognition fails with the current slope, it switches to another slope and attempts recognition again. This periodic switching between different voltage slopes continues until successful recognition is achieved or all slopes are exhausted.
Data Source
AI summary
A storage device including: a controller configured to be connected to an external host through an interface; a plurality of memory devices configured to store data; and a power management device configured to output an internal power voltage for an operation of the plurality of memory devices using an external power voltage received through the interface and having a flag signal pad for receiving a flag signal from the controller when the controller fails to recognize at least one of the plurality of memory devices, wherein, when the flag signal is received, the power management device changes a slope of the internal power voltage, and supplies the internal power voltage having the changed slope to the plurality of memory devices.