Hello! First post, thanks for looking.
I have a couple of questions in the area of DC-DC converters, specifically buck style, and some crossover for maximum power point tracking in solar charge controllers.
1) Is the standard buck converter topology scalable for large (>50 amps) currents by just a suitable selection of components? I mean, are high current buck converters the same as low current buck converters, just bigger?
2) Solar MPPT. Everything I read about MPPT shows a single DC-DC conversion, but I can't figure out how that could allow for the impedence-matching necessary for MPPT. It seems to me that you would need two conversions: one for controlling the solar input and one for battery charging. I say this because batteries have different charge modes depending on their state of charge and I can't see how a single converter could give the batteries what they need while simultaneously altering the solar input side for tracking. It looks like a single converter would allow you to track the maximum power point, but then the output would not always be what a battery needs.
For example, a single converter could take 120 VDC from a solar array and convert it to 12 volts to charge a battery at 20 amps. So 240 watts going into the battery. How is the input side controlled to allow for MPPT?
Clear as mud questions I know. Thanks.
I have a couple of questions in the area of DC-DC converters, specifically buck style, and some crossover for maximum power point tracking in solar charge controllers.
1) Is the standard buck converter topology scalable for large (>50 amps) currents by just a suitable selection of components? I mean, are high current buck converters the same as low current buck converters, just bigger?
2) Solar MPPT. Everything I read about MPPT shows a single DC-DC conversion, but I can't figure out how that could allow for the impedence-matching necessary for MPPT. It seems to me that you would need two conversions: one for controlling the solar input and one for battery charging. I say this because batteries have different charge modes depending on their state of charge and I can't see how a single converter could give the batteries what they need while simultaneously altering the solar input side for tracking. It looks like a single converter would allow you to track the maximum power point, but then the output would not always be what a battery needs.
For example, a single converter could take 120 VDC from a solar array and convert it to 12 volts to charge a battery at 20 amps. So 240 watts going into the battery. How is the input side controlled to allow for MPPT?
Clear as mud questions I know. Thanks.