Motor Control Circuit for Fan Systems
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Solution Overview
Problem
Conventional fan systems are costly and inconvenient to maintain due to redundant components in both the control circuit and fan devices, leading to increased complexity and difficulty in replacing damaged units.
Innovation Solution
A motor control circuit with a power converting unit, control unit, and switch unit integrated into the control circuit, allowing fan devices to share these components, simplifying internal circuits and reducing costs, while packaging the control unit and switch unit in the control circuit for waterproofing and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fan devices include integrated control units and power units, then each fan device can independently control rotating speeds, but the overall system cost increases and device complexity increases
Solution Approach 1:
The patent merges the control unit and power unit from individual fan devices into a separate, shared control circuit. This external control circuit uses a single power processing unit and multiple control units that can respectively control multiple fan devices, eliminating redundant components while maintaining independent control capability for each fan device.
2Adaptability or versatility
If fan devices have many integrated members, then control functionality is enhanced, but replacement convenience deteriorates and maintenance difficulty increases
Solution Approach 1:
The patent segments the fan system into two independent parts: simple fan devices containing only motor, winding, and sensing unit, and a separate control circuit containing all control and power processing units. This segmentation allows fan devices to be easily replaced without dealing with complex control components, while the control circuit can be independently maintained or upgraded.
3Measurement precision
If control circuits and fan devices share similar control members, then control precision can be maintained, but overall system cost increases due to redundant components
Solution Approach 1:
The patent implements universality by designing the external control circuit to serve multiple fan devices simultaneously. The power processing unit and control units are multi-functional components that can respectively control multiple fan devices, eliminating the need for duplicate control members in each fan device while maintaining precise control capability for each individual fan.
Data Source
AI summary
A control circuit is electrically connected to at least one fan device. The fan device has a motor and generates a sensing signal. The control circuit receives a power-source signal and the sensing signal and includes a power converting unit, a control unit and a switch unit. The power converting unit receives the power-source signal and thus respectively outputs a first power-source signal and a second power-source signal according to the power-source signal. The control unit receives the first power-source signal and the sensing signal and thus generates a control signal according to the sensing signal. The switch unit receives the control signal and generates at least one switch signal according to the control signal. The fan device receives the second power-source signal and the switch signal and drives the motor according to the switch signal.