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Results tagged with transformer
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user 3920
A transformer couples two or more AC signals through a magnetic field. Often used as galvanic isolation and to transform one AC voltage to another.
5
votes
1
answer
1k
views
Can I detect zero crossing on the transformer's secondary?
In this answer poster uses the rectified secondary's half sines to detect the zero crossings of the mains voltage. Can you do that? I thought there was a phase difference between primary and secondary …
- 9,788
17
votes
3
answers
33k
views
Difference between current transformers and power transformers
In a current transformer, the primary current causes a magnetic field in the core, which in turn generates a current in the secondary. Fine. … How come then that a power transformer outputs a voltage, and not a current? Isn't it the same principle? …
- 9,788
2
votes
What is a secondary transformer?
12 V secondary transformer must be read as "(12 V secondary) transformer". So the word "secondary" refers to the indicated voltage, not to the word transformer. … The peak voltage is \$\sqrt{2}\$ times higher than RMS, so a 12 V transformer will give 17 V peak. …
- 9,788
10
votes
3
answers
6k
views
How to dimension a power supply transformer?
I always hesitate when dimensioning a transformer for a DC power supply, and I guess I sometimes overdimension them. My confusion stems from the difference in transformer and DC voltage. … If I need 10V DC @ 1A, will a 10VA transformer do? My gut feeling says I need more, so I use a bigger transformer, but how much bigger does it have to be? …
- 9,788