Sir,

Please i am in need of sepic converter model for mtlb simulation, as i am finding it very difficult to implement in matlab. I am working on a project which uses sepic technology to reduce the torque ripple of bldc motor efficiently.

Regards,
Shubham

With these files it is possible to calculate and simulate a dollar, a boost or a buck-boost converter. There is a .m file with the design parameters (Init.m), that the parameters can be changed by the usser, and to simulate the converters this file must be executed previously. On the other hand, there is a matlab function with calculations (this file is called from Init.m).
Finally, there is a model of the three converters. It is possible to add a controller to the model or change the type of load (in the attached file it is considered a resistive load).

The single-ended primary inductor converter (SEPIC) is a type of DC / DC converter that allows the electrical potential (voltage) at its output to be greater than, less than or equal to its input. The output of the SEPIC is controlled by the duty cycle of the control transistor. A SEPIC is essentially a boost converter followed by a buck-boost drive converter, so it is similar to a traditional buck-boost converter, but has advantages of having a non-converter. (The output has the same polarity of Voltage than the input), using a series capacitor to couple the power from the input to the output (and therefore can respond more favorably to a short-circuit output), and be able to true off: When the switch is turned off , Its output falls to 0 V, following a rather strong transient dump of load.

SEPICs are useful in applications where a battery voltage may be above and below the intended output of the regulator. For example, a single lithium-ion battery typically discharges from 4.2 volts to 3 volts; If other components require 3.3 volts then the SEPIC would be effective.