Refrigeration – With indicator or tester – Condition sensing
Reexamination Certificate
2010-02-12
2011-11-22
Allen, Andre (Department: 2855)
Refrigeration
With indicator or tester
Condition sensing
C374S112000, C702S045000
Reexamination Certificate
active
08061152
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.
REFERENCES:
patent: 2006/0100796 (2006-05-01), Fraden et al.
patent: 2006/0196196 (2006-09-01), Kates
patent: 2007/0152552 (2007-07-01), Shih et al.
patent: 2008/0016888 (2008-01-01), Kates
Chang Ren-Chun
Hsiao Wu-Hua
Allen Andre
Delta Electronics , Inc.
Kirton & McConkie
Witt Evan R.
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