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In PV systems, DC-DC converters have been identified a s o ne o f t he m ost c ritical a nd c hallenging subsystem in terms of failure rate. Thus, this paper proposes fault tolerant operation of a two-stage Buck/Buck-Boost converter under open-circuit switch failure. Remedial actions are efficient in any failure of one of the two switches of the converter. Here, a new unified approach is considered, for the overall fault tolerant operation of the two stages of the converter. The fault tolerant circuit we propose lies on performing redundancy by implementing the equivalent synchronous switch for the two main switches of the two stages, in offline m ode. T he f ault t olerant c ircuit results from the basic two-stage Buck/Buck-Boost converter and its equivalent circuit with a synchronous switch, merged together to form the new DC-DC fault tolerant circuit.Therefore, post-fault operation at full power can also be performed. By using a switch fault management unit with reduced complexity, inserted between the control block and the switches, we have designed an unified, e fficient and optimized fault tolerant control, suitable in both healthy and post-fault operations. Some selected experimental tests, which all confirm t he g ood p erformances o f t he proposed fault tolerant approach, are presented and discussed.

In this article, we present CuNoC, a new paradigm for intercommunication between modules dynamically placed on a chip for FPGA-based reconfigurable devices. The CuNoC is based on scalable communication unit called CU which allows the simultaneous communication between several processing elements placed on the chip. We present the basic concept of this communication approach, its main advantages and drawbacks with regards to the other main NoC approaches already proposed.

In this paper, we present a new deadlock-free fault-tolerant adaptive routing algorithm for the 2D mesh NoC interconnections. The main contribution of this routing algorithm is that it allows both, routing of messages in the networks incorporating the regions not necessarily rectangular, and routing to all nodes which are not completely blocked by faulty nodes. The proposed routing algorithm is based on a modified turn model and well known XY algorithm. We detail the basic principle of this routing algorithm, prove its deadlock freeness, its feasibility and efficiency through the simulation results.