ELECTRIC SOLDERER TEMPERATURE CONTROL DEVICE Russian patent published in 1995 - IPC

FIELD: temperature control systems, namely control devices with temperature sensitive members, for example electric solderers with automatic temperature controlling. SUBSTANCE: a well known temperature control device, having a power thyristor, connected in series in a power supply circuit of a heating member of an electric solderer, a threshold member, a capacitor, a diode, connected with one output lead of the capacitor, connected in series a thermistor and a resistor, also includes a transistor, second and third resistors, forming with the first resistor and the thermistor a measuring bridge circuit, having in one of its diagonal a base-emitter transition of the transistor, whose collector is connected with a gate electrode of the power thyristor; a second diagonal of the bridge circuit is connected between the output of the threshold member and one bus of power supply circuit, the bus being also connected with an anode of the diode. An input of the threshold member is connected with the first output lead of the capacitor, whose second output lead is connected with a second power supply bus. The threshold member may be in the form of a thyristor, whose anode being an input and whose cathode being an output of a Zener diode. The anode of the Zener diode is connected with the gate electrode of the thyristor and the cathode of the Zener diode is connected with the anode of the thyristor. EFFECT: enhanced responsibility of the control device, increased accuracy and stability upon maintaining a predetermined temperature of the solderer. 2 cl, 2 dwg