Fan Rotation Control Circuit Using Analog Charging-Discharging
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Solution Overview
Problem
Traditional rotation control circuits for fans require expensive microcontrollers to generate forward and backward rotation control signals, leading to a cost disadvantage.
Innovation Solution
A rotation control circuit comprising a motor-driving unit and a rotation-switching unit with a charging-discharging circuit, utilizing only analog components to control the motor's direction without a microcontroller, using a capacitor to generate rotation control commands based on voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microcontroller is used to generate forward and backward rotation control signals, then the fan rotation control function is achieved, but the cost increases
Solution Approach 1:
The patent extracts the control function from a microcontroller and implements it using a dedicated rotation control circuit with specific components (comparator, resistor, capacitor, and motor driving unit). This removes the need for a microcontroller while maintaining the forward/backward rotation control functionality, thereby reducing cost and complexity.
Solution Approach 2:
The patent introduces an intermediary rotation control circuit that mediates between the power supply and the motor driving unit. This circuit uses a capacitor and comparator to generate the appropriate control signals for forward and backward rotation, replacing the microcontroller's intermediary control function with a simpler analog circuit.
2Ease of operation
If a microcontroller is used to control fan rotation, then precise rotation control is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces the expensive microcontroller with inexpensive analog components (comparator, resistor, capacitor) that perform the control function. While these components have simpler functionality, they achieve the necessary control precision for fan rotation without the overhead of a microcontroller, effectively using cheaper components to replace a more complex and expensive one.
3Ease of manufacture
If analog components are used instead of microcontroller, then cost is reduced, but control signal generation capability is simplified
Solution Approach 1:
The patent designs the rotation control circuit to perform multiple functions using a single integrated approach. The capacitor serves both as a timing element and a signal generator, the comparator provides both threshold detection and signal inversion, and the motor driving unit handles both forward and backward rotation control. This multi-functionality compensates for the reduced flexibility of analog components compared to a microcontroller.
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
This solution reduces costs by eliminating the need for microcontrollers while effectively controlling fan rotation for dust exhaustion and heat dissipation, allowing the fan to operate with a few analog components.
Implementation Method 1
a charging-discharging circuit for generating a rotation control command, the rotation control command controls the motor to rotate in a forward direction for a time period when the motor starts to operate
Data Source
AI summary
A rotation control circuit comprises a motor-driving unit and a rotation-switching unit. The motor-driving unit is coupled to a motor of a fan. The rotation-switching unit is coupled to the motor-driving unit and has at least a charging-discharging circuit for generating a rotation control command, the rotation control command controls the motor to rotate in a forward direction for a time period when the motor starts to operate, and controls the motor to rotate in a backward direction opposite to the forward direction.