By Richard Lee Ozenbaugh
Providing basic equipment of measuring AC and DC strength strains, this hugely renowned, revised and improved reference describes the choice of cores, capacitors, mechanical shapes, and types for the timeliest layout, development, and trying out of filters. It provides analyses of matrices of assorted clear out varieties in line with shut approximations, remark, and trial and blunder. offering easy parameters and strategies for growing manufacturable, repeatable items, the second one variation presents insights into the reason and removal of universal mode noise in traces and kit, explores new information on spike, pulse, trapezoid, and quasisquare waves, and experiences the newest high-current filters.
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Additional info for EMI Filter Design Second Edition Revised and Expanded (Electrical and Computer Engineering)
Would this lower the resonant rise? Of course it would, but now you have 5 dB at 4000 Hz. So what is the gain at 400 Hz? About the same as before, but I have seen cases where this fix made the condition worse, The resonant frequency dropped in dB but was also moved to a lower frequency, negating the fix. Another method is the Cauer, or elliptic, filter. In a multistage filter one (or two) of the inductors is tuned to, in this example, 100 kHz. This adds many dB of loss, allowing all the filter component values to decrease until the filter loss is brought back to the needed 80dB at l00 kHz.
The best possible solution is a multistage in each leg with Cauer filters to bring the resonance rise as high in frequency as possible to reduce the voltage rise. The common mode inductor should have the neutral (if required) wire wound on the core as well as legs A, B, and C. The unbalanced current will flow through the neutral wire and through the common mode inductor, canceling the unbalance within the common mode core. To review, if this is a three-phase 400-Hz filter requiring substantial differential mode loss, the easiest to design is the individual removal filter or the insert filter.
If you have read the beginning of this chapter, you are aware that there is no such thing as 100% balance, so there will be some current to ground. An example would be 115 V from line to ground, 230 line to line, 5% capacitor tolerance, 5 mA allowed to ground and 60 Hz. Note that if the capacitance is a limit specified by the customer and the customer simply takes a capacitor measurement from either line to the common ground, this method will not pass. If the current limit is specified, isolate the filter and load from ground and measure the green wire current, and this method will pass.
EMI Filter Design Second Edition Revised and Expanded (Electrical and Computer Engineering) by Richard Lee Ozenbaugh