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How do you generate unipolar sinusoidal pulse width modulation from a function generator?
Wiki User
∙ 14y ago
If you're going to use a function generator, presumably you'll be natural sampling a sinusoid for SPWM. In order to generate unipolar spwm, you'll need two sinusoids that are 180 degrees apart. So take the output of your sinusoid into two unity gain buffers, one inverting and one non-inverting. This will also allow you to set your reference for the sinusoids as compared to the (ONLY ONE!) sampling waveform, which can either be a triangle or a sawtooth. A sawtooth can easily be generated using a single comparator, by the way. One side of the bridge driven from the buffered sample ouptut and the other from the inverted and buffered sample output. It is my understanding that unipolar spwm has the advantage of higher order harmonics, as compared to bipolar, which makes them easier to filter out. The tradeoff is greater complexity because of the required extra input waveform. Good luck.
Wiki User
∙ 14y ago
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