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Old 15th April 2013, 01:56 PM   #91
AndrewT is offline AndrewT  Scotland
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It is a question resulting from my observation.
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Old 15th April 2013, 02:18 PM   #92
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The PV will take care off that .

Cheers ,

Rens
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Old 16th April 2013, 03:56 PM   #93
Bonsai is offline Bonsai  Taiwan
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Hello dhalbakken,

No, I have not tried that. Thanks for sharing your results.
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Old 16th April 2013, 11:37 PM   #94
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Thank you to everyone who posted ideas and schematics. I have located some VOM1271 that I can import into my country without excessive expense. I'll give the VOM1271 a go.
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Old 1st July 2014, 05:48 AM   #95
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Quote:
Originally Posted by PaulBysouth View Post
The relatively new Vishay VOM1271 opto-photovoltaic device seems to be the best device to use for driving a pair of mosfet relay switches. It includes a fast turn off circuit. The opto LED needs to be driven between 10mA and 20mA for best results.

See attachment for the mosfet relay concept, and the vom1271 datasheet at http://www.vishay.com/docs/83469/vom1271t.pdf

Note that I haven't tried this circuit yet, though I have bought the bits.

Paul Bysouth
Hi Paul ,

Just interested if your relay works

Cheers ,

Rens
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Old 4th July 2014, 01:18 PM   #96
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Rens,
No I haven't built the mosfet relay yet! I've spent most of the year working on a 1000 watt class D subwoofer, so no time for my projects.

If anybody wants to use LTspice to simulate the vom1271 optovoltaic, I use either of the two following `simple' models below.

Some time ago (3 years ago I think), I built a number of prototype 250 watt power amps that used `mosfet relays' in the power rails. These used large FQA32n20c mosfets driven by a rather complex opto coupler based drive circuit, and where situated after the power supply Capacitors and fuse, and before 2*47uF caps on the power amp. If either fuse opened, then both `relays' opened and disconnected both power rails. Experiments with pulling a fuse out while the amp was working (a bit scary when you have +-70v rails) did not produce any audible thumps - the test signal just stopped!

Regards,
Paul Bysouth
Attached Images
File Type: jpg VOM1271-switch-model.jpg (229.8 KB, 73 views)
File Type: jpg VOM1271-opto-model.jpg (177.1 KB, 73 views)
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