Undergraduate student experience in development of ZVS power converter for voltage control with low cost microcontroller

Author(s):  
Shamsul Aizam Zulkifli ◽  
Fatin Nur Fasya Ramli ◽  
Syazwan Razali
Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 958
Author(s):  
Maosheng Zhang ◽  
Yu Bai ◽  
Shu Yang ◽  
Kuang Sheng

With the increasing integration density of power control unit (PCU) modules, more functional power converter units are integrated into a single module for applications in electric vehicles or hybrid electric vehicles (EVs/HEVs). Different types of power dies with different footprints are usually placed closely together. Due to the constraints from the placement of power dies and liquid cooling schemes, heat-flow paths from the junction to coolant are possibly inconsistent for power dies, resulting in different thermal resistance and capacitance (RC) characteristics of power dies. This presents a critical challenge for optimal liquid cooling at a low cost. In this paper, a highly integrated PCU module is developed for application in EVs/HEVs. The underlying mechanism of the inconsistent RC characteristics of power dies for the developed PCU module is revealed by experiments and simulations. It is found that the matching placement design of power dies with a heat sink structure and liquid cooler, as well as a liquid cooling scheme, can alleviate the inconsistent RC characteristics of power dies in highly integrated PCU modules. The findings in this paper provide valuable guidance for the design of highly integrated PCU modules.


Author(s):  
Paul A. Temple ◽  
Claire Callender ◽  
Lyn Grove ◽  
Natasha Kersh

This paper reports on recent research aimed at assessing how the management of the undergraduate student experience in English higher education is changing in the light of the new tuition fee regime introduced in 2012, as well as other government policies aimed at creating market-type pressures within the higher education sector. A distinction was observed between the research-intensive universities studied – defined here as institutions where research income comprised 20 per cent or more of total turnover, with correspondingly strong positions in published research-based rankings – and universities largely dependent on income from teaching, with weaker market positions. Broadly speaking, the latter group were responding to market pressures by centralizing services, standardizing procedures, and strengthening management controls over teaching processes. The research-intensive universities tended to work within existing institutional cultures to respond to students' needs. Organizational change here usually took the form of creating more coherent functional groupings of student services, rather than comprehensive reorganizations. It appears to us that these different responses to a changed environment point to the creation of two distinct English university types, one strongly managerial with 'student as customer' orientations, and a smaller group with less centralized, more collegial cultures.


2009 ◽  
Vol 24 (9) ◽  
pp. 2178-2192 ◽  
Author(s):  
Xibo Yuan ◽  
Fei Wang ◽  
D. Boroyevich ◽  
Yongdong Li ◽  
R. Burgos

2013 ◽  
Vol 2013 (142) ◽  
pp. 49-59
Author(s):  
Melissa S. Shivers ◽  
Sally J. McMillan

Author(s):  
Alexandre Bento ◽  
Sérgio André ◽  
Ricardo Luís ◽  
J. Fernando Silva

The paper presents the design stages of a single-phase Silicon Carbide bidirectional DC-AC converter. This includes the LCL filter design responsible to meet grid connection requirements. A 3kW laboratory prototype of the power converter is built employing a low-cost phase locked loop and its results are presented. The design of the low-cost phase locked loop and its implementation are depicted in some detail.


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