By Richard Lee Ozenbaugh
Supplying basic equipment of measuring AC and DC strength traces, this hugely well known, revised and accelerated reference describes the choice of cores, capacitors, mechanical shapes, and types for the timeliest layout, building, and trying out of filters. It provides analyses of matrices of varied clear out varieties in accordance with shut approximations, commentary, and trial and blunder. delivering easy parameters and methods for growing manufacturable, repeatable items, the second one version presents insights into the reason and removing of universal mode noise in traces and gear, explores new information on spike, pulse, trapezoid, and quasisquare waves, and stories the most recent high-current filters.
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Additional info for EMI Filter Design Second Edition Revised and Expanded (Electrical and Computer Engineering)
7 L1 50 pH -c2 1 . 2 5 uF FIG. 2 The proposed 461 LISN. 100 kHz (depends on the line length). This test method masks this flaw of the pi filter or the L filter with the capacitor facing the low impedance. 6 shows the method used by Robert Hassett at RFI. In the 461 specification, the current probes feed the measuring equipment to compare the two currents. This method shunts the input pi filter capacitor copying the real world up to the frequency where the 10-yF capacitor's SRF takes effect. This method makes the pi filter loss 12 dB per octave, 40 dB per decade, instead of 18 dB per octave, 60 dB per decade.
In common mode (covered later), all the input terminals are tied together, as are the output terminals, so the three are working in parallel. Here, the line-to-line capacitors do not help the common mode loss. A worse condition exists if the power line frequency also happens to be 400 Hz (see the preceding section). 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.
4 shows the isolated supply with the storage capacitor (SC), the switch (Ql), and the load resistor (Rl). Besides removing the common mode problem, the ground (green) wire has little current on it, referred to as leakage, or reactive, current. The EM1 filter in front of this supply can be balanced with the differential capacitors from line to line, not to the green ground line, and leakage current will be minimal. Only small capacitors to ground, feed-through style capacitors, with a common mode choke will handle the common mode problem if the system is working on the 120-V side.