Abstract
This paper presents the use of a single-phase voltage-doubler Boost rectifier, to generate a controlled DC voltage, which is applied to a four-quadrant chopper. The transistor chopper controls the speed of a separately excited DC machine. The Boost rectifier permits the regeneration of energy from the motor to the single-phase mains, maintaining in all operating points a practically sinusoidal input current, with a THD of 2.5%. The balancing of the two filter capacitors is achieved by using and additional control loop. A low cost microcontroller is used to control the DC voltage and the motor speed.
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