Open AccessDesign of Dual-Rate PIM-Disturbance Regulators for a DC-DC Switching Converter
Author(s) -
Naoya Nishinaga,
N. Hori,
Xinyue Ruan
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/646/1/012019
Subject(s) - control theory (sociology) , converters , pulse width modulation , voltage , capacitor , dual (grammatical number) , low dropout regulator , computer science , voltage regulator , engineering , dropout voltage , control (management) , electrical engineering , literature , artificial intelligence , art
Three types of dual-rate digital controllers are designed to suppress the output voltage fluctuations caused by load-current changes for a buck DC-DC switching converter running at 300kHz PWM. The slower-rate outer loop is designed using the IA-PIM method, which stabilizes the outer loop at a slow rate of 25kHz. Since the time lag in sensing the disturbance is critical, a faster loop of 300kHz is added based on three different approaches. The resulting dual-rate control laws are implemented on a single 16-bit fixed-point microcomputer with the clock frequency of 140MHz, via 12-bit A/D and D/A converters. Experiments on the fluctuation of the output voltage caused by load-current transients show that, while the analog regulator suppresses the maximum output fluctuation to be 4.7 % of the output voltage, one of the three digita l control methods achieves 4%, without adding ext ra analog components, such as capacitors as in our previous paper.