摘要 |
<p>The method involves assigning half bridges of a pulse controlled inverter to each U, V, W phase of a three phase voltage system. Neutral voltage (Usp) corresponding to pulse-width modulation (PWM) of PWM control signals appears at a neutral point of the system. The bridges are controlled in a way of an unsymmetrical or symmetrical control such that either a 100 or a 0 percentages-control exists in one of the bridges for the phases.</p> |