Shane,
Did you get a chance to take a look at the photos of the disassembled
coffee maker that Craig put in his Google Drive? The easiest-to-access
feed of power to the fan motor is *AC*, not DC -- there is a discrete
bridge rectifier soldered directly to the motor terminals.
I think a simpler, easier approach would be to use an optocoupled triac
on the AC "upstream" of the bridge rectifier. Then there is no need to
get in between the bridge rectifier and the motor (which would be
something of a headache).
My $0.02,
-Brian
On 1/2/20 4:55 PM, Shane Trent via TriEmbed wrote:
Craig,
I was actually talking about the voltage rating of the optoisolator used
to drive the FET gate. The image below more fully describes what I
meant. I expect your final circuit for the fan would include most of the
items shown below (I am not sure that you would need D2).
image.png
https://electronics.stackexchange.com/questions/67663/criteria-behind-selecting-pwm-frequency-for-speed-control-of-a-dc-motor
Shane
On Thu, Jan 2, 2020 at 8:10 AM Craig Cook via TriEmbed
<[email protected] <mailto:[email protected]>> wrote:
> The 4N25 is a common choice but is rated for use up to only 30
volts while the HCPL-181 looks to be around the same price and is
rated for up to 80 volts.
Oh, I am actually using one of these
https://cdn.sparkfun.com/datasheets/Components/General/FQP30N06L.pdf
(32A, 60V). I was lazy doing to schema diagram. It's been updated
again now. I think I have the diode in the correct place and direction.
Thanks
Craig
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