Online Parameter Tuning Technique for Predictive Current-Mode Control Operating in Boundary Conduction Mode

The objective of this paper is to present an
online

parameter

tuning
technique for digital power converters with predictive peak current-mode control operating in boundary conduction mode. The issues caused by both
inductor

variation
and
input

voltage

drift
can be solved by the proposed online parameter tuning technique which is based upon the sampled currents between two pulsewidth modulation outputs. The proposed technique requires
neither
an additional sensor
nor
a system parameter. Furthermore, the effects of inductor variation and input voltage drift are analyzed. It will be demonstrated that the variation of the inductor and input voltage drift result in a dc offset of the inductor current and deteriorate the performance. It will be confirmed by experimental results that these effects can be coped with using the presented
online
parameter tuning technique. Experimental results derived from a field-programmable-gate-array-based digital controller will be presented to fully confirm the theoretical analysis.