A microprocessor sends a switching signal to the extraction valve of a small combustion gas container during the critical discharge state of its supply capacitor. This gas is oxidized at the surface of a catalyst or a jet injector burner with the supply of air oxygen. The resulting temperature difference is detected by a thermoelement and converted into electrical energy based on the Seebeck effect. When the full capacitor capacity is reached, the heat energy generation through gas oxidation is stopped. The energy generation and conversion are automatically controlled by a microcontroller.