Showing papers on "Microheater published in 1987"
Patent•
04 Jun 1987
TL;DR: In this paper, a microheater for heating a PTC thermistor and means for variably setting the quantity of power supply, in the temperature control unit such as a hair drier or the like, is presented.
Abstract: PURPOSE:To make it possible to conduct a stable air flow temperature control and make the set temperature variable in a wide range by providing a microheater for heating a PTC thermistor and means for variably setting the quantity of power supply, in the temperature control unit such as a hair drier or the like CONSTITUTION:A heater 7 is connected in series to a phase control element 14, and connected to a commercial power source 17 A series circuit of a PTC thermistor 10a and a capacitor 16 is connected in parallel to the phase control element 14, and a junction between the PTC thermistor 10a and a capacitor 16 is connected to the gate of the phase control element 14 A series circuit consisting the microheater 10b of the PTC thermistor 10a and the capacitor 16 and a variable resistor 9 is connected in parallel to a series circuit of the heater 7 and the phase control element 4 By adjusting the variable resistor 9, the PTC thermistor 10a is heated by the PTC thermistor 10b to make a temperature difference between an air flow temperature due to the heater 7 and a temperature detected by the PTC thermistor 10a, the setting of the air flow temperature is carried out, and the change of the air flow temperature is detected as usual in the PTC thermistor 10a Hence, the control of the air flow temperature does not get unstable