Ventilating Apparatus Circuit Assembly for Motor Stop on Panel Opening
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Solution Overview
Problem
Existing ventilating apparatuses face challenges in safely stopping the operation of a built-in fan motor when the panel is opened, as safety devices increase part count and installation complexity, making it difficult to integrate them effectively.
Innovation Solution
A circuit assembly with a switch that closes when the panel is coupled and opens when separated, a microcomputer to output a notification signal, and an OR gate to stop the motor independently of control signals, ensuring the motor stops and alerts the user of panel separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety device is installed to stop the motor when the panel is opened, then safety is improved, but the number of parts and device complexity increases
Solution Approach 1:
The patent combines the safety device functionality with the existing control circuit by integrating a switch into the circuit assembly. The switch is electrically connected to the control circuit such that when the panel is opened, the switch opens the circuit, automatically stopping the motor without requiring separate safety devices. This merging approach maintains safety while reducing part count and complexity.
2Reliability
If a safety device is installed to stop the motor when the panel is opened, then safety is improved, but installation difficulty increases
Solution Approach 1:
The safety function is merged into the existing control circuit assembly during manufacturing. The switch is pre-integrated into the circuit board or control assembly, eliminating the need for separate installation steps. This approach improves safety while maintaining ease of manufacture and installation.
3Reliability
If the motor is stopped immediately when the panel is opened, then safety is improved, but the control system complexity increases
Solution Approach 1:
The control circuit is designed to automatically respond to panel opening through the switch mechanism. When the panel is opened, the switch opens the circuit, and the motor stops automatically without requiring complex control algorithms or additional processing. The system serves itself by using the physical state of the panel to directly control the motor circuit.
4Loss of information
If a notification signal is output when the panel is opened, then user awareness is improved, but device complexity increases
Solution Approach 1:
The existing notification components (such as display screens or indicators already present in the ventilating apparatus) are utilized to provide feedback to the user when the panel is opened. By making these existing components serve multiple functions (original purpose plus safety notification), the system improves user awareness without adding dedicated notification hardware or increasing overall device complexity.
Data Source
AI summary
A ventilating apparatus includes a panel, a motor, a circuit assembly, and the apparatus stops an operation of the motor and notify a user when the panel is opened independently of a specific driving condition. The circuit assembly includes a switch which is closed when the panel is coupled to a body, and opened when at least a part of the panel is separated from the body, a motor of which an operation is stopped when the switch is opened, and a microcomputer which is connected to the switch and outputs a notification signal in response to the opening of the switch.