MODE OF DEFINITION OF THERMAL RESISTANCE TRANSITION-BODY OF POWER OF SEMI-CONDUCTIVE DEVICES FULFILLED IN A BODY Russian patent published in 2007 - IPC G01R31/26 

FIELD: the invention refers to measuring technique of thermal parameters of power semi-conductive devices fulfilled in a body and may be used for quality control.

SUBSTANCE: the technical result is in possibility of definition of thermal resistance transition-body of thyristors and symistors, more simple realization of sources of heating and measuring currents, simplification of the processing of measuring results. The essence is in that constant measuring current I_measure of a given value is passed through a tested device. In the initial thermodynamic balance in a moment of time t₀ the values of the thermo-sensitive parameter u_hc(t₀)and the temperature of the body T_C(t₀) are measured and stored. From the moment of time t₁ to the moment of time t₂ the device is heated by the current i_heat of arbitrary shape. During the heating process in the moments of time of n interval of measuring and storing of the thermo-sensitive parameter the values of the current are measured and stored, an average power of n interval of measuring of losses is calculated. From the moment of the time t₁ the value of the heating current i_heat is increased from minimal equal to the value of the constant measuring current I_measure, and at comparison of the value of the calculated average power of losses on n interval of measuring with preliminary installed maximally feasible power P_max it is necessary to stop increasing of the value of the heating current i_heat continuing the heating process. In the moment of time t₂ the passing of the heating current i_heat is interrupted and the values of the thermo-sensitive parameter U_hc(t₂) from passing of constant measuring current^{I_measure andof the temperature of the body T_C(t₂) is measured and stored. After the moment of time t₂ in the regime of natural cooling till achieving the hydrodynamic balance in the moment of time t₃ the values of the thermo-sensitive parameter U_hc(t₃) and the temperature of the body T_C(t₃)are measured and stored and thermal resistance of transition-body is calculated.}

EFFECT: creates effective and convenient mode of diagnostics.

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