15-02-2017, 02:32 PM
The DC-DC converter is a converter where we are regulating the input voltage to obtain the desired output voltage that is greater or equal to or less than the input voltage with positive or negative polarity. A large number of dc-dc converters are available in the world of which SEPIC (single-ended primary inductor converter) converter is one of them. To analyse the converter, there are many techniques available. This work presents the use of MATLAB / SIMULINK to study the stability of the converter. The state space technique is applied to this higher-order converter and becomes a transfer function. The reduced order technique is applied to the system and compared to the higher order system which provides approximate results for all types of analyses. The DC-DC converter is a converter where we are regulating the input voltage to obtain the desired output voltage that is greater or equal to or less than the input voltage with positive or negative polarity. A large number of dc-dc converters are available in the world of which SEPIC (single-ended primary inductor converter) converter is one of them. To analyse the converter, there are many techniques available. This work presents the use of MATLAB / SIMULINK to study the stability of the converter. The state space technique is applied to this higher-order converter and becomes a transfer function. The reduced order technique is applied to the system and compared to the higher order system which provides approximate results for all types of analyses. A SEPIC cut-off current converter for high-brightness LEDs is presented. Due to the recent advancement in light emitting diode (LED) technology, the high brightness white LED is feasible in residential, industrial and commercial applications to replace incandescent bulbs, halogen bulbs and even compact fluorescent bulbs. In these off-line applications, high power factor and low harmonics are of paramount importance. A SEPIC converter is particularly suitable for non-insulated applications since it is single-stage, can rise or fall and high power factor when running in discontinuous conduction mode. A current feedback loop is proposed to control the brightness of the LED. This circuit has the advantages of a power conversion stage, no need to feel the input voltage, simple feedback control, and voltage step-up and down, high power factor and dimmable current LED.