Abstract
Now a days LEDs are replacing traditional incandescent and fluorescent lamp in domestic and commercial applications due to their advantages of high efficiency, low power consumption and long life. The ripple content of current in both sides is reduced and performance improvement is obtained by controlling the forward current of LED using isolated/non-isolated dc-dc converters. Even though cuk and sepic converters have continuous currents on input and output sides but there exists more current ripple content on input side higher than acceptable limits. A magnetically coupled CUK converter proposed to steer the current either to input side or output side hence can have a control on ripple content of current without additional filters. This paper also analyses the effect of magnetic coupling in CUK converter. PI controller is used to control the output current of the converter. MATLAB model for the LED is modelled and used for the simulation. This paper discusses the design and simulation results for a 48W coupled inductor cuk converter at a constant switching frequency of 30kHz.
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