| Author |
Message |
ankireddy03
Joined: 13 Oct 2009
Posts: 6
Location: hyderabad
|
 23 Oct 2009 12:58 Rectifier design |
|
|
|
|
Hello sir,
I am designing 220V,4Amp DC supply using full bridge rectifier. I am using auto transformer after that isolation transformer to get variable DC voltage at output. I kept two 470uf capacitors as filter. but for 123V rms input i am getting 155V DC voltage as output. How it is possible for a low voltage ac , getting high voltage dc.
How to decide the filter capacitor value. Please help me.
|
|
| Back to top |
|
 |
ravimarcus
Joined: 09 May 2005
Posts: 204
Helped: 19
Location: Bangalore, INDIA
|
23 Oct 2009 13:23 Re: Rectifier design |
|
|
|
|
| ankireddy03 wrote: |
Hello sir,
I am designing 220V,4Amp DC supply using full bridge rectifier. I am using auto transformer after that isolation transformer to get variable DC voltage at output. I kept two 470uf capacitors as filter. but for 123V rms input i am getting 155V DC voltage as output. How it is possible for a low voltage ac , getting high voltage dc.
How to decide the filter capacitor value. Please help me. |
DC = (AC x 1.4) - 1.2 (diode drop, can be ignored for large voltages).
So the DC voltage will be higher for a given AC voltage.
Now regarding the capacitor value, keep about 1000 uF / Amp.
Cheers
Ravi
|
|
| Back to top |
|
|
Google
AdSense
|
23 Oct 2009 13:23 Ads |
|
|
|
|
|
|
| Back to top |
|
|
ankireddy03
Joined: 13 Oct 2009
Posts: 6
Location: hyderabad
|
27 Oct 2009 5:07 Re: Rectifier design |
|
|
|
|
what is the value of AC? Is it peak value or rms value?
Added after 2 minutes:
what is the meaning of AC, is it peak value or rms value?
|
|
| Back to top |
|
|
