Storage Device Power Switching to Reduce Leakage Current
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Solution Overview
Problem
Existing storage devices experience leakage currents due to transistor miniaturization, leading to inefficiencies and increased power consumption, particularly during power-saving modes.
Innovation Solution
A storage device with power switch cells and a power management circuit that dynamically adjusts power voltage magnitude based on operational mode, using power switch cells to supply or interrupt power to memory devices and controllers, minimizing leakage current and optimizing power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transistor miniaturization is used to increase storage capacity, then storage density is improved, but leakage current increases
Solution Approach 1:
The power supply system is segmented into multiple power switch cells (first power switch cell, second power switch cell, third power switch cell) that can independently control power supply to different circuit blocks. This segmentation allows selective power supply to minimize leakage current in inactive regions while maintaining power to active regions, resolving the contradiction between storage density and leakage current.
Solution Approach 2:
The power management circuit dynamically adjusts power supply states based on operational mode (first operating mode, second operating mode, third operating mode). In different modes, different power switch cells are activated or deactivated to optimize between storage capacity utilization and leakage current reduction, allowing the system to adapt to varying workload requirements.
2Speed
If power is continuously supplied to maintain operational readiness, then system responsiveness is improved, but power consumption increases
Solution Approach 1:
The system employs periodic power supply adjustment by switching between different operating modes. In low-power modes, power is periodically restored to circuit blocks as needed rather than continuously supplied. The power management circuit can quickly transition between power states, maintaining system responsiveness when required while reducing average power consumption during idle or low-activity periods.
Solution Approach 2:
The power management circuit autonomously controls power distribution to different circuit blocks based on detected operational requirements. When a circuit block needs to be activated, the power management circuit automatically enables the corresponding power switch cell, eliminating the need for continuous power supply while ensuring rapid response when operations are required.
3Loss of energy
If power switch cells are used to control power supply, then leakage current is reduced, but device complexity increases
Solution Approach 1:
The power management circuit serves multiple functions: it controls multiple power switch cells, detects operational modes, manages different power supply states, and coordinates power distribution across various circuit blocks. By consolidating these control functions into a single universal power management circuit, the patent reduces overall device complexity compared to having separate control mechanisms for each power switch cell.
Solution Approach 2:
Multiple power switch cells and their control logic are merged into an integrated power management circuit. This consolidation reduces the number of discrete components and simplifies the overall device architecture while maintaining the ability to independently control power supply to different circuit blocks, thereby reducing leakage current without proportionally increasing device complexity.
Data Source
AI summary
A storage device can decrease a leakage current. The storage device includes: a plurality of power switch cells for controlling power supplied to a memory device and a memory controller for controlling the memory device; a power management circuit for providing the plurality of power switch cells with a power voltage corresponding to the power; and a power management circuit controller for controlling the power management circuit to determine a magnitude of the power voltage according to whether the plurality of power switch cells supply the power to the memory device and the memory controller.