Data Storage Overvoltage Protection via Isolation Circuit
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Solution Overview
Problem
Data storage devices are vulnerable to overvoltage events caused by voltage transients or load transients in host power supplies, which can lead to damage and data corruption, necessitating effective overvoltage protection mechanisms.
Innovation Solution
Incorporating isolation circuits in both host low and high voltage supply lines and within the power device, along with control circuitry that uses ADC channels for monitoring and a backup circuit to isolate supply lines during overvoltage events and provide a backup voltage for continued operation and safe shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation circuits are added to protect against overvoltage events, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces isolation circuits as intermediary components between the host power supply and the data storage device power supply. These isolation circuits act as mediators that block harmful overvoltage transients from reaching the storage device while allowing normal power delivery, thus protecting the device without requiring fundamental redesign of the power architecture
Solution Approach 2:
The power supply system is segmented into distinct isolated sections: host power supply, isolation circuits, and data storage device power supply. This segmentation allows the isolation circuits to be placed at specific points (both inside and outside the power device) to divide and control voltage isolation, providing protection while maintaining manageable system complexity through modular placement
2Reliability
If multiple isolation circuits are implemented in host supply lines and within power device, then overvoltage protection is improved, but manufacturing complexity increases
Solution Approach 1:
The isolation protection is segmented into two implementation locations: outside the power device (in host supply lines) and inside the power device. This segmentation allows manufacturers to choose the most suitable location based on their specific design constraints, and enables modular assembly where isolation circuits can be integrated at different stages of the power delivery path
Solution Approach 2:
The isolation circuits are designed to serve multiple functions: protecting against overvoltage events, isolating power supply lines, and maintaining normal power delivery. This multi-functionality reduces the need for additional separate protection mechanisms, thereby limiting the increase in manufacturing complexity despite the added protection capabilities
Data Source
AI summary
A data storage device coupled to a host power supply is disclosed and includes a spindle motor and Voice Coil Motor (VCM) circuitry, a power device coupled to the host power supply via a first host supply line and coupled to the spindle motor and VCM circuitry, wherein the power device comprises a first voltage rail, a first isolation circuit, and control circuitry, wherein the power device receives a first supply voltage on the first voltage rail via the first host supply line and provides the first supply voltage to the spindle motor and VCM circuitry via the first isolation circuit, and wherein the control circuitry is operable to monitor the first voltage rail for an overvoltage event and, when the overvoltage event is detected, control the first isolation circuit to disconnect the spindle motor and VCM circuitry from the first voltage rail.