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A High-Power Step-up Converter with High Efficiency and Fast Control-to-Output Dynamics
Jeong-il Kang,Chung-Wook Roh,Gun-WooㅡMoon,Myung-joong Youn 전력전자학회 2001 JOURNAL OF POWER ELECTRONICS Vol.1 No.2
A new high-power step-up based on the two-module parallel-input/senes-output (PISO) modular dual inductor-fed push-pull converter is proposed The proposed converter is operated at a constant duty cycle and employs an auxiliary circuit to control the output voltage with a phase-shift between two modules It shows a high efficiency due to the greatly reduced switch turn-off stress It also shows a high and linear voltage conversion ratio, low current stress in the output capacitor, and fast control-to-output dynamics The operation principles and the mathematical models of the proposed converter are presented. Features of the proposed converter are discussed in comparison with the two-module PISO modular dual inductor-fed push-pull converter Also, experimental results from a 50kHz, 800W, 350Vdc prototype with an input voltage range of 20 - 32Vdc are provided to confirm the validity of the proposed converter The new converter compares favorably with the conventional counterpart, and is considered well suited to high-power step-up applications.
Moon, Gun-Woo The Korean Institute of Electrical Engineers 1998 Journal of Electrical Engineering and Information Vol.3 No.3
A high efficiency interleaved active clamp forward converter with self driven synchronous rectifiers for a modular power processor is presented. To simplify the gate drive circuits, N-P MOSFETs coupled active clamp method is used. An efficiency about 90% for the load range of 50-100% is achieved. The details of design for the power stage and current mode control circuit are provided, and also some experimental results are given.
Gun-Woo Moon,In-Cheol Baik,Kyeong-Hwa Kim,Jun-Young Lee,Myung-Joong Youn 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The operation, efficiency, and reliability of two topologies are compared for a modular power processor. To simplify the gate drive circuits, N-P MOSFETs coupled active clamp method is newly proposed. An efficiency above 89% for the 50-100% load range is achieved. This paper provides design details for the power stage and the current-mode control circuit of an interleaved active clamp ZVS forward converter.
Modeling and Improved Predictive Current Control for Buck-Boost Series Resonant Inverter
Moon, Gun-Woo,Lee, Jung-Hoon,Baik, In-Cheol,Kim, Kyeong-Hwa,Youn, Myung-Joong The Korean Institute of Electrical Engineers 1996 Journal of Electrical Engineering and Information Vol.1 No.1
An improved predictive current control technique for a zero current switched(ZCS) buck-boost series resonant inverter(SRI) is proposed to overcome the inherent disadvantages such as the uncontrollable large overshoot and the large current ripple. Using the proposed technique, four quadrant operations of the output voltage and current for an uninterrutible power supply(URS) application are guaranteed and the buck-boost operation can also be obtained without an additional bidirectional switch.
Moon-Young Kim,Jong-Woo Kim,Chol-Ho Kim,Shin-Young Cho,Gun-Woo Moon 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In the lithium-ion batteries for electric vehicle applications, the charge equalizer is required to enhance life time and guarantee safety. For efficient charge equalization, a cell voltage sensing module should be used. However, the cost of the sensing module is relatively high. Thus, to achieve higher equalization performance without the cell voltage sensing module, a new automatic charge equalizer based on regulated voltage source is proposed. A fast regulated voltage source with average voltage of the batteries is implemented by a bidirectional dc-dc converter. The charge equalization can be automatically achieved by periodic connections between battery cells and regulated voltage source without the sensing module. The high equalization performance can be obtained by proposed reference voltage modulation and advanced skip mode. The operational principles and design considerations of the proposed equalizer are presented and equalization performance is verified by the prototype with 7Ah lithium-ion batteries.