The result is that in the real world the output waveforms look much more like Figure 2 rather than Figure 1, even with a good layout and ceramic output capacitors. This tends to excite parasitic inductances in the switch, the layout, and the output capacitors. The issue that makes an output filter so important for a boost or any of the other topologies with discontinuous current mode is the fast rise and fall in the current time in Switch B. Basic voltage and current waveforms for a boost converter. & amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp lt img src=' ' alt='Figure 1'& amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp amp gt įigure 1. Shown in Figure 1 are the basic wave forms in a boost converter in constant-current mode (CCM). In this article, boost circuits will be used for the example circuits, but the results will be directly applicable to any dc-to-dc converter. In addition, it is important to realize how the filter design will affect the compensation of the switching power converter. Therefore, there is a need to be able to design optimized, damped multistage filters to clean up the output from switching power converters. Even in those demanding applications where an extremely low noise supply is required, there is probably a switching circuit somewhere upstream in the power tree. It has been shown that in many applications an appropriately filtered switching converter can replace a linear regulator for production of a low noise supply. This has kept them out of high performance analog circuits where linear regulators have ruled the roost. However, they have the major drawback in that their outputs can be noisy due to the high switching transients. They are valued for their small size, low cost, and efficiency. These days switching power supplies are nearly ubiquitous and used throughout every electronic device. Designing Second Stage Output Filters for Switching Power Supplies
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |