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A COMPARATIVE STUDY ON PARALLELING SCHEMES OF CONVERTER MODULES FOR DISTRIBUTED POWER APPLICATIONS
Byungcho Choi,D.J.Kim,Bo H Cho 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Three different paralleling schemes for multi-module converters are investigated. For each paralleling scheme, benefits and limitations are addressed for distributed power applications, and guidelines for designing the feedback controller are presented. Results of the analysis are verified by both frequency- and time-domain simulations.
Byungcho Choi,Wonseok Lim,Seungwon Choi,Jian Sun Institute of Electrical and Electronics Engineers 2008 IEEE transactions on industrial electronics Vol.55 No.5
<P>Three different current-mode control schemes, peak current-mode control, charge control, and average current-mode control, are investigated for application to asymmetrically driven bridge-type pulsewidth modulated dc-to-dc converters. The principles, implementation, and performance of the three control schemes are compared in an attempt to identify their respective merits and limitations. Design considerations for feedback compensations are also given for the three control schemes. The theoretical predictions of this paper are supported by both experimental results and computer simulations.</P>
Analysis of Input Filter Interactions in Switching Power Converters
Choi, Byungcho,Kim, Dongsoo,Lee, Donggyu,Choi, Seungwon,Sun, Jian Institute of Electrical and Electronics Engineers 2007 IEEE transactions on power electronics Vol.22 No.2
<P>This paper presents the theoretical and practical details involved with the small-signal analysis of switching power converters under a strong influence of input filter interaction. A boost dc-to-dc converter controlled by voltage-mode control and the same boost converter controlled by current-mode control are used as illustrative examples. The theoretical predictions of this paper are supported by experimental results and computer simulations</P>
Wonseok Lim,Byungcho Choi,Honnyong Cha 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents the small-signal modeling and closed-loop analysis of the charge control adapted to asymmetrical half-bridge dc-to-dc converters. The merits and limitations of the charge control are investigated by comparing its performance with that of voltage mode control and peak-current mode control. Especially, a potential drawback of the charge control for low-voltage high-current applications is addressed. A 50W experimental asymmetrical half-bridge dc-to-dc converter was used to experimentally verify the theoretical results of the paper.
SMALL-SIGNAL MODEL FOR A CONTROLLED ON-TIME BOOST POWER FACTOR CORRECTION CIRCUIT
Yonghan Kang,Byungcho Choi 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
A new small-signal model for the controlled on-time boost power factor correction (PFC) circuit is presented. The proposed small-signal model is valid up to high frequencies over lkHz. The model can be used in designing the voltage feedback compensation of PFC circuits, the control bandwidth of which is maximized with auxiliary means of removing the low-frequency ripple from the output. The accuracy of the model is confirmed by a 200W experimental hardware.
Stability Analysis of PWM Converters Connected to General Load Subsystems
Syam Kumar Pidaparthy,Byungcho Choi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper investigates stability of dc-to-dc converters deriving another dc-to-dc converter through a filter stage. The impacts of the downstream filter/converter stage on the absolute and relative stabilities of the upstream converter are analyzed. The absolute stability is examined using the minor loop gain, defined as the ratio of the impedances seen at the output port of the upstream converter. The relative stability is assessed using the loop gain expression of the upstream converter. This paper reveals that the downstream filter/converter stage rarely destabilizes the upstream converter, but usually dictates the loop gain characteristics of the upstream converter and frequently determines the phase margin and 0 dB crossover frequency of the loop gain. This paper proposes a simple method to determine the stability margins of the converter from the minor loop gain. The theoretical predictions are supported by both small-signal simulations and experimental measurements.
Switched-Capacitor회로를 이용한 새로운 다출력 DC-DC 컨버터
여주용(Jooyong Yeo),최병조(Byungcho Choi),김흥근(Heuggun Kim),안태영(Taeyoung Ahn) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A new multiple-output dc-to-dc converter based on a switched capacitor circuit is proposed. The proposed converter offers multiple outputs that can be individually regulated by a direct output voltage feedback or indirect cross regulations. The performance of the new converter is demonstrated using a 10 W experimental converter that delivers 5V IlA output and 3.3V /IA output from a lO-15V input source.