Working Principle Of Electric Blanket

There are many kinds of temperature regulating devices for Electric blanket, and the degree of simplicity is different. Here is a temperature control device for NE555 time base circuit.
As shown in the Working Principle Diagram of Electric blanket, IC in the figure is NE555 time base circuit; RP3 is a temperature regulating Potentiometer whose sliding arm potential determines the trigger potential V2 and threshold potential Vf of the IC, and V5=Vf=2Vz. After the 220V AC voltage is reduced by C1.R1 current limiting, D1.D2 rectification, C2 filtering, and DW stabilization, a voltage of about 9V is obtained for IC use. Connect the power supply at room temperature, and the temperature gradually increases due to the V2 electric heating wire being turned on for heating. The thermal sensor BG1 increases its penetration current Iceo and V2 with the increase of temperature V6 raised. When V2>Vz and V6 ≥ Vf, the IC flips, pin ③ becomes low potential, BCR stops heating the hot wire of the postal and telecommunications bureau, and the temperature begins to gradually decrease. The Io of BG1 gradually decreases, and V2. V6 decreases. When V6
Electric blanket
Component selection: BG1 can choose PNP type germanium tubes such as 3AX and 3AG; BCR uses small plastic encapsulated bidirectional thyristor with a voltage of 400V or above, and other components can be selected according to the icon.
Key points of production: The thermal sensor BG1 can be led out with a temperature resistant thin flexible wire, and installed into an aluminum shell of a capacitor along with the pin connector. Inject thermal conductive silicone grease to make a temperature probe. When using, place the probe in an appropriate position.