POWER CONVERSION APPARATUS AND METHOD FOR MANUFACTURING THE SAME
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United States of America Patent
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Mar 23, 2017
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Mar 29, 2016
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Abstract
A second lead frame is set onto a conductive layer and a busbar. The second lead frame has holes previously formed at opposite ends thereof, and pieces of solder material or solder pieces are inserted into the holes. Then, the solder pieces are vibrated by an ultrasonically vibrating tool, whereby the solder pieces are melted without having a high temperature. The second lead frame is thus bonded to the conductive layer and the busbar. A semiconductor element and the busbar are connected by a first lead frame and the second lead frame. The connection structure thereof is such that the second lead frame to be bonded by ultrasonic bonding or other bonding methods is not directly in contact with the semiconductor element, which eliminates the risk of damage to the semiconductor element.
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