In contrast to the traditional back-to-back 12-switch AC/DC/AC converter，the 9-switch converter exhibits its merits in lower manufacturing cost and smaller size by saving 25 percent switches.The sinusoidal pulse width modulation（PWM）schemes for the 9-switch converter including the dead-time free PWM method is described at length.Besides，a novel cross modulation strategy for the single-phase 6-switch converter is proposed，which can enhance the modulation depth significantly as seen from the simulation results presented.