Current Balancer for Mitigating Rotational Vibration Noise
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Solution Overview
Problem
Data storage devices face challenges in managing current loads on internal voltage supplies, particularly when the total current load exceeds the host current limit, leading to potential power imbalances and rotational vibration (RV) noise.
Innovation Solution
A data storage device with a current balancer that samples the current drawn from a first voltage supply, maintains a difference based on a minimum peak current threshold, and draws a second current from a second voltage supply to satisfy the excess load, thereby mitigating RV noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the total current load on the first voltage supply exceeds the host current limit, then the power supply can meet the total load demand, but rotational vibration noise occurs and power imbalances arise
Solution Approach 1:
The patent divides the total current load into two separate supplies: a first voltage supply (e.g., 5V) with a host current limit and a second voltage supply (e.g., 12V) without such limitations. The current balancer selectively draws current from the second supply when the first supply approaches its limit, segmenting the load to prevent RV noise while meeting total power demands.
Solution Approach 2:
The current balancer acts as an intermediary device between the two voltage supplies and the load. It monitors the current drawn from the first supply and dynamically switches or modulates current drawing from the second supply to compensate when the first supply nears its limit, thereby preventing harmful RV noise effects.
2Reliability
If a current balancer is introduced to manage current loads and mitigate RV noise, then power balance is improved and RV noise is reduced, but device complexity increases
Solution Approach 1:
The current balancer is designed to autonomously monitor current levels from the first voltage supply and automatically adjust current drawing from the second voltage supply without external intervention. This self-regulating mechanism improves power balance reliability while minimizing the need for complex external control systems.
Solution Approach 2:
The current balancer dynamically changes operating parameters (current draw levels from each supply) based on real-time conditions. By monitoring the first supply's current and adjusting the second supply's contribution accordingly, the system maintains optimal power balance without requiring overly complex fixed-architecture designs.
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 mitigate rotational vibration (RV) noise, to sample a first current IH5V drawn from the first voltage supply, to maintain a difference between the first current IH5V and a current balancer threshold parameter IThreshold to be at least twice a minimum peak current minCurrentLimitpk amount required for turn on of the current balancer (IH5V−IThreshold≥2*minCurrentLimitpk), 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.