Bridge Rectifier

[Steve Lewinsky]

Im a novice and trying to understand the logics here. My monitor has the
120v AC line coming into a Full bridge rectifier(4 Diode set) with 3 .01
filter caps. Why do I get 183volts DC out the other side and not 120volts
DC?
If a picture is required let me know

 

[JeffM]

Why do I get 183volts DC out the other side and not 120volts DC?
Steve Lewinsky

http://groups.google.com/groups?num=100&hl=en&lr=lang_en&ie=ISO-8859-1&safe=off&q=jeffm_+%22Peak+value%22&btnG=Google+Search

 

[Jimmy]

Typically the unloaded output voltage should be 1.414 * RMS input voltage in
your case 120 volts. Sounds like you have a little more than 120.

"Steve Lewinsky" <lewinsky0857@NO_DAMN_SPAMrogers.com> wrote in message
news:S8Pvb.2685$B04.759@twister01.bloor.is.net.cable.rogers.com...

Im a novice and trying to understand the logics here. My monitor has the
120v AC line coming into a Full bridge rectifier(4 Diode set) with 3 .01
filter caps. Why do I get 183volts DC out the other side and not 120volts
DC?
If a picture is required let me know

 

[scada]

"Steve Lewinsky" <lewinsky0857@NO_DAMN_SPAMrogers.com> wrote in message
news:S8Pvb.2685$B04.759@twister01.bloor.is.net.cable.rogers.com...

Im a novice and trying to understand the logics here. My monitor has the
120v AC line coming into a Full bridge rectifier(4 Diode set) with 3 .01
filter caps. Why do I get 183volts DC out the other side and not 120volts
DC?
If a picture is required let me know

The output of the bridge rectifier should go through some filtering that has
large electrolytic capacitors. The unloaded voltage would be 1.414 * RMS or
1.414 * 120 = ~170 VDC. The fact that you are reading 183 VDC shows that
there is no load on the power supply! Something has open circuited, causing
a no load condition.

 

[Jimmy]

"scada" <scadaxxxxx@optonlinenospam.net> wrote in message
news:gm8wb.18627$Hb.6601634@news4.srv.hcvlny.cv.net...

"Steve Lewinsky" <lewinsky0857@NO_DAMN_SPAMrogers.com> wrote in message
news:S8Pvb.2685$B04.759@twister01.bloor.is.net.cable.rogers.com...
Im a novice and trying to understand the logics here. My monitor has the
120v AC line coming into a Full bridge rectifier(4 Diode set) with 3 .01
filter caps. Why do I get 183volts DC out the other side and not
120volts
DC?
If a picture is required let me know



The output of the bridge rectifier should go through some filtering that
has
large electrolytic capacitors. The unloaded voltage would be 1.414 * RMS
or
1.414 * 120 = ~170 VDC. The fact that you are reading 183 VDC shows that
there is no load on the power supply! Something has open circuited,
causing
a no load condition.


The ~170 volts should be the open circuit voltage. 183vdc can only be

accounted for by the fact the input is more than 120 or measurements are
incorrect.