Projector Cooling Fan Speed Control via Temperature Thresholds
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Solution Overview
Problem
Conventional projector cooling fan control technologies fail to efficiently manage noise levels and temperature control, particularly in varying environmental conditions, leading to suboptimal performance and user experience.
Innovation Solution
A processor-controlled cooling fan system that dynamically adjusts revolution speed modes based on temperature thresholds, switching from a high to a low revolution speed mode and vice versa, while also controlling electric current to the light source, ensuring accurate temperature management and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling fan operates in a constant high revolution speed mode to ensure adequate cooling, then temperature control reliability is improved, but driving noise increases and user comfort deteriorates
Solution Approach 1:
The cooling fan operates in multiple revolution speed modes (first mode with constant speed, second mode with variable speed) rather than a single constant high speed mode. The processor dynamically switches between modes based on temperature detection values, allowing the system to maintain reliable cooling when needed while reducing noise during milder conditions.
Solution Approach 2:
The system changes the operational parameters of the cooling fan by switching between different revolution speed modes. In the first mode, the fan maintains a constant revolution speed for reliable cooling, while in the second mode, the revolution speed varies based on temperature conditions, thereby reducing noise when full cooling capacity is not required.
2Measurement precision
If the cooling fan switches modes frequently based on temperature fluctuations, then temperature control precision is improved, but system stability deteriorates due to excessive mode switching
Solution Approach 1:
The processor continuously monitors temperature detection values and uses this feedback to determine when to switch between cooling fan modes. The switching decisions are based on comparing temperature values against threshold criteria, ensuring that mode changes occur only when genuinely necessary for temperature control, thus balancing precision with stability.
Solution Approach 2:
The system establishes predetermined switching criteria (temperature thresholds and mode conditions) in advance. By defining when mode switching should occur based on pre-set conditions rather than reacting to every temperature fluctuation, the system achieves precise temperature control while avoiding excessive or unnecessary mode switching that would destabilize the system.
3Object-generated harmful factors
If the cooling fan operates in variable speed mode to reduce noise, then driving noise is reduced, but temperature control reliability deteriorates in high temperature environments
Solution Approach 1:
The cooling fan dynamically adapts its operation based on environmental conditions. In the second revolution speed mode, the fan operates with variable speed to reduce noise during normal conditions, but automatically switches to the first mode with constant higher speed when temperature detection values indicate high temperature environments, thereby maintaining cooling reliability when needed.
Solution Approach 2:
The system changes the operational parameters of the cooling fan based on temperature conditions. During low-temperature periods, the fan operates in variable speed mode to minimize noise, but when temperature detection values reach thresholds indicating high temperature environments, the system switches to constant high speed mode to ensure adequate cooling and maintain temperature control reliability.
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 solution provides a comfortable user environment by minimizing noise and effectively protecting electronic components through precise temperature control, maintaining optimal performance across different temperature ranges.
Implementation Method 1
a cooling fan... in a case in which the cooling fan is operating in a first revolution speed mode, a control of switching an operation mode of the cooling fan to a second revolution speed mode
Data Source
AI summary
A projector includes a cooling fan, and a processor, and the processor executes, in a case in which the cooling fan is operating in a first revolution speed mode, a control of switching an operation mode of the cooling fan to a second revolution speed mode whose revolution speed is faster than that of the first revolution speed mode in a case in which an obtained temperature detection value reaches a first threshold, and executes, in a case in which the cooling fan is operating in the second revolution speed mode, a control of switching the operation mode of the cooling fan to a revolution speed mode whose revolution speed is slower than that of the second revolution speed mode in a case in which an obtained temperature detection value decreases below a second threshold which differs from the first threshold.