Abstract
This letter presents a linearization technique for multisampled pulsewidth modulators (MSPWMs) employed in digitally controlled dc-dc converters. MSPWMs, i.e., PWMs operated at a sampling rate strictly higher than the switching frequency, greatly reduce the significant small-signal phase lag exhibited by conventional single-sampled PWMs, thus enabling for high-bandwidth design. On the other hand, the increased sampling frequency generates nonlinear phenomena known as sampling-induced dead bands, which represent zero differential gain regions in the modulator transcharacteristic that degrade the system closed-loop operation. This letter proposes a correction algorithm that allows for dead band removal, thus linearizing the PWM behavior, while still retaining the multisampling benefits. This result is achieved by a simple solution that can be easily implemented with simple hardware requirements. Simulation and experimental results on a dc-dc synchronous buck converter are provided to show the effectiveness and overall simplicity of the proposed solution.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.