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I want to build a 12 pulse rectifier circuit. I know delta-wye or wye-delta transformers can be used to add phase shifts equal to the multiples of 30, but I don't want to use transformers. Is there another way to generate the needed phase shift?

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  • \$\begingroup\$ Out of curiosity, why do you want to avoid transformers? Cost? Size? Just to see if you can? \$\endgroup\$ May 28, 2014 at 13:55
  • \$\begingroup\$ size is the major issue, there's already a transformer in the circuit following the rectifier but it's a high frequency and single phase transformer so it's smaller in size,, If i use transformers in the rectifier they would be low frequency(50Hz), 3-phase and probably 2 in number, which demands a huge volume, \$\endgroup\$ May 28, 2014 at 14:01
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    \$\begingroup\$ At this point I'm more asking for curiosity than anything, but why use a twelve-pulse rectifier at those power levels? I understand the goal of a twelve-pulse is to reduce the harmonics and capacitor ripple. Are those a problem for you as low as 1.8 kVA? \$\endgroup\$ May 28, 2014 at 14:17
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    \$\begingroup\$ Actually I'm going with 6-pulse bridge rectifier but I was curious if there's another way to achieve phase shifts without transformers, \$\endgroup\$ May 28, 2014 at 14:21
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    \$\begingroup\$ In this sort of application, why wouldn't you use a modern 3-phase PFC (power factor correction) circuit? \$\endgroup\$
    – Dave Tweed
    May 28, 2014 at 15:55

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