Phil_S wrote: ↑Mon Feb 03, 2020 6:32 pm...look at the Hammond rectifier sheet...
Any thoughts what is meant by
V (Avg) D.C. = 0.45 x Sec. V A.C.
?
For a sine wave three values are often referenced: peak, rms, and average.
VAC is in Vrms, so max rectified voltage in the limit (no rectifier voltage drop, no ripple) is Vpeak = sqrt 2 x Vrms.
Vavg is 2/pi times Vpeak, so Vavg is Vrms x 1.414 x 2/pi = Vrms x 0.9.
Since Hammond is referencing the entire winding Vrms, the above values are halved, and Vavg = 0.45 * Vrms.
martin manning wrote: ↑Tue Feb 04, 2020 8:32 pm...For a sine wave three values are often referenced: peak, rms, and average.
VAC is in Vrms, so max rectified voltage in the limit (no rectifier voltage drop, no ripple) is Vpeak = sqrt 2 x Vrms.
Vavg is 2/pi times Vpeak, so Vavg is Vrms x 1.414 x 2/pi = Vrms x 0.9.
Since Hammond is referencing the entire winding Vrms, the above values are halved, and Vavg = 0.45 * Vrms.
I can see that is the case if there wasn't a reservoir cap filling in the gaps between the full wave rectified ripples.
But with a cap I don't get it
Unless the cap is so undersized that at full load it may as well not be there.
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