PWM and modulation notes

Blog Electrical Modulation total 2 posts

Space-vector hexagon showing the SPWM linear circle, the larger SVPWM and THIPWM inscribed circle, and a six-step vertex. Simulated diagram.

Why SVPWM Gives About 15% More Voltage Than SPWM, and Why the Number Changes With Your Definition

Relationships of DC line voltage, three-phase 6-step wave output, SPWM output and SVPWM output. Assuming `$$V_\mathrm{dc}$$` is DC voltage.

By Aris, 5 yearsDecember 27, 2021 ago

Modulation

The modulation index of pulse width modulation (PWM)

For the three-phase PWM inverter, there are three commonly used coefficients to indicate the DC voltage utilization level, i.e. Modulation Level (调制度) M = \cfrac{V_R}{V_T} where V_R is the magnitude (note, not fundamental amplitude) of modulation wave, V_T is the magnitude of carrier wave. When M \leq 1, there is Read more about The modulation index of pulse width modulation (PWM)

By Aris, 7 yearsNovember 7, 2019 ago

Modulation

Pulse-width and space-vector modulation, DC-bus utilization, and related calculations.

Why SVPWM Gives About 15% More Voltage Than SPWM, and Why the Number Changes With Your Definition

The modulation index of pulse width modulation (PWM)