APPLICATION OF BIFURCATION THEORY TO CURRENT MODE CONTROLLED PARALLEL-CONNECTED BOOST DC-DC CONVERTERS

This project is to design a circuit which will guarantee stable operation at switching
frequencies, and any quasi-periodic or chaotic operation is regarded as being undesirable and
should be avoided. This project focuses in particular on the application of bifurcation theory
to parallel-input / parallel-output two-module current-programmed DC-DC converters.
Besides, this project describes the operation of Current Mode Controlled Parallel-Connected
Boost DC-DC Converters and basically defines chaos, bifurcation and quasi-periodic
distortion of the circuit by varying the reference current and comparing it with inductor
output current. Within specific ranges of reference current the circuit operates without any
distortion. The design includes the simulation of any bifurcation within the intended
operation range by using PSpice, Multisim and EWB software. The inductor current output
waveforms obtained and compared at different levels of reference currents. There are few
ways to improve the output waveforms such as connecting freewheeling diode with parallel
to inductor, using combination of triple input/triple output Current Mode Controlled
converter or just using parallel input/series output configuration. Parallel-input / paralleloutput
are the most common configuration that can be used in current mode control DC-DC
converters. Simulation and calculation results shows that capacitor voltage ripple factor
reduced from 30% to 3%(actual) and output current ripple from 20% to 3%. Improvement in
this type of converter will open up new applications in datacommunication,
telecommunication, power-supply in PC and inside the notebook, industrial automation and
so forth. The core of the project work focuses on simulating the entire process and later
building the prototype.