Hot fast circuit diagram analysis

LED light-emitting diode

I believe many people use too much heat (some also called electric heating rods), but how much do you know about the structure and working principle and safety performance of the hot one? Let me dissect the heat and explain some of its principles. Knowing its structure, we can know how much its safety factor is, and also enable us to use it rationally and safely.

As shown in the figure, SB is the start button switch. When in use, the water level drain electrodes A and B are placed together with the heating tube in the thermos filled with water. Press SB, the transformer T primary heating tube is stepped down and the alternating current is passed. Pressure, secondary to get about 12V AC, through the VD rectification and water level detection electrode M, N between the water resistance, forming a DC of about 10V on C, for the relay K action, K is a small operating voltage of 8V The relay and the LED are LEDs. When the relay K is engaged, the LED is bright, and the contact K is closed, and the electric heating tube RL is electrically heated. When the SB is released, the relay is in the self-holding state, K is always in the closed state, and the RL is kept warm. When the water in the bottle boils, bubbles are formed due to the intense cavitation, so that the M and N are instantaneously disconnected, and K is lost. Electric, K disconnected, complete the heating process.

When the water in the bottle is too small, since the resistance between M and N is large or open, even if SB is pressed, K is kept normally open because the relay does not get the operating voltage.