Patent ID: 8061894
Filing Date: 2011-11-22
Classification: G01K

Abstract:
1. A temperature detection circuit, comprising: one or more diodes connected in series; a constant current source connected to said one or more diodes; and an output unit for outputting a voltage or a current according to a voltage difference between a comparison voltage generated by said one or more diodes, such that said comparison voltage changes with a temperature change of said one or more diodes, and a reference voltage, said reference voltage comprising a constant voltage, wherein said output unit comprises a subtracter for subtracting said comparison voltage from said reference voltage, said subtracter includes a first operational amplifier in which an inverting input terminal is connected to the reference voltage and a non-inverting input terminal is connected to said comparison voltage, a voltage current converter for converting an output voltage of said subtracter into a current, and a current voltage converter for converting the current outputted from said voltage current converter into a voltage, and wherein said output unit does not output the voltage or the current until a predetermined temperature, and outputs the voltage or the current proportional to a voltage difference between the reference voltage and the comparison voltage generated by the temperature from the predetermined temperature.