• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

The same tired quesiton about rectification

Status
Not open for further replies.

Kal_B

Member
Hello everyone,


I don't know why I still don't get this maybe the formulas are too complicated.

I have 230VAC which I will connect to full wave rectifier, what would the output be without any filters or anything else connected.

I found answers ranging from 230 x 1.414 to 230 x 0.7 and many other formulas.


Thanks
Kal
 

Pommie

Well-Known Member
Most Helpful Member
Without a capacitor it will be 230V DC but very bumpy. The bumps will go from 0V to 230*1.414 - the peak voltage. With a capacitor, it will charge to the peak voltage - 230 * 1.414. The 1.414 is the square root of 2.

edit, the 0.707 you've encountered is one over root two and is how you convert the other way.

Mike.
 

Kal_B

Member
Thanks Mike.

To clarify, and please excuse my ignorance, the bumps will go from 0V to 325V that is DC with a ripple?

Thanks
Kal
 

crutschow

Well-Known Member
Most Helpful Member
o clarify, and please excuse my ignorance, the bumps will go from 0V to 325V that is DC with a ripple?
Yes, you have a 325V ripple.
The RMS value of this is still 230V.
The average DC value of this is 0.636 of the peak or 207V.
 

Kal_B

Member
What would the frequency of the ripple, does it relate to the frequency of the AC current rectified so if it's 60HZ then the ripple will be at the same rate?

Thanks
Kal
 

crutschow

Well-Known Member
Most Helpful Member
Here's a simulation to show the output from a full-wave rectified output for a 230Vac, 60Hz input (yellow trace).
Note that the output ripple is double the input frequency as Nigel noted, and that the average (DC) output is 204.75V and the RMS output is 227.4V (slightly less than I stated in post #4 due to the forward voltage drop loss of the diodes).

upload_2017-9-4_8-33-43.png
 

JonSea

Well-Known Member
Most Helpful Member
Here's a more conventional picture of a bridge rectifier circuit. It's easier to trace what happens when the sine wave is positive or negative.

SmartSelectImage_2017-09-04-09-26-28.png
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top