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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Current drawn from mains supply posted by guyser on April 21, 2006 at 15:45:45:
When an amplifier is playing I can understand that the current draw (in most instances)will vary depending on how hard it is working. However do these increases in current only get drawn at the supply frequency ie 50 or 60 Hz or are there higher frequency elements to the current being drawn? Hope that makes some sense!Current drawn through the AC line in a capacitor input power supply is in the form of 100 or 120 Hz half sine pulses as the rectifiers turn on during the refresh cycle so yes, there will be harmonic components above 100 or 120 Hz.
Here's a good illustration of the various waveforms from Rod Elliot's website:
The first (DC Output Ripple) is the voltage across the reservoir capacitors. The second (Capacitor Ripple Current) is the current in the capacitors. The third (AC Current) is the current being drawn through the AC line. And finally the fourth (AC Volts) is the voltage across the AC line showing the flattening of the AC waveform about the peaks during the refrech cycle due to the non-zero source impedance of the AC line.
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Follow Ups
- Re: Current drawn from mains supply - Steve Eddy 20:46:04 04/22/06 (0)
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