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Super low power isolated MOSFET driver

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isolation barrier, which creates problems with conducted emissions and sus ceptibility to fast dV/dt transients on the switching node

n you need to trigger the FET, transmit the pulse through the transformer, impedance match, rectify and apply to the gate. With

Just for fun, see this paper about a coreless PCB transformer flyback conve rter with high efficiency:

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_Transformer

For a flyback core losses can be high, so using a converter without a core is not a bad way to tackle that problem

Cheers

Klaus

Reply to
Klaus Kragelund
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For megavolt systems, the Faraday cage for the control room can be located at the hot electrode. Other than bathroom break anxiety, no problems were reported.

Reply to
whit3rd

We use this one, rated for 4 kV:

It's intended for Ethernet but we use it to run a serial ADC for a floating measurement channel. Two sets of windings used in parallel for the power at a few hundred mW, and one each for the Tx and Rx data at about 100 kbps.

We buy them direct from the manufacturer, hopefully for a better price than the distributors are quoting above! This is going in a medical product and has to be UL listed, so it's still cheaper than paying the certification costs for a custom transformer.

modulation.

Reply to
RBlack

I'm using some ADUM7703s, each with a commercial dc/dc converter for the upside power. An FPGA gets the delta-sigma data and filters it for subsequent processing.

--

John Larkin         Highland Technology, Inc 

The cork popped merrily, and Lord Peter rose to his feet.  
"Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"
Reply to
jlarkin

Wow, that is truly crazy. I would never think that you can get more than

50% of a coreless inductive converter. Thanks a lot, Klaus!

Best regards, Piotr

Reply to
Piotr Wyderski

And that is just the flyback, which is a horrible topology

If you use a halfbridge resonant inverter driving a coreless transformer you can get a lot high efficiency

Cheers

Klaus

Reply to
Klaus Kragelund

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