leo wrote:I have one concern though.
These UPSes, whether the Backup type or the SMART ones, have indications of current ratings on their output ports ranging from 2.5 to 3.5 amperes only.
Audio gears, most specially amplifiers, would often require more current. What would be the effect of this on such audio gears then? Would it be harmful to the equipment's circuitry?
You can calculate the amount of current your amplifier needs. For example,
Given:
amplifier output power = 10W per channel
input line voltage = 220V
Solution:
total output power = 10*2 = 20W
linear power supply efficiency = 50% (assumed typical)
power factor = 0.5 (assumed typical)
Efficiency = tot output power / (power factor x input power)
input power = tot output power / (power factor x Efficiency)
= 20/(.5 x .5) = 80watts
input power = input line voltage x input line current
input line current = input line voltage / input power
= 220/80 = 2.75A
Note: the linear power supply typically used in audio is really bad in terms of efficiency. So much converted to waste.
In a typical circuit, if the devices require 10A but only power supply can supply 8A or less, supply voltage (rail to rail) will go down. The power supply will try its best to give the 10A. When it does, supply voltage will go down (to maintain input power). As such, peak signal can easily reach supply voltage (since its lower) causing clipping. I don't know how this sounds as I haven't heard one yet but I guess sound will be bad.
Cheers,
Rascal101