Fan Control Circuit with Temperature Compensation
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Solution Overview
Problem
Existing fan control systems rely on temperature detection, leading to delays in increasing fan speed when loading increases, resulting in suboptimal heat dissipation capabilities.
Innovation Solution
A fan control circuit with temperature compensation that adjusts fan speed based on both loading and temperature changes, using an on-off unit and speed adjustment unit to dynamically switch between fixed-speed and speed-adjusting modes, incorporating a temperature compensation mechanism to anticipate and respond to temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fan speed is controlled by detecting temperature, then heat dissipation capability is improved, but response time is delayed
Solution Approach 1:
The patent applies preliminary action by using loading information to predict future temperature changes and advance fan speed adjustments before actual temperature rise occurs. The control method proactively increases fan speed when loading increases, anticipating the temperature increase that will follow, thereby eliminating the lag inherent in reactive temperature-based control.
Solution Approach 2:
The patent uses temperature compensation to perform preliminary adjustment of fan speed based on predicted temperature changes from loading variations. By calculating the temperature change amount from loading data and adjusting fan speed in advance, the system prepares the heat dissipation capability before the actual thermal condition requires it, resolving the response time delay.
2Reliability
If fan speed is increased to improve heat dissipation, then heat dissipation capability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic fan speed control that continuously adapts to changing loading conditions and temperature variations. Rather than maintaining constant high speed, the system dynamically adjusts fan speed to match actual heat dissipation requirements, ensuring optimal performance while minimizing unnecessary energy consumption during low-load periods.
Solution Approach 2:
The patent changes the control parameter from purely temperature-based to a combined loading and temperature-based system. By incorporating loading information as an additional control parameter, the system can predict temperature changes and adjust fan speed more precisely, avoiding both over-cooling (wasting energy) and under-cooling (insufficient heat dissipation).
Data Source
AI summary
A fan control circuit with temperature compensation includes an on-off unit and a speed adjustment unit. When determining that a loading is greater than or equal to an adjustable start threshold according to a load signal, the on-off unit controls the fan entering a working mode. In the working mode and determining that the loading is less than a speed-adjusting threshold, the on-off unit maintains a speed value of the fan at a first fixed speed. When determining the loading is greater than or equal to the speed-adjusting threshold, the speed adjustment unit adjusts the speed value according to the loading. The speed adjustment unit generates a speed displacement according to a temperature signal to compensate the speed value.