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5 kW two-channel interleaved CCM PFC EVAL board
IKW40N65WR5, IDW60C65D1 and 1ED44175 in high frequency PFC application
The board at a glance
1
The board at a glance
This section of the UG-2021-06 describes the basic concepts about interleaved PFC and a brief introduction about
the design of EVAL-PFC5KIKWWR5SYS board.
1.1
Interleaved PFC
The standard boost converter is the most popular topology for power factor correction due to a simple control
of the input current while keeping the output voltage constant. For medium power levels, increasing the output
power and improving overall efficiency leads to the use of several converters in a parallel connection, such as
two channles or three channels connected in parallel. Furthermore, if the switches operate at two-channel
connection with 180° out of phase or three-channel connection with 120° out of phase, the interleaved operation
shares the same load capacitors and reduces input current ripple significantl. It also eases the burden of filtering
conducted EMI noise and helps reduce the EMI filter and CIN sizes.
This approach has several other benefits, such as ease of implementation, the use of more, but smaller
components and better heat distribution. Simultaneously, the output capacitor current ripple is also decreased
and evenly distributed in eachchannel, which can extend the life of the capacitors, help to reduce its size and
cost. Compared to a single boost converter, the inductors in interleaved PFC handle only half or one-third of the
current, inductors with much lower inductance values can reach the same high power, and lower inductance
means smaller inductors and higher power density for a given power rating.
Figure 1 is an example of two-channel interleaved PFC. Its detailed operation principles and key waveforms are
shown in Figure 2.
Iin
Figure 1
Block diagram of two-channel interleaved PFC
User guide
IL1
IL2
IQ1
5 of 41
ID1
ID2
IQ2
Ic
Iout
v1.0
2021-03-05
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