Bridge Rectifier Problem.......!!!!!!!
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||||||||||||||
|
Posted by jo.jo on August 22, 2006, 6:17 am
Please log in for more thread options I am trying to construct a small desktop power supply and have noticed a small problem when measuring the output voltage from my bridge rectifier. The rectifier is constructed from four 1N4001. When i apply a AC wave (sin) to the input and measure the output, using a oscilloscope, the bridge rectifier seems to produce only halfwave rectification. I was expecting full wave rectification. Can anyone suggest what i am doing wrong ? | |||||||||||||||||||||||||
|
Posted by Eeyore on August 22, 2006, 7:25 am
Please log in for more thread options "jo.jo" wrote: Not enough info sadly. Is there anywhere you can post a schematic showing what you did? Graham | |||||||||||||||||||||||||
|
Posted by Stanislaw Flatto on August 22, 2006, 9:08 am
Please log in for more thread options
jo.jo wrote: > I am trying to construct a small desktop power supply and have noticed
> a small problem when measuring the output voltage from my bridge > rectifier. The rectifier is constructed from four 1N4001. When i > apply a AC wave (sin) to the input and measure the output, using a > oscilloscope, the bridge rectifier seems to produce only halfwave > rectification. I was expecting full wave rectification. Can anyone > suggest what i am doing wrong ? > Can you be more specific. Do you see half sinusoic signals of the same polarity and twice the frequency of input? Or you see half sinusoic signals with the period of input and missing equal periods between them? If the first then you have correct "full wave rectification". What did you expect? HTH Stanislaw | |||||||||||||||||||||||||
|
Posted by jo.jo on August 22, 2006, 9:52 am
Please log in for more thread options
Stanislaw Flatto wrote: > jo.jo wrote:
> > I am trying to construct a small desktop power supply and have noticed
> > a small problem when measuring the output voltage from my bridge > > rectifier. The rectifier is constructed from four 1N4001. When i > > apply a AC wave (sin) to the input and measure the output, using a > > oscilloscope, the bridge rectifier seems to produce only halfwave > > rectification. I was expecting full wave rectification. Can anyone > > suggest what i am doing wrong ? > > >
> Can you be more specific. > Do you see half sinusoic signals of the same polarity and twice the > frequency of input? > Or you see half sinusoic signals with the period of input and missing > equal periods between them? > > If the first then you have correct "full wave rectification". What did > you expect? > > HTH > > Stanislaw the output signal from my rectifier consists of positive half of a sin wave and then a flat line ( 0v more or less ) and is the same frequency as the input. a bridge rectifer essentially takes a sine wave and inverts the negative half, hence the frequency doubles. this inverted negative half is what i am missing from my output. i bread boarded the rectifier ( made from four 1n4001 ) and applied a sin wave from a signal generator to the input and measured the output on a oscilloscope. the output from the rectifier seems to be missing the inverted negative half cycle. i thought mayby it has something to do with the way the oscilloscope and signal generator ground there signals or i am simply using the equipment wrong. however i am sure that i have set everthing up correctly i am using 15V at 50 Hz to test the bridge rectifier and the amplitude of the output ( for the posistive half of the input ) is consistant with the conversion from rms to peak values and the losses you would expect in the diodes. | |||||||||||||||||||||||||
|
Posted by petrus bitbyter on August 22, 2006, 10:45 am
Please log in for more thread options
>
> Stanislaw Flatto wrote: >> jo.jo wrote:
>> > I am trying to construct a small desktop power supply and have noticed
>> > a small problem when measuring the output voltage from my bridge >> > rectifier. The rectifier is constructed from four 1N4001. When i >> > apply a AC wave (sin) to the input and measure the output, using a >> > oscilloscope, the bridge rectifier seems to produce only halfwave >> > rectification. I was expecting full wave rectification. Can anyone >> > suggest what i am doing wrong ? >> > >>
>> Can you be more specific. >> Do you see half sinusoic signals of the same polarity and twice the >> frequency of input? >> Or you see half sinusoic signals with the period of input and missing >> equal periods between them? >> >> If the first then you have correct "full wave rectification". What did >> you expect? >> >> HTH >> >> Stanislaw >
> the output signal from my rectifier consists of positive half of a sin > wave and then a flat line ( 0v more or less ) and is the same frequency > as the input. a bridge rectifer essentially takes a sine wave and > inverts the negative half, hence the frequency doubles. this inverted > negative half is what i am missing from my output. > > i bread boarded the rectifier ( made from four 1n4001 ) and applied a > sin wave from a signal generator to the input and measured the output > on a oscilloscope. the output from the rectifier seems to be missing > the inverted negative half cycle. > > i thought mayby it has something to do with the way the oscilloscope > and signal generator ground there signals or i am simply using the > equipment wrong. however i am sure that i have set everthing up > correctly > > i am using 15V at 50 Hz to test the bridge rectifier and the amplitude > of the output ( for the posistive half of the input ) is consistant > with the conversion from rms to peak values and the losses you would > expect in the diodes. > Suppose the output of your signal generator and the input of your oscilloscope share a common ground. petrus bitbyter | |||||||||||||||||||||||||
| Similar Threads | Posted |
| Bridge Rectifier Problem.......!!!!!!! | August 22, 2006, 6:17 am |
| Weird problem in Full wave (FW) bridge rectifier | November 21, 2007, 11:48 am |
| six pulse bridge rectifier | December 9, 2007, 9:22 am |
| information about bridge rectifier | July 3, 2008, 6:52 am |
| Can I use 4 scr's as a ordinary rectifier bridge ? | February 16, 2008, 2:28 pm |
| LTspice / SwitcherCAD III and Bridge Rectifier question | March 16, 2005, 7:02 pm |
| Voltage concerns on a bridge rectifier-capacitor circuit | August 15, 2007, 2:19 am |
| Full wave bridge rectifier circuit recommendations needed | April 1, 2008, 10:34 pm |
| Wheatstone bridge problem | June 6, 2005, 4:34 am |
| A little h-bridge help? | May 29, 2006, 11:07 am |
| H-bridge with Pic | November 4, 2006, 6:50 pm |
| H-bridge | January 18, 2007, 11:44 am |
| H-Bridge Contoller | January 9, 2006, 8:38 am |
| testing H-bridge | November 11, 2006, 1:49 pm |
| building an H-bridge | June 26, 2007, 6:42 pm |
> a small problem when measuring the output voltage from my bridge
> rectifier. The rectifier is constructed from four 1N4001. When i
> apply a AC wave (sin) to the input and measure the output, using a
> oscilloscope, the bridge rectifier seems to produce only halfwave
> rectification. I was expecting full wave rectification. Can anyone
> suggest what i am doing wrong ?