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Old 11th June 2009, 12:21 PM   #1
EUVL is offline EUVL  Europe
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Default SMPS to Pure Sine

I remember the Mark Levinson ML33 using its own sine generator to "purify" the mains voltage before rectifying.

Has anyone tried that?

How about a switching mode PSU, driving a high power Class D amp (Hypex or what not), using a low-distortion sine oscillator as input, and then connect the ouput of the Class D amp to rectifiers and caps of a "linear" PSU ?

And one doesn't have to stick to 50Hz or 60Hz either.

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Old 11th June 2009, 12:40 PM   #2
Eva is offline Eva  Spain
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The "conceptually optimum" approach would be to use a PFC converter to get quasi-regulated DC from AC with sinusoidal current consumption and then use a DC-DC converter with appropriate outputs.

Why so much effort in producing a clean sine wave if you are immediately going to rectify and chop it resulting in plenty of harmonics?
I use to feel like the small child in The Emperor's New Clothes tale
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Old 11th June 2009, 04:24 PM   #3
star882 is offline star882  United States
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And resonant DC/DC converters will give a surprisingly sinusoidal waveform.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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