Multi-Segment Switch Fan Motor Speed Control
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Solution Overview
Problem
Conventional fan motor control systems face inaccuracies in controlling rotating speed due to distorted or delayed voltage signals resulting from pulse-width modulation (PWM) signal conversion, which fails to accurately match the fan motor's speed with heat dissipation needs.
Innovation Solution
A multi-speed control apparatus utilizing a multi-segment switch to create multiple input voltages, connected to a resistor circuit and a voltage-division resistor, which drives the fan motor to specific rotating speeds by comparing input voltages with oscillation signals, thereby isolating the control from environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a converter is used to convert PWM signal into voltage signal, then the controller can read the signal, but the voltage signal becomes distorted or delayed
Solution Approach 1:
The patent extracts the voltage signal generation function from the converter and implements it directly within the controller using a multi-segment switch and resistor circuit. This eliminates the external converter that causes signal distortion and delay, while maintaining the ability to generate multiple voltage levels for PWM control.
2Adaptability or versatility
If the controller changes rotating speed based on PWM signal, then the fan motor can adapt to temperature changes, but the control accuracy decreases
Solution Approach 1:
The patent segments the voltage signal generation into multiple discrete levels using a multi-segment switch with several switching elements. Each segment corresponds to a specific voltage level, allowing precise control of the fan motor speed across different temperature conditions. This segmented approach provides accurate, discrete speed steps rather than continuous or imprecise control.
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
The solution allows for precise control of fan motor speeds, independent of environmental conditions, by generating driving signals with varying duty cycles based on segmented input voltages, ensuring accurate heat dissipation and motor operation.
Implementation Method 1
the multi-segment switch is preferably connected to the resistor circuit, the voltage-division resistor, the controlled end of the driving member, and a voltage source. The multi-segment switch is optionally connected to any resistor element across the voltage source and a voltage-division resistor. An input voltage may then be created across the resistor element by dividing voltage.
Data Source
AI summary
Disclosed is a multi-speed control apparatus for a fan motor. The apparatus includes a driving member, a motor speed sensing member, a resistor circuit, a voltage-division resistor, and a multi-segment switch. The driving member has a controlled end connected with the multi-segment switch. The driving member has an output end connected with the fan motor. The driving member has a detection end connected with the motor speed sensing member. The resistor circuit includes some resistors with various resistances. The multi-segment switch interconnects the resistor circuit, the voltage-division resistor, the controlled end of the driving member, and a voltage source. This switch is optionally connected to the resistor disposed in the voltage source or voltage-division resistor. An input voltage is created across the resistor by dividing the voltage. The driving member is therefore provided for driving the fan motor to a rotating speed according to the input voltage.