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| Is here way to increase efficiency of wide input boost over 95% ? |
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| Miyuki:
Hi folks, for small solar project I need a DC/DC to feed common 120V DC bus I just want to confirm there is no better way of converting 24-100V input to this 120V Input current is up to 10A (as most panels use this Isc) I have proposed two phase boost and to reach reasonable efficiency I already have 28 mΩ mosfets and for theoretical 32V 8A input I can get up to 95% efficiency Is here any way or better topology to solve this wide input regulation, no insulation needed, to get few more percent without increasing price significantly ? |
| Vovk_Z:
I'm not sure but 95% is quite a good efficiency as for me. |
| madires:
You can try to optimize the switching frequency for the inductors (core and wire losses). Maybe it's possible to replace the diodes with some "ideal diode" controller plus MOSFETs. |
| Miyuki:
--- Quote from: madires on April 24, 2020, 01:41:56 pm ---You can try to optimize the switching frequency for the inductors (core and wire losses). Maybe it's possible to replace the diodes with some "ideal diode" controller plus MOSFETs. --- End quote --- Diodes have no much room for optimizing as I already have oversize schottky diode with Uf about 0.6, gate drive will consume more than are conductive loss now Inductors can have some room with adding copper and increase core gap, but it is just a fraction, now is in them about 2x 2.5W (about 1,5-2W core, rest is copper), so I dont think it worth Its more like to find other solution if is any or say it is best what can be done. |
| Vovk_Z:
--- Quote from: Miyuki ---Diodes have no much room for optimizing as I already have oversize schottky diode with Uf about 0.6, gate drive will consume more than are conductive loss now --- End quote --- - if it is so, then there is the same problem with power swich mosfets too? Do you have your power losses budget (for all parts)? |
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