PLECS 3.2 Online Help |
Generate PWM signal using sawtooth carrier
Control / Modulators
2-level PWM generator with a sawtooth carrier. The input m is the modulation index, and the output s is the switching function. If the modulation index is a vector the switching function is also a vector of the same width.
The block can be used to control the IGBT Converter or the ideal Converter. In these cases the modulation index must have a width of 3 to match the number of inverter legs.
The following figures illustrate different sampling methods offered by the modulator block. In the figure on the left, Natural Sampling is used. The right figure shows Regular Sampling, i.e. the modulation index is updated at the vertical flanks of the carrier. In both figures carrier signals with falling ramps are employed.