![]() On top of that, many drive circuits include additional functionality: Provide enough current to charge and discharge the gates fast enough.Translate the input voltages to suitable levels to drive the gates. ![]() The drive circuitry for an H-Bridge is basically the electronics that sits between the PWM (and potentially other) digital control inputs and the MOSFET gates. To make referencing easier, let’s review the H-Bridge circuit: Understanding of the various drive-modes will also be useful, so reading the sign-magnitude drive, the lock anti-phase drive and the asynchronous sign-magnitude drive articles isn’t a waste of time either, though those pieces go into quite a bit of more detail than what is needed to follow this text. You will take the most out of this write-up if you are already fairly familiar with H-Bridge basics, so if you aren’t, I suggest you read the introductory piece of the series first. We will discuss the trade-offs between them and what influences the various parameters of the drive circuits. In this article I will go through the available options for drive circuits. In the previous installment of the series we’ve gone through the high-level design decisions that you have to make when designing an H-Bridge, and we’ve discussed the considerations for selecting the MOSFETs and the catch diodes that will make up the bridge. ![]()
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