Mains Phase control with MOSFET’s

Nov 15, 2005 5 Replies
J

See...

PerfectDiodeForChargerIsolation.pdf

on the S.E.D/Schematics page of my website.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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I

I'm trying to figure out how to use 2 N-Channel power MOSFET?s for phase control without a bridge rectifier. (reducing diode power losses) A possibility is to use a a power diode in series with a N-channel MOSFET in parallel with a reverse diode with reverse N-channel mosfet. Does anyone here have an idea about a circuit for driving the second mosfet?



thx


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J

Connect the FET's sources together. One drain to the supply voltage. The other drain to the load. Drive the gates in parallel with respect to the sources.

Cheers, John

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J

Yeah, like that. Except I thought it might be good to drive the gates with respect to the source(s) rather than with respect to common.

But, yeah.

Thanks, Jim.

John

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M

How do i drive the gates if i connect the 2 sources togheter ? I would like to drive the gates with a microcontroller. How do you create a floating voltage?

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M

How do i drive the gates if i connect the 2 sources togheter ? I would like to drive the gates with a microcontroller. How do you create a floating voltage?

thx

Malic

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