Multi-Power Fan Circuit for Outage and Outdoor Operation
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Solution Overview
Problem
Existing electrical fans are inoperable when there is no mains electricity available or when a rechargeable lithium battery is not charged, limiting their use in outdoor settings or during power outages.
Innovation Solution
An electrical fan design that incorporates multiple power supply options, including a USB-C power supply, a dry battery box for 9V dry batteries, and a lithium battery, with a priority sequence for power supply to ensure continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fan uses only mains electricity or a single rechargeable lithium battery, then the structure is simple, but the fan becomes inoperable when no wall socket is available or the battery cannot be recharged
Solution Approach 1:
The fan incorporates multiple power supply interfaces (mains electricity socket, rechargeable lithium battery, and dry battery compartment) within a single device, enabling it to function across diverse environments. The control circuit automatically detects and switches between different power sources, making the fan universally adaptable whether used at home, outdoors, or during power outages.
Solution Approach 2:
The power supply system is divided into independent modules: a mains electricity input circuit, a rechargeable lithium battery circuit, and a dry battery circuit. Each module can operate independently, and the control circuit selectively activates the appropriate module based on availability, allowing the fan to maintain simplicity while providing multiple options.
2Adaptability or versatility
If the fan incorporates multiple power supply options (USB-C, dry batteries, lithium battery), then the adaptability improves, but the device complexity increases
Solution Approach 1:
The control circuit automatically detects which power source is connected and activates the appropriate power supply path without user intervention. The system self-manages the complexity of multiple power sources by implementing automatic detection and switching logic, keeping the user interface simple while providing robust multi-source capability.
Solution Approach 2:
Multiple power supply circuits are merged into a single integrated power management system on the circuit board. The control circuit unifies the management of mains electricity, USB-C charging, and dry battery inputs through a common control architecture, reducing overall system complexity despite the multiple input options.
3Adaptability or versatility
If the fan relies on a rechargeable lithium battery, then portability is improved, but the fan becomes inoperable during power outages when the battery cannot be recharged
Solution Approach 1:
The fan includes a dry battery compartment as a backup power source that can be prepared in advance. When the rechargeable lithium battery is depleted and no charging infrastructure is available, users can immediately insert fresh dry batteries to maintain operation, providing a cushion against complete operational failure during extended power outages or outdoor activities.
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 fan can operate in various environments without reliance on a single power source, expanding its usability and ensuring continued functionality during power outages or outdoor use.
Implementation Method 1
a motor securely fixed in an interior of the housing to generate rotating power
Implementation Method 2
electrical power supplied from the USB-C power supply is first subjected to voltage boosting by means of the boost circuit
Data Source
AI summary
An electrical fan having various supplies of electricity includes: a housing; a motor securely fixed in an interior of the housing to generate rotating power; an impeller located in the interior of the housing and connected to the motor to be driven by the motor to rotate; a circuit board arranged in the interior of the housing and electrically connected with the motor and including a boost circuit; an electricity supply hole arranged on the housing and electrically connected with the circuit board to provide a USB-C power supply that is provided from outside; a dry battery box arranged in the housing and electrically connected with the circuit board to accommodate therein a plurality of dry batteries that provide a 9V dry-battery power supply; and a control switch arranged on the housing to serve as a user control interface.