Patent ID: 6494777
Filing Date: 2002-12-17
Classification: B60H,F24F,Y02B

Abstract:
A carbon dioxide concentration modulating device, comprising:a carbon dioxide concentration detecting module for detecting concentration of ambient carbon dioxide and for outputting a voltage signal corresponding to the detected concentration of carbon dioxide; an air-conditioning mechanism for introducing external air; and an air-conditioning controlling module connected to the carbon dioxide concentration detecting module and the air conditioning mechanism, for receiving the voltage signal outputted from the carbon dioxide concentration detecting module, and for processing the voltage signal to interpret the detected concentration of carbon dioxide so as to drive the air conditioning mechanism to operate, wherein the air-conditioning controlling module is preset with predetermined upper and lower limit values of carbon dioxide concentration, and includes an amplification circuit, a signal filter, a comparison circuit and a drive controlling module; wherein the amplification circuit and the signal filter respectively amplify and filter the voltage signal so as to allow the comparison circuit to output a signal to the drive controlling module for driving the air conditioning mechanism to introduce external air if the detected concentration of carbon dioxide reaches the predetermined upper limit value, and to allow the comparison circuit to output another signal to the drive controlling module for driving the air conditioning mechanism to stop the air introduction if the desired concentration of carbon dioxide reaches the predetermined lower limit value.