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SILICON DIRECT BONDING (SDB) WITH HYDROPHOBIC SURFACE TREATMENTS
Wang Haijun,Qian Zhaoming 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Silicon wafers with hydrophobia surfaces have been successfully bonded in our lab with good mechanical and electrical properties at the bonded interfaces. Based on the chemical properties of HF acid and the chemical reaction during hydrophobic treatment, a provisional mechanism of SDB with hydrophobic surface is proposed and discussed. We conclude that the fluor is the main linking atom between bonded silicon atoms.
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Design and optimization of a wide output voltage range LED driver based on LLC resonant topology
Yue Chen,Xinke Wu,Zhaoming Qian,Wenping Zhang 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
LLC resonant converter is an excellent candidate for medium power DC/DC converter. However, it is usually used in constant voltage output application. As for the DC/DC stage in high efficiency LED driver, the output voltage may vary widely while output current remains constant. This paper proposes a new design method which is suitable for wide output range application. Design process, analysis and optimization of design parameters are also discussed in detail. A 140W experimental prototype is built to verify the design and proved a high efficiency after optimization. Experimental result shows LLC is a good topology choice for LED driver for it is highly efficient throughout wide output voltage range.
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Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers
Zhang, Junming,Yuan, Wei,Zeng, Hulong,Qian, Zhaoming The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.6
The winding loss analysis of a flyback transformer is difficult and ambiguous because the primary side current and the secondary side current differs both in shape and phase, especially for DCM (Discontinuous Conduction Mode) operation. Meanwhile, the fringing field caused by the air gaps further makes the traditional 1-D loss analysis model not directly applicable. The paper gives a thorough investigation into the phase shift of winding currents, which indicates that the phase shift of the high order harmonics is still close to $180^{\circ}$ out-of-phase. Based on the analysis, a simplified 2-D winding loss analytical model for flyback transformers considering the effects of low order harmonics is proposed. By neglecting the y components of the fringing field, the proposed model has an acceptable accuracy and a simple form that is similar to the conventional 1-D model. The power loss calculated with the proposed analysis model is verified by FEA (Finite Element Analysis) simulations and experimental results.
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Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers
Junming Zhang,Wei Yuan,Hulong Zeng,Zhaoming Qian 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.6
The winding loss analysis of a flyback transformer is difficult and ambiguous because the primary side current and the secondary side current differs both in shape and phase, especially for DCM (Discontinuous Conduction Mode) operation. Meanwhile, the fringing field caused by the air gaps further makes the traditional 1-D loss analysis model not directly applicable. The paper gives a thorough investigation into the phase shift of winding currents, which indicates that the phase shift of the high order harmonics is still close to 180º out-of-phase. Based on the analysis, a simplified 2-D winding loss analytical model for flyback transformers considering the effects of low order harmonics is proposed. By neglecting the y components of the fringing field, the proposed model has an acceptable accuracy and a simple form that is similar to the conventional 1-D model. The power loss calculated with the proposed analysis model is verified by FEA (Finite Element Analysis) simulations and experimental results.
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