Pchoke Pfe Pcu
Pchoke 13.593 W
Inductance calculation:
L_0A
μ0 μi 2 Ae N
2
le
L_0A 230.552 μH
Inductance versus DC bias:
He
N Iin_maxRMS 2
le
He 20.278 Oe
The toroid core Permeability at 170 Oersted is decreased to 40% of 0 Oersted.
μi_bias 0.4 μi
L20A_bias 0.4 L_0A
L20A_bias 92.221 μH
Bmax He μ0 μi 0.4
Bmax 0.049 T
Ripple current of PFC choke:
Δripple
2
Vin_min
L20A_bias fs
Dmin
Δripple 14.246 A
γ_max
Δripple
Iin_maxRMS
γ_max 6.256
MOSFET selection
In PFC circuit, the voltage stress of switches is equal to Vpfc. Considering voltage
stress derating of 0.8, we select infineon SPW20N60C3(TO-247 package,two pieces in
parallel) whose parameters is as below.
VDS 600V ID 20A RDS_on 0.22Ω
Iin_max t( ) Iin_maxRMS 2 sin ωpt()
交流输入电流的瞬时值
The current RMS of switches is calculated:
Idmos_max t( ) Iin_max t( ) DminIN t()
MOSFET电流的瞬时值
MOSFET电流的有效值
Ids_maxRMS
0s
0.01s
tIdmos_max t()
2
d
0.01s()
Ids_maxRMS 1.965 A
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