Question

In a full bridge VSI, source voltage is 300 V, amplitude modulation ratio $\left(m_a\right)$ is 0.8 and frequency modulation ratio $\left(m_f\right)$ is 39. The fundamental frequency is 47Hz. The rms value of fundamental frequency output voltage is

Answer 1

Amplitude modulation ratio $\left(m_a\right)$
$=\frac{{\left(\widehat{V_{A0}}\right)}_h}{V_d/2}$
The rms value, $V_{01}=\frac{V_d}{\sqrt{2}}\frac{{\left(\widehat{V_{A0}}\right)}_h}{V_d/2}$
$=\frac{V_d}{\sqrt{2}}\times m_a=\frac{300}{\sqrt{2}}\times 0.8$
$V_{01}=169.70V$