Fan Control System Noise Reduction via Switch Circuit
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Solution Overview
Problem
Conventional fan control systems generate excessive noise during the initial operation state due to high voltage nominal power driving fans at extremely high rotation speeds, necessitating a transition to lower speeds to reduce noise.
Innovation Solution
A fan control system that reduces nominal power to control power and uses a switch control circuit to manage the power control signal, ensuring the fan operates at a lower rotation speed from the outset, preventing sudden high-speed noise peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If nominal power in high voltage of 12V is supplied to drive the fan during initial operation state, then the fan operates in higher rotation speed to provide adequate cooling, but the fan generates more noise
Solution Approach 1:
The patent introduces a preliminary action by inserting a switch control circuit between the power source and fan circuit module before the fan operates. This circuit pre-processes the power signal during the initial operation state, converting nominal power to control power before it reaches the fan, thereby preventing high-speed operation and noise generation from the outset rather than requiring a subsequent transition.
Solution Approach 2:
The switch control circuit serves as an intermediary component that mediates between the power source and the fan circuit module. It receives the power control signal, controls the switch element to adjust the duty cycle, and outputs controlled power to the fan, thereby enabling smooth transition from initial to steady operation state without direct high-voltage connection.
2Speed
If nominal power directly drives the fan during initial operation state, then the fan starts immediately, but it operates at extremely high rotation speed causing louder noise
Solution Approach 1:
The switch control circuit performs preliminary action by pre-controlling the power delivery to the fan during the initial operation state. Through the power control signal and duty cycle adjustment, it ensures the fan operates at appropriate speed from startup, preventing the extremely high rotation speed that would generate loud noise.
Solution Approach 2:
The patent applies dynamics by making the fan's operating speed adjustable and time-dependent. The switch control circuit dynamically adjusts the duty cycle based on the operation state (initial vs. steady), allowing the fan speed to adapt smoothly to different operational requirements rather than operating at fixed high speed.
3Object-generated harmful factors
If the system uses a steady-time period to transition the fan to lower rotation speed, then noise is reduced, but the system requires additional transition time
Solution Approach 1:
The switch control circuit implements preliminary action by establishing proper power control from the very beginning of operation. The power control signal is generated immediately during the initial operation state, so the fan never experiences uncontrolled high-speed operation. This eliminates the need for a subsequent steady-time transition period, reducing the time loss while maintaining noise reduction.
4Power
If the power supply sends nominal power in high voltage, then the fan can operate at high rotation speed for adequate cooling, but it generates excessive noise during initial operation
Solution Approach 1:
The switch control circuit acts as an intermediary that receives nominal power from the power source and transforms it into controlled power for the fan. By using the power control signal to adjust the switch element's duty cycle, it delivers appropriate power levels during the initial operation state, enabling adequate cooling while preventing excessive noise generation.
Solution Approach 2:
The patent applies parameter changes by modifying the power delivery parameters through the switch control circuit. The duty cycle of the switch element is adjusted based on the operation state, changing the effective power and voltage delivered to the fan. This allows the system to maintain adequate cooling power while controlling the noise-generating rotation speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces noise generated by fans during initial operation by maintaining lower rotation speeds and allowing continuous power control, preventing sudden high-speed noise spikes.
Implementation Method 1
a switch control circuit (32), wherein the switch control circuit (32) reduces the nominal power to a control power
Data Source
AI summary
A fan control system includes a power source, a switch control circuit, a switch control signal delivering unit and a fan circuit module. The power source outputs a nominal power, the switch control circuit electrically connects to the power source, the switch control signal delivering unit electrically connects to the switch control circuit and can send a power control signal to the switch control circuit, and the fan circuit module electrically connects to the switch control circuits. In an initial operation state, the nominal power output from the power source can be reduced to a control power sending to the fan circuit module via the switch control circuit to drive at least one fan within the fan circuit module, and then the power control signal controls the control power after the switch control signal delivering unit sends the power control signal to the switch control circuit.