Abstract
A digitally controlled PWM inverter, modulated by a multi-random technique with a single fixed switching frequency, is proposed for uninterruptible power supplies. Multi-random pulsewidth modulation utilises a random phase-shift PWM scheme and a random pulse position PWM scheme, both driven at the same switching frequency. The multi-random technique reduces harmonics intensity, and thus reduces undesirable acoustic noise and mechanical vibration. The control scheme is based on instantaneous feedback signals of output voltage and capacitor current. The output voltage is therefore well regulated during sudden load disturbance, as confirmed by simulation results. An experimental prototype was built. When compared with the conventional sinusoidal PWM scheme, experimental results show better spectrum performance, very fast dynamic response, and a great reduction of acoustic noise.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
