AN3276 datasheet(17/22 Pages) STMICROELECTRONICS

tên linh kiện	AN3276

Giải thích chi tiết về linh kiện	ST solution for efficiency improvement in PFC applications

PDF	22 Pages

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17 / 22 page

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.

100

150

200

250

300

350

400

450

BC² solution

8A SIC

Continuous mode

SiC

BC²

+1.7%

+1.5%

+1.2%

Fs = 140 kHz

= 90 V

mains

RMS

Efficiency = f(P

)

OUT

Efficiency=f(POUT,Fs)

203

400

POUT

BC² solution

72kHz

8A SIC

72kHz

BC² solution 144kHz

8A SIC

144kHz

BC² solution 200kHz

8A SIC

200kHz

72KHz

140KHz

140KHz 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=

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