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RISS 인기검색어
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- 저자 : Shengpeng Tang (검색결과 3 건)
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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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A Power-compensated and Dimmable AC Direct LED Driver with High Efficiency
Donglie Gu,Shengpeng Tang,Kexu Sun,Jianxiong Xi,Lenian He 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.6
A dimmable and power-compensated AC direct LED driver for lighting application is presented. A Source-Coupled Pair (SCP) is adopted to realize the soft self-commutating. To maximize the power efficiency, a multi-dimensional optimization method is applied for finding the optimum number of LEDs in each string. Moreover, error analysis for efficiency is introduced to evaluate the impact of circuit mismatches on efficiency. The driver includes a Power Compensation module which enables the LEDs power approximately constant under various AC line voltages. In addition, a low frequency pulse-width modulation (LFPWM) dimming technique is designed to regulate the LED’s brightness. The LED driver IC is designed and implemented in CSMC 700 V 1 um BCD process. The post-layout simulation results show that the system can achieve a high efficiency of 90.2% under typical condition and 220 V|rms, meanwhile realize dimming with a 90% duty cycle, 10 kHz dimming signal. With the proposed compensation scheme, the output power only changes less than 5% under 20% variation in input voltage.
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Chen Chun,Liu ShengPeng,Cao Yijia,Tang Liangxing,Li Yong 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
Because the distribution networks distribute electric energy to customers, has many equipment, a wide range and complex network structure, various failures are prone to occur. Rapid failure self-healing is the key means to improve the reliability of power supply in distribution network. This paper proposes a method for fast service restoration of out-of-service areas without failures based on peer-to-peer (P2P) communication of intelligent terminals. It uses distributed intelligent terminal units as the algorithm carrier and a P2P communication network composed of loop Ethernet. It can accurately distinguish the normal state and the failure state based on the generalized Kirchhoff Current Law setting and realize the failure location and isolation without the delay setting problem of the three-stage current protection. In order to verify its effectiveness, a 0.4 kV dynamic simulation model was developed, and scenarios including different types of switches and different topologies are established. The experimental results show that, unlike other algorithms, such as building a convex model, then, using various intelligent algorithms to solve it, the proposed method can complete the load transfer more quickly, whether switches are all circuit breakers, or partly circuit breakers and partly load switches. In the former case, service restoration can be completed within 2.4 s, faster than other centralized or distributed methods, even when the failure occurs in the worst point, as is shown in the results of test scenario 1. In addition, in the latter case, service restoration can be achieved at least within 4.2 s.
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