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- 저자 : Songrong Wu (검색결과 2 건)
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Stability Analysis of External Ramp Compensation on Valley V² Controlled Boost Converter
Haoyang Gan,Shengzhong He,Xiaoqiong He,Songrong Wu,Ping Yang,Minrui Leng 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
V² control has fast transient response so it has been widely used voltage regulator modules. Although valley V² control has been proposed to control boost converter, there still exist instability issues. To stabilize instability caused by small duty or equivalent series resistance of output capacitor, external ramp compensation has been used. However, there is no reference for choosing proper ramp slope. In this paper, a discrete iterative model of valley V² controlled boost converter with external ramp compensation is established. Based on the model, bifurcation behaviors under different duty cycle and ESR are observed as equivalent ramp slope increases. The orbit of converter transfers from chaos to multi-period then to period-1, consistent with maximal Lyapunov exponent. By analyzing loci of eigenvalues, stability boundaries in different operation regions are obtained to guide equivalent ramp slope design. Experimental prototype is also built up to verify the theoretical analysis.
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Current Controlled with Valley Voltage Detection Three-port Converter with Current-Pulsed Load
Zeyu. Zhu,Ping. Yang,Chaorui Liu,Songrong Wu,Wensheng Song,Jianping Xu,Xiaohui Qu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In small power supply systems such as aircraft and ships, some loads present the characteristics of current pulse. After the pulse load is directly connected to the power supply bus, the instantaneous power of its load presents the pulse characteristic as the load current. In order to balance the difference of instantaneous power, this paper proposes a bi-directional converter to compensate for the current fluctuation caused by the pulse load characteristic, which makes the power supply bus in the state of constant voltage and constant current, and solves the problem of adaptability of pulse load and power supply. In the meanwhile, a current feedback control method with valley voltage loop is proposed to control the bi-directional converter, which is also applicable when there is any change in frequency or duty cycle of the pulse load, even the constant power load. Finally, an experimental prototype is built to verify the correctness of the theoretical analysis.
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