The step down converter
Christos C. Marouchos · Institution of Engineering and Technology eBooks · 2006
A simple circuit of a step down convertor is shown. The chopped voltage of a dc source is applied to a series inductor L and a parallel combination of a smoothing capacitor C and a resistor R. The resistor represents the power-consuming element of the load. The inductor has inductance L and ohmic resistance r. The switch is a MOSFET or an IGBT transistor. A control circuit, generates the gate pulses to switch on and off the transistor. The switch opens and closes at a fixed frequency. The duty-cycle of the switch determines the level of the output voltage. It is possible for this circuit to enter discontinuous conduction and the relevant mode is derived in this chapter. The analysis is restricted to continuous conduction only.