There are two modular meaning, one is the modular power devices, and the second refers to the modular power supply unit. The most common device module, containing one unit, two units, six units up to seven dollars, including switching devices and associated anti-parallel freewheeling diode, in essence, are "standard" power module (SPM).
In recent years, some companies to switch the device driver protection circuit is also fitted to the power module to form the "smart" power module (IPM), not only reduced the size of the machine, more convenient the machine design and manufacturing.
In fact, due to increasing frequency, resulting in parasitic lead inductance, parasitic capacitances become increasingly serious, resulting in greater power to the device stress (expressed as over-voltage, over current spikes).
In order to improve system reliability, some manufacturers developed a "user-specific" power module (ASPM), which put a whole have almost all the hardware in the form of chips installed in a module, not between the components the traditional lead connections, such modules undergo a rigorous and reasonable heat, electricity, mechanical design, to optimize the perfect position.
It is similar to the user-specific integrated circuit microelectronics (ASIC).
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