| 摘要 |
PURPOSE:To obtain a sorting method having excellent reproducibility in practice by selecting a reverse recovery charge Qr under the optimum external conditions to sort a different turning OFF time tq of a thyristor. CONSTITUTION:A reverse recovery charge Qr (b) is selected under the optimum external conditions to sort when classifying the ranks by the turning OFF time tg of a thyristor. For example, the tq of the thyristor 1 is measured by using a circuit, shown, and the charge Qr is calculated by the reverse recovery current IR, i.e., the current 3 flowed to the position of an arrow, and reverse recovery time trr. Then, the correlation between the tq and the Qr becomes, for example, as shown, and the tq is corresponded one by one to the charge Qr by altering a commutation capacitor C0. Further, the optimum external condition of sorting the tq is Qr, and the circuit is devised, thereby increasing the slope of the correlation graph of Qr-tq to enable to sort it excellently. |
