An isolated two stage converter for LED lighting systems working with renewable energy

In this work, the design and development of a DC -DC Converter using a two stage buck-boost operation is discussed This converter is suitable for low power application such as a matrix LED lighting system The advantage of this converter lies in the fact that instead of using two controlled switches as in case of a conventional converter, this circuit uses one MOSFET as a switch. The circuit uses two inductors and two capacitors as energy transferring elements that are able to provide a good quality, high efficiency power supply to the load In this paper the design of TSBB converter is analyzed with closed loop control using a PI controller circuit. Even with smaller values of inductor and capacitor a highly efficient power supply can be made. The main feature of this circuit comparing with the circuits designed previously with the same concept is that, in this work a galvanic isolation between the load and the source is provided Thus by a suitable controller and galvanic isolation the ripple magnitude in the output is reduced considerably. A simulation model of the TSBB converter with results is presented.