Hello,
i design a PFC and use the ucc28180 as controller. My question is how can i improve the PF at low load?
i design a PFC and use the ucc28180 as controller. My question is how can i improve the PF at low load?
The Information About the design:
-V_in = 90-130VAC at 330-800Hz
-V_in_norm = 115 VAC at 400Hz
-V_out = 350V
-P_out = 105W
-f_sw = 250 kHz
-V_in = 90-130VAC at 330-800Hz
-V_in_norm = 115 VAC at 400Hz
-V_out = 350V
-P_out = 105W
-f_sw = 250 kHz
For the design i used the design calculator and implemented it on the UCC28180EVM-573 360W PFC Evaluation Board. I changed all parts so that the values of the design calculator are attune. The only different is the inductor-value. It is a little bit higher.
The Problem is, i measure a PF of 0.66 at 20W and a PF of 0.88 at 50W. This is to Little. So i search a solution to reach the PF at 50W of 0.95 and at 20W maybe higher as 0.85.
How can i improve the PF?
Best regards.
The Problem is, i measure a PF of 0.66 at 20W and a PF of 0.88 at 50W. This is to Little. So i search a solution to reach the PF at 50W of 0.95 and at 20W maybe higher as 0.85.
How can i improve the PF?
Best regards.
