I am living in an area where line voltage is 220V. If I have access to all 3 phases, is it possible to create a "socket" with output voltage of ~110V, without use of a transformer? This is primarily a thought experiment, rather than a project with definite scope.
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1\$\begingroup\$ "using only those phases and maybe some simple components as caps or inductors" You mean like a transformer? \$\endgroup\$– jippieCommented Jan 3, 2014 at 16:25
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\$\begingroup\$ Nope, the whole point is not to use a transformer. I have no idea if it's possible. I am thinking maybe something like shifting one of the input's phases so that the phase to phase voltage could be 110V. \$\endgroup\$– ReedCommented Jan 3, 2014 at 18:42
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\$\begingroup\$ What is the reason for not wanting to use a transformer? \$\endgroup\$– jippieCommented Jan 3, 2014 at 23:01
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\$\begingroup\$ A 2:1 autotransformer is the usual way of deriving a 110 VAC supply from 230VAC. Why do you seek a transformerless solution? (Is this a practical problem, or a thought experiment?) \$\endgroup\$– Li-aung YipCommented Jan 7, 2014 at 7:18
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\$\begingroup\$ A transformer is big and bulky. If it's possible to not use a transformer to do it it would be interesting. It's a thought experiment for now but if it's possible I would want to try it. \$\endgroup\$– ReedCommented Jan 8, 2014 at 11:12
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2 Answers
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Triac based light dimmers do this.
Varying the firing angle of the gate results in a reduced RMS output voltage. The output from this can be rectified and filtered however extreme caution should be exercised because the circuit has no galvanic isolation from the Neutral/Active lines and cannot be earth referenced if ELCB's are intalled.
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Have you checked all legs against neutral? Some 3 phase transformers tap so that two legs are 110v. http://en.wikipedia.org/wiki/High-leg_delta
answered Jan 3, 2014 at 17:53
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\$\begingroup\$ This doesn't answer the question, and should perhaps be a comment. \$\endgroup\$ Commented Jan 3, 2014 at 18:34