| 摘要 |
[Summary] [Subject] In a high-capacity module, while attaining reduction in size and weight, reduction in serge, and reduction in a loss, overheating of the module due to the curvature of a power circuit board accompanying thermal expansion of a composition member of the power circuit due to heat generation from a high exothermic element should be prevented. [Solution means] A drive circuit is laminated via a high exothermic element disposed on a power circuit, and it is configured so that the average thermal expansion coefficient of the side of the power circuit of the drive circuit board may be larger than the average thermal expansion coefficient of the side opposite to the power circuit. Thereby, the drive circuit board will be curved in the same direction as the power circuit board when the power circuit board is curved due to heat generation from the high exothermic element accompanying the operation of the module. Thereby, in a high-capacity module, while attaining reduction in size and weight, reduction in serge, and reduction in a loss, poor junction between the high exothermic element of the power circuit and the drive circuit board can be suppressed and heat generating from the high exothermic element can be more effectively released. |
