Overheating prevention apparatus and projection apparatus

Abstract

An overheating prevention apparatus for use in a display apparatus is provided. The display apparatus comprises at least one fan running at at least one initial rotation speed. The overheating prevention apparatus comprises a first temperature sensor, a second temperature sensor and a processing module. The first temperature sensor is used for sensing an environment temperature and generating a first signal according to the environment temperature. The second temperature sensor is used for sensing an inner temperature of the display apparatus and generating a second signal according to the inner temperature. The processing module adjusts the at least one fan from the at least one initial rotation speed to at least one first running rotation speed according to the first signal and the second signal. The display apparatus using the present invention can automatically adjusts the speed of the fan so that the display apparatus works correctly.

What is claimed is: 
     
         1 . An overheating prevention apparatus for use in a display apparatus, the display apparatus comprising at least one fan, the at least one fan running at at least one initial rotation speed, the overheating prevention apparatus comprising:
 a first temperature sensor, being configured to sense an environment temperature and generate a first signal according to the environment temperature;   a second temperature sensor, being configured to sense an inner temperature of the display apparatus and generate a second signal according to the inner temperature; and   a processing module, being configured to adjust the at least one fan from the at least one initial rotation speed to at least one first running rotation speed according to the first signal and the second signal.   
     
     
         2 . The overheating prevention apparatus as claimed in  claim 1 , wherein the processing module further comprises:
 a memory, being configured to store a first corresponding relation table of the environment temperature and the inner temperature;   wherein the processing module determines an environment height according to the first signal, the second signal and the first corresponding relation table during a default time period, and adjusts the at least one fan from the at least one initial rotation speed to the at least one first running rotation speed according to the environment height.   
     
     
         3 . The overheating prevention apparatus as claimed in  claim 2 , wherein the memory is further configured to store a second corresponding relation table of the environment temperature and the at least one first running rotation speed, and the processing module is further configured to adjust the at least one fan from the at least one first running rotation speed to at least one second running rotation speed according to the first signal and the second corresponding relation table. 
     
     
         4 . The overheating prevention apparatus as claimed in  claim 2 , wherein the memory is further configured to store a first upper bound value, and the processing module is configured to shut down the display apparatus according to the first signal while the environment temperature is over the first upper bound value. 
     
     
         5 . The overheating prevention apparatus as claimed in  claim 2 , wherein the memory is further configured to store a second upper bound value, and the processing module is configured to shut down the display apparatus according to the second signal while the inner temperature is over the second upper bound value. 
     
     
         6 . A projection apparatus, comprising:
 at least one fan, wherein the at least one fan runs at at least one initial rotation speed;   a first temperature sensor, being configured to sense an environment temperature and generate a first signal according to the environment temperature;   a second temperature sensor, being configured to sense an inner temperature of the projection apparatus and generate a second signal according to the inner temperature; and   a processing module, being configured to adjust the at least one fan from the at least one initial rotation speed to at least one first running rotation speed according to the first signal and the second signal.   
     
     
         7 . The projection apparatus as claimed in  claim 6 , wherein the processing module further comprises:
 a memory, being configured to record a first corresponding relation table of the environment temperature and the inner temperature;   wherein the processing module determines an environment height according to the first signal, the second signal and the first corresponding relation table during a default time period, and adjusts the at least one fan from the at least one initial rotation speed to the at least one first running rotation speed according to the environment height.   
     
     
         8 . The projection apparatus as claimed in  claim 7 , wherein the memory is further configured to store a second corresponding relation table of the environment temperature and the at least one first running rotation speed, and the processing module is further configured to adjust the at least one fan from the at least one first running rotation speed to at least one second running rotation speed according to the first signal and the second corresponding relation table. 
     
     
         9 . The projection apparatus as claimed in  claim 7 , further comprising a power circuit, wherein the memory is further configured to store a first upper bound value, and the processing module is configured to shut down the projection apparatus by controlling the power circuit according to the first signal while the environment temperature is over the first upper bound value. 
     
     
         10 . The projection apparatus as claimed in  claim 7 , further comprising a power circuit, wherein the memory is further configured to store a second upper bound value, and the processing module is configured to shut down the projection apparatus by controlling the power circuit according to the second signal while the inner temperature is over the second upper bound limit.