Electronic System Current Conservation Mechanism
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Solution Overview
Problem
Modern electronic devices face challenges in reducing peak current load while maintaining performance and extending battery life, as the demand for higher storage capacity and faster interface protocols increases, leading to conflicting requirements of size, cost, and performance.
Innovation Solution
The electronic system employs a current conservation mechanism that reduces peak current amplitude by using control circuitry to manage power supply current through coasting of the media motor and harvesting of free-wheel current, allowing the head actuation motor to operate within a reduced power demand, thereby maintaining system performance and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the storage capacity and data frequency are increased to meet modern data demands, then the data capacity and interface speed are improved, but the peak current load increases
Solution Approach 1:
The control circuitry performs preliminary action by harvesting and storing energy in the energy storage device during periods when the media motor is decelerating or coasting. This stored energy is then made available during high-current operations, allowing the system to support high data capacity and fast interface protocols without proportionally increasing peak current draw from the power supply.
2Duration of action of moving object
If the peak current load is reduced to extend battery life, then the battery life is improved, but the system performance and storage capacity are compromised
Solution Approach 1:
The energy storage device acts as an intermediary between the power supply and the media motor. It buffers the power delivery by storing energy during low-demand periods and releasing it during high-demand operations, enabling the system to maintain high storage capacity and performance while operating on battery power for extended periods.
3Stability of the object's composition
If the media motor is continuously driven to maintain media rotation, then the media speed stability is improved, but the power consumption increases
Solution Approach 1:
Instead of continuous driving, the system employs periodic action by allowing the media motor to coast during certain periods and applying drive pulses periodically to maintain rotation. The control circuitry manages this periodic operation while using the energy storage device to ensure sufficient power is available when needed, reducing overall power consumption while maintaining adequate media speed stability.
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 significantly reduces the operational maximum current demand, providing extended battery life in portable systems, reduced thermal and electrical requirements, and increased reliability by maintaining a stable power supply current, while allowing for cost-effective and efficient system design.
Implementation Method 1
harvesting of free-wheel current
Data Source
AI summary
An apparatus includes: a media motor; a media mounted on the media motor; a head, over the media, the motion of the head controlled by a head actuation motor; a motor driver, coupled to the media motor, configured to adjust a media speed; and control circuitry configured to: coast the media motor in preparation for accelerating the head, and activate the head actuation motor including accelerating the head in a first direction for repositioning the head over the media.