An Active Thermal Control Method for Power Devices in Complex Convective Environments

Abstract

The invention relates to an active thermal control method of a power device in a complex convection environment. The method includes: measuring the ambient temperature, the output current and the shell temperature of the power device at the first K moments in the complex convection environment, and combining the shell and the environment The historical environmental thermal resistance sequence is obtained from the thermal model between them; the Markov chain is used to randomly simulate the historical environmental thermal resistance sequence to generate the environmental thermal resistance sequence at M moments in the future; the future M moments at different current values ​​are calculated according to the thermal model The case temperature sequence of the power device, repeat the random simulation of the environmental thermal resistance sequence and the calculation of the case temperature sequence of the power device N times, obtain the number of case temperature over-temperature points, calculate the over-temperature probability, and select the appropriate current constraint according to the probability requirement; The power device in this convective environment implements active thermal control with current constraints; thereby solving the problem of unreliable active thermal control caused by the fluctuation of environmental thermal resistance in the existing power device in a complex convective environment, and its output current is relatively smooth .

Description

technical field [0001] The invention belongs to the field of thermal control of power devices, and in particular relates to an active thermal control method for power devices in a complex convection environment. Background technique [0002] With the continuous development of power electronics technology, power devices such as IGBT and MOSFET are widely used in important fields such as renewable energy and motor drive. However, due to the continuous improvement of its power density level requirements, various failures caused by high temperature are prone to occur. Therefore, it is necessary to obtain the temperature of the power device in real time, perform thermal control and over-temperature protection on it, so as to improve the thermal safety of the device operation. [0003] When the power device continues to work at high current, its high temperature will easily cause failure; and if it works according to the specified rated current, it is too conservative and it is d...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an active thermal control method for power devices in complex convection environments, which solves the problem of unreliable active thermal control of existing power devices in complex convection environments due to fluctuations in environmental thermal resistance

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