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UCC28070A: iTHD偏高

Part Number: UCC28070A

开发一款3HP PFC的控制器,用于风机,输入功率约2.6KW,目前想用TIUCC28070A来设计的,开关频率65k,母线400V,下面是我们的测试数据:

UCC28070A方案(TI

输入电压(V)

输入电流(A

输入功率(W)

PF(%)

ITHD(%)

223.94

2.3138

499

99.597

25.455

222.763

4.6045

1005.4

99.9

18.804

221.598

6.8889

1507.6

99.955

15.027

219.477

9.4767

2062.5

99.977

12.324

219.193

11.5437

2514.3

99.984

10.656

217.971

12.0806

2618

99.987

10.18

目前有个问题,iTHD偏高,我们想满载降低到5%以下,是否有可行性方案?谢谢。