I have a quick noob question about a PT I have. It's secondaries are labeled like this:
250V/100mA - 0V - 250V/100mA
I'm not certain what this means the current rating is. I'm guessing another way to show this is 500VCT/200mA, correct?
Or is it 500VCT / 100mA ?
TIA!
250V/100mA - 0V - 250V/100mA
I'm not certain what this means the current rating is. I'm guessing another way to show this is 500VCT/200mA, correct?
Or is it 500VCT / 100mA ?
TIA!
500VCT @ 100 mA. DC output capacity will be about 100 mA as well. DC current could be more with choke input, but voltage would be too low for most applications.
On the same subject, I never got this really clear.
If I for example have a 500VCT @100mA TX what can I expect it to handle if used for bridge rectification instead of the (I suppose) expected full wave rectification.
Can I actually pull 100mA @ 500V?
/Olof
If I for example have a 500VCT @100mA TX what can I expect it to handle if used for bridge rectification instead of the (I suppose) expected full wave rectification.
Can I actually pull 100mA @ 500V?
/Olof
No, you can't get 100 mA since you have to supply capacitor ripple current as well as dc current - 60-70 mA would be more like it. With choke input you could get 90 mA or so. Duncan Amps PSU designer can give a good idea of the RMS transformer current for a given DC current.
Hi there
Yes I am aware of this, it was late and I did not express myself very clear. I refered to actual AC current to be drawn from the secondary.
What I really wonder is; if a TX is spec'd at 500VCT@100mA, is this for use in a full wave circuit where you actually can draw approx 60-70 mA at 350VDC?
Or can it be used in a bridge circuit to supply 60-70mA @ 700VDC?
It is quite a difference.
/Olof
About 100 mA in a full-wave center-tap circuit, maybe 130 mA with choke input. About 60-70 mA at 700V in full-wave bridge. About 90 mA at 500V with FWB and choke input filter. Any of these result in about 100 mA RMS AC current in the transformer secondary.
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