One of the thyristor voltage-regulated drying room temperature control circuits

It uses thyristor voltage regulation to control the temperature of the thermostatic furnace . For constant temperature (heat preservation), use 0~
160V DC (thyristor single-phase and half-controlled); when rapid heating is required, use 220V AC for heating. The temperature measuring element uses a temperature relay
. The main circuit voltage of the synchronous transformer T and the thyristor V are in the same phase, and a resistor-capacitor (RP, C) phase-shift trigger circuit is used,
with a conduction angle of O. ~170. , the maximum output voltage of thyristor V is about 160V.
    By adjusting the potentiometer RP, the conduction angle of the thyristor V can be changed, thereby changing the voltage across the electric heater EH.