Projector TEC Temperature Control to Prevent Condensation
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Solution Overview
Problem
Condensation occurs on the thermoelectric cooler (TEC) in projectors due to temperature drops below the dew point during low brightness conditions, leading to potential malfunction or damage.
Innovation Solution
A temperature control module with a thermal sensor, cooling device, and control circuit that adjusts fan rotation speed and TEC cold side temperature based on ambient temperature and brightness settings to prevent condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the TEC driving current and fan rotation speed under high brightness conditions are used to cool the hot side of the TEC during low brightness conditions, then the heat dissipation effect is maintained, but the cold side temperature drops below the dew point and condensation occurs
Solution Approach 1:
The patent implements dynamic adjustment of TEC driving current and fan rotation speed based on real-time brightness level detection. The control circuit continuously monitors the brightness level and adjusts the cooling parameters accordingly, transitioning from static fixed-speed operation to dynamic variable-speed operation that adapts to changing operational conditions, thereby preventing condensation while maintaining effective heat dissipation.
Solution Approach 2:
The patent introduces a feedback mechanism where the control circuit receives brightness level information and uses it to adjust the TEC driving current and fan rotation speed. This closed-loop control ensures that the cooling system responds to actual operational conditions, reducing cooling intensity when brightness is low to prevent condensation while maintaining sufficient cooling when brightness is high.
2Use of energy by moving object
If the fan rotation speed is reduced during low brightness conditions to save energy and reduce noise, then energy consumption and noise are reduced, but the hot side temperature of TEC may not be cooled sufficiently
Solution Approach 1:
The patent implements dynamic adjustment of fan rotation speed based on real-time brightness level detection. The control circuit continuously monitors the brightness level and adjusts the fan speed accordingly, transitioning from static fixed-speed operation to dynamic variable-speed operation that adapts to changing operational conditions, thereby reducing energy consumption and noise during low brightness conditions while maintaining sufficient cooling when needed.
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
Prevents condensation on the TEC, thereby safeguarding the projector from malfunction or damage by dynamically regulating temperature based on environmental conditions.
Implementation Method 1
a thermal sensor, a cooling device, and a control circuit. The thermal sensor is disposed on the projector, and the thermal sensor is suitable for sensing the ambient temperature to generate an ambient temperature sensing signal
Implementation Method 2
the hot side is cooled directly through the air flow generated by the fan
Implementation Method 3
by connecting a heat dissipation device (such as a heatsink) and then cooling the heat dissipation device through the air flow generated by the fan
Implementation Method 4
If a thermoelectric cooler (TEC) is used in the projector, since the TEC contains opposite sides of a hot side and a cold side, the cold side is in contact with the heat source, and the hot side is cooled directly through the air flow generated by the fan
Data Source
AI summary
A temperature control module and a temperature control method, which are suitable for a projector. A thermal sensor is disposed on the projector and suitable for sensing the ambient temperature to generate an ambient temperature sensing signal. A cooling device is disposed on the projector and suitable for cooling a target element of the projector. When the projector is in a brightness adjustment mode, a control circuit generates a control signal to the cooling device according to the ambient temperature sensing signal from the thermal sensor and the brightness setting signal of the projector. The cooling device adjusts the temperature regulation operation performed on the target element according to the control signal.