The type of rectification and filter topology will determine the output voltage and current. You can use the following guide to determine the voltage you need at the input and output of the transformer for your design or when you order your transformers.
Assumptions:
- V.AC is in RMS.
- RMS ripple current in filter capacitor is >2-3x the DC load current.
- Diode voltage drop is not included.
- Diode requirement
- Full wave, per diode average current is 0.5 of I.dc.
- Half waive, per diode average current is 1.0 of I.dc.
- 2x the current amount is recommended to take turn-on surge into consideration.
- Full wave, reverse voltage rating is >=1.4 x V.AC.
- Half wave, reverse voltage rating is >=2.8 x V.AC.
Half Wave Capacitor Input
- Vdc = 1.41 x Secondary V.AC
- Idc = 0.28 x Seconday I.AC
Full Wave Capacitor Input (V.AC = total of center-tap winding)
- Vdc = 0.71 x Secondary V.AC
- Idc = 1.00 x Secondary I.AC
- Vdc = 0.45 x Secondary V.AC
- Idc = 1.54 x Secondary I.AC
Full Wave Bridge Capacitor Input
- Vdc = 1.41 x Secondary V.AC
- Idc = 0.62 x Secondary I.AC
Full Wave Bridge Choke Input
- Vdc = 0.9 x Secondary V.AC
- Idc = 0.94 x Secondary I.AC
Now you know what capacity to get when you order your transformers! Don't spend unnecessary money on over-sized transformer that does not good but harm sometimes due to over-voltage!
J&K Audio Design
27/12/2013
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