SMPS toroid transformer question - Page 2

Eva · 5th April 2006, 04:12 AM

I don't remember thoriated stating mains rated insulation as a requirement. Obviously, toroids are best suited for applications where such insulation is not required. If he requires such insulation, he may have to consider also E or ETD cores with layers of bifilar primaries interleaved with secondaries.

Implementing primary peak or average current control is another alternative that allows to use somewhar asymmetric primaries.

BTW: Tell us if you find any suitable supply of triple insulated wire.

thoriated · 6th April 2006, 02:13 AM

Thanks much for the responses. The input voltage range will be 16-40VDC, as I understand it. The need for isolation is not definitively established, but probably a good idea for the intended application. The multiple toroid approach Eva suggested is probably the most practical, although I am also interested in trying the planar approach.

The application would be as a brushless DC motor supply. (Another portion of the project would deal with actually controlling the motor.) I have designed a number of switching power supplies of various sorts, but nothing at nearly this high a power rating to date.

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5th April 2006, 04:12 AM	#11
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	I don't remember thoriated stating mains rated insulation as a requirement. Obviously, toroids are best suited for applications where such insulation is not required. If he requires such insulation, he may have to consider also E or ETD cores with layers of bifilar primaries interleaved with secondaries. Implementing primary peak or average current control is another alternative that allows to use somewhar asymmetric primaries. BTW: Tell us if you find any suitable supply of triple insulated wire.

6th April 2006, 02:13 AM	#12
thoriated diyAudio Member Join Date: Nov 2003 Location: flyover country	Thanks much for the responses. The input voltage range will be 16-40VDC, as I understand it. The need for isolation is not definitively established, but probably a good idea for the intended application. The multiple toroid approach Eva suggested is probably the most practical, although I am also interested in trying the planar approach. The application would be as a brushless DC motor supply. (Another portion of the project would deal with actually controlling the motor.) I have designed a number of switching power supplies of various sorts, but nothing at nearly this high a power rating to date.

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