Insole with electric heating. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Medicine
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How often do you hear that due to poor heating or its absence, people freeze in their apartments. The disabled, the elderly and children suffer the most. The whole arsenal of possible means is used to fight the cold: warm clothes, electric heaters, plastic bottles with hot water and much more. It would be nice to have a suit with electric heating, which, as they say, is used in the north.
There are probably few people who have seen and know what it is. It is difficult to create an electrically heated suit on your own, but electric insoles for heating your feet are possible.
The insole shown in Figure 1 is made for size 43 shoes.
The base of the insole is made of thin textolite, but thick cardboard can also be used. Along the edges of the insole with a step of 5 mm, cutouts are made for laying enameled copper winding wire with a diameter of 0,18 mm, which is used as a spiral. The brand of wire does not matter. When winding from heel to toe, the wire is laid through one turn. Between the turns of the forward stroke, the reverse turns are laid. Thanks to this winding, the beginning and end of the wire remain in the heel of the insole. On the edge of the heel in the insole, you need to fix two metal brackets, to which the spiral wires and insulated flexible wires are soldered.
After that, the insole is sewn into a specially made case made of thick cardboard. For the cover, two cardboard halves are cut out in the form of an insole, but larger than it. First, one side of the cover is sewn, and after inserting the insole, the second. Two flexible wires are located behind the insole. The second one is made in the same way. The insoles can be powered both from a car battery and from a 220 V network through a transformer.
If you use battery voltage, then you need to make a simple electronic voltage regulator. Regulator circuits are widely described in amateur radio literature. When choosing power, you can be guided by the diagram (Fig. 2), which shows the dependence of the consumed current on the voltage for one product.
In this regard, the regulator must withstand a current of at least 4 A. With the network version, the easiest way is to connect through a transformer TS-180-2. This transformer was widely used in old tube TVs. Two levels of voltage taken from the filament windings are used - 6,3 and 12,6 V. The switch installed on the transformer chassis is used to switch the supply voltage of the insoles. Be sure to install two fuses: one at the input and the other at the output of the transformer. Connection of insoles parallel.
The disadvantage of the product lies in the impossibility of using it in movement over long distances, only short movements. The most successful version of the insole, inserted into slippers, or without them, on a wooden stand.
For more convenient use, it is recommended to install miniature connectors on the wires coming from the insoles. The winding parameters are not critical, so changing the size of the base cannot seriously affect the operation of the product. If problems nevertheless arise, they can be eliminated by changing the number of turns or a serial connection scheme.
Author: S.M. Usenko
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