Power device quality grade classification method

Abstract

The invention provides a power device quality grade classification method. The method comprises the steps of: providing power devices; performing a thermal response test and an electrical parameter test on the power device, and performing calculation to obtain a variable quantity; determining a standard value domain and an allowable change range, and judging whether a thermal response test resultand an electrical parameter test result meet the standard value domain or not; judging whether the variation exceeds an allowable variation range or not; establishing a quality grade classification standard, wherein the quality grade classification standard comprises a quality grade, the quality grade comprises a test index of a thermal response test, a test index of an electrical parameter test and a judgment index corresponding to a variable quantity, each test index and each judgment index correspond to a reference range, and each reference range corresponds to a score; based on the thermalresponse test result, the electrical parameter test result and the reference range to which the variable quantity belongs, endowing corresponding scores to the thermal response test result and the electrical parameter test result; summing the thermal response test result, the electrical parameter test result and the score corresponding to the variable quantity to obtain a total score; and performing grade classification based on the score and the total score.

Description

technical field [0001] The invention relates to the technical field of power device screening, in particular to a method for classifying power device quality grades. Background technique [0002] Before the power device is put into formal application, it is necessary to remove early failures or poor quality products in the batch. The specific removal method is to conduct various electrical parameter tests on the power device, and compare the test results of each electrical parameter with the test standards of each electrical parameter. For comparison, if the test results of all electrical parameters meet the test standards, it will be judged as a qualified power device; if one of the electrical parameter test results does not meet the test standards, it will be judged as an unqualified power device, and it will be removed from the batch removed. [0003] However, the range of the current electrical parameter test standards is relatively wide, such as the I GSS (Gate source...

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Problems solved by technology

[0003] However, the range of the current electrical parameter test standards is relatively wide, such as the I GSS (Gate source leakage current) parameter test standard is 0-100nA, and I GSS = 5nA and I GSS = 50nA power devices have significant differences in quality grades and service life. Therefore, it is urgent to propose a method for classifying power devices in order to finely classify power devices

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