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Thin film copper membranes on silicon substrates were constructed using micromachining techniques. Membranes were used as flexible ground planes beneath a microstrip transmission line. Actuation of membranes induced phase shift in the transmitted signal. Membranes possessed radial surface corrugations 10 μm deep to increase their flexibility. Membranes were released using a combination of KOH and...
Advancement in technology is very well reflected and supported by changes in measurement and control instrumentation. To move to high-speed serial from Parallel bus architectures has become prevalent and among these Ethernet is the most preferred switched Serial bus, which is forward-looking and backward-compatible. Great stride have been made in promoting Ethernet use for industrial networks and...
This paper presents a survey on existing methods for fault diagnosis and protection of IGBT's, with special focus on those used in three-phase power inverters. Twenty one methods for open-circuit faults and ten methods for short-circuit faults are evaluated and summarized, based on their performance and implementation efforts. The gate-misfiring faults and their diagnostic methods are also briefly...
This paper describes a setup to determine the temperature coefficient of standards inductors. Proposed method is based on Transformer Ratio Bridge and difference voltage measurement technique. The temperature coefficient of three inductors of value 1 mH (GR 1482) was measured by this method in the temperature range of 22degC to 27degC, which lies between 42 to 47 ppm/ degC with deviation of plusmn...
Fault diagnostics of power converters have drawn increasing attentions due to the widespread adoption of advanced power control devices, such as motor drives and uninterruptible power supplies. This paper presents a literature survey on existing methods for fault diagnosis and protection of IGBTpsilas, with special focus on those used in three-phase power inverters. Eleven methods for open-circuit...
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