| 摘要 |
<p>PURPOSE:To attain an output currents of high quantity effectively by a method wherein an inlet for a cooling medium is formed at the semiconductor element side, the allowable temperature of junction thereof is lower, when semiconductor elements, the allowable temperature of junction thereof differs, are bridge-connected. CONSTITUTION:When the power converter is formed by bridge-connecting diodes SR-UP, SR-VP and SR-WP and thyristors THY-UN, THY-VN and THY-WN, the thyristors THY are connected and arranged to the negative pole N side and the diodes SR to the positive pole P side. When the power converter is mounted to a rectifier box 6 through cooling pieces 3, the thyristors THY, the allowable temperature of junction thereof is lower than the diodes SR, are cooled by cooling air 4 at the inlet side with a low temperature. Thus, the converter can be formed in reasonable cooling structure, and output currents can effectively be changed into currents with high output.</p> |
