Two Switch forward Converter



CASPOC Schematic

Components

Input voltage Vin = 380V
Expected output voltage Vout = 48V
Two Mosfet switched by at 50% duty cycle.
in this topology we have a transformer which we can use to stepup or step down the voltage. we also introduice isolation by
having different grounds from the between the primary and the secondary windings. as we can see the forward converter has the
topology of a Buck converter.
Diode D4 and D3 are used to prevent the transformer from saturation

Questions and remarks

It is assumed :
forward Converter operates in the steady state
forward Converter operates in continuous conduction mode
Mosfet voltage rating will be 380V as compared to using a single switchj forward converter
SCOPE 1:
Dark blue gragh ---> represents the Voltage output
Red gragh ---> current measurement across the Inductor
both the ripple voltage and current through the inductor are less than 1V

SCOPE 2:
Represents the current across the capacitor
We notice that the Iac current goes through the Capacitor.


SCOPE1:




SCOPE2:




Component Parameters


Components / Circuit:V111=380, R1=5, L1=22uH R=100m, D5=Diode , C1=220u, R2=100m , D6=Diode , D21=Diode, DMOSFET1111=MOSFET , D4=Diode, D3=Diode, D11=Diode, C211=10pF, DMOSFET121=MOSFET Components / Block:Components / Library:V21[sensor\voltage\v2.lib](Gain=1)
GROUND1[electric\ground\ground.lib]
P1S1111[powerconverters\smps\coupledinductor\ideal\p1s1.lib](Rp=1m, LpLeakage=1u, Lm=10m, Ns1=10, Np=38, Rs1=1m, Ls1leakage=1u)
CONSTANTPWM111[powerconverters\smps\pwm\constantpwm.lib](Phase[Deg]=0, d=0.5, Fs=100k)

Circuit information

File name = forward2tr.csi
Tscreen = 2m
Integration stepsize = 100n
Number of blocks = 25
Number of circuit nodes + voltage sources = 13

General information


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