| Abstract |
A non-uniformly connected single-phase rectifier with a novel constantly-sampled PWM scheme is
trially fabricated and experimentally examined, the ratings of which are a.c. 100 V input, d.c. 200 V
output, 1 kVA and a unity power factor. The applied PWM scheme ensures theoretically the
maximum error of the actual a.c. current to the reference one, zero-cross distortion free and the
minimum on-state and off-state time durations of main switches. Both high speed d.c. voltage
response and less distortion of the a.c. input current are achieved by the PWM scheme with applying
feedfoward control to the dc-AVR which functions as the upper stage of the PWM. 95% efficiency,
100% power factor and 2% a.c. current THD were measured. For full load shut-down, 1% and 20ms
were obtained for the transient d.c. overshoot voltage and the settling time although the topology is
unavailable for inverter operation. The rectifier demonstrated quick and excellent performance. |
