TY - GEN

T1 - Δv/Δt-intervention control concept for improved transient response in digitally controlled boost converters

AU - Quenzer-Hohmuth, Samuel

AU - Ritzmann, Steffen

AU - Rosahl, Thoralf

AU - Wicht, Bernhard

N1 - Publisher Copyright: © 2018 IEEE. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2018

Y1 - 2018

N2 - Boost converters suffer from a bandwidth limitation caused by the right-half-plane zero (RHPZ), which occurs in the control-to-output transfer function. In contrast, there are many applications that require superior dynamic behavior. Further, size and cost of boost converter systems can be minimized by reduced voltage deviations and fast transient responses in case of large signal load transients. The key idea of the proposed ΔV/Δt-intervention control concept is to adapt the controller output to its new steady state value immediately after a load transient by prediction from known parameters. The concept is implemented in a digital control circuit, consisting of an ASIC in a 110nm-technology and a Xilinx Spartan-6 field programmable gate array (FPGA). In a boost converter with 3.5 V input voltage, 6.3 V output voltage, 1.2 A load, and 500 kHz switching frequency, the output voltage deviations are 2.8x smaller, scaling down the output capacitor value by the same factor. The recovery times are 2.4x shorter in case of large signal load transients with the proposed concept. The control is widely applicable, as it supports constant switching frequencies and allows for duty cycle and inductor current limitations. It also shows various advantages compared to conventional control and to selected adaptive control concepts.

AB - Boost converters suffer from a bandwidth limitation caused by the right-half-plane zero (RHPZ), which occurs in the control-to-output transfer function. In contrast, there are many applications that require superior dynamic behavior. Further, size and cost of boost converter systems can be minimized by reduced voltage deviations and fast transient responses in case of large signal load transients. The key idea of the proposed ΔV/Δt-intervention control concept is to adapt the controller output to its new steady state value immediately after a load transient by prediction from known parameters. The concept is implemented in a digital control circuit, consisting of an ASIC in a 110nm-technology and a Xilinx Spartan-6 field programmable gate array (FPGA). In a boost converter with 3.5 V input voltage, 6.3 V output voltage, 1.2 A load, and 500 kHz switching frequency, the output voltage deviations are 2.8x smaller, scaling down the output capacitor value by the same factor. The recovery times are 2.4x shorter in case of large signal load transients with the proposed concept. The control is widely applicable, as it supports constant switching frequencies and allows for duty cycle and inductor current limitations. It also shows various advantages compared to conventional control and to selected adaptive control concepts.

UR - http://www.scopus.com/inward/record.url?scp=85046968063&partnerID=8YFLogxK

U2 - 10.1109/APEC.2018.8341029

DO - 10.1109/APEC.2018.8341029

M3 - Conference contribution

AN - SCOPUS:85046968063

SN - 9781538611814

T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

SP - 316

EP - 322

BT - 2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018

Y2 - 4 March 2018 through 8 March 2018

ER -