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In mission critical power installations, such as data centres, the use of double conversion UPS has been considered the best choice to date for protecting against power quality problems. Indeed, this UPS technology allows for a high level of load protection against any type of electrical disturbance of the network and isolation of the mains against the load's non linear behavior. The cost saving related...
This paper presents the results of inverter development for standalone renewable energy systems used in isolated communities. One of the main problems of such systems, located in isolated areas of difficult access, is the inverters. The mean time before failure of these equipments has been shown smaller than expected. In these applications the inverters should have the following features: expansion...
Conventional droop-control strategy of parallel inverter regulates the phase and the amplitude of the output voltage according to output active power and reactive power respectively. But for a two-loop feedback control voltage-source inverter, active power and reactive power are related to both the amplitude and the phase of the output voltage. In this paper, the equivalent output impedance of the...
The delays of paths in a chip can be monitored to detect via voiding. This work relates the probability of failure of individual vias to an increase in delay for monitors of the system using data for 65 nm technology. The sensitivity of the trigger point as a function of the failure distribution parameters and the path length has been investigated. A circuit has been designed to detect the onset of...
This paper presents a new approach for hardware in the loop testing of voltage source inverters for drive applications. For this purpose the inverter is not connected to a real machine, but to a second power inverter instead, which acts like an electrical machine. Thereby the inverter under test can operate in its normal mode, which in the most of the cases is a field oriented current control with...
This paper proposes the experimental characterization and modeling of thermal runaway phenomena affecting high-voltage devices in the blocking state. In particular, it considers 6.5 kV rated multi-chip IGBT modules, of the kind employed in railway traction applications, showing how temperature and reverse bias voltage influence the off-state power losses and how the same thermal design may yield thermal...
We present a practical, systematical method for the evaluation of the soft error rate (SER) of microelectronic devices. Existing methodologies, practices and tools are integrated in a common approach while highlighting the need for specific data or tools. The showcased method is particularly adapted for evaluating the SER of very complex microelectronic devices by engineers confronted to increasingly...
In this paper we present the performance assessment of the first building-integrated, grid-connected PV installation in Brazil. The 2kWp, thin-film a-Si system is fully monitored, and has been operating continuously since 1997. We show performance results over the 10-years period, and discuss reliability issues related to the continuous operation of this distributed energy source in the urban environment...
In deep submicron era, to prevent larger amount of SRAM from more frequently encountered overheating problems and react accordingly for each possible hotspots, multiple ideal run-time temperature sensors must be closely located and response rapidly to secure system reliability while maintaining core frequency. This paper presented a method to extract run-time temperature information from multiple...
A novel current-sharing control scheme is presented for redundant parallel inverters. The control scheme employs the share bus which interconnects all the parallel inverters to transfer synchronous signal and average current signal. Current-sharing of all the parallel modules is realized through distributed average circuit. Average current is subtracted from the output current of each parallel inverter...
A novel digital current sharing scheme for inverters parallel operation is proposed and discussed. The new scheme is based on controller area network (CAN). This scheme eliminates the circumfluence which is produced by the difference of inverters' voltage amplitudes. A key feature of the scheme is that it uses CAN to transmit parameters among inverters. It is important in high reliability inverters...
Critical computer power applications require some form of UPS protection. Achieving very high reliability from the UPS while keeping equipment and operating cost to a minimum is the main goal of all UPS designers. This paper addresses a new inverter design which permits the solid-state UPS to remain in an off-line mode and only operate during a utility power failure. The paper traces the redevelopment...
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