Magnetic circuit utilizing soft switching for LED driving
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LEDs are the most efficient way to turn an electric current into illumination. Connecting LEDs in either series or parallel is considered to be an option for better lighting and various other applications. Generally, when a large number of LEDs are considered, a parallel connection is opted. Connecting LEDs in parallel leads to current sharing problems as a result different currents flow in different branches. There are many ways in which current sharing problem in parallel connected LEDs can be solved. One such method is magnetic circuit wherein magnetically coupled inductors help resolve the current sharing problem. This thesis proposes a driver circuit for the magnetic circuit of LEDs.The LED driver is an electronic circuit that provides the LEDs with required power from the source. There are many sources of unneeded energy dissipation in the LED driver circuit. Inefficiencies in the inductors, such as eddy currents and winding resistance, are partially to blame. On the other hand, energy dissipation is primarily due to static and switching losses in the MOSFET. Static losses are due to the on resistance of the MOSFET, and can be decreased with specialty MOSFETs but never eliminated. When a MOSFET dissipates energy due to switching, it is said to be "hard switched". And thus it leads to energy losses. Hence, in order to increase the output and overall efficiency of the magnetic circuit of LEDs, soft switching is desired. This thesis proposed a soft switching circuit to decrease the switching losses and thus to increase the efficiency in the system.