Abstract
In this paper, we analyze a simple, yet effective nonlinear digital control approach -- gain scheduling of the A/D converter, in PWM converters to achieve system stability and improved dynamic performance. It is shown that a nonlinear gain scheduling could be conveniently realized and implemented, e.g. right after the A/D converter in digital controlled PWM converters. Several simple gain scheduling schemes are analyzed with describing function method, and associated gains are derived and provided. Experimental results on a FPGA system showed that the Buck converter transient response could be improved via nonlinear gain scheduling method. However, in Boost and Buck-Boost converters, it is necessary to make proper controller adjustment (pole and zero) so that the system stability is guaranteed not only with normal gain, but also with reduced gain.
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