Current Balancer for Adaptive Power Supply Control
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Solution Overview
Problem
Data storage devices face challenges in managing current loads, where the total current load on the low voltage supply exceeds the host current limit, necessitating additional current sourcing from other supplies to avoid exceeding this limit, leading to potential power consumption inefficiencies.
Innovation Solution
A data storage device with a current balancer system that samples the current drawn from the low voltage supply, adjusts the current from a high voltage supply to meet the excess load, using a system-on-a-chip (SoC) to generate threshold voltage and gain parameters for the current balancer, ensuring the low voltage supply current remains within the host current limit while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the low voltage supply current is increased to meet the total load demand, then the power consumption is improved, but the host current limit is exceeded
Solution Approach 1:
The patent segments the power supply into two distinct voltage sources: a low voltage supply (first voltage supply) and a high voltage supply (second voltage supply). The current balancer divides the total power demand between these two supplies, allowing the low voltage supply to operate within its current limit while the high voltage supply compensates for the remaining power requirements. This segmentation resolves the contradiction by separating the power delivery functions.
Solution Approach 2:
The current balancer acts as an intermediary device between the two voltage supplies and the load. It dynamically adjusts the current drawn from each supply based on real-time conditions, ensuring that the low voltage supply never exceeds the host current limit while maintaining adequate total power delivery. The intermediary balances the power distribution to satisfy both the power consumption requirement and the current limit constraint.
2Reliability
If the high voltage supply current is increased to compensate for low voltage supply limitations, then the host current limit compliance is improved, but the power consumption efficiency deteriorates
Solution Approach 1:
The current balancer implements dynamic current adjustment by continuously monitoring the low voltage supply current and adaptively modifying the high voltage supply current in real-time. Rather than using a fixed high voltage current setting, the system responds to changing load conditions and low voltage supply capabilities, optimizing the power distribution efficiency while ensuring host current limit compliance at all times.
Solution Approach 2:
The system employs feedback control where the current balancer monitors the actual current drawn from the low voltage supply and uses this information to adjust the high voltage supply current accordingly. The feedback loop ensures that when the low voltage supply can meet the demand, the high voltage supply current is reduced, and when additional current is needed, the high voltage supply compensates. This feedback mechanism optimizes power consumption efficiency while maintaining reliability.
3Device complexity
If a fixed current balancer configuration is used, then the device complexity is reduced, but the adaptability to varying load conditions deteriorates
Solution Approach 1:
The current balancer is designed with dynamic adjustment capabilities that allow it to adapt to varying load conditions, voltage levels, and current requirements. The system can modify the current distribution between the two voltage supplies in real-time based on operational conditions, providing versatility without requiring complex reconfiguration of the overall device architecture.
Solution Approach 2:
The current balancer adjusts operational parameters such as current magnitude and voltage selection based on detected load conditions. By changing these parameters dynamically rather than requiring structural reconfiguration, the system achieves high adaptability to different operating scenarios while maintaining relatively simple device complexity. The parameter changes enable the system to optimize performance across varying conditions.
Data Source
AI summary
A data storage device comprises a disk; a head configured to read data from and write data to the disk; and a current balancer configured to receive a first voltage supply having a load limit and to receive a second voltage supply. The current balancer is further configured, to reduce power consumption, to sample a first current drawn from the first voltage supply, to maintain the first current at a target level that approximately equals the load limit, and to draw a second current from the second voltage supply to satisfy a part of a total load on the first voltage supply that exceeds the load limit.