R
reggie
- Jan 1, 1970
- 0
Hi all,
I have just been reviewing some magnetic stuff and come across some
discrepancies in dot notation between different documents.
I have sketched out a diagram as it is probably too hard to describe,
it’s a small JPG file so don’t worry there are no virus issues in
downloading this file.
http://www.adrive.com/public/5040381aef1a269de9465a441db0e5f92b0d4fc6e747d7fa93d0fcaf3c71e8dd.html
Fig1 and fig 2 are the same electrically but I have just moved the
secondary round the core to see it in my minds eye.
What I am confused about is fig4s current direction in relation to the
dots (I know its open circuit but assume it’s terminated) compared to
the forward converter (fig5)
I reckon the transformer is the same and connected in the same way, if
this is the case then why when the current moves from 1 to 2 on both
figures 4&5 primary’s, does the current in the forward converters
secondary move in the opposite direction from that of the standard
transformer?
I know current can only flow from pin 4 to pin3 in the forward
converter due to the top diode blocking current flow in the opposite
direction. I also know that pin 3 will be positive and thus forward
bias the top diode, what is really bothering me is the secondary
current direction found in multiple textbooks describing transformers.
I was wondering if there was some good information on the web about
dot notation relating to transformer physical construction, or can
someone please explain the discrepancies between current directions.
(I am assuming conventional current flow from +ve to -ve).
I know its basic, but its something I want to clear up,
Thanks,
Reggie.
I have just been reviewing some magnetic stuff and come across some
discrepancies in dot notation between different documents.
I have sketched out a diagram as it is probably too hard to describe,
it’s a small JPG file so don’t worry there are no virus issues in
downloading this file.
http://www.adrive.com/public/5040381aef1a269de9465a441db0e5f92b0d4fc6e747d7fa93d0fcaf3c71e8dd.html
Fig1 and fig 2 are the same electrically but I have just moved the
secondary round the core to see it in my minds eye.
What I am confused about is fig4s current direction in relation to the
dots (I know its open circuit but assume it’s terminated) compared to
the forward converter (fig5)
I reckon the transformer is the same and connected in the same way, if
this is the case then why when the current moves from 1 to 2 on both
figures 4&5 primary’s, does the current in the forward converters
secondary move in the opposite direction from that of the standard
transformer?
I know current can only flow from pin 4 to pin3 in the forward
converter due to the top diode blocking current flow in the opposite
direction. I also know that pin 3 will be positive and thus forward
bias the top diode, what is really bothering me is the secondary
current direction found in multiple textbooks describing transformers.
I was wondering if there was some good information on the web about
dot notation relating to transformer physical construction, or can
someone please explain the discrepancies between current directions.
(I am assuming conventional current flow from +ve to -ve).
I know its basic, but its something I want to clear up,
Thanks,
Reggie.