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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, 287 views)
File Type: jpg VOM1271-opto-model.jpg (177.1 KB, 284 views)
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Old 26th February 2015, 11:17 AM   #97
Vlado70 is offline Vlado70  Slovakia
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To output this works well, tested, you could not also be used to switch input, if it was overshadowed by against interference?
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Old 23rd July 2015, 06:07 PM   #98
sajti is offline sajti  Hungary
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I'm thinking to use MOSFET relay in my next PA amplifier. It's running +/-85V, and can drive 2ohms load as well.
My idea to use ASSR-V621 driver and IRFB4127 MOSFETs. My only question if the MOSFETs are strong enough (200V 76A) in case of DC failure...

Sajti
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Old 23rd July 2015, 07:37 PM   #99
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You have fuse on the rail?

I have SS relay at the output of my OPS board. I use TK72A12N1 120V, 4.5mohm max. almost 5 times lower than the one you choose. I even parallel two SS relay to get the total resistance of 4.5mohm max.
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Old 24th July 2015, 06:00 AM   #100
sajti is offline sajti  Hungary
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As I'm still working on the amplifier, there is no problem to put or not put fuses...

Your mosfets looks Nice, however 120V is not enough to me. And 4127 has quite low on resistance, with small package, and moderate price.

My second possibility to use triac crowbar instead of relay.

Sajti
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