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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://cybre.space/users/niconiconi/statuses/108656792547937174">niconiconi (niconiconi@cybre.space)'s status on Sunday, 07-Aug-2022 16:25:36 JST</a><a href="https://cybre.space/@niconiconi" title="niconiconi@cybre.space"><img src="https://gnusocial.jp/avatar/1903-48-20220726102800.webp" width="48" height="48" alt="niconiconi" style="position: absolute; left: 0; top: 0;">niconiconi</a><div><a href="https://cybre.space/@niconiconi/108640512385384240" rel="in-reply-to">in reply to</a></div></section><article><p>Just found the full design equations for the 8/20 µs surge generator in [1]. The author was nice enough even to have all component values precalculated for you. Looks easy if you can find a suitable HV switch. I initially worried about core saturation, the surge is 100 to 1000 amps, but the L is just 10 µH, a practical value for winding an air-core coil by hand.</p><p>[1] Elementary and Ideal Equivalent Circuit Model of the 1,2/50 – 8/20 μs Combination Wave Generator, Carlo F. M. Carobbi <a href="https://ieeexplore.ieee.org/document/6714698" rel="nofollow noreferrer">https://ieeexplore.ieee.org/document/6714698</a>  <a href="https://cybre.space/tags/electronics" rel="tag">#electronics</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/37771#notice-56416">In conversation</a><time datetime="2022-08-07T16:25:36+09:00" title="Sunday, 07-Aug-2022 16:25:36 JST">Sunday, 07-Aug-2022 16:25:36 JST</time> <span>from <span><a href="https://cybre.space/@niconiconi/108656792547937174" rel="external" title="Sent from cybre.space via ActivityPub">cybre.space</a></span></span><a href="https://cybre.space/@niconiconi/108656792547937174">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/22139">A power supply, charging a 5.93 μF capacitor. After the switch is closed, the high-voltage surge is discharge via a 10.9 μH inductor and 0.814 Ω series resistance to the load. Before and after the inductor, there's also a 20.2 Ω and 26.1 Ω resistors to control the surge duration.</a></label><br><a href="https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/656/760/225/785/343/original/a424e3b594744594.png" rel="external">https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/656/760/225/785/343/original/a424e3b594744594.png</a></li><li><article><header><div>Domain not in remote thumbnail source whitelist: ieeexplore.ieee.org</div><h5><a href="https://ieeexplore.ieee.org/document/6714698">Elementary and ideal equivalent circuit model of the 1, 2/50-8/20 μs combination wave generator</a></h5><div></div></header><div>The values of the parameters of the equivalent circuit model of the combination wave (surge) generator, which appears in the standard IEC 61000-4-5, are here derived so that open-circuit voltage and short-circuit current exactly meet the standard waveform requirements in terms of peak amplitude, front-time and duration. The time-domain expressions of the voltage and current waveforms are obtained in closed-form. The new verification procedure set in the draft edition 3 of the standard, that involves the use of an 18 μF capacitor, is discussed, and the aspects relevant to the design of the generator are analyzed.</div><footer></footer></article></li></ol></footer></blockquote>

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niconiconi (niconiconi@cybre.space)'s status on Sunday, 07-Aug-2022 16:25:36 JST niconiconi
in reply to
Just found the full design equations for the 8/20 µs surge generator in [1]. The author was nice enough even to have all component values precalculated for you. Looks easy if you can find a suitable HV switch. I initially worried about core saturation, the surge is 100 to 1000 amps, but the L is just 10 µH, a practical value for winding an air-core coil by hand.
[1] Elementary and Ideal Equivalent Circuit Model of the 1,2/50 – 8/20 μs Combination Wave Generator, Carlo F. M. Carobbi https://ieeexplore.ieee.org/document/6714698 #electronics
In conversationSunday, 07-Aug-2022 16:25:36 JST from cybre.spacepermalink
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1. A power supply, charging a 5.93 μF capacitor. After the switch is closed, the high-voltage surge is discharge via a 10.9 μH inductor and 0.814 Ω series resistance to the load. Before and after the inductor, there's also a 20.2 Ω and 26.1 Ω resistors to control the surge duration.
  https://cybre.ams3.digitaloceanspaces.com/media_attachments/files/108/656/760/225/785/343/original/a424e3b594744594.png
2. Domain not in remote thumbnail source whitelist: ieeexplore.ieee.org
  Elementary and ideal equivalent circuit model of the 1, 2/50-8/20 μs combination wave generator
  The values of the parameters of the equivalent circuit model of the combination wave (surge) generator, which appears in the standard IEC 61000-4-5, are here derived so that open-circuit voltage and short-circuit current exactly meet the standard waveform requirements in terms of peak amplitude, front-time and duration. The time-domain expressions of the voltage and current waveforms are obtained in closed-form. The new verification procedure set in the draft edition 3 of the standard, that involves the use of an 18 μF capacitor, is discussed, and the aspects relevant to the design of the generator are analyzed.

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