Hello All,
Can someone with more experience assist with these two questions please?
I understand the need for inrush current limiting on the primary side of a toroidal transformer when >=500VA. It can be achieved in many ways, although I've chosen to go with some series resistors and a relay that bypasses them after around 200ms. The first question is what is happening on the secondary in terms of current and voltage during the 200ms inrush phase?
I've read on the forum about reservoir capacitor slow charge, for when the total uF on each power amp rail is high and when discharged the capacitors provide a short circuit to the transformer secondary. Slowing the charge rate to under the max ripple current capacity can be achieved again, by a resistor that is bypassed by a relay. The second question is I can't find people on the forum actually using capacitor slow charge, therefore, is this essentially achieved by the primary side inrush current limiting or a separate problem?
Thanks,
Ian
Can someone with more experience assist with these two questions please?
I understand the need for inrush current limiting on the primary side of a toroidal transformer when >=500VA. It can be achieved in many ways, although I've chosen to go with some series resistors and a relay that bypasses them after around 200ms. The first question is what is happening on the secondary in terms of current and voltage during the 200ms inrush phase?
I've read on the forum about reservoir capacitor slow charge, for when the total uF on each power amp rail is high and when discharged the capacitors provide a short circuit to the transformer secondary. Slowing the charge rate to under the max ripple current capacity can be achieved again, by a resistor that is bypassed by a relay. The second question is I can't find people on the forum actually using capacitor slow charge, therefore, is this essentially achieved by the primary side inrush current limiting or a separate problem?
Thanks,
Ian