DC Power Supply Bent Air Passage Cooling
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Solution Overview
Problem
DC power supply devices for power tools face challenges in efficiently cooling heat-generating elements like smoothing, rectification, and transformation circuits due to their compact design, which requires effective cooling solutions to maintain performance.
Innovation Solution
The DC power supply device incorporates a housing with strategically positioned air passages and a fan to create a longer air flow path, ensuring efficient cooling of circuit elements by directing airflow through bent passages, increasing the surface area exposed to airflow, and utilizing radiator plates for enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing is designed with a compact layout to reduce device size, then the device becomes more portable and space-efficient, but the cooling efficiency of heat-generating circuit elements deteriorates due to insufficient airflow path length
Solution Approach 1:
The air passage is configured with a bent shape instead of a straight line, increasing the airflow path length within the compact housing. The regulation wall portion creates a bent air passage that allows air to flow through a longer route, enhancing cooling efficiency without increasing the external dimensions of the device.
Solution Approach 2:
The air passage extends in multiple directions within the housing rather than following a simple linear path. By utilizing three-dimensional space effectively, the airflow path is lengthened through vertical and horizontal components, allowing adequate cooling while maintaining a compact overall device volume.
2Temperature
If the air passage length is increased to improve cooling efficiency, then heat dissipation from circuit elements is enhanced, but the device size and internal space requirements increase
Solution Approach 1:
The bent air passage configuration allows the airflow to traverse a longer distance within the same housing volume by utilizing curved and angled paths rather than straight lines. This effectively increases the cooling path length without proportionally increasing the housing dimensions.
Solution Approach 2:
The regulation wall portion is integrated within the existing housing structure, and the air passage is formed by utilizing the space between the regulation wall and housing walls. This nested arrangement allows the air passage to be embedded within the housing without adding external volume.
3Temperature
If circuit elements are positioned to maximize airflow exposure for cooling, then cooling efficiency improves, but the layout complexity and device design complexity increase
Solution Approach 1:
The housing internal space is divided into distinct regions: a first air passage region and a second air passage region, with circuit elements strategically positioned in each. The rectification circuit is placed in the first air passage while the transformation circuit is placed in the second air passage, allowing systematic cooling of different functional blocks.
Solution Approach 2:
Different circuit elements are positioned in different locations within the housing to optimize their individual cooling. The rectification circuit and transformation circuit are placed in separate air passage regions, allowing each to receive adequate airflow according to its specific heat generation characteristics.
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
This configuration allows for uniform airflow distribution within the housing, effectively cooling the heat-generating circuit elements and maintaining the compact size of the device while ensuring efficient heat dissipation.
Implementation Method 1
a fan configured to generate an air-flow flowing between the first air passage and the second air passage through the bent air passage
Implementation Method 2
a rectification circuit configured to rectify the alternating current and a transformation circuit configured to transform voltage output from the rectification circuit and convert the alternating current to direct current
Implementation Method 3
heat generating elements such as a smoothing circuit, a rectification circuit, and a transformation circuit
Data Source
AI summary
A DC power supply device includes a housing including a wall portion, a first opening and a second opening, a circuit portion, a regulation wall portion, and a fan. The first and second openings are formed in the wall portion. The circuit portion includes first and second circuit elements those fixed within the housing. The regulation wall portion provide a first air passage in communication with the first opening, a second air passage in communication with the second opening, and a bent air passage allowing the first air passage and the second air passage to communicate with each other. The fan is configured to generate an air-flow flowing between the first air passage and the second air passage. The fan is positioned to face the first opening. The first circuit element is positioned in the first air passage. The second circuit element is positioned in the second air passage.