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Old 2nd July 2005, 10:30 PM   #1
mzzj is offline mzzj  Finland
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Question recommended topology for 1-2kW line SMPS?

As far as i know in this power class full-bridge and half-bridge are most popular ones, but does somebody have good alternatives or even better choices?

Some bizar Cuk-topology? (this is not going to be commercial product so patent problems are not an issue)
I have also seen 2-transistor forward converter(about 3kW) so maybe even that could be alternative? But I think that is rarely recommended for more than 500W? worse core utilization because of one-side flux swing?
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Old 4th July 2005, 05:27 AM   #2
mflorin is offline mflorin  Romania
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I saw a welding unit of about 6kW and was a two transistor forward converter topology. The frequency of the pwm was around 40kHz generated by a UC2845 and as a power switches four igbts was used (two in parallel).

The welding unit dosen't have a pfc unit in the front of forward converter. I think that if you don't care about the mains, the presence of a pfc unit is related to the final destination of the converter.

Anyway, a pfc unit could help, improving converter behavior.
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Old 4th July 2005, 08:12 AM   #3
mzzj is offline mzzj  Finland
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Default Re: recommended topology for 1-2kW line SMPS?

Quote:
Originally posted by mzzj
worse core utilization because of one-side flux swing? [/B]
after second tought, this shouldnt be a problem because nowadays smps are using so high frequency that core saturation is not a problem. (core loss limits flux swing)
Altought copper losses are bigger in forward converter because maximum duty cycle is 50%
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