h-bridge basics

Posted on Feb 5, 2014

Learn how to build h-bridges from many on- and off-line resources. After all these circuits are not terribly complicated. Some of those resources are good, some are not so much. However when I`ve started working with them, I`ve realized that many of my experiences were not documented and some of the things I`ve learned seemed to be missing

h-bridge basics
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from those descriptions. So I decided to write down what I`ve learned and try to organize that description into an easy to understand yet comprehensive structure. This work started off as a three-part series I`ve written, while developing the µModule H-bridge. While the current material is based on those articles, it corrects many errors and is expanded and updated greatly. My intention is to cover more ground than most articles I`ve seen on the subject. While I don`t expect the you, dear reader, to be familiar with h-bridges or motors controllers in general, I do build upon basic electrical circuit understanding. So if you don`t know what a resistor, an inductor or a capacitor is, if you don`t understand at least the basics of time- and frequency-domain circuit analysis, you`re not reading the right article. You probably won`t be able to follow the discussion. But if you`re interested in motor control background information, if you want to understand the reasons behind design decisions, if you want to gain deeper knowledge not just in the h-bridges, but in what goes on before and after them, you have found your place. The switching elements (Q1. Q4) are usually bi-polar or FET transistors, in some high-voltage applications IGBTs. Integrated solutions also exist but whether the switching elements are integrated with their control circuits or not is not relevant for the most part for this discussion. The diodes (D1. D4) are...

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