Electrical – 160V capacitor for smoothing

powerpower supply

Will a 2200uf 160v capacitor be ok to smooth a 110v dc supply.
240 to 110 transformer to a bridge rectifier to load.
will it give me 110 volts or 160 volts output?
Many Thanks

Best Answer

The DC output of a bridge rectifier is √2 times the rms AC input, minus the diode drops. So for 110V in, you get 155V out. The capacitor needs to have a voltage rating larger than the voltage it's exposed to. 160V is larger than 155V, but it's cutting it close, especially as the ripple current in rectifiers is hard on capacitors. So I would suggest a higher rated one - for a long term reliable circuit, I'd go for double the output voltage, so 320V.