In the present invention, a heat spreader, circuit boards for power semiconductor elements, and a circuit board for a control circuit are fixed on a metal plate. The heat spreader is made of an IMS. The IMS has a metal base made of Cu or Cu clad plate, and a high heat radiating insulating layer made...http://www.google.com.au/patents/US5513072?utm_source=gb-gplus-sharePatent US5513072 - Power module using IMS as heat spreader
