Discrete Component Solutions vs. Intelligent Power Modules for Low Power VFD (Variable Frequency Drive) Applications: The emergence of SPMTM (Intelligent Power Module) products and the potential for cost-effectiveness provide reason to re-examine the advantages and disadvantages of SPMs versus traditional discrete power devices for low power drive applications. Today, high volume appliance manufacturers such as home and commercial appliances are already implementing SPMs in appliances such as washing machines and refrigerators. This is a strong signal that intelligent power modules can meet the cost and reliability requirements of these high volume appliance manufacturing industries and have the potential to revolutionize the drive circuit industry. Using highly automated epoxy molded wireframe construction combined with modern insulation material technologies such as DBC (Direct Bonded Copper), 600V DIP (Single In-line Package) and SIP (Dual In-line Package) SPMs capable of handling 1A-75A drive currents have been produced. This article will discuss the various specifications of these modules, such as component matching and differentiation, reliability, layout efficiency, added functionality, and thermal management. Our conclusion is that SPMs are becoming increasingly viable in general industrial motor control and home appliance industries. In addition, this article will discuss the latest trends in IGBT, MOSFET and driver circuit design, as well as the impact of this trend on packaging.
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