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FRICTION AND WEAR PROPERTIES OF MICRO TEXTURED SURFACES IN BOUNDARY LUBRICATED SLIDING
U. PETTERSSON,S. JACOBSON 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
In the present study, the friction and wear properties of boundary lubricated textured surfaces were investigated. The capability of textured surfaces to feed lubricant into the interface of a sliding contact and to isolate wear particles was studied and related to the properties of the textured surfaces. Well-defined surface textures were produced by lithography and anisotropic etching of silicon wafers. Different widths and distributions of parallel groves were manufactured and subsequently the wafers were PVD coated with thin wear resistant TiN or DLC coatings, retaining the substrate texture. The surfaces were evaluated in reciprocating sliding against a ball bearing steel ball under starved or boundary lubricated conditions.
Practical Implementation of an Interleaved Boost Converter using SiC Diodes for PV Applications
C.N.M. Ho,H. Breuninger,S. Pettersson,G. Escobar,L. Serpa,A. Coccia 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The implementation of an interleaved boost converter using SiC diodes for PV applications is presented in this paper. The converter consists of two switching cells sharing the PV panel output current. Their switching patterns are synchronized with 180 degree phase shift. Each switching cell has a SiC Schottky diode and a CoolMOS switching device. The SiC diodes provide zero reverse recovery current ideally, which reduces the commutation losses of the switches. Such advantage from the SiC diodes can make the converter system achieve higher efficiency and higher power density by reducing the requirement of the cooling system. This paper presents also an optimization study of the size and efficiency of the interleaved boost converter. Based on 1) the steady-state characteristic of the topology, 2) the static and dynamic characteristics of the switching cells, 3) the loss model of the magnetic components and 4) the cooling system design, the paper provides a set of design criteria, procedures and experimental results for a 2.5 ㎾ interleaved boost converter using SiC diodes prototype.
C.N.M. Ho,H. Breuninger,S. Pettersson,G. Escobar,F. Canales 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
A performance comparison of an interleaved boost converter (IBC) using Si and SiC diodes for PV energy conversion systems is presented in this paper. Performance attributes under investigation include the device behavior, thermal requirement, system efficiency and power density. The interleaved boost converter is designed for sustaining the dc link voltage in the energy conversion system. Due to the absence of reverse recovery current in SiC Schottky diodes, low switching loss is generated in the diodes and the switches. This benefit causes higher system efficiency and lower cooling system design requirement. As a benefit, the volume and weight of the heatsink can be further reduced. Furthermore, behaviors of semiconductors and steady-state characteristics of IBC are discussed in the paper. The validity of the analyses is confirmed experimentally by using a 2.5 ㎾ IBC prototype with wide power and input voltage operating range.