Automatic constant temperature means that when the circuit temperature reaches a certain value, it will automatically enter a constant temperature state to meet the demand. Some electric heating appliances such as electric soldering irons and electric irons in daily use will not only consume a lot of electricity in vain, but also often burn out electric heating cores due to long-time energization work. If a diode is connected in series in the electrical circuit, when the electrical appliance stops working intermittently, the power supply is supplied by the diode half-wave rectifier to limit the current, so that the voltage applied to the electrical appliance drops below 50%, and the electrical appliance is in preheating Status, once used, the electrical input is fully loaded and works normally
The temperature of the tool that converts electrical energy into heat is determined by its own power and the length of the energization time. The larger the wattage, the longer the energization time, the faster the temperature rises, the higher the temperature, and the slower the temperature, the lower the temperature. The heating elements of electric irons include mica skeleton heating elements and metal tube heating elements. The electric iron made of mica skeleton heating element has simple structure, easy manufacturing, relatively uniform heating, and convenient maintenance. The disadvantage is that the heating wire is exposed to the air, oxidizes quickly at high temperatures, has a short life span, is easily affected by humid air, and has insulation properties. Poor. Electric irons made of metal tube heating elements have good mechanical strength, long life, high thermal efficiency, good moisture resistance, safety and reliability, but the manufacturing process is more complicated.