Improvement of APWM Switching Function with Positive Saw-tooth Waveform for AC Choppers
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Abstract
In AC chopper circuits, the improvement of the input power factor is the Asymmetrical Pulse Width Modulation (APWM). The modulation signal of APWM has two conventional operation driving modes for ac chopper circuit. This paper presents the improvement of the APWM switching function with a positive saw-tooth waveform for AC choppers. Where the reference signal can be increased or decreased at and fixed at
. The developed method can also improve the carrier signal from the triangle signal to a positive saw-tooth signal and keep the trigger switching angle
constant throughout. The
and
results are performed by the Scilab and the Pspice computer simulation program. The comparisons to PWM and conventional APWM are also included.
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