recommended topology for 1-2kW line SMPS?

mzzj · 2nd July 2005, 10:30 PM

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?

mflorin · 4th July 2005, 05:27 AM

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.

mzzj · 4th July 2005, 08:12 AM

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%

2nd July 2005, 10:30 PM	#1
mzzj diyAudio Member Join Date: Jul 2005 Location: 65N 25E	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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4th July 2005, 05:27 AM	#2
mflorin diyAudio Member Join Date: Jun 2005 Location: IASI	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.