By Marty Brown
В книге описана разработка и схемотехника различных источников питания.Newnes has labored with Marty Brown, a pace-setter within the box of energy layout to choose some of the best design-specific fabric from the Newnes portfolio. Marty chosen fabric for its timelessness, its relevance to present energy provide layout wishes, and its real-world method of layout concerns. unique cognizance is given to switching energy provides and their layout concerns, together with part choice, minimization of EMI, toroid choice, and breadboarding of designs. Emphasis is additionally put on layout innovations for energy offers, together with case histories and layout examples. it is a ebook that belongs at the workbench of each energy offer fashion designer!
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Extra info for Power Sources and Supplies: World Class Designs
So, for example, we probably already know intuitively that we need bigger cores to handle higher powers. The energyhandling capability of the selected core must, at a bare minimum, match the energy we need to store in it in our application—that is, 1/2 ϫ L ϫ I 2PK. Otherwise the inductor will saturate. 6, we have plotted the energy, E ϭ 1/2 ϫ L ϫI 2PK , as a function of r. 4. 4, we will certainly need a very large inductor. On the other hand, if we increase r, there isn’t much greater reduction in the size of the inductor.
Therefore, defining the “worst-case” voltage (for inductor design) as the point of the input voltage range where the peak current is at its maximum, we need to design/select our inductor at this particular point always. This is in fact the underlying basis of the general inductor design procedure that we will be presenting soon. We will now try to understand where and why we get the highest peak currents for each topology. 3, we have drawn various inductor current waveforms to help us better visualize what really happens as the input is varied.
Indicates—IDC is increasing and is equal to IO The inductor current waveform is considered to have another (independent) component besides its swing I: this is the DC (average) level IDC, defined as the level around which the swing I takes place symmetrically—that is, I/2 above it, and I/2 below it. 1. ” It is sometimes also called the platform or pedestal of the inductor current. The important point to note is that IDC is based only on energy flow requirements—that is, the need to maintain an average rate of energy flow consistent with the input/output voltages and desired output power.
Power Sources and Supplies: World Class Designs by Marty Brown