SLUAAY1 October   2024 UCC28064A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Interleaving PFC Principle of Operation
  6. 3Original PFC Design with Internal Line Feed-Forward block
  7. 4Current Phenomenon of Operating With UCC28064A Internal Line Feed Forward Function
  8. 5Achieving Adaptive Current Control PFC With UCC28064A
  9. 6Test Results Comparing Original PFC Design to Adaptive PFC Design
  10. 7Summary
  11. 8References

4 Current Phenomenon of Operating With UCC28064A Internal Line Feed Forward Function

Even though the line voltage feed-forward compensation is built-in, we wanted to implement an adaptive PFC design by configuring an external circuit to prevent the occurrence of a larger peak current than expected due to the slow response time of the PFC compensation block and the high current limit of the PFC block when line transitions from 90Vac to 264Vac and from 264Vac to 90Vac condition.

High Peak Current During 90Vac to 264Vac Line Transient Figure 4-1 High Peak Current During 90Vac to 264Vac Line Transient