Question

What is DC to DC converter? Explain 2 Quadrant ‘Class C’ Chopper with circuit diagram & waveforms.

Answer 1

Dc to dc converters, called choppers, are supplied from a dc voltage source, typically a diode rectifier and a dc link, as shown in Fig. 1.37. The dc link consists of a large capacitor connectedacross the input terminals of the chopper and, often but not necessarily, a series inductance. The capacitor smooths the dc voltage produced by the rectifier and serves as a source of the high-frequency ripple current drawn by the chopper. The inductor provides an extra screen for the supply power system against the high-frequency currents. All choppers are pulse width modulated, the phase control being infeasible with both the input and output voltages of the dc type.