cupoftea
Advanced Member level 6
Hi,
We took apart a 3kW EV battery charger.
Half bridge LLC transformer was PQ3535 with AL = 1600, 3C90 ferrite.
LP=640uH
np/ns = 1:2
Fsw = 100khz
Vin=400vdc
Vout = 250-420VDC.......PFC output volts could be varied up to 445VDC (AC input was 85-265VAC).
Switching frequency was always 100kHz, apart from some times when it was 200kHz...(but when 200khz, the LLC gate drives were each on only 25% duty, instead of the usual ~49%)
PQ3535 was gap padded to metal case top, which in turn gets screwed to heatsink, which i believe is water cooled.
Also, vertical metal heatsinks are gap padded to the PQ3535 sides.
Do you believe this +/-260mT could be gotten away with due to all the cooling used?
We took apart a 3kW EV battery charger.
Half bridge LLC transformer was PQ3535 with AL = 1600, 3C90 ferrite.
LP=640uH
np/ns = 1:2
Fsw = 100khz
Vin=400vdc
Vout = 250-420VDC.......PFC output volts could be varied up to 445VDC (AC input was 85-265VAC).
Switching frequency was always 100kHz, apart from some times when it was 200kHz...(but when 200khz, the LLC gate drives were each on only 25% duty, instead of the usual ~49%)
PQ3535 was gap padded to metal case top, which in turn gets screwed to heatsink, which i believe is water cooled.
Also, vertical metal heatsinks are gap padded to the PQ3535 sides.
Do you believe this +/-260mT could be gotten away with due to all the cooling used?