Multistage Fan Speed Control Curve for Noise Reduction
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Solution Overview
Problem
The rapid increase in processor temperature due to increased computation leads to sudden and rapid fan rotation, resulting in excessive noise, as existing fan control systems do not effectively manage temperature and noise levels dynamically.
Innovation Solution
A multistage function curve is established to associate processor temperatures with fan rotation speeds, allowing for dynamic adjustment of fan speed based on detected temperatures, incorporating steady-state and varying slope segments to manage noise levels within a comfortable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotation speed is rapidly increased to maximum value from preset rotation speed when processor temperature rises suddenly, then the processor temperature can be effectively reduced, but the noise generated by the fan increases rapidly and bothers users
Solution Approach 1:
The patent applies dynamics by implementing a multistage function curve that dynamically adjusts fan rotation speed based on temperature changes. Instead of a fixed or single-stage control, the system transitions through multiple rotation speed stages (first, second, third, and fourth stages) with varying slopes, allowing the fan speed to adapt dynamically to different temperature conditions while controlling noise impact
Solution Approach 2:
The patent changes the parameter of fan rotation speed control by introducing a multistage function curve with different slope characteristics for each stage. The curve divides temperature ranges into multiple stages, each with specific slope values that determine how rapidly fan speed increases. This parameter change approach allows the system to balance cooling effectiveness with noise control by adjusting the rate of speed increase across different temperature thresholds
2Device complexity
If a simple single-stage fan control is used, then the control circuit is simple, but it cannot effectively manage both temperature reduction and noise control simultaneously
Solution Approach 1:
The patent applies segmentation by dividing the fan control function into multiple discrete stages (first, second, third, and fourth stages) with distinct slope characteristics. Each stage corresponds to a specific temperature range and rotation speed adjustment rate. This segmentation allows the system to achieve sophisticated noise-temperature management without requiring overly complex control logic, as each stage can be independently defined and implemented
Data Source
AI summary
The disclosure relates to a method, circuit, and electronic device for controlling a rotation speed of a fan. The method provides a multistage function curve associates temperatures with rotation speed values. The multistage function curve comprises a first steady-state function segment with slope of zero, a second steady-state function segment with slope of zero and N function segments positioned between the first and second steady-state function segments. N is a positive integer. The slope of a (i+1)th function segment is greater than that of an ith function segment, and i is a positive integer in the range from 1 to N. The electronic device comprising the circuit may use the temperature of the processor based on the multistage function curve to dynamically control the rotation speed.