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Guipeng Chen,Jie Dong,Yan Deng,Yong Tao,Xiangning He,Yousheng Wang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
This paper presents a family of soft-switching DC–DC converters with a simple auxiliary circuit consisting of a coupled winding and a pair of auxiliary switch and diode. The auxiliary circuit is activated in a short interval and thus the circulating conduction losses are small. With the auxiliary circuit, zero-voltage-switching (ZVS) and zero-current-switching are achieved for the main and auxiliary switches respectively, over wide input voltage range and load variation. In addition, the reverse-recovery problem of diodes is significantly alleviated because of the leakage inductor. Furthermore, the coupled inductor simultaneously serves as the main and auxiliary inductors, contributing to reduced magnetic component in comparison with the conventional zero-voltage-transition (ZVT) converters. Experimental results based on a 500 W prototype buck circuit validate the advantages and effectiveness of the proposed magnetic coupling ZVS converter.
Chen, Guipeng,Dong, Jie,Deng, Yan,Tao, Yong,He, Xiangning,Wang, Yousheng The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
This paper presents a family of soft-switching DC-DC converters with a simple auxiliary circuit consisting of a coupled winding and a pair of auxiliary switch and diode. The auxiliary circuit is activated in a short interval and thus the circulating conduction losses are small. With the auxiliary circuit, zero-voltage-switching (ZVS) and zero-current-switching are achieved for the main and auxiliary switches respectively, over wide input voltage range and load variation. In addition, the reverse-recovery problem of diodes is significantly alleviated because of the leakage inductor. Furthermore, the coupled inductor simultaneously serves as the main and auxiliary inductors, contributing to reduced magnetic component in comparison with the conventional zero-voltage-transition (ZVT) converters. Experimental results based on a 500 W prototype buck circuit validate the advantages and effectiveness of the proposed magnetic coupling ZVS converter.
Yuwei Liu,Guipeng Chen,Liping Mo,Xinlin Qing 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Thanks to the favorable advantage of reduced magnetic components, single-inductor multi-output DC-DC converters are attractive in low-cost industrial applications. However, when the converters work in continuous conduction mode (CCM), a severe dynamic cross-regulation problem will occur due to the current multiplex of the same inductor. To solve this problem, an improved single-inputdual-output (SIDO) buck converter is proposed in this paper, which employs one coupled inductor with 1:1 turns ratio as a substitution for the inductor. In the proposed converter, the two output voltages can be controlled independently while the advantage of fewer magnetic cores is retained. Moreover, reduced number of semiconductor components is achieved, leading to a lower cost. Besides, because of the 1:1 turns ratio, the magnetizing current is also effectively decreased to the one output current rather than the sum of two output currents, which will reduce the volume of magnetic core.
Sen Song,Kai Ni,Guipeng Chen,Yihua Hu,Dongsheng Yu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This study presents a new portable eight-output light emitting diode (LED) driver. The eight output-channels are divided intotwo equal groups, and their output powers can be controlled individually by three active switches. In addition, a simplecapacitor-based passive current balancing circuit (CBC) is employed in each port to guarantee that the currents of the four LEDsare the same. When compared with the conventionally used separate two-output isolated converters, the proposed one uses oneless active switch. Moreover, zero-voltage-switching (ZVS) is achieved, which improves the power efficiency of the driver. Finally, a highly compact prototype is built, which can reach an efficiency of 94.6%.
Song, Sen,Ni, Kai,Chen, Guipeng,Hu, Yihua,Yu, Dongsheng The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This study presents a new portable eight-output light emitting diode (LED) driver. The eight output-channels are divided into two equal groups, and their output powers can be controlled individually by three active switches. In addition, a simple capacitor-based passive current balancing circuit (CBC) is employed in each port to guarantee that the currents of the four LEDs are the same. When compared with the conventionally used separate two-output isolated converters, the proposed one uses one less active switch. Moreover, zero-voltage-switching (ZVS) is achieved, which improves the power efficiency of the driver. Finally, a highly compact prototype is built, which can reach an efficiency of 94.6%.
Yong Tao,Yan Deng,Guangdi Li,Guipeng Chen,Xiangning He 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
The droop-based control strategy is widely applied in the interfacing inverters for distributed generation. This can be a problem since low-frequency stability issues may be encountered in droop-based microgrid. The objective of this paper is to classify, evaluate and compare various low-frequency damping methods. First, low-frequency stability problems are analyzed and an equivalent model of a droop-controlled inverter is investigated to classify the damping methods into the source-type damping strategies and the impedance-type damping strategies. Moreover, the lead-lag compensation network insertion control is proposed as a beneficial part of the source-type damping strategies. Then, the advantages and disadvantages of the different types of damping methods are theoretically evaluated and experimentally tested. Furthermore, the damping methods are comprehensively compared to illustrate the application field of each method. Finally, the synthesis of different damping methods to enhance the low-frequency stability is discussed and experimental validation is presented.
Tao, Yong,Deng, Yan,Li, Guangdi,Chen, Guipeng,He, Xiangning The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
The droop-based control strategy is widely applied in the interfacing inverters for distributed generation. This can be a problem since low-frequency stability issues may be encountered in droop-based microgrid. The objective of this paper is to classify, evaluate and compare various low-frequency damping methods. First, low-frequency stability problems are analyzed and an equivalent model of a droop-controlled inverter is investigated to classify the damping methods into the source-type damping strategies and the impedance-type damping strategies. Moreover, the lead-lag compensation network insertion control is proposed as a beneficial part of the source-type damping strategies. Then, the advantages and disadvantages of the different types of damping methods are theoretically evaluated and experimentally tested. Furthermore, the damping methods are comprehensively compared to illustrate the application field of each method. Finally, the synthesis of different damping methods to enhance the low-frequency stability is discussed and experimental validation is presented.
Design and Manufacture of High Accurate Aerostatic Guideway with Glass Material
Tao Lai,Xiaoqiang Peng,Meng Guo,Guipeng Tie,Chaoliang Guan,Junfeng Liu,Aihua Chen 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.6
Universal materials such as metal and marble are applied for aerostatic guideway. However, metal or marble guideway is usually manufactured by traditional turning and grinding. The corresponding geometric error, load and stiffness of the guideway are limited by the accuracy of traditional manufacture. Glass guideway can be measured by the optical method, thereby improving the performance. This paper presents a guideway designed and manufactured with the K9 glass. The guideway is manufactured by computer controlled optical surfacing and magnetorheological finishing. Moreover, the optical measurement is applied to measure the flatness and the geometric error of the guideway. Besides, the slider on the guideway is designed based on orifice compensated. The working surface error of the guideway is less than 0.1 μm, and the gas film is smaller than traditional aerostatic bearing. Therefore, the load and stiffness of the aerostatic sliders are higher than the traditional slider. Additionally, the effects of configuration and load onto the accuracy of guideway are introduced. The motional geometric error is measured after assembling, with the results that the pitch is better than 0.4 arcsecs and the yaw is better than 0.9 arcsecs. Furthermore, the straightness is compensated at 50 nm/200 mm. At last, the guideway is applied for an ultra-precision profilometer, and a flat is measured by the profilometer, giving 0.1 μm repeatable flatness.
Design and experimental demonstration of coaxially folded all-reflective imaging system
Yupeng Xiong,Yifan Dai,Shanyong Chen,Guipeng Tie 한국광학회 2019 Current Optics and Photonics Vol.3 No.3
With slimmer, lighter and all-reflective imaging systems in high demand for consumer and military applications, coaxially folded optical image systems are widely considered because they can extend focal length and reduce track length. Most of these systems consist of multiple surfaces, and these surfaces are machined on one element or grouping processing on two elements. In this paper, we report and first experimentally demonstrate an all-aluminum all-reflective optical system which consists of two optical elements, with two high order aspherical surfaces in each element. The coaxially folded system is designed with Seidel aberration theory and advanced optimization with Zemax. The system is made of all-aluminum material processing by single point diamond turning (SPDT). On this basis, we completed the system integration and performed an imaging experiment. The final system has the advantages of short track length and long focal length and broad application prospects in the micro-unmanned aerial vehicle field.