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FAN9612 データシート(PDF) 3 Page - Fairchild Semiconductor

部品番号 FAN9612
部品情報  Design Consideration for Interleaved Boundary Conduction Mode PFC
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN9612 データシート(HTML) 3 Page - Fairchild Semiconductor

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AN-6086
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.4 • 4/22/10
3
Figure 4. Frequency Variation of BCM PFC
Since the design of filter and inductor for a BCM PFC
converter with variable switching frequency should be
done at minimum frequency condition, it is worthwhile to
examine how the minimum frequency of BCM PFC
converter changes with operating conditions.
Figure 5 shows the minimum switching frequency, which
occurs at the peak of line voltage, as a function of the RMS
line voltage for three output voltage settings. It is
interesting to note that, depending on where the output
voltage is set, the minimum switching frequency may occur
at the minimum or at the maximum line voltage. When the
output voltage is approximately 405V, the minimum
switching frequency is the same for both low line (85VAC)
and high line (265VAC).
Figure 5. Minimum Switching Frequency vs. RMS Line
Voltage (L = 390µH, POUT = 200W)
3. Interleaving of BCM Boost PFC
One important characteristic of a BCM boost converter is
the high ripple current of the boost inductor, which goes
from zero to a controlled peak value in every switching
period. Accordingly, the power switch is also stressed with
high peak currents. In addition, the high ripple current must
be filtered by an EMI filter to meet high-frequency noise
regulations enforced for equipment connected to the mains.
These effects usually limit the practical output power level
of the converter below 300W. However, operating two
parallel-connected boost power stages 180º out of phase, as
shown in Figure 6; the high peak current and over-sized
EMI filter problems are solved, extending the maximum
practical power level of this control technique to greater
than 800W. This technique is called interleaving.
Figure 6. Interleaving Operation of BCM Boost PFC
Interleaving operation provides many advantages over the
single BCM PFC operation. The losses are distributed in the
switching devices, which also spreads the dissipated power
and eases the thermal management of the power stage
design. Interleaving also yields great benefits on EMI filter
size reduction since the effective switching frequency seen at
the input side of the converter is doubled, while the
combined ripple current is minimized due to the ripple
current cancellation, as shown in the waveforms of Figure 6.


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