In the control of a PWM inverter, there are various requirements such as decreasing a harmonic loss and acoustic noises, improving control response, optimizing switchings of the branches of the inverter in any condition, and simplification in circuit construction. In the present invention, the branches...http://www.google.se/patents/US4800478?utm_source=gb-gplus-sharePatent US4800478 - Method and apparatus for controlling PWM inverter
