THE DEVELOPMENT AND APPLICATION OF THE TECHNIQUE OF CALCULATION OF THERMAL BREAKDOWN VOLTAGE IN THE HIGH-FREQUENCY STRUCTURES
The paper deals with the description of a new technique of calculations of the heat release processes at the high and ultra-high frequencies associated with the losses in composite materials (CM) what may cause the destruction of radio components. The study of thermal breakdown is necessary to determine the mechanism and nature of change of dielectric properties. Thermal breakdown influences destructively the composite material radio components or even causes their failure. The heating phenomena are rather complex and the calculation of its origination mechanism, as well as the stages of the origination and development of thermal effect and composite material aging, are scientifically and practically attractive.
The goal of the study is the development of a technique for calculation of heat removal and thermal breakdown voltage in the high-frequency structures both for a structure cooled from the one side and for a structure cooled from two sides.
The author got the formulas for calculation of the thermal breakdown voltage of the small-size insulators both in the cases when the electric field is uniform and in the cases when it is non-uniform.
It is experimentally proved that when increasing the temperature of the environment, the value of thermal overload decreases for the composite dielectric materials. When increasing the frequency, the temperature differential increases; at the high frequencies, large temperature differentials occur in the structures made of composite dielectric materials that cause the destruction.
The calculation technique proposed by the author ensures the calculation accuracy sufficiently high for the practical purpose. The study of the breakdown of the discoid components made of a composite containing titanium dioxide shows that in the interval of frequencies f from 0.5 to 1.5 MHz, the temperature and frequency dependencies of thermal breakdown voltage are compliant with the calculations according to the proposed technique.
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