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(The caveat is for the arena of lab supplies that are required to be extremely free of electrical noise-these still tend to be hears, but usually only low power ones.) The switching regulator design makes them of course vastly lighter than their older counterparts, but does leave them prone to the ills that afflict switchers, a subject that will be recurring throughout this book. New supplies are (almost) invariably based on switching regulators. This reliance on steel guarantees that some supplies that are old now will still be around when you’re ready to retire! They just never seem to break the author is personally aware of labs with quite a few old lab supplies dating from WW 11. The rest of the volume of the supply houses a fan to keep the linear regulator from burning up. The old lab supplies then act by linear-regulating the voltage down, and end up with a really big capacitor. The reason for their great weight is that there is a big hunk of steel inside, acting as a 60Hz (or 50Hz) transformer.

The most obvious difference between lab supply types is between old lab supplies and new: you can easily tell which is which because the old ones seem to weigh a million pounds. Still, there are a few surprises to be had, even with these supposedly ideal sources. Lab Supplies Everybody uses lab supplies to begin development work on a new converter. This is a subject that seems to be always ignored, both in the lab and in texts, or at least pushed to the side when time becomes short and yet it is of critical importance both to you and the people who work for you, and for visitors to areas in which your lab work is taking place. This introductory chapter also makes a few comments on lab safety. Don’t take these discussions to be comprehensive, as some of the sources and loads have a large literature attached to them rather, this material is intended to give the flavor of the sorts of environment in which power supplies often need to operate. The samples here are of course not exhaustive, but rather represent some of the (occasionally not so nice) experiences of the author in the power range under consideration you can start your own collection. To start off this book, then, examples of sources and loads, both common and less so, are presented in some detail, to give you a feel for the sorts of thing you may encounter. Unless you have spent many years designing converters, you probably don’t realize how truly diverse these two groups are-this is one of the things that makes power supply engineering far more challenging than, say, digital design.

This reason is twofold: the wide variety of sources from which converters are expected to run, and the similarly wide variety of loads converters are expected to provide power to. (Chapter 2 on topology talks about the various types.) There is an excellent reason for having many different kinds, rather than having all power supplies be mere variations of parameter values on a single type.

If you are in this group, you probably already have some experience with converters, at least to the extent of realizing that there are many different kinds. This book is targeted at designers of power supplies in the low to medium power range, roughly defined as OW to 1OkW.

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