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In this paper, a state-of-the-art controller architecture for controlling modular multi-level converter (MMC) family is proposed. By using this controller architecture, single point of failure in the power converter, controller board or the communication network does not interrupt the functionality of the system. In order to achieve that, a two-dimensional array of controllers are formed to handle...
A switch-mode power supply (SMPS) converts power efficiently between different voltage levels, making power optimizations through voltage scaling feasible. SMPS controllers are generally dedicated hardware (analog/digital circuits, microcontroller (MCU), digital signal processor (DSP)), and so are expensive to add to very low cost embedded applications. In this work, we show how to integrate SMPS...
This paper proposes a power architecture to utilize doubly-fed induction generator (DFIG) for power generation from oscillating wave energy converter (WEC). Unlike in wind energy conversion system, the stator circuit of the DFIG can not be tied directly with the grid in wave energy conversion system (WECS). In WECS, the speed of the DFIG oscillates from one direction to another. Due to the change...
Embedded peripheral devices are often specified with a range of performance characteristics that are determined by their supply voltage. Recent research explored the benefits of modulating peripheral supply voltage with task-level granularity. With Intra-Operation Dynamic Voltage Scaling (IODVS), we further reduce the energy consumption of peripheral devices by modulating the peripheral supply voltage...
This paper describes the hardware and software architectures and experimental results of a flexible and scalable electric power system (EPS) for CubeSat applications. The EPS has the three flexible battery charging modules (FBCM) to charge the battery and the four flexible digital point of load (FDPOL) converters to drive loads. It uses the maximum power point tracking (MPPT) algorithm to maximize...
Although a data cache provides fast access latency, it degrades the timing predictability of real-time embedded systems due to misses which are difficult to predict. Scratch pad memory is accessed as fast as a data cache, but does not suffer from unpredicted misses thanks to its software-controlled mechanism. This study presents how scratch pad memory reduces data cache pollution and misses for preemptive...
Hardware-managed caches introduce large amounts of timing variability, complicating real-time system design. One alternative is a memory system with scratchpad memories which improve system performance while eliminating such timing variability. Prior work introduced the DARTS approach, which combines static allocation of data into scratchpad memories, with task scheduling for preemptive multi-threaded,...
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