Dual-Chip Motor Control System for Disk Drive Silicon Area Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mass storage disk devices face challenges in reducing the size of power devices and related analog driving circuits while maintaining acceptable performance and power efficiency, as current fabrication technologies limit the integration of high-performance power devices and analog circuits.
Innovation Solution
A dual-chip silicon integrated control system is implemented, where one chip contains the logic control circuitry and the other chip houses the power devices and related driving circuitry, with dedicated interfaces for signal exchange, allowing for a reduction in silicon area and enhanced performance without increasing silicon area significantly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power devices and analog driving circuits are integrated on a single chip, then device integration is improved, but silicon area occupancy increases and power efficiency deteriorates
Solution Approach 1:
The control system is divided into two separate integrated circuits: a first integrated circuit dedicated to power devices and analog driving circuits, and a second integrated circuit for digital control logic. This segmentation allows each circuit to be optimized for its specific function, reducing the silicon area required for power devices while maintaining high integration for digital control.
2Adaptability or versatility
If power devices and analog driving circuits are integrated on a single chip, then device integration is improved, but power efficiency deteriorates
Solution Approach 1:
The control system is divided into two separate integrated circuits: a first integrated circuit dedicated to power devices and analog driving circuits, and a second integrated circuit for digital control logic. This segmentation allows each circuit to be optimized for its specific function, reducing the silicon area required for power devices while maintaining high integration for digital control.
3Manufacturing precision
If advanced 0.13 μm CMOS technology is used for logic circuits, then manufacturing precision is improved, but fabrication complexity increases
Solution Approach 1:
The control system is divided into two separate integrated circuits: a first integrated circuit dedicated to power devices and analog driving circuits, and a second integrated circuit for digital control logic. This segmentation allows each circuit to be optimized for its specific function, reducing the silicon area required for power devices while maintaining high integration for digital control.
Solution Approach 2:
Different fabrication technologies are applied to different parts of the system: 0.13 μm CMOS technology is used for the digital control logic to achieve high precision, while 0.35 μm BCD technology is used for power devices to optimize power efficiency. This local quality approach allows each component to be manufactured with the most appropriate technology for its specific requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a significant reduction of silicon area occupancy and fabrication costs while maintaining performance, achieved through the use of advanced 0.13 μm CMOS technology for logic circuits and 0.35 μm BCD technology for power devices, optimizing silicon area usage and power efficiency.
Implementation Method 1
Voice coil motors (VCM) are substantially composed of a winding immersed in a magnetic field generated by a permanent magnet. By forcing a certain current through the winding, the winding receives a displacing force.
Implementation Method 2
the disk is rotated by a brushless spindle motor
Implementation Method 3
BEMF Back electromotive force induced in the windings of the brushless motor.
Data Source
AI summary
An integrated control and power driving system moves a read/write head carrying arm over the surface of a disk. The integrated control and power driving system is applicable to a spindle motor, a mass storage disk drive and a voice-coil motor, for example, and includes a first chip and a second chip. The first chip integrates the output power stages driving the motors, and has an interface for outputting feedback signals representing functioning conditions of the voice-coil motor and of the spindle motor, and for receiving digital control signals of the output power stages. The second chip integrates logic drive and control circuitries of the power stages and an interface for receiving the feedback signals output by the first chip, and for transmitting to the first chip the digital control signals.