A Practical Primer On Motor Drives (Part 9): Power Semiconductors As Implemented In Power Conversion Systems

Focus:

This section introduces the common power conversion topologies, explaining in broad terms how they work and the types of outputs they produce. The topology discussion begins with single-device configurations of buck and boost stages, then moves onto the multi-device topologies—the half-bridge and full bridge (H-bridge). The latter subject covers both the standard (single-phase) and cascaded (three-phase) H-bridges with descriptions of both the sine-modulated and six-step commutated PWM control techniques. Both the half bridge and H- bridges produce two levels of output voltage albeit with different degrees of control over output voltage and current. For those drive applications requiring even greater control over these parameters or the ability to reach higher output voltages, there are multi- level topologies, which are also introduced here.

What you’ll learn:

• How to understand the operation of the basic power topologies used in motor drives
• How to understand the operation of sine-modulated and six-step commutated PWM control techniques

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Author & Publication:

Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y., How2Power Today, Oct 15 2016

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