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AN3276 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN3276
Description  ST solution for efficiency improvement in PFC applications
PDF  22 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3276 Datasheet(HTML) 17 Page - STMicroelectronics

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AN3276
BC2 design in 450 W PFC
Doc ID 17975 Rev 1
17/22
Figure 16.
Efficiency comparison at 90 V rms
Figure 17.
450 W PFC efficiency versus three different output powers and three
switching frequencies for Vmains rms = 90 V
Figure 17 highlights the benefit of the BC2 circuit soft switching method added to its COSS
discharge power saving especially at low load.
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90
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50
100
150
200
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400
450
%
BC² solution
8A SIC
Continuous mode
SiC
BC²
+1.7%
+1.5%
+1.2%
Fs = 140 kHz
V
= 90 V
mains
RMS
Efficiency = f(P
)
OUT
P
OUT
Efficiency=f(POUT,Fs)
80
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90
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52
203
400
POUT
%
BC² solution
72kHz
8A SIC
72kHz
BC² solution 144kHz
8A SIC
144kHz
BC² solution 200kHz
8A SIC
200kHz
72KHz
72KHz
72KHz
140KHz
140KHz 200KHz
200KHz
200KHz
140KHz
+0.7%
+1.7%
+2%
POUT=50W
POUT=200W
+0.5%
+1.5%
+1.6%
+0.4%
+1.2%
+1.5%
Efficiency=f(POUT,Fs)
POUT=400W
Vmains=90VRMS
FS=
FS=
FS=



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