Peak Current Arbitration for Mobile Handset Subsystems
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Solution Overview
Problem
Modern mobile handsets with multiple subsystems face challenges in managing peak current consumption, leading to increased battery and power module complexity due to overlapping peak currents exceeding the battery's handling capacity.
Innovation Solution
A mechanism that allows high peak current subsystems to advertise their intent to initiate a current peak, with an arbitration scheme determining which subsystems are granted permission to do so, thereby limiting total current consumption to a predetermined level within the battery's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple subsystems operate independently with their own peak current demands, then each subsystem can function at full performance, but the total peak current consumption exceeds the battery and power module handling capacity
Solution Approach 1:
The patent implements an advertisement mechanism where subsystems notify the arbitration logic in advance of their intended peak current events. This preliminary notification allows the system to prepare and coordinate current usage before peaks occur, preventing overlapping demands that would exceed power module capacity while maintaining all subsystem functionalities.
Solution Approach 2:
The patent introduces arbitration logic as an intermediary component that receives advertisements from multiple subsystems, processes their peak current requests, and grants permission selectively. This mediator coordinates between subsystems and the power module, ensuring total current consumption remains within handling capacity while allowing necessary peak currents for proper subsystem operation.
2Power
If larger batteries are used to handle overlapping peak currents, then the power handling capacity increases, but the device size, weight, and cost increase
Solution Approach 1:
By implementing preliminary advertisement and arbitration mechanisms, the system proactively manages peak current demands before they occur. This allows the use of a smaller battery since the arbitration logic prevents overlapping peaks that would otherwise require excessive battery capacity, thereby reducing device weight while maintaining adequate power handling capability.
3Power
If larger batteries and more complex power modules are used to handle peak currents, then the power handling capacity increases, but the device complexity and cost increase
Solution Approach 1:
The advertisement and arbitration mechanism provides preliminary coordination of peak current events, allowing the power module to be designed for lower peak capacity since overlaps are prevented in advance. This reduces power module complexity and cost while maintaining adequate handling capacity for coordinated subsystem operation.
Solution Approach 2:
The arbitration logic serves as an intermediary that manages peak current coordination through software or firmware, replacing the need for complex hardware-based power management circuits. This software-based approach reduces overall device complexity and cost while providing effective peak current handling capability.
Data Source
AI summary
A novel and useful mechanism for regulating and managing the peak current consumption of the subsystems in a mobile handset device. The mechanism of the present invention is operative to limit the current consumption at any point in time to a predetermined level that is within the current handling capability of the power management system of the handheld device. The mechanism operates by having the high peak current subsystems advertise in advance their intention to initiate a current peak. An arbitration mechanism considers the advertisements or requests sent from interested subsystems and determines whether a subsystem is either granted permission to initiate or is blocked from initiating a peak current session.