Fan Control Circuit Weighted Temperature Synthesis
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Solution Overview
Problem
Current fan control circuits in electronic devices face challenges in accurately adjusting fan rotation speeds based on the operating temperatures of multiple heat elements, such as control chips, transformers, and switch elements, which can lead to inefficient heat dissipation and energy consumption.
Innovation Solution
A fan control circuit comprising temperature detection units, a temperature synthesizing unit, and a driving signal generation unit that calculates mean temperature signals using weighted values and generates PWM signals to adjust the fan's rotation speed, optimizing heat dissipation while reducing energy consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fan control circuit adjusts rotation speed based on operating temperature, then heat dissipation efficiency is improved, but the complexity of temperature monitoring and control increases
Solution Approach 1:
The patent changes the control parameter from simple on/off switching to PWM duty cycle adjustment based on temperature. The control circuit monitors temperature and dynamically adjusts the PWM duty cycle to optimize fan operation, improving heat dissipation efficiency while maintaining manageable circuit complexity through parameter-based control.
Solution Approach 2:
The patent implements a feedback mechanism where the control circuit continuously monitors the operating temperature and adjusts fan rotation speed accordingly. This closed-loop control ensures optimal heat dissipation while avoiding excessive complexity by using temperature as the direct feedback parameter.
2Temperature
If fan rotation speed is increased to improve heat dissipation, then cooling performance is improved, but energy consumption and noise increase
Solution Approach 1:
The patent applies dynamic control by adjusting fan rotation speed according to real-time temperature conditions rather than maintaining a constant high speed. The PWM controller dynamically modifies the duty cycle to match cooling demands, improving cooling performance only when necessary while reducing energy consumption during lower thermal loads.
Solution Approach 2:
The patent changes the operational parameter of the fan from fixed speed to variable speed control. By adjusting the PWM duty cycle parameter, the system optimizes the balance between cooling performance and energy consumption, activating full cooling only when temperature thresholds are exceeded.
3Temperature
If fan rotation speed is increased to improve heat dissipation, then cooling performance is improved, but noise levels increase
Solution Approach 1:
The patent implements dynamic speed adjustment where the fan operates at variable speeds based on thermal conditions. By using PWM control to dynamically adjust rotation speed, the system provides adequate cooling performance while minimizing noise during periods of lower thermal demand.
Solution Approach 2:
The patent uses PWM (pulse width modulation) which inherently employs periodic action to control fan speed. The periodic switching of the PWM signal allows precise control of average power delivery to the fan, enabling cooling performance optimization while reducing noise through controlled duty cycles rather than continuous high-speed operation.
Data Source
AI summary
A fan control circuit drives and adjusts a rotation speed of a fan according to operating temperatures of a plurality of heat elements. The fan control circuit includes a plurality of temperature detection units, a temperature synthesizing unit, and a driving signal generation unit. Each of the temperature detection units respectively detects the operation temperature of each of the heat elements and outputs a temperature detection signal corresponding to each of the heat elements. The temperature synthesizing unit calculates and outputs mean temperature signals according to the plurality of temperature detection signals and a plurality of predetermined weighted values corresponding to the heat elements. The driving signal generation unit generates driving signals to the fan according to the mean temperature signals.