A Practical Primer On Motor Drives (Part 9): Power Semiconductors As Implemented In Power Conversion Systems
by Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y., How2Power Today, Oct 15 2016
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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