Wire breaking detection method for temperature sensor and temperature sensing apparatus for using the method

A temperature sensing apparatus for measuring temperature of an electric driven device comprising:

• a temperature sensor outputting equivalents of resistance of a thermal resistor that is contained therein and disposed near said electric driven device;
• a current measuring device measuring quantity of current that is applied to said electric driven device;
• and
• a temperature detection circuit detecting temperature of said electric driven device according to said output equivalents from said temperature sensor;
• wherein
• said temperature detection circuit judges whether a predetermined quantity of current is applied to said electric driven device during a predetermined time according to quantity of current measured by said current measuring device, compares temperature detected by said temperature detection circuit with a predetermined temperature when said predetermined quantity of current is applied to the electric driven device during said predetermined time, and decides a wire breaking of said thermal resistor when said detected temperature is lower than said predetermined temperature.

A temperature sensing apparatus for measuring temperature of an electric driven device comprising:

• a temperature sensing means for outputting equivalents of resistance of a thermal resistor that is contained therein and disposed near said electric driven device;
• a current measuring means for measuring quantity of current that is applied to said electric driven device;
• and
• a temperature detection means for detecting temperature of said electric driven device according to said output equivalents from said temperature sensing means;
• wherein
• said temperature detection means judges whether a predetermined quantity of current is applied to said electric driven device during a predetermined time according to quantity of current measured by said current measuring means, compares temperature detected by said temperature detection means when said predetermined quantity of current is applied to the electric driven device during said predetermined time with a predetermined temperature, and decides a wire breaking of said thermal resistor when said detected temperature is lower than said predetermined temperature.