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Power supply voltage dip protection design

i200yrs

Nov 1, 2016
4
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Nov 1, 2016
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Hello All...good day...I am new with this forum...Just want to ask from experts about the the attached circuit, what would be i consider if i increase the original capacitor from 10000uF to 33000uF? PowerProtectCkt2.JPG Thanks a lot.

PowerProtectCkt2.JPG PowerProtectCkt2.JPG PowerProtectCkt2.JPG
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
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Jan 21, 2010
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25,510
Probably very little.

It is possible that the resistor may get a little warmer, if it's not noticeably warm now, there's probably nothing to worry about.

Is the contactor rated for 33V?

Why not use a bridge rectifier and a large filter capacitor?
 

i200yrs

Nov 1, 2016
4
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Nov 1, 2016
Messages
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Thanks for the inputs...the caps rated 63V...that is actually the original design to hold for 1 sec power dip...But i want to increase it up to 3 sec power dip protection. So based on cap discharge formula (Vc=Voe(-t/RC). The 33000uF cap is very suitable....thanks
 

pgib8

Jul 26, 2015
107
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Jul 26, 2015
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107
I second the bridge rectifier. But wait, you didn't say what the problem was.
 

i200yrs

Nov 1, 2016
4
Joined
Nov 1, 2016
Messages
4
Hello...most of the power dip happens here at least 3sec....our system original design based on the schematic is can hold only 1 sec for the coil...so our system trips...so i am modifying the system to handle until 3 sec power dip. Thanks guys.
 
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