Light source device
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Solution Overview
Problem
Conventional ultraviolet ray irradiating devices with multiple LED elements face heat dissipation issues, leading to reduced lighting efficiency and LED life, and increased risk of dust inhalation and fan breakdown due to inefficient fan control.
Innovation Solution
A light source device with a cooling fan that adjusts its revolutions based on the light source's on/off state and quantity of light, reducing revolutions when the light source is turned off to prevent heat buildup and dust inhalation, and using a temperature sensor for further control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan device rotates at maximum speed when the LED element is turned on, then heat dissipation is improved, but dust inhalation risk and fan breakdown risk increase
Solution Approach 1:
The fan control unit dynamically adjusts the fan device's rotation speed based on the LED element's operational state. When the LED element is turned on, the fan rotates at maximum speed for effective heat dissipation. When the LED element is turned off, the fan rotates at reduced speed to minimize dust inhalation and extend fan life, while still maintaining sufficient cooling to prevent heat buildup in the housing.
2Use of energy by moving object
If the fan device stops when the LED element is turned off, then energy consumption is reduced, but heat buildup in housing occurs
Solution Approach 1:
Instead of completely stopping the fan device when the LED element is turned off, the control unit maintains partial operation by rotating the fan at reduced speed. This partial action is sufficient to prevent heat buildup in the housing while consuming significantly less energy than continuous maximum-speed operation, thus resolving the contradiction between energy savings and heat dissipation.
3Illumination intensity
If multiple LED elements are mounted to increase ultraviolet light output, then lighting efficiency is improved, but heat generation and heat dissipation difficulty increase
Solution Approach 1:
The control unit is configured to start the fan device before turning on the LED elements and to continue rotating the fan at reduced speed after turning off the LED elements. This preliminary and extended fan operation prepares the cooling system in advance and maintains cooling capacity throughout the LED operation cycle, effectively managing the heat generated by multiple LED elements while maintaining high ultraviolet light output.
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 solution effectively prevents heat buildup in the housing, reduces the risk of dust inhalation and fan breakdown, and prolongs the life of the cooling fan by continuously rotating the fan at a lower speed when the light source is off.
Implementation Method 1
a cooling fan for cooling the light source
Implementation Method 2
a plurality of ultraviolet LED elements as a light source
Data Source
AI summary
Provided is a light source device in which the housing is not full of heat, and the risk of inhaling dust in the housing or the risk of reduction of life of the fan device becomes reduced. In an aspect, a light source device according to the present disclosure includes a light source; a light source control unit for controlling turning on/off and a quantity of light of the light source; a cooling fan for cooling the light source; and a fan control unit for controlling a number of revolutions of the cooling fan, wherein the fan control unit is configured to: control the number of revolutions of the cooling fan to become a first number of revolutions depending on the quantity of light of the light source when the light source is turned on, and control the number of revolutions of the cooling fan to become a second number of revolutions lower than the first number of revolutions by waiting for a predetermined waiting time when the light source is turned off.