Fan Drive Circuit Segmentation for Heat and Cost Reduction
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Solution Overview
Problem
Conventional fan systems have complex circuits, high manufacturing costs, and low output power due to heat generation and damage issues with integrated circuit-based drive devices.
Innovation Solution
A fan system design with P-type transistors outside and N-type transistors inside the drive device, along with a current-limited resistor and integrated soft-start and protection units, reduces heat and cost while enhancing output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all switches are disposed inside the drive device, then device complexity is reduced, but heat generation increases and reliability decreases
Solution Approach 1:
The switch assembly is segmented into two parts: first and second switches are disposed outside the drive device, while third and fourth switches are disposed inside the drive device. This segmentation allows the drive device to have a relatively simple circuit structure while avoiding excessive heat concentration inside the drive device, thereby improving reliability.
2Reliability
If all switches are disposed outside the drive device, then reliability improves, but device complexity increases and manufacturing cost increases
Solution Approach 1:
Instead of placing all switches outside the drive device, the patent segments the switch arrangement so that two switches are outside and two switches are inside. This reduces the number of external connections and simplifies the overall circuit structure while still preventing excessive heat concentration inside the drive device.
3Device complexity
If switches are disposed inside the drive device, then device complexity is reduced, but heat generation increases
Solution Approach 1:
The switch assembly is divided such that heat-generating switches (first and second switches) are disposed outside the drive device, while other switches (third and fourth switches) are disposed inside. This segmentation distributes heat generation away from the drive device, lowering its operating temperature.
4Device complexity
If integrated circuit drive device is used, then device complexity is reduced, but manufacturing cost increases
Solution Approach 1:
The drive device uses a hybrid approach where some switches are integrated inside and some are external, avoiding the need for a fully integrated complex IC while still simplifying the overall circuit structure. This balanced approach reduces manufacturing costs compared to fully integrated solutions.
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 design simplifies the circuit, lowers operating temperatures, reduces noise, and increases output power, making the fan system more efficient and cost-effective.
Implementation Method 1
current flowing through the coil L is changed, and thus a motor (not shown in FIG. 1) disposed in the fan system 1 and having the coil L is driven
Data Source
AI summary
A fan system comprising a first switch, a second switch, a coil, and a drive device. The drive device comprises a third switch and a fourth switch. The third switch, the fourth switch, the first switch, the second switch and the coil form a bridge connection.