harimelath
Member level 2
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I came across a high power SMPS for battery charger application in a UPS recently which does not contain the heavy filter capacitors, instead has a good line filter with a series choke and a small capacitor of 1µF 275VDC value. The output is 110v @ 15Amps. The controller used is UC3843 with a unconventional feedback circuit which controls the voltage of pin 1 by a Opto isolator. The transformer is pretty big and i checked it to be EE55 from EPCOS.
Does anybody have an idea on how this is possible to operate high power levels at that cap value?
How is he transformer and other components designed and selected.
the regulation is very good and starts at 110V ac input and covers a range upto 275V Ac input. Mosfets selected are type 2SK2611 900V @ 9A.
Thanks
HMN
I came across a high power SMPS for battery charger application in a UPS recently which does not contain the heavy filter capacitors, instead has a good line filter with a series choke and a small capacitor of 1µF 275VDC value. The output is 110v @ 15Amps. The controller used is UC3843 with a unconventional feedback circuit which controls the voltage of pin 1 by a Opto isolator. The transformer is pretty big and i checked it to be EE55 from EPCOS.
Does anybody have an idea on how this is possible to operate high power levels at that cap value?
How is he transformer and other components designed and selected.
the regulation is very good and starts at 110V ac input and covers a range upto 275V Ac input. Mosfets selected are type 2SK2611 900V @ 9A.
Thanks
HMN