Lecture 6: DC/DC, Part 2

MIT 6.622 Power Electronics, Spring 2023
Instructor: David Perreault

The operational capabilities of a converter are heavily influenced by switch implementation. Switch implementation, external networks, and control are used in analyzing converters and identifying power flows. The inverting buck-boost converter is introduced as an analysis example.

License: Creative Commons BY-NC-SA

[SkyhawkSteve]

As a retired EE, I am enjoying this review of switching converters! The technology has changed so much since I started in the 80's! It's become more "commoditized" and easier for the non-specialist to use. The biggest hurdles always seemed to be the design of the control loop and the magnetics. Lots of ways to get into trouble, but a fascinating challenge! Thanks for the videos!

[nraynaud]

around 19:00, it might be interesting to put the reverse voltage and freewheeling diodes in the context of inductive loads, to drive the point home that you don't always "design" the switch polarity, they might happen at the output against your will.

[Rory-jkus]

I would suggest that the buck-boost converter with the capacitor across the top is a bad design because at power up the positive input voltage will flow to what is supposed to be the negative voltage output. In other words there will be a transient of positive voltage at the output.

[JordanDavid]

Three videos in and still no mention of threshold voltage of diodes… whats are they, 0.7 to turn on and 0.3? To shut off or something?

[gordonmax]

Hello Professor,

What is the reference textbook did you use?

[dominiquejones]

Where is part two and lecture. 1? I can help organize your YouTube. I'm completely lost. 4 lesson are missing at least