Phosphor Wheel Speed Control for Noise and Cooling Balance
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Solution Overview
Problem
Existing projection display devices face challenges in appropriately controlling the rotational speed of phosphor wheels, which affects cooling efficiency and noise levels due to variations in atmospheric pressure.
Innovation Solution
A control device equipped with an atmospheric pressure sensor and a controller that adjusts the rotational speed of the phosphor wheel based on atmospheric pressure information, using pre-defined tables to determine settable speed ranges and threshold temperatures to maintain optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the rotational speed of the phosphor wheel is reduced to lower noise levels, then noise is reduced, but cooling efficiency deteriorates
Solution Approach 1:
The patent implements dynamic rotational speed control of the phosphor wheel based on real-time atmospheric pressure detection. The control unit adjusts the rotational speed according to atmospheric pressure conditions, enabling the system to adaptively balance noise reduction and cooling efficiency rather than operating at a fixed speed. This resolves the contradiction by making the rotational speed a dynamic parameter that responds to environmental conditions.
Solution Approach 2:
The patent changes the operational parameters (rotational speed) based on atmospheric pressure variations. By detecting atmospheric pressure and adjusting the rotational speed accordingly, the system optimizes the balance between noise generation and cooling performance. The control unit modifies the rotational speed parameter to maintain appropriate cooling efficiency while minimizing noise under different atmospheric conditions.
2Reliability
If the rotational speed of the phosphor wheel is increased to improve cooling efficiency, then cooling efficiency is improved, but noise increases
Solution Approach 1:
The system dynamically adjusts rotational speed based on atmospheric pressure conditions rather than maintaining a constant high speed. The control unit responds to atmospheric pressure changes by optimizing the rotational speed, ensuring adequate cooling while minimizing noise generation. This dynamic approach resolves the contradiction by preventing unnecessarily high rotational speeds that would generate excessive noise.
Solution Approach 2:
The patent modifies the rotational speed parameter according to atmospheric pressure measurements. By changing the operational parameter (rotational speed) based on environmental conditions, the system achieves optimal cooling efficiency without consistently operating at noise-generating high speeds. The control unit adjusts the speed parameter to maintain the necessary cooling performance while reducing noise under favorable atmospheric conditions.
3Device complexity
If fixed rotational speed control is used to simplify the control system, then device complexity is reduced, but adaptability to atmospheric pressure changes deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the control unit receives atmospheric pressure information from the detection unit and adjusts the rotational speed of the phosphor wheel accordingly. This closed-loop feedback system enables the device to automatically adapt to atmospheric pressure changes without requiring complex manual intervention or reconfiguration, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The control system performs self-adjustment based on atmospheric pressure conditions without external intervention. The control unit autonomously modifies the rotational speed in response to atmospheric pressure changes detected by the detection unit, enabling the system to self-optimize its performance. This self-service capability provides adaptability to environmental changes while maintaining relatively simple system architecture.
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 suppresses decreases in cooling efficiency and reduces noise by appropriately controlling the rotational speed of the phosphor wheel in response to changing atmospheric pressures, enhancing the reliability and performance of the device.
Implementation Method 1
atmospheric pressure sensor that acquires atmospheric pressure information indicating an atmospheric pressure around the phosphor wheel
Implementation Method 2
a rotating body on which a layer of a phosphor that emits light in response to light emitted from the light source
Data Source
AI summary
A control device according to the present disclosure is a control device for controlling a rotational speed of a phosphor wheel. The device includes an atmospheric pressure sensor that acquires atmospheric pressure information indicating an atmospheric pressure around the phosphor wheel, and a controller that controls the rotational speed of the phosphor wheel based on the atmospheric pressure information.