Method and apparatus for protecting heat dissipation fan of projecting device

An apparatus for protecting a heat dissipation fan of a projecting device, comprising:

• an obtaining unit and a processing unit;
• wherein,
• the obtaining unit consists of a two-axis or three-axis acceleration sensor, and is arranged to, when the projecting device is in a working state, real-time obtain time information and acceleration information when the projecting device is falling;
• the processing unit is arranged to determine fall state information of the heat dissipation fan according to the fall-related information of the projecting device;
• wherein, the processing unit comprises:
• a fall state information analyzing module and a processing module;
• wherein,
• the fall state information analyzing module is arranged to, determine that the fall state information is a falling state when the acceleration of the projecting device obtained through the acceleration sensor reaches a first threshold and that a duration reaches 200 milliseconds is determined according to the time information;
• determine that the fall state information is a falling static state when the gravitational acceleration of the projecting device obtained through the acceleration sensor is within a second threshold range and that the duration reaches any selected value between 1 and 2 seconds is determined according to the time information;
• wherein the first threshold is a product of any selected value with an absolute value less than 0.2 and a gravitational acceleration;
• the second threshold is an interval value between the products of the gravitational acceleration and 0.8 and 1.2 respectively;
• the processing module is arranged to:
• terminate an operation of the heat dissipation fan when the fall state information is the falling state and the heat dissipation fan is in the working state;
• or turn on the heat dissipation fan when the fall state information is the falling static state and the projecting unit is projecting.