Universal Fan Drive Apparatus for 3-Pin and 4-Pin Speed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional computer systems are unable to accurately identify and control the speed of both 3-pin and 4-pin fans, leading to unstable speed control and potential overheating of system components due to differences in power supply mechanisms.
Innovation Solution
A universal driving apparatus that includes a receptacle, power switch, integrator, and comparator to differentiate between 3-pin and 4-pin fans by integrating speed signals and comparing them with a comparative voltage, allowing the system to adjust power and speed control signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PWM signal is input to the power contact of 3-pin fan to control speed, then speed control is achieved, but the power switch turns OFF during non-100% duty cycle periods causing unstable operation and incorrect speed signals
Solution Approach 1:
The patent introduces an integrator circuit as an intermediary between the speed detection contact and the comparator. This integrator accumulates the speed signals over time and converts them into a stable comparative voltage, mediating the unstable intermittent signals from 3-pin fans into reliable data for fan type identification and speed control.
Solution Approach 2:
The patent replaces the mechanical/physical direct reading of speed signals with an electronic integration and comparison system. Instead of directly measuring instantaneous speed signals that fluctuate with PWM duty cycle, the system uses electronic integration to accumulate signals over time, substituting physical measurement with electronic processing to achieve stable identification.
2Reliability
If separate control circuits are used for 3-pin and 4-pin fans, then each fan type can be controlled accurately, but the system cannot identify and drive both fan types universally
Solution Approach 1:
The patent creates a universal fan control system that can identify and control both 3-pin and 4-pin fans through a single apparatus. The integrator-comparator circuit serves multiple functions: it integrates speed signals from either fan type, compares the integrated voltage against reference values, and identifies the fan type accordingly, enabling one system to handle multiple fan configurations.
Solution Approach 2:
The patent uses parameter changes in the integrated voltage to distinguish between fan types. By monitoring the magnitude and characteristics of the integrated voltage from speed signals, the system detects parameter differences that indicate whether a 3-pin or 4-pin fan is connected, allowing adaptive control based on the detected fan type.
3Measurement precision
If the integrator integrates speed signals to identify fan type, then accurate fan type identification is achieved, but the system complexity increases with additional circuit components
Solution Approach 1:
The patent merges the speed signal processing and fan type identification functions into a single integrated circuit path. The integrator and comparator are combined in sequence to form a unified identification mechanism, and this same path is used for both 3-pin and 4-pin fan detection, consolidating multiple functions into a streamlined circuit rather than separate identification systems.
Data Source
AI summary
A universal driving apparatus of a computer system, including a receptacle, a power switch, an integrator and a comparator, is provided to identify and drive a first fan and a second fan. The receptacle connects to the first fan or the second fan for electricity supply and system control. The integrator integrates speed signals of the first fan and the second fan to output an integrated-speed voltage. The comparator compares the integrated-speed voltage and a comparative voltage to output a comparative signal. Accordingly, the computer system uses the comparative signal to identify the fan type and actuate the first fan or the second fan correctly.