Analysis of power LED driving circuits, simulation comparisons and one application of isolated LED driver circuit

With the development of led technology, the control problems of power led drivers occurs in last years. For this reason, the development of LED driver circuits has been emphasized. Nowadays, they can be found as a simple led driver, constant current with mosfet led drivers, buck led drivers, boost led drivers, buck-boost led drivers and flyback led drivers. In this paper, all these led drivers which are simple topologies are drawn in a simulation program to work under equal output power. This equal output power means specified with same power. All results of these led drivers are compared for input and output current, input and output voltage, input and output power, efficiency, presence of power factor correction circuit, presence of isolation, power factors, operating frequency. In addition, efficiencies of isolated and non-isolated circuits were compared. As an application circuit, we proposed PAR230VEM flyback isolated circuit which has the highest performance. Also, we measured voltage and current of main mosfet and diode on secondary side. Then we have analyzed the waveforms. It is seen that, due to the working principle of flyback circuits, current and voltage stresses appear. Current and voltage suppression circuits should be added to have better efficiency. Snubber circuit components of main mosfet and diode on secondary side were calculated. After adding snubber circuits on main mosfet and diode on secondery side, we measured same points. Old and new results were compared. The changes were re-interpreted.