Heat sink blocking degree determination method and device of converter device

The embodiment of the invention provides a heat sink blocking degree determination method and device of a converter device. The method comprises the steps of acquiring a first temperature of a heat sink; determining first thermal resistance according to the first temperature, a preset temperature and power loss of the converter device; determining first group of sample data and second group of sample data which are corresponding to the first thermal resistance in a sample database, wherein each group of sample data in the sample database comprises a time frame and thermal resistance of the heat sink after running for the time frame, and the first thermal resistance is arranged between second thermal resistance in the first group of sample data and third thermal resistance in the second group of sample data; and determining the blocking degree of the heat sink according to the first thermal resistance, the first group of sample data and the second group of sample data. By the method, the accuracy of determinin