Fan Motor Control Circuit Using Dual Threshold Voltage Segmentation
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Solution Overview
Problem
Conventional fan systems require expensive multi-function chips to adjust fan rotation speed based on temperature, increasing the overall cost and limiting their application fields.
Innovation Solution
A driving control device with a temperature sensing circuit, comparing circuit, and rotation speed control circuit that uses threshold values to generate driving signals for the motor, eliminating the need for complex chips by implementing two stages of rotation speeds through a simple design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a multi-function chip is used to adjust fan rotation speed based on temperature, then the fan control function is improved, but the manufacturing cost increases
Solution Approach 1:
The patent divides the fan control system into separate functional modules: a temperature sensing circuit for detecting temperature, a rotating speed control circuit for processing control signals, and a driving circuit for driving the fan motor. This segmentation eliminates the need for an expensive multi-function chip while achieving the same control functionality through simpler, dedicated circuits.
Solution Approach 2:
The rotating speed control circuit is designed to be universally applicable by accepting various types of control signals (analog voltages or digital signals) and converting them into appropriate driving signals for the fan motor. This universal design allows the same circuit to handle different temperature conditions and control requirements without needing specialized chips.
2Measurement precision
If a multi-function chip is used for temperature-based fan control, then the control precision is improved, but the device complexity increases
Solution Approach 1:
The patent separates the temperature sensing function from the control logic function. The temperature sensing circuit independently detects temperature and generates control signals, while the rotating speed control circuit independently processes these signals. This segmentation maintains measurement precision while reducing overall device complexity by using simple, dedicated circuits instead of a complex integrated chip.
3Device complexity
If threshold values are used for rotation speed control, then the device complexity is reduced, but the control adaptability decreases
Solution Approach 1:
The rotating speed control circuit is designed to dynamically respond to different control signals by comparing input voltages with reference voltages. This dynamic comparison mechanism allows the circuit to adaptively adjust the fan rotation speed across a wide range while maintaining relatively simple circuit implementation, thus preserving adaptability while reducing complexity.
Data Source
AI summary
A driving control device of a motor includes a temperature sensing circuit, a comparing circuit, a rotation speed control circuit and a driving circuit. The temperature sensing circuit detects an environmental temperature for generating a sensing signal. The comparing circuit is electrically connected to the temperature sensing circuit, and compares the sensing signal with a reference voltage signal for outputting a comparing signal. The rotation speed control circuit is electrically connected to the comparing circuit and has a first threshold voltage and a second threshold voltage, both of which are compared with the comparing signal for outputting a rotation speed control signal. The driving circuit is electrically connected to the rotation speed control circuit, and generates a driving signal to drive the motor in accordance with the rotation speed control signal.