ABSTRACT
The d.c. chopper is a d.c. to d.c. PEC with forced commutation. It is used for armature voltage control in d.c. brush motor drives. D.c. sources to supply d.c. choppers are batteries or diode rectifiers with output filters so typical for urban electric transportation systems or to low-power d.c. brush motor drives. Thyristors, bipolar power transistors, MOSFETs, or IGBTs are used in d.c. choppers.
