WIND SPEED DETECTING CIRCUIT CAPABLE OF DETECTING THE TIMING FOR REPLACING DUST-PROOF ELEMENT OF ELECTRONIC DEVICE
First Claim
1. A wind speed detecting circuit for detecting a wind speed of an airflow passing through a dust-proof element of an electronic device, said wind speed detecting circuit comprising:
- a heating unit;
a first temperature sensor for detecting a first temperature of an internal portion of said electronic device, thereby generating a first detecting signal;
a second temperature sensor connected with said heating unit for detecting a second temperature of said heating unit, thereby generating a second detecting signal;
a control unit connected with said first temperature sensor and said second temperature sensor for generating a modulation signal according to said first detecting signal and said second detecting signal; and
a driving unit connected with said heating unit and said control unit for generating a driving signal to control operations of said heating unit in response to said modulation signal, so that a temperature difference between said first temperature and said second temperature is maintained constant,wherein a specified relation between said wind speed and said modulation signal facilitates discriminating whether said dust-proof element needs to be replaced.
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Accused Products
Abstract
A wind speed detecting circuit includes a heating unit, a first temperature sensor, a second temperature sensor, a control unit and a driving unit. The first temperature sensor detects a first temperature of an internal portion of an electronic device, thereby generating a first detecting signal. The second temperature sensor detects a second temperature of the heating unit, thereby generating a second detecting signal. The control unit generates a modulation signal according to the first detecting signal and the second detecting signal. In response to the modulation signal, the driving unit generates a driving signal to control operations of the heating unit, so that a temperature difference between the first temperature and the second temperature is maintained constant. A specified relation between the wind speed and the modulation signal facilitates discriminating whether a dust-proof element of the electronic device needs to be replaced.
14 Citations
20 Claims
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1. A wind speed detecting circuit for detecting a wind speed of an airflow passing through a dust-proof element of an electronic device, said wind speed detecting circuit comprising:
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a heating unit; a first temperature sensor for detecting a first temperature of an internal portion of said electronic device, thereby generating a first detecting signal; a second temperature sensor connected with said heating unit for detecting a second temperature of said heating unit, thereby generating a second detecting signal; a control unit connected with said first temperature sensor and said second temperature sensor for generating a modulation signal according to said first detecting signal and said second detecting signal; and a driving unit connected with said heating unit and said control unit for generating a driving signal to control operations of said heating unit in response to said modulation signal, so that a temperature difference between said first temperature and said second temperature is maintained constant, wherein a specified relation between said wind speed and said modulation signal facilitates discriminating whether said dust-proof element needs to be replaced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electronic device comprising:
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a fan for inducing an airflow; a dust-proof element facing to said fan for obstructing dust contained in said airflow; and an electronic wind speed detecting device having a wind speed detecting circuit for detecting said airflow passing through said dust-proof element at a lower wind speed ranged from 0 to 6 m/s and discriminating whether said dust-proof element needs to be replaced. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification