Electrical characteristics of two-layer structure varistor ceramics–PPTC nanocomposite

Анотація

Electrical characteristics of experimental two-layer structure based on layers of varistor ceramics and polymer nanocomposite with carbon filler being in thermal contact are studied. A layer of such polymer nanocomposite is used in PPTC fuses of the PolySwitch technology. The dependences of the output voltage on the varistor layer, current and temperature on the input voltage applied to the entire structure are analyzed. It is shown that with an increase in the input voltage, the output voltage reaches a certain value and does not change after that. It is concluded that the two-layer structure of varistor ceramics–PPTC nanocomposite type can be used as a limiter of constant electrical voltage and for protection of electrical circuits from long-term alternating electrical overvoltages.