Dynamic Voltage Frequency Scaling Control via Delay Mapping
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Solution Overview
Problem
Dynamic voltage frequency scaling methods face a conflict between reducing electric power consumption and improving performance, as they either lead to high power consumption or operation reactivity degradation due to fixed sampling rates.
Innovation Solution
A method and apparatus that control the duration time of driving frequencies by using a delay mapping table to determine when to change between different frequency levels, optimizing power consumption and performance based on load rates and operational patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the sampling rate for measuring system load is reduced, then electric power consumption is minimized, but the cycle of increase in driving frequency becomes fast causing high electric power consumption
Solution Approach 1:
The patent applies dynamics by making the sampling rate adjustable rather than fixed. The sampling rate is dynamically changed based on the current driving frequency level and operational conditions, allowing the system to optimize between power consumption and performance response. This resolves the contradiction by enabling adaptive measurement frequency that balances energy efficiency with operational responsiveness.
Solution Approach 2:
The patent changes the parameter of sampling rate based on driving frequency levels. Different sampling rates are selected according to whether the system is operating at higher or lower frequency levels, which optimizes the balance between power consumption and performance monitoring accuracy. This parameter adaptation allows the system to reduce sampling frequency (saving power) when operating at lower frequencies while maintaining adequate performance tracking.
2Productivity
If the sampling rate of dynamic voltage frequency scaling algorithm is increased, then operation reactivity is improved, but electric power consumption increases
Solution Approach 1:
The patent makes the sampling rate dynamic and condition-based rather than fixed at high levels. By adjusting the sampling rate according to current operational state and driving frequency, the system maintains adequate operation reactivity when needed while significantly reducing power consumption during stable or low-demand periods. This dynamic adaptation directly resolves the contradiction between reactivity and power consumption.
Solution Approach 2:
The patent implements periodic sampling at variable intervals rather than continuous high-frequency sampling. The sampling period is adjusted based on system state, allowing the system to maintain operational awareness through periodic measurements while reducing overall sampling frequency to minimize power consumption. This periodic action with variable periods balances reactivity requirements with energy efficiency.
3Ease of manufacture
If fixed sampling rate is used in dynamic voltage frequency scaling, then implementation is simple, but the system cannot optimize between power consumption and performance
Solution Approach 1:
The patent transitions from fixed to dynamic sampling rate implementation. While this increases some implementation complexity, it enables the system to optimize power consumption by adapting the sampling rate to actual operational needs. The dynamic approach allows the system to reduce sampling frequency when performance optimization is not critical, thereby reducing power consumption while maintaining adequate functionality.
Solution Approach 2:
The patent changes the sampling rate parameter based on driving frequency levels and operational conditions. This parameter adaptation enables the system to optimize power consumption by selecting appropriate sampling rates for different operational states. Although this requires additional control logic, it achieves significant power savings compared to fixed high sampling rates, making the increased implementation complexity worthwhile for power-constrained applications.
Data Source
AI summary
Disclosed is an operating method of an electronic apparatus. The method includes measuring the load rate of the electronic apparatus that operates at the first driving frequency level. The method also includes determining a second driving frequency level based on the measured load rate. The method further includes determining whether or not to change the first driving frequency level into the second driving frequency level after the operational duration time of the first driving frequency level. The method includes based on determining the change from the first driving frequency level to the second driving frequency level, controlling to operate at the first driving frequency level or the second driving frequency level.