regarding power line harmonics and switched vs linear--- The majority of linear power supplies are TR-packs followed by series regulators. TR is Transformer-Rectifier, which is a line-frequency transformer driving a capacitor-input filter. If the transformer were ideal then the primary current waveform would be identical to the rectifier-filter input used on most switchers. Since the circuits are essentially the same. the harmonics are the same. The solution however is much more difficult, since the boost-chop power factor correction solution nets out a 400+ VDC bus of little use to a linear.
Ferroresonance is another linear technique with an interesting collection of even harmonics, if I remember correctly. Bob Den Bleyker, [email protected], IBM at RTP
