Fan MPPT Control Using a Second-Order Sliding Mode Observer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fan power control methods result in unnecessary energy loss due to response delays and inefficient speed adjustments, as they rely on sensing hardware threshold values and do not effectively maintain the fan at the maximum power point.
Innovation Solution
A second-order sliding mode observation-based method that estimates the maximum power point of the fan using a nonlinearly controlled observer, allowing for automatic fine-tuning by controlling the PWM switch to maintain stable operation at this point, thereby optimizing system and hardware efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotational speed of the fan is controlled by sensing hardware threshold values, then the fan can be adjusted automatically according to temperature, but response delay occurs and unnecessary energy loss is incurred
Solution Approach 1:
The patent applies preliminary action by estimating the maximum power point of the fan using a nonlinearly controlled second-order sliding mode observer before actual speed adjustment is needed. This allows the system to proactively determine optimal operating parameters and make timely control adjustments, eliminating response delays and preventing unnecessary energy consumption during temperature transitions
2Ease of operation
If the rotational speed of the fan is controlled by sensing hardware threshold values, then the fan can be adjusted automatically according to temperature, but response delay occurs
Solution Approach 1:
The patent applies preliminary action by estimating the maximum power point of the fan using a nonlinearly controlled second-order sliding mode observer before actual speed adjustment is needed. This allows the system to proactively determine optimal operating parameters and make timely control adjustments, eliminating response delays and preventing unnecessary energy consumption during temperature transitions
Solution Approach 2:
The patent implements feedback through a closed-loop control system that continuously monitors fan operation and uses a second-order sliding mode observer to estimate the maximum power point. The system compares actual performance with estimated optimal values and continuously adjusts control parameters, ensuring rapid response to temperature changes and eliminating delays associated with traditional threshold-based sensing
3Productivity
If a conventional control method is used, then the control system is simple, but the fan cannot operate efficiently at the maximum power point
Solution Approach 1:
The patent replaces traditional mechanical threshold-based control with an advanced computational approach using a nonlinearly controlled second-order sliding mode observer. This substitution enables precise estimation of the fan's maximum power point and implements continuous optimization of operating parameters, significantly improving fan efficiency while the modular implementation keeps system complexity manageable
Data Source
AI summary
Provided area second-order sliding mode observation-based fan power control method and system. The method includes: calculating, by second-order sliding mode observation, an observed rotational speed value of a fan, and calculating a maximum power reference current corresponding to maximum power of the fan according to a relational expression between the rotational speed and maximum power point; and performing, by controlling a Pulse Width Modulation (PWM) switch to be toggled, system Maximum Power Point Tracking (MPPT) according to the maximum power reference current, so as to control the fan to operate stably at the maximum power point.