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Shengpeng Tang,Donglie Gu,Xianzhi Meng,Kexu Sun,Jianxiong Xi,Lenian He 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.6
A 3 MHz Si/ 5 MHz GaN-based 48 W boost converter with high speed and high accuracy Peak Current Control Unit (PCCU) is presented. Compared with the conventional Peak Current Mode (PCM) controllers, the boost controller IC adopts a novel PCCU consisting of a fully differential open-loop operational transconductance amplifier (OTA) and a transimpedance amplifier (TIA), which can minimize the feedforward delay and enable the converter to operate at a higher switching frequency. As a result, the dynamic response and peak current accuracy of the converter are improved. In addition, the compensated output of error amplifier in PCCU is moved forward to raise the control accuracy further. This IC is designed in CSMC 0.8 um 60 V BCD process. The post-layout simulation shows that the boost converter with the proposed PCCU can shorten the feedforward delay to 28.01 ns and behave much better than the conventional one in dynamic response as well as peak current accuracy. The proposed converter can operate at 3/5 MHz well with wide duty cycle ranging from 0.167 to 0.750. The maximum line regulation and output regulation is less than 9.6 mV/V and 6.72 mV/V, respectively.
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Jun-e Guo,Tian Li,Xianzhi Sun,Chengshu Zheng,Xia Sun 한국원예학회 2015 원예과학기술지 Vol.33 No.1
This study was carried out to investigate the relationship between endogenous polyamines (PAs) and floral bud differentiation in chrysanthemum (Chrysanthemum morifolium). In this study, PA content (free, bound, and conjugated) in apical buds, leaves, and roots changed appreciably during floral bud differentiation. PAs accumulated during series of processes such as floral induction, differentiation of floret primordia, and crown formation in apical buds; changes in PAs in apical buds may have a relationship with those in leaves and roots. The levels of free PAs and conjugated PAs [putrescine (Put) and spermine (Spm)] in apical buds rapidly increased during the initiation stage of floral bud differentiation, while free and conjugated spermidine (Spd) reached their highest levels at the stage of floret primordium differentiation. In the free, conjugated, and bound PA fractions, the changes in Spm content were negligible compared to those of Put and Spd throughout the experiment. These findings indicate that PAs participate in regulating the process of flower bud differentiation in chrysanthemum.
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Guo, Jun-E,Li, Tian,Sun, Xianzhi,Zheng, Chengshu,Sun, Xia Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.1
This study was carried out to investigate the relationship between endogenous polyamines (PAs) and floral bud differentiation in chrysanthemum (Chrysanthemum morifolium). In this study, PA content (free, bound, and conjugated) in apical buds, leaves, and roots changed appreciably during floral bud differentiation. PAs accumulated during series of processes such as floral induction, differentiation of floret primordia, and crown formation in apical buds; changes in PAs in apical buds may have a relationship with those in leaves and roots. The levels of free PAs and conjugated PAs [putrescine (Put) and spermine (Spm)] in apical buds rapidly increased during the initiation stage of floral bud differentiation, while free and conjugated spermidine (Spd) reached their highest levels at the stage of floret primordium differentiation. In the free, conjugated, and bound PA fractions, the changes in Spm content were negligible compared to those of Put and Spd throughout the experiment. These findings indicate that PAs participate in regulating the process of flower bud differentiation in chrysanthemum.
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