The document describes the design and simulation of an open loop Cuk converter. The specifications include an input voltage of 70V, duty ratio of 0.7, switching frequency of 15kHz, voltage ripple of 5% across capacitors, and current ripple of 10% through inductors. The inductor values are calculated as 857uH and 2uH using the current ripple specification. The capacitor values are calculated as 65.32uF and 1.66uF using the voltage ripple specification. A simulation model of the Cuk converter is created based on the design values.

1. EE 560: Power Electronics Converter
Cuk Converter
Name : Akash Vishwakarma
Roll No. : 224102101 6th Spt. 2022
1 Objective:
Design an open loop Cuk converter and simulate it. The specifications for the converter are given
below: Input Voltage (Vin): 70 V; Duty Ratio (D): 0.7; Switching Frequency (fsw): 15 kHz; Voltage
Ripple across both Capacitors (∆Vo): 5%; Current Ripple through both Inductors (∆IL): 10%;
Load resistance (RL=10Ω).
2 Buck Boost Converter Design:
2.1 Filter inductor
• The inductor value is calculated using the given ripple in both inductor current as 10%:
L1 =
DVin
fs∆IL1
(1)
L2 =
DVin
fs∆IL2
(2)
• Therefore, the value of the inductor L1=857microHandL2 = 2microH.
2.2 Filter Capacitor
• The capacitor value is calculated using the given output voltage ripple as 5%:
C1 =
DIo
fs∆VC1
(3)
C2 =
∆Io
8fs∆VC2
(4)
• Therefore, the value of the capacitor C1 = 65.32microF and C2=1.66microF.
1

2. 2.3 Simulation model of Cuk Converter:
3 Waveforms and results:
2

3. 3