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AN2459 Fiches technique(PDF) 9 Page - STMicroelectronics

No de pièce AN2459
Description  Digital Power Factor Correction for Tube Lamp Ballasts
PDF  35 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2459 Fiches technique(HTML) 9 Page - STMicroelectronics

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AN2459 - Application note
Power circuits design
9/35
Figure 5.
Input voltage & current measured on STEVAL-ILB002V1 (old EMI filter)
PF = 0.991 THD = 10.4%
Note:
Brown = Mains voltage, Blue = Input current.
Reference board design measurements of STEVAL-ILB002V1(Figure 5) show a THD value
of 10.4% and a PF value of 0.991. Between the manufacturing of the STEVAL-ILB002V1
reference design and publication of this application note, design work has continued and
some improvements have been made. For example, EMI filter parameters have been
changed from C-L-C to C-L filters, which give better results for waveform, power factor, and
THD .This optimized version is given in Figure 7 and result in the measured waveforms
shown in Figure 4 with THD = 10.3% and PF = 0.994.



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