Abstract:
A single-phase series-resonant soft-switched ac chopper without auxiliary switches
with an efficient control circuit is presented. Basic working principle is series-resonant
conversion without any cycloconversion action. Auxiliary switches are absent in this
topology. The presented single-phase ac chopper is producing the resonant voltage
robes by the action of series resonator with the help of four bidirectional switches.
A series of sinusoidal amplitude quasi-sinusoidal pulses synthesized and present at
the output as purely sinusoidal waveform following the input voltage waveform. Fre
quency modulation with a constant-on time control technique is used in this proposed
system. Waveform syntheses for the output sinusoidal voltage are clearly explained
with waveforms. A typical design example of single-phase soft-switching ac chopper
is simulated to assess the system performance. The power efficiency is improved by
using soft switching techniques. The total harmonic distortion is well below 1 % .
MATLAB R 2010a version software is used to simulate the model.
