Comparative analysis of FPGA-based digital pulse width modulation techniques for multiphase DC-DC converters
- Resource Type
- Conference
- Authors
- Tahir, Muqadsa; Walker, Geoffrey R.; Broadmeadow, Mark A. H.; Bulmer, Steven M.; Ledwich, Gerard F.
- Source
- 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) Power Electronics Conference (SPEC), IEEE Annual Southern. :1-6 Dec, 2016
- Subject
- Power, Energy and Industry Applications
Pulse width modulation
Clocks
Radiation detectors
Registers
Switching frequency
Switches
Signal resolution
- Language
This paper proposes the development of a new digital pulse width modulation (PWM) scheme for aplication to both single phase and multiphase voltage regulation modules (VRMs), which are used as processor power supplies. A comparative analysis of this novel phase accumulator based PWM generation technique is presented with the traditionally used counter based PWM approach for synchronous buck converter topologies. A simulation study of open loop systems of these digital techniques is carried out to demonstrate their feasibility and performance characteristics. For practical evaluation of these two techniques, experiments in single-phase and eight-phase 12 V to 1V buck converter controlled by an FPGA are performed by using the 16 bit phase accumulator and counter. The impact from the interleaving strategy is presented and peak-to-peak voltage ripple and output spectra are evaluated.