Fan Driving Circuit Bidirectional Rotation Control
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Solution Overview
Problem
Conventional fan driving circuits are limited to unidirectional rotation, failing to accommodate bidirectional rotation requirements.
Innovation Solution
A fan driving circuit comprising a primary winding, an activating capacitor, a control circuit, and a switch circuit that controls the direction of the secondary winding's driving current based on a control signal's voltage level, allowing the fan to rotate bidirectionally by altering the current flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fan driving circuit is used, then the fan rotates unidirectionally in a fixed manner, but it cannot accommodate bidirectional rotation requirements
Solution Approach 1:
The patent applies dynamics by making the circuit configuration changeable through a switching circuit that can dynamically alter the connection topology of the oscillating circuit based on control signals, enabling bidirectional rotation capability while maintaining a relatively simple base circuit structure
Solution Approach 2:
The patent implements multi-functionality by designing the switching circuit to control the connection relationship between components, allowing the same circuit to achieve both unidirectional and bidirectional rotation functions depending on the control signal state
2Adaptability or versatility
If the switch circuit controls current direction based on control signal voltage level, then bidirectional rotation is enabled, but the device complexity increases
Solution Approach 1:
The patent uses the control signal as an intermediary element that mediates between the control input and the switching circuit, enabling direction control through voltage level detection without requiring complex control logic or additional control components
Solution Approach 2:
The patent changes the electrical parameter (voltage level) of the control signal to control the switching state, which in turn changes the current flow direction through the oscillating circuit, achieving bidirectional control through simple parameter variation rather than complex structural changes
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
Enables bidirectional rotation of the fan by controlling the current flow direction through the secondary winding, overcoming the unidirectional limitations of conventional fan driving circuits.
Implementation Method 1
The secondary winding electromagnetically drives a fan according to a flowing direction of its driving current
Data Source
AI summary
A fan driving circuit includes a primary winding, an activating capacitor, a control circuit, a switch circuit and a secondary winding. The primary winding and the activating capacitor are electrically coupled to an external power source. The control circuit generates a control signal. The switch circuit is electrically coupled to the first winding. The switch circuit is also electrically coupled to the activating capacitor. The switch circuit has at least one control terminal electrically coupled to the control circuit for receiving the control signal. The secondary winding is electrically coupled to the switch circuit. The secondary winding is electrically coupled to the switch circuit. The secondary winding electromagnetically drives a fan according to a flowing direction of its driving current. The switch circuit conducts the secondary winding's driving current's flowing direction based on the control signal's voltage level.