... such as heat semiconductor ( IGBT,CPU) cooling of UPS,Inverter,PCB,AC drivers and Transducer ... through the cooler, and reach all cooling fins. Especially heatsinks having a very large amount ... on a passive heatsink, there should be fewer cooling fins with more space between them. Therefore, simply ... Good thermal transfer within the heatsink. Large cooling fins are pointless if the heat can't reach ...