Projector Heat Dissipation Control Using Dual Vent Temperature Feedback

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Solution Overview

Problem

Existing projector heat dissipation methods fail to effectively respond to heat accumulation due to partial-blockage of the outlet vent, leading to increased body temperatures and potential damage to internal devices, as they rely solely on intake vent temperature measurements for fan control.

Innovation Solution

A heat dissipation method that measures both intake and outlet vent temperatures, adjusting fan control based on outlet vent temperatures to enhance heat dissipation when blockage is detected, and includes a logic device to manage fan operation and potentially trigger shutdown to prevent damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If fan control is based solely on intake vent temperature measurements, then the control mechanism is simple, but the heat dissipation effectiveness deteriorates when outlet vent is partially blocked

Engineering Contradiction:

Improvecontrol mechanism complexityVSAvoidheat dissipation effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements feedback control by measuring temperatures at both the intake vent (first temperature) and outlet vent (second temperature), then using these measurements to dynamically adjust fan rotational speed. The control mechanism compares the second temperature against a threshold and adjusts fan speed accordingly, creating a closed-loop feedback system that responds to actual heat accumulation conditions rather than relying on simple intake temperature alone.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent transitions from one-dimensional temperature monitoring (intake vent only) to two-dimensional temperature monitoring by adding outlet vent temperature measurement. This dimensional expansion allows the system to detect heat accumulation patterns that indicate partial blockage, enabling more reliable heat dissipation control without excessive complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If fan rotational speed is increased to compensate for partial blockage, then heat dissipation effectiveness improves, but energy consumption increases

Engineering Contradiction:

Improveheat dissipation effectivenessVSAvoidfan energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamic control by continuously monitoring the second temperature at the outlet vent and adjusting fan rotational speed in real-time based on detected conditions. When partial blockage is detected (second temperature exceeds threshold), the system dynamically increases fan speed to compensate. When no blockage is present, the system maintains lower fan speed, optimizing energy consumption while ensuring heat dissipation effectiveness when needed.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the projector shuts down when outlet vent temperature exceeds threshold, then device protection is ensured, but operational continuity deteriorates

Engineering Contradiction:

Improvedevice protectionVSAvoidoperational continuity

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent applies partial action by implementing a staged response rather than immediate shutdown. When the second temperature exceeds the threshold indicating partial blockage, the system first increases fan rotational speed to compensate for reduced heat dissipation. Only if the temperature continues to rise despite increased fan speed does the system proceed to shutdown. This partial action approach maintains operational continuity whenever possible while ensuring device protection when necessary.

Inventive Principle:

Principle #16Partial or excessive action

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 approach allows for timely and effective heat dissipation in response to varying degrees of blockage, reducing the risk of internal device damage by using outlet vent temperature measurements to adjust fan speed and potentially shutting down the projector to prevent overheating.

Implementation Method 1

measuring a first temperature at the intake vent

Methodology Applied

Scientific EffectTemperature measurement:

Implementation Method 2

measuring a second temperature at the outlet vent

Methodology Applied

Scientific EffectTemperature measurement:

Implementation Method 3

a heat sink for lowering a temperature of the projector

Methodology Applied

Scientific EffectHeat dissipation:

Data Source

PatentUS7728282B2Method and apparatus capable of controlling heat dissipation based on temperatures measured at an intake vent and an outlet vent

Publication Date: 2010.06.01 QISDA CORP

AI summary

A heat dissipation method for a projector includes measuring a first temperature at an intake vent of a projector, measuring a second temperature at an outlet vent of the projector, controlling a heat sink of the projector based on the first temperature when the second temperature is smaller than a predetermined value, and controlling the heat sink of the projector based on the second temperature when the second temperature is larger than the predetermined value.