Manju_Bhat

Hi Hero999 , thanks for your reply. But i am not allowed to use any auto transformers or any transformers in which size is the issue. and how to maintain 120V when the input is 85v ? though heaters works on RMS or DC , requiremnt is to cotrol the heaters through PWM with 120V AC excitation. So is there any way for this ? Can i get a topology for this ? Can you share some reference designs for this requirement . thanks manju

Hi Friends, I have an uinversal AC input , 85v to 265v . I need to design for constant 120v AC output supply for heater application. But i do not want to use Auto transfomrer , since i have a size constraint on my board/product. I was just thinking of using universal AC to PFC circuit , after that one full bridge inverter would suffice the requirement. But Converting AC to DC and again back to AC ..may create a lot of efficiency related issue. Is there any way of achieving this ? Can some body give me the circutry ? Input : Universal AC : 85V to 265V AC Output : 120V constant AC , with 2kw power delivery. please share me the schemtics if you have. thanks in advance. -Manju