Dynamic Voltage Scaling Interface for Low-Latency Power Control
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Solution Overview
Problem
Existing dynamic voltage scaling systems face issues with latency and inefficiency in adjusting power supply voltage to match processing demands, leading to excessive power dissipation and processing delays due to conservative open-loop or latency-prone closed-loop approaches.
Innovation Solution
A dynamic voltage scaling interface that monitors a DVS signal and provides an adjustment signal with low latency to a power supply, using a switcher system with a serial interface bus to incrementally adjust the supply voltage based on the duration of the DVS signal, allowing for real-time power management with minimal latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open loop system is used to control DVSI, then system simplicity is maintained, but power dissipation increases due to conservative operation with lots of margin
Solution Approach 1:
The patent implements a closed-loop feedback control system that monitors the actual voltage and frequency conditions and adjusts the DVSI accordingly. This feedback mechanism eliminates the need for conservative margins required in open-loop systems, reducing power dissipation while maintaining system reliability through real-time adaptation to actual operating conditions.
2Reliability
If closed loop system is used to compensate for process and temperature variations, then compensation accuracy is improved, but latency increases between voltage adjustment recognition and execution
Solution Approach 1:
The patent implements preliminary action by predicting future voltage adjustment needs based on current processing load trends and proactively adjusting the voltage before the full demand is realized. This predictive approach reduces latency by preparing the system in advance, while the compensation accuracy is maintained through continuous feedback verification that corrects any prediction errors.
3Productivity
If supply voltage is increased to increase processor clock frequency, then processing capacity is improved, but power dissipation increases
Solution Approach 1:
The patent implements dynamic voltage scaling that continuously adjusts the supply voltage to match the actual processing requirements. Instead of maintaining a fixed high voltage for maximum processing capacity, the system dynamically scales the voltage up or down based on real-time workload conditions, thereby achieving high processing capacity when needed while minimizing power dissipation during lower workload periods.
Data Source
AI summary
A switcher system or circuit and corresponding methods provide dynamic voltage scaling. One embodiment of an apparatus includes: a switcher controller configured to monitor a signal from a processor for a first state, determine a time that the signal is in the first state, and provide an adjustment signal based on the time, and a power supply coupled to the adjustment signal and configured to provide a variable supply voltage to the processor core, the variable supply voltage controlled by the adjustment signal after the determining a time.